"Shared Brotli" initial commit.
Shared brotli is feature that allows attaching complex
(LZ77 prefix + word-based + transforms) dictionaries for better
compression ratios.
diff --git a/c/common/shared_dictionary.c b/c/common/shared_dictionary.c
new file mode 100755
index 0000000..b0d6e5f
--- /dev/null
+++ b/c/common/shared_dictionary.c
@@ -0,0 +1,507 @@
+#include <brotli/shared_dictionary.h>
+
+#include <memory.h>
+#include <stdio.h>
+
+#include "./dictionary.h"
+#include "./platform.h"
+#include "./shared_dictionary_internal.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#define BROTLI_NUM_ENCODED_LENGTHS (SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH \
+ - SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH + 1)
+
+/* Max allowed by spec */
+#define BROTLI_MAX_SIZE_BITS 15u
+
+/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */
+static BROTLI_BOOL ReadBool(const uint8_t* encoded, size_t size, size_t* pos,
+ BROTLI_BOOL* result) {
+ uint8_t value;
+ size_t position = *pos;
+ if (position >= size) return BROTLI_FALSE; /* past file end */
+ value = encoded[position++];
+ if (value > 1) return BROTLI_FALSE; /* invalid bool */
+ *result = TO_BROTLI_BOOL(value);
+ *pos = position;
+ return BROTLI_TRUE; /* success */
+}
+
+/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */
+static BROTLI_BOOL ReadUint8(const uint8_t* encoded, size_t size, size_t* pos,
+ uint8_t* result) {
+ size_t position = *pos;
+ if (position + sizeof(uint8_t) > size) return BROTLI_FALSE;
+ *result = encoded[position++];
+ *pos = position;
+ return BROTLI_TRUE;
+}
+
+/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */
+static BROTLI_BOOL ReadUint16(const uint8_t* encoded, size_t size, size_t* pos,
+ uint16_t* result) {
+ size_t position = *pos;
+ if (position + sizeof(uint16_t) > size) return BROTLI_FALSE;
+ *result = BROTLI_UNALIGNED_LOAD16LE(&encoded[position]);
+ position += 2;
+ *pos = position;
+ return BROTLI_TRUE;
+}
+
+/* Reads a varint into a uint32_t, and returns error if it's too large */
+/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */
+static BROTLI_BOOL ReadVarint32(const uint8_t* encoded, size_t size,
+ size_t* pos, uint32_t* result) {
+ int num = 0;
+ uint8_t byte;
+ *result = 0;
+ for (;;) {
+ if (*pos >= size) return BROTLI_FALSE;
+ byte = encoded[(*pos)++];
+ if (num == 4 && byte > 15) return BROTLI_FALSE;
+ *result |= (uint32_t)(byte & 127) << (num * 7);
+ if (byte < 128) return BROTLI_TRUE;
+ num++;
+ }
+}
+
+/* Returns the total length of word list. */
+static size_t BrotliSizeBitsToOffsets(const uint8_t* size_bits_by_length,
+ uint32_t* offsets_by_length) {
+ uint32_t pos = 0;
+ uint32_t i;
+ for (i = 0; i <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH; i++) {
+ offsets_by_length[i] = pos;
+ if (size_bits_by_length[i] != 0) {
+ pos += i << size_bits_by_length[i];
+ }
+ }
+ return pos;
+}
+
+static BROTLI_BOOL ParseWordList(size_t size, const uint8_t* encoded,
+ size_t* pos, BrotliDictionary* out) {
+ size_t offset;
+ size_t i;
+ size_t position = *pos;
+ if (position + BROTLI_NUM_ENCODED_LENGTHS > size) {
+ return BROTLI_FALSE;
+ }
+
+ memset(out->size_bits_by_length, 0, SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH);
+ memcpy(out->size_bits_by_length + SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH,
+ &encoded[position], BROTLI_NUM_ENCODED_LENGTHS);
+ for (i = SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH;
+ i <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH; i++) {
+ if (out->size_bits_by_length[i] > BROTLI_MAX_SIZE_BITS) {
+ return BROTLI_FALSE;
+ }
+ }
+ position += BROTLI_NUM_ENCODED_LENGTHS;
+ offset = BrotliSizeBitsToOffsets(
+ out->size_bits_by_length, out->offsets_by_length);
+
+ out->data = &encoded[position];
+ out->data_size = offset;
+ position += offset;
+ if (position > size) return BROTLI_FALSE;
+ *pos = position;
+ return BROTLI_TRUE;
+}
+
+/* Computes the cutOffTransforms of a BrotliTransforms which already has the
+ transforms data correctly filled in. */
+static void ComputeCutoffTransforms(BrotliTransforms* transforms) {
+ uint32_t i;
+ for (i = 0; i < BROTLI_TRANSFORMS_MAX_CUT_OFF + 1; i++) {
+ transforms->cutOffTransforms[i] = -1;
+ }
+ for (i = 0; i < transforms->num_transforms; i++) {
+ const uint8_t* prefix = BROTLI_TRANSFORM_PREFIX(transforms, i);
+ uint8_t type = BROTLI_TRANSFORM_TYPE(transforms, i);
+ const uint8_t* suffix = BROTLI_TRANSFORM_SUFFIX(transforms, i);
+ if (type <= BROTLI_TRANSFORM_OMIT_LAST_9 && *prefix == 0 && *suffix == 0 &&
+ transforms->cutOffTransforms[type] == -1) {
+ transforms->cutOffTransforms[type] = (int16_t)i;
+ }
+ }
+}
+
+static BROTLI_BOOL ParsePrefixSuffixTable(size_t size, const uint8_t* encoded,
+ size_t* pos, BrotliTransforms* out, uint16_t* out_table,
+ size_t* out_table_size) {
+ size_t position = *pos;
+ size_t offset = 0;
+ size_t stringlet_count = 0; /* NUM_PREFIX_SUFFIX */
+ size_t data_length = 0;
+
+ /* PREFIX_SUFFIX_LENGTH */
+ if (!ReadUint16(encoded, size, &position, &out->prefix_suffix_size)) {
+ return BROTLI_FALSE;
+ }
+ data_length = out->prefix_suffix_size;
+
+ /* Must at least have space for null terminator. */
+ if (data_length < 1) return BROTLI_FALSE;
+ out->prefix_suffix = &encoded[position];
+ if (position + data_length >= size) return BROTLI_FALSE;
+ while (BROTLI_TRUE) {
+ /* STRING_LENGTH */
+ size_t stringlet_len = encoded[position + offset];
+ out_table[stringlet_count] = (uint16_t)offset;
+ stringlet_count++;
+ offset++;
+ if (stringlet_len == 0) {
+ if (offset == data_length) {
+ break;
+ } else {
+ return BROTLI_FALSE;
+ }
+ }
+ if (stringlet_count > 255) return BROTLI_FALSE;
+ offset += stringlet_len;
+ if (offset >= data_length) return BROTLI_FALSE;
+ }
+
+ position += data_length;
+ *pos = position;
+ *out_table_size = (uint16_t)stringlet_count;
+ return BROTLI_TRUE;
+}
+
+static BROTLI_BOOL ParseTransformsList(size_t size, const uint8_t* encoded,
+ size_t* pos, BrotliTransforms* out, uint16_t* prefix_suffix_table,
+ size_t* prefix_suffix_count) {
+ uint32_t i;
+ BROTLI_BOOL has_params = BROTLI_FALSE;
+ BROTLI_BOOL prefix_suffix_ok = BROTLI_FALSE;
+ size_t position = *pos;
+ size_t stringlet_cnt = 0;
+ if (position >= size) return BROTLI_FALSE;
+
+ prefix_suffix_ok = ParsePrefixSuffixTable(
+ size, encoded, &position, out, prefix_suffix_table, &stringlet_cnt);
+ if (!prefix_suffix_ok) return BROTLI_FALSE;
+ out->prefix_suffix_map = prefix_suffix_table;
+ *prefix_suffix_count = stringlet_cnt;
+
+ out->num_transforms = encoded[position++];
+ out->transforms = &encoded[position];
+ position += (size_t)out->num_transforms * 3;
+ if (position > size) return BROTLI_FALSE;
+ /* Check for errors and read extra parameters. */
+ for (i = 0; i < out->num_transforms; i++) {
+ uint8_t prefix_id = BROTLI_TRANSFORM_PREFIX_ID(out, i);
+ uint8_t type = BROTLI_TRANSFORM_TYPE(out, i);
+ uint8_t suffix_id = BROTLI_TRANSFORM_SUFFIX_ID(out, i);
+ if (prefix_id >= stringlet_cnt) return BROTLI_FALSE;
+ if (type >= BROTLI_NUM_TRANSFORM_TYPES) return BROTLI_FALSE;
+ if (suffix_id >= stringlet_cnt) return BROTLI_FALSE;
+ if (type == BROTLI_TRANSFORM_SHIFT_FIRST ||
+ type == BROTLI_TRANSFORM_SHIFT_ALL) {
+ has_params = BROTLI_TRUE;
+ }
+ }
+ if (has_params) {
+ out->params = &encoded[position];
+ position += (size_t)out->num_transforms * 2;
+ if (position > size) return BROTLI_FALSE;
+ for (i = 0; i < out->num_transforms; i++) {
+ uint8_t type = BROTLI_TRANSFORM_TYPE(out, i);
+ if (type != BROTLI_TRANSFORM_SHIFT_FIRST &&
+ type != BROTLI_TRANSFORM_SHIFT_ALL) {
+ if (out->params[i * 2] != 0 || out->params[i * 2 + 1] != 0) {
+ return BROTLI_FALSE;
+ }
+ }
+ }
+ } else {
+ out->params = NULL;
+ }
+ ComputeCutoffTransforms(out);
+ *pos = position;
+ return BROTLI_TRUE;
+}
+
+static BROTLI_BOOL DryParseDictionary(const uint8_t* encoded,
+ size_t size, uint32_t* num_prefix, BROTLI_BOOL* is_custom_static_dict) {
+ size_t pos = 0;
+ uint32_t chunk_size = 0;
+ uint8_t num_word_lists;
+ uint8_t num_transform_lists;
+ *is_custom_static_dict = BROTLI_FALSE;
+ *num_prefix = 0;
+
+ /* Skip magic header bytes. */
+ pos += 2;
+
+ /* LZ77_DICTIONARY_LENGTH */
+ if (!ReadVarint32(encoded, size, &pos, &chunk_size)) return BROTLI_FALSE;
+ if (chunk_size != 0) {
+ /* This limitation is not specified but the 32-bit Brotli decoder for now */
+ if (chunk_size > 1073741823) return BROTLI_FALSE;
+ *num_prefix = 1;
+ if (pos + chunk_size > size) return BROTLI_FALSE;
+ pos += chunk_size;
+ }
+
+ if (!ReadUint8(encoded, size, &pos, &num_word_lists)) {
+ return BROTLI_FALSE;
+ }
+ if (!ReadUint8(encoded, size, &pos, &num_transform_lists)) {
+ return BROTLI_FALSE;
+ }
+
+ if (num_word_lists > 0 || num_transform_lists > 0) {
+ *is_custom_static_dict = BROTLI_TRUE;
+ }
+
+ return BROTLI_TRUE;
+}
+
+static BROTLI_BOOL ParseDictionary(const uint8_t* encoded, size_t size,
+ BrotliSharedDictionary* dict) {
+ uint32_t i;
+ size_t pos = 0;
+ uint32_t chunk_size = 0;
+ size_t total_prefix_suffix_count = 0;
+ size_t trasform_list_start[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
+ uint16_t temporary_prefix_suffix_table[256];
+
+ /* Skip magic header bytes. */
+ pos += 2;
+
+ /* LZ77_DICTIONARY_LENGTH */
+ if (!ReadVarint32(encoded, size, &pos, &chunk_size)) return BROTLI_FALSE;
+ if (chunk_size != 0) {
+ if (pos + chunk_size > size) return BROTLI_FALSE;
+ dict->prefix_size[dict->num_prefix] = chunk_size;
+ dict->prefix[dict->num_prefix] = &encoded[pos];
+ dict->num_prefix++;
+ /* LZ77_DICTIONARY_LENGTH bytes. */
+ pos += chunk_size;
+ }
+
+ /* NUM_WORD_LISTS */
+ if (!ReadUint8(encoded, size, &pos, &dict->num_word_lists)) {
+ return BROTLI_FALSE;
+ }
+ if (dict->num_word_lists > SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS) {
+ return BROTLI_FALSE;
+ }
+
+ if (dict->num_word_lists != 0) {
+ dict->words_instances = (BrotliDictionary*)dict->alloc_func(
+ dict->memory_manager_opaque,
+ dict->num_word_lists * sizeof(*dict->words_instances));
+ if (!dict->words_instances) return BROTLI_FALSE; /* OOM */
+ }
+ for (i = 0; i < dict->num_word_lists; i++) {
+ if (!ParseWordList(size, encoded, &pos, &dict->words_instances[i])) {
+ return BROTLI_FALSE;
+ }
+ }
+
+ /* NUM_TRANSFORM_LISTS */
+ if (!ReadUint8(encoded, size, &pos, &dict->num_transform_lists)) {
+ return BROTLI_FALSE;
+ }
+ if (dict->num_transform_lists > SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS) {
+ return BROTLI_FALSE;
+ }
+
+
+ if (dict->num_transform_lists != 0) {
+ dict->transforms_instances = (BrotliTransforms*)dict->alloc_func(
+ dict->memory_manager_opaque,
+ dict->num_transform_lists * sizeof(*dict->transforms_instances));
+ if (!dict->transforms_instances) return BROTLI_FALSE; /* OOM */
+ }
+ for (i = 0; i < dict->num_transform_lists; i++) {
+ BROTLI_BOOL ok = BROTLI_FALSE;
+ size_t prefix_suffix_count = 0;
+ trasform_list_start[i] = pos;
+ dict->transforms_instances[i].prefix_suffix_map =
+ temporary_prefix_suffix_table;
+ ok = ParseTransformsList(
+ size, encoded, &pos, &dict->transforms_instances[i],
+ temporary_prefix_suffix_table, &prefix_suffix_count);
+ if (!ok) return BROTLI_FALSE;
+ total_prefix_suffix_count += prefix_suffix_count;
+ }
+ if (total_prefix_suffix_count != 0) {
+ dict->prefix_suffix_maps = (uint16_t*)dict->alloc_func(
+ dict->memory_manager_opaque,
+ total_prefix_suffix_count * sizeof(*dict->prefix_suffix_maps));
+ if (!dict->prefix_suffix_maps) return BROTLI_FALSE; /* OOM */
+ }
+ total_prefix_suffix_count = 0;
+ for (i = 0; i < dict->num_transform_lists; i++) {
+ size_t prefix_suffix_count = 0;
+ size_t position = trasform_list_start[i];
+ uint16_t* prefix_suffix_map =
+ &dict->prefix_suffix_maps[total_prefix_suffix_count];
+ BROTLI_BOOL ok = ParsePrefixSuffixTable(
+ size, encoded, &position, &dict->transforms_instances[i],
+ prefix_suffix_map, &prefix_suffix_count);
+ if (!ok) return BROTLI_FALSE;
+ dict->transforms_instances[i].prefix_suffix_map = prefix_suffix_map;
+ total_prefix_suffix_count += prefix_suffix_count;
+ }
+
+ if (dict->num_word_lists != 0 || dict->num_transform_lists != 0) {
+ if (!ReadUint8(encoded, size, &pos, &dict->num_dictionaries)) {
+ return BROTLI_FALSE;
+ }
+ if (dict->num_dictionaries == 0 ||
+ dict->num_dictionaries > SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS) {
+ return BROTLI_FALSE;
+ }
+ for (i = 0; i < dict->num_dictionaries; i++) {
+ uint8_t words_index;
+ uint8_t transforms_index;
+ if (!ReadUint8(encoded, size, &pos, &words_index)) {
+ return BROTLI_FALSE;
+ }
+ if (words_index > dict->num_word_lists) return BROTLI_FALSE;
+ if (!ReadUint8(encoded, size, &pos, &transforms_index)) {
+ return BROTLI_FALSE;
+ }
+ if (transforms_index > dict->num_transform_lists) return BROTLI_FALSE;
+ dict->words[i] = words_index == dict->num_word_lists ?
+ BrotliGetDictionary() : &dict->words_instances[words_index];
+ dict->transforms[i] = transforms_index == dict->num_transform_lists ?
+ BrotliGetTransforms(): &dict->transforms_instances[transforms_index];
+ }
+ /* CONTEXT_ENABLED */
+ if (!ReadBool(encoded, size, &pos, &dict->context_based)) {
+ return BROTLI_FALSE;
+ }
+
+ /* CONTEXT_MAP */
+ if (dict->context_based) {
+ for (i = 0; i < SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS; i++) {
+ if (!ReadUint8(encoded, size, &pos, &dict->context_map[i])) {
+ return BROTLI_FALSE;
+ }
+ if (dict->context_map[i] >= dict->num_dictionaries) {
+ return BROTLI_FALSE;
+ }
+ }
+ }
+ } else {
+ dict->context_based = BROTLI_FALSE;
+ dict->num_dictionaries = 1;
+ dict->words[0] = BrotliGetDictionary();
+ dict->transforms[0] = BrotliGetTransforms();
+ }
+
+ return BROTLI_TRUE;
+}
+
+/* Decodes shared dictionary and verifies correctness.
+ Returns BROTLI_TRUE if dictionary is valid, BROTLI_FALSE otherwise.
+ The BrotliSharedDictionary must already have been initialized. If the
+ BrotliSharedDictionary already contains data, compound dictionaries
+ will be appended, but an error will be returned if it already has
+ custom words or transforms.
+ TODO: link to RFC for shared brotli once published. */
+static BROTLI_BOOL DecodeSharedDictionary(
+ const uint8_t* encoded, size_t size, BrotliSharedDictionary* dict) {
+ uint32_t num_prefix = 0;
+ BROTLI_BOOL is_custom_static_dict = BROTLI_FALSE;
+ BROTLI_BOOL has_custom_static_dict =
+ dict->num_word_lists > 0 || dict->num_transform_lists > 0;
+
+ /* Check magic header bytes. */
+ if (size < 2) return BROTLI_FALSE;
+ if (encoded[0] != 0x91 || encoded[1] != 0) return BROTLI_FALSE;
+
+ if (!DryParseDictionary(encoded, size, &num_prefix, &is_custom_static_dict)) {
+ return BROTLI_FALSE;
+ }
+
+ if (num_prefix + dict->num_prefix > SHARED_BROTLI_MAX_COMPOUND_DICTS) {
+ return BROTLI_FALSE;
+ }
+
+ /* Cannot combine different static dictionaries, only prefix dictionaries */
+ if (has_custom_static_dict && is_custom_static_dict) return BROTLI_FALSE;
+
+ return ParseDictionary(encoded, size, dict);
+}
+
+void BrotliSharedDictionaryDestroyInstance(
+ BrotliSharedDictionary* dict) {
+ if (!dict) {
+ return;
+ } else {
+ brotli_free_func free_func = dict->free_func;
+ void* opaque = dict->memory_manager_opaque;
+ /* Cleanup. */
+ free_func(opaque, dict->words_instances);
+ free_func(opaque, dict->transforms_instances);
+ free_func(opaque, dict->prefix_suffix_maps);
+ /* Self-destruction. */
+ free_func(opaque, dict);
+ }
+}
+
+BROTLI_BOOL BrotliSharedDictionaryAttach(
+ BrotliSharedDictionary* dict, BrotliSharedDictionaryType type,
+ const uint8_t* data, size_t size) {
+ if (!dict) {
+ return BROTLI_FALSE;
+ }
+ if (type == BROTLI_SHARED_DICTIONARY_SERIALIZED) {
+ return DecodeSharedDictionary(data, size, dict);
+ } else if (type == BROTLI_SHARED_DICTIONARY_RAW) {
+ if (dict->num_prefix >= SHARED_BROTLI_MAX_COMPOUND_DICTS) {
+ return BROTLI_FALSE;
+ }
+ dict->prefix_size[dict->num_prefix] = size;
+ dict->prefix[dict->num_prefix] = data;
+ dict->num_prefix++;
+ return BROTLI_TRUE;
+ } else {
+ return BROTLI_FALSE;
+ }
+}
+
+BrotliSharedDictionary* BrotliSharedDictionaryCreateInstance(
+ brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) {
+ BrotliSharedDictionary* dict = 0;
+ if (!alloc_func && !free_func) {
+ dict = (BrotliSharedDictionary*)malloc(sizeof(BrotliSharedDictionary));
+ } else if (alloc_func && free_func) {
+ dict = (BrotliSharedDictionary*)alloc_func(
+ opaque, sizeof(BrotliSharedDictionary));
+ }
+ if (dict == 0) {
+ return 0;
+ }
+
+ /* TODO: explicitly initialize all the fields? */
+ memset(dict, 0, sizeof(BrotliSharedDictionary));
+
+ dict->context_based = BROTLI_FALSE;
+ dict->num_dictionaries = 1;
+ dict->num_word_lists = 0;
+ dict->num_transform_lists = 0;
+
+ dict->words[0] = BrotliGetDictionary();
+ dict->transforms[0] = BrotliGetTransforms();
+
+ dict->alloc_func = alloc_func ? alloc_func : BrotliDefaultAllocFunc;
+ dict->free_func = free_func ? free_func : BrotliDefaultFreeFunc;
+ dict->memory_manager_opaque = opaque;
+
+ return dict;
+}
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} /* extern "C" */
+#endif
diff --git a/c/common/shared_dictionary_internal.h b/c/common/shared_dictionary_internal.h
new file mode 100755
index 0000000..a10dff8
--- /dev/null
+++ b/c/common/shared_dictionary_internal.h
@@ -0,0 +1,66 @@
+#ifndef BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_
+#define BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_
+
+#include "./dictionary.h"
+#include <brotli/shared_dictionary.h>
+#include "./transform.h"
+#include <brotli/types.h>
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+struct BrotliSharedDictionaryStruct {
+ /* LZ77 prefixes (compound dictionary). */
+ uint32_t num_prefix; /* max SHARED_BROTLI_MAX_COMPOUND_DICTS */
+ size_t prefix_size[SHARED_BROTLI_MAX_COMPOUND_DICTS];
+ const uint8_t* prefix[SHARED_BROTLI_MAX_COMPOUND_DICTS];
+
+ /* If set, the context map is used to select word and transform list from 64
+ contexts, if not set, the context map is not used and only words[0] and
+ transforms[0] are to be used. */
+ BROTLI_BOOL context_based;
+
+ uint8_t context_map[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
+
+ /* Amount of word_list+transform_list combinations. */
+ uint8_t num_dictionaries;
+
+ /* Must use num_dictionaries values. */
+ const BrotliDictionary* words[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
+
+ /* Must use num_dictionaries values. */
+ const BrotliTransforms* transforms[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
+
+ /* Amount of custom word lists. May be 0 if only Brotli's built-in is used */
+ uint8_t num_word_lists;
+
+ /* Contents of the custom words lists. Must be NULL if num_word_lists is 0. */
+ BrotliDictionary* words_instances;
+
+ /* Amount of custom transform lists. May be 0 if only Brotli's built-in is
+ used */
+ uint8_t num_transform_lists;
+
+ /* Contents of the custom transform lists. Must be NULL if num_transform_lists
+ is 0. */
+ BrotliTransforms* transforms_instances;
+
+ /* Concatenated prefix_suffix_maps of the custom transform lists. Must be NULL
+ if num_transform_lists is 0. */
+ uint16_t* prefix_suffix_maps;
+
+ /* Memory management */
+ brotli_alloc_func alloc_func;
+ brotli_free_func free_func;
+ void* memory_manager_opaque;
+};
+
+typedef struct BrotliSharedDictionaryStruct BrotliSharedDictionaryInternal;
+#define BrotliSharedDictionary BrotliSharedDictionaryInternal
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} /* extern "C" */
+#endif
+
+#endif /* BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_ */
diff --git a/c/common/transform.c b/c/common/transform.c
index 4184ae5..8a4478d 100755
--- a/c/common/transform.c
+++ b/c/common/transform.c
@@ -166,6 +166,7 @@
kPrefixSuffixMap,
sizeof(kTransformsData) / (3 * sizeof(kTransformsData[0])),
kTransformsData,
+ NULL, /* no extra parameters */
{0, 12, 27, 23, 42, 63, 56, 48, 59, 64}
};
@@ -190,6 +191,48 @@
return 3;
}
+static int Shift(uint8_t* word, int word_len, uint16_t parameter) {
+ /* Limited sign extension: scalar < (1 << 24). */
+ uint32_t scalar =
+ (parameter & 0x7FFFu) + (0x1000000u - (parameter & 0x8000u));
+ if (word[0] < 0x80) {
+ /* 1-byte rune / 0sssssss / 7 bit scalar (ASCII). */
+ scalar += (uint32_t)word[0];
+ word[0] = (uint8_t)(scalar & 0x7Fu);
+ return 1;
+ } else if (word[0] < 0xC0) {
+ /* Continuation / 10AAAAAA. */
+ return 1;
+ } else if (word[0] < 0xE0) {
+ /* 2-byte rune / 110sssss AAssssss / 11 bit scalar. */
+ if (word_len < 2) return 1;
+ scalar += (uint32_t)((word[1] & 0x3Fu) | ((word[0] & 0x1Fu) << 6u));
+ word[0] = (uint8_t)(0xC0 | ((scalar >> 6u) & 0x1F));
+ word[1] = (uint8_t)((word[1] & 0xC0) | (scalar & 0x3F));
+ return 2;
+ } else if (word[0] < 0xF0) {
+ /* 3-byte rune / 1110ssss AAssssss BBssssss / 16 bit scalar. */
+ if (word_len < 3) return word_len;
+ scalar += (uint32_t)((word[2] & 0x3Fu) | ((word[1] & 0x3Fu) << 6u) |
+ ((word[0] & 0x0Fu) << 12u));
+ word[0] = (uint8_t)(0xE0 | ((scalar >> 12u) & 0x0F));
+ word[1] = (uint8_t)((word[1] & 0xC0) | ((scalar >> 6u) & 0x3F));
+ word[2] = (uint8_t)((word[2] & 0xC0) | (scalar & 0x3F));
+ return 3;
+ } else if (word[0] < 0xF8) {
+ /* 4-byte rune / 11110sss AAssssss BBssssss CCssssss / 21 bit scalar. */
+ if (word_len < 4) return word_len;
+ scalar += (uint32_t)((word[3] & 0x3Fu) | ((word[2] & 0x3Fu) << 6u) |
+ ((word[1] & 0x3Fu) << 12u) | ((word[0] & 0x07u) << 18u));
+ word[0] = (uint8_t)(0xF0 | ((scalar >> 18u) & 0x07));
+ word[1] = (uint8_t)((word[1] & 0xC0) | ((scalar >> 12u) & 0x3F));
+ word[2] = (uint8_t)((word[2] & 0xC0) | ((scalar >> 6u) & 0x3F));
+ word[3] = (uint8_t)((word[3] & 0xC0) | (scalar & 0x3F));
+ return 4;
+ }
+ return 1;
+}
+
int BrotliTransformDictionaryWord(uint8_t* dst, const uint8_t* word, int len,
const BrotliTransforms* transforms, int transfom_idx) {
int idx = 0;
@@ -221,6 +264,19 @@
uppercase += step;
len -= step;
}
+ } else if (t == BROTLI_TRANSFORM_SHIFT_FIRST) {
+ uint16_t param = (uint16_t)(transforms->params[transfom_idx * 2]
+ + (transforms->params[transfom_idx * 2 + 1] << 8u));
+ Shift(&dst[idx - len], len, param);
+ } else if (t == BROTLI_TRANSFORM_SHIFT_ALL) {
+ uint16_t param = (uint16_t)(transforms->params[transfom_idx * 2]
+ + (transforms->params[transfom_idx * 2 + 1] << 8u));
+ uint8_t* shift = &dst[idx - len];
+ while (len > 0) {
+ int step = Shift(shift, len, param);
+ shift += step;
+ len -= step;
+ }
}
}
{
diff --git a/c/common/transform.h b/c/common/transform.h
index 456c12d..b6f86cc 100755
--- a/c/common/transform.h
+++ b/c/common/transform.h
@@ -37,6 +37,8 @@
BROTLI_TRANSFORM_OMIT_FIRST_7 = 18,
BROTLI_TRANSFORM_OMIT_FIRST_8 = 19,
BROTLI_TRANSFORM_OMIT_FIRST_9 = 20,
+ BROTLI_TRANSFORM_SHIFT_FIRST = 21,
+ BROTLI_TRANSFORM_SHIFT_ALL = 22,
BROTLI_NUM_TRANSFORM_TYPES /* Counts transforms, not a transform itself. */
};
@@ -50,6 +52,9 @@
uint32_t num_transforms;
/* Each entry is a [prefix_id, transform, suffix_id] triplet. */
const uint8_t* transforms;
+ /* Shift for BROTLI_TRANSFORM_SHIFT_FIRST and BROTLI_TRANSFORM_SHIFT_ALL,
+ must be NULL if and only if no such transforms are present. */
+ const uint8_t* params;
/* Indices of transforms like ["", BROTLI_TRANSFORM_OMIT_LAST_#, ""].
0-th element corresponds to ["", BROTLI_TRANSFORM_IDENTITY, ""].
-1, if cut-off transform does not exist. */
diff --git a/c/dec/decode.c b/c/dec/decode.c
index 674b829..3b4acae 100644
--- a/c/dec/decode.c
+++ b/c/dec/decode.c
@@ -17,6 +17,7 @@
#include "../common/context.h"
#include "../common/dictionary.h"
#include "../common/platform.h"
+#include "../common/shared_dictionary_internal.h"
#include "../common/transform.h"
#include "../common/version.h"
#include "./bit_reader.h"
@@ -1384,6 +1385,142 @@
BROTLI_DCHECK(0); /* Unreachable */
}
+static BROTLI_BOOL AttachCompoundDictionary(
+ BrotliDecoderState* state, const uint8_t* data, size_t size) {
+ BrotliDecoderCompoundDictionary* addon = state->compound_dictionary;
+ if (state->state != BROTLI_STATE_UNINITED) return BROTLI_FALSE;
+ if (!addon) {
+ addon = (BrotliDecoderCompoundDictionary*)BROTLI_DECODER_ALLOC(
+ state, sizeof(BrotliDecoderCompoundDictionary));
+ if (!addon) return BROTLI_FALSE;
+ addon->num_chunks = 0;
+ addon->total_size = 0;
+ addon->br_length = 0;
+ addon->br_copied = 0;
+ addon->block_bits = -1;
+ addon->chunk_offsets[0] = 0;
+ state->compound_dictionary = addon;
+ }
+ if (addon->num_chunks == 15) return BROTLI_FALSE;
+ addon->chunks[addon->num_chunks] = data;
+ addon->num_chunks++;
+ addon->total_size += (int)size;
+ addon->chunk_offsets[addon->num_chunks] = addon->total_size;
+ return BROTLI_TRUE;
+}
+
+static void EnsureCoumpoundDictionaryInitialized(BrotliDecoderState* state) {
+ BrotliDecoderCompoundDictionary* addon = state->compound_dictionary;
+ /* 256 = (1 << 8) slots in block map. */
+ int block_bits = 8;
+ int cursor = 0;
+ int index = 0;
+ if (addon->block_bits != -1) return;
+ while (((addon->total_size - 1) >> block_bits) != 0) block_bits++;
+ block_bits -= 8;
+ addon->block_bits = block_bits;
+ while (cursor < addon->total_size) {
+ while (addon->chunk_offsets[index + 1] < cursor) index++;
+ addon->block_map[cursor >> block_bits] = (uint8_t)index;
+ cursor += 1 << block_bits;
+ }
+}
+
+static void InitializeCompoundDictionaryCopy(BrotliDecoderState* s,
+ int address, int length, int pos) {
+ BrotliDecoderCompoundDictionary* addon = s->compound_dictionary;
+ int index;
+ EnsureCoumpoundDictionaryInitialized(s);
+ index = addon->block_map[address >> addon->block_bits];
+ while (address >= addon->chunk_offsets[index + 1]) index++;
+ if (addon->chunk_offsets[addon->num_chunks] - address < length) {
+ /* s->distance_code is set to the copy distance used once
+ the copy source advances to the backward window, i.e.,
+ after copying all bytes from the compound dictionary,
+ in order to copy the remaining bytes from the regular LZ77
+ backward window */
+ s->distance_code = s->max_backward_distance;
+ if (s->max_distance != s->max_backward_distance) {
+ int dict_copy = addon->chunk_offsets[addon->num_chunks] - address;
+ if (dict_copy < s->max_backward_distance) {
+ pos += dict_copy;
+ s->distance_code =
+ (pos < s->max_backward_distance) ? pos : s->max_backward_distance;
+ }
+ }
+ }
+ /* Update the recent distances cache. */
+ s->dist_rb[s->dist_rb_idx & 3] = s->distance_code;
+ ++s->dist_rb_idx;
+ s->meta_block_remaining_len -= length;
+ addon->br_index = index;
+ addon->br_offset = address - addon->chunk_offsets[index];
+ addon->br_length = length;
+ addon->br_copied = 0;
+}
+
+static int GetCompoundDictionarySize(BrotliDecoderState* s) {
+ return s->compound_dictionary ? s->compound_dictionary->total_size : 0;
+}
+
+static int CopyFromCompoundDictionary(BrotliDecoderState* s, int pos) {
+ BrotliDecoderCompoundDictionary* addon = s->compound_dictionary;
+ int orig_pos = pos;
+ while (addon->br_length != addon->br_copied &&
+ addon->br_index != addon->num_chunks) {
+ uint8_t* copy_dst = &s->ringbuffer[pos];
+ const uint8_t* copy_src =
+ addon->chunks[addon->br_index] + addon->br_offset;
+ int space = s->ringbuffer_size - pos;
+ int rem_chunk_length = (addon->chunk_offsets[addon->br_index + 1] -
+ addon->chunk_offsets[addon->br_index]) - addon->br_offset;
+ int length = addon->br_length - addon->br_copied;
+ if (length > rem_chunk_length) length = rem_chunk_length;
+ if (length > space) length = space;
+ memcpy(copy_dst, copy_src, (size_t)length);
+ pos += length;
+ addon->br_offset += length;
+ addon->br_copied += length;
+ if (length == rem_chunk_length) {
+ addon->br_index++;
+ addon->br_offset = 0;
+ }
+ if (pos == s->ringbuffer_size) {
+ return pos - orig_pos;
+ }
+ }
+ if (addon->br_length != addon->br_copied) {
+ int space = s->ringbuffer_size - pos;
+ int length = addon->br_length - addon->br_copied;
+ if (length > space) length = space;
+ addon->br_copied += length;
+ while (length-- != 0) {
+ s->ringbuffer[pos] =
+ s->ringbuffer[(pos - s->distance_code) & s->ringbuffer_mask];
+ pos++;
+ }
+ }
+ return pos - orig_pos;
+}
+
+BROTLI_BOOL BrotliDecoderAttachDictionary(BrotliDecoderState* state,
+ BrotliSharedDictionaryType type, const uint8_t* data, size_t size) {
+ uint32_t i;
+ uint32_t num_prefix_before = state->dictionary->num_prefix;
+ if (state->state != BROTLI_STATE_UNINITED) return BROTLI_FALSE;
+ if (!BrotliSharedDictionaryAttach(state->dictionary, type, data, size)) {
+ return BROTLI_FALSE;
+ }
+ for (i = num_prefix_before; i < state->dictionary->num_prefix; i++) {
+ if (!AttachCompoundDictionary(
+ state, state->dictionary->prefix[i],
+ state->dictionary->prefix_size[i])) {
+ return BROTLI_FALSE;
+ }
+ }
+ return BROTLI_TRUE;
+}
+
/* Calculates the smallest feasible ring buffer.
If we know the data size is small, do not allocate more ring buffer
@@ -1631,6 +1768,7 @@
int i = s->loop_counter;
BrotliDecoderErrorCode result = BROTLI_DECODER_SUCCESS;
BrotliBitReader* br = &s->br;
+ int compound_dictionary_size = GetCompoundDictionarySize(s);
if (!CheckInputAmount(safe, br, 28)) {
result = BROTLI_DECODER_NEEDS_MORE_INPUT;
@@ -1797,20 +1935,73 @@
pos, s->distance_code, i, s->meta_block_remaining_len));
return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_DISTANCE);
}
- if (i >= BROTLI_MIN_DICTIONARY_WORD_LENGTH &&
- i <= BROTLI_MAX_DICTIONARY_WORD_LENGTH) {
- int address = s->distance_code - s->max_distance - 1;
- const BrotliDictionary* words = s->dictionary;
- const BrotliTransforms* transforms = s->transforms;
- int offset = (int)s->dictionary->offsets_by_length[i];
- uint32_t shift = s->dictionary->size_bits_by_length[i];
-
+ if (s->distance_code - s->max_distance - 1 < compound_dictionary_size) {
+ int address = compound_dictionary_size -
+ (s->distance_code - s->max_distance);
+ InitializeCompoundDictionaryCopy(s, address, i, pos);
+ pos += CopyFromCompoundDictionary(s, pos);
+ if (pos >= s->ringbuffer_size) {
+ s->state = BROTLI_STATE_COMMAND_POST_WRITE_1;
+ goto saveStateAndReturn;
+ }
+ } else if (i >= SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH &&
+ i <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH) {
+ uint8_t p1 = s->ringbuffer[(pos - 1) & s->ringbuffer_mask];
+ uint8_t p2 = s->ringbuffer[(pos - 2) & s->ringbuffer_mask];
+ uint8_t dict_id = s->dictionary->context_based ?
+ s->dictionary->context_map[BROTLI_CONTEXT(p1, p2, s->context_lookup)]
+ : 0;
+ const BrotliDictionary* words = s->dictionary->words[dict_id];
+ const BrotliTransforms* transforms = s->dictionary->transforms[dict_id];
+ int offset = (int)words->offsets_by_length[i];
+ uint32_t shift = words->size_bits_by_length[i];
+ int address =
+ s->distance_code - s->max_distance - 1 - compound_dictionary_size;
int mask = (int)BitMask(shift);
int word_idx = address & mask;
int transform_idx = address >> shift;
/* Compensate double distance-ring-buffer roll. */
s->dist_rb_idx += s->distance_context;
offset += word_idx * i;
+ /* If the distance is out of bound, select a next static dictionary if
+ there exist multiple. */
+ if ((transform_idx >= (int)transforms->num_transforms ||
+ words->size_bits_by_length[i] == 0) &&
+ s->dictionary->num_dictionaries > 1) {
+ uint8_t dict_id2;
+ int dist_remaining = address -
+ (int)(((1u << shift) & ~1u)) * (int)transforms->num_transforms;
+ for (dict_id2 = 0; dict_id2 < s->dictionary->num_dictionaries;
+ dict_id2++) {
+ const BrotliDictionary* words2 = s->dictionary->words[dict_id2];
+ if (dict_id2 != dict_id && words2->size_bits_by_length[i] != 0) {
+ const BrotliTransforms* transforms2 =
+ s->dictionary->transforms[dict_id2];
+ uint32_t shift2 = words2->size_bits_by_length[i];
+ int num = (int)((1u << shift2) & ~1u) *
+ (int)transforms2->num_transforms;
+ if (dist_remaining < num) {
+ dict_id = dict_id2;
+ words = words2;
+ transforms = transforms2;
+ address = dist_remaining;
+ shift = shift2;
+ mask = (int)BitMask(shift);
+ word_idx = address & mask;
+ transform_idx = address >> shift;
+ offset = (int)words->offsets_by_length[i] + word_idx * i;
+ break;
+ }
+ dist_remaining -= num;
+ }
+ }
+ }
+ if (BROTLI_PREDICT_FALSE(words->size_bits_by_length[i] == 0)) {
+ BROTLI_LOG(("Invalid backward reference. pos: %d distance: %d "
+ "len: %d bytes left: %d\n",
+ pos, s->distance_code, i, s->meta_block_remaining_len));
+ return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_DICTIONARY);
+ }
if (BROTLI_PREDICT_FALSE(!words->data)) {
return BROTLI_FAILURE(BROTLI_DECODER_ERROR_DICTIONARY_NOT_SET);
}
@@ -1827,6 +2018,10 @@
BROTLI_LOG(("[ProcessCommandsInternal] dictionary word: [%.*s],"
" transform_idx = %d, transformed: [%.*s]\n",
i, word, transform_idx, len, &s->ringbuffer[pos]));
+ if (len == 0 && s->distance_code <= 120) {
+ BROTLI_LOG(("Invalid length-0 dictionary word after transform\n"));
+ return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_TRANSFORM);
+ }
}
pos += len;
s->meta_block_remaining_len -= len;
@@ -2370,6 +2565,11 @@
s->max_distance = s->max_backward_distance;
}
if (s->state == BROTLI_STATE_COMMAND_POST_WRITE_1) {
+ BrotliDecoderCompoundDictionary* addon = s->compound_dictionary;
+ if (addon && (addon->br_length != addon->br_copied)) {
+ s->pos += CopyFromCompoundDictionary(s, s->pos);
+ if (s->pos >= s->ringbuffer_size) continue;
+ }
if (s->meta_block_remaining_len == 0) {
/* Next metablock, if any. */
s->state = BROTLI_STATE_METABLOCK_DONE;
diff --git a/c/dec/state.c b/c/dec/state.c
index e0b37c2..5228468 100644
--- a/c/dec/state.c
+++ b/c/dec/state.c
@@ -8,6 +8,7 @@
#include <stdlib.h> /* free, malloc */
+#include "../common/dictionary.h"
#include <brotli/types.h>
#include "./huffman.h"
@@ -89,8 +90,10 @@
s->mtf_upper_bound = 63;
- s->dictionary = BrotliGetDictionary();
- s->transforms = BrotliGetTransforms();
+ s->compound_dictionary = NULL;
+ s->dictionary =
+ BrotliSharedDictionaryCreateInstance(alloc_func, free_func, opaque);
+ if (!s->dictionary) return BROTLI_FALSE;
return BROTLI_TRUE;
}
@@ -137,6 +140,9 @@
void BrotliDecoderStateCleanup(BrotliDecoderState* s) {
BrotliDecoderStateCleanupAfterMetablock(s);
+ BROTLI_DECODER_FREE(s, s->compound_dictionary);
+ BrotliSharedDictionaryDestroyInstance(s->dictionary);
+ s->dictionary = NULL;
BROTLI_DECODER_FREE(s, s->ringbuffer);
BROTLI_DECODER_FREE(s, s->block_type_trees);
}
diff --git a/c/dec/state.h b/c/dec/state.h
index d28b639..e029c8f 100644
--- a/c/dec/state.h
+++ b/c/dec/state.h
@@ -12,6 +12,7 @@
#include "../common/constants.h"
#include "../common/dictionary.h"
#include "../common/platform.h"
+#include <brotli/shared_dictionary.h>
#include "../common/transform.h"
#include <brotli/types.h>
#include "./bit_reader.h"
@@ -98,6 +99,20 @@
BROTLI_STATE_READ_BLOCK_LENGTH_SUFFIX
} BrotliRunningReadBlockLengthState;
+/* BrotliDecoderState addon, used for Compound Dictionary functionality. */
+typedef struct BrotliDecoderCompoundDictionary {
+ int num_chunks;
+ int total_size;
+ int br_index;
+ int br_offset;
+ int br_length;
+ int br_copied;
+ const uint8_t* chunks[16];
+ int chunk_offsets[16];
+ int block_bits;
+ uint8_t block_map[256];
+} BrotliDecoderCompoundDictionary;
+
struct BrotliDecoderStateStruct {
BrotliRunningState state;
@@ -225,8 +240,8 @@
uint8_t* context_map;
uint8_t* context_modes;
- const BrotliDictionary* dictionary;
- const BrotliTransforms* transforms;
+ BrotliSharedDictionary* dictionary;
+ BrotliDecoderCompoundDictionary* compound_dictionary;
uint32_t trivial_literal_contexts[8]; /* 256 bits */
};
diff --git a/c/enc/backward_references.c b/c/enc/backward_references.c
index cd023d9..74ebd1a 100644
--- a/c/enc/backward_references.c
+++ b/c/enc/backward_references.c
@@ -13,7 +13,9 @@
#include "../common/platform.h"
#include <brotli/types.h>
#include "./command.h"
+#include "./compound_dictionary.h"
#include "./dictionary_hash.h"
+#include "./encoder_dict.h"
#include "./memory.h"
#include "./quality.h"
@@ -51,6 +53,7 @@
#define EXPORT_FN(X) EXPAND_CAT(X, EXPAND_CAT(PREFIX(), HASHER()))
#define PREFIX() N
+#define ENABLE_COMPOUND_DICTIONARY 0
#define HASHER() H2
/* NOLINTNEXTLINE(build/include) */
@@ -97,21 +100,33 @@
#include "./backward_references_inc.h"
#undef HASHER
-#define HASHER() H35
+#undef ENABLE_COMPOUND_DICTIONARY
+#undef PREFIX
+#define PREFIX() D
+#define ENABLE_COMPOUND_DICTIONARY 1
+
+#define HASHER() H5
+/* NOLINTNEXTLINE(build/include) */
+#include "./backward_references_inc.h"
+#undef HASHER
+#define HASHER() H6
+/* NOLINTNEXTLINE(build/include) */
+#include "./backward_references_inc.h"
+#undef HASHER
+#define HASHER() H40
+/* NOLINTNEXTLINE(build/include) */
+#include "./backward_references_inc.h"
+#undef HASHER
+#define HASHER() H41
+/* NOLINTNEXTLINE(build/include) */
+#include "./backward_references_inc.h"
+#undef HASHER
+#define HASHER() H42
/* NOLINTNEXTLINE(build/include) */
#include "./backward_references_inc.h"
#undef HASHER
-#define HASHER() H55
-/* NOLINTNEXTLINE(build/include) */
-#include "./backward_references_inc.h"
-#undef HASHER
-
-#define HASHER() H65
-/* NOLINTNEXTLINE(build/include) */
-#include "./backward_references_inc.h"
-#undef HASHER
-
+#undef ENABLE_COMPOUND_DICTIONARY
#undef PREFIX
#undef EXPORT_FN
@@ -119,17 +134,37 @@
#undef CAT
#undef EXPAND_CAT
-void BrotliCreateBackwardReferences(
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+void BrotliCreateBackwardReferences(size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals) {
+ if (params->dictionary.compound.num_chunks != 0) {
+ switch (params->hasher.type) {
+#define CASE_(N) \
+ case N: \
+ CreateBackwardReferencesDH ## N(num_bytes, \
+ position, ringbuffer, ringbuffer_mask, \
+ literal_context_lut, params, hasher, dist_cache, \
+ last_insert_len, commands, num_commands, num_literals); \
+ return;
+ CASE_(5)
+ CASE_(6)
+ CASE_(40)
+ CASE_(41)
+ CASE_(42)
+#undef CASE_
+ default:
+ break;
+ }
+ }
+
switch (params->hasher.type) {
#define CASE_(N) \
case N: \
- CreateBackwardReferencesNH ## N( \
- num_bytes, position, ringbuffer, \
- ringbuffer_mask, params, hasher, dist_cache, \
+ CreateBackwardReferencesNH ## N(num_bytes, \
+ position, ringbuffer, ringbuffer_mask, \
+ literal_context_lut, params, hasher, dist_cache, \
last_insert_len, commands, num_commands, num_literals); \
return;
FOR_GENERIC_HASHERS(CASE_)
diff --git a/c/enc/backward_references.h b/c/enc/backward_references.h
index 3a41466..1f94486 100644
--- a/c/enc/backward_references.h
+++ b/c/enc/backward_references.h
@@ -10,6 +10,7 @@
#define BROTLI_ENC_BACKWARD_REFERENCES_H_
#include "../common/constants.h"
+#include "../common/context.h"
#include "../common/dictionary.h"
#include "../common/platform.h"
#include <brotli/types.h>
@@ -25,9 +26,9 @@
initially the total amount of commands output by previous
CreateBackwardReferences calls, and must be incremented by the amount written
by this call. */
-BROTLI_INTERNAL void BrotliCreateBackwardReferences(
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+BROTLI_INTERNAL void BrotliCreateBackwardReferences(size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals);
diff --git a/c/enc/backward_references_hq.c b/c/enc/backward_references_hq.c
index e7486c4..cafffd8 100644
--- a/c/enc/backward_references_hq.c
+++ b/c/enc/backward_references_hq.c
@@ -14,6 +14,8 @@
#include "../common/platform.h"
#include <brotli/types.h>
#include "./command.h"
+#include "./compound_dictionary.h"
+#include "./encoder_dict.h"
#include "./fast_log.h"
#include "./find_match_length.h"
#include "./literal_cost.h"
@@ -417,7 +419,8 @@
size_t min_len;
size_t result = 0;
size_t k;
- size_t gap = 0;
+ const CompoundDictionary* addon = ¶ms->dictionary.compound;
+ size_t gap = addon->total_size;
EvaluateNode(block_start, pos, max_backward_limit, gap, starting_dist_cache,
model, queue, nodes);
@@ -470,7 +473,23 @@
&ringbuffer[cur_ix_masked],
max_len);
} else {
- continue;
+ size_t d = 0;
+ size_t offset;
+ size_t limit;
+ const uint8_t* source;
+ offset = max_distance + 1 + addon->total_size - 1;
+ while (offset >= backward + addon->chunk_offsets[d + 1]) d++;
+ source = addon->chunk_source[d];
+ offset = offset - addon->chunk_offsets[d] - backward;
+ limit = addon->chunk_offsets[d + 1] - addon->chunk_offsets[d] - offset;
+ limit = limit > max_len ? max_len : limit;
+ if (best_len >= limit ||
+ continuation != source[offset + best_len]) {
+ continue;
+ }
+ len = FindMatchLengthWithLimit(&source[offset],
+ &ringbuffer[cur_ix_masked],
+ limit);
}
{
const float dist_cost = base_cost +
@@ -575,7 +594,7 @@
size_t pos = 0;
uint32_t offset = nodes[0].u.next;
size_t i;
- size_t gap = 0;
+ size_t gap = params->dictionary.compound.total_size;
for (i = 0; offset != BROTLI_UINT32_MAX; i++) {
const ZopfliNode* next = &nodes[pos + offset];
size_t copy_length = ZopfliNodeCopyLength(next);
@@ -655,10 +674,27 @@
return ComputeShortestPathFromNodes(num_bytes, nodes);
}
+static void MergeMatches(BackwardMatch* dst,
+ BackwardMatch* src1, size_t len1, BackwardMatch* src2, size_t len2) {
+ while (len1 > 0 && len2 > 0) {
+ size_t l1 = BackwardMatchLength(src1);
+ size_t l2 = BackwardMatchLength(src2);
+ if (l1 < l2 || ((l1 == l2) && (src1->distance < src2->distance))) {
+ *dst++ = *src1++;
+ len1--;
+ } else {
+ *dst++ = *src2++;
+ len2--;
+ }
+ }
+ while (len1-- > 0) *dst++ = *src1++;
+ while (len2-- > 0) *dst++ = *src2++;
+}
+
/* REQUIRES: nodes != NULL and len(nodes) >= num_bytes + 1 */
-size_t BrotliZopfliComputeShortestPath(MemoryManager* m,
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+size_t BrotliZopfliComputeShortestPath(MemoryManager* m, size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
const size_t max_backward_limit, const int* dist_cache, HasherHandle hasher,
ZopfliNode* nodes) {
const size_t max_zopfli_len = MaxZopfliLen(params);
@@ -668,8 +704,10 @@
const size_t store_end = num_bytes >= StoreLookaheadH10() ?
position + num_bytes - StoreLookaheadH10() + 1 : position;
size_t i;
- size_t gap = 0;
- size_t lz_matches_offset = 0;
+ const CompoundDictionary* addon = ¶ms->dictionary.compound;
+ size_t gap = addon->total_size;
+ size_t lz_matches_offset =
+ (addon->num_chunks != 0) ? (MAX_NUM_MATCHES_H10 + 128) : 0;
nodes[0].length = 0;
nodes[0].u.cost = 0;
InitZopfliCostModel(m, &model, ¶ms->dist, num_bytes);
@@ -681,9 +719,29 @@
const size_t pos = position + i;
const size_t max_distance = BROTLI_MIN(size_t, pos, max_backward_limit);
size_t skip;
- size_t num_matches = FindAllMatchesH10(hasher, ¶ms->dictionary,
- ringbuffer, ringbuffer_mask, pos, num_bytes - i, max_distance, gap,
- params, &matches[lz_matches_offset]);
+ size_t num_matches;
+ int dict_id = 0;
+ if (params->dictionary.contextual.context_based) {
+ uint8_t p1 = pos >= 1 ?
+ ringbuffer[(size_t)(pos - 1) & ringbuffer_mask] : 0;
+ uint8_t p2 = pos >= 2 ?
+ ringbuffer[(size_t)(pos - 2) & ringbuffer_mask] : 0;
+ dict_id = params->dictionary.contextual.context_map[
+ BROTLI_CONTEXT(p1, p2, literal_context_lut)];
+ }
+ num_matches = FindAllMatchesH10(hasher,
+ params->dictionary.contextual.dict[dict_id],
+ ringbuffer, ringbuffer_mask, pos, num_bytes - i,
+ max_distance, gap, params, &matches[lz_matches_offset]);
+ if (addon->num_chunks != 0) {
+ size_t cd_matches = LookupAllCompoundDictionaryMatches(addon,
+ ringbuffer, ringbuffer_mask, pos, 3, num_bytes - i,
+ max_distance, params->dist.max_distance,
+ &matches[lz_matches_offset - 64], 64);
+ MergeMatches(matches, &matches[lz_matches_offset - 64], cd_matches,
+ &matches[lz_matches_offset], num_matches);
+ num_matches += cd_matches;
+ }
if (num_matches > 0 &&
BackwardMatchLength(&matches[num_matches - 1]) > max_zopfli_len) {
matches[0] = matches[num_matches - 1];
@@ -714,9 +772,9 @@
return ComputeShortestPathFromNodes(num_bytes, nodes);
}
-void BrotliCreateZopfliBackwardReferences(MemoryManager* m,
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+void BrotliCreateZopfliBackwardReferences(MemoryManager* m, size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals) {
const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin);
@@ -724,18 +782,18 @@
nodes = BROTLI_ALLOC(m, ZopfliNode, num_bytes + 1);
if (BROTLI_IS_OOM(m)) return;
BrotliInitZopfliNodes(nodes, num_bytes + 1);
- *num_commands += BrotliZopfliComputeShortestPath(m,
- num_bytes, position, ringbuffer, ringbuffer_mask,
- params, max_backward_limit, dist_cache, hasher, nodes);
+ *num_commands += BrotliZopfliComputeShortestPath(m, num_bytes,
+ position, ringbuffer, ringbuffer_mask, literal_context_lut, params,
+ max_backward_limit, dist_cache, hasher, nodes);
if (BROTLI_IS_OOM(m)) return;
BrotliZopfliCreateCommands(num_bytes, position, max_backward_limit, nodes,
dist_cache, last_insert_len, params, commands, num_literals);
BROTLI_FREE(m, nodes);
}
-void BrotliCreateHqZopfliBackwardReferences(MemoryManager* m,
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+void BrotliCreateHqZopfliBackwardReferences(MemoryManager* m, size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals) {
const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin);
@@ -752,8 +810,10 @@
ZopfliCostModel model;
ZopfliNode* nodes;
BackwardMatch* matches = BROTLI_ALLOC(m, BackwardMatch, matches_size);
- size_t gap = 0;
- size_t shadow_matches = 0;
+ const CompoundDictionary* addon = ¶ms->dictionary.compound;
+ size_t gap = addon->total_size;
+ size_t shadow_matches =
+ (addon->num_chunks != 0) ? (MAX_NUM_MATCHES_H10 + 128) : 0;
if (BROTLI_IS_OOM(m)) return;
for (i = 0; i + HashTypeLengthH10() - 1 < num_bytes; ++i) {
const size_t pos = position + i;
@@ -762,13 +822,33 @@
size_t num_found_matches;
size_t cur_match_end;
size_t j;
+ int dict_id = 0;
+ if (params->dictionary.contextual.context_based) {
+ uint8_t p1 = pos >= 1 ?
+ ringbuffer[(size_t)(pos - 1) & ringbuffer_mask] : 0;
+ uint8_t p2 = pos >= 2 ?
+ ringbuffer[(size_t)(pos - 2) & ringbuffer_mask] : 0;
+ dict_id = params->dictionary.contextual.context_map[
+ BROTLI_CONTEXT(p1, p2, literal_context_lut)];
+ }
/* Ensure that we have enough free slots. */
BROTLI_ENSURE_CAPACITY(m, BackwardMatch, matches, matches_size,
cur_match_pos + MAX_NUM_MATCHES_H10 + shadow_matches);
if (BROTLI_IS_OOM(m)) return;
num_found_matches = FindAllMatchesH10(hasher,
- ¶ms->dictionary, ringbuffer, ringbuffer_mask, pos, max_length,
+ params->dictionary.contextual.dict[dict_id],
+ ringbuffer, ringbuffer_mask, pos, max_length,
max_distance, gap, params, &matches[cur_match_pos + shadow_matches]);
+ if (addon->num_chunks != 0) {
+ size_t cd_matches = LookupAllCompoundDictionaryMatches(addon,
+ ringbuffer, ringbuffer_mask, pos, 3, max_length,
+ max_distance, params->dist.max_distance,
+ &matches[cur_match_pos + shadow_matches - 64], 64);
+ MergeMatches(&matches[cur_match_pos],
+ &matches[cur_match_pos + shadow_matches - 64], cd_matches,
+ &matches[cur_match_pos + shadow_matches], num_found_matches);
+ num_found_matches += cd_matches;
+ }
cur_match_end = cur_match_pos + num_found_matches;
for (j = cur_match_pos; j + 1 < cur_match_end; ++j) {
BROTLI_DCHECK(BackwardMatchLength(&matches[j]) <=
diff --git a/c/enc/backward_references_hq.h b/c/enc/backward_references_hq.h
index 7c38bd6..ebfd2fa 100644
--- a/c/enc/backward_references_hq.h
+++ b/c/enc/backward_references_hq.h
@@ -10,6 +10,7 @@
#define BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_
#include "../common/constants.h"
+#include "../common/context.h"
#include "../common/dictionary.h"
#include "../common/platform.h"
#include <brotli/types.h>
@@ -23,14 +24,16 @@
#endif
BROTLI_INTERNAL void BrotliCreateZopfliBackwardReferences(MemoryManager* m,
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+ size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals);
BROTLI_INTERNAL void BrotliCreateHqZopfliBackwardReferences(MemoryManager* m,
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+ size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals);
@@ -74,9 +77,10 @@
(1) nodes[i].copy_length() >= 2
(2) nodes[i].command_length() <= i and
(3) nodes[i - nodes[i].command_length()].cost < kInfinity */
-BROTLI_INTERNAL size_t BrotliZopfliComputeShortestPath(MemoryManager* m,
- size_t num_bytes, size_t position, const uint8_t* ringbuffer,
- size_t ringbuffer_mask, const BrotliEncoderParams* params,
+BROTLI_INTERNAL size_t BrotliZopfliComputeShortestPath(
+ MemoryManager* m, size_t num_bytes,
+ size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
const size_t max_backward_limit, const int* dist_cache, HasherHandle hasher,
ZopfliNode* nodes);
diff --git a/c/enc/backward_references_inc.h b/c/enc/backward_references_inc.h
index 38a48d3..c81e131 100644
--- a/c/enc/backward_references_inc.h
+++ b/c/enc/backward_references_inc.h
@@ -10,9 +10,9 @@
static BROTLI_NOINLINE void EXPORT_FN(CreateBackwardReferences)(
size_t num_bytes, size_t position,
const uint8_t* ringbuffer, size_t ringbuffer_mask,
- const BrotliEncoderParams* params, HasherHandle hasher, int* dist_cache,
- size_t* last_insert_len, Command* commands, size_t* num_commands,
- size_t* num_literals) {
+ ContextLut literal_context_lut, const BrotliEncoderParams* params,
+ HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
+ Command* commands, size_t* num_commands, size_t* num_literals) {
/* Set maximum distance, see section 9.1. of the spec. */
const size_t max_backward_limit = BROTLI_MAX_BACKWARD_LIMIT(params->lgwin);
@@ -26,7 +26,7 @@
const size_t random_heuristics_window_size =
LiteralSpreeLengthForSparseSearch(params);
size_t apply_random_heuristics = position + random_heuristics_window_size;
- const size_t gap = 0;
+ const size_t gap = params->dictionary.compound.total_size;
/* Minimum score to accept a backward reference. */
const score_t kMinScore = BROTLI_SCORE_BASE + 100;
@@ -37,14 +37,29 @@
size_t max_length = pos_end - position;
size_t max_distance = BROTLI_MIN(size_t, position, max_backward_limit);
HasherSearchResult sr;
+ int dict_id = 0;
+ uint8_t p1 = 0;
+ uint8_t p2 = 0;
+ if (params->dictionary.contextual.context_based) {
+ p1 = position >= 1 ?
+ ringbuffer[(size_t)(position - 1) & ringbuffer_mask] : 0;
+ p2 = position >= 2 ?
+ ringbuffer[(size_t)(position - 2) & ringbuffer_mask] : 0;
+ dict_id = params->dictionary.contextual.context_map[
+ BROTLI_CONTEXT(p1, p2, literal_context_lut)];
+ }
sr.len = 0;
sr.len_code_delta = 0;
sr.distance = 0;
sr.score = kMinScore;
- FN(FindLongestMatch)(hasher, ¶ms->dictionary,
- ringbuffer, ringbuffer_mask, dist_cache, position,
- max_length, max_distance, gap,
- params->dist.max_distance, &sr);
+ FN(FindLongestMatch)(hasher, params->dictionary.contextual.dict[dict_id],
+ ringbuffer, ringbuffer_mask, dist_cache, position, max_length,
+ max_distance, gap, params->dist.max_distance, &sr);
+ if (ENABLE_COMPOUND_DICTIONARY) {
+ LookupCompoundDictionaryMatch(¶ms->dictionary.compound, ringbuffer,
+ ringbuffer_mask, dist_cache, position, max_length,
+ max_distance, params->dist.max_distance, &sr);
+ }
if (sr.score > kMinScore) {
/* Found a match. Let's look for something even better ahead. */
int delayed_backward_references_in_row = 0;
@@ -58,9 +73,22 @@
sr2.distance = 0;
sr2.score = kMinScore;
max_distance = BROTLI_MIN(size_t, position + 1, max_backward_limit);
- FN(FindLongestMatch)(hasher, ¶ms->dictionary,
+ if (params->dictionary.contextual.context_based) {
+ p2 = p1;
+ p1 = ringbuffer[position & ringbuffer_mask];
+ dict_id = params->dictionary.contextual.context_map[
+ BROTLI_CONTEXT(p1, p2, literal_context_lut)];
+ }
+ FN(FindLongestMatch)(hasher,
+ params->dictionary.contextual.dict[dict_id],
ringbuffer, ringbuffer_mask, dist_cache, position + 1, max_length,
max_distance, gap, params->dist.max_distance, &sr2);
+ if (ENABLE_COMPOUND_DICTIONARY) {
+ LookupCompoundDictionaryMatch(
+ ¶ms->dictionary.compound, ringbuffer,
+ ringbuffer_mask, dist_cache, position + 1, max_length,
+ max_distance, params->dist.max_distance, &sr2);
+ }
if (sr2.score >= sr.score + cost_diff_lazy) {
/* Ok, let's just write one byte for now and start a match from the
next byte. */
diff --git a/c/enc/compound_dictionary.c b/c/enc/compound_dictionary.c
new file mode 100755
index 0000000..3e504d6
--- /dev/null
+++ b/c/enc/compound_dictionary.c
@@ -0,0 +1,200 @@
+/* Copyright 2017 Google Inc. All Rights Reserved.
+
+ Distributed under MIT license.
+ See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+#include "./compound_dictionary.h"
+
+#include "../common/platform.h"
+#include <brotli/types.h>
+#include "./memory.h"
+#include "./quality.h"
+
+static PreparedDictionary* CreatePreparedDictionaryWithParams(MemoryManager* m,
+ const uint8_t* source, size_t source_size, uint32_t bucket_bits,
+ uint32_t slot_bits, uint32_t hash_bits, uint16_t bucket_limit) {
+ /* Step 1: create "bloated" hasher. */
+ uint32_t num_slots = 1u << slot_bits;
+ uint32_t num_buckets = 1u << bucket_bits;
+ uint32_t hash_shift = 64u - bucket_bits;
+ uint64_t hash_mask = (~((uint64_t)0U)) >> (64 - hash_bits);
+ uint32_t slot_mask = num_slots - 1;
+ size_t alloc_size = (sizeof(uint32_t) << slot_bits) +
+ (sizeof(uint32_t) << slot_bits) +
+ (sizeof(uint16_t) << bucket_bits) +
+ (sizeof(uint32_t) << bucket_bits) +
+ (sizeof(uint32_t) * source_size);
+ uint8_t* flat = NULL;
+ PreparedDictionary* result = NULL;
+ uint16_t* num = NULL;
+ uint32_t* bucket_heads = NULL;
+ uint32_t* next_bucket = NULL;
+ uint32_t* slot_offsets = NULL;
+ uint16_t* heads = NULL;
+ uint32_t* items = NULL;
+ uint8_t* source_copy = NULL;
+ uint32_t i;
+ uint32_t* slot_size = NULL;
+ uint32_t* slot_limit = NULL;
+ uint32_t total_items = 0;
+ if (slot_bits > 16) return NULL;
+ if (slot_bits > bucket_bits) return NULL;
+ if (bucket_bits - slot_bits >= 16) return NULL;
+
+ flat = BROTLI_ALLOC(m, uint8_t, alloc_size);
+ if (BROTLI_IS_OOM(m)) return NULL;
+
+ slot_size = (uint32_t*)flat;
+ slot_limit = (uint32_t*)(&slot_size[num_slots]);
+ num = (uint16_t*)(&slot_limit[num_slots]);
+ bucket_heads = (uint32_t*)(&num[num_buckets]);
+ next_bucket = (uint32_t*)(&bucket_heads[num_buckets]);
+ memset(num, 0, num_buckets * sizeof(num[0]));
+
+ /* TODO: apply custom "store" order. */
+ for (i = 0; i + 7 < source_size; ++i) {
+ const uint64_t h = (BROTLI_UNALIGNED_LOAD64LE(&source[i]) & hash_mask) *
+ kPreparedDictionaryHashMul64Long;
+ const uint32_t key = (uint32_t)(h >> hash_shift);
+ uint16_t count = num[key];
+ next_bucket[i] = (count == 0) ? ((uint32_t)(-1)) : bucket_heads[key];
+ bucket_heads[key] = i;
+ count++;
+ if (count > bucket_limit) count = bucket_limit;
+ num[key] = count;
+ }
+
+ /* Step 2: find slot limits. */
+ for (i = 0; i < num_slots; ++i) {
+ BROTLI_BOOL overflow = BROTLI_FALSE;
+ slot_limit[i] = bucket_limit;
+ while (BROTLI_TRUE) {
+ uint32_t limit = slot_limit[i];
+ size_t j;
+ uint32_t count = 0;
+ overflow = BROTLI_FALSE;
+ for (j = i; j < num_buckets; j += num_slots) {
+ uint32_t size = num[j];
+ /* Last chain may span behind 64K limit; overflow happens only if
+ we are about to use 0xFFFF+ as item offset. */
+ if (count >= 0xFFFF) {
+ overflow = BROTLI_TRUE;
+ break;
+ }
+ if (size > limit) size = limit;
+ count += size;
+ }
+ if (!overflow) {
+ slot_size[i] = count;
+ total_items += count;
+ break;
+ }
+ slot_limit[i]--;
+ }
+ }
+
+ /* Step 3: transfer data to "slim" hasher. */
+ alloc_size = sizeof(PreparedDictionary) + (sizeof(uint32_t) << slot_bits) +
+ (sizeof(uint16_t) << bucket_bits) + (sizeof(uint32_t) * total_items) +
+ source_size;
+
+ result = (PreparedDictionary*)BROTLI_ALLOC(m, uint8_t, alloc_size);
+ if (BROTLI_IS_OOM(m)) {
+ BROTLI_FREE(m, flat);
+ return NULL;
+ }
+ slot_offsets = (uint32_t*)(&result[1]);
+ heads = (uint16_t*)(&slot_offsets[num_slots]);
+ items = (uint32_t*)(&heads[num_buckets]);
+ source_copy = (uint8_t*)(&items[total_items]);
+
+ result->magic = kPreparedDictionaryMagic;
+ result->source_offset = total_items;
+ result->source_size = (uint32_t)source_size;
+ result->hash_bits = hash_bits;
+ result->bucket_bits = bucket_bits;
+ result->slot_bits = slot_bits;
+
+ total_items = 0;
+ for (i = 0; i < num_slots; ++i) {
+ slot_offsets[i] = total_items;
+ total_items += slot_size[i];
+ slot_size[i] = 0;
+ }
+ for (i = 0; i < num_buckets; ++i) {
+ uint32_t slot = i & slot_mask;
+ uint32_t count = num[i];
+ uint32_t pos;
+ size_t j;
+ size_t cursor = slot_size[slot];
+ if (count > slot_limit[slot]) count = slot_limit[slot];
+ if (count == 0) {
+ heads[i] = 0xFFFF;
+ continue;
+ }
+ heads[i] = (uint16_t)cursor;
+ cursor += slot_offsets[slot];
+ slot_size[slot] += count;
+ pos = bucket_heads[i];
+ for (j = 0; j < count; j++) {
+ items[cursor++] = pos;
+ pos = next_bucket[pos];
+ }
+ items[cursor - 1] |= 0x80000000;
+ }
+
+ BROTLI_FREE(m, flat);
+ memcpy(source_copy, source, source_size);
+ return result;
+}
+
+PreparedDictionary* CreatePreparedDictionary(MemoryManager* m,
+ const uint8_t* source, size_t source_size) {
+ uint32_t bucket_bits = 17;
+ uint32_t slot_bits = 7;
+ uint32_t hash_bits = 40;
+ uint16_t bucket_limit = 32;
+ size_t volume = 16u << bucket_bits;
+ /* Tune parameters to fit dictionary size. */
+ while (volume < source_size && bucket_bits < 22) {
+ bucket_bits++;
+ slot_bits++;
+ volume <<= 1;
+ }
+ return CreatePreparedDictionaryWithParams(m,
+ source, source_size, bucket_bits, slot_bits, hash_bits, bucket_limit);
+}
+
+void DestroyPreparedDictionary(MemoryManager* m,
+ PreparedDictionary* dictionary) {
+ if (!dictionary) return;
+ BROTLI_FREE(m, dictionary);
+}
+
+BROTLI_BOOL AttachPreparedDictionary(
+ CompoundDictionary* compound, const PreparedDictionary* dictionary) {
+ size_t length = 0;
+ size_t index = 0;
+
+ if (compound->num_chunks == SHARED_BROTLI_MAX_COMPOUND_DICTS) {
+ return BROTLI_FALSE;
+ }
+
+ if (!dictionary) return BROTLI_FALSE;
+
+ length = dictionary->source_size;
+ index = compound->num_chunks;
+ compound->total_size += length;
+ compound->chunks[index] = dictionary;
+ compound->chunk_offsets[index + 1] = compound->total_size;
+ {
+ uint32_t* slot_offsets = (uint32_t*)(&dictionary[1]);
+ uint16_t* heads = (uint16_t*)(&slot_offsets[1u << dictionary->slot_bits]);
+ uint32_t* items = (uint32_t*)(&heads[1u << dictionary->bucket_bits]);
+ compound->chunk_source[index] =
+ (const uint8_t*)(&items[dictionary->source_offset]);
+ }
+ compound->num_chunks++;
+ return BROTLI_TRUE;
+}
diff --git a/c/enc/compound_dictionary.h b/c/enc/compound_dictionary.h
new file mode 100755
index 0000000..5e1dfe2
--- /dev/null
+++ b/c/enc/compound_dictionary.h
@@ -0,0 +1,60 @@
+/* Copyright 2017 Google Inc. All Rights Reserved.
+
+ Distributed under MIT license.
+ See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+#ifndef BROTLI_ENC_PREPARED_DICTIONARY_H_
+#define BROTLI_ENC_PREPARED_DICTIONARY_H_
+
+#include "../common/platform.h"
+#include "../common/constants.h"
+#include <brotli/shared_dictionary.h>
+#include <brotli/types.h>
+#include "./memory.h"
+
+static const uint32_t kPreparedDictionaryMagic = 0xDEBCEDE0;
+static const uint64_t kPreparedDictionaryHashMul64Long =
+ BROTLI_MAKE_UINT64_T(0x1FE35A7Bu, 0xD3579BD3u);
+
+typedef struct PreparedDictionary {
+ uint32_t magic;
+ uint32_t source_offset;
+ uint32_t source_size;
+ uint32_t hash_bits;
+ uint32_t bucket_bits;
+ uint32_t slot_bits;
+
+ /* --- Dynamic size members --- */
+
+ /* uint32_t slot_offsets[1 << slot_bits]; */
+ /* uint16_t heads[1 << bucket_bits]; */
+ /* uint32_t items[variable]; */
+
+ /* uint8_t source[source_size] */
+} PreparedDictionary;
+
+BROTLI_INTERNAL PreparedDictionary* CreatePreparedDictionary(MemoryManager* m,
+ const uint8_t* source, size_t source_size);
+
+BROTLI_INTERNAL void DestroyPreparedDictionary(MemoryManager* m,
+ PreparedDictionary* dictionary);
+
+typedef struct CompoundDictionary {
+ /* LZ77 prefix, compound dictionary */
+ size_t num_chunks;
+ size_t total_size;
+ /* Client instances. */
+ const PreparedDictionary* chunks[SHARED_BROTLI_MAX_COMPOUND_DICTS + 1];
+ const uint8_t* chunk_source[SHARED_BROTLI_MAX_COMPOUND_DICTS + 1];
+ size_t chunk_offsets[SHARED_BROTLI_MAX_COMPOUND_DICTS + 1];
+
+ size_t num_prepared_instances_;
+ /* Owned instances. */
+ PreparedDictionary* prepared_instances_[SHARED_BROTLI_MAX_COMPOUND_DICTS + 1];
+} CompoundDictionary;
+
+BROTLI_INTERNAL BROTLI_BOOL AttachPreparedDictionary(
+ CompoundDictionary* compound, const PreparedDictionary* dictionary);
+
+#endif /* BROTLI_ENC_PREPARED_DICTIONARY */
diff --git a/c/enc/dictionary_hash.c b/c/enc/dictionary_hash.c
index 3677d7d..16d853f 100644
--- a/c/enc/dictionary_hash.c
+++ b/c/enc/dictionary_hash.c
@@ -13,1107 +13,1833 @@
extern "C" {
#endif
-BROTLI_INTERNAL const uint16_t kStaticDictionaryHash[32768] = {
-32072,0,0,0,0,0,0,0,0,21860,0,0,0,0,0,0,0,40486,0,0,0,0,0,45798,0,0,0,0,0,0,1292
-,0,0,0,0,4964,278,23717,0,19972,0,0,0,0,0,0,0,0,0,0,0,0,2126,16102,0,0,0,14437,0
-,0,0,0,0,0,0,26727,2253,0,0,17252,0,0,0,0,0,0,0,0,0,3622,0,0,0,0,22984,0,0,0,0,0
-,0,16647,0,34247,0,0,0,0,0,48486,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2511,0,0,0,0,0,0,0,
-0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,19532,0,0,24004,0,0,0,9828,0
-,0,0,0,0,0,0,0,0,0,0,0,0,0,0,30853,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-,0,0,0,0,0,0,0,0,0,0,31974,0,0,0,0,0,0,0,0,20650,2404,0,20773,1677,9031,0,6404,0
-,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,51879,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6761,7206
-,0,0,21992,22983,0,0,3529,0,1864,0,0,0,0,0,0,11046,0,0,9641,0,0,0,6507,0,0,36934
-,21576,62375,0,0,0,0,0,0,0,0,0,8294,0,0,0,0,0,0,0,40807,0,0,0,39398,8136,0,0,0,0
-,0,0,0,8875,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7941,0,0,25609,0,0,0,936,
-3716,3213,15687,0,0,0,0,0,52519,0,17381,0,0,0,0,1320,5797,0,21029,0,0,6472,807,0
-,0,0,0,0,0,0,0,0,0,13545,0,0,0,3624,0,0,0,29674,30820,0,31237,0,6596,0,0,0,0,0,0
-,0,0,0,64070,0,0,0,0,0,0,0,0,0,0,0,22278,0,37446,0,0,0,0,7240,423,0,24612,21705,
-17636,0,0,0,0,0,0,1833,0,0,0,328,6021,0,0,0,19974,0,0,0,0,0,0,0,0,0,62119,4178,0
-,0,0,0,12100,8617,0,0,16900,0,36678,0,0,0,35366,0,51718,0,0,0,0,0,0,0,0,0,0,0,0,
-0,0,0,20998,0,62086,0,0,0,0,0,5542,0,0,0,0,0,0,0,0,0,0,0,14629,10952,25927,0,0,0
-,0,19849,0,0,0,0,0,0,0,30952,3046,14314,12998,0,0,0,15268,0,40582,30216,62118,0,
-0,0,20132,0,0,0,0,0,12005,0,0,0,52358,0,0,0,0,24778,0,44,33095,0,0,0,0,0,26372,0
-,0,0,0,0,3781,0,0,17928,9479,0,0,0,0,0,0,0,0,32297,28613,0,0,0,0,0,0,0,0,0,0,0,0
-,0,47174,11723,0,0,0,0,0,0,0,0,0,2536,55143,0,0,6410,0,0,0,0,0,0,0,0,56294,11914
-,0,529,0,30184,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8261,0,0,28808,58854,22633,
-965,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,64135,0,0,331,3684,0,1605,0,0,0,0,0,0,
-0,0,0,0,16650,37,0,23622,3144,15429,0,0,0,0,0,0,0,0,0,0,22443,69,0,0,0,0,0,0,0,0
-,17832,0,0,0,0,0,0,0,0,0,11113,0,0,0,0,18309,0,0,0,0,0,0,0,0,0,26630,0,0,25512,
-25895,0,0,0,0,0,0,0,0,0,0,0,16901,0,0,0,27558,0,0,9418,0,0,0,3508,0,0,0,0,0,0,0,
-0,37990,9289,8517,0,0,0,0,1578,1604,23944,0,0,14916,12781,0,0,0,0,0,0,0,12105,0,
-16617,0,0,0,0,0,0,0,0,0,0,0,0,21348,11240,28870,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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-16324,25898,935,8333,0,0,0,0,0,0,0,0,18246,0,18086,0,46854,0,0,0,0,0,0,339,0,0,
-25188,12780,12166,6409,0,0,0,0,16516,0,27012,28395,0,0,0,0,0,0,0,1420,0,0,0,9768
-,52967,0,0,0,0,0,0,0,0,0,0,0,0,0,0,25163,324,0,0,0,0,0,0,0,0,0,64998,0,0,0,0,0,
-21893,0,0,0,0,0,47366,0,0,0,870,0,0,0,12646,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,26020,16360,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1809,0,0,0,6601,15878,0,0,0,0,0,
-29092,0,28516,0,0,0,0,0,0,0,0,0,21988,0,0,0,42950,0,0,0,0,0,0,0,0,0,0,5133,1318,
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-,0,10062,9412,0,0,0,31460,5708,6181,0,0,0,0,0,0,0,0,0,5575,0,0,0,0,0,0,0,0,0,0,
-27144,57478,0,0,0,0,0,0,7084,0,21993,53126,0,0,0,0,8397,0,0,5733,0,0,0,0,0,2116,
-0,24742,0,11271,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1133,0,4873,0,0,38310,0,0,0,0,0,
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-26214,0,0,0,0,0,0,0,0,23016,17415,20392,164,0,0,0,0,0,0,0,0,0,0,0,3239,0,46119,0
-,0,0,28580,0,0,0,0,0,0,0,0,0,7621,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,41478,0,0,31016,
-55334,10056,1924,0,0,0,0,0,36614,0,36711,0,0,0,0,0,0,0,0,0,0,13994,59303,0,0,0,0
-,0,0,0,0,0,0,0,0,0,0,0,26501,0,5639,0,0,0,0,0,0,13897,1253,0,0,0,0,0,5095,0,0,0,
-28869,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8646,0,0,0,0,25641,17796,0,0,0,0,0,0,0,
-13316,620,6309,11819,0,0,0,0,0,0,0,0,0,904,1095,0,24229,0,0,28744,49703,0,23077,
-0,0,0,0,32392,0,0,0,0,35271,0,28740,5866,0,0,0,0,0,0,0,4361,0,0,0,0,0,0,0,0,0,0,
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-0,41958,0,0,0,0,0,0,6766,13989,0,0,0,903,0,0,24010,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-,0,0,0,0,0,64390,0,22468,0,25861,0,0,0,0,23656,5317,0,0,0,0,0,0,23017,5445,16009
-,0,0,0,0,0,0,0,0,48006,10473,0,0,14404,0,0,0,42183,0,0,0,51270,0,0,10602,24132,0
-,0,0,0,0,43782,0,0,17834,0,0,0,25576,27205,0,0,0,0,0,0,0,0,29066,0,0,0,0,0,626,
-1988,14700,0,0,0,0,0,0,0,0,0,0,0,0,57670,0,0,0,0,0,0,0,0,0,44710,0,0,0,0,3848,
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-,0,0,0,0,0,0,0,0,19685,0,0,0,0,0,0,0,0,0,0,0,0,0,39783,0,0,0,0,30984,0,0,0,0,0,0
-,28230,0,0,0,29028,10538,3205,0,0,0,0,0,0,0,0,0,0,0,5636,840,295,0,0,8488,8198,0
-,0,0,0,0,0,0,0,0,20580,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4074,19526,0,0,0,0,
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-25288,0,12076,2054,0,48934,0,0,0,0,16969,59431,17259,35335,0,0,0,0,0,0,0,0,0,0,0
-,0,31275,0,0,0,1097,0,0,0,0,0,0,0,0,0,0,0,776,839,0,0,29386,0,0,0,0,0,0,0,0,0,0,
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-,0,0,0,0,0,0,0,0,0,24678,0,0,0,63335,0,28836,8142,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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-,0,12522,0,0,62471,0,0,0,0,0,0,0,0,0,0,4046,0,0,0,0,20486,0,15460,2217,51719,0,0
-,0,0,0,23495,0,0,0,0,0,0,15370,0,15849,0,15113,0,0,0,0,0,0,0,0,27972,7337,0,0,0,
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-,0,0,0,17256,35751,0,0,0,0,0,0,0,0,8236,0,32108,0,0,0,43,14342,0,16517,0,0,30732
-,0,4012,133,0,40583,971,23942,0,0,27275,0,0,0,204,0,0,27140,7564,44327,27592,
-57958,0,0,0,0,22344,25701,0,0,0,0,0,0,0,19524,31755,0,0,28102,0,59111,0,0,0,0,0,
-0,0,12261,0,44934,0,0,0,0,31560,0,11114,0,0,0,0,0,0,0,0,0,0,0,18953,18311,0,
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-453,17323,0,20328,4036,0,0,0,15844,0,0,0,0,27561,31940,32296,0,0,0,0,0,0,0,11499
-,11782,0,0,0,0,9738,50471,0,0,0,0,0,35430,0,0,0,0,0,29734,0,0,0,36551,0,0,0,0,
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-0,17896,56038,4077,0,0,0,29899,37351,0,30823,0,8326,0,0,0,18342,0,0,0,0,0,0,0,0,
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-,0,0,0,0,0,0,36486,0,0,0,0,10889,9607,0,28711,0,0,0,0,0,0,0,0,0,0,28490,0,0,0,0,
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-,0,9128,1125,0,16548,0,0,0,0,0,0,0,0,0,0,17292,6854,21352,0,2380,0,0,4007,0,0,0,
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-,0,0,0,26728,0,567,48839,0,0,0,0,0,15271,0,0,31818,43974,2450,0,0,0,0,0,0,0,
-11368,9191,0,44454,0,0,0,0,0,0,14568,12293,0,0,0,8453,0,0,0,0,0,0,0,0,0,0,0,0,
-32040,0,0,0,0,0,0,0,0,0,0,0,0,902,0,0,0,27236,5612,11495,0,0,0,0,0,0,0,0,9194,
-23684,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,27430,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-26217,44870,0,0,0,0,0,0,5581,7173,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-52775,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,20968,18340,0,0,0,0,0,0,0,0,4107,11239
-,0,0,0,0,0,0,0,0,0,0,0,29381,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,21990,0,0,0,0
-,0,0,0,0,0,48806,0,0,0,32292,0,0,0,0,0,0,0,10884,0,0,0,0,0,0,0,0,0,0,27562,0,
-5643,0,0,0,0,0,0,0,0,0,3089,31525,0,19684,0,0,0,0,0,0,0,61415,0,0,0,0,0,36198,0,
-0,0,0,0,0,0,7908,0,0,0,0,872,743,0,0,0,0,0,0,0,0,1229,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,0,0,0,0,0,0,32484,0,0,0,0,0,34822,0,0,0,0,0,50726,0,0,0,0,7274,0,0,0,15304,
-11526,0,0,0,3047,0,0,0,0,0,0,22376,0,0,0,846,0,0,0,0,35815,0,0,0,23652,0,0,0,0,0
-,0,0,0,0,0,0,0,0,0,0,0,23721,2148,0,0,0,0,0,0,14856,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,0,0,0,0,0,0,1358,0,3082,0,0,0,848,10949,0,0,0,0,0,0,6504,0,0,14372,0,0,0,0,0,0
-,0,0,0,0,8201,9958,0,0,0,0,0,0,24266,0,0,0,0,0,0,0,0,26469,0,0,0,0,18604,2053,0,
-33511,0,0,0,0,0,9222,0,0,0,0,0,44006,0,0,0,0,0,0,0,0,0,0,0,41895,0,0,0,0,0,0,0,0
-,12044,390,0,0,0,0,0,4935,0,48646,0,56102,3052,16070,0,0,0,0,0,0,0,8612,9320,
-38311,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,500,0,0,0,0,42918,0,
-32550,0,0,0,0,0,0,0,0,27434,57926,17064,0,0,46502,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,0,0,0,0,26760,6756,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,624,0,5000,0,0,0,0,32293,0,
-0,0,0,0,0,0,0,0,0,0,0,0,26246,0,0,0,0,0,0,0,0,23,7301,0,0,0,36199,0,40838,0,0,0,
-0,0,0,0,0,0,0,0,0,27178,57350,0,0,12457,9317,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,16810,0,0,0,14510,0,0,0,0,21319,0,0,0,13508,17,
-11365,0,0,0,0,5291,0,8329,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,27685,0,0,0,0,0,0,0,
-52006,0,0,0,7493,0,44263,0,0,0,0,0,0,0,0,9800,0,0,0,25676,61478,0,0,0,0,0,0,5773
-,0,0,0,0,41991,26057,0,0,0,0,0,0,0,0,0,0,22629,0,0,0,47783,362,1959,23468,0,0,0,
-10921,0,0,0,3150,0,0,0,0,0,0,0,0,0,0,0,32456,0,0,0,0,0,0,0,4559,3270,0,0,983,0,0
-,26343,0,33446,0,0,0,61767,0,48390,0,0,0,0,0,0,0,2790,0,39782,7849,0,0,0,0,0,0,0
-,1544,2183,0,0,0,0,0,0,0,0,4040,2471,20009,30020,0,0,11242,0,0,0,5578,53382,0,
-22631,0,0,0,0,0,0,0,0,0,0,0,12901,0,0,0,0,0,0,0,0,0,0,0,0,215,0,0,9030,0,0,0,0,0
-,0,265,1412,0,0,11626,3687,0,0,0,0,0,0,0,0,0,0,0,0,17449,24359,0,0,26729,40134,0
-,0,0,0,29768,61958,0,0,0,0,0,0,0,0,20908,0,0,0,0,0,11016,0,0,47462,21547,5926,0,
-0,14728,2983,24104,15301,0,0,0,0,0,32645,0,0,0,0,0,0,0,3300,0,0,0,15972,0,0,0,0,
-0,0,6634,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3076,0,30983,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,106,0,0,0,0,12775,0,0,0,0,7177,18022,0,0,0,0,0,22534,0,0,0,0,0,0,0,0,0,0,0,
-49894,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,27560,0,0,0,0,30278,10668,23877,0,
-0,0,0,0,0,0,29124,0,0,0,0,0,0,0,0,0,0,0,0,0,20870,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,0,0,0,44582,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,48454,0,0,0,0,6442,0,16330,22951,0,0
-,16904,0,0,0,0,644,0,0,0,40038,0,0,0,37222,0,0,0,9830,0,0,0,0,0,34919,0,0,0,0,0,
-0,0,0,0,0,0,13733,0,0,0,28196,0,0,0,0,0,19876,0,0,0,0,0,0,0,23558,0,11142,0,
-27781,0,0,0,0,13864,0,0,0,24682,47847,0,0,0,0,6890,0,0,0,0,0,3981,0,0,0,0,0,0,0,
-0,0,0,0,1772,0,0,0,0,0,0,0,3603,1991,0,27396,8652,0,18312,0,0,0,0,30054,0,0,0,0,
-0,0,0,11270,0,0,0,0,0,0,0,0,0,20708,0,0,0,0,338,0,0,0,0,0,0,0,7050,0,0,0,0,0,0,0
-,0,0,0,0,0,0,14862,0,0,3492,0,0,0,55878,0,0,0,16486,0,0,0,18119,0,0,0,0,0,0,2154
-,1284,0,0,23113,31751,0,0,29547,0,0,0,0,0,0,36647,0,0,0,0,0,0,0,0,0,0,0,18183,0,
-0,0,0,0,0,0,0,0,0,0,0,0,0,7913,0,0,0,0,20644,0,0,10508,0,0,0,0,0,0,0,0,0,0,0,0,
-43622,0,0,0,0,0,40966,0,0,0,0,0,0,0,0,0,0,246,901,11529,5191,0,0,0,0,0,0,0,0,0,0
-,0,24454,0,0,26665,27590,0,27397,0,0,0,0,0,0,23562,2949,0,0,30344,62214,0,47334,
-2026,18885,0,0,0,48678,0,0,0,22694,0,0,1972,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-0,0,0,0,0,0,0,15465,0,0,0,0,38822,0,0,0,0,945,32708,0,54791,0,14918,0,0,0,0,0,0,
-0,0,0,0,0,0,0,23396,0,0,0,0,0,0,5486,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7722,0,0,
-0,0,0,0,0,0,0,0,0,30856,64166,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,35206,0,0,0,30535,0,
-0,0,0,0,0,0,0,0,62663,0,0,1096,17574,31820,0,0,14375,4402,27207,0,0,21448,4676,0
-,0,0,0,16585,5094,0,0,0,0,0,0,0,0,4845,0,0,32870,0,0,0,0,0,0,0,0,0,0,31466,0,0,0
-,0,31783,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4522,16039,0,0,0,0,0,0,0,0,
-0,14469,0,0,0,0,0,0,0,0,0,0,7464,4773,0,0,0,0,0,0,0,0,18636,0,0,0,25640,0,0,0,0,
-0,0,2244,0,0,11818,0,1168,0,0,0,0,0,0,0,6540,23079,13770,7719,0,0,0,0,0,0,0,0,0,
-0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,58150,528,
-34502,32682,0,0,12997,0,0,0,0,0,2214,0,0,0,0,0,58567,0,0,0,26375,0,0,0,0,0,0,0,0
-,0,26437,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,26121,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-,0,32005,22952,59047,0,13543,0,0,0,0,0,0,0,0,16328,0,0,33542,0,0,0,19782,0,0,0,
-16644,0,0,0,0,31688,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10276,0,0,0,
-0,0,0,0,36327,0,0,29480,0,0,0,777,12709,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,27398,0,0,
-0,4455,9037,31397,0,9221,0,0,0,60487,20840,1796,0,0,0,0,0,0,0,0,8364,0,0,0,0,0,0
-,0,0,0,0,0,19752,44902,0,38566,0,0,18027,0,0,0,0,0,0,0,0,10662,0,0,0,0,0,11812,0
-,0,0,0,0,0,0,0,0,19910,0,0,0,45030,0,0,0,0,0,0,0,0,0,0,0,0,19978,5127,0,11620,0,
+BROTLI_INTERNAL const uint16_t kStaticDictionaryHashWords[32768] = {
+1002,0,0,0,0,0,0,0,0,683,0,0,0,0,0,0,0,1265,0,0,0,0,0,1431,0,0,0,0,0,0,40,0,0,0,
+0,155,8,741,0,624,0,0,0,0,0,0,0,0,0,0,0,0,66,503,0,0,0,451,0,0,0,0,0,0,0,835,70,
+0,0,539,0,0,0,0,0,0,0,0,0,113,0,0,0,0,718,0,0,0,0,0,0,520,0,1070,0,0,0,0,0,1515,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,78,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,610,0,0,750,0,0,0,307,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,964,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,999,0,0,0,0,0,0,0,0,
+645,75,0,649,52,282,0,200,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1621,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,211,225,0,0,687,718,0,0,110,0,58,0,0,0,0,0,0,345,0,0,301,0,0,
+0,203,0,0,1154,674,1949,0,0,0,0,0,0,0,0,0,259,0,0,0,0,0,0,0,1275,0,0,0,1231,254,
+0,0,0,0,0,0,0,277,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,248,0,0,800,0,0,0,29,
+116,100,490,0,0,0,0,0,1641,0,543,0,0,0,0,41,181,0,657,0,0,202,25,0,0,0,0,0,0,0,
+0,0,0,423,0,0,0,113,0,0,0,927,963,0,976,0,206,0,0,0,0,0,0,0,0,0,2002,0,0,0,0,0,
+0,0,0,0,0,0,696,0,1170,0,0,0,0,226,13,0,769,678,551,0,0,0,0,0,0,57,0,0,0,10,188,
+0,0,0,624,0,0,0,0,0,0,0,0,0,1941,130,0,0,0,0,378,269,0,0,528,0,1146,0,0,0,1105,
+0,1616,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,656,0,1940,0,0,0,0,0,173,0,0,0,0,0,0,0,0,0,
+0,0,457,342,810,0,0,0,0,620,0,0,0,0,0,0,0,967,95,447,406,0,0,0,477,0,1268,944,
+1941,0,0,0,629,0,0,0,0,0,375,0,0,0,1636,0,0,0,0,774,0,1,1034,0,0,0,0,0,824,0,0,
+0,0,0,118,0,0,560,296,0,0,0,0,0,0,0,0,1009,894,0,0,0,0,0,0,0,0,0,0,0,0,0,1474,
+366,0,0,0,0,0,0,0,0,0,79,1723,0,0,200,0,0,0,0,0,0,0,0,1759,372,0,16,0,943,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,258,0,0,900,1839,707,30,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,2004,0,0,10,115,0,50,0,0,0,0,0,0,0,0,0,0,520,1,0,738,98,482,0,0,0,0,
+0,0,0,0,0,0,701,2,0,0,0,0,0,0,0,0,557,0,0,0,0,0,0,0,0,0,347,0,0,0,0,572,0,0,0,0,
+0,0,0,0,0,832,0,0,797,809,0,0,0,0,0,0,0,0,0,0,0,528,0,0,0,861,0,0,294,0,0,0,109,
+0,0,0,0,0,0,0,0,1187,290,266,0,0,0,0,49,50,748,0,0,466,399,0,0,0,0,0,0,0,378,0,
+519,0,0,0,0,0,0,0,0,0,0,0,0,667,351,902,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,180,
+0,0,869,0,0,0,0,0,0,0,260,0,0,0,0,0,0,0,0,0,0,523,36,0,0,587,510,809,29,260,0,0,
+0,0,0,0,0,0,570,0,565,0,1464,0,0,0,0,0,0,10,0,0,787,399,380,200,0,0,0,0,516,0,
+844,887,0,0,0,0,0,0,0,44,0,0,0,305,1655,0,0,0,0,0,0,0,0,0,0,0,0,0,0,786,10,0,0,
+0,0,0,0,0,0,0,2031,0,0,0,0,0,684,0,0,0,0,0,1480,0,0,0,27,0,0,0,395,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,813,511,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,56,0,0,0,206,
+496,0,0,0,0,0,909,0,891,0,0,0,0,0,0,0,0,0,687,0,0,0,1342,0,0,0,0,0,0,0,0,0,0,
+160,41,0,0,0,0,0,0,0,0,0,0,0,1718,778,0,0,0,0,0,0,0,0,0,0,1610,0,0,0,0,0,115,0,
+0,0,0,314,294,0,0,0,983,178,193,0,0,0,0,0,0,0,0,0,174,0,0,0,0,0,0,0,0,0,0,848,
+1796,0,0,0,0,0,0,221,0,687,1660,0,0,0,0,262,0,0,179,0,0,0,0,0,66,0,773,0,352,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,35,0,152,0,0,1197,0,0,0,0,0,0,0,0,0,0,0,0,560,0,0,
+564,0,0,0,797,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,556,0,819,0,0,0,0,0,0,0,0,719,544,
+637,5,0,0,0,0,0,0,0,0,0,0,0,101,0,1441,0,0,0,893,0,0,0,0,0,0,0,0,0,238,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,1296,0,0,969,1729,314,60,0,0,0,0,0,1144,0,1147,0,0,0,0,0,
+0,0,0,0,0,437,1853,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,828,0,176,0,0,0,0,0,0,434,39,0,
+0,0,0,0,159,0,0,0,902,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,270,0,0,0,0,801,556,0,0,
+0,0,0,0,0,416,19,197,369,0,0,0,0,0,0,0,0,0,28,34,0,757,0,0,898,1553,0,721,0,0,0,
+0,1012,0,0,0,0,1102,0,898,183,0,0,0,0,0,0,0,136,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,247,277,0,0,0,435,0,0,0,0,0,1311,0,0,0,0,
+0,0,211,437,0,0,0,28,0,0,750,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2012,0,702,
+0,808,0,0,0,0,739,166,0,0,0,0,0,0,719,170,500,0,0,0,0,0,0,0,0,1500,327,0,0,450,
+0,0,0,1318,0,0,0,1602,0,0,331,754,0,0,0,0,0,1368,0,0,557,0,0,0,799,850,0,0,0,0,
+0,0,0,0,908,0,0,0,0,0,19,62,459,0,0,0,0,0,0,0,0,0,0,0,0,1802,0,0,0,0,0,0,0,0,0,
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+0,0,0,0,0,0,0,0,0,0,0,0,0,0,391,0,0,0,0,0,0,0,0,0,0,0,0,668,883,0,78,628,0,0,0,
+0,0,0,0,0,0,0,0,0,1460,0,962,0,0,0,0,0,460,0,0,0,0,0,0,0,0,0,0,0,0,0,0,34,199,0,
+0,0,388,474,0,271,0,333,608,0,0,0,0,0,0,49,0,988,0,707,617,0,0,0,0,0,0,0,756,0,
+0,0,0,0,1583,0,0,0,0,0,0,0,0,0,0,285,0,0,0,0,0,0,0,0,0,0,0,0,0,0,344,0,0,0,0,0,
+0,0,0,515,1709,0,0,0,0,0,0,0,0,404,0,0,0,0,500,0,0,0,0,0,0,0,0,0,68,216,0,0,0,0,
+0,0,0,488,353,0,0,177,236,0,0,458,490,0,0,0,0,0,0,756,1504,0,757,0,1735,0,0,108,
+598,0,0,0,0};
+BROTLI_INTERNAL const uint8_t kStaticDictionaryHashLengths[32768] = {
+8,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,6,0,0,0,0,0,6,0,0,0,0,0,0,12,0,0,0,0,4,22,5,0,
+4,0,0,0,0,0,0,0,0,0,0,0,0,14,6,0,0,0,5,0,0,0,0,0,0,0,7,13,0,0,4,0,0,0,0,0,0,0,0,
+0,6,0,0,0,0,8,0,0,0,0,0,0,7,0,7,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,12,0,0,4,0,0,0,4,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,10,4,0,5,13,7,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9,6,0,0,8,7,0,0,9,0,8,0,0,0,0,0,0,6,0,
+0,9,0,0,0,11,0,0,6,8,7,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,7,0,0,0,6,8,0,0,0,0,0,
+0,0,11,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,9,0,0,0,8,4,13,7,0,0,0,0,0,
+7,0,5,0,0,0,0,8,5,0,5,0,0,8,7,0,0,0,0,0,0,0,0,0,0,9,0,0,0,8,0,0,0,10,4,0,5,0,4,
+0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,6,0,6,0,0,0,0,8,7,0,4,9,4,0,0,0,0,0,0,
+9,0,0,0,8,5,0,0,0,6,0,0,0,0,0,0,0,0,0,7,18,0,0,0,0,4,9,0,0,4,0,6,0,0,0,6,0,6,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,6,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,5,8,7,0,0,0,
+0,9,0,0,0,0,0,0,0,8,6,10,6,0,0,0,4,0,6,8,6,0,0,0,4,0,0,0,0,0,5,0,0,0,6,0,0,0,0,
+10,0,12,7,0,0,0,0,0,4,0,0,0,0,0,5,0,0,8,7,0,0,0,0,0,0,0,0,9,5,0,0,0,0,0,0,0,0,0,
+0,0,0,0,6,11,0,0,0,0,0,0,0,0,0,8,7,0,0,10,0,0,0,0,0,0,0,0,6,10,0,17,0,8,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,8,6,9,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+7,0,0,11,4,0,5,0,0,0,0,0,0,0,0,0,0,10,5,0,6,8,5,0,0,0,0,0,0,0,0,0,0,11,5,0,0,0,
+0,0,0,0,0,8,0,0,0,0,0,0,0,0,0,9,0,0,0,0,5,0,0,0,0,0,0,0,0,0,6,0,0,8,7,0,0,0,0,0,
+0,0,0,0,0,0,5,0,0,0,6,0,0,10,0,0,0,20,0,0,0,0,0,0,0,0,6,9,5,0,0,0,0,10,4,8,0,0,
+4,13,0,0,0,0,0,0,0,9,0,9,0,0,0,0,0,0,0,0,0,0,0,0,4,8,6,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,12,0,0,4,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,12,5,0,0,10,4,10,7,13,
+0,0,0,0,0,0,0,0,6,0,6,0,6,0,0,0,0,0,0,19,0,0,4,12,6,9,0,0,0,0,4,0,4,11,0,0,0,0,
+0,0,0,12,0,0,0,8,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,11,4,0,0,0,0,0,0,0,0,0,6,0,0,0,0,
+0,5,0,0,0,0,0,6,0,0,0,6,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,8,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,17,0,0,0,9,6,0,0,0,0,0,4,0,4,0,0,0,0,0,0,0,0,0,4,0,0,0,
+6,0,0,0,0,0,0,0,0,0,0,13,6,0,0,0,0,0,0,0,0,0,0,0,6,8,0,0,0,0,0,0,0,0,0,0,6,0,0,
+0,0,0,5,0,0,0,0,14,4,0,0,0,4,12,5,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,8,6,0,
+0,0,0,0,0,12,0,9,6,0,0,0,0,13,0,0,5,0,0,0,0,0,4,0,6,0,7,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,13,0,9,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,12,0,0,5,0,0,0,6,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,6,0,6,0,0,0,0,0,0,0,0,8,7,8,4,0,0,0,0,0,0,0,0,0,0,0,7,0,7,0,0,0,4,0,
+0,0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,8,6,8,4,0,0,0,0,0,6,0,7,0,
+0,0,0,0,0,0,0,0,0,10,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,7,0,0,0,0,0,0,9,5,0,0,
+0,0,0,7,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,9,4,0,0,0,0,0,0,0,4,
+12,5,11,0,0,0,0,0,0,0,0,0,8,7,0,5,0,0,8,7,0,5,0,0,0,0,8,0,0,0,0,7,0,4,10,0,0,0,
+0,0,0,0,9,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+13,5,0,0,0,4,0,0,0,0,0,6,0,0,0,0,0,0,14,5,0,0,0,7,0,0,10,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,6,0,4,0,5,0,0,0,0,8,5,0,0,0,0,0,0,9,5,9,0,0,0,0,0,0,0,0,6,9,0,
+0,4,0,0,0,7,0,0,0,6,0,0,10,4,0,0,0,0,0,6,0,0,10,0,0,0,8,5,0,0,0,0,0,0,0,0,10,0,
+0,0,0,0,18,4,12,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,6,0,0,0,0,8,7,0,0,0,
+0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,8,4,0,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,0,
+0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,8,0,0,0,0,0,0,6,0,0,0,4,10,5,0,0,0,0,0,0,0,0,0,0,
+0,4,8,7,0,0,8,6,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,6,0,
+0,0,0,8,6,0,0,0,0,0,0,12,0,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,0,0,6,0,7,0,0,0,0,0,0,
+0,0,0,0,0,6,0,0,0,7,0,0,0,0,0,0,8,7,0,0,0,0,8,0,12,6,0,6,0,0,0,0,9,7,11,7,0,0,0,
+0,0,0,0,0,0,0,0,0,11,0,0,0,9,0,0,0,0,0,0,0,0,0,0,0,8,7,0,0,10,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,8,6,0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,
+0,0,0,6,0,0,0,7,0,4,14,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,14,0,0,0,0,0,8,4,0,4,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,20,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,12,5,0,7,0,5,0,0,10,0,0,7,0,0,0,0,0,0,0,0,0,0,14,0,0,0,0,6,0,4,9,7,0,0,0,
+0,0,7,0,0,0,0,0,0,10,0,9,0,9,0,0,0,0,0,0,0,0,4,9,0,0,0,0,6,0,0,0,0,0,0,0,0,11,4,
+0,6,0,0,0,0,0,0,8,0,8,0,0,0,0,0,0,0,0,0,0,4,0,0,0,5,0,0,0,0,0,0,0,0,13,6,0,0,11,
+0,0,0,0,0,0,0,9,7,0,0,0,0,0,0,0,0,0,0,0,6,18,0,0,4,0,0,0,0,0,0,0,6,0,0,0,0,0,0,
+0,5,0,0,0,0,0,0,0,0,9,7,0,0,0,0,0,0,0,6,0,0,0,0,9,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,11,7,0,0,0,0,0,6,0,0,0,7,0,0,0,0,0,0,0,0,11,
+4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0,4,0,0,0,0,8,
+6,0,0,0,0,0,0,9,6,0,0,0,0,0,4,0,0,0,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,19,0,0,0,
+0,6,0,6,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,6,0,6,0,0,10,6,0,0,0,7,0,0,8,0,8,7,0,
+0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,6,20,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,9,0,0,0,0,6,0,0,0,0,0,0,0,5,0,0,18,0,0,0,0,0,0,0,0,0,0,0,0,0,9,6,0,
+0,0,0,8,7,0,0,0,0,0,0,0,0,12,0,12,0,0,0,11,6,0,5,0,0,12,0,12,5,0,7,11,6,0,0,11,
+0,0,0,12,0,0,4,12,7,8,6,0,0,0,0,8,5,0,0,0,0,0,0,0,4,11,0,0,6,0,7,0,0,0,0,0,0,0,
+5,0,6,0,0,0,0,8,0,10,0,0,0,0,0,0,0,0,0,0,0,9,7,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,11,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,
+0,0,0,0,0,0,0,0,0,11,7,0,0,0,0,0,0,10,0,0,5,0,0,12,6,0,0,0,0,0,0,10,6,0,0,0,0,8,
+6,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,5,0,0,0,0,11,0,10,6,0,0,8,6,0,0,0,6,0,7,10,6,0,
+0,0,7,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,10,7,0,0,0,0,
+10,6,0,0,0,0,0,0,8,5,11,0,8,4,0,0,0,4,0,0,0,0,9,4,8,0,0,0,0,0,0,0,11,6,0,0,0,0,
+10,7,0,0,0,0,0,6,0,0,0,0,0,6,0,0,0,7,0,0,0,0,9,6,0,5,0,7,0,0,0,0,0,7,0,0,11,0,0,
+0,0,0,0,0,0,0,0,0,0,0,12,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,
+0,0,0,0,13,0,8,6,13,0,0,0,11,7,0,7,0,6,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,9,6,0,0,0,0,0,0,0,0,0,6,0,0,9,6,0,6,0,0,0,0,0,5,0,0,0,0,0,0,0,0,
+0,0,0,0,0,5,9,0,0,0,0,0,0,0,0,0,0,4,9,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,9,7,0,7,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,
+5,11,5,0,0,0,0,0,0,0,0,0,4,0,7,0,6,0,0,0,6,20,0,0,0,10,7,0,5,14,4,0,0,0,0,0,0,0,
+0,0,6,0,0,0,0,8,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9,0,0,0,0,0,0,0,0,0,0,
+0,0,6,0,4,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,9,7,0,0,11,6,15,0,0,0,0,0,
+10,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,14,7,0,0,0,0,0,0,0,0,9,7,13,0,0,0,0,0,
+0,7,0,0,8,6,0,0,0,0,0,0,0,0,9,4,0,0,0,0,8,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,5,0,0,0,0,0,0,0,0,0,0,0,0,8,5,0,4,0,0,0,0,0,0,0,0,0,0,12,6,8,0,12,0,0,7,0,0,0,
+0,0,5,10,0,0,0,0,0,0,0,0,0,0,0,0,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,
+14,0,0,0,0,0,0,0,0,0,0,0,0,5,0,5,8,7,10,7,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,6,18,6,
+14,7,0,0,0,0,0,0,0,0,11,6,0,0,0,0,8,7,0,0,0,0,0,0,0,0,0,0,12,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,6,0,0,0,0,0,0,0,6,0,0,11,7,0,0,10,7,0,0,0,6,8,6,0,0,0,0,0,0,0,6,0,0,
+19,0,0,0,9,5,0,0,0,0,0,0,11,7,0,0,0,7,0,6,0,0,11,0,0,0,0,4,8,0,0,0,0,0,0,0,0,6,
+0,0,0,0,0,6,0,0,8,4,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,7,
+0,7,0,0,0,7,15,0,0,5,0,0,0,0,10,0,0,0,0,0,0,0,0,0,12,0,0,0,0,0,0,0,0,0,0,7,0,0,
+0,0,0,0,0,0,9,6,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+11,7,0,0,0,0,0,0,0,6,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,
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+0,0,0,0,0,4,9,6,13,0,0,0,0,0,0,0,0,6,0,0,0,6,0,0,0,5,0,0,0,0,0,0,8,0,0,0,0,0,0,
+0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,6,0,0,11,0,9,0,0,0,0,4,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,8,5,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,19,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,
+0,4,0,5,0,0,0,0,0,0,0,0,0,4,0,0,0,0,9,7,8,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,
+0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,6,
+0,0,0,0,8,7,0,0,0,0,0,0,12,0,0,6,0,0,0,0,0,0,0,6,8,4,0,0,10,7,0,0,10,0,0,0,0,0,
+0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0,7,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,4,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,9,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9,7,0,0,0,0,0,0,0,5,
+0,4,0,0,0,0,0,6,0,0,0,0,0,0,8,0,0,6,0,0,0,6,0,0,0,0,0,7,0,5,8,4,0,0,9,0,0,0,0,4,
+0,0,0,0,0,0,0,0,0,5,0,0,15,6,8,6,0,0,0,6,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,6,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,9,6,0,0,0,0,0,0,0,7,0,0,0,4,0,
+6,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,6,0,0,0,0,0,0,11,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,9,5,0,6,12,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,11,6,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,8,7,0,6,0,0,0,0,0,0,0,0,0,0,0,0,11,0,12,7,0,0,0,0,
+0,0,0,0,0,5,0,5,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,11,4,0,0,0,0,0,0,0,0,0,0,10,
+7,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,7,8,7,9,6,0,0,0,0,0,0,0,0,8,6,0,0,0,0,0,5,12,0,
+10,5,12,6,0,0,0,7,0,0,0,0,0,0,0,5,0,0,0,5,9,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,
+11,7,0,0,0,0,0,0,0,0,0,0,17,0,0,0,0,0,0,6,0,7,0,0,0,0,8,0,8,5,0,6,0,0,0,6,0,0,0,
+0,0,0,0,6,0,6,0,6,9,0,0,5,17,0,0,0,0,0,0,0,0,0,0,0,0,0,9,0,0,0,0,0,0,0,0,7,0,0,
+0,0,0,7,0,0,0,0,16,5,0,0,0,0,0,0,0,4,0,0,0,5,11,5,0,7,0,0,0,4,8,7,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,11,7,0,0,0,0,12,0,0,0,
+0,0,12,0,0,0,0,0,0,0,0,4,10,4,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,6,0,0,0,0,0,0,0,4,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,11,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,20,5,0,0,
+10,0,0,0,0,0,0,0,0,0,0,6,0,0,0,6,12,0,0,0,0,0,0,6,0,0,0,0,0,0,9,4,10,7,0,4,0,0,
+0,0,0,0,10,6,0,0,0,0,8,4,0,7,8,6,0,6,8,0,10,0,0,0,0,0,13,5,0,6,0,0,0,0,0,0,22,4,
+0,0,0,0,0,0,0,0,0,0,9,0,0,0,0,6,0,0,0,6,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,6,10,
+5,8,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,0,10,4,0,0,10,7,0,0,0,0,0,5,0,
+5,8,0,0,0,0,6,0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,10,7,0,0,0,4,0,0,0,0,0,6,0,0,
+0,0,0,0,0,0,8,7,0,0,0,0,0,0,0,0,0,0,0,0,11,0,0,0,0,7,0,0,0,6,0,0,0,0,0,0,0,0,0,
+4,0,0,0,4,10,0,0,6,13,7,8,0,0,0,0,0,0,7,0,0,12,7,0,0,0,0,0,0,10,5,0,0,0,0,0,6,0,
+0,0,0,0,0,0,0,0,0,13,7,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,6,0,0,0,0,0,0,0,0,8,6,0,6,
+0,0,0,0,0,0,0,0,12,0,8,4,0,0,0,0,0,4,0,4,0,0,0,0,0,0,0,5,0,0,0,0,12,5,0,0,0,7,0,
+0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,6,10,0,0,0,20,0,0,5,0,0,10,
+7,11,7,0,0,0,0,0,0,0,0,0,0,17,0,9,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,10,7,0,4,0,6,0,0,24,0,0,5,0,0,0,0,8,0,0,
+0,0,0,0,0,10,5,0,4,0,6,0,0,8,0,0,0,0,0,0,4,0,6,0,0,0,0,0,0,9,5,0,0,0,0,0,0,0,0,
+0,0,0,6,0,0,0,0,9,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,4,0,7,
+0,0,13,0,0,0,0,0,0,0,11,6,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,0,
+17,7,0,0,11,6,0,0,0,0,12,6,0,0,0,6,0,6,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,5,0,0,0,6,0,0,0,0,0,0,0,0,0,0,10,0,0,4,8,6,0,0,0,
+0,0,0,9,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,9,5,0,7,18,0,0,0,0,0,0,0,0,0,0,0,0,0,8,6,0,0,0,0,0,0,0,0,8,0,0,0,
+0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,
+0,0,0,0,0,0,10,0,0,0,0,0,0,0,0,4,0,6,0,0,9,0,0,0,0,0,0,0,0,0,13,0,0,0,0,0,0,0,0,
+0,0,0,8,7,10,0,8,5,0,0,0,0,0,0,0,0,9,0,0,0,10,0,0,0,0,6,0,7,0,4,0,0,0,0,0,0,0,0,
+8,0,0,0,0,0,8,4,0,0,0,0,0,5,0,0,10,0,12,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+4,0,0,0,0,0,0,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,18,6,11,0,0,
+7,0,0,0,0,0,6,10,5,0,0,0,0,0,0,0,0,0,5,0,0,9,5,12,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,6,0,0,0,0,13,6,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,
+0,0,0,8,4,0,6,12,0,0,0,0,0,0,0,0,0,0,0,0,6,0,6,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,11,4,0,0,0,6,14,0,11,0,9,6,0,0,0,0,0,0,22,0,12,0,8,6,0,0,0,0,0,0,0,6,0,
+0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,11,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,
+10,7,0,0,0,0,0,0,0,0,9,0,0,0,0,4,0,0,0,0,0,0,0,0,0,5,11,0,0,0,0,0,0,0,8,6,0,0,9,
+7,0,0,12,4,0,0,0,0,0,0,12,6,0,6,0,7,0,0,8,5,0,0,0,0};
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
diff --git a/c/enc/dictionary_hash.h b/c/enc/dictionary_hash.h
index b3bb959..e553ea5 100644
--- a/c/enc/dictionary_hash.h
+++ b/c/enc/dictionary_hash.h
@@ -15,7 +15,8 @@
extern "C" {
#endif
-extern const uint16_t kStaticDictionaryHash[32768];
+extern const uint16_t kStaticDictionaryHashWords[32768];
+extern const uint8_t kStaticDictionaryHashLengths[32768];
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
diff --git a/c/enc/encode.c b/c/enc/encode.c
index ec56da2..e67ca44 100644
--- a/c/enc/encode.c
+++ b/c/enc/encode.c
@@ -21,6 +21,7 @@
#include "./brotli_bit_stream.h"
#include "./compress_fragment.h"
#include "./compress_fragment_two_pass.h"
+#include "./dictionary_hash.h"
#include "./encoder_dict.h"
#include "./entropy_encode.h"
#include "./fast_log.h"
@@ -710,7 +711,7 @@
params->lgblock = 0;
params->size_hint = 0;
params->disable_literal_context_modeling = BROTLI_FALSE;
- BrotliInitEncoderDictionary(¶ms->dictionary);
+ BrotliInitSharedEncoderDictionary(¶ms->dictionary);
params->dist.distance_postfix_bits = 0;
params->dist.num_direct_distance_codes = 0;
params->dist.alphabet_size =
@@ -718,6 +719,11 @@
params->dist.max_distance = BROTLI_MAX_DISTANCE;
}
+static void BrotliEncoderCleanupParams(MemoryManager* m,
+ BrotliEncoderParams* params) {
+ BrotliCleanupSharedEncoderDictionary(m, ¶ms->dictionary);
+}
+
static void BrotliEncoderInitState(BrotliEncoderState* s) {
BrotliEncoderInitParams(&s->params);
s->input_pos_ = 0;
@@ -789,6 +795,7 @@
BROTLI_FREE(m, s->large_table_);
BROTLI_FREE(m, s->command_buf_);
BROTLI_FREE(m, s->literal_buf_);
+ BrotliEncoderCleanupParams(m, &s->params);
}
/* Deinitializes and frees BrotliEncoderState instance. */
@@ -889,6 +896,8 @@
uint64_t cmd_dist = (uint64_t)s->dist_cache_[0];
uint32_t distance_code = CommandRestoreDistanceCode(last_command,
&s->params.dist);
+ const CompoundDictionary* dict = &s->params.dictionary.compound;
+ size_t compound_dictionary_size = dict->total_size;
if (distance_code < BROTLI_NUM_DISTANCE_SHORT_CODES ||
distance_code - (BROTLI_NUM_DISTANCE_SHORT_CODES - 1) == cmd_dist) {
if (cmd_dist <= max_distance) {
@@ -898,6 +907,39 @@
(*bytes)--;
(*wrapped_last_processed_pos)++;
}
+ } else {
+ if ((cmd_dist - max_distance - 1) < compound_dictionary_size &&
+ last_copy_len < cmd_dist - max_distance) {
+ size_t address =
+ compound_dictionary_size - (size_t)(cmd_dist - max_distance) +
+ (size_t)last_copy_len;
+ size_t br_index = 0;
+ size_t br_offset;
+ const uint8_t* chunk;
+ size_t chunk_length;
+ while (address >= dict->chunk_offsets[br_index + 1]) br_index++;
+ br_offset = address - dict->chunk_offsets[br_index];
+ chunk = dict->chunk_source[br_index];
+ chunk_length =
+ dict->chunk_offsets[br_index + 1] - dict->chunk_offsets[br_index];
+ while (*bytes != 0 && data[*wrapped_last_processed_pos & mask] ==
+ chunk[br_offset]) {
+ last_command->copy_len_++;
+ (*bytes)--;
+ (*wrapped_last_processed_pos)++;
+ if (++br_offset == chunk_length) {
+ br_index++;
+ br_offset = 0;
+ if (br_index != dict->num_chunks) {
+ chunk = dict->chunk_source[br_index];
+ chunk_length = dict->chunk_offsets[br_index + 1] -
+ dict->chunk_offsets[br_index];
+ } else {
+ break;
+ }
+ }
+ }
+ }
}
/* The copy length is at most the metablock size, and thus expressible. */
GetLengthCode(last_command->insert_len_,
@@ -930,10 +972,12 @@
uint32_t mask;
MemoryManager* m = &s->memory_manager_;
ContextType literal_context_mode;
+ ContextLut literal_context_lut;
data = s->ringbuffer_.buffer_;
mask = s->ringbuffer_.mask_;
+ if (s->params.quality > s->params.dictionary.max_quality) return BROTLI_FALSE;
/* Adding more blocks after "last" block is forbidden. */
if (s->is_last_block_emitted_) return BROTLI_FALSE;
if (is_last) s->is_last_block_emitted_ = BROTLI_TRUE;
@@ -1020,6 +1064,7 @@
literal_context_mode = ChooseContextMode(
&s->params, data, WrapPosition(s->last_flush_pos_),
mask, (size_t)(s->input_pos_ - s->last_flush_pos_));
+ literal_context_lut = BROTLI_CONTEXT_LUT(literal_context_mode);
if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
@@ -1029,24 +1074,21 @@
if (s->params.quality == ZOPFLIFICATION_QUALITY) {
BROTLI_DCHECK(s->params.hasher.type == 10);
- BrotliCreateZopfliBackwardReferences(m,
- bytes, wrapped_last_processed_pos,
- data, mask, &s->params, s->hasher_, s->dist_cache_,
+ BrotliCreateZopfliBackwardReferences(m, bytes, wrapped_last_processed_pos,
+ data, mask, literal_context_lut, &s->params, s->hasher_, s->dist_cache_,
&s->last_insert_len_, &s->commands_[s->num_commands_],
&s->num_commands_, &s->num_literals_);
if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
} else if (s->params.quality == HQ_ZOPFLIFICATION_QUALITY) {
BROTLI_DCHECK(s->params.hasher.type == 10);
- BrotliCreateHqZopfliBackwardReferences(m,
- bytes, wrapped_last_processed_pos,
- data, mask, &s->params, s->hasher_, s->dist_cache_,
+ BrotliCreateHqZopfliBackwardReferences(m, bytes, wrapped_last_processed_pos,
+ data, mask, literal_context_lut, &s->params, s->hasher_, s->dist_cache_,
&s->last_insert_len_, &s->commands_[s->num_commands_],
&s->num_commands_, &s->num_literals_);
if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
} else {
- BrotliCreateBackwardReferences(
- bytes, wrapped_last_processed_pos,
- data, mask, &s->params, s->hasher_, s->dist_cache_,
+ BrotliCreateBackwardReferences(bytes, wrapped_last_processed_pos,
+ data, mask, literal_context_lut, &s->params, s->hasher_, s->dist_cache_,
&s->last_insert_len_, &s->commands_[s->num_commands_],
&s->num_commands_, &s->num_literals_);
}
@@ -1201,6 +1243,7 @@
ChooseDistanceParams(¶ms);
max_block_size = (size_t)1 << params.lgblock;
+ if (params.quality > params.dictionary.max_quality) return BROTLI_FALSE;
BrotliInitMemoryManager(m, 0, 0, 0);
BROTLI_DCHECK(input_size <= mask + 1);
@@ -1226,6 +1269,7 @@
ContextType literal_context_mode = ChooseContextMode(¶ms,
input_buffer, metablock_start, mask, metablock_end - metablock_start);
+ ContextLut literal_context_lut = BROTLI_CONTEXT_LUT(literal_context_mode);
size_t block_start;
for (block_start = metablock_start; block_start < metablock_end; ) {
@@ -1238,8 +1282,8 @@
BrotliInitZopfliNodes(nodes, block_size + 1);
StitchToPreviousBlockH10(hasher, block_size, block_start,
input_buffer, mask);
- path_size = BrotliZopfliComputeShortestPath(m,
- block_size, block_start, input_buffer, mask, ¶ms,
+ path_size = BrotliZopfliComputeShortestPath(m, block_size, block_start,
+ input_buffer, mask, literal_context_lut, ¶ms,
max_backward_limit, dist_cache, hasher, nodes);
if (BROTLI_IS_OOM(m)) goto oom;
/* We allocate a command buffer in the first iteration of this loop that
@@ -1378,6 +1422,7 @@
*encoded_size = total_out_size;
DestroyHasher(m, &hasher);
+ BrotliEncoderCleanupParams(m, ¶ms);
return ok;
oom:
@@ -1859,6 +1904,124 @@
return BROTLI_VERSION;
}
+BrotliEncoderPreparedDictionary* BrotliEncoderPrepareDictionary(
+ const uint8_t* data, size_t size,
+ BrotliSharedDictionaryType type, int quality,
+ brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) {
+ ManagedDictionary* managed_dictionary = NULL;
+ if (type != BROTLI_SHARED_DICTIONARY_RAW &&
+ type != BROTLI_SHARED_DICTIONARY_SERIALIZED) {
+ return NULL;
+ }
+ managed_dictionary =
+ BrotliCreateManagedDictionary(alloc_func, free_func, opaque);
+ if (managed_dictionary == NULL) {
+ return NULL;
+ }
+ if (type == BROTLI_SHARED_DICTIONARY_RAW) {
+ managed_dictionary->dictionary = (uint32_t*)CreatePreparedDictionary(
+ &managed_dictionary->memory_manager_, data, size);
+ } else {
+ SharedEncoderDictionary* dict = (SharedEncoderDictionary*)BrotliAllocate(
+ &managed_dictionary->memory_manager_, sizeof(SharedEncoderDictionary));
+ managed_dictionary->dictionary = (uint32_t*)dict;
+ if (dict != NULL) {
+ BROTLI_BOOL ok = BrotliInitCustomSharedEncoderDictionary(
+ &managed_dictionary->memory_manager_, data, size, quality, dict);
+ if (!ok) {
+ BrotliFree(&managed_dictionary->memory_manager_, dict);
+ managed_dictionary->dictionary = NULL;
+ }
+ }
+ }
+ if (managed_dictionary->dictionary == NULL) {
+ BrotliDestroyManagedDictionary(managed_dictionary);
+ return NULL;
+ }
+ return (BrotliEncoderPreparedDictionary*)managed_dictionary;
+}
+
+void BrotliEncoderDestroyPreparedDictionary(
+ BrotliEncoderPreparedDictionary* dictionary) {
+ ManagedDictionary* dict = (ManagedDictionary*)dictionary;
+ if (!dictionary) return;
+ /* First field of dictionary structs. */
+ /* Only managed dictionaries are eligible for destruction by this method. */
+ if (dict->magic != kManagedDictionaryMagic) {
+ return;
+ }
+ if (dict->dictionary == NULL) {
+ /* This should never ever happen. */
+ } else if (*dict->dictionary == kPreparedDictionaryMagic) {
+ DestroyPreparedDictionary(
+ &dict->memory_manager_, (PreparedDictionary*)dict->dictionary);
+ } else if (*dict->dictionary == kSharedDictionaryMagic) {
+ BrotliCleanupSharedEncoderDictionary(&dict->memory_manager_,
+ (SharedEncoderDictionary*)dict->dictionary);
+ BrotliFree(&dict->memory_manager_, dict->dictionary);
+ } else {
+ /* This should never ever happen. */
+ }
+ dict->dictionary = NULL;
+ BrotliDestroyManagedDictionary(dict);
+}
+
+BROTLI_BOOL BrotliEncoderAttachPreparedDictionary(BrotliEncoderState* state,
+ const BrotliEncoderPreparedDictionary* dictionary) {
+ /* First field of dictionary structs */
+ const BrotliEncoderPreparedDictionary* dict = dictionary;
+ uint32_t magic = *((const uint32_t*)dict);
+ SharedEncoderDictionary* current = NULL;
+ if (magic == kManagedDictionaryMagic) {
+ /* Unwrap managed dictionary. */
+ ManagedDictionary* managed_dictionary = (ManagedDictionary*)dict;
+ magic = *managed_dictionary->dictionary;
+ dict = (BrotliEncoderPreparedDictionary*)managed_dictionary->dictionary;
+ }
+ current = &state->params.dictionary;
+ if (magic == kPreparedDictionaryMagic) {
+ const PreparedDictionary* prepared = (const PreparedDictionary*)dict;
+ if (!AttachPreparedDictionary(¤t->compound, prepared)) {
+ return BROTLI_FALSE;
+ }
+ } else if (magic == kSharedDictionaryMagic) {
+ const SharedEncoderDictionary* attached =
+ (const SharedEncoderDictionary*)dict;
+ BROTLI_BOOL was_default = !current->contextual.context_based &&
+ current->contextual.num_dictionaries == 1 &&
+ current->contextual.dict[0]->hash_table_words ==
+ kStaticDictionaryHashWords &&
+ current->contextual.dict[0]->hash_table_lengths ==
+ kStaticDictionaryHashLengths;
+ BROTLI_BOOL new_default = !attached->contextual.context_based &&
+ attached->contextual.num_dictionaries == 1 &&
+ attached->contextual.dict[0]->hash_table_words ==
+ kStaticDictionaryHashWords &&
+ attached->contextual.dict[0]->hash_table_lengths ==
+ kStaticDictionaryHashLengths;
+ size_t i;
+ if (state->is_initialized_) return BROTLI_FALSE;
+ current->max_quality =
+ BROTLI_MIN(int, current->max_quality, attached->max_quality);
+ for (i = 0; i < attached->compound.num_chunks; i++) {
+ if (!AttachPreparedDictionary(¤t->compound,
+ attached->compound.chunks[i])) {
+ return BROTLI_FALSE;
+ }
+ }
+ if (!new_default) {
+ if (!was_default) return BROTLI_FALSE;
+ /* Copy by value, but then set num_instances_ to 0 because their memory
+ is managed by attached, not by current */
+ current->contextual = attached->contextual;
+ current->contextual.num_instances_ = 0;
+ }
+ } else {
+ return BROTLI_FALSE;
+ }
+ return BROTLI_TRUE;
+}
+
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
#endif
diff --git a/c/enc/encoder_dict.c b/c/enc/encoder_dict.c
index 8b2f6ad..7015a6a 100755
--- a/c/enc/encoder_dict.c
+++ b/c/enc/encoder_dict.c
@@ -7,24 +7,633 @@
#include "./encoder_dict.h"
#include "../common/dictionary.h"
+#include "../common/shared_dictionary_internal.h"
#include "../common/transform.h"
+#include "./compound_dictionary.h"
#include "./dictionary_hash.h"
+#include "./memory.h"
+#include "./quality.h"
#include "./hash.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
+#define NUM_HASH_BITS 15u
+#define NUM_HASH_BUCKETS (1u << NUM_HASH_BITS)
+
+static void BrotliTrieInit(BrotliTrie* trie) {
+ trie->pool_capacity = 0;
+ trie->pool_size = 0;
+ trie->pool = 0;
+
+ /* Set up the root node */
+ trie->root.single = 0;
+ trie->root.len_ = 0;
+ trie->root.idx_ = 0;
+ trie->root.sub = 0;
+}
+
+static void BrotliTrieFree(MemoryManager* m, BrotliTrie* trie) {
+ BrotliFree(m, trie->pool);
+}
+
+/* TODO: make this method internal? */
void BrotliInitEncoderDictionary(BrotliEncoderDictionary* dict) {
dict->words = BrotliGetDictionary();
+ dict->num_transforms = (uint32_t)BrotliGetTransforms()->num_transforms;
- dict->hash_table = kStaticDictionaryHash;
+ dict->hash_table_words = kStaticDictionaryHashWords;
+ dict->hash_table_lengths = kStaticDictionaryHashLengths;
dict->buckets = kStaticDictionaryBuckets;
dict->dict_words = kStaticDictionaryWords;
dict->cutoffTransformsCount = kCutoffTransformsCount;
dict->cutoffTransforms = kCutoffTransforms;
+ dict->parent = 0;
+
+ dict->hash_table_data_words_ = 0;
+ dict->hash_table_data_lengths_ = 0;
+ dict->buckets_alloc_size_ = 0;
+ dict->buckets_data_ = 0;
+ dict->dict_words_alloc_size_ = 0;
+ dict->dict_words_data_ = 0;
+ dict->words_instance_ = 0;
+ dict->has_words_heavy = BROTLI_FALSE;
+ BrotliTrieInit(&dict->trie);
+}
+
+static void BrotliDestroyEncoderDictionary(MemoryManager* m,
+ BrotliEncoderDictionary* dict) {
+ BrotliFree(m, dict->hash_table_data_words_);
+ BrotliFree(m, dict->hash_table_data_lengths_);
+ BrotliFree(m, dict->buckets_data_);
+ BrotliFree(m, dict->dict_words_data_);
+ BrotliFree(m, dict->words_instance_);
+ BrotliTrieFree(m, &dict->trie);
+}
+
+/* TODO: merge with BrotliLoad32LE from dec/bit_reader.h */
+static uint32_t Load32LE(const uint8_t* data) {
+ return (uint32_t)data[0] | ((uint32_t)data[1] << 8) |
+ ((uint32_t)data[2] << 16) | ((uint32_t)data[3] << 24);
+}
+
+/* Word length must be at least 4 bytes */
+static uint32_t Hash(const uint8_t* data, int bits) {
+ uint32_t h = Load32LE(data) * kHashMul32;
+ /* The higher bits contain more mixture from the multiplication,
+ so we take our results from there. */
+ return h >> (32 - bits);
+}
+
+/* Theoretical max possible word size after transform */
+#define kTransformedBufferSize \
+ (256 + 256 + SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH)
+
+/* To be safe buffer must have at least kTransformedBufferSize */
+static void TransformedDictionaryWord(uint32_t word_idx, int len, int transform,
+ const BrotliTransforms* transforms,
+ const BrotliEncoderDictionary* dict,
+ uint8_t* buffer, size_t* size) {
+ const uint8_t* dict_word = &dict->words->data[
+ dict->words->offsets_by_length[len] + (uint32_t)len * word_idx];
+ *size = (size_t)BrotliTransformDictionaryWord(buffer, dict_word, len,
+ transforms, transform);
+}
+
+static DictWord MakeDictWord(uint8_t len, uint8_t transform, uint16_t idx) {
+ DictWord result;
+ result.len = len;
+ result.transform = transform;
+ result.idx = idx;
+ return result;
+}
+
+static uint32_t BrotliTrieAlloc(MemoryManager* m, size_t num, BrotliTrie* trie,
+ BrotliTrieNode** keep) {
+ uint32_t result;
+ uint32_t keep_index = 0;
+ if (keep && *keep != &trie->root) {
+ /* Optional node to keep, since address may change after re-allocating */
+ keep_index = (uint32_t)(*keep - trie->pool);
+ }
+ if (trie->pool_size == 0) {
+ /* Have a dummy node in the front. We do not want the result to be 0, it
+ must be at least 1, 0 represents "null pointer" */
+ trie->pool_size = 1;
+ }
+ BROTLI_ENSURE_CAPACITY(m, BrotliTrieNode, trie->pool, trie->pool_capacity,
+ trie->pool_size + num);
+ if (BROTLI_IS_OOM(m)) return 0;
+ /* Init the new nodes to empty */
+ memset(trie->pool + trie->pool_size, 0, sizeof(*trie->pool) * num);
+ result = (uint32_t)trie->pool_size;
+ trie->pool_size += num;
+ if (keep && *keep != &trie->root) {
+ *keep = trie->pool + keep_index;
+ }
+ return result;
+}
+
+/**
+ * len and idx: payload for last node
+ * word, size: the string
+ * index: position in the string
+ */
+static BROTLI_BOOL BrotliTrieNodeAdd(MemoryManager* m, uint8_t len,
+ uint32_t idx, const uint8_t* word, size_t size, int index,
+ BrotliTrieNode* node, BrotliTrie* trie) {
+ BrotliTrieNode* child = 0;
+ uint8_t c;
+ if ((size_t)index == size) {
+ if (!node->len_ || idx < node->idx_) {
+ node->len_ = len;
+ node->idx_ = idx;
+ }
+ return BROTLI_TRUE;
+ }
+ c = word[index];
+ if (node->single && c != node->c) {
+ BrotliTrieNode old = trie->pool[node->sub];
+ uint32_t new_nodes = BrotliTrieAlloc(m, 32, trie, &node);
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ node->single = 0;
+ node->sub = new_nodes;
+ trie->pool[node->sub + (node->c >> 4)].sub = new_nodes + 16;
+ trie->pool[trie->pool[node->sub + (node->c >> 4)].sub + (node->c & 15)] =
+ old;
+ }
+ if (!node->sub) {
+ uint32_t new_node = BrotliTrieAlloc(m, 1, trie, &node);
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ node->single = 1;
+ node->c = c;
+ node->sub = new_node;
+ }
+ if (node->single) {
+ child = &trie->pool[node->sub];
+ } else {
+ if (!trie->pool[node->sub + (c >> 4)].sub) {
+ uint32_t new_nodes = BrotliTrieAlloc(m, 16, trie, &node);
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ trie->pool[node->sub + (c >> 4)].sub = new_nodes;
+ }
+ child = &trie->pool[trie->pool[node->sub + (c >> 4)].sub + (c & 15)];
+ }
+ return BrotliTrieNodeAdd(m, len, idx, word, size, index + 1, child, trie);
+}
+
+static BROTLI_BOOL BrotliTrieAdd(MemoryManager* m, uint8_t len, uint32_t idx,
+ const uint8_t* word, size_t size, BrotliTrie* trie) {
+ return BrotliTrieNodeAdd(m, len, idx, word, size, 0, &trie->root, trie);
+}
+
+const BrotliTrieNode* BrotliTrieSub(const BrotliTrie* trie,
+ const BrotliTrieNode* node, uint8_t c) {
+ BrotliTrieNode* temp_node;
+ if (node->single) {
+ if (node->c == c) return &trie->pool[node->sub];
+ return 0;
+ }
+ if (!node->sub) return 0;
+ temp_node = &trie->pool[node->sub + (c >> 4)];
+ if (!temp_node->sub) return 0;
+ return &trie->pool[temp_node->sub + (c & 15)];
+}
+
+static const BrotliTrieNode* BrotliTrieFind(const BrotliTrie* trie,
+ const uint8_t* word, size_t size) {
+ const BrotliTrieNode* node = &trie->root;
+ size_t i;
+ for (i = 0; i < size; i++) {
+ node = BrotliTrieSub(trie, node, word[i]);
+ if (!node) return 0;
+ }
+ return node;
+}
+
+static BROTLI_BOOL BuildDictionaryLut(MemoryManager* m,
+ const BrotliTransforms* transforms,
+ BrotliEncoderDictionary* dict) {
+ uint32_t i;
+ DictWord* dict_words;
+ uint16_t* buckets;
+ DictWord** words_by_hash;
+ size_t* words_by_hash_size;
+ size_t* words_by_hash_capacity;
+ BrotliTrie dedup;
+ uint8_t word[kTransformedBufferSize];
+ size_t word_size;
+ size_t total = 0;
+ uint8_t l;
+ uint16_t idx;
+
+ BrotliTrieInit(&dedup);
+
+ words_by_hash = (DictWord**)BrotliAllocate(m,
+ sizeof(*words_by_hash) * NUM_HASH_BUCKETS);
+ words_by_hash_size = (size_t*)BrotliAllocate(m,
+ sizeof(*words_by_hash_size) * NUM_HASH_BUCKETS);
+ words_by_hash_capacity = (size_t*)BrotliAllocate(m,
+ sizeof(*words_by_hash_capacity) * NUM_HASH_BUCKETS);
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ memset(words_by_hash, 0, sizeof(*words_by_hash) * NUM_HASH_BUCKETS);
+ memset(words_by_hash_size, 0, sizeof(*words_by_hash_size) * NUM_HASH_BUCKETS);
+ memset(words_by_hash_capacity, 0,
+ sizeof(*words_by_hash_capacity) * NUM_HASH_BUCKETS);
+
+ if (transforms->num_transforms > 0) {
+ for (l = SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH;
+ l <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH; ++l) {
+ uint16_t n = dict->words->size_bits_by_length[l] ?
+ (uint16_t)(1 << dict->words->size_bits_by_length[l]) : 0;
+ for (idx = 0; idx < n; ++idx) {
+ uint32_t key;
+ /* First transform (usually identity) */
+ TransformedDictionaryWord(idx, l, 0, transforms, dict, word,
+ &word_size);
+ /* Cannot hash words smaller than 4 bytes */
+ if (word_size < 4) {
+ /* Break instead of continue, all next words of this length will have
+ same length after transform */
+ break;
+ }
+ if (!BrotliTrieAdd(m, 0, idx, word, word_size, &dedup)) {
+ return BROTLI_FALSE;
+ }
+ key = Hash(word, NUM_HASH_BITS);
+ BROTLI_ENSURE_CAPACITY_APPEND(m, DictWord, words_by_hash[key],
+ words_by_hash_capacity[key], words_by_hash_size[key],
+ MakeDictWord(l, 0, idx));
+ ++total;
+ }
+ }
+ }
+
+ /* These LUT transforms only supported if no custom transforms. This is
+ ok, we will use the heavy trie instead. */
+ if (transforms == BrotliGetTransforms()) {
+ for (l = SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH;
+ l <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH; ++l) {
+ uint16_t n = dict->words->size_bits_by_length[l] ?
+ (uint16_t)(1 << dict->words->size_bits_by_length[l]) : 0;
+ for (idx = 0; idx < n; ++idx) {
+ int k;
+ BROTLI_BOOL is_ascii = BROTLI_TRUE;
+ size_t offset = dict->words->offsets_by_length[l] + (size_t)l * idx;
+ const uint8_t* data = &dict->words->data[offset];
+ for (k = 0; k < l; ++k) {
+ if (data[k] >= 128) is_ascii = BROTLI_FALSE;
+ }
+ if (data[0] < 128) {
+ int transform = 9; /* {empty, uppercase first, empty} */
+ uint32_t ix = idx + (uint32_t)transform * n;
+ const BrotliTrieNode* it;
+ TransformedDictionaryWord(idx, l, transform, transforms,
+ dict, word, &word_size);
+ it = BrotliTrieFind(&dedup, word, word_size);
+ if (!it || it->idx_ > ix) {
+ uint32_t key = Hash(word, NUM_HASH_BITS);
+ if (!BrotliTrieAdd(m, 0, ix, word, word_size, &dedup)) {
+ return BROTLI_FALSE;
+ }
+ BROTLI_ENSURE_CAPACITY_APPEND(m, DictWord, words_by_hash[key],
+ words_by_hash_capacity[key], words_by_hash_size[key],
+ MakeDictWord(l, BROTLI_TRANSFORM_UPPERCASE_FIRST, idx));
+ ++total;
+ }
+ }
+ if (is_ascii) {
+ int transform = 44; /* {empty, uppercase all, empty} */
+ uint32_t ix = idx + (uint32_t)transform * n;
+ const BrotliTrieNode* it;
+ TransformedDictionaryWord(idx, l, transform, transforms,
+ dict, word, &word_size);
+ it = BrotliTrieFind(&dedup, word, word_size);
+ if (!it || it->idx_ > ix) {
+ uint32_t key = Hash(word, NUM_HASH_BITS);
+ if (!BrotliTrieAdd(m, 0, ix, word, word_size, &dedup)) {
+ return BROTLI_FALSE;
+ }
+ BROTLI_ENSURE_CAPACITY_APPEND(m, DictWord, words_by_hash[key],
+ words_by_hash_capacity[key], words_by_hash_size[key],
+ MakeDictWord(l, BROTLI_TRANSFORM_UPPERCASE_ALL, idx));
+ ++total;
+ }
+ }
+ }
+ }
+ }
+
+ dict_words = (DictWord*)BrotliAllocate(m,
+ sizeof(*dict->dict_words) * (total + 1));
+ buckets = (uint16_t*)BrotliAllocate(m,
+ sizeof(*dict->buckets) * NUM_HASH_BUCKETS);
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ dict->dict_words_alloc_size_ = total + 1;
+ dict->dict_words = dict->dict_words_data_ = dict_words;
+ dict->buckets_alloc_size_ = NUM_HASH_BUCKETS;
+ dict->buckets = dict->buckets_data_ = buckets;
+
+ /* Unused; makes offsets start from 1. */
+ dict_words[0] = MakeDictWord(0, 0, 0);
+ total = 1;
+ for (i = 0; i < NUM_HASH_BUCKETS; ++i) {
+ size_t num_words = words_by_hash_size[i];
+ if (num_words > 0) {
+ buckets[i] = (uint16_t)(total);
+ memcpy(&dict_words[total], &words_by_hash[i][0],
+ sizeof(dict_words[0]) * num_words);
+ total += num_words;
+ dict_words[total - 1].len |= 0x80;
+ } else {
+ buckets[i] = 0;
+ }
+ }
+
+ for (i = 0; i < NUM_HASH_BUCKETS; ++i) {
+ BrotliFree(m, words_by_hash[i]);
+ }
+ BrotliFree(m, words_by_hash);
+ BrotliFree(m, words_by_hash_size);
+ BrotliFree(m, words_by_hash_capacity);
+ BrotliTrieFree(m, &dedup);
+
+ return BROTLI_TRUE;
+}
+
+static void BuildDictionaryHashTable(uint16_t* hash_table_words,
+ uint8_t* hash_table_lengths, const BrotliDictionary* dict) {
+ int j, len;
+ /* The order of the loops is such that in case of collision, words with
+ shorter length are preferred, and in case of same length, words with
+ smaller index. There is only a single word per bucket. */
+ /* TODO: consider adding optional user-supplied frequency_map to use
+ for preferred words instead, this can make the encoder better for
+ quality 9 and below without affecting the decoder */
+ memset(hash_table_words, 0, sizeof(kStaticDictionaryHashWords));
+ memset(hash_table_lengths, 0, sizeof(kStaticDictionaryHashLengths));
+ for (len = SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH;
+ len >= SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH; --len) {
+ const size_t num_words = dict->size_bits_by_length[len] ?
+ (1u << dict->size_bits_by_length[len]) : 0;
+ for (j = (int)num_words - 1; j >= 0; --j) {
+ size_t offset = dict->offsets_by_length[len] +
+ (size_t)len * (size_t)j;
+ const uint8_t* word = &dict->data[offset];
+ const uint32_t key = Hash(word, 14);
+ int idx = (int)(key << 1) + (len < 8 ? 1 : 0);
+ BROTLI_DCHECK(idx < (int)NUM_HASH_BUCKETS);
+ hash_table_words[idx] = (uint16_t)j;
+ hash_table_lengths[idx] = (uint8_t)len;
+ }
+ }
+}
+
+static BROTLI_BOOL GenerateWordsHeavy(MemoryManager* m,
+ const BrotliTransforms* transforms,
+ BrotliEncoderDictionary* dict) {
+ int i, j, l;
+ for (j = (int)transforms->num_transforms - 1; j >= 0 ; --j) {
+ for (l = 0; l < 32; l++) {
+ int num = (int)((1u << dict->words->size_bits_by_length[l]) & ~1u);
+ for (i = 0; i < num; i++) {
+ uint8_t transformed[kTransformedBufferSize];
+ size_t size;
+ TransformedDictionaryWord(
+ (uint32_t)i, l, j, transforms, dict, transformed, &size);
+ if (size < 4) continue;
+ if (!BrotliTrieAdd(m, (uint8_t)l, (uint32_t)(i + num * j),
+ transformed, size, &dict->trie)) {
+ return BROTLI_FALSE;
+ }
+ }
+ }
+ }
+ return BROTLI_TRUE;
+}
+
+/* Computes cutoffTransformsCount (in count) and cutoffTransforms (in data) for
+ the custom transforms, where possible within the limits of the
+ cutoffTransforms encoding. The fast encoder uses this to do fast lookup for
+ transforms that remove the N last characters (OmitLast). */
+static void ComputeCutoffTransforms(
+ const BrotliTransforms* transforms,
+ uint32_t* count, uint64_t* data) {
+ int i;
+ /* The encoding in a 64-bit integer of transform N in the data is: (N << 2) +
+ ((cutoffTransforms >> (N * 6)) & 0x3F), so for example the identity
+ transform code must be 0-63, for N=1 the transform code must be 4-67, ...,
+ for N=9 it must be 36-99.
+ TODO: consider a simple flexible uint8_t[10] instead of the uint64_t
+ for the cutoff transforms, so that shared dictionaries can have the
+ OmitLast transforms anywhere without loss. */
+ *count = 0;
+ *data = 0;
+ for (i = 0; i < BROTLI_TRANSFORMS_MAX_CUT_OFF + 1; i++) {
+ int idx = transforms->cutOffTransforms[i];
+ if (idx == -1) break; /* Not found */
+ if (idx < (i << 2)) break; /* Too small for the encoding */
+ if (idx >= (i << 2) + 64) break; /* Too large for the encoding */
+ (*count)++;
+ *data |= (uint64_t)(((uint64_t)idx -
+ ((uint64_t)i << 2u)) << ((uint64_t)i * 6u));
+ }
+}
+
+static BROTLI_BOOL ComputeDictionary(MemoryManager* m, int quality,
+ const BrotliTransforms* transforms,
+ BrotliEncoderDictionary* current) {
+ int default_words = current->words == BrotliGetDictionary();
+ int default_transforms = transforms == BrotliGetTransforms();
+
+ if (default_words && default_transforms) {
+ /* hashes are already set to Brotli defaults */
+ return BROTLI_TRUE;
+ }
+
+ current->hash_table_data_words_ = (uint16_t*)BrotliAllocate(
+ m, sizeof(kStaticDictionaryHashWords));
+ current->hash_table_data_lengths_ = (uint8_t*)BrotliAllocate(
+ m, sizeof(kStaticDictionaryHashLengths));
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ current->hash_table_words = current->hash_table_data_words_;
+ current->hash_table_lengths = current->hash_table_data_lengths_;
+
+ BuildDictionaryHashTable(current->hash_table_data_words_,
+ current->hash_table_data_lengths_, current->words);
+
+ ComputeCutoffTransforms(transforms,
+ ¤t->cutoffTransformsCount, ¤t->cutoffTransforms);
+
+ /* Only compute the data for slow encoder if the requested quality is high
+ enough to need it */
+ if (quality >= ZOPFLIFICATION_QUALITY) {
+ if (!BuildDictionaryLut(m, transforms, current)) return BROTLI_FALSE;
+
+ /* For the built-in Brotli transforms, there is a hard-coded function to
+ handle all transforms, but for custom transforms, we use the following
+ large hammer instead */
+ current->has_words_heavy = !default_transforms;
+ if (current->has_words_heavy) {
+ if (!GenerateWordsHeavy(m, transforms, current)) return BROTLI_FALSE;
+ }
+ }
+
+ return BROTLI_TRUE;
+}
+
+void BrotliInitSharedEncoderDictionary(SharedEncoderDictionary* dict) {
+ dict->magic = kSharedDictionaryMagic;
+
+ dict->compound.num_chunks = 0;
+ dict->compound.total_size = 0;
+ dict->compound.chunk_offsets[0] = 0;
+ dict->compound.num_prepared_instances_ = 0;
+
+ dict->contextual.context_based = 0;
+ dict->contextual.num_dictionaries = 1;
+ dict->contextual.instances_ = 0;
+ dict->contextual.num_instances_ = 1; /* The instance_ field */
+ dict->contextual.dict[0] = &dict->contextual.instance_;
+ BrotliInitEncoderDictionary(&dict->contextual.instance_);
+ dict->contextual.instance_.parent = &dict->contextual;
+
+ dict->max_quality = BROTLI_MAX_QUALITY;
+}
+
+static BROTLI_BOOL InitCustomSharedEncoderDictionary(
+ MemoryManager* m, const BrotliSharedDictionary* decoded_dict,
+ int quality, SharedEncoderDictionary* dict) {
+ ContextualEncoderDictionary* contextual;
+ CompoundDictionary* compound;
+ BrotliEncoderDictionary* instances;
+ int i;
+ BrotliInitSharedEncoderDictionary(dict);
+
+ contextual = &dict->contextual;
+ compound = &dict->compound;
+
+ for (i = 0; i < (int)decoded_dict->num_prefix; i++) {
+ PreparedDictionary* prepared = CreatePreparedDictionary(m,
+ decoded_dict->prefix[i], decoded_dict->prefix_size[i]);
+ AttachPreparedDictionary(compound, prepared);
+ /* remember for cleanup */
+ compound->prepared_instances_[
+ compound->num_prepared_instances_++] = prepared;
+ }
+
+ dict->max_quality = quality;
+ contextual->context_based = decoded_dict->context_based;
+ if (decoded_dict->context_based) {
+ memcpy(contextual->context_map, decoded_dict->context_map,
+ SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS);
+ }
+
+ contextual->num_dictionaries = decoded_dict->num_dictionaries;
+ contextual->num_instances_ = decoded_dict->num_dictionaries;
+ if (contextual->num_instances_ == 1) {
+ instances = &contextual->instance_;
+ } else {
+ contextual->instances_ = (BrotliEncoderDictionary*)
+ BrotliAllocate(m, sizeof(*contextual->instances_) *
+ contextual->num_instances_);
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ instances = contextual->instances_;
+ }
+ for (i = 0; i < (int)contextual->num_instances_; i++) {
+ BrotliEncoderDictionary* current = &instances[i];
+ BrotliInitEncoderDictionary(current);
+ current->parent = &dict->contextual;
+ if (decoded_dict->words[i] == BrotliGetDictionary()) {
+ current->words = BrotliGetDictionary();
+ } else {
+ current->words_instance_ = (BrotliDictionary*)BrotliAllocate(
+ m, sizeof(BrotliDictionary));
+ if (BROTLI_IS_OOM(m)) return BROTLI_FALSE;
+ *current->words_instance_ = *decoded_dict->words[i];
+ current->words = current->words_instance_;
+ }
+ current->num_transforms =
+ (uint32_t)decoded_dict->transforms[i]->num_transforms;
+ if (!ComputeDictionary(
+ m, quality, decoded_dict->transforms[i], current)) {
+ return BROTLI_FALSE;
+ }
+
+ contextual->dict[i] = current;
+ }
+
+ return BROTLI_TRUE; /* success */
+}
+
+BROTLI_BOOL BrotliInitCustomSharedEncoderDictionary(
+ MemoryManager* m, const uint8_t* encoded_dict, size_t size,
+ int quality, SharedEncoderDictionary* dict) {
+ BROTLI_BOOL success = BROTLI_FALSE;
+ BrotliSharedDictionary* decoded_dict = BrotliSharedDictionaryCreateInstance(
+ m->alloc_func, m->free_func, m->opaque);
+ if (!decoded_dict) { /* OOM */
+ return BROTLI_FALSE;
+ }
+ success = BrotliSharedDictionaryAttach(
+ decoded_dict, BROTLI_SHARED_DICTIONARY_SERIALIZED, encoded_dict, size);
+ if (success) {
+ success = InitCustomSharedEncoderDictionary(m,
+ decoded_dict, quality, dict);
+ }
+ BrotliSharedDictionaryDestroyInstance(decoded_dict);
+ return success;
+}
+
+void BrotliCleanupSharedEncoderDictionary(MemoryManager* m,
+ SharedEncoderDictionary* dict) {
+ size_t i;
+ for (i = 0; i < dict->compound.num_prepared_instances_; i++) {
+ DestroyPreparedDictionary(m,
+ (PreparedDictionary*)dict->compound.prepared_instances_[i]);
+ }
+ if (dict->contextual.num_instances_ == 1) {
+ BrotliDestroyEncoderDictionary(m, &dict->contextual.instance_);
+ } else if (dict->contextual.num_instances_ > 1) {
+ for (i = 0; i < dict->contextual.num_instances_; i++) {
+ BrotliDestroyEncoderDictionary(m, &dict->contextual.instances_[i]);
+ }
+ BrotliFree(m, dict->contextual.instances_);
+ }
+}
+
+ManagedDictionary* BrotliCreateManagedDictionary(
+ brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) {
+ ManagedDictionary* result = NULL;
+
+ /* TODO: Refactor this snippet to macros. */
+ if (!alloc_func && !free_func) {
+ result = (ManagedDictionary*)malloc(sizeof(ManagedDictionary));
+ } else if (alloc_func && free_func) {
+ result = (ManagedDictionary*)alloc_func(opaque, sizeof(ManagedDictionary));
+ }
+ if (result == NULL) return NULL;
+
+ result->magic = kManagedDictionaryMagic;
+ BrotliInitMemoryManager(
+ &result->memory_manager_, alloc_func, free_func, opaque);
+ result->dictionary = NULL;
+
+ return result;
+}
+
+void BrotliDestroyManagedDictionary(ManagedDictionary* dictionary) {
+ MemoryManager* m = NULL;
+ if (!dictionary) return;
+ m = &dictionary->memory_manager_;
+ {
+ brotli_free_func free_func = m->free_func;
+ void* opaque = m->opaque;
+ free_func(opaque, dictionary);
+ }
}
#if defined(__cplusplus) || defined(c_plusplus)
diff --git a/c/enc/encoder_dict.h b/c/enc/encoder_dict.h
index 3cb6b0a..a0bdd60 100755
--- a/c/enc/encoder_dict.h
+++ b/c/enc/encoder_dict.h
@@ -9,31 +9,147 @@
#include "../common/dictionary.h"
#include "../common/platform.h"
+#include <brotli/shared_dictionary.h>
#include <brotli/types.h>
+#include "./compound_dictionary.h"
+#include "./memory.h"
#include "./static_dict_lut.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
+/*
+Dictionary hierarchy for Encoder:
+-SharedEncoderDictionary
+--CompoundDictionary
+---PreparedDictionary [up to 15x]
+ = prefix dictionary with precomputed hashes
+--ContextualEncoderDictionary
+---BrotliEncoderDictionary [up to 64x]
+ = for each context, precomputed static dictionary with words + transforms
+
+Dictionary hiearchy from common: similar, but without precomputed hashes
+-BrotliSharedDictionary
+--BrotliDictionary [up to 64x]
+--BrotliTransforms [up to 64x]
+--const uint8_t* prefix [up to 15x]: compound dictionaries
+*/
+
+typedef struct BrotliTrieNode {
+ uint8_t single; /* if 1, sub is a single node for c instead of 256 */
+ uint8_t c;
+ uint8_t len_; /* untransformed length */
+ uint32_t idx_; /* word index + num words * transform index */
+ uint32_t sub; /* index of sub node(s) in the pool */
+} BrotliTrieNode;
+
+typedef struct BrotliTrie {
+ BrotliTrieNode* pool;
+ size_t pool_capacity;
+ size_t pool_size;
+ BrotliTrieNode root;
+} BrotliTrie;
+
+BROTLI_INTERNAL const BrotliTrieNode* BrotliTrieSub(const BrotliTrie* trie,
+ const BrotliTrieNode* node, uint8_t c);
/* Dictionary data (words and transforms) for 1 possible context */
typedef struct BrotliEncoderDictionary {
const BrotliDictionary* words;
+ uint32_t num_transforms;
/* cut off for fast encoder */
uint32_t cutoffTransformsCount;
uint64_t cutoffTransforms;
/* from dictionary_hash.h, for fast encoder */
- const uint16_t* hash_table;
+ const uint16_t* hash_table_words;
+ const uint8_t* hash_table_lengths;
/* from static_dict_lut.h, for slow encoder */
const uint16_t* buckets;
const DictWord* dict_words;
+ /* Heavy version, for use by slow encoder when there are custom transforms.
+ Contains every possible transformed dictionary word in a trie. It encodes
+ about as fast as the non-heavy encoder but consumes a lot of memory and
+ takes time to build. */
+ BrotliTrie trie;
+ BROTLI_BOOL has_words_heavy;
+
+ /* Reference to other dictionaries. */
+ const struct ContextualEncoderDictionary* parent;
+
+ /* Allocated memory, used only when not using the Brotli defaults */
+ uint16_t* hash_table_data_words_;
+ uint8_t* hash_table_data_lengths_;
+ size_t buckets_alloc_size_;
+ uint16_t* buckets_data_;
+ size_t dict_words_alloc_size_;
+ DictWord* dict_words_data_;
+ BrotliDictionary* words_instance_;
} BrotliEncoderDictionary;
+/* Initializes to the brotli built-in dictionary */
BROTLI_INTERNAL void BrotliInitEncoderDictionary(BrotliEncoderDictionary* dict);
+/* Dictionary data for all 64 contexts */
+typedef struct ContextualEncoderDictionary {
+ BROTLI_BOOL context_based;
+ uint8_t num_dictionaries;
+ uint8_t context_map[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
+ const BrotliEncoderDictionary* dict[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS];
+
+ /* If num_instances_ is 1, instance_ is used, else dynamic allocation with
+ instances_ is used. */
+ size_t num_instances_;
+ BrotliEncoderDictionary instance_;
+ BrotliEncoderDictionary* instances_;
+} ContextualEncoderDictionary;
+
+static const uint32_t kSharedDictionaryMagic = 0xDEBCEDE1;
+static const uint32_t kManagedDictionaryMagic = 0xDEBCEDE2;
+
+typedef struct SharedEncoderDictionary {
+ /* Magic value to distinguish this struct from PreparedDictionary for
+ certain external usages. */
+ uint32_t magic;
+
+ /* LZ77 prefix, compound dictionary */
+ CompoundDictionary compound;
+
+ /* Custom static dictionary (optionally context-based) */
+ ContextualEncoderDictionary contextual;
+
+ /* The maximum quality the dictionary was computed for */
+ int max_quality;
+} SharedEncoderDictionary;
+
+typedef struct ManagedDictionary {
+ uint32_t magic;
+ MemoryManager memory_manager_;
+ uint32_t* dictionary;
+} ManagedDictionary;
+
+/* Initializes to the brotli built-in dictionary */
+BROTLI_INTERNAL void BrotliInitSharedEncoderDictionary(
+ SharedEncoderDictionary* dict);
+
+/* Initializes to shared dictionary that will be parsed from
+ encoded_dict. Requires that you keep the encoded_dict buffer
+ around, parts of data will point to it. */
+BROTLI_INTERNAL BROTLI_BOOL BrotliInitCustomSharedEncoderDictionary(
+ MemoryManager* m, const uint8_t* encoded_dict, size_t size,
+ int quality, SharedEncoderDictionary* dict);
+
+BROTLI_INTERNAL void BrotliCleanupSharedEncoderDictionary(
+ MemoryManager* m, SharedEncoderDictionary* dict);
+
+BROTLI_INTERNAL ManagedDictionary* BrotliCreateManagedDictionary(
+ brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque);
+
+BROTLI_INTERNAL void BrotliDestroyManagedDictionary(
+ ManagedDictionary* dictionary);
+
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
#endif
diff --git a/c/enc/hash.h b/c/enc/hash.h
index 2602490..d006f1f 100644
--- a/c/enc/hash.h
+++ b/c/enc/hash.h
@@ -36,10 +36,8 @@
* * HasherCommon structure
* * private structured hasher data, depending on hasher type
* * private dynamic hasher data, depending on hasher type and parameters
- *
- * Using "define" instead of "typedef", because on MSVC __restrict does not work
- * on typedef pointer types. */
-#define HasherHandle uint8_t*
+ */
+typedef uint8_t* HasherHandle;
typedef struct {
BrotliHasherParams params;
@@ -149,17 +147,13 @@
}
static BROTLI_INLINE BROTLI_BOOL TestStaticDictionaryItem(
- const BrotliEncoderDictionary* dictionary, size_t item, const uint8_t* data,
- size_t max_length, size_t max_backward, size_t max_distance,
- HasherSearchResult* out) {
- size_t len;
- size_t word_idx;
+ const BrotliEncoderDictionary* dictionary, size_t len, size_t word_idx,
+ const uint8_t* data, size_t max_length, size_t max_backward,
+ size_t max_distance, HasherSearchResult* out) {
size_t offset;
size_t matchlen;
size_t backward;
score_t score;
- len = item & 0x1F;
- word_idx = item >> 5;
offset = dictionary->words->offsets_by_length[len] + len * word_idx;
if (len > max_length) {
return BROTLI_FALSE;
@@ -204,11 +198,12 @@
}
key = Hash14(data) << 1;
for (i = 0; i < (shallow ? 1u : 2u); ++i, ++key) {
- size_t item = dictionary->hash_table[key];
self->dict_num_lookups++;
- if (item != 0) {
+ if (dictionary->hash_table_lengths[key] != 0) {
BROTLI_BOOL item_matches = TestStaticDictionaryItem(
- dictionary, item, data, max_length, max_backward, max_distance, out);
+ dictionary, dictionary->hash_table_lengths[key],
+ dictionary->hash_table_words[key], data,
+ max_length, max_backward, max_distance, out);
if (item_matches) {
self->dict_num_matches++;
}
@@ -343,57 +338,11 @@
#undef BUCKET_BITS
#undef HASHER
-/* fast large window hashers */
-
-#define HASHER() HROLLING_FAST
-#define CHUNKLEN 32
-#define JUMP 4
-#define NUMBUCKETS 16777216
-#define MASK ((NUMBUCKETS * 64) - 1)
-#include "./hash_rolling_inc.h" /* NOLINT(build/include) */
-#undef JUMP
-#undef HASHER
-
-
-#define HASHER() HROLLING
-#define JUMP 1
-#include "./hash_rolling_inc.h" /* NOLINT(build/include) */
-#undef MASK
-#undef NUMBUCKETS
-#undef JUMP
-#undef CHUNKLEN
-#undef HASHER
-
-#define HASHER() H35
-#define HASHER_A H3
-#define HASHER_B HROLLING_FAST
-#include "./hash_composite_inc.h" /* NOLINT(build/include) */
-#undef HASHER_A
-#undef HASHER_B
-#undef HASHER
-
-#define HASHER() H55
-#define HASHER_A H54
-#define HASHER_B HROLLING_FAST
-#include "./hash_composite_inc.h" /* NOLINT(build/include) */
-#undef HASHER_A
-#undef HASHER_B
-#undef HASHER
-
-#define HASHER() H65
-#define HASHER_A H6
-#define HASHER_B HROLLING
-#include "./hash_composite_inc.h" /* NOLINT(build/include) */
-#undef HASHER_A
-#undef HASHER_B
-#undef HASHER
-
#undef FN
#undef CAT
#undef EXPAND_CAT
-#define FOR_GENERIC_HASHERS(H) H(2) H(3) H(4) H(5) H(6) H(40) H(41) H(42) H(54)\
- H(35) H(55) H(65)
+#define FOR_GENERIC_HASHERS(H) H(2) H(3) H(4) H(5) H(6) H(40) H(41) H(42) H(54)
#define FOR_ALL_HASHERS(H) FOR_GENERIC_HASHERS(H) H(10)
static BROTLI_INLINE void DestroyHasher(
@@ -490,6 +439,202 @@
}
}
+static BROTLI_INLINE void FindCompoundDictionaryMatch(
+ const PreparedDictionary* self, const uint8_t* BROTLI_RESTRICT data,
+ const size_t ring_buffer_mask, const int* BROTLI_RESTRICT distance_cache,
+ const size_t cur_ix, const size_t max_length, const size_t distance_offset,
+ const size_t max_distance, HasherSearchResult* BROTLI_RESTRICT out) {
+ const uint32_t source_offset = self->source_offset;
+ const uint32_t source_size = self->source_size;
+ const size_t boundary = distance_offset - source_size;
+ const uint32_t hash_bits = self->hash_bits;
+ const uint32_t bucket_bits = self->bucket_bits;
+ const uint32_t slot_bits = self->slot_bits;
+
+ const uint32_t hash_shift = 64u - bucket_bits;
+ const uint32_t slot_mask = (~((uint32_t)0U)) >> (32 - slot_bits);
+ const uint64_t hash_mask = (~((uint64_t)0U)) >> (64 - hash_bits);
+
+ const uint32_t* slot_offsets = (uint32_t*)(&self[1]);
+ const uint16_t* heads = (uint16_t*)(&slot_offsets[1u << slot_bits]);
+ const uint32_t* items = (uint32_t*)(&heads[1u << bucket_bits]);
+ const uint8_t* source = (uint8_t*)(&items[source_offset]);
+
+ const size_t cur_ix_masked = cur_ix & ring_buffer_mask;
+ score_t best_score = out->score;
+ size_t best_len = out->len;
+ size_t i;
+ const uint64_t h =
+ (BROTLI_UNALIGNED_LOAD64LE(&data[cur_ix_masked]) & hash_mask) *
+ kPreparedDictionaryHashMul64Long;
+ const uint32_t key = (uint32_t)(h >> hash_shift);
+ const uint32_t slot = key & slot_mask;
+ const uint32_t head = heads[key];
+ const uint32_t* BROTLI_RESTRICT chain = &items[slot_offsets[slot] + head];
+ uint32_t item = (head == 0xFFFF) ? 1 : 0;
+ for (i = 0; i < 4; ++i) {
+ const size_t distance = (size_t)distance_cache[i];
+ size_t offset;
+ size_t limit;
+ size_t len;
+ if (distance <= boundary || distance > distance_offset) continue;
+ offset = distance_offset - distance;
+ limit = source_size - offset;
+ limit = limit > max_length ? max_length : limit;
+ len = FindMatchLengthWithLimit(&source[offset], &data[cur_ix_masked],
+ limit);
+ if (len >= 2) {
+ score_t score = BackwardReferenceScoreUsingLastDistance(len);
+ if (best_score < score) {
+ if (i != 0) score -= BackwardReferencePenaltyUsingLastDistance(i);
+ if (best_score < score) {
+ best_score = score;
+ if (len > best_len) best_len = len;
+ out->len = len;
+ out->len_code_delta = 0;
+ out->distance = distance;
+ out->score = best_score;
+ }
+ }
+ }
+ }
+ while (item == 0) {
+ size_t offset;
+ size_t distance;
+ size_t limit;
+ item = *chain;
+ chain++;
+ offset = item & 0x7FFFFFFF;
+ item &= 0x80000000;
+ distance = distance_offset - offset;
+ limit = source_size - offset;
+ limit = (limit > max_length) ? max_length : limit;
+ if (distance > max_distance) continue;
+ if (cur_ix_masked + best_len > ring_buffer_mask ||
+ best_len >= limit ||
+ data[cur_ix_masked + best_len] != source[offset + best_len]) {
+ continue;
+ }
+ {
+ const size_t len = FindMatchLengthWithLimit(&source[offset],
+ &data[cur_ix_masked],
+ limit);
+ if (len >= 4) {
+ score_t score = BackwardReferenceScore(len, distance);
+ if (best_score < score) {
+ best_score = score;
+ best_len = len;
+ out->len = best_len;
+ out->len_code_delta = 0;
+ out->distance = distance;
+ out->score = best_score;
+ }
+ }
+ }
+ }
+}
+
+static BROTLI_INLINE size_t FindAllCompoundDictionaryMatches(
+ const PreparedDictionary* self, const uint8_t* BROTLI_RESTRICT data,
+ const size_t ring_buffer_mask, const size_t cur_ix, const size_t min_length,
+ const size_t max_length, const size_t distance_offset,
+ const size_t max_distance, BackwardMatch* matches, size_t match_limit) {
+ const uint32_t source_offset = self->source_offset;
+ const uint32_t source_size = self->source_size;
+ const uint32_t hash_bits = self->hash_bits;
+ const uint32_t bucket_bits = self->bucket_bits;
+ const uint32_t slot_bits = self->slot_bits;
+
+ const uint32_t hash_shift = 64u - bucket_bits;
+ const uint32_t slot_mask = (~((uint32_t)0U)) >> (32 - slot_bits);
+ const uint64_t hash_mask = (~((uint64_t)0U)) >> (64 - hash_bits);
+
+ const uint32_t* slot_offsets = (uint32_t*)(&self[1]);
+ const uint16_t* heads = (uint16_t*)(&slot_offsets[1u << slot_bits]);
+ const uint32_t* items = (uint32_t*)(&heads[1u << bucket_bits]);
+ const uint8_t* source = (uint8_t*)(&items[source_offset]);
+
+ const size_t cur_ix_masked = cur_ix & ring_buffer_mask;
+ size_t best_len = min_length;
+ const uint64_t h =
+ (BROTLI_UNALIGNED_LOAD64LE(&data[cur_ix_masked]) & hash_mask) *
+ kPreparedDictionaryHashMul64Long;
+ const uint32_t key = (uint32_t)(h >> hash_shift);
+ const uint32_t slot = key & slot_mask;
+ const uint32_t head = heads[key];
+ const uint32_t* BROTLI_RESTRICT chain = &items[slot_offsets[slot] + head];
+ uint32_t item = (head == 0xFFFF) ? 1 : 0;
+ size_t found = 0;
+ while (item == 0) {
+ size_t offset;
+ size_t distance;
+ size_t limit;
+ size_t len;
+ item = *chain;
+ chain++;
+ offset = item & 0x7FFFFFFF;
+ item &= 0x80000000;
+ distance = distance_offset - offset;
+ limit = source_size - offset;
+ limit = (limit > max_length) ? max_length : limit;
+ if (distance > max_distance) continue;
+ if (cur_ix_masked + best_len > ring_buffer_mask ||
+ best_len >= limit ||
+ data[cur_ix_masked + best_len] != source[offset + best_len]) {
+ continue;
+ }
+ len = FindMatchLengthWithLimit(
+ &source[offset], &data[cur_ix_masked], limit);
+ if (len > best_len) {
+ best_len = len;
+ InitBackwardMatch(matches++, distance, len);
+ found++;
+ if (found == match_limit) break;
+ }
+ }
+ return found;
+}
+
+static BROTLI_INLINE void LookupCompoundDictionaryMatch(
+ const CompoundDictionary* addon, const uint8_t* BROTLI_RESTRICT data,
+ const size_t ring_buffer_mask, const int* BROTLI_RESTRICT distance_cache,
+ const size_t cur_ix, const size_t max_length,
+ const size_t max_ring_buffer_distance, const size_t max_distance,
+ HasherSearchResult* sr) {
+ size_t base_offset = max_ring_buffer_distance + 1 + addon->total_size - 1;
+ size_t d;
+ for (d = 0; d < addon->num_chunks; ++d) {
+ /* Only one prepared dictionary type is currently supported. */
+ FindCompoundDictionaryMatch(
+ (const PreparedDictionary*)addon->chunks[d], data, ring_buffer_mask,
+ distance_cache, cur_ix, max_length,
+ base_offset - addon->chunk_offsets[d], max_distance, sr);
+ }
+}
+
+static BROTLI_INLINE size_t LookupAllCompoundDictionaryMatches(
+ const CompoundDictionary* addon, const uint8_t* BROTLI_RESTRICT data,
+ const size_t ring_buffer_mask, const size_t cur_ix, size_t min_length,
+ const size_t max_length, const size_t max_ring_buffer_distance,
+ const size_t max_distance, BackwardMatch* matches,
+ size_t match_limit) {
+ size_t base_offset = max_ring_buffer_distance + 1 + addon->total_size - 1;
+ size_t d;
+ size_t total_found = 0;
+ for (d = 0; d < addon->num_chunks; ++d) {
+ /* Only one prepared dictionary type is currently supported. */
+ total_found += FindAllCompoundDictionaryMatches(
+ (const PreparedDictionary*)addon->chunks[d], data, ring_buffer_mask,
+ cur_ix, min_length, max_length, base_offset - addon->chunk_offsets[d],
+ max_distance, matches + total_found, match_limit - total_found);
+ if (total_found == match_limit) break;
+ if (total_found > 0) {
+ min_length = BackwardMatchLength(&matches[total_found - 1]);
+ }
+ }
+ return total_found;
+}
+
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
#endif
diff --git a/c/enc/params.h b/c/enc/params.h
index 6ecf1d3..bc4f74a 100755
--- a/c/enc/params.h
+++ b/c/enc/params.h
@@ -38,7 +38,7 @@
BROTLI_BOOL large_window;
BrotliHasherParams hasher;
BrotliDistanceParams dist;
- BrotliEncoderDictionary dictionary;
+ SharedEncoderDictionary dictionary;
} BrotliEncoderParams;
#endif /* BROTLI_ENC_PARAMS_H_ */
diff --git a/c/enc/static_dict.c b/c/enc/static_dict.c
index 7299ab7..c0e0ec4 100644
--- a/c/enc/static_dict.c
+++ b/c/enc/static_dict.c
@@ -74,10 +74,25 @@
}
}
-BROTLI_BOOL BrotliFindAllStaticDictionaryMatches(
+/* Finds matches for a single static dictionary */
+static BROTLI_BOOL BrotliFindAllStaticDictionaryMatchesFor(
const BrotliEncoderDictionary* dictionary, const uint8_t* data,
size_t min_length, size_t max_length, uint32_t* matches) {
BROTLI_BOOL has_found_match = BROTLI_FALSE;
+ if (dictionary->has_words_heavy) {
+ const BrotliTrieNode* node = &dictionary->trie.root;
+ size_t l = 0;
+ while (node && l < max_length) {
+ uint8_t c;
+ if (l >= min_length && node->len_) {
+ AddMatch(node->idx_, l, node->len_, matches);
+ has_found_match = BROTLI_TRUE;
+ }
+ c = data[l++];
+ node = BrotliTrieSub(&dictionary->trie, node, c);
+ }
+ return has_found_match;
+ }
{
size_t offset = dictionary->buckets[Hash(data)];
BROTLI_BOOL end = !offset;
@@ -481,6 +496,45 @@
return has_found_match;
}
+/* Finds matches for one or more dictionaries, if multiple are present
+ in the contextual dictionary */
+BROTLI_BOOL BrotliFindAllStaticDictionaryMatches(
+ const BrotliEncoderDictionary* dictionary, const uint8_t* data,
+ size_t min_length, size_t max_length, uint32_t* matches) {
+ BROTLI_BOOL has_found_match =
+ BrotliFindAllStaticDictionaryMatchesFor(
+ dictionary, data, min_length, max_length, matches);
+
+ if (!!dictionary->parent && dictionary->parent->num_dictionaries > 1) {
+ uint32_t matches2[BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN + 1];
+ int l;
+ const BrotliEncoderDictionary* dictionary2 = dictionary->parent->dict[0];
+ if (dictionary2 == dictionary) {
+ dictionary2 = dictionary->parent->dict[1];
+ }
+
+ for (l = 0; l < BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN + 1; l++) {
+ matches2[l] = kInvalidMatch;
+ }
+
+ has_found_match |= BrotliFindAllStaticDictionaryMatchesFor(
+ dictionary2, data, min_length, max_length, matches2);
+
+ for (l = 0; l < BROTLI_MAX_STATIC_DICTIONARY_MATCH_LEN + 1; l++) {
+ if (matches2[l] != kInvalidMatch) {
+ uint32_t dist = (uint32_t)(matches2[l] >> 5);
+ uint32_t len_code = matches2[l] & 31;
+ uint32_t skipdist = (uint32_t)((uint32_t)(1 << dictionary->words->
+ size_bits_by_length[len_code]) & ~1u) *
+ (uint32_t)dictionary->num_transforms;
+ /* TODO: check for dist overflow */
+ dist += skipdist;
+ AddMatch(dist, (size_t)l, len_code, matches);
+ }
+ }
+ }
+ return has_found_match;
+}
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
#endif
diff --git a/c/include/brotli/decode.h b/c/include/brotli/decode.h
index 0f5c8f9..ba9ea2a 100644
--- a/c/include/brotli/decode.h
+++ b/c/include/brotli/decode.h
@@ -13,6 +13,7 @@
#define BROTLI_DEC_DECODE_H_
#include <brotli/port.h>
+#include <brotli/shared_dictionary.h>
#include <brotli/types.h>
#if defined(__cplusplus) || defined(c_plusplus)
@@ -246,6 +247,9 @@
BROTLI_DEC_API BrotliDecoderResult BrotliDecoderDecompressStream(
BrotliDecoderState* state, size_t* available_in, const uint8_t** next_in,
size_t* available_out, uint8_t** next_out, size_t* total_out);
+BROTLI_DEC_API BROTLI_BOOL BrotliDecoderAttachDictionary(
+ BrotliDecoderState* state, BrotliSharedDictionaryType type,
+ const uint8_t* data, size_t size);
/**
* Checks if decoder has more output.
diff --git a/c/include/brotli/encode.h b/c/include/brotli/encode.h
index 0ced7e5..8a90671 100644
--- a/c/include/brotli/encode.h
+++ b/c/include/brotli/encode.h
@@ -13,6 +13,7 @@
#define BROTLI_ENC_ENCODE_H_
#include <brotli/port.h>
+#include <brotli/shared_dictionary.h>
#include <brotli/types.h>
#if defined(__cplusplus) || defined(c_plusplus)
@@ -253,6 +254,50 @@
*/
BROTLI_ENC_API void BrotliEncoderDestroyInstance(BrotliEncoderState* state);
+/* Opaque type for pointer to different possible internal structures containing
+ dictionary prepared for the encoder */
+typedef struct BrotliEncoderPreparedDictionaryStruct
+ BrotliEncoderPreparedDictionary;
+
+/**
+ * Prepares a shared dictionary from the given file format for the encoder.
+ *
+ * @p alloc_func and @p free_func @b MUST be both zero or both non-zero. In the
+ * case they are both zero, default memory allocators are used. @p opaque is
+ * passed to @p alloc_func and @p free_func when they are called. @p free_func
+ * has to return without doing anything when asked to free a NULL pointer.
+ *
+ * @param data pointer to raw dictionary data buffer
+ * @param size size of @p data buffer
+ * @param type the file format of the data
+ * @param quality the maximum Brotli quality to prepare the dictionary for,
+ * use BROTLI_MAX_QUALITY by default
+ * @param alloc_func custom memory allocation function
+ * @param free_func custom memory free function
+ * @param opaque custom memory manager handle
+ */
+BROTLI_ENC_API BrotliEncoderPreparedDictionary*
+BrotliEncoderPrepareDictionary(const uint8_t* data, size_t size,
+ BrotliSharedDictionaryType type, int quality,
+ brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque);
+
+BROTLI_ENC_API void BrotliEncoderDestroyPreparedDictionary(
+ BrotliEncoderPreparedDictionary* dictionary);
+
+/**
+ * Attaches a prepared dictionary of any type to the encoder. Can be used
+ * multiple times to attach multiple dictionaries. The dictionary type was
+ * determined by BrotliEncoderPrepareDictionary. Multiple raw prefix
+ * dictionaries and/or max 1 serialized dictionary with custom words can be
+ * attached.
+ *
+ * @returns ::BROTLI_FALSE in case of error
+ * @returns ::BROTLI_TRUE otherwise
+ */
+BROTLI_ENC_API BROTLI_BOOL BrotliEncoderAttachPreparedDictionary(
+ BrotliEncoderState* state,
+ const BrotliEncoderPreparedDictionary* dictionary);
+
/**
* Calculates the output size bound for the given @p input_size.
*
diff --git a/c/include/brotli/shared_dictionary.h b/c/include/brotli/shared_dictionary.h
new file mode 100755
index 0000000..3f21c07
--- /dev/null
+++ b/c/include/brotli/shared_dictionary.h
@@ -0,0 +1,59 @@
+#ifndef BROTLI_COMMON_SHARED_DICTIONARY_H_
+#define BROTLI_COMMON_SHARED_DICTIONARY_H_
+
+#include <brotli/port.h>
+#include <brotli/types.h>
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#define SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH 4
+#define SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH 31
+#define SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS 64
+#define SHARED_BROTLI_MAX_COMPOUND_DICTS 15
+
+typedef struct BrotliSharedDictionaryStruct BrotliSharedDictionary;
+
+typedef enum BrotliSharedDictionaryType {
+ /* A generic raw file as prefix (compound) dictionary. */
+ BROTLI_SHARED_DICTIONARY_RAW = 0,
+ /* A file in the shared dictionary format, can replace words and/or contain
+ multiple compound dictionaries. */
+ BROTLI_SHARED_DICTIONARY_SERIALIZED = 1
+} BrotliSharedDictionaryType;
+
+/**
+ * Creates an instance of shared dictionary.
+ *
+ * Fresh instance has default word dictionary and transforms
+ * and no LZ77 prefix dictionary.
+ *
+ * @p alloc_func and @p free_func @b MUST be both zero or both non-zero. In the
+ * case they are both zero, default memory allocators are used. @p opaque is
+ * passed to @p alloc_func and @p free_func when they are called. @p free_func
+ * has to return without doing anything when asked to free a NULL pointer.
+ *
+ * @param alloc_func custom memory allocation function
+ * @param free_func custom memory free function
+ * @param opaque custom memory manager handle
+ * @returns @c 0 if instance can not be allocated or initialized
+ * @returns pointer to initialized ::BrotliDecoderState otherwise
+ */
+BROTLI_COMMON_API BrotliSharedDictionary* BrotliSharedDictionaryCreateInstance(
+ brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque);
+
+/* Deinitializes and frees ::BrotliSharedDictionary instance. */
+BROTLI_COMMON_API void BrotliSharedDictionaryDestroyInstance(
+ BrotliSharedDictionary* dict);
+
+/* Attaches one dictionary to another, to combine compound dictionaries. */
+BROTLI_COMMON_API BROTLI_BOOL BrotliSharedDictionaryAttach(
+ BrotliSharedDictionary* dict, BrotliSharedDictionaryType type,
+ const uint8_t* data, size_t size);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} /* extern "C" */
+#endif
+
+#endif /* BROTLI_COMMON_SHARED_DICTIONARY_H_ */
diff --git a/c/tools/brotli.c b/c/tools/brotli.c
index ea4fdac..78fe078 100644
--- a/c/tools/brotli.c
+++ b/c/tools/brotli.c
@@ -95,6 +95,7 @@
BROTLI_BOOL decompress;
BROTLI_BOOL large_window;
const char* output_path;
+ const char* dictionary_path;
const char* suffix;
int not_input_indices[MAX_OPTIONS];
size_t longest_path_len;
@@ -103,6 +104,9 @@
/* Inner state */
int argc;
char** argv;
+ uint8_t* dictionary;
+ size_t dictionary_size;
+ BrotliEncoderPreparedDictionary* prepared_dictionary;
char* modified_path; /* Storage for path with appended / cut suffix */
int iterator;
int ignore;
@@ -346,6 +350,12 @@
params->lgwin, BROTLI_MIN_WINDOW_BITS);
return COMMAND_INVALID;
}
+ } else if (c == 'D') {
+ if (params->dictionary_path) {
+ fprintf(stderr, "dictionary path already set\n");
+ return COMMAND_INVALID;
+ }
+ params->dictionary_path = argv[i];
} else if (c == 'S') {
if (suffix_set) {
fprintf(stderr, "suffix already set\n");
@@ -433,7 +443,13 @@
}
key_len = (size_t)(value - arg);
value++;
- if (strncmp("lgwin", arg, key_len) == 0) {
+ if (strncmp("dictionary", arg, key_len) == 0) {
+ if (params->dictionary_path) {
+ fprintf(stderr, "dictionary path already set\n");
+ return COMMAND_INVALID;
+ }
+ params->dictionary_path = value;
+ } else if (strncmp("lgwin", arg, key_len) == 0) {
if (lgwin_set) {
fprintf(stderr, "lgwin parameter already set\n");
return COMMAND_INVALID;
@@ -554,7 +570,8 @@
BROTLI_MIN_WINDOW_BITS, BROTLI_MAX_WINDOW_BITS);
fprintf(media,
" window size = 2**NUM - 16\n"
-" 0 lets compressor choose the optimal value\n");
+" 0 lets compressor choose the optimal value\n"
+" -D FILE, --dictionary=FILE use FILE as raw (LZ77) dictionary\n");
fprintf(media,
" -S SUF, --suffix=SUF output file suffix (default:'%s')\n",
DEFAULT_SUFFIX);
@@ -659,6 +676,69 @@
}
}
+/* Result ownership is passed to caller.
+ |*dictionary_size| is set to resulting buffer size. */
+static BROTLI_BOOL ReadDictionary(Context* context, Command command) {
+ static const int kMaxDictionarySize =
+ BROTLI_MAX_DISTANCE - BROTLI_MAX_BACKWARD_LIMIT(24);
+ FILE* f;
+ int64_t file_size_64;
+ uint8_t* buffer;
+ size_t bytes_read;
+
+ if (context->dictionary_path == NULL) return BROTLI_TRUE;
+ f = fopen(context->dictionary_path, "rb");
+ if (f == NULL) {
+ fprintf(stderr, "failed to open dictionary file [%s]: %s\n",
+ PrintablePath(context->dictionary_path), strerror(errno));
+ return BROTLI_FALSE;
+ }
+
+ file_size_64 = FileSize(context->dictionary_path);
+ if (file_size_64 == -1) {
+ fprintf(stderr, "could not get size of dictionary file [%s]",
+ PrintablePath(context->dictionary_path));
+ fclose(f);
+ return BROTLI_FALSE;
+ }
+
+ if (file_size_64 > kMaxDictionarySize) {
+ fprintf(stderr, "dictionary [%s] is larger than maximum allowed: %d\n",
+ PrintablePath(context->dictionary_path), kMaxDictionarySize);
+ fclose(f);
+ return BROTLI_FALSE;
+ }
+ context->dictionary_size = (size_t)file_size_64;
+
+ buffer = (uint8_t*)malloc(context->dictionary_size);
+ if (!buffer) {
+ fprintf(stderr, "could not read dictionary: out of memory\n");
+ fclose(f);
+ return BROTLI_FALSE;
+ }
+ bytes_read = fread(buffer, sizeof(uint8_t), context->dictionary_size, f);
+ if (bytes_read != context->dictionary_size) {
+ free(buffer);
+ fprintf(stderr, "failed to read dictionary [%s]: %s\n",
+ PrintablePath(context->dictionary_path), strerror(errno));
+ fclose(f);
+ return BROTLI_FALSE;
+ }
+ fclose(f);
+ context->dictionary = buffer;
+ if (command == COMMAND_COMPRESS) {
+ context->prepared_dictionary = BrotliEncoderPrepareDictionary(
+ context->dictionary, context->dictionary_size, 0, BROTLI_MAX_QUALITY,
+ NULL, NULL, NULL);
+ if (context->prepared_dictionary == NULL) {
+ fprintf(stderr, "failed to prepare dictionary [%s]\n",
+ PrintablePath(context->dictionary_path));
+ return BROTLI_FALSE;
+ }
+ }
+ return BROTLI_TRUE;
+}
+
static BROTLI_BOOL NextFile(Context* context) {
const char* arg;
size_t arg_len;
@@ -877,6 +957,10 @@
fragmentation (new builds decode streams that old builds don't),
it is better from used experience perspective. */
BrotliDecoderSetParameter(s, BROTLI_DECODER_PARAM_LARGE_WINDOW, 1u);
+ if (context->dictionary) {
+ BrotliDecoderAttachDictionary(s, BROTLI_SHARED_DICTIONARY_RAW,
+ context->dictionary, context->dictionary_size);
+ }
is_ok = OpenFiles(context);
if (is_ok && !context->current_input_path &&
!context->force_overwrite && isatty(STDIN_FILENO)) {
@@ -958,6 +1042,9 @@
(uint32_t)context->input_file_length : (1u << 30);
BrotliEncoderSetParameter(s, BROTLI_PARAM_SIZE_HINT, size_hint);
}
+ if (context->dictionary) {
+ BrotliEncoderAttachPreparedDictionary(s, context->prepared_dictionary);
+ }
is_ok = OpenFiles(context);
if (is_ok && !context->current_output_path &&
!context->force_overwrite && isatty(STDOUT_FILENO)) {
@@ -989,6 +1076,7 @@
context.decompress = BROTLI_FALSE;
context.large_window = BROTLI_FALSE;
context.output_path = NULL;
+ context.dictionary_path = NULL;
context.suffix = DEFAULT_SUFFIX;
for (i = 0; i < MAX_OPTIONS; ++i) context.not_input_indices[i] = 0;
context.longest_path_len = 1;
@@ -996,6 +1084,9 @@
context.argc = argc;
context.argv = argv;
+ context.dictionary = NULL;
+ context.dictionary_size = 0;
+ context.prepared_dictionary = NULL;
context.modified_path = NULL;
context.iterator = 0;
context.ignore = 0;
@@ -1010,6 +1101,7 @@
if (command == COMMAND_COMPRESS || command == COMMAND_DECOMPRESS ||
command == COMMAND_TEST_INTEGRITY) {
+ if (!ReadDictionary(&context, command)) is_ok = BROTLI_FALSE;
if (is_ok) {
size_t modified_path_len =
context.longest_path_len + strlen(context.suffix) + 1;
@@ -1054,6 +1146,8 @@
if (context.iterator_error) is_ok = BROTLI_FALSE;
+ BrotliEncoderDestroyPreparedDictionary(context.prepared_dictionary);
+ free(context.dictionary);
free(context.modified_path);
free(context.buffer);
diff --git a/c/tools/brotli.md b/c/tools/brotli.md
index c029869..86253b8 100644
--- a/c/tools/brotli.md
+++ b/c/tools/brotli.md
@@ -84,6 +84,9 @@
`(2**NUM - 16)`; 0 lets compressor decide over the optimal value; bigger
windows size improve density; decoder might require up to window size
memory to operate
+* `-D FILE`, `--dictionary=FILE`:
+ use FILE as raw (LZ77) dictionary; same dictionary MUST be used both for
+ compression and decompression
* `-S SUF`, `--suffix=SUF`:
output file suffix (default: `.br`)
* `-V`, `--version`:
diff --git a/docs/brotli.1 b/docs/brotli.1
index 7242a32..43cef62 100644
--- a/docs/brotli.1
+++ b/docs/brotli.1
@@ -1,4 +1,4 @@
-.TH "BROTLI" "1" "February 2018" "brotli 1.0.0" "User commands"
+.TH "BROTLI" "1" "March 2018" "brotli 1.0.0" "User commands"
.SH "NAME"
\fBbrotli\fR \- brotli, unbrotli \- compress or decompress files
.SH SYNOPSIS
@@ -108,6 +108,10 @@
windows size improve density; decoder might require up to window size
memory to operate
.IP \(bu 2
+\fB\-D FILE\fP, \fB\-\-dictionary=FILE\fP:
+ use FILE as raw (LZ77) dictionary; same dictionary MUST be used both for
+ compression and decompression
+.IP \(bu 2
\fB\-S SUF\fP, \fB\-\-suffix=SUF\fP:
output file suffix (default: \fB\|\.br\fP)
.IP \(bu 2
diff --git a/docs/decode.h.3 b/docs/decode.h.3
index 7b8581c..8c5b806 100644
--- a/docs/decode.h.3
+++ b/docs/decode.h.3
@@ -1,4 +1,4 @@
-.TH "decode.h" 3 "Thu Feb 22 2018" "Brotli" \" -*- nroff -*-
+.TH "decode.h" 3 "Fri Mar 2 2018" "Brotli" \" -*- nroff -*-
.ad l
.nh
.SH NAME
diff --git a/docs/encode.h.3 b/docs/encode.h.3
index eff57bd..6d949b3 100644
--- a/docs/encode.h.3
+++ b/docs/encode.h.3
@@ -1,4 +1,4 @@
-.TH "encode.h" 3 "Thu Feb 22 2018" "Brotli" \" -*- nroff -*-
+.TH "encode.h" 3 "Fri Mar 2 2018" "Brotli" \" -*- nroff -*-
.ad l
.nh
.SH NAME
@@ -76,6 +76,10 @@
.in +1c
.ti -1c
+.RI "\fBBROTLI_BOOL\fP \fBBrotliEncoderAttachPreparedDictionary\fP (\fBBrotliEncoderState\fP *state, const BrotliEncoderPreparedDictionary *dictionary)"
+.br
+.RI "\fIAttaches a prepared dictionary of any type to the encoder\&. \fP"
+.ti -1c
.RI "\fBBROTLI_BOOL\fP \fBBrotliEncoderCompress\fP (int quality, int lgwin, \fBBrotliEncoderMode\fP mode, size_t input_size, const uint8_t input_buffer[input_size], size_t *encoded_size, uint8_t encoded_buffer[*encoded_size])"
.br
.RI "\fIPerforms one-shot memory-to-memory compression\&. \fP"
@@ -104,6 +108,10 @@
.br
.RI "\fICalculates the output size bound for the given \fCinput_size\fP\&. \fP"
.ti -1c
+.RI "BrotliEncoderPreparedDictionary * \fBBrotliEncoderPrepareDictionary\fP (const uint8_t *data, size_t size, BrotliSharedDictionaryType type, int quality, \fBbrotli_alloc_func\fP alloc_func, \fBbrotli_free_func\fP free_func, void *opaque)"
+.br
+.RI "\fIPrepares a shared dictionary from the given file format for the encoder\&. \fP"
+.ti -1c
.RI "\fBBROTLI_BOOL\fP \fBBrotliEncoderSetParameter\fP (\fBBrotliEncoderState\fP *state, \fBBrotliEncoderParameter\fP param, uint32_t value)"
.br
.RI "\fISets the specified parameter to the given encoder instance\&. \fP"
@@ -306,6 +314,19 @@
Range is from 0 to (15 << NPOSTFIX) in steps of (1 << NPOSTFIX)\&.
.SH "Function Documentation"
.PP
+.SS "\fBBROTLI_BOOL\fP BrotliEncoderAttachPreparedDictionary (\fBBrotliEncoderState\fP * state, const BrotliEncoderPreparedDictionary * dictionary)"
+
+.PP
+Attaches a prepared dictionary of any type to the encoder\&. Can be used multiple times to attach multiple dictionaries\&. The dictionary type was determined by BrotliEncoderPrepareDictionary\&. Multiple raw prefix dictionaries and/or max 1 serialized dictionary with custom words can be attached\&.
+.PP
+\fBReturns:\fP
+.RS 4
+\fBBROTLI_FALSE\fP in case of error
+.PP
+\fBBROTLI_TRUE\fP otherwise
+.RE
+.PP
+
.SS "\fBBROTLI_BOOL\fP BrotliEncoderCompress (int quality, int lgwin, \fBBrotliEncoderMode\fP mode, size_t input_size, const uint8_t input_buffer[input_size], size_t * encoded_size, uint8_t encoded_buffer[*encoded_size])"
.PP
@@ -495,6 +516,29 @@
.RE
.PP
+.SS "BrotliEncoderPreparedDictionary* BrotliEncoderPrepareDictionary (const uint8_t * data, size_t size, BrotliSharedDictionaryType type, int quality, \fBbrotli_alloc_func\fP alloc_func, \fBbrotli_free_func\fP free_func, void * opaque)"
+
+.PP
+Prepares a shared dictionary from the given file format for the encoder\&. \fCalloc_func\fP and \fCfree_func\fP \fBMUST\fP be both zero or both non-zero\&. In the case they are both zero, default memory allocators are used\&. \fCopaque\fP is passed to \fCalloc_func\fP and \fCfree_func\fP when they are called\&. \fCfree_func\fP has to return without doing anything when asked to free a NULL pointer\&.
+.PP
+\fBParameters:\fP
+.RS 4
+\fIdata\fP pointer to raw dictionary data buffer
+.br
+\fIsize\fP size of \fCdata\fP buffer
+.br
+\fItype\fP the file format of the data
+.br
+\fIquality\fP the maximum Brotli quality to prepare the dictionary for, use BROTLI_MAX_QUALITY by default
+.br
+\fIalloc_func\fP custom memory allocation function
+.br
+\fIfree_func\fP custom memory free function
+.br
+\fIopaque\fP custom memory manager handle
+.RE
+.PP
+
.SS "\fBBROTLI_BOOL\fP BrotliEncoderSetParameter (\fBBrotliEncoderState\fP * state, \fBBrotliEncoderParameter\fP param, uint32_t value)"
.PP
diff --git a/docs/types.h.3 b/docs/types.h.3
index bef9313..618b02b 100644
--- a/docs/types.h.3
+++ b/docs/types.h.3
@@ -1,4 +1,4 @@
-.TH "types.h" 3 "Thu Feb 22 2018" "Brotli" \" -*- nroff -*-
+.TH "types.h" 3 "Fri Mar 2 2018" "Brotli" \" -*- nroff -*-
.ad l
.nh
.SH NAME
diff --git a/java/org/brotli/wrapper/dec/BrotliDecoderChannel.java b/java/org/brotli/wrapper/dec/BrotliDecoderChannel.java
index 6dfe8f2..30f6f1d 100644
--- a/java/org/brotli/wrapper/dec/BrotliDecoderChannel.java
+++ b/java/org/brotli/wrapper/dec/BrotliDecoderChannel.java
@@ -36,6 +36,11 @@
}
@Override
+ public void attachDictionary(ByteBuffer dictionary) throws IOException {
+ super.attachDictionary(dictionary);
+ }
+
+ @Override
public boolean isOpen() {
synchronized (mutex) {
return !closed;
diff --git a/java/org/brotli/wrapper/dec/BrotliInputStream.java b/java/org/brotli/wrapper/dec/BrotliInputStream.java
index 26f7a82..d7c6144 100644
--- a/java/org/brotli/wrapper/dec/BrotliInputStream.java
+++ b/java/org/brotli/wrapper/dec/BrotliInputStream.java
@@ -8,6 +8,7 @@
import java.io.IOException;
import java.io.InputStream;
+import java.nio.ByteBuffer;
import java.nio.channels.Channels;
/**
@@ -34,6 +35,10 @@
this(source, DEFAULT_BUFFER_SIZE);
}
+ public void attachDictionary(ByteBuffer dictionary) throws IOException {
+ decoder.attachDictionary(dictionary);
+ }
+
public void setEager(boolean eager) {
decoder.setEager(eager);
}
diff --git a/java/org/brotli/wrapper/dec/Decoder.java b/java/org/brotli/wrapper/dec/Decoder.java
index ae4d817..7815e2b 100644
--- a/java/org/brotli/wrapper/dec/Decoder.java
+++ b/java/org/brotli/wrapper/dec/Decoder.java
@@ -50,6 +50,12 @@
throw new IOException(message);
}
+ void attachDictionary(ByteBuffer dictionary) throws IOException {
+ if (!decoder.attachDictionary(dictionary)) {
+ fail("failed to attach dictionary");
+ }
+ }
+
public void setEager(boolean eager) {
this.eager = eager;
}
diff --git a/java/org/brotli/wrapper/dec/DecoderJNI.java b/java/org/brotli/wrapper/dec/DecoderJNI.java
index 320705c..fc5225d 100644
--- a/java/org/brotli/wrapper/dec/DecoderJNI.java
+++ b/java/org/brotli/wrapper/dec/DecoderJNI.java
@@ -17,6 +17,7 @@
private static native void nativePush(long[] context, int length);
private static native ByteBuffer nativePull(long[] context);
private static native void nativeDestroy(long[] context);
+ private static native boolean nativeAttachDictionary(long[] context, ByteBuffer dictionary);
public enum Status {
ERROR,
@@ -30,6 +31,7 @@
private final long[] context = new long[3];
private final ByteBuffer inputBuffer;
private Status lastStatus = Status.NEEDS_MORE_INPUT;
+ private boolean fresh = true;
public Wrapper(int inputBufferSize) throws IOException {
this.context[1] = inputBufferSize;
@@ -39,6 +41,19 @@
}
}
+ public boolean attachDictionary(ByteBuffer dictionary) {
+ if (!dictionary.isDirect()) {
+ throw new IllegalArgumentException("only direct buffers allowed");
+ }
+ if (context[0] == 0) {
+ throw new IllegalStateException("brotli decoder is already destroyed");
+ }
+ if (!fresh) {
+ throw new IllegalStateException("decoding is already started");
+ }
+ return nativeAttachDictionary(context, dictionary);
+ }
+
public void push(int length) {
if (length < 0) {
throw new IllegalArgumentException("negative block length");
@@ -52,6 +67,7 @@
if (lastStatus == Status.OK && length != 0) {
throw new IllegalStateException("pushing input to decoder in OK state");
}
+ fresh = false;
nativePush(context, length);
parseStatus();
}
@@ -90,6 +106,7 @@
if (lastStatus != Status.NEEDS_MORE_OUTPUT && !hasOutput()) {
throw new IllegalStateException("pulling output from decoder in " + lastStatus + " state");
}
+ fresh = false;
ByteBuffer result = nativePull(context);
parseStatus();
return result;
diff --git a/java/org/brotli/wrapper/dec/decoder_jni.cc b/java/org/brotli/wrapper/dec/decoder_jni.cc
index 268a10b..07bc1d9 100644
--- a/java/org/brotli/wrapper/dec/decoder_jni.cc
+++ b/java/org/brotli/wrapper/dec/decoder_jni.cc
@@ -15,6 +15,9 @@
typedef struct DecoderHandle {
BrotliDecoderState* state;
+ jobject dictionary_refs[15];
+ size_t dictionary_count;
+
uint8_t* input_start;
size_t input_offset;
size_t input_length;
@@ -54,6 +57,10 @@
ok = !!handle;
if (ok) {
+ for (int i = 0; i < 15; ++i) {
+ handle->dictionary_refs[i] = nullptr;
+ }
+ handle->dictionary_count = 0;
handle->input_offset = 0;
handle->input_length = 0;
handle->input_start = nullptr;
@@ -193,10 +200,53 @@
env->GetLongArrayRegion(ctx, 0, 3, context);
DecoderHandle* handle = getHandle(reinterpret_cast<void*>(context[0]));
BrotliDecoderDestroyInstance(handle->state);
+ for (size_t i = 0; i < handle->dictionary_count; ++i) {
+ env->DeleteGlobalRef(handle->dictionary_refs[i]);
+ }
delete[] handle->input_start;
delete handle;
}
+JNIEXPORT jboolean JNICALL
+Java_org_brotli_wrapper_dec_DecoderJNI_nativeAttachDictionary(
+ JNIEnv* env, jobject /*jobj*/, jlongArray ctx, jobject dictionary) {
+ jlong context[3];
+ env->GetLongArrayRegion(ctx, 0, 3, context);
+ DecoderHandle* handle = getHandle(reinterpret_cast<void*>(context[0]));
+ jobject ref = nullptr;
+ uint8_t* address = nullptr;
+ jlong capacity = 0;
+
+ bool ok = true;
+ if (ok && !dictionary) {
+ ok = false;
+ }
+ if (ok && handle->dictionary_count >= 15) {
+ ok = false;
+ }
+ if (ok) {
+ ref = env->NewGlobalRef(dictionary);
+ ok = !!ref;
+ }
+ if (ok) {
+ handle->dictionary_refs[handle->dictionary_count] = ref;
+ handle->dictionary_count++;
+ address = static_cast<uint8_t*>(env->GetDirectBufferAddress(ref));
+ ok = !!address;
+ }
+ if (ok) {
+ capacity = env->GetDirectBufferCapacity(ref);
+ ok = (capacity > 0) && (capacity < (1 << 30));
+ }
+ if (ok) {
+ size_t size = static_cast<size_t>(capacity);
+ ok = !!BrotliDecoderAttachDictionary(handle->state,
+ BROTLI_SHARED_DICTIONARY_RAW, address, size);
+ }
+
+ return static_cast<jboolean>(ok);
+}
+
#ifdef __cplusplus
}
#endif
diff --git a/java/org/brotli/wrapper/enc/BrotliEncoderChannel.java b/java/org/brotli/wrapper/enc/BrotliEncoderChannel.java
index 047c356..1941b27 100644
--- a/java/org/brotli/wrapper/enc/BrotliEncoderChannel.java
+++ b/java/org/brotli/wrapper/enc/BrotliEncoderChannel.java
@@ -43,6 +43,11 @@
}
@Override
+ public void attachDictionary(PreparedDictionary dictionary) throws IOException {
+ super.attachDictionary(dictionary);
+ }
+
+ @Override
public boolean isOpen() {
synchronized (mutex) {
return !closed;
diff --git a/java/org/brotli/wrapper/enc/BrotliOutputStream.java b/java/org/brotli/wrapper/enc/BrotliOutputStream.java
index 5bd3957..8ea9afe 100644
--- a/java/org/brotli/wrapper/enc/BrotliOutputStream.java
+++ b/java/org/brotli/wrapper/enc/BrotliOutputStream.java
@@ -40,6 +40,10 @@
this(destination, new Encoder.Parameters());
}
+ public void attachDictionary(PreparedDictionary dictionary) throws IOException {
+ encoder.attachDictionary(dictionary);
+ }
+
@Override
public void close() throws IOException {
encoder.close();
diff --git a/java/org/brotli/wrapper/enc/Encoder.java b/java/org/brotli/wrapper/enc/Encoder.java
index 1fde8d6..8802159 100644
--- a/java/org/brotli/wrapper/enc/Encoder.java
+++ b/java/org/brotli/wrapper/enc/Encoder.java
@@ -11,6 +11,7 @@
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
import java.util.ArrayList;
+import java.util.List;
/**
* Base class for OutputStream / Channel implementations.
@@ -21,6 +22,7 @@
private ByteBuffer buffer;
final ByteBuffer inputBuffer;
boolean closed;
+ List<PreparedDictionary> nativeDictionaries;
/**
* Brotli encoder settings.
@@ -74,6 +76,7 @@
if (destination == null) {
throw new NullPointerException("destination can not be null");
}
+ this.nativeDictionaries = new ArrayList<PreparedDictionary>();
this.destination = destination;
this.encoder = new EncoderJNI.Wrapper(inputBufferSize, params.quality, params.lgwin);
this.inputBuffer = this.encoder.getInputBuffer();
@@ -88,6 +91,16 @@
throw new IOException(message);
}
+ public void attachDictionary(PreparedDictionary dictionary) throws IOException {
+ if (!encoder.attachDictionary(dictionary.data)) {
+ fail("failed to attach dictionary");
+ }
+ // Only byte buffer is held by native encoder -> reference to wrapper should be held here.
+ if (dictionary.isNative) {
+ nativeDictionaries.add(dictionary);
+ }
+ }
+
/**
* @param force repeat pushing until all output is consumed
* @return true if all encoder output is consumed
@@ -202,4 +215,12 @@
public static byte[] compress(byte[] data) throws IOException {
return compress(data, new Parameters());
}
+
+ public static PreparedDictionary prepareDictionary(ByteBuffer dictionary) {
+ ByteBuffer data = EncoderJNI.prepareDictionary(dictionary);
+ if (data == null) {
+ throw new IllegalStateException("OOM");
+ }
+ return new PreparedDictionary(data, true);
+ }
}
diff --git a/java/org/brotli/wrapper/enc/EncoderJNI.java b/java/org/brotli/wrapper/enc/EncoderJNI.java
index 6627f5a..7054d66 100644
--- a/java/org/brotli/wrapper/enc/EncoderJNI.java
+++ b/java/org/brotli/wrapper/enc/EncoderJNI.java
@@ -17,6 +17,9 @@
private static native void nativePush(long[] context, int length);
private static native ByteBuffer nativePull(long[] context);
private static native void nativeDestroy(long[] context);
+ private static native boolean nativeAttachDictionary(long[] context, ByteBuffer dictionary);
+ private static native ByteBuffer nativePrepareDictionary(ByteBuffer dictionary, long type);
+ private static native void nativeDestroyDictionary(ByteBuffer dictionary);
enum Operation {
PROCESS,
@@ -24,12 +27,31 @@
FINISH
}
+ static ByteBuffer prepareDictionary(ByteBuffer dictionary) {
+ if (!dictionary.isDirect()) {
+ throw new IllegalArgumentException("only direct buffers allowed");
+ }
+ return nativePrepareDictionary(dictionary, 0);
+ }
+
+ static void destroyDictionary(ByteBuffer dictionary) {
+ if (!dictionary.isDirect()) {
+ throw new IllegalArgumentException("only direct buffers allowed");
+ }
+ // TODO: add a seal to ensure that this buffer is from native code.
+ nativeDestroyDictionary(dictionary);
+ }
+
static class Wrapper {
protected final long[] context = new long[5];
private final ByteBuffer inputBuffer;
+ private boolean fresh = true;
Wrapper(int inputBufferSize, int quality, int lgwin)
throws IOException {
+ if (inputBufferSize <= 0) {
+ throw new IOException("buffer size must be positive");
+ }
this.context[1] = inputBufferSize;
this.context[2] = quality;
this.context[3] = lgwin;
@@ -42,6 +64,19 @@
this.context[3] = 0;
}
+ boolean attachDictionary(ByteBuffer dictionary) {
+ if (!dictionary.isDirect()) {
+ throw new IllegalArgumentException("only direct buffers allowed");
+ }
+ if (context[0] == 0) {
+ throw new IllegalStateException("brotli decoder is already destroyed");
+ }
+ if (!fresh) {
+ throw new IllegalStateException("decoding is already started");
+ }
+ return nativeAttachDictionary(context, dictionary);
+ }
+
void push(Operation op, int length) {
if (length < 0) {
throw new IllegalArgumentException("negative block length");
@@ -56,6 +91,7 @@
throw new IllegalStateException("pushing input to encoder over previous input");
}
context[1] = op.ordinal();
+ fresh = false;
nativePush(context, length);
}
@@ -86,6 +122,7 @@
if (!isSuccess() || !hasMoreOutput()) {
throw new IllegalStateException("pulling while data is not ready");
}
+ fresh = false;
return nativePull(context);
}
diff --git a/java/org/brotli/wrapper/enc/PreparedDictionary.java b/java/org/brotli/wrapper/enc/PreparedDictionary.java
new file mode 100755
index 0000000..c8296c1
--- /dev/null
+++ b/java/org/brotli/wrapper/enc/PreparedDictionary.java
@@ -0,0 +1,36 @@
+/* Copyright 2017 Google Inc. All Rights Reserved.
+
+ Distributed under MIT license.
+ See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+package org.brotli.wrapper.enc;
+
+import java.nio.ByteBuffer;
+
+/**
+ * BrotliEncoderPreparedDictionary holder.
+ */
+public class PreparedDictionary {
+
+ final boolean isNative;
+ ByteBuffer data;
+
+ PreparedDictionary(ByteBuffer data, boolean isNative) {
+ this.data = data;
+ this.isNative = isNative;
+ }
+
+ @Override
+ protected void finalize() throws Throwable {
+ try {
+ if (isNative) {
+ ByteBuffer data = this.data;
+ this.data = null;
+ EncoderJNI.destroyDictionary(data);
+ }
+ } finally {
+ super.finalize();
+ }
+ }
+}
diff --git a/java/org/brotli/wrapper/enc/PreparedDictionaryGenerator.java b/java/org/brotli/wrapper/enc/PreparedDictionaryGenerator.java
new file mode 100755
index 0000000..de63650
--- /dev/null
+++ b/java/org/brotli/wrapper/enc/PreparedDictionaryGenerator.java
@@ -0,0 +1,171 @@
+/* Copyright 2017 Google Inc. All Rights Reserved.
+
+ Distributed under MIT license.
+ See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+package org.brotli.wrapper.enc;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.IntBuffer;
+import java.nio.ShortBuffer;
+
+/**
+ * Java prepared dictionary producer.
+ */
+public class PreparedDictionaryGenerator {
+
+ private static final int MAGIC = 0xDEBCEDE0;
+ private static final long HASH_MULTIPLIER = 0x1fe35a7bd3579bd3L;
+
+ // Disallow instantiation.
+ private PreparedDictionaryGenerator() { }
+
+ public static PreparedDictionary generate(ByteBuffer src) {
+ return generate(src, 17, 3, 40, 5);
+ }
+
+ public static PreparedDictionary generate(ByteBuffer src,
+ int bucketBits, int slotBits, int hashBits, int blockBits) {
+ src.clear(); // Just in case...
+ if (blockBits > 12) {
+ throw new IllegalArgumentException("blockBits is too big");
+ }
+ if (bucketBits >= 24) {
+ throw new IllegalArgumentException("bucketBits is too big");
+ }
+ if (bucketBits - slotBits >= 16) {
+ throw new IllegalArgumentException("slotBits is too small");
+ }
+ int bucketLimit = 1 << blockBits;
+ int numBuckets = 1 << bucketBits;
+ int numSlots = 1 << slotBits;
+ int slotMask = numSlots - 1;
+ int hashShift = 64 - bucketBits;
+ long hashMask = (~0L) >>> (64 - hashBits);
+ int sourceSize = src.capacity();
+ if (sourceSize < 8) {
+ throw new IllegalArgumentException("src is too short");
+ }
+
+ /* Step 1: create "bloated" hasher. */
+ short[] num = new short[numBuckets];
+ int[] bucketHeads = new int[numBuckets];
+ int[] nextBucket = new int[sourceSize];
+
+ long accumulator = 0;
+ for (int i = 0; i < 7; ++i) {
+ accumulator |= (src.get(i) & 0xFFL) << (8 * i);
+ }
+ accumulator <<= 8;
+ /* TODO: apply custom "store" order. */
+ for (int i = 0; i + 7 < sourceSize; ++i) {
+ accumulator = (accumulator >>> 8) | ((src.get(i + 7) & 0xFFL) << 56);
+ long h = (accumulator & hashMask) * HASH_MULTIPLIER;
+ int key = (int) (h >>> hashShift);
+ int count = num[key];
+ nextBucket[i] = (count == 0) ? -1 : bucketHeads[key];
+ bucketHeads[key] = i;
+ count++;
+ if (count > bucketLimit) {
+ count = bucketLimit;
+ }
+ num[key] = (short) count;
+ }
+
+ /* Step 2: find slot limits. */
+ int[] slotLimit = new int[numSlots];
+ int[] slotSize = new int[numSlots];
+ int totalItems = 0;
+ for (int i = 0; i < numSlots; ++i) {
+ boolean overflow = false;
+ slotLimit[i] = bucketLimit;
+ while (true) {
+ overflow = false;
+ int limit = slotLimit[i];
+ int count = 0;
+ for (int j = i; j < numBuckets; j += numSlots) {
+ int size = num[j];
+ /* Last chain may span behind 64K limit; overflow happens only if
+ we are about to use 0xFFFF+ as item offset. */
+ if (count >= 0xFFFF) {
+ overflow = true;
+ break;
+ }
+ if (size > limit) {
+ size = limit;
+ }
+ count += size;
+ }
+ if (!overflow) {
+ slotSize[i] = count;
+ totalItems += count;
+ break;
+ }
+ slotLimit[i]--;
+ }
+ }
+
+ /* Step 3: transfer data to "slim" hasher. */
+ int part0 = 6 * 4;
+ int part1 = numSlots * 4;
+ int part2 = numBuckets * 2;
+ int part3 = totalItems * 4;
+ int allocSize = part0 + part1 + part2 + part3 + sourceSize;
+ ByteBuffer flat = ByteBuffer.allocateDirect(allocSize);
+ ByteBuffer pointer = flat.slice();
+ pointer.order(ByteOrder.nativeOrder());
+
+ IntBuffer struct = pointer.asIntBuffer();
+ pointer.position(pointer.position() + part0);
+ IntBuffer slotOffsets = pointer.asIntBuffer();
+ pointer.position(pointer.position() + part1);
+ ShortBuffer heads = pointer.asShortBuffer();
+ pointer.position(pointer.position() + part2);
+ IntBuffer items = pointer.asIntBuffer();
+ pointer.position(pointer.position() + part3);
+ ByteBuffer sourceCopy = pointer.slice();
+
+ /* magic */ struct.put(0, MAGIC);
+ /* source_offset */ struct.put(1, totalItems);
+ /* source_size */ struct.put(2, sourceSize);
+ /* hash_bits */ struct.put(3, hashBits);
+ /* bucket_bits */ struct.put(4, bucketBits);
+ /* slot_bits */ struct.put(5, slotBits);
+
+ totalItems = 0;
+ for (int i = 0; i < numSlots; ++i) {
+ slotOffsets.put(i, totalItems);
+ totalItems += slotSize[i];
+ slotSize[i] = 0;
+ }
+
+ for (int i = 0; i < numBuckets; ++i) {
+ int slot = i & slotMask;
+ int count = num[i];
+ if (count > slotLimit[slot]) {
+ count = slotLimit[slot];
+ }
+ if (count == 0) {
+ heads.put(i, (short) 0xFFFF);
+ continue;
+ }
+ int cursor = slotSize[slot];
+ heads.put(i, (short) cursor);
+ cursor += slotOffsets.get(slot);
+ slotSize[slot] += count;
+ int pos = bucketHeads[i];
+ for (int j = 0; j < count; j++) {
+ items.put(cursor++, pos);
+ pos = nextBucket[pos];
+ }
+ cursor--;
+ items.put(cursor, items.get(cursor) | 0x80000000);
+ }
+
+ sourceCopy.put(src);
+
+ return new PreparedDictionary(flat, false);
+ }
+}
diff --git a/java/org/brotli/wrapper/enc/UseCompoundDictionaryTest.java b/java/org/brotli/wrapper/enc/UseCompoundDictionaryTest.java
new file mode 100755
index 0000000..106bd4d
--- /dev/null
+++ b/java/org/brotli/wrapper/enc/UseCompoundDictionaryTest.java
@@ -0,0 +1,111 @@
+package org.brotli.wrapper.enc;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.brotli.integration.BrotliJniTestBase;
+import org.brotli.integration.BundleHelper;
+import org.brotli.wrapper.common.BrotliCommon;
+import org.brotli.wrapper.dec.BrotliInputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.util.List;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+import org.junit.runner.RunWith;
+import org.junit.runners.AllTests;
+
+/** Tests for compression / decompression aided with LZ77 dictionary. */
+@RunWith(AllTests.class)
+public class UseCompoundDictionaryTest extends BrotliJniTestBase {
+
+ static InputStream getBundle() throws IOException {
+ return new FileInputStream(System.getProperty("TEST_BUNDLE"));
+ }
+
+ /** Creates a test suite. */
+ public static TestSuite suite() throws IOException {
+ TestSuite suite = new TestSuite();
+ InputStream bundle = getBundle();
+ try {
+ List<String> entries = BundleHelper.listEntries(bundle);
+ for (String entry : entries) {
+ suite.addTest(new UseCompoundDictionaryTestCase(entry));
+ }
+ } finally {
+ bundle.close();
+ }
+ return suite;
+ }
+
+ /** Test case with a unique name. */
+ static class UseCompoundDictionaryTestCase extends TestCase {
+ final String entryName;
+ UseCompoundDictionaryTestCase(String entryName) {
+ super("UseCompoundDictionaryTest." + entryName);
+ this.entryName = entryName;
+ }
+
+ @Override
+ protected void runTest() throws Throwable {
+ UseCompoundDictionaryTest.run(entryName);
+ }
+ }
+
+ private static PreparedDictionary prepareDictionary(String entryName, ByteBuffer data) {
+ if (entryName.endsWith("E.coli.txt")) {
+ // Default prepared dictionary parameters doesn't work well for DNA data.
+ // Should work well with 8-byte hash.
+ return PreparedDictionaryGenerator.generate(data, 17, 3, 64, 5);
+ } else {
+ return Encoder.prepareDictionary(data);
+ }
+ }
+
+ private static void run(String entryName) throws Throwable {
+ InputStream bundle = getBundle();
+ byte[] original;
+ try {
+ original = BundleHelper.readEntry(bundle, entryName);
+ } finally {
+ bundle.close();
+ }
+
+ if (original == null) {
+ throw new RuntimeException("Can't read bundle entry: " + entryName);
+ }
+
+ ByteBuffer dictionary = BrotliCommon.makeNative(original);
+ PreparedDictionary preparedDictionary = prepareDictionary(entryName, dictionary);
+
+ ByteArrayOutputStream dst = new ByteArrayOutputStream();
+ BrotliOutputStream encoder =
+ new BrotliOutputStream(dst, new Encoder.Parameters().setQuality(9).setWindow(23), 1 << 23);
+ encoder.attachDictionary(preparedDictionary);
+ try {
+ encoder.write(original);
+ } finally {
+ encoder.close();
+ }
+
+ byte[] compressed = dst.toByteArray();
+
+ // Just copy self from LZ77 dictionary -> ultimate compression ratio.
+ assertTrue(compressed.length < 80 + original.length / 65536);
+
+ BrotliInputStream decoder =
+ new BrotliInputStream(new ByteArrayInputStream(compressed), 1 << 23);
+ decoder.attachDictionary(dictionary);
+ try {
+ long originalCrc = BundleHelper.fingerprintStream(new ByteArrayInputStream(original));
+ long crc = BundleHelper.fingerprintStream(decoder);
+ assertEquals(originalCrc, crc);
+ } finally {
+ decoder.close();
+ }
+ }
+}
\ No newline at end of file
diff --git a/java/org/brotli/wrapper/enc/encoder_jni.cc b/java/org/brotli/wrapper/enc/encoder_jni.cc
index 5cde6df..94bfbdc 100644
--- a/java/org/brotli/wrapper/enc/encoder_jni.cc
+++ b/java/org/brotli/wrapper/enc/encoder_jni.cc
@@ -15,6 +15,9 @@
typedef struct EncoderHandle {
BrotliEncoderState* state;
+ jobject dictionary_refs[15];
+ size_t dictionary_count;
+
uint8_t* input_start;
size_t input_offset;
size_t input_last;
@@ -53,6 +56,10 @@
ok = !!handle;
if (ok) {
+ for (int i = 0; i < 15; ++i) {
+ handle->dictionary_refs[i] = nullptr;
+ }
+ handle->dictionary_count = 0;
handle->input_offset = 0;
handle->input_last = 0;
handle->input_start = nullptr;
@@ -186,10 +193,90 @@
env->GetLongArrayRegion(ctx, 0, 2, context);
EncoderHandle* handle = getHandle(reinterpret_cast<void*>(context[0]));
BrotliEncoderDestroyInstance(handle->state);
+ for (size_t i = 0; i < handle->dictionary_count; ++i) {
+ env->DeleteGlobalRef(handle->dictionary_refs[i]);
+ }
delete[] handle->input_start;
delete handle;
}
+JNIEXPORT jboolean JNICALL
+Java_org_brotli_wrapper_enc_EncoderJNI_nativeAttachDictionary(
+ JNIEnv* env, jobject /*jobj*/, jlongArray ctx, jobject dictionary) {
+ jlong context[2];
+ env->GetLongArrayRegion(ctx, 0, 2, context);
+ EncoderHandle* handle = getHandle(reinterpret_cast<void*>(context[0]));
+ jobject ref = nullptr;
+ uint8_t* address = nullptr;
+
+ bool ok = true;
+ if (ok && !dictionary) {
+ ok = false;
+ }
+ if (ok && handle->dictionary_count >= 15) {
+ ok = false;
+ }
+ if (ok) {
+ ref = env->NewGlobalRef(dictionary);
+ ok = !!ref;
+ }
+ if (ok) {
+ handle->dictionary_refs[handle->dictionary_count] = ref;
+ handle->dictionary_count++;
+ address = static_cast<uint8_t*>(env->GetDirectBufferAddress(ref));
+ ok = !!address;
+ }
+ if (ok) {
+ ok = !!BrotliEncoderAttachPreparedDictionary(handle->state,
+ reinterpret_cast<BrotliEncoderPreparedDictionary*>(address));
+ }
+
+ return static_cast<jboolean>(ok);
+}
+
+JNIEXPORT void JNICALL
+Java_org_brotli_wrapper_enc_EncoderJNI_nativeDestroyDictionary(
+ JNIEnv* env, jobject /*jobj*/, jobject dictionary) {
+ if (!dictionary) {
+ return;
+ }
+ uint8_t* address =
+ static_cast<uint8_t*>(env->GetDirectBufferAddress(dictionary));
+ if (!address) {
+ return;
+ }
+ BrotliEncoderDestroyPreparedDictionary(
+ reinterpret_cast<BrotliEncoderPreparedDictionary*>(address));
+}
+
+JNIEXPORT jobject JNICALL
+Java_org_brotli_wrapper_enc_EncoderJNI_nativePrepareDictionary(
+ JNIEnv* env, jobject /*jobj*/, jobject dictionary, jlong type) {
+ if (!dictionary) {
+ return nullptr;
+ }
+ uint8_t* address =
+ static_cast<uint8_t*>(env->GetDirectBufferAddress(dictionary));
+ if (!address) {
+ return nullptr;
+ }
+ jlong capacity = env->GetDirectBufferCapacity(dictionary);
+ if ((capacity <= 0) || (capacity >= (1 << 30))) {
+ return nullptr;
+ }
+ BrotliSharedDictionaryType dictionary_type =
+ static_cast<BrotliSharedDictionaryType>(type);
+ size_t size = static_cast<size_t>(capacity);
+ BrotliEncoderPreparedDictionary* prepared_dictionary =
+ BrotliEncoderPrepareDictionary(address, size, dictionary_type,
+ BROTLI_MAX_QUALITY, nullptr, nullptr, nullptr);
+ if (!prepared_dictionary) {
+ return nullptr;
+ }
+ /* Size is 4 - just enough to check magic bytes. */
+ return env->NewDirectByteBuffer(prepared_dictionary, 4);
+}
+
#ifdef __cplusplus
}
#endif
diff --git a/scripts/sources.lst b/scripts/sources.lst
index 5e8e817..7226845 100644
--- a/scripts/sources.lst
+++ b/scripts/sources.lst
@@ -6,6 +6,7 @@
BROTLI_COMMON_C = \
c/common/dictionary.c \
+ c/common/shared_dictionary.c \
c/common/transform.c
BROTLI_COMMON_H = \
@@ -13,6 +14,7 @@
c/common/context.h \
c/common/dictionary.h \
c/common/platform.h \
+ c/common/shared_dictionary_internal.h \
c/common/transform.h \
c/common/version.h
@@ -35,6 +37,7 @@
c/enc/block_splitter.c \
c/enc/brotli_bit_stream.c \
c/enc/cluster.c \
+ c/enc/compound_dictionary.c \
c/enc/compress_fragment.c \
c/enc/compress_fragment_two_pass.c \
c/enc/dictionary_hash.c \
@@ -61,6 +64,7 @@
c/enc/cluster.h \
c/enc/cluster_inc.h \
c/enc/command.h \
+ c/enc/compound_dictionary.h \
c/enc/compress_fragment.h \
c/enc/compress_fragment_two_pass.h \
c/enc/dictionary_hash.h \
@@ -96,4 +100,5 @@
c/include/brotli/decode.h \
c/include/brotli/encode.h \
c/include/brotli/port.h \
+ c/include/brotli/shared_dictionary.h \
c/include/brotli/types.h
diff --git a/setup.py b/setup.py
index 1491db3..e3e2844 100644
--- a/setup.py
+++ b/setup.py
@@ -183,6 +183,7 @@
'python/_brotli.cc',
'c/common/dictionary.c',
'c/common/transform.c',
+ 'c/common/shared_dictionary.c',
'c/dec/bit_reader.c',
'c/dec/decode.c',
'c/dec/huffman.c',
@@ -193,6 +194,7 @@
'c/enc/block_splitter.c',
'c/enc/brotli_bit_stream.c',
'c/enc/cluster.c',
+ 'c/enc/compound_dictionary.c',
'c/enc/compress_fragment.c',
'c/enc/compress_fragment_two_pass.c',
'c/enc/dictionary_hash.c',
@@ -211,6 +213,7 @@
'c/common/context.h',
'c/common/dictionary.h',
'c/common/platform.h',
+ 'c/common/shared_dictionary_internal.h',
'c/common/transform.h',
'c/common/version.h',
'c/dec/bit_reader.h',
@@ -229,6 +232,7 @@
'c/enc/cluster.h',
'c/enc/cluster_inc.h',
'c/enc/command.h',
+ 'c/enc/compound_dictionary.h',
'c/enc/compress_fragment.h',
'c/enc/compress_fragment_two_pass.h',
'c/enc/dictionary_hash.h',
