| /* Copyright 2013 Google Inc. All Rights Reserved. |
| |
| Distributed under MIT license. |
| See file LICENSE for detail or copy at https://opensource.org/licenses/MIT |
| */ |
| |
| /** |
| * @file |
| * API for Brotli decompression. |
| */ |
| |
| #ifndef BROTLI_DEC_DECODE_H_ |
| #define BROTLI_DEC_DECODE_H_ |
| |
| #include <brotli/port.h> |
| #include <brotli/types.h> |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| extern "C" { |
| #endif |
| |
| /** |
| * Opaque structure that holds decoder state. |
| * |
| * Allocated and initialized with ::BrotliDecoderCreateInstance. |
| * Cleaned up and deallocated with ::BrotliDecoderDestroyInstance. |
| */ |
| typedef struct BrotliDecoderStateStruct BrotliDecoderState; |
| |
| /** |
| * Result type for ::BrotliDecoderDecompress and |
| * ::BrotliDecoderDecompressStream functions. |
| */ |
| typedef enum { |
| /** Decoding error, e.g. corrupted input or memory allocation problem. */ |
| BROTLI_DECODER_RESULT_ERROR = 0, |
| /** Decoding successfully completed. */ |
| BROTLI_DECODER_RESULT_SUCCESS = 1, |
| /** Partially done; should be called again with more input. */ |
| BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT = 2, |
| /** Partially done; should be called again with more output. */ |
| BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT = 3 |
| } BrotliDecoderResult; |
| |
| /** |
| * Template that evaluates items of ::BrotliDecoderErrorCode. |
| * |
| * Example: @code {.cpp} |
| * // Log Brotli error code. |
| * switch (brotliDecoderErrorCode) { |
| * #define CASE_(PREFIX, NAME, CODE) \ |
| * case BROTLI_DECODER ## PREFIX ## NAME: \ |
| * LOG(INFO) << "error code:" << #NAME; \ |
| * break; |
| * #define NEWLINE_ |
| * BROTLI_DECODER_ERROR_CODES_LIST(CASE_, NEWLINE_) |
| * #undef CASE_ |
| * #undef NEWLINE_ |
| * default: LOG(FATAL) << "unknown brotli error code"; |
| * } |
| * @endcode |
| */ |
| #define BROTLI_DECODER_ERROR_CODES_LIST(BROTLI_ERROR_CODE, SEPARATOR) \ |
| BROTLI_ERROR_CODE(_, NO_ERROR, 0) SEPARATOR \ |
| /* Same as BrotliDecoderResult values */ \ |
| BROTLI_ERROR_CODE(_, SUCCESS, 1) SEPARATOR \ |
| BROTLI_ERROR_CODE(_, NEEDS_MORE_INPUT, 2) SEPARATOR \ |
| BROTLI_ERROR_CODE(_, NEEDS_MORE_OUTPUT, 3) SEPARATOR \ |
| \ |
| /* Errors caused by invalid input */ \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, EXUBERANT_NIBBLE, -1) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, RESERVED, -2) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, EXUBERANT_META_NIBBLE, -3) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, SIMPLE_HUFFMAN_ALPHABET, -4) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, SIMPLE_HUFFMAN_SAME, -5) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, CL_SPACE, -6) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, HUFFMAN_SPACE, -7) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, CONTEXT_MAP_REPEAT, -8) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, BLOCK_LENGTH_1, -9) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, BLOCK_LENGTH_2, -10) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, TRANSFORM, -11) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, DICTIONARY, -12) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, WINDOW_BITS, -13) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, PADDING_1, -14) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, PADDING_2, -15) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_FORMAT_, DISTANCE, -16) SEPARATOR \ |
| \ |
| /* -17..-18 codes are reserved */ \ |
| \ |
| BROTLI_ERROR_CODE(_ERROR_, DICTIONARY_NOT_SET, -19) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_, INVALID_ARGUMENTS, -20) SEPARATOR \ |
| \ |
| /* Memory allocation problems */ \ |
| BROTLI_ERROR_CODE(_ERROR_ALLOC_, CONTEXT_MODES, -21) SEPARATOR \ |
| /* Literal, insert and distance trees together */ \ |
| BROTLI_ERROR_CODE(_ERROR_ALLOC_, TREE_GROUPS, -22) SEPARATOR \ |
| /* -23..-24 codes are reserved for distinct tree groups */ \ |
| BROTLI_ERROR_CODE(_ERROR_ALLOC_, CONTEXT_MAP, -25) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_ALLOC_, RING_BUFFER_1, -26) SEPARATOR \ |
| BROTLI_ERROR_CODE(_ERROR_ALLOC_, RING_BUFFER_2, -27) SEPARATOR \ |
| /* -28..-29 codes are reserved for dynamic ring-buffer allocation */ \ |
| BROTLI_ERROR_CODE(_ERROR_ALLOC_, BLOCK_TYPE_TREES, -30) SEPARATOR \ |
| \ |
| /* "Impossible" states */ \ |
| BROTLI_ERROR_CODE(_ERROR_, UNREACHABLE, -31) |
| |
| /** |
| * Error code for detailed logging / production debugging. |
| * |
| * See ::BrotliDecoderGetErrorCode and ::BROTLI_LAST_ERROR_CODE. |
| */ |
| typedef enum { |
| #define BROTLI_COMMA_ , |
| #define BROTLI_ERROR_CODE_ENUM_ITEM_(PREFIX, NAME, CODE) \ |
| BROTLI_DECODER ## PREFIX ## NAME = CODE |
| BROTLI_DECODER_ERROR_CODES_LIST(BROTLI_ERROR_CODE_ENUM_ITEM_, BROTLI_COMMA_) |
| } BrotliDecoderErrorCode; |
| #undef BROTLI_ERROR_CODE_ENUM_ITEM_ |
| #undef BROTLI_COMMA_ |
| |
| /** |
| * The value of the last error code, negative integer. |
| * |
| * All other error code values are in the range from ::BROTLI_LAST_ERROR_CODE |
| * to @c -1. There are also 4 other possible non-error codes @c 0 .. @c 3 in |
| * ::BrotliDecoderErrorCode enumeration. |
| */ |
| #define BROTLI_LAST_ERROR_CODE BROTLI_DECODER_ERROR_UNREACHABLE |
| |
| /** Options to be used with ::BrotliDecoderSetParameter. */ |
| typedef enum BrotliDecoderParameter { |
| /** |
| * Disable "canny" ring buffer allocation strategy. |
| * |
| * Ring buffer is allocated according to window size, despite the real size of |
| * the content. |
| */ |
| BROTLI_DECODER_PARAM_DISABLE_RING_BUFFER_REALLOCATION = 0, |
| /** |
| * Flag that determines if "Large Window Brotli" is used. |
| */ |
| BROTLI_DECODER_PARAM_LARGE_WINDOW = 1 |
| } BrotliDecoderParameter; |
| |
| /** |
| * Sets the specified parameter to the given decoder instance. |
| * |
| * @param state decoder instance |
| * @param param parameter to set |
| * @param value new parameter value |
| * @returns ::BROTLI_FALSE if parameter is unrecognized, or value is invalid |
| * @returns ::BROTLI_TRUE if value is accepted |
| */ |
| BROTLI_DEC_API BROTLI_BOOL BrotliDecoderSetParameter( |
| BrotliDecoderState* state, BrotliDecoderParameter param, uint32_t value); |
| |
| /** |
| * Creates an instance of ::BrotliDecoderState and initializes it. |
| * |
| * The instance can be used once for decoding and should then be destroyed with |
| * ::BrotliDecoderDestroyInstance, it cannot be reused for a new decoding |
| * session. |
| * |
| * @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_DEC_API BrotliDecoderState* BrotliDecoderCreateInstance( |
| brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque); |
| |
| /** |
| * Deinitializes and frees ::BrotliDecoderState instance. |
| * |
| * @param state decoder instance to be cleaned up and deallocated |
| */ |
| BROTLI_DEC_API void BrotliDecoderDestroyInstance(BrotliDecoderState* state); |
| |
| /** |
| * Performs one-shot memory-to-memory decompression. |
| * |
| * Decompresses the data in @p encoded_buffer into @p decoded_buffer, and sets |
| * @p *decoded_size to the decompressed length. |
| * |
| * @param encoded_size size of @p encoded_buffer |
| * @param encoded_buffer compressed data buffer with at least @p encoded_size |
| * addressable bytes |
| * @param[in, out] decoded_size @b in: size of @p decoded_buffer; \n |
| * @b out: length of decompressed data written to |
| * @p decoded_buffer |
| * @param decoded_buffer decompressed data destination buffer |
| * @returns ::BROTLI_DECODER_RESULT_ERROR if input is corrupted, memory |
| * allocation failed, or @p decoded_buffer is not large enough; |
| * @returns ::BROTLI_DECODER_RESULT_SUCCESS otherwise |
| */ |
| BROTLI_DEC_API BrotliDecoderResult BrotliDecoderDecompress( |
| size_t encoded_size, |
| const uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(encoded_size)], |
| size_t* decoded_size, |
| uint8_t decoded_buffer[BROTLI_ARRAY_PARAM(*decoded_size)]); |
| |
| /** |
| * Decompresses the input stream to the output stream. |
| * |
| * The values @p *available_in and @p *available_out must specify the number of |
| * bytes addressable at @p *next_in and @p *next_out respectively. |
| * When @p *available_out is @c 0, @p next_out is allowed to be @c NULL. |
| * |
| * After each call, @p *available_in will be decremented by the amount of input |
| * bytes consumed, and the @p *next_in pointer will be incremented by that |
| * amount. Similarly, @p *available_out will be decremented by the amount of |
| * output bytes written, and the @p *next_out pointer will be incremented by |
| * that amount. |
| * |
| * @p total_out, if it is not a null-pointer, will be set to the number |
| * of bytes decompressed since the last @p state initialization. |
| * |
| * @note Input is never overconsumed, so @p next_in and @p available_in could be |
| * passed to the next consumer after decoding is complete. |
| * |
| * @param state decoder instance |
| * @param[in, out] available_in @b in: amount of available input; \n |
| * @b out: amount of unused input |
| * @param[in, out] next_in pointer to the next compressed byte |
| * @param[in, out] available_out @b in: length of output buffer; \n |
| * @b out: remaining size of output buffer |
| * @param[in, out] next_out output buffer cursor; |
| * can be @c NULL if @p available_out is @c 0 |
| * @param[out] total_out number of bytes decompressed so far; can be @c NULL |
| * @returns ::BROTLI_DECODER_RESULT_ERROR if input is corrupted, memory |
| * allocation failed, arguments were invalid, etc.; |
| * use ::BrotliDecoderGetErrorCode to get detailed error code |
| * @returns ::BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT decoding is blocked until |
| * more input data is provided |
| * @returns ::BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT decoding is blocked until |
| * more output space is provided |
| * @returns ::BROTLI_DECODER_RESULT_SUCCESS decoding is finished, no more |
| * input might be consumed and no more output will be produced |
| */ |
| 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); |
| |
| /** |
| * Checks if decoder has more output. |
| * |
| * @param state decoder instance |
| * @returns ::BROTLI_TRUE, if decoder has some unconsumed output |
| * @returns ::BROTLI_FALSE otherwise |
| */ |
| BROTLI_DEC_API BROTLI_BOOL BrotliDecoderHasMoreOutput( |
| const BrotliDecoderState* state); |
| |
| /** |
| * Acquires pointer to internal output buffer. |
| * |
| * This method is used to make language bindings easier and more efficient: |
| * -# push data to ::BrotliDecoderDecompressStream, |
| * until ::BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT is reported |
| * -# use ::BrotliDecoderTakeOutput to peek bytes and copy to language-specific |
| * entity |
| * |
| * Also this could be useful if there is an output stream that is able to |
| * consume all the provided data (e.g. when data is saved to file system). |
| * |
| * @attention After every call to ::BrotliDecoderTakeOutput @p *size bytes of |
| * output are considered consumed for all consecutive calls to the |
| * instance methods; returned pointer becomes invalidated as well. |
| * |
| * @note Decoder output is not guaranteed to be contiguous. This means that |
| * after the size-unrestricted call to ::BrotliDecoderTakeOutput, |
| * immediate next call to ::BrotliDecoderTakeOutput may return more data. |
| * |
| * @param state decoder instance |
| * @param[in, out] size @b in: number of bytes caller is ready to take, @c 0 if |
| * any amount could be handled; \n |
| * @b out: amount of data pointed by returned pointer and |
| * considered consumed; \n |
| * out value is never greater than in value, unless it is @c 0 |
| * @returns pointer to output data |
| */ |
| BROTLI_DEC_API const uint8_t* BrotliDecoderTakeOutput( |
| BrotliDecoderState* state, size_t* size); |
| |
| /** |
| * Checks if instance has already consumed input. |
| * |
| * Instance that returns ::BROTLI_FALSE is considered "fresh" and could be |
| * reused. |
| * |
| * @param state decoder instance |
| * @returns ::BROTLI_TRUE if decoder has already used some input bytes |
| * @returns ::BROTLI_FALSE otherwise |
| */ |
| BROTLI_DEC_API BROTLI_BOOL BrotliDecoderIsUsed(const BrotliDecoderState* state); |
| |
| /** |
| * Checks if decoder instance reached the final state. |
| * |
| * @param state decoder instance |
| * @returns ::BROTLI_TRUE if decoder is in a state where it reached the end of |
| * the input and produced all of the output |
| * @returns ::BROTLI_FALSE otherwise |
| */ |
| BROTLI_DEC_API BROTLI_BOOL BrotliDecoderIsFinished( |
| const BrotliDecoderState* state); |
| |
| /** |
| * Acquires a detailed error code. |
| * |
| * Should be used only after ::BrotliDecoderDecompressStream returns |
| * ::BROTLI_DECODER_RESULT_ERROR. |
| * |
| * See also ::BrotliDecoderErrorString |
| * |
| * @param state decoder instance |
| * @returns last saved error code |
| */ |
| BROTLI_DEC_API BrotliDecoderErrorCode BrotliDecoderGetErrorCode( |
| const BrotliDecoderState* state); |
| |
| /** |
| * Converts error code to a c-string. |
| */ |
| BROTLI_DEC_API const char* BrotliDecoderErrorString(BrotliDecoderErrorCode c); |
| |
| /** |
| * Gets a decoder library version. |
| * |
| * Look at BROTLI_VERSION for more information. |
| */ |
| BROTLI_DEC_API uint32_t BrotliDecoderVersion(void); |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| } /* extern "C" */ |
| #endif |
| |
| #endif /* BROTLI_DEC_DECODE_H_ */ |
