.TH "encode.h" 3 "August 2021" "Brotli" \" -*- nroff -*-
.ad l
.nh
.SH NAME
encode.h \- API for Brotli compression\&.  

.SH SYNOPSIS
.br
.PP
.SS "Macros"

.in +1c
.ti -1c
.RI "#define \fBBROTLI_DEFAULT_MODE\fP   \fBBROTLI_MODE_GENERIC\fP"
.br
.RI "\fIDefault value for \fBBROTLI_PARAM_MODE\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_DEFAULT_QUALITY\fP   11"
.br
.RI "\fIDefault value for \fBBROTLI_PARAM_QUALITY\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_DEFAULT_WINDOW\fP   22"
.br
.RI "\fIDefault value for \fBBROTLI_PARAM_LGWIN\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_LARGE_MAX_WINDOW_BITS\fP   30"
.br
.RI "\fIMaximal value for \fBBROTLI_PARAM_LGWIN\fP parameter in 'Large Window Brotli' (32-bit)\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_MAX_INPUT_BLOCK_BITS\fP   24"
.br
.RI "\fIMaximal value for \fBBROTLI_PARAM_LGBLOCK\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_MAX_QUALITY\fP   11"
.br
.RI "\fIMaximal value for \fBBROTLI_PARAM_QUALITY\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_MAX_WINDOW_BITS\fP   24"
.br
.RI "\fIMaximal value for \fBBROTLI_PARAM_LGWIN\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_MIN_INPUT_BLOCK_BITS\fP   16"
.br
.RI "\fIMinimal value for \fBBROTLI_PARAM_LGBLOCK\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_MIN_QUALITY\fP   0"
.br
.RI "\fIMinimal value for \fBBROTLI_PARAM_QUALITY\fP parameter\&. \fP"
.ti -1c
.RI "#define \fBBROTLI_MIN_WINDOW_BITS\fP   10"
.br
.RI "\fIMinimal value for \fBBROTLI_PARAM_LGWIN\fP parameter\&. \fP"
.in -1c
.SS "Typedefs"

.in +1c
.ti -1c
.RI "typedef enum \fBBrotliEncoderBase64Mode\fP \fBBrotliEncoderBase64Mode\fP"
.br
.RI "\fIOptions for \fBBROTLI_PARAM_BASE64_MODE\fP parameter\&. \fP"
.ti -1c
.RI "typedef enum \fBBrotliEncoderMode\fP \fBBrotliEncoderMode\fP"
.br
.RI "\fIOptions for \fBBROTLI_PARAM_MODE\fP parameter\&. \fP"
.ti -1c
.RI "typedef enum \fBBrotliEncoderOperation\fP \fBBrotliEncoderOperation\fP"
.br
.RI "\fIOperations that can be performed by streaming encoder\&. \fP"
.ti -1c
.RI "typedef enum \fBBrotliEncoderParameter\fP \fBBrotliEncoderParameter\fP"
.br
.RI "\fIOptions to be used with \fBBrotliEncoderSetParameter\fP\&. \fP"
.ti -1c
.RI "typedef enum \fBBrotliEncoderSimdHasher\fP \fBBrotliEncoderSimdHasher\fP"
.br
.RI "\fIOptions for \fBBROTLI_PARAM_SIMD_HASHER\fP parameter\&. \fP"
.ti -1c
.RI "typedef struct BrotliEncoderStateStruct \fBBrotliEncoderState\fP"
.br
.RI "\fIOpaque structure that holds encoder state\&. \fP"
.in -1c
.SS "Enumerations"
.SS "Functions"

.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"
.ti -1c
.RI "\fBBROTLI_BOOL\fP \fBBrotliEncoderCompressStream\fP (\fBBrotliEncoderState\fP *state, \fBBrotliEncoderOperation\fP op, size_t *available_in, const uint8_t **next_in, size_t *available_out, uint8_t **next_out, size_t *total_out)"
.br
.RI "\fICompresses input stream to output stream\&. \fP"
.ti -1c
.RI "\fBBrotliEncoderState\fP * \fBBrotliEncoderCreateInstance\fP (\fBbrotli_alloc_func\fP alloc_func, \fBbrotli_free_func\fP free_func, void *opaque)"
.br
.RI "\fICreates an instance of \fBBrotliEncoderState\fP and initializes it\&. \fP"
.ti -1c
.RI "void \fBBrotliEncoderDestroyInstance\fP (\fBBrotliEncoderState\fP *state)"
.br
.RI "\fIDeinitializes and frees \fBBrotliEncoderState\fP instance\&. \fP"
.ti -1c
.RI "\fBBROTLI_BOOL\fP \fBBrotliEncoderHasMoreOutput\fP (\fBBrotliEncoderState\fP *state)"
.br
.RI "\fIChecks if encoder has more output\&. \fP"
.ti -1c
.RI "\fBBROTLI_BOOL\fP \fBBrotliEncoderIsFinished\fP (\fBBrotliEncoderState\fP *state)"
.br
.RI "\fIChecks if encoder instance reached the final state\&. \fP"
.ti -1c
.RI "size_t \fBBrotliEncoderMaxCompressedSize\fP (size_t input_size)"
.br
.RI "\fICalculates the output size bound for the given \fCinput_size\fP\&. \fP"
.ti -1c
.RI "BrotliEncoderPreparedDictionary * \fBBrotliEncoderPrepareDictionary\fP (BrotliSharedDictionaryType type, size_t data_size, const uint8_t data[data_size], 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"
.ti -1c
.RI "const uint8_t * \fBBrotliEncoderTakeOutput\fP (\fBBrotliEncoderState\fP *state, size_t *size)"
.br
.RI "\fIAcquires pointer to internal output buffer\&. \fP"
.ti -1c
.RI "uint32_t \fBBrotliEncoderVersion\fP (void)"
.br
.RI "\fIGets an encoder library version\&. \fP"
.in -1c
.SH "Detailed Description"
.PP 
API for Brotli compression\&. 


.SH "Macro Definition Documentation"
.PP 
.SS "#define BROTLI_DEFAULT_MODE   \fBBROTLI_MODE_GENERIC\fP"

.PP
Default value for \fBBROTLI_PARAM_MODE\fP parameter\&. 
.SS "#define BROTLI_DEFAULT_QUALITY   11"

.PP
Default value for \fBBROTLI_PARAM_QUALITY\fP parameter\&. 
.SS "#define BROTLI_DEFAULT_WINDOW   22"

.PP
Default value for \fBBROTLI_PARAM_LGWIN\fP parameter\&. 
.SS "#define BROTLI_MAX_INPUT_BLOCK_BITS   24"

.PP
Maximal value for \fBBROTLI_PARAM_LGBLOCK\fP parameter\&. 
.SS "#define BROTLI_MAX_QUALITY   11"

.PP
Maximal value for \fBBROTLI_PARAM_QUALITY\fP parameter\&. 
.SS "#define BROTLI_MAX_WINDOW_BITS   24"

.PP
Maximal value for \fBBROTLI_PARAM_LGWIN\fP parameter\&. 
.PP
\fBNote:\fP
.RS 4
equal to \fCBROTLI_MAX_DISTANCE_BITS\fP constant\&. 
.RE
.PP

.SS "#define BROTLI_MIN_INPUT_BLOCK_BITS   16"

.PP
Minimal value for \fBBROTLI_PARAM_LGBLOCK\fP parameter\&. 
.SS "#define BROTLI_MIN_QUALITY   0"

.PP
Minimal value for \fBBROTLI_PARAM_QUALITY\fP parameter\&. 
.SS "#define BROTLI_MIN_WINDOW_BITS   10"

.PP
Minimal value for \fBBROTLI_PARAM_LGWIN\fP parameter\&. 
.SH "Typedef Documentation"
.PP 
.SS "typedef enum \fBBrotliEncoderBase64Mode\fP  \fBBrotliEncoderBase64Mode\fP"

.PP
Options for \fBBROTLI_PARAM_BASE64_MODE\fP parameter\&. 
.SS "typedef enum \fBBrotliEncoderMode\fP  \fBBrotliEncoderMode\fP"

.PP
Options for \fBBROTLI_PARAM_MODE\fP parameter\&. 
.SS "typedef enum \fBBrotliEncoderOperation\fP  \fBBrotliEncoderOperation\fP"

.PP
Operations that can be performed by streaming encoder\&. 
.SS "typedef enum \fBBrotliEncoderParameter\fP  \fBBrotliEncoderParameter\fP"

.PP
Options to be used with \fBBrotliEncoderSetParameter\fP\&. 
.SS "typedef enum \fBBrotliEncoderSimdHasher\fP  \fBBrotliEncoderSimdHasher\fP"

.PP
Options for \fBBROTLI_PARAM_SIMD_HASHER\fP parameter\&. 
.SS "typedef struct BrotliEncoderStateStruct \fBBrotliEncoderState\fP"

.PP
Opaque structure that holds encoder state\&. Allocated and initialized with \fBBrotliEncoderCreateInstance\fP\&. Cleaned up and deallocated with \fBBrotliEncoderDestroyInstance\fP\&. 
.SH "Enumeration Type Documentation"
.PP 
.SS "enum \fBBrotliEncoderBase64Mode\fP"

.PP
Options for \fBBROTLI_PARAM_BASE64_MODE\fP parameter\&. 
.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fIBROTLI_BASE64_MODE_DISABLED \fP\fP
Base64 optimization is disabled\&. 
.TP
\fB\fIBROTLI_BASE64_MODE_DETECTION \fP\fP
Automatic detection of Base64 zones and direct jump (skipping dictionary and LZ77 lookups)\&. 
.SS "enum \fBBrotliEncoderMode\fP"

.PP
Options for \fBBROTLI_PARAM_MODE\fP parameter\&. 
.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fIBROTLI_MODE_GENERIC \fP\fP
Default compression mode\&. In this mode compressor does not know anything in advance about the properties of the input\&. 
.TP
\fB\fIBROTLI_MODE_TEXT \fP\fP
Compression mode for UTF-8 formatted text input\&. 
.TP
\fB\fIBROTLI_MODE_FONT \fP\fP
Compression mode used in WOFF 2\&.0\&. 
.SS "enum \fBBrotliEncoderOperation\fP"

.PP
Operations that can be performed by streaming encoder\&. 
.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fIBROTLI_OPERATION_PROCESS \fP\fP
Process input\&. Encoder may postpone producing output, until it has processed enough input\&. 
.TP
\fB\fIBROTLI_OPERATION_FLUSH \fP\fP
Produce output for all processed input\&. Actual flush is performed when input stream is depleted and there is enough space in output stream\&. This means that client should repeat \fBBROTLI_OPERATION_FLUSH\fP operation until \fCavailable_in\fP becomes \fC0\fP, and \fBBrotliEncoderHasMoreOutput\fP returns \fBBROTLI_FALSE\fP\&. If output is acquired via \fBBrotliEncoderTakeOutput\fP, then operation should be repeated after output buffer is drained\&.
.PP
\fBWarning:\fP
.RS 4
Until flush is complete, client \fBSHOULD\fP \fBNOT\fP swap, reduce or extend input stream\&.
.RE
.PP
When flush is complete, output data will be sufficient for decoder to reproduce all the given input\&. 
.TP
\fB\fIBROTLI_OPERATION_FINISH \fP\fP
Finalize the stream\&. Actual finalization is performed when input stream is depleted and there is enough space in output stream\&. This means that client should repeat \fBBROTLI_OPERATION_FINISH\fP operation until \fCavailable_in\fP becomes \fC0\fP, and \fBBrotliEncoderHasMoreOutput\fP returns \fBBROTLI_FALSE\fP\&. If output is acquired via \fBBrotliEncoderTakeOutput\fP, then operation should be repeated after output buffer is drained\&.
.PP
\fBWarning:\fP
.RS 4
Until finalization is complete, client \fBSHOULD\fP \fBNOT\fP swap, reduce or extend input stream\&.
.RE
.PP
Helper function \fBBrotliEncoderIsFinished\fP checks if stream is finalized and output fully dumped\&.
.PP
Adding more input data to finalized stream is impossible\&. 
.TP
\fB\fIBROTLI_OPERATION_EMIT_METADATA \fP\fP
Emit metadata block to stream\&. Metadata is opaque to Brotli: neither encoder, nor decoder processes this data or relies on it\&. It may be used to pass some extra information from encoder client to decoder client without interfering with main data stream\&.
.PP
\fBNote:\fP
.RS 4
Encoder may emit empty metadata blocks internally, to pad encoded stream to byte boundary\&.
.RE
.PP
\fBWarning:\fP
.RS 4
Until emitting metadata is complete client \fBSHOULD\fP \fBNOT\fP swap, reduce or extend input stream\&.
.PP
The whole content of input buffer is considered to be the content of metadata block\&. Do \fBNOT\fP \fIappend\fP metadata to input stream, before it is depleted with other operations\&.
.RE
.PP
Stream is soft-flushed before metadata block is emitted\&. Metadata block \fBMUST\fP be no longer than than 16MiB\&. 
.SS "enum \fBBrotliEncoderParameter\fP"

.PP
Options to be used with \fBBrotliEncoderSetParameter\fP\&. 
.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fIBROTLI_PARAM_MODE \fP\fP
Tune encoder for specific input\&. \fBBrotliEncoderMode\fP enumerates all available values\&. 
.TP
\fB\fIBROTLI_PARAM_QUALITY \fP\fP
The main compression speed-density lever\&. The higher the quality, the slower the compression\&. Range is from \fBBROTLI_MIN_QUALITY\fP to \fBBROTLI_MAX_QUALITY\fP\&. 
.TP
\fB\fIBROTLI_PARAM_LGWIN \fP\fP
Recommended sliding LZ77 window size\&. Encoder may reduce this value, e\&.g\&. if input is much smaller than window size\&.
.PP
Window size is \fC(1 << value) - 16\fP\&.
.PP
Range is from \fBBROTLI_MIN_WINDOW_BITS\fP to \fBBROTLI_MAX_WINDOW_BITS\fP\&. 
.TP
\fB\fIBROTLI_PARAM_LGBLOCK \fP\fP
Recommended input block size\&. Encoder may reduce this value, e\&.g\&. if input is much smaller than input block size\&.
.PP
Range is from \fBBROTLI_MIN_INPUT_BLOCK_BITS\fP to \fBBROTLI_MAX_INPUT_BLOCK_BITS\fP\&.
.PP
\fBNote:\fP
.RS 4
Bigger input block size allows better compression, but consumes more memory\&. 
.br
 The rough formula of memory used for temporary input storage is \fC3 << lgBlock\fP\&. 
.RE
.PP

.TP
\fB\fIBROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING \fP\fP
Flag that affects usage of 'literal context modeling' format feature\&. This flag is a 'decoding-speed vs compression ratio' trade-off\&. 
.TP
\fB\fIBROTLI_PARAM_SIZE_HINT \fP\fP
Estimated total input size for all \fBBrotliEncoderCompressStream\fP calls\&. The default value is 0, which means that the total input size is unknown\&. 
.TP
\fB\fIBROTLI_PARAM_LARGE_WINDOW \fP\fP
Flag that determines if 'Large Window Brotli' is used\&. 
.TP
\fB\fIBROTLI_PARAM_NPOSTFIX \fP\fP
Recommended number of postfix bits (NPOSTFIX)\&. Encoder may change this value\&.
.PP
Range is from 0 to \fBBROTLI_MAX_NPOSTFIX\fP\&. 
.TP
\fB\fIBROTLI_PARAM_NDIRECT \fP\fP
Recommended number of direct distance codes (NDIRECT)\&. Encoder may change this value\&.
.PP
Range is from 0 to (15 << NPOSTFIX) in steps of (1 << NPOSTFIX)\&. 
.TP
\fB\fIBROTLI_PARAM_STREAM_OFFSET \fP\fP
Number of bytes of input stream already processed by a different instance\&. 
.PP
\fBNote:\fP
.RS 4
It is important to configure all the encoder instances with same parameters (except this one) in order to allow all the encoded parts obey the same restrictions implied by header\&.
.RE
.PP
If offset is not 0, then stream header is omitted\&. In any case output start is byte aligned, so for proper streams stitching 'predecessor' stream must be flushed\&.
.PP
Range is not artificially limited, but all the values greater or equal to maximal window size have the same effect\&. Values greater than 2**30 are not allowed\&. 
.TP
\fB\fIBROTLI_PARAM_BASE64_MODE \fP\fP
Base64 encoding mode\&. Controls how the encoder handles Base64 content\&. Currently supports 0 (disabled) and 1 (automatic detection and skip dictionary lookups)\&. 
.TP
\fB\fIBROTLI_PARAM_MAX_BASE64_REGIONS \fP\fP
Maximum number of Base64 regions to detect\&. Default is 16\&. 
.TP
\fB\fIBROTLI_PARAM_SIMD_HASHER \fP\fP
SIMD hasher usage mode\&. Controls whether the encoder uses SIMD hashers\&. See \fBBrotliEncoderSimdHasher\fP for options\&. 
.TP
\fB\fIBROTLI_PARAM_HASHER_OPT \fP\fP
Engage optimized hasher\&. When enabled (1), engages H59 instead of H58\&. 
.SS "enum \fBBrotliEncoderSimdHasher\fP"

.PP
Options for \fBBROTLI_PARAM_SIMD_HASHER\fP parameter\&. 
.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fIBROTLI_SIMD_HASHER_DEFAULT \fP\fP
Use SIMD hasher when recommended for the quality level\&. 
.TP
\fB\fIBROTLI_SIMD_HASHER_ENABLE \fP\fP
Use SIMD hasher when supported up to quality 7\&. 
.TP
\fB\fIBROTLI_SIMD_HASHER_DISABLE \fP\fP
Never use SIMD hasher\&. 
.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
Performs one-shot memory-to-memory compression\&. Compresses the data in \fCinput_buffer\fP into \fCencoded_buffer\fP, and sets \fC*encoded_size\fP to the compressed length\&.
.PP
\fBNote:\fP
.RS 4
If \fBBrotliEncoderMaxCompressedSize\fP(\fCinput_size\fP) returns non-zero value, then output is guaranteed to be no longer than that\&.
.PP
If \fClgwin\fP is greater than \fBBROTLI_MAX_WINDOW_BITS\fP then resulting stream might be incompatible with RFC 7932; to decode such streams, decoder should be configured with \fBBROTLI_DECODER_PARAM_LARGE_WINDOW\fP = \fC1\fP 
.RE
.PP
\fBParameters:\fP
.RS 4
\fIquality\fP quality parameter value, e\&.g\&. \fBBROTLI_DEFAULT_QUALITY\fP 
.br
\fIlgwin\fP lgwin parameter value, e\&.g\&. \fBBROTLI_DEFAULT_WINDOW\fP 
.br
\fImode\fP mode parameter value, e\&.g\&. \fBBROTLI_DEFAULT_MODE\fP 
.br
\fIinput_size\fP size of \fCinput_buffer\fP 
.br
\fIinput_buffer\fP input data buffer with at least \fCinput_size\fP addressable bytes 
.br
\fIencoded_size\fP \fBin:\fP size of \fCencoded_buffer\fP; 
.br
 \fBout:\fP length of compressed data written to \fCencoded_buffer\fP, or \fC0\fP if compression fails 
.br
\fIencoded_buffer\fP compressed data destination buffer 
.RE
.PP
\fBReturns:\fP
.RS 4
\fBBROTLI_FALSE\fP in case of compression error 
.PP
\fBBROTLI_FALSE\fP if output buffer is too small 
.PP
\fBBROTLI_TRUE\fP otherwise 
.RE
.PP

.SS "\fBBROTLI_BOOL\fP BrotliEncoderCompressStream (\fBBrotliEncoderState\fP * state, \fBBrotliEncoderOperation\fP op, size_t * available_in, const uint8_t ** next_in, size_t * available_out, uint8_t ** next_out, size_t * total_out)"

.PP
Compresses input stream to output stream\&. The values \fC*available_in\fP and \fC*available_out\fP must specify the number of bytes addressable at \fC*next_in\fP and \fC*next_out\fP respectively\&. When \fC*available_out\fP is \fC0\fP, \fCnext_out\fP is allowed to be \fCNULL\fP\&.
.PP
After each call, \fC*available_in\fP will be decremented by the amount of input bytes consumed, and the \fC*next_in\fP pointer will be incremented by that amount\&. Similarly, \fC*available_out\fP will be decremented by the amount of output bytes written, and the \fC*next_out\fP pointer will be incremented by that amount\&.
.PP
\fCtotal_out\fP, if it is not a null-pointer, will be set to the number of bytes compressed since the last \fCstate\fP initialization\&.
.PP
Internally workflow consists of 3 tasks:
.IP "1." 4
(optionally) copy input data to internal buffer
.IP "2." 4
actually compress data and (optionally) store it to internal buffer
.IP "3." 4
(optionally) copy compressed bytes from internal buffer to output stream
.PP
.PP
Whenever all 3 tasks can't move forward anymore, or error occurs, this method returns the control flow to caller\&.
.PP
\fCop\fP is used to perform flush, finish the stream, or inject metadata block\&. See \fBBrotliEncoderOperation\fP for more information\&.
.PP
Flushing the stream means forcing encoding of all input passed to encoder and completing the current output block, so it could be fully decoded by stream decoder\&. To perform flush set \fCop\fP to \fBBROTLI_OPERATION_FLUSH\fP\&. Under some circumstances (e\&.g\&. lack of output stream capacity) this operation would require several calls to \fBBrotliEncoderCompressStream\fP\&. The method must be called again until both input stream is depleted and encoder has no more output (see \fBBrotliEncoderHasMoreOutput\fP) after the method is called\&.
.PP
Finishing the stream means encoding of all input passed to encoder and adding specific 'final' marks, so stream decoder could determine that stream is complete\&. To perform finish set \fCop\fP to \fBBROTLI_OPERATION_FINISH\fP\&. Under some circumstances (e\&.g\&. lack of output stream capacity) this operation would require several calls to \fBBrotliEncoderCompressStream\fP\&. The method must be called again until both input stream is depleted and encoder has no more output (see \fBBrotliEncoderHasMoreOutput\fP) after the method is called\&.
.PP
\fBWarning:\fP
.RS 4
When flushing and finishing, \fCop\fP should not change until operation is complete; input stream should not be swapped, reduced or extended as well\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fIstate\fP encoder instance 
.br
\fIop\fP requested operation 
.br
\fIavailable_in\fP \fBin:\fP amount of available input; 
.br
 \fBout:\fP amount of unused input 
.br
\fInext_in\fP pointer to the next input byte 
.br
\fIavailable_out\fP \fBin:\fP length of output buffer; 
.br
 \fBout:\fP remaining size of output buffer 
.br
\fInext_out\fP compressed output buffer cursor; can be \fCNULL\fP if \fCavailable_out\fP is \fC0\fP 
.br
\fItotal_out\fP number of bytes produced so far; can be \fCNULL\fP 
.RE
.PP
\fBReturns:\fP
.RS 4
\fBBROTLI_FALSE\fP if there was an error 
.PP
\fBBROTLI_TRUE\fP otherwise 
.RE
.PP

.SS "\fBBrotliEncoderState\fP* BrotliEncoderCreateInstance (\fBbrotli_alloc_func\fP alloc_func, \fBbrotli_free_func\fP free_func, void * opaque)"

.PP
Creates an instance of \fBBrotliEncoderState\fP and initializes it\&. \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
\fIalloc_func\fP custom memory allocation function 
.br
\fIfree_func\fP custom memory free function 
.br
\fIopaque\fP custom memory manager handle 
.RE
.PP
\fBReturns:\fP
.RS 4
\fC0\fP if instance can not be allocated or initialized 
.PP
pointer to initialized \fBBrotliEncoderState\fP otherwise 
.RE
.PP

.SS "void BrotliEncoderDestroyInstance (\fBBrotliEncoderState\fP * state)"

.PP
Deinitializes and frees \fBBrotliEncoderState\fP instance\&. 
.PP
\fBParameters:\fP
.RS 4
\fIstate\fP decoder instance to be cleaned up and deallocated 
.RE
.PP

.SS "\fBBROTLI_BOOL\fP BrotliEncoderHasMoreOutput (\fBBrotliEncoderState\fP * state)"

.PP
Checks if encoder has more output\&. 
.PP
\fBParameters:\fP
.RS 4
\fIstate\fP encoder instance 
.RE
.PP
\fBReturns:\fP
.RS 4
\fBBROTLI_TRUE\fP, if encoder has some unconsumed output 
.PP
\fBBROTLI_FALSE\fP otherwise 
.RE
.PP

.SS "\fBBROTLI_BOOL\fP BrotliEncoderIsFinished (\fBBrotliEncoderState\fP * state)"

.PP
Checks if encoder instance reached the final state\&. 
.PP
\fBParameters:\fP
.RS 4
\fIstate\fP encoder instance 
.RE
.PP
\fBReturns:\fP
.RS 4
\fBBROTLI_TRUE\fP if encoder is in a state where it reached the end of the input and produced all of the output 
.PP
\fBBROTLI_FALSE\fP otherwise 
.RE
.PP

.SS "size_t BrotliEncoderMaxCompressedSize (size_t input_size)"

.PP
Calculates the output size bound for the given \fCinput_size\fP\&. 
.PP
\fBWarning:\fP
.RS 4
Result is only valid if quality is at least \fC2\fP and, in case \fBBrotliEncoderCompressStream\fP was used, no flushes (\fBBROTLI_OPERATION_FLUSH\fP) were performed\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fIinput_size\fP size of projected input 
.RE
.PP
\fBReturns:\fP
.RS 4
\fC0\fP if result does not fit \fCsize_t\fP 
.RE
.PP

.SS "BrotliEncoderPreparedDictionary* BrotliEncoderPrepareDictionary (BrotliSharedDictionaryType type, size_t data_size, const uint8_t data[data_size], 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
\fBWarning:\fP
.RS 4
Created instance is 'lean'; it does not contain copy of \fCdata\fP, rather it contains only pointer to it; therefore, \fCdata\fP \fBMUST\fP outlive the created instance\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fItype\fP type of dictionary stored in data 
.br
\fIdata_size\fP size of \fCdata\fP buffer 
.br
\fIdata\fP pointer to the dictionary 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
Sets the specified parameter to the given encoder instance\&. 
.PP
\fBParameters:\fP
.RS 4
\fIstate\fP encoder instance 
.br
\fIparam\fP parameter to set 
.br
\fIvalue\fP new parameter value 
.RE
.PP
\fBReturns:\fP
.RS 4
\fBBROTLI_FALSE\fP if parameter is unrecognized, or value is invalid 
.PP
\fBBROTLI_FALSE\fP if value of parameter can not be changed at current encoder state (e\&.g\&. when encoding is started, window size might be already encoded and therefore it is impossible to change it) 
.PP
\fBBROTLI_TRUE\fP if value is accepted 
.RE
.PP
\fBWarning:\fP
.RS 4
invalid values might be accepted in case they would not break encoding process\&. 
.RE
.PP

.SS "const uint8_t* BrotliEncoderTakeOutput (\fBBrotliEncoderState\fP * state, size_t * size)"

.PP
Acquires pointer to internal output buffer\&. This method is used to make language bindings easier and more efficient:
.IP "1." 4
push data to \fBBrotliEncoderCompressStream\fP, until \fBBrotliEncoderHasMoreOutput\fP returns BROTLI_TRUE
.IP "2." 4
use \fBBrotliEncoderTakeOutput\fP to peek bytes and copy to language-specific entity
.PP
.PP
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)\&.
.PP
\fBAttention:\fP
.RS 4
After every call to \fBBrotliEncoderTakeOutput\fP \fC*size\fP bytes of output are considered consumed for all consecutive calls to the instance methods; returned pointer becomes invalidated as well\&.
.RE
.PP
\fBNote:\fP
.RS 4
Encoder output is not guaranteed to be contiguous\&. This means that after the size-unrestricted call to \fBBrotliEncoderTakeOutput\fP, immediate next call to \fBBrotliEncoderTakeOutput\fP may return more data\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fIstate\fP encoder instance 
.br
\fIsize\fP \fBin:\fP number of bytes caller is ready to take, \fC0\fP if any amount could be handled; 
.br
 \fBout:\fP amount of data pointed by returned pointer and considered consumed; 
.br
 out value is never greater than in value, unless it is \fC0\fP 
.RE
.PP
\fBReturns:\fP
.RS 4
pointer to output data 
.RE
.PP

.SS "uint32_t BrotliEncoderVersion (void)"

.PP
Gets an encoder library version\&. Look at BROTLI_MAKE_HEX_VERSION for more information\&. 
.SH "Author"
.PP 
Generated automatically by Doxygen for Brotli from the source code\&.