docs/encode.h.3

.TH "encode.h" 3 "Fri Mar 2 2018" "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 \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 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 (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"
.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 \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 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 \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 ::BROTLI_MAX_NPOSTFIX\&. 
.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)\&. 
.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\&.
.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 (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
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 BROTL_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_VERSION for more information\&. 
.SH "Author"
.PP 
Generated automatically by Doxygen for Brotli from the source code\&.