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/* 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 compression. */ #ifndef BROTLI_ENC_ENCODE_H_ #define BROTLI_ENC_ENCODE_H_ #include <brotli/port.h> #include <brotli/types.h> #if defined(__cplusplus) || defined(c_plusplus) extern "C" { #endif /** Minimal value for ::BROTLI_PARAM_LGWIN parameter. */ #define BROTLI_MIN_WINDOW_BITS 10 /** * Maximal value for ::BROTLI_PARAM_LGWIN parameter. * * @note equal to @c BROTLI_MAX_DISTANCE_BITS constant. */ #define BROTLI_MAX_WINDOW_BITS 24 /** * Maximal value for ::BROTLI_PARAM_LGWIN parameter * in "Large Window Brotli" (32-bit). */ #define BROTLI_LARGE_MAX_WINDOW_BITS 30 /** Minimal value for ::BROTLI_PARAM_LGBLOCK parameter. */ #define BROTLI_MIN_INPUT_BLOCK_BITS 16 /** Maximal value for ::BROTLI_PARAM_LGBLOCK parameter. */ #define BROTLI_MAX_INPUT_BLOCK_BITS 24 /** Minimal value for ::BROTLI_PARAM_QUALITY parameter. */ #define BROTLI_MIN_QUALITY 0 /** Maximal value for ::BROTLI_PARAM_QUALITY parameter. */ #define BROTLI_MAX_QUALITY 11 /** Options for ::BROTLI_PARAM_MODE parameter. */ typedef enum BrotliEncoderMode { /** * Default compression mode. * * In this mode compressor does not know anything in advance about the * properties of the input. */ BROTLI_MODE_GENERIC = 0, /** Compression mode for UTF-8 formatted text input. */ BROTLI_MODE_TEXT = 1, /** Compression mode used in WOFF 2.0. */ BROTLI_MODE_FONT = 2 } BrotliEncoderMode; /** Default value for ::BROTLI_PARAM_QUALITY parameter. */ #define BROTLI_DEFAULT_QUALITY 11 /** Default value for ::BROTLI_PARAM_LGWIN parameter. */ #define BROTLI_DEFAULT_WINDOW 22 /** Default value for ::BROTLI_PARAM_MODE parameter. */ #define BROTLI_DEFAULT_MODE BROTLI_MODE_GENERIC /** Operations that can be performed by streaming encoder. */ typedef enum BrotliEncoderOperation { /** * Process input. * * Encoder may postpone producing output, until it has processed enough input. */ BROTLI_OPERATION_PROCESS = 0, /** * 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 * ::BROTLI_OPERATION_FLUSH operation until @p available_in becomes @c 0, and * ::BrotliEncoderHasMoreOutput returns ::BROTLI_FALSE. If output is acquired * via ::BrotliEncoderTakeOutput, then operation should be repeated after * output buffer is drained. * * @warning Until flush is complete, client @b SHOULD @b NOT swap, * reduce or extend input stream. * * When flush is complete, output data will be sufficient for decoder to * reproduce all the given input. */ BROTLI_OPERATION_FLUSH = 1, /** * 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 * ::BROTLI_OPERATION_FINISH operation until @p available_in becomes @c 0, and * ::BrotliEncoderHasMoreOutput returns ::BROTLI_FALSE. If output is acquired * via ::BrotliEncoderTakeOutput, then operation should be repeated after * output buffer is drained. * * @warning Until finalization is complete, client @b SHOULD @b NOT swap, * reduce or extend input stream. * * Helper function ::BrotliEncoderIsFinished checks if stream is finalized and * output fully dumped. * * Adding more input data to finalized stream is impossible. */ BROTLI_OPERATION_FINISH = 2, /** * 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. * * @note Encoder may emit empty metadata blocks internally, to pad encoded * stream to byte boundary. * * @warning Until emitting metadata is complete client @b SHOULD @b NOT swap, * reduce or extend input stream. * * @warning The whole content of input buffer is considered to be the content * of metadata block. Do @b NOT @e append metadata to input stream, * before it is depleted with other operations. * * Stream is soft-flushed before metadata block is emitted. Metadata block * @b MUST be no longer than than 16MiB. */ BROTLI_OPERATION_EMIT_METADATA = 3 } BrotliEncoderOperation; /** Options to be used with ::BrotliEncoderSetParameter. */ typedef enum BrotliEncoderParameter { /** * Tune encoder for specific input. * * ::BrotliEncoderMode enumerates all available values. */ BROTLI_PARAM_MODE = 0, /** * The main compression speed-density lever. * * The higher the quality, the slower the compression. Range is * from ::BROTLI_MIN_QUALITY to ::BROTLI_MAX_QUALITY. */ BROTLI_PARAM_QUALITY = 1, /** * Recommended sliding LZ77 window size. * * Encoder may reduce this value, e.g. if input is much smaller than * window size. * * Window size is `(1 << value) - 16`. * * Range is from ::BROTLI_MIN_WINDOW_BITS to ::BROTLI_MAX_WINDOW_BITS. */ BROTLI_PARAM_LGWIN = 2, /** * Recommended input block size. * * Encoder may reduce this value, e.g. if input is much smaller than input * block size. * * Range is from ::BROTLI_MIN_INPUT_BLOCK_BITS to * ::BROTLI_MAX_INPUT_BLOCK_BITS. * * @note Bigger input block size allows better compression, but consumes more * memory. \n The rough formula of memory used for temporary input * storage is `3 << lgBlock`. */ BROTLI_PARAM_LGBLOCK = 3, /** * Flag that affects usage of "literal context modeling" format feature. * * This flag is a "decoding-speed vs compression ratio" trade-off. */ BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING = 4, /** * Estimated total input size for all ::BrotliEncoderCompressStream calls. * * The default value is 0, which means that the total input size is unknown. */ BROTLI_PARAM_SIZE_HINT = 5, /** * Flag that determines if "Large Window Brotli" is used. */ BROTLI_PARAM_LARGE_WINDOW = 6, /** * Recommended number of postfix bits (NPOSTFIX). * * Encoder may change this value. * * Range is from 0 to ::BROTLI_MAX_NPOSTFIX. */ BROTLI_PARAM_NPOSTFIX = 7, /** * Recommended number of direct distance codes (NDIRECT). * * Encoder may change this value. * * Range is from 0 to (15 << NPOSTFIX) in steps of (1 << NPOSTFIX). */ BROTLI_PARAM_NDIRECT = 8, /** * Number of bytes of input stream already processed by a different instance. * * @note 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. * * 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. * * 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. */ BROTLI_PARAM_STREAM_OFFSET = 9 } BrotliEncoderParameter; /** * Opaque structure that holds encoder state. * * Allocated and initialized with ::BrotliEncoderCreateInstance. * Cleaned up and deallocated with ::BrotliEncoderDestroyInstance. */ typedef struct BrotliEncoderStateStruct BrotliEncoderState; /** * Sets the specified parameter to the given encoder instance. * * @param state encoder instance * @param param parameter to set * @param value new parameter value * @returns ::BROTLI_FALSE if parameter is unrecognized, or value is invalid * @returns ::BROTLI_FALSE 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) * @returns ::BROTLI_TRUE if value is accepted * @warning invalid values might be accepted in case they would not break * encoding process. */ BROTLI_ENC_API BROTLI_BOOL BrotliEncoderSetParameter( BrotliEncoderState* state, BrotliEncoderParameter param, uint32_t value); /** * Creates an instance of ::BrotliEncoderState and initializes it. * * @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 ::BrotliEncoderState otherwise */ BROTLI_ENC_API BrotliEncoderState* BrotliEncoderCreateInstance( brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque); /** * Deinitializes and frees ::BrotliEncoderState instance. * * @param state decoder instance to be cleaned up and deallocated */ BROTLI_ENC_API void BrotliEncoderDestroyInstance(BrotliEncoderState* state); /** * Calculates the output size bound for the given @p input_size. * * @warning Result is only valid if quality is at least @c 2 and, in * case ::BrotliEncoderCompressStream was used, no flushes * (::BROTLI_OPERATION_FLUSH) were performed. * * @param input_size size of projected input * @returns @c 0 if result does not fit @c size_t */ BROTLI_ENC_API size_t BrotliEncoderMaxCompressedSize(size_t input_size); /** * Performs one-shot memory-to-memory compression. * * Compresses the data in @p input_buffer into @p encoded_buffer, and sets * @p *encoded_size to the compressed length. * * @note If ::BrotliEncoderMaxCompressedSize(@p input_size) returns non-zero * value, then output is guaranteed to be no longer than that. * * @note If @p lgwin is greater than ::BROTLI_MAX_WINDOW_BITS then resulting * stream might be incompatible with RFC 7932; to decode such streams, * decoder should be configured with * ::BROTLI_DECODER_PARAM_LARGE_WINDOW = @c 1 * * @param quality quality parameter value, e.g. ::BROTLI_DEFAULT_QUALITY * @param lgwin lgwin parameter value, e.g. ::BROTLI_DEFAULT_WINDOW * @param mode mode parameter value, e.g. ::BROTLI_DEFAULT_MODE * @param input_size size of @p input_buffer * @param input_buffer input data buffer with at least @p input_size * addressable bytes * @param[in, out] encoded_size @b in: size of @p encoded_buffer; \n * @b out: length of compressed data written to * @p encoded_buffer, or @c 0 if compression fails * @param encoded_buffer compressed data destination buffer * @returns ::BROTLI_FALSE in case of compression error * @returns ::BROTLI_FALSE if output buffer is too small * @returns ::BROTLI_TRUE otherwise */ BROTLI_ENC_API BROTLI_BOOL BrotliEncoderCompress( int quality, int lgwin, BrotliEncoderMode mode, size_t input_size, const uint8_t input_buffer[BROTLI_ARRAY_PARAM(input_size)], size_t* encoded_size, uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(*encoded_size)]); /** * Compresses input stream to 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 compressed since the last @p state initialization. * * * * Internally workflow consists of 3 tasks: * -# (optionally) copy input data to internal buffer * -# actually compress data and (optionally) store it to internal buffer * -# (optionally) copy compressed bytes from internal buffer to output stream * * Whenever all 3 tasks can't move forward anymore, or error occurs, this * method returns the control flow to caller. * * @p op is used to perform flush, finish the stream, or inject metadata block. * See ::BrotliEncoderOperation for more information. * * 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 @p op to ::BROTLI_OPERATION_FLUSH. * Under some circumstances (e.g. lack of output stream capacity) this operation * would require several calls to ::BrotliEncoderCompressStream. The method must * be called again until both input stream is depleted and encoder has no more * output (see ::BrotliEncoderHasMoreOutput) after the method is called. * * 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 @p op to ::BROTLI_OPERATION_FINISH. * Under some circumstances (e.g. lack of output stream capacity) this operation * would require several calls to ::BrotliEncoderCompressStream. The method must * be called again until both input stream is depleted and encoder has no more * output (see ::BrotliEncoderHasMoreOutput) after the method is called. * * @warning When flushing and finishing, @p op should not change until operation * is complete; input stream should not be swapped, reduced or * extended as well. * * @param state encoder instance * @param op requested operation * @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 input 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 compressed output buffer cursor; * can be @c NULL if @p available_out is @c 0 * @param[out] total_out number of bytes produced so far; can be @c NULL * @returns ::BROTLI_FALSE if there was an error * @returns ::BROTLI_TRUE otherwise */ BROTLI_ENC_API BROTLI_BOOL BrotliEncoderCompressStream( BrotliEncoderState* state, BrotliEncoderOperation op, size_t* available_in, const uint8_t** next_in, size_t* available_out, uint8_t** next_out, size_t* total_out); /** * Checks if encoder instance reached the final state. * * @param state encoder instance * @returns ::BROTLI_TRUE if encoder is in a state where it reached the end of * the input and produced all of the output * @returns ::BROTLI_FALSE otherwise */ BROTLI_ENC_API BROTLI_BOOL BrotliEncoderIsFinished(BrotliEncoderState* state); /** * Checks if encoder has more output. * * @param state encoder instance * @returns ::BROTLI_TRUE, if encoder has some unconsumed output * @returns ::BROTLI_FALSE otherwise */ BROTLI_ENC_API BROTLI_BOOL BrotliEncoderHasMoreOutput( BrotliEncoderState* state); /** * Acquires pointer to internal output buffer. * * This method is used to make language bindings easier and more efficient: * -# push data to ::BrotliEncoderCompressStream, * until ::BrotliEncoderHasMoreOutput returns BROTL_TRUE * -# use ::BrotliEncoderTakeOutput 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 ::BrotliEncoderTakeOutput @p *size bytes of * output are considered consumed for all consecutive calls to the * instance methods; returned pointer becomes invalidated as well. * * @note Encoder output is not guaranteed to be contiguous. This means that * after the size-unrestricted call to ::BrotliEncoderTakeOutput, * immediate next call to ::BrotliEncoderTakeOutput may return more data. * * @param state encoder 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_ENC_API const uint8_t* BrotliEncoderTakeOutput( BrotliEncoderState* state, size_t* size); /** * Gets an encoder library version. * * Look at BROTLI_VERSION for more information. */ BROTLI_ENC_API uint32_t BrotliEncoderVersion(void); #if defined(__cplusplus) || defined(c_plusplus) } /* extern "C" */ #endif #endif /* BROTLI_ENC_ENCODE_H_ */
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