163 lines
7.8 KiB
C
163 lines
7.8 KiB
C
/* Copyright 2013 Google Inc. All Rights Reserved.
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Distributed under MIT license.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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/* API for Brotli decompression */
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#ifndef BROTLI_DEC_DECODE_H_
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#define BROTLI_DEC_DECODE_H_
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#include "./types.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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typedef struct BrotliStateStruct BrotliState;
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typedef enum {
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/* Decoding error, e.g. corrupt input or memory allocation problem */
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BROTLI_RESULT_ERROR = 0,
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/* Decoding successfully completed */
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BROTLI_RESULT_SUCCESS = 1,
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/* Partially done; should be called again with more input */
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BROTLI_RESULT_NEEDS_MORE_INPUT = 2,
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/* Partially done; should be called again with more output */
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BROTLI_RESULT_NEEDS_MORE_OUTPUT = 3
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} BrotliResult;
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#define BROTLI_ERROR_CODES_LIST(BROTLI_ERROR_CODE, SEPARATOR) \
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BROTLI_ERROR_CODE(_, NO_ERROR, 0) SEPARATOR \
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/* Same as BrotliResult values */ \
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BROTLI_ERROR_CODE(_, SUCCESS, 1) SEPARATOR \
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BROTLI_ERROR_CODE(_, NEEDS_MORE_INPUT, 2) SEPARATOR \
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BROTLI_ERROR_CODE(_, NEEDS_MORE_OUTPUT, 3) SEPARATOR \
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\
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/* Errors caused by invalid input */ \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, EXUBERANT_NIBBLE, -1) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, RESERVED, -2) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, EXUBERANT_META_NIBBLE, -3) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, SIMPLE_HUFFMAN_ALPHABET, -4) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, SIMPLE_HUFFMAN_SAME, -5) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, CL_SPACE, -6) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, HUFFMAN_SPACE, -7) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, CONTEXT_MAP_REPEAT, -8) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, BLOCK_LENGTH_1, -9) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, BLOCK_LENGTH_2, -10) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, TRANSFORM, -11) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, DICTIONARY, -12) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, WINDOW_BITS, -13) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, PADDING_1, -14) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_FORMAT_, PADDING_2, -15) SEPARATOR \
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\
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/* -16..-20 codes are reserved */ \
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\
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/* Memory allocation problems */ \
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BROTLI_ERROR_CODE(_ERROR_ALLOC_, CONTEXT_MODES, -21) SEPARATOR \
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/* Literal, insert and distance trees together */ \
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BROTLI_ERROR_CODE(_ERROR_ALLOC_, TREE_GROUPS, -22) SEPARATOR \
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/* -23..-24 codes are reserved for distinct tree groups */ \
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BROTLI_ERROR_CODE(_ERROR_ALLOC_, CONTEXT_MAP, -25) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_ALLOC_, RING_BUFFER_1, -26) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_ALLOC_, RING_BUFFER_2, -27) SEPARATOR \
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/* -28..-29 codes are reserved for dynamic ringbuffer allocation */ \
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BROTLI_ERROR_CODE(_ERROR_ALLOC_, BLOCK_TYPE_TREES, -30) SEPARATOR \
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\
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/* "Impossible" states */ \
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BROTLI_ERROR_CODE(_ERROR_, UNREACHABLE, -31)
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typedef enum {
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#define _BROTLI_COMMA ,
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#define _BROTLI_ERROR_CODE_ENUM_ITEM(PREFIX, NAME, CODE) \
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BROTLI ## PREFIX ## NAME = CODE
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BROTLI_ERROR_CODES_LIST(_BROTLI_ERROR_CODE_ENUM_ITEM, _BROTLI_COMMA)
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#undef _BROTLI_ERROR_CODE_ENUM_ITEM
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#undef _BROTLI_COMMA
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} BrotliErrorCode;
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#define BROTLI_LAST_ERROR_CODE BROTLI_ERROR_UNREACHABLE
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/* Creates the instance of BrotliState and initializes it. |alloc_func| and
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|free_func| MUST be both zero or both non-zero. In the case they are both
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zero, default memory allocators are used. |opaque| is passed to |alloc_func|
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and |free_func| when they are called. */
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BrotliState* BrotliCreateState(
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brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque);
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/* Deinitializes and frees BrotliState instance. */
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void BrotliDestroyState(BrotliState* state);
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/* Sets |*decoded_size| to the decompressed size of the given encoded stream.
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This function only works if the encoded buffer has a single meta block,
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or if it has two meta-blocks, where the first is uncompressed and the
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second is empty.
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Returns 1 on success, 0 on failure. */
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int BrotliDecompressedSize(size_t encoded_size,
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const uint8_t* encoded_buffer,
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size_t* decoded_size);
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/* Decompresses the data in |encoded_buffer| into |decoded_buffer|, and sets
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|*decoded_size| to the decompressed length. */
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BrotliResult BrotliDecompressBuffer(size_t encoded_size,
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const uint8_t* encoded_buffer,
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size_t* decoded_size,
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uint8_t* decoded_buffer);
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/* Decompresses the data. Supports partial input and output.
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Must be called with an allocated input buffer in |*next_in| and an allocated
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output buffer in |*next_out|. The values |*available_in| and |*available_out|
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must specify the allocated size in |*next_in| and |*next_out| respectively.
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After each call, |*available_in| will be decremented by the amount of input
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bytes consumed, and the |*next_in| pointer will be incremented by that
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amount. Similarly, |*available_out| will be decremented by the amount of
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output bytes written, and the |*next_out| pointer will be incremented by that
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amount. |total_out|, if it is not a null-pointer, will be set to the number
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of bytes decompressed since the last state initialization.
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Input is never overconsumed, so |next_in| and |available_in| could be passed
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to the next consumer after decoding is complete. */
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BrotliResult BrotliDecompressStream(size_t* available_in,
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const uint8_t** next_in,
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size_t* available_out,
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uint8_t** next_out,
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size_t* total_out,
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BrotliState* s);
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/* Fills the new state with a dictionary for LZ77, warming up the ringbuffer,
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e.g. for custom static dictionaries for data formats.
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Not to be confused with the built-in transformable dictionary of Brotli.
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|size| should be less or equal to 2^24 (16MiB), otherwise the dictionary will
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be ignored. The dictionary must exist in memory until decoding is done and
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is owned by the caller. To use:
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1) Allocate and initialize state with BrotliCreateState
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2) Use BrotliSetCustomDictionary
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3) Use BrotliDecompressStream
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4) Clean up and free state with BrotliDestroyState
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*/
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void BrotliSetCustomDictionary(
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size_t size, const uint8_t* dict, BrotliState* s);
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/* Returns 1, if s is in a state where we have not read any input bytes yet,
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and 0 otherwise */
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int BrotliStateIsStreamStart(const BrotliState* s);
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/* Returns 1, if s is in a state where we reached the end of the input and
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produced all of the output, and 0 otherwise. */
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int BrotliStateIsStreamEnd(const BrotliState* s);
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/* Returns detailed error code after BrotliDecompressStream returns
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BROTLI_RESULT_ERROR. */
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BrotliErrorCode BrotliGetErrorCode(const BrotliState* s);
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const char* BrotliErrorString(BrotliErrorCode c);
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#if defined(__cplusplus) || defined(c_plusplus)
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} /* extern "C" */
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#endif
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#endif /* BROTLI_DEC_DECODE_H_ */
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