mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-27 16:58:09 +01:00
345 lines
14 KiB
C
345 lines
14 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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/**
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* @file
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* API for Brotli decompression.
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*/
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#ifndef BROTLI_DEC_DECODE_H_
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#define BROTLI_DEC_DECODE_H_
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#include <brotli/port.h>
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#include <brotli/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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/**
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* Opaque structure that holds decoder state.
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*
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* Allocated and initialized with ::BrotliDecoderCreateInstance.
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* Cleaned up and deallocated with ::BrotliDecoderDestroyInstance.
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*/
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typedef struct BrotliDecoderStateStruct BrotliDecoderState;
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/**
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* Result type for ::BrotliDecoderDecompress and
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* ::BrotliDecoderDecompressStream functions.
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*/
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typedef enum {
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/** Decoding error, e.g. corrupted input or memory allocation problem. */
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BROTLI_DECODER_RESULT_ERROR = 0,
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/** Decoding successfully completed. */
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BROTLI_DECODER_RESULT_SUCCESS = 1,
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/** Partially done; should be called again with more input. */
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BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT = 2,
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/** Partially done; should be called again with more output. */
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BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT = 3
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} BrotliDecoderResult;
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/**
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* Template that evaluates items of ::BrotliDecoderErrorCode.
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*
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* Example: @code {.cpp}
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* // Log Brotli error code.
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* switch (brotliDecoderErrorCode) {
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* #define CASE_(PREFIX, NAME, CODE) \
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* case BROTLI_DECODER ## PREFIX ## NAME: \
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* LOG(INFO) << "error code:" << #NAME; \
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* break;
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* #define NEWLINE_
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* BROTLI_DECODER_ERROR_CODES_LIST(CASE_, NEWLINE_)
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* #undef CASE_
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* #undef NEWLINE_
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* default: LOG(FATAL) << "unknown brotli error code";
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* }
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* @endcode
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*/
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#define BROTLI_DECODER_ERROR_CODES_LIST(BROTLI_ERROR_CODE, SEPARATOR) \
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BROTLI_ERROR_CODE(_, NO_ERROR, 0) SEPARATOR \
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/* Same as BrotliDecoderResult 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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BROTLI_ERROR_CODE(_ERROR_FORMAT_, DISTANCE, -16) SEPARATOR \
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\
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/* -17..-18 codes are reserved */ \
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\
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BROTLI_ERROR_CODE(_ERROR_, DICTIONARY_NOT_SET, -19) SEPARATOR \
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BROTLI_ERROR_CODE(_ERROR_, INVALID_ARGUMENTS, -20) SEPARATOR \
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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 ring-buffer 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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/**
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* Error code for detailed logging / production debugging.
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*
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* See ::BrotliDecoderGetErrorCode and ::BROTLI_LAST_ERROR_CODE.
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*/
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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_DECODER ## PREFIX ## NAME = CODE
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BROTLI_DECODER_ERROR_CODES_LIST(BROTLI_ERROR_CODE_ENUM_ITEM_, BROTLI_COMMA_)
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} BrotliDecoderErrorCode;
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#undef BROTLI_ERROR_CODE_ENUM_ITEM_
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#undef BROTLI_COMMA_
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/**
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* The value of the last error code, negative integer.
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*
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* All other error code values are in the range from ::BROTLI_LAST_ERROR_CODE
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* to @c -1. There are also 4 other possible non-error codes @c 0 .. @c 3 in
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* ::BrotliDecoderErrorCode enumeration.
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*/
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#define BROTLI_LAST_ERROR_CODE BROTLI_DECODER_ERROR_UNREACHABLE
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/** Options to be used with ::BrotliDecoderSetParameter. */
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typedef enum BrotliDecoderParameter {
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/**
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* Disable "canny" ring buffer allocation strategy.
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*
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* Ring buffer is allocated according to window size, despite the real size of
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* the content.
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*/
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BROTLI_DECODER_PARAM_DISABLE_RING_BUFFER_REALLOCATION = 0,
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/**
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* Flag that determines if "Large Window Brotli" is used.
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*/
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BROTLI_DECODER_PARAM_LARGE_WINDOW = 1
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} BrotliDecoderParameter;
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/**
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* Sets the specified parameter to the given decoder instance.
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*
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* @param state decoder instance
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* @param param parameter to set
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* @param value new parameter value
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* @returns ::BROTLI_FALSE if parameter is unrecognized, or value is invalid
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* @returns ::BROTLI_TRUE if value is accepted
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*/
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BROTLI_DEC_API BROTLI_BOOL BrotliDecoderSetParameter(
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BrotliDecoderState* state, BrotliDecoderParameter param, uint32_t value);
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/**
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* Creates an instance of ::BrotliDecoderState and initializes it.
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*
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* The instance can be used once for decoding and should then be destroyed with
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* ::BrotliDecoderDestroyInstance, it cannot be reused for a new decoding
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* session.
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*
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* @p alloc_func and @p free_func @b MUST be both zero or both non-zero. In the
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* case they are both zero, default memory allocators are used. @p opaque is
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* passed to @p alloc_func and @p free_func when they are called. @p free_func
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* has to return without doing anything when asked to free a NULL pointer.
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*
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* @param alloc_func custom memory allocation function
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* @param free_func custom memory free function
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* @param opaque custom memory manager handle
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* @returns @c 0 if instance can not be allocated or initialized
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* @returns pointer to initialized ::BrotliDecoderState otherwise
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*/
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BROTLI_DEC_API BrotliDecoderState* BrotliDecoderCreateInstance(
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brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque);
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/**
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* Deinitializes and frees ::BrotliDecoderState instance.
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*
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* @param state decoder instance to be cleaned up and deallocated
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*/
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BROTLI_DEC_API void BrotliDecoderDestroyInstance(BrotliDecoderState* state);
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/**
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* Performs one-shot memory-to-memory decompression.
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*
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* Decompresses the data in @p encoded_buffer into @p decoded_buffer, and sets
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* @p *decoded_size to the decompressed length.
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*
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* @param encoded_size size of @p encoded_buffer
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* @param encoded_buffer compressed data buffer with at least @p encoded_size
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* addressable bytes
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* @param[in, out] decoded_size @b in: size of @p decoded_buffer; \n
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* @b out: length of decompressed data written to
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* @p decoded_buffer
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* @param decoded_buffer decompressed data destination buffer
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* @returns ::BROTLI_DECODER_RESULT_ERROR if input is corrupted, memory
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* allocation failed, or @p decoded_buffer is not large enough;
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* @returns ::BROTLI_DECODER_RESULT_SUCCESS otherwise
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*/
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BROTLI_DEC_API BrotliDecoderResult BrotliDecoderDecompress(
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size_t encoded_size,
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const uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(encoded_size)],
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size_t* decoded_size,
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uint8_t decoded_buffer[BROTLI_ARRAY_PARAM(*decoded_size)]);
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/**
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* Decompresses the input stream to the output stream.
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*
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* The values @p *available_in and @p *available_out must specify the number of
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* bytes addressable at @p *next_in and @p *next_out respectively.
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* When @p *available_out is @c 0, @p next_out is allowed to be @c NULL.
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*
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* After each call, @p *available_in will be decremented by the amount of input
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* bytes consumed, and the @p *next_in pointer will be incremented by that
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* amount. Similarly, @p *available_out will be decremented by the amount of
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* output bytes written, and the @p *next_out pointer will be incremented by
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* that amount.
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*
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* @p 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 @p state initialization.
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*
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* @note Input is never overconsumed, so @p next_in and @p available_in could be
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* passed to the next consumer after decoding is complete.
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*
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* @param state decoder instance
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* @param[in, out] available_in @b in: amount of available input; \n
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* @b out: amount of unused input
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* @param[in, out] next_in pointer to the next compressed byte
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* @param[in, out] available_out @b in: length of output buffer; \n
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* @b out: remaining size of output buffer
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* @param[in, out] next_out output buffer cursor;
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* can be @c NULL if @p available_out is @c 0
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* @param[out] total_out number of bytes decompressed so far; can be @c NULL
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* @returns ::BROTLI_DECODER_RESULT_ERROR if input is corrupted, memory
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* allocation failed, arguments were invalid, etc.;
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* use ::BrotliDecoderGetErrorCode to get detailed error code
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* @returns ::BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT decoding is blocked until
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* more input data is provided
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* @returns ::BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT decoding is blocked until
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* more output space is provided
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* @returns ::BROTLI_DECODER_RESULT_SUCCESS decoding is finished, no more
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* input might be consumed and no more output will be produced
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*/
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BROTLI_DEC_API BrotliDecoderResult BrotliDecoderDecompressStream(
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BrotliDecoderState* state, size_t* available_in, const uint8_t** next_in,
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size_t* available_out, uint8_t** next_out, size_t* total_out);
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/**
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* Checks if decoder has more output.
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*
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* @param state decoder instance
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* @returns ::BROTLI_TRUE, if decoder has some unconsumed output
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* @returns ::BROTLI_FALSE otherwise
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*/
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BROTLI_DEC_API BROTLI_BOOL BrotliDecoderHasMoreOutput(
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const BrotliDecoderState* state);
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/**
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* Acquires pointer to internal output buffer.
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*
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* This method is used to make language bindings easier and more efficient:
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* -# push data to ::BrotliDecoderDecompressStream,
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* until ::BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT is reported
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* -# use ::BrotliDecoderTakeOutput to peek bytes and copy to language-specific
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* entity
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*
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* Also this could be useful if there is an output stream that is able to
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* consume all the provided data (e.g. when data is saved to file system).
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*
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* @attention After every call to ::BrotliDecoderTakeOutput @p *size bytes of
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* output are considered consumed for all consecutive calls to the
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* instance methods; returned pointer becomes invalidated as well.
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*
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* @note Decoder output is not guaranteed to be contiguous. This means that
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* after the size-unrestricted call to ::BrotliDecoderTakeOutput,
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* immediate next call to ::BrotliDecoderTakeOutput may return more data.
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*
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* @param state decoder instance
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* @param[in, out] size @b in: number of bytes caller is ready to take, @c 0 if
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* any amount could be handled; \n
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* @b out: amount of data pointed by returned pointer and
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* considered consumed; \n
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* out value is never greater than in value, unless it is @c 0
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* @returns pointer to output data
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*/
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BROTLI_DEC_API const uint8_t* BrotliDecoderTakeOutput(
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BrotliDecoderState* state, size_t* size);
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/**
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* Checks if instance has already consumed input.
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*
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* Instance that returns ::BROTLI_FALSE is considered "fresh" and could be
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* reused.
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*
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* @param state decoder instance
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* @returns ::BROTLI_TRUE if decoder has already used some input bytes
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* @returns ::BROTLI_FALSE otherwise
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*/
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BROTLI_DEC_API BROTLI_BOOL BrotliDecoderIsUsed(const BrotliDecoderState* state);
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/**
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* Checks if decoder instance reached the final state.
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*
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* @param state decoder instance
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* @returns ::BROTLI_TRUE if decoder is in a state where it reached the end of
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* the input and produced all of the output
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* @returns ::BROTLI_FALSE otherwise
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*/
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BROTLI_DEC_API BROTLI_BOOL BrotliDecoderIsFinished(
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const BrotliDecoderState* state);
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/**
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* Acquires a detailed error code.
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*
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* Should be used only after ::BrotliDecoderDecompressStream returns
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* ::BROTLI_DECODER_RESULT_ERROR.
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*
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* See also ::BrotliDecoderErrorString
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*
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* @param state decoder instance
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* @returns last saved error code
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*/
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BROTLI_DEC_API BrotliDecoderErrorCode BrotliDecoderGetErrorCode(
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const BrotliDecoderState* state);
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/**
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* Converts error code to a c-string.
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*/
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BROTLI_DEC_API const char* BrotliDecoderErrorString(BrotliDecoderErrorCode c);
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/**
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* Gets a decoder library version.
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*
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* Look at BROTLI_VERSION for more information.
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*/
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BROTLI_DEC_API uint32_t BrotliDecoderVersion(void);
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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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