-/* LZ4 Kernel Interface
- *
- * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
- * Copyright (C) 2016, Sven Schmidt <4sschmid@informatik.uni-hamburg.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This file is based on the original header file
- * for LZ4 - Fast LZ compression algorithm.
- *
- * LZ4 - Fast LZ compression algorithm
- * Copyright (C) 2011-2016, Yann Collet.
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * You can contact the author at :
- * - LZ4 homepage : http://www.lz4.org
- * - LZ4 source repository : https://github.com/lz4/lz4
- */
+#include <lz4.h>
-#ifndef __LZ4_H__
-#define __LZ4_H__
+#define LZ4_compress_destSize(src, dst, srclen, dstlen, workspace) \
+ LZ4_compress_destSize(src, dst, srclen, dstlen)
-#include <linux/types.h>
-#include <linux/string.h> /* memset, memcpy */
+#define LZ4_compress_HC(src, dst, srclen, dstlen, level, workspace) -1
-/*-************************************************************************
- * CONSTANTS
- **************************************************************************/
-/*
- * LZ4_MEMORY_USAGE :
- * Memory usage formula : N->2^N Bytes
- * (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
- * Increasing memory usage improves compression ratio
- * Reduced memory usage can improve speed, due to cache effect
- * Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
- */
-#define LZ4_MEMORY_USAGE 14
-
-#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
-#define LZ4_COMPRESSBOUND(isize) (\
- (unsigned int)(isize) > (unsigned int)LZ4_MAX_INPUT_SIZE \
- ? 0 \
- : (isize) + ((isize)/255) + 16)
-
-#define LZ4_ACCELERATION_DEFAULT 1
-#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
-#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
-#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG)
-
-#define LZ4HC_MIN_CLEVEL 3
-#define LZ4HC_DEFAULT_CLEVEL 9
-#define LZ4HC_MAX_CLEVEL 16
-
-#define LZ4HC_DICTIONARY_LOGSIZE 16
-#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE)
-#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1)
-#define LZ4HC_HASH_LOG (LZ4HC_DICTIONARY_LOGSIZE - 1)
-#define LZ4HC_HASHTABLESIZE (1 << LZ4HC_HASH_LOG)
-#define LZ4HC_HASH_MASK (LZ4HC_HASHTABLESIZE - 1)
-
-/*-************************************************************************
- * STREAMING CONSTANTS AND STRUCTURES
- **************************************************************************/
-#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE - 3)) + 4)
-#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long))
-
-#define LZ4_STREAMHCSIZE 262192
-#define LZ4_STREAMHCSIZE_SIZET (262192 / sizeof(size_t))
-
-#define LZ4_STREAMDECODESIZE_U64 4
-#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * \
- sizeof(unsigned long long))
-
-/*
- * LZ4_stream_t - information structure to track an LZ4 stream.
- */
-typedef struct {
- uint32_t hashTable[LZ4_HASH_SIZE_U32];
- uint32_t currentOffset;
- uint32_t initCheck;
- const uint8_t *dictionary;
- uint8_t *bufferStart;
- uint32_t dictSize;
-} LZ4_stream_t_internal;
-typedef union {
- unsigned long long table[LZ4_STREAMSIZE_U64];
- LZ4_stream_t_internal internal_donotuse;
-} LZ4_stream_t;
-
-/*
- * LZ4_streamHC_t - information structure to track an LZ4HC stream.
- */
-typedef struct {
- unsigned int hashTable[LZ4HC_HASHTABLESIZE];
- unsigned short chainTable[LZ4HC_MAXD];
- /* next block to continue on current prefix */
- const unsigned char *end;
- /* All index relative to this position */
- const unsigned char *base;
- /* alternate base for extDict */
- const unsigned char *dictBase;
- /* below that point, need extDict */
- unsigned int dictLimit;
- /* below that point, no more dict */
- unsigned int lowLimit;
- /* index from which to continue dict update */
- unsigned int nextToUpdate;
- unsigned int compressionLevel;
-} LZ4HC_CCtx_internal;
-typedef union {
- size_t table[LZ4_STREAMHCSIZE_SIZET];
- LZ4HC_CCtx_internal internal_donotuse;
-} LZ4_streamHC_t;
-
-/*
- * LZ4_streamDecode_t - information structure to track an
- * LZ4 stream during decompression.
- *
- * init this structure using LZ4_setStreamDecode (or memset()) before first use
- */
-typedef struct {
- const uint8_t *externalDict;
- size_t extDictSize;
- const uint8_t *prefixEnd;
- size_t prefixSize;
-} LZ4_streamDecode_t_internal;
-typedef union {
- unsigned long long table[LZ4_STREAMDECODESIZE_U64];
- LZ4_streamDecode_t_internal internal_donotuse;
-} LZ4_streamDecode_t;
-
-/*-************************************************************************
- * SIZE OF STATE
- **************************************************************************/
-#define LZ4_MEM_COMPRESS LZ4_STREAMSIZE
-#define LZ4HC_MEM_COMPRESS LZ4_STREAMHCSIZE
-
-/*-************************************************************************
- * Compression Functions
- **************************************************************************/
-
-/**
- * LZ4_compressBound() - Max. output size in worst case szenarios
- * @isize: Size of the input data
- *
- * Return: Max. size LZ4 may output in a "worst case" szenario
- * (data not compressible)
- */
-static inline int LZ4_compressBound(size_t isize)
-{
- return LZ4_COMPRESSBOUND(isize);
-}
-
-/**
- * LZ4_compress_default() - Compress data from source to dest
- * @source: source address of the original data
- * @dest: output buffer address of the compressed data
- * @inputSize: size of the input data. Max supported value is LZ4_MAX_INPUT_SIZE
- * @maxOutputSize: full or partial size of buffer 'dest'
- * which must be already allocated
- * @wrkmem: address of the working memory.
- * This requires 'workmem' of LZ4_MEM_COMPRESS.
- *
- * Compresses 'sourceSize' bytes from buffer 'source'
- * into already allocated 'dest' buffer of size 'maxOutputSize'.
- * Compression is guaranteed to succeed if
- * 'maxOutputSize' >= LZ4_compressBound(inputSize).
- * It also runs faster, so it's a recommended setting.
- * If the function cannot compress 'source' into a more limited 'dest' budget,
- * compression stops *immediately*, and the function result is zero.
- * As a consequence, 'dest' content is not valid.
- *
- * Return: Number of bytes written into buffer 'dest'
- * (necessarily <= maxOutputSize) or 0 if compression fails
- */
-int LZ4_compress_default(const char *source, char *dest, int inputSize,
- int maxOutputSize, void *wrkmem);
-
-/**
- * LZ4_compress_fast() - As LZ4_compress_default providing an acceleration param
- * @source: source address of the original data
- * @dest: output buffer address of the compressed data
- * @inputSize: size of the input data. Max supported value is LZ4_MAX_INPUT_SIZE
- * @maxOutputSize: full or partial size of buffer 'dest'
- * which must be already allocated
- * @acceleration: acceleration factor
- * @wrkmem: address of the working memory.
- * This requires 'workmem' of LZ4_MEM_COMPRESS.
- *
- * Same as LZ4_compress_default(), but allows to select an "acceleration"
- * factor. The larger the acceleration value, the faster the algorithm,
- * but also the lesser the compression. It's a trade-off. It can be fine tuned,
- * with each successive value providing roughly +~3% to speed.
- * An acceleration value of "1" is the same as regular LZ4_compress_default()
- * Values <= 0 will be replaced by LZ4_ACCELERATION_DEFAULT, which is 1.
- *
- * Return: Number of bytes written into buffer 'dest'
- * (necessarily <= maxOutputSize) or 0 if compression fails
- */
-int LZ4_compress_fast(const char *source, char *dest, int inputSize,
- int maxOutputSize, int acceleration, void *wrkmem);
-
-/**
- * LZ4_compress_destSize() - Compress as much data as possible
- * from source to dest
- * @source: source address of the original data
- * @dest: output buffer address of the compressed data
- * @sourceSizePtr: will be modified to indicate how many bytes where read
- * from 'source' to fill 'dest'. New value is necessarily <= old value.
- * @targetDestSize: Size of buffer 'dest' which must be already allocated
- * @wrkmem: address of the working memory.
- * This requires 'workmem' of LZ4_MEM_COMPRESS.
- *
- * Reverse the logic, by compressing as much data as possible
- * from 'source' buffer into already allocated buffer 'dest'
- * of size 'targetDestSize'.
- * This function either compresses the entire 'source' content into 'dest'
- * if it's large enough, or fill 'dest' buffer completely with as much data as
- * possible from 'source'.
- *
- * Return: Number of bytes written into 'dest' (necessarily <= targetDestSize)
- * or 0 if compression fails
- */
-int LZ4_compress_destSize(const char *source, char *dest, int *sourceSizePtr,
- int targetDestSize, void *wrkmem);
-
-/*-************************************************************************
- * Decompression Functions
- **************************************************************************/
-
-/**
- * LZ4_decompress_fast() - Decompresses data from 'source' into 'dest'
- * @source: source address of the compressed data
- * @dest: output buffer address of the uncompressed data
- * which must be already allocated with 'originalSize' bytes
- * @originalSize: is the original and therefore uncompressed size
- *
- * Decompresses data from 'source' into 'dest'.
- * This function fully respect memory boundaries for properly formed
- * compressed data.
- * It is a bit faster than LZ4_decompress_safe().
- * However, it does not provide any protection against intentionally
- * modified data stream (malicious input).
- * Use this function in trusted environment only
- * (data to decode comes from a trusted source).
- *
- * Return: number of bytes read from the source buffer
- * or a negative result if decompression fails.
- */
-int LZ4_decompress_fast(const char *source, char *dest, int originalSize);
-
-/**
- * LZ4_decompress_safe() - Decompression protected against buffer overflow
- * @source: source address of the compressed data
- * @dest: output buffer address of the uncompressed data
- * which must be already allocated
- * @compressedSize: is the precise full size of the compressed block
- * @maxDecompressedSize: is the size of 'dest' buffer
- *
- * Decompresses data fom 'source' into 'dest'.
- * If the source stream is detected malformed, the function will
- * stop decoding and return a negative result.
- * This function is protected against buffer overflow exploits,
- * including malicious data packets. It never writes outside output buffer,
- * nor reads outside input buffer.
- *
- * Return: number of bytes decompressed into destination buffer
- * (necessarily <= maxDecompressedSize)
- * or a negative result in case of error
- */
-int LZ4_decompress_safe(const char *source, char *dest, int compressedSize,
- int maxDecompressedSize);
-
-/**
- * LZ4_decompress_safe_partial() - Decompress a block of size 'compressedSize'
- * at position 'source' into buffer 'dest'
- * @source: source address of the compressed data
- * @dest: output buffer address of the decompressed data which must be
- * already allocated
- * @compressedSize: is the precise full size of the compressed block.
- * @targetOutputSize: the decompression operation will try
- * to stop as soon as 'targetOutputSize' has been reached
- * @maxDecompressedSize: is the size of destination buffer
- *
- * This function decompresses a compressed block of size 'compressedSize'
- * at position 'source' into destination buffer 'dest'
- * of size 'maxDecompressedSize'.
- * The function tries to stop decompressing operation as soon as
- * 'targetOutputSize' has been reached, reducing decompression time.
- * This function never writes outside of output buffer,
- * and never reads outside of input buffer.
- * It is therefore protected against malicious data packets.
- *
- * Return: the number of bytes decoded in the destination buffer
- * (necessarily <= maxDecompressedSize)
- * or a negative result in case of error
- *
- */
-int LZ4_decompress_safe_partial(const char *source, char *dest,
- int compressedSize, int targetOutputSize, int maxDecompressedSize);
-
-/*-************************************************************************
- * LZ4 HC Compression
- **************************************************************************/
-
-/**
- * LZ4_compress_HC() - Compress data from `src` into `dst`, using HC algorithm
- * @src: source address of the original data
- * @dst: output buffer address of the compressed data
- * @srcSize: size of the input data. Max supported value is LZ4_MAX_INPUT_SIZE
- * @dstCapacity: full or partial size of buffer 'dst',
- * which must be already allocated
- * @compressionLevel: Recommended values are between 4 and 9, although any
- * value between 1 and LZ4HC_MAX_CLEVEL will work.
- * Values >LZ4HC_MAX_CLEVEL behave the same as 16.
- * @wrkmem: address of the working memory.
- * This requires 'wrkmem' of size LZ4HC_MEM_COMPRESS.
- *
- * Compress data from 'src' into 'dst', using the more powerful
- * but slower "HC" algorithm. Compression is guaranteed to succeed if
- * `dstCapacity >= LZ4_compressBound(srcSize)
- *
- * Return : the number of bytes written into 'dst' or 0 if compression fails.
- */
-int LZ4_compress_HC(const char *src, char *dst, int srcSize, int dstCapacity,
- int compressionLevel, void *wrkmem);
-
-/**
- * LZ4_resetStreamHC() - Init an allocated 'LZ4_streamHC_t' structure
- * @streamHCPtr: pointer to the 'LZ4_streamHC_t' structure
- * @compressionLevel: Recommended values are between 4 and 9, although any
- * value between 1 and LZ4HC_MAX_CLEVEL will work.
- * Values >LZ4HC_MAX_CLEVEL behave the same as 16.
- *
- * An LZ4_streamHC_t structure can be allocated once
- * and re-used multiple times.
- * Use this function to init an allocated `LZ4_streamHC_t` structure
- * and start a new compression.
- */
-void LZ4_resetStreamHC(LZ4_streamHC_t *streamHCPtr, int compressionLevel);
-
-/**
- * LZ4_loadDictHC() - Load a static dictionary into LZ4_streamHC
- * @streamHCPtr: pointer to the LZ4HC_stream_t
- * @dictionary: dictionary to load
- * @dictSize: size of dictionary
- *
- * Use this function to load a static dictionary into LZ4HC_stream.
- * Any previous data will be forgotten, only 'dictionary'
- * will remain in memory.
- * Loading a size of 0 is allowed.
- *
- * Return : dictionary size, in bytes (necessarily <= 64 KB)
- */
-int LZ4_loadDictHC(LZ4_streamHC_t *streamHCPtr, const char *dictionary,
- int dictSize);
-
-/**
- * LZ4_compress_HC_continue() - Compress 'src' using data from previously
- * compressed blocks as a dictionary using the HC algorithm
- * @streamHCPtr: Pointer to the previous 'LZ4_streamHC_t' structure
- * @src: source address of the original data
- * @dst: output buffer address of the compressed data,
- * which must be already allocated
- * @srcSize: size of the input data. Max supported value is LZ4_MAX_INPUT_SIZE
- * @maxDstSize: full or partial size of buffer 'dest'
- * which must be already allocated
- *
- * These functions compress data in successive blocks of any size, using
- * previous blocks as dictionary. One key assumption is that previous
- * blocks (up to 64 KB) remain read-accessible while
- * compressing next blocks. There is an exception for ring buffers,
- * which can be smaller than 64 KB.
- * Ring buffers scenario is automatically detected and handled by
- * LZ4_compress_HC_continue().
- * Before starting compression, state must be properly initialized,
- * using LZ4_resetStreamHC().
- * A first "fictional block" can then be designated as
- * initial dictionary, using LZ4_loadDictHC() (Optional).
- * Then, use LZ4_compress_HC_continue()
- * to compress each successive block. Previous memory blocks
- * (including initial dictionary when present) must remain accessible
- * and unmodified during compression.
- * 'dst' buffer should be sized to handle worst case scenarios, using
- * LZ4_compressBound(), to ensure operation success.
- * If, for any reason, previous data blocks can't be preserved unmodified
- * in memory during next compression block,
- * you must save it to a safer memory space, using LZ4_saveDictHC().
- * Return value of LZ4_saveDictHC() is the size of dictionary
- * effectively saved into 'safeBuffer'.
- *
- * Return: Number of bytes written into buffer 'dst' or 0 if compression fails
- */
-int LZ4_compress_HC_continue(LZ4_streamHC_t *streamHCPtr, const char *src,
- char *dst, int srcSize, int maxDstSize);
-
-/**
- * LZ4_saveDictHC() - Save static dictionary from LZ4HC_stream
- * @streamHCPtr: pointer to the 'LZ4HC_stream_t' structure
- * @safeBuffer: buffer to save dictionary to, must be already allocated
- * @maxDictSize: size of 'safeBuffer'
- *
- * If previously compressed data block is not guaranteed
- * to remain available at its memory location,
- * save it into a safer place (char *safeBuffer).
- * Note : you don't need to call LZ4_loadDictHC() afterwards,
- * dictionary is immediately usable, you can therefore call
- * LZ4_compress_HC_continue().
- *
- * Return : saved dictionary size in bytes (necessarily <= maxDictSize),
- * or 0 if error.
- */
-int LZ4_saveDictHC(LZ4_streamHC_t *streamHCPtr, char *safeBuffer,
- int maxDictSize);
-
-/*-*********************************************
- * Streaming Compression Functions
- ***********************************************/
-
-/**
- * LZ4_resetStream() - Init an allocated 'LZ4_stream_t' structure
- * @LZ4_stream: pointer to the 'LZ4_stream_t' structure
- *
- * An LZ4_stream_t structure can be allocated once
- * and re-used multiple times.
- * Use this function to init an allocated `LZ4_stream_t` structure
- * and start a new compression.
- */
-void LZ4_resetStream(LZ4_stream_t *LZ4_stream);
-
-/**
- * LZ4_loadDict() - Load a static dictionary into LZ4_stream
- * @streamPtr: pointer to the LZ4_stream_t
- * @dictionary: dictionary to load
- * @dictSize: size of dictionary
- *
- * Use this function to load a static dictionary into LZ4_stream.
- * Any previous data will be forgotten, only 'dictionary'
- * will remain in memory.
- * Loading a size of 0 is allowed.
- *
- * Return : dictionary size, in bytes (necessarily <= 64 KB)
- */
-int LZ4_loadDict(LZ4_stream_t *streamPtr, const char *dictionary,
- int dictSize);
-
-/**
- * LZ4_saveDict() - Save static dictionary from LZ4_stream
- * @streamPtr: pointer to the 'LZ4_stream_t' structure
- * @safeBuffer: buffer to save dictionary to, must be already allocated
- * @dictSize: size of 'safeBuffer'
- *
- * If previously compressed data block is not guaranteed
- * to remain available at its memory location,
- * save it into a safer place (char *safeBuffer).
- * Note : you don't need to call LZ4_loadDict() afterwards,
- * dictionary is immediately usable, you can therefore call
- * LZ4_compress_fast_continue().
- *
- * Return : saved dictionary size in bytes (necessarily <= dictSize),
- * or 0 if error.
- */
-int LZ4_saveDict(LZ4_stream_t *streamPtr, char *safeBuffer, int dictSize);
-
-/**
- * LZ4_compress_fast_continue() - Compress 'src' using data from previously
- * compressed blocks as a dictionary
- * @streamPtr: Pointer to the previous 'LZ4_stream_t' structure
- * @src: source address of the original data
- * @dst: output buffer address of the compressed data,
- * which must be already allocated
- * @srcSize: size of the input data. Max supported value is LZ4_MAX_INPUT_SIZE
- * @maxDstSize: full or partial size of buffer 'dest'
- * which must be already allocated
- * @acceleration: acceleration factor
- *
- * Compress buffer content 'src', using data from previously compressed blocks
- * as dictionary to improve compression ratio.
- * Important : Previous data blocks are assumed to still
- * be present and unmodified !
- * If maxDstSize >= LZ4_compressBound(srcSize),
- * compression is guaranteed to succeed, and runs faster.
- *
- * Return: Number of bytes written into buffer 'dst' or 0 if compression fails
- */
-int LZ4_compress_fast_continue(LZ4_stream_t *streamPtr, const char *src,
- char *dst, int srcSize, int maxDstSize, int acceleration);
-
-/**
- * LZ4_setStreamDecode() - Instruct where to find dictionary
- * @LZ4_streamDecode: the 'LZ4_streamDecode_t' structure
- * @dictionary: dictionary to use
- * @dictSize: size of dictionary
- *
- * Use this function to instruct where to find the dictionary.
- * Setting a size of 0 is allowed (same effect as reset).
- *
- * Return: 1 if OK, 0 if error
- */
-int LZ4_setStreamDecode(LZ4_streamDecode_t *LZ4_streamDecode,
- const char *dictionary, int dictSize);
-
-/**
- * LZ4_decompress_fast_continue() - Decompress blocks in streaming mode
- * @LZ4_streamDecode: the 'LZ4_streamDecode_t' structure
- * @source: source address of the compressed data
- * @dest: output buffer address of the uncompressed data
- * which must be already allocated
- * @compressedSize: is the precise full size of the compressed block
- * @maxDecompressedSize: is the size of 'dest' buffer
- *
- * These decoding function allows decompression of multiple blocks
- * in "streaming" mode.
- * Previously decoded blocks *must* remain available at the memory position
- * where they were decoded (up to 64 KB)
- * In the case of a ring buffers, decoding buffer must be either :
- * - Exactly same size as encoding buffer, with same update rule
- * (block boundaries at same positions) In which case,
- * the decoding & encoding ring buffer can have any size,
- * including very small ones ( < 64 KB).
- * - Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
- * maxBlockSize is implementation dependent.
- * It's the maximum size you intend to compress into a single block.
- * In which case, encoding and decoding buffers do not need
- * to be synchronized, and encoding ring buffer can have any size,
- * including small ones ( < 64 KB).
- * - _At least_ 64 KB + 8 bytes + maxBlockSize.
- * In which case, encoding and decoding buffers do not need to be
- * synchronized, and encoding ring buffer can have any size,
- * including larger than decoding buffer. W
- * Whenever these conditions are not possible, save the last 64KB of decoded
- * data into a safe buffer, and indicate where it is saved
- * using LZ4_setStreamDecode()
- *
- * Return: number of bytes decompressed into destination buffer
- * (necessarily <= maxDecompressedSize)
- * or a negative result in case of error
- */
-int LZ4_decompress_safe_continue(LZ4_streamDecode_t *LZ4_streamDecode,
- const char *source, char *dest, int compressedSize,
- int maxDecompressedSize);
-
-/**
- * LZ4_decompress_fast_continue() - Decompress blocks in streaming mode
- * @LZ4_streamDecode: the 'LZ4_streamDecode_t' structure
- * @source: source address of the compressed data
- * @dest: output buffer address of the uncompressed data
- * which must be already allocated with 'originalSize' bytes
- * @originalSize: is the original and therefore uncompressed size
- *
- * These decoding function allows decompression of multiple blocks
- * in "streaming" mode.
- * Previously decoded blocks *must* remain available at the memory position
- * where they were decoded (up to 64 KB)
- * In the case of a ring buffers, decoding buffer must be either :
- * - Exactly same size as encoding buffer, with same update rule
- * (block boundaries at same positions) In which case,
- * the decoding & encoding ring buffer can have any size,
- * including very small ones ( < 64 KB).
- * - Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
- * maxBlockSize is implementation dependent.
- * It's the maximum size you intend to compress into a single block.
- * In which case, encoding and decoding buffers do not need
- * to be synchronized, and encoding ring buffer can have any size,
- * including small ones ( < 64 KB).
- * - _At least_ 64 KB + 8 bytes + maxBlockSize.
- * In which case, encoding and decoding buffers do not need to be
- * synchronized, and encoding ring buffer can have any size,
- * including larger than decoding buffer. W
- * Whenever these conditions are not possible, save the last 64KB of decoded
- * data into a safe buffer, and indicate where it is saved
- * using LZ4_setStreamDecode()
- *
- * Return: number of bytes decompressed into destination buffer
- * (necessarily <= maxDecompressedSize)
- * or a negative result in case of error
- */
-int LZ4_decompress_fast_continue(LZ4_streamDecode_t *LZ4_streamDecode,
- const char *source, char *dest, int originalSize);
-
-/**
- * LZ4_decompress_safe_usingDict() - Same as LZ4_setStreamDecode()
- * followed by LZ4_decompress_safe_continue()
- * @source: source address of the compressed data
- * @dest: output buffer address of the uncompressed data
- * which must be already allocated
- * @compressedSize: is the precise full size of the compressed block
- * @maxDecompressedSize: is the size of 'dest' buffer
- * @dictStart: pointer to the start of the dictionary in memory
- * @dictSize: size of dictionary
- *
- * These decoding function works the same as
- * a combination of LZ4_setStreamDecode() followed by
- * LZ4_decompress_safe_continue()
- * It is stand-alone, and don'tn eed a LZ4_streamDecode_t structure.
- *
- * Return: number of bytes decompressed into destination buffer
- * (necessarily <= maxDecompressedSize)
- * or a negative result in case of error
- */
-int LZ4_decompress_safe_usingDict(const char *source, char *dest,
- int compressedSize, int maxDecompressedSize, const char *dictStart,
- int dictSize);
-
-/**
- * LZ4_decompress_fast_usingDict() - Same as LZ4_setStreamDecode()
- * followed by LZ4_decompress_fast_continue()
- * @source: source address of the compressed data
- * @dest: output buffer address of the uncompressed data
- * which must be already allocated with 'originalSize' bytes
- * @originalSize: is the original and therefore uncompressed size
- * @dictStart: pointer to the start of the dictionary in memory
- * @dictSize: size of dictionary
- *
- * These decoding function works the same as
- * a combination of LZ4_setStreamDecode() followed by
- * LZ4_decompress_safe_continue()
- * It is stand-alone, and don'tn eed a LZ4_streamDecode_t structure.
- *
- * Return: number of bytes decompressed into destination buffer
- * (necessarily <= maxDecompressedSize)
- * or a negative result in case of error
- */
-int LZ4_decompress_fast_usingDict(const char *source, char *dest,
- int originalSize, const char *dictStart, int dictSize);
-
-#endif
+#define LZ4_MEM_COMPRESS 0
+#define LZ4HC_MEM_COMPRESS 0
+#define LZ4HC_MIN_CLEVEL 0
projects / bcachefs-tools-debian / blobdiff