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Diffstat (limited to 'util/cbfstool/lz4/lib/lz4frame.h')
| -rw-r--r-- | util/cbfstool/lz4/lib/lz4frame.h | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/util/cbfstool/lz4/lib/lz4frame.h b/util/cbfstool/lz4/lib/lz4frame.h new file mode 100644 index 0000000000..c039e5d559 --- /dev/null +++ b/util/cbfstool/lz4/lib/lz4frame.h @@ -0,0 +1,303 @@ +/* + LZ4 auto-framing library + Header File + Copyright (C) 2011-2015, 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 source repository : https://github.com/Cyan4973/lz4 + - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c +*/ + +/* LZ4F is a stand-alone API to create LZ4-compressed frames + * conformant with specification v1.5.1. + * All related operations, including memory management, are handled internally by the library. + * You don't need lz4.h when using lz4frame.h. + * */ + +#pragma once + +#if defined (__cplusplus) +extern "C" { +#endif + +/************************************** +* Includes +**************************************/ +#include <stddef.h> /* size_t */ + + +/************************************** +* Error management +**************************************/ +typedef size_t LZ4F_errorCode_t; + +unsigned LZ4F_isError(LZ4F_errorCode_t code); +const char* LZ4F_getErrorName(LZ4F_errorCode_t code); /* return error code string; useful for debugging */ + + +/************************************** +* Frame compression types +**************************************/ +//#define LZ4F_DISABLE_OBSOLETE_ENUMS +#ifndef LZ4F_DISABLE_OBSOLETE_ENUMS +# define LZ4F_OBSOLETE_ENUM(x) ,x +#else +# define LZ4F_OBSOLETE_ENUM(x) +#endif + +typedef enum { + LZ4F_default=0, + LZ4F_max64KB=4, + LZ4F_max256KB=5, + LZ4F_max1MB=6, + LZ4F_max4MB=7 + LZ4F_OBSOLETE_ENUM(max64KB = LZ4F_max64KB) + LZ4F_OBSOLETE_ENUM(max256KB = LZ4F_max256KB) + LZ4F_OBSOLETE_ENUM(max1MB = LZ4F_max1MB) + LZ4F_OBSOLETE_ENUM(max4MB = LZ4F_max4MB) +} LZ4F_blockSizeID_t; + +typedef enum { + LZ4F_blockLinked=0, + LZ4F_blockIndependent + LZ4F_OBSOLETE_ENUM(blockLinked = LZ4F_blockLinked) + LZ4F_OBSOLETE_ENUM(blockIndependent = LZ4F_blockIndependent) +} LZ4F_blockMode_t; + +typedef enum { + LZ4F_noContentChecksum=0, + LZ4F_contentChecksumEnabled + LZ4F_OBSOLETE_ENUM(noContentChecksum = LZ4F_noContentChecksum) + LZ4F_OBSOLETE_ENUM(contentChecksumEnabled = LZ4F_contentChecksumEnabled) +} LZ4F_contentChecksum_t; + +typedef enum { + LZ4F_frame=0, + LZ4F_skippableFrame + LZ4F_OBSOLETE_ENUM(skippableFrame = LZ4F_skippableFrame) +} LZ4F_frameType_t; + +#ifndef LZ4F_DISABLE_OBSOLETE_ENUMS +typedef LZ4F_blockSizeID_t blockSizeID_t; +typedef LZ4F_blockMode_t blockMode_t; +typedef LZ4F_frameType_t frameType_t; +typedef LZ4F_contentChecksum_t contentChecksum_t; +#endif + +typedef struct { + LZ4F_blockSizeID_t blockSizeID; /* max64KB, max256KB, max1MB, max4MB ; 0 == default */ + LZ4F_blockMode_t blockMode; /* blockLinked, blockIndependent ; 0 == default */ + LZ4F_contentChecksum_t contentChecksumFlag; /* noContentChecksum, contentChecksumEnabled ; 0 == default */ + LZ4F_frameType_t frameType; /* LZ4F_frame, skippableFrame ; 0 == default */ + unsigned long long contentSize; /* Size of uncompressed (original) content ; 0 == unknown */ + unsigned reserved[2]; /* must be zero for forward compatibility */ +} LZ4F_frameInfo_t; + +typedef struct { + LZ4F_frameInfo_t frameInfo; + int compressionLevel; /* 0 == default (fast mode); values above 16 count as 16; values below 0 count as 0 */ + unsigned autoFlush; /* 1 == always flush (reduce need for tmp buffer) */ + unsigned reserved[4]; /* must be zero for forward compatibility */ +} LZ4F_preferences_t; + + +/*********************************** +* Simple compression function +***********************************/ +size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr); + +size_t LZ4F_compressFrame(void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_preferences_t* preferencesPtr); +/* LZ4F_compressFrame() + * Compress an entire srcBuffer into a valid LZ4 frame, as defined by specification v1.5.1 + * The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. + * You can get the minimum value of dstMaxSize by using LZ4F_compressFrameBound() + * If this condition is not respected, LZ4F_compressFrame() will fail (result is an errorCode) + * The LZ4F_preferences_t structure is optional : you can provide NULL as argument. All preferences will be set to default. + * The result of the function is the number of bytes written into dstBuffer. + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + */ + + + +/********************************** +* Advanced compression functions +**********************************/ +typedef struct LZ4F_cctx_s* LZ4F_compressionContext_t; /* must be aligned on 8-bytes */ + +typedef struct { + unsigned stableSrc; /* 1 == src content will remain available on future calls to LZ4F_compress(); avoid saving src content within tmp buffer as future dictionary */ + unsigned reserved[3]; +} LZ4F_compressOptions_t; + +/* Resource Management */ + +#define LZ4F_VERSION 100 +LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* cctxPtr, unsigned version); +LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t cctx); +/* LZ4F_createCompressionContext() : + * The first thing to do is to create a compressionContext object, which will be used in all compression operations. + * This is achieved using LZ4F_createCompressionContext(), which takes as argument a version and an LZ4F_preferences_t structure. + * The version provided MUST be LZ4F_VERSION. It is intended to track potential version differences between different binaries. + * The function will provide a pointer to a fully allocated LZ4F_compressionContext_t object. + * If the result LZ4F_errorCode_t is not zero, there was an error during context creation. + * Object can release its memory using LZ4F_freeCompressionContext(); + */ + + +/* Compression */ + +size_t LZ4F_compressBegin(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_preferences_t* prefsPtr); +/* LZ4F_compressBegin() : + * will write the frame header into dstBuffer. + * dstBuffer must be large enough to accommodate a header (dstMaxSize). Maximum header size is 15 bytes. + * The LZ4F_preferences_t structure is optional : you can provide NULL as argument, all preferences will then be set to default. + * The result of the function is the number of bytes written into dstBuffer for the header + * or an error code (can be tested using LZ4F_isError()) + */ + +size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr); +/* LZ4F_compressBound() : + * Provides the minimum size of Dst buffer given srcSize to handle worst case situations. + * Different preferences can produce different results. + * prefsPtr is optional : you can provide NULL as argument, all preferences will then be set to cover worst case. + * This function includes frame termination cost (4 bytes, or 8 if frame checksum is enabled) + */ + +size_t LZ4F_compressUpdate(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* cOptPtr); +/* LZ4F_compressUpdate() + * LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary. + * The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. + * You can get the minimum value of dstMaxSize by using LZ4F_compressBound(). + * If this condition is not respected, LZ4F_compress() will fail (result is an errorCode). + * LZ4F_compressUpdate() doesn't guarantee error recovery, so you have to reset compression context when an error occurs. + * The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. + * The result of the function is the number of bytes written into dstBuffer : it can be zero, meaning input data was just buffered. + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + */ + +size_t LZ4F_flush(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr); +/* LZ4F_flush() + * Should you need to generate compressed data immediately, without waiting for the current block to be filled, + * you can call LZ4_flush(), which will immediately compress any remaining data buffered within cctx. + * Note that dstMaxSize must be large enough to ensure the operation will be successful. + * LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. + * The result of the function is the number of bytes written into dstBuffer + * (it can be zero, this means there was no data left within cctx) + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + */ + +size_t LZ4F_compressEnd(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr); +/* LZ4F_compressEnd() + * When you want to properly finish the compressed frame, just call LZ4F_compressEnd(). + * It will flush whatever data remained within compressionContext (like LZ4_flush()) + * but also properly finalize the frame, with an endMark and a checksum. + * The result of the function is the number of bytes written into dstBuffer (necessarily >= 4 (endMark), or 8 if optional frame checksum is enabled) + * The function outputs an error code if it fails (can be tested using LZ4F_isError()) + * The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. + * A successful call to LZ4F_compressEnd() makes cctx available again for next compression task. + */ + + +/*********************************** +* Decompression functions +***********************************/ + +typedef struct LZ4F_dctx_s* LZ4F_decompressionContext_t; /* must be aligned on 8-bytes */ + +typedef struct { + unsigned stableDst; /* guarantee that decompressed data will still be there on next function calls (avoid storage into tmp buffers) */ + unsigned reserved[3]; +} LZ4F_decompressOptions_t; + + +/* Resource management */ + +LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_decompressionContext_t* dctxPtr, unsigned version); +LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_decompressionContext_t dctx); +/* LZ4F_createDecompressionContext() : + * The first thing to do is to create an LZ4F_decompressionContext_t object, which will be used in all decompression operations. + * This is achieved using LZ4F_createDecompressionContext(). + * The version provided MUST be LZ4F_VERSION. It is intended to track potential breaking differences between different versions. + * The function will provide a pointer to a fully allocated and initialized LZ4F_decompressionContext_t object. + * The result is an errorCode, which can be tested using LZ4F_isError(). + * dctx memory can be released using LZ4F_freeDecompressionContext(); + * The result of LZ4F_freeDecompressionContext() is indicative of the current state of decompressionContext when being released. + * That is, it should be == 0 if decompression has been completed fully and correctly. + */ + + +/* Decompression */ + +size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t dctx, + LZ4F_frameInfo_t* frameInfoPtr, + const void* srcBuffer, size_t* srcSizePtr); +/* LZ4F_getFrameInfo() + * This function decodes frame header information (such as max blockSize, frame checksum, etc.). + * Its usage is optional. The objective is to extract frame header information, typically for allocation purposes. + * A header size is variable and can be from 7 to 15 bytes. It's also possible to input more bytes than that. + * The number of bytes read from srcBuffer will be updated within *srcSizePtr (necessarily <= original value). + * (note that LZ4F_getFrameInfo() can also be used anytime *after* starting decompression, in this case 0 input byte is enough) + * Frame header info is *copied into* an already allocated LZ4F_frameInfo_t structure. + * The function result is an hint about how many srcSize bytes LZ4F_decompress() expects for next call, + * or an error code which can be tested using LZ4F_isError() + * (typically, when there is not enough src bytes to fully decode the frame header) + * Decompression is expected to resume from where it stopped (srcBuffer + *srcSizePtr) + */ + +size_t LZ4F_decompress(LZ4F_decompressionContext_t dctx, + void* dstBuffer, size_t* dstSizePtr, + const void* srcBuffer, size_t* srcSizePtr, + const LZ4F_decompressOptions_t* dOptPtr); +/* LZ4F_decompress() + * Call this function repetitively to regenerate data compressed within srcBuffer. + * The function will attempt to decode *srcSizePtr bytes from srcBuffer, into dstBuffer of maximum size *dstSizePtr. + * + * The number of bytes regenerated into dstBuffer will be provided within *dstSizePtr (necessarily <= original value). + * + * The number of bytes read from srcBuffer will be provided within *srcSizePtr (necessarily <= original value). + * If number of bytes read is < number of bytes provided, then decompression operation is not completed. + * It typically happens when dstBuffer is not large enough to contain all decoded data. + * LZ4F_decompress() must be called again, starting from where it stopped (srcBuffer + *srcSizePtr) + * The function will check this condition, and refuse to continue if it is not respected. + * + * dstBuffer is supposed to be flushed between each call to the function, since its content will be overwritten. + * dst arguments can be changed at will with each consecutive call to the function. + * + * The function result is an hint of how many srcSize bytes LZ4F_decompress() expects for next call. + * Schematically, it's the size of the current (or remaining) compressed block + header of next block. + * Respecting the hint provides some boost to performance, since it does skip intermediate buffers. + * This is just a hint, you can always provide any srcSize you want. + * When a frame is fully decoded, the function result will be 0 (no more data expected). + * If decompression failed, function result is an error code, which can be tested using LZ4F_isError(). + * + * After a frame is fully decoded, dctx can be used again to decompress another frame. + */ + + +#if defined (__cplusplus) +} +#endif |