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Diffstat (limited to 'vendor/github.com/DataDog/zstd/zstd_v07.h')
| -rw-r--r-- | vendor/github.com/DataDog/zstd/zstd_v07.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/vendor/github.com/DataDog/zstd/zstd_v07.h b/vendor/github.com/DataDog/zstd/zstd_v07.h new file mode 100644 index 000000000..a566c1d10 --- /dev/null +++ b/vendor/github.com/DataDog/zstd/zstd_v07.h @@ -0,0 +1,187 @@ +/* + * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef ZSTDv07_H_235446 +#define ZSTDv07_H_235446 + +#if defined (__cplusplus) +extern "C" { +#endif + +/*====== Dependency ======*/ +#include <stddef.h> /* size_t */ + + +/*====== Export for Windows ======*/ +/*! +* ZSTDv07_DLL_EXPORT : +* Enable exporting of functions when building a Windows DLL +*/ +#if defined(_WIN32) && defined(ZSTDv07_DLL_EXPORT) && (ZSTDv07_DLL_EXPORT==1) +# define ZSTDLIBv07_API __declspec(dllexport) +#else +# define ZSTDLIBv07_API +#endif + + +/* ************************************* +* Simple API +***************************************/ +/*! ZSTDv07_getDecompressedSize() : +* @return : decompressed size if known, 0 otherwise. + note 1 : if `0`, follow up with ZSTDv07_getFrameParams() to know precise failure cause. + note 2 : decompressed size could be wrong or intentionally modified ! + always ensure results fit within application's authorized limits */ +unsigned long long ZSTDv07_getDecompressedSize(const void* src, size_t srcSize); + +/*! ZSTDv07_decompress() : + `compressedSize` : must be _exact_ size of compressed input, otherwise decompression will fail. + `dstCapacity` must be equal or larger than originalSize. + @return : the number of bytes decompressed into `dst` (<= `dstCapacity`), + or an errorCode if it fails (which can be tested using ZSTDv07_isError()) */ +ZSTDLIBv07_API size_t ZSTDv07_decompress( void* dst, size_t dstCapacity, + const void* src, size_t compressedSize); + +/** +ZSTDv07_findFrameSizeInfoLegacy() : get the source length and decompressed bound of a ZSTD frame compliant with v0.7.x format + srcSize : The size of the 'src' buffer, at least as large as the frame pointed to by 'src' + cSize (output parameter) : the number of bytes that would be read to decompress this frame + or an error code if it fails (which can be tested using ZSTDv01_isError()) + dBound (output parameter) : an upper-bound for the decompressed size of the data in the frame + or ZSTD_CONTENTSIZE_ERROR if an error occurs + + note : assumes `cSize` and `dBound` are _not_ NULL. +*/ +void ZSTDv07_findFrameSizeInfoLegacy(const void *src, size_t srcSize, + size_t* cSize, unsigned long long* dBound); + +/*====== Helper functions ======*/ +ZSTDLIBv07_API unsigned ZSTDv07_isError(size_t code); /*!< tells if a `size_t` function result is an error code */ +ZSTDLIBv07_API const char* ZSTDv07_getErrorName(size_t code); /*!< provides readable string from an error code */ + + +/*-************************************* +* Explicit memory management +***************************************/ +/** Decompression context */ +typedef struct ZSTDv07_DCtx_s ZSTDv07_DCtx; +ZSTDLIBv07_API ZSTDv07_DCtx* ZSTDv07_createDCtx(void); +ZSTDLIBv07_API size_t ZSTDv07_freeDCtx(ZSTDv07_DCtx* dctx); /*!< @return : errorCode */ + +/** ZSTDv07_decompressDCtx() : +* Same as ZSTDv07_decompress(), requires an allocated ZSTDv07_DCtx (see ZSTDv07_createDCtx()) */ +ZSTDLIBv07_API size_t ZSTDv07_decompressDCtx(ZSTDv07_DCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); + + +/*-************************ +* Simple dictionary API +***************************/ +/*! ZSTDv07_decompress_usingDict() : +* Decompression using a pre-defined Dictionary content (see dictBuilder). +* Dictionary must be identical to the one used during compression. +* Note : This function load the dictionary, resulting in a significant startup time */ +ZSTDLIBv07_API size_t ZSTDv07_decompress_usingDict(ZSTDv07_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const void* dict,size_t dictSize); + + +/*-************************** +* Advanced Dictionary API +****************************/ +/*! ZSTDv07_createDDict() : +* Create a digested dictionary, ready to start decompression operation without startup delay. +* `dict` can be released after creation */ +typedef struct ZSTDv07_DDict_s ZSTDv07_DDict; +ZSTDLIBv07_API ZSTDv07_DDict* ZSTDv07_createDDict(const void* dict, size_t dictSize); +ZSTDLIBv07_API size_t ZSTDv07_freeDDict(ZSTDv07_DDict* ddict); + +/*! ZSTDv07_decompress_usingDDict() : +* Decompression using a pre-digested Dictionary +* Faster startup than ZSTDv07_decompress_usingDict(), recommended when same dictionary is used multiple times. */ +ZSTDLIBv07_API size_t ZSTDv07_decompress_usingDDict(ZSTDv07_DCtx* dctx, + void* dst, size_t dstCapacity, + const void* src, size_t srcSize, + const ZSTDv07_DDict* ddict); + +typedef struct { + unsigned long long frameContentSize; + unsigned windowSize; + unsigned dictID; + unsigned checksumFlag; +} ZSTDv07_frameParams; + +ZSTDLIBv07_API size_t ZSTDv07_getFrameParams(ZSTDv07_frameParams* fparamsPtr, const void* src, size_t srcSize); /**< doesn't consume input */ + + + + +/* ************************************* +* Streaming functions +***************************************/ +typedef struct ZBUFFv07_DCtx_s ZBUFFv07_DCtx; +ZSTDLIBv07_API ZBUFFv07_DCtx* ZBUFFv07_createDCtx(void); +ZSTDLIBv07_API size_t ZBUFFv07_freeDCtx(ZBUFFv07_DCtx* dctx); + +ZSTDLIBv07_API size_t ZBUFFv07_decompressInit(ZBUFFv07_DCtx* dctx); +ZSTDLIBv07_API size_t ZBUFFv07_decompressInitDictionary(ZBUFFv07_DCtx* dctx, const void* dict, size_t dictSize); + +ZSTDLIBv07_API size_t ZBUFFv07_decompressContinue(ZBUFFv07_DCtx* dctx, + void* dst, size_t* dstCapacityPtr, + const void* src, size_t* srcSizePtr); + +/*-*************************************************************************** +* Streaming decompression howto +* +* A ZBUFFv07_DCtx object is required to track streaming operations. +* Use ZBUFFv07_createDCtx() and ZBUFFv07_freeDCtx() to create/release resources. +* Use ZBUFFv07_decompressInit() to start a new decompression operation, +* or ZBUFFv07_decompressInitDictionary() if decompression requires a dictionary. +* Note that ZBUFFv07_DCtx objects can be re-init multiple times. +* +* Use ZBUFFv07_decompressContinue() repetitively to consume your input. +* *srcSizePtr and *dstCapacityPtr can be any size. +* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. +* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again. +* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change `dst`. +* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to help latency), +* or 0 when a frame is completely decoded, +* or an error code, which can be tested using ZBUFFv07_isError(). +* +* Hint : recommended buffer sizes (not compulsory) : ZBUFFv07_recommendedDInSize() and ZBUFFv07_recommendedDOutSize() +* output : ZBUFFv07_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded. +* input : ZBUFFv07_recommendedDInSize == 128KB + 3; +* just follow indications from ZBUFFv07_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 . +* *******************************************************************************/ + + +/* ************************************* +* Tool functions +***************************************/ +ZSTDLIBv07_API unsigned ZBUFFv07_isError(size_t errorCode); +ZSTDLIBv07_API const char* ZBUFFv07_getErrorName(size_t errorCode); + +/** Functions below provide recommended buffer sizes for Compression or Decompression operations. +* These sizes are just hints, they tend to offer better latency */ +ZSTDLIBv07_API size_t ZBUFFv07_recommendedDInSize(void); +ZSTDLIBv07_API size_t ZBUFFv07_recommendedDOutSize(void); + + +/*-************************************* +* Constants +***************************************/ +#define ZSTDv07_MAGICNUMBER 0xFD2FB527 /* v0.7 */ + + +#if defined (__cplusplus) +} +#endif + +#endif /* ZSTDv07_H_235446 */ |