AuroraMiddleware/zstd
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added prototype ZSTD_decompressBegin_usingDDict (#700)

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This commit is contained in:
Yann Collet 2017-05-16 16:05:27 -07:00
parent 2d4d31c18a
commit 4eff8136aa
2 changed files with 10 additions and 8 deletions
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13
lib/decompress/zstd_decompress.c
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@ -177,8 +177,6 @@ void ZSTD_copyDCtx(ZSTD_DCtx* dstDCtx, const ZSTD_DCtx* srcDCtx)
memcpy(dstDCtx, srcDCtx, sizeof(ZSTD_DCtx) - workSpaceSize); /* no need to copy workspace */
}
static void ZSTD_refDDict(ZSTD_DCtx* dstDCtx, const ZSTD_DDict* ddict);
/*-*************************************************************
* Decompression section
@ -1540,7 +1538,7 @@ static size_t ZSTD_decompressMultiFrame(ZSTD_DCtx* dctx,
if (ddict) {
/* we were called from ZSTD_decompress_usingDDict */
ZSTD_refDDict(dctx, ddict);
CHECK_F(ZSTD_decompressBegin_usingDDict(dctx, ddict));
} else {
/* this will initialize correctly with no dict if dict == NULL, so
* use this in all cases but ddict */
@ -1862,10 +1860,10 @@ static size_t ZSTD_DDictDictSize(const ZSTD_DDict* ddict)
return ddict->dictSize;
}
static void ZSTD_refDDict(ZSTD_DCtx* dstDCtx, const ZSTD_DDict* ddict)
size_t ZSTD_decompressBegin_usingDDict(ZSTD_DCtx* dstDCtx, const ZSTD_DDict* ddict)
{
ZSTD_decompressBegin(dstDCtx); /* init */
if (ddict) { /* support refDDict on NULL */
CHECK_F(ZSTD_decompressBegin(dstDCtx));
if (ddict) { /* support begin on NULL */
dstDCtx->dictID = ddict->dictID;
dstDCtx->base = ddict->dictContent;
dstDCtx->vBase = ddict->dictContent;
@ -1886,6 +1884,7 @@ static void ZSTD_refDDict(ZSTD_DCtx* dstDCtx, const ZSTD_DDict* ddict)
dstDCtx->fseEntropy = 0;
}
}
return 0;
}
static size_t ZSTD_loadEntropy_inDDict(ZSTD_DDict* ddict)
@ -2271,7 +2270,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
} }
/* Consume header */
ZSTD_refDDict(zds->dctx, zds->ddict);
ZSTD_decompressBegin_usingDDict(zds->dctx, zds->ddict);
{ size_t const h1Size = ZSTD_nextSrcSizeToDecompress(zds->dctx); /* == ZSTD_frameHeaderSize_prefix */
CHECK_F(ZSTD_decompressContinue(zds->dctx, NULL, 0, zds->headerBuffer, h1Size));
{ size_t const h2Size = ZSTD_nextSrcSizeToDecompress(zds->dctx);

5
lib/zstd.h
View File

@ -710,7 +710,8 @@ ZSTDLIB_API size_t ZSTD_compressEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapaci
>0 : `srcSize` is too small, please provide at least @result bytes on next attempt.
errorCode, which can be tested using ZSTD_isError().
Start decompression, with ZSTD_decompressBegin() or ZSTD_decompressBegin_usingDict().
Start decompression, with ZSTD_decompressBegin().
If decompression requires a dictionary, use ZSTD_decompressBegin_usingDict() or ZSTD_decompressBegin_usingDDict().
Alternatively, you can copy a prepared context, using ZSTD_copyDCtx().
Then use ZSTD_nextSrcSizeToDecompress() and ZSTD_decompressContinue() alternatively.
@ -753,7 +754,9 @@ ZSTDLIB_API size_t ZSTD_compressEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapaci
ZSTDLIB_API size_t ZSTD_getFrameHeader(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize); /**< doesn't consume input, see details below */
ZSTDLIB_API size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx);
ZSTDLIB_API size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx* dctx, const void* dict, size_t dictSize);
ZSTDLIB_API size_t ZSTD_decompressBegin_usingDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict);
ZSTDLIB_API void ZSTD_copyDCtx(ZSTD_DCtx* dctx, const ZSTD_DCtx* preparedDCtx);
ZSTDLIB_API size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx);
ZSTDLIB_API size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
typedef enum { ZSTDnit_frameHeader, ZSTDnit_blockHeader, ZSTDnit_block, ZSTDnit_lastBlock, ZSTDnit_checksum, ZSTDnit_skippableFrame } ZSTD_nextInputType_e;