ddidderr/zstd-rs
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clarified frame parameters for ZSTD_compress*_usingCDict()

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created ZSTD_compressBegin_usingCDict_internal(),
which gives direct control to frame Parameters.
ZSTD_resetCStream_internal() now points into it.
This commit is contained in:
Yann Collet
2017-04-17 18:29:06 -07:00
parent 9c4c970399
commit 4f818182b8
6 changed files with 41 additions and 33 deletions
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lib/common/zstd_internal.h
+2
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@@ -58,6 +58,8 @@
/*-*************************************
* shared macros
***************************************/
#undef MIN
#undef MAX
#define MIN(a,b) ((a)<(b) ? (a) : (b))
#define MAX(a,b) ((a)>(b) ? (a) : (b))
#define CHECK_F(f) { size_t const errcod = f; if (ERR_isError(errcod)) return errcod; } /* check and Forward error code */
lib/compress/zstd_compress.c
+25 -16
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@@ -2911,36 +2911,45 @@ static ZSTD_parameters ZSTD_getParamsFromCDict(const ZSTD_CDict* cdict) {
return ZSTD_getParamsFromCCtx(cdict->refContext);
}
size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict, unsigned long long pledgedSrcSize)
/* ZSTD_compressBegin_usingCDict_internal() :
* cdict must be != NULL */
static size_t ZSTD_compressBegin_usingCDict_internal(
ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict,
ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize)
{
if (cdict==NULL) return ERROR(GENERIC); /* does not support NULL cdict */
if (cdict->dictContentSize) CHECK_F(ZSTD_copyCCtx(cctx, cdict->refContext, pledgedSrcSize))
if (cdict->dictContentSize)
CHECK_F(ZSTD_copyCCtx(cctx, cdict->refContext, pledgedSrcSize)) /* to be changed, to consider fParams */
else {
ZSTD_parameters params = cdict->refContext->params;
params.fParams.contentSizeFlag = (pledgedSrcSize > 0);
params.fParams = fParams;
CHECK_F(ZSTD_compressBegin_internal(cctx, NULL, 0, params, pledgedSrcSize));
}
return 0;
}
/* ZSTD_compressBegin_usingCDict() :
* pledgedSrcSize=0 means "unknown"
* if pledgedSrcSize>0, it will enable contentSizeFlag */
size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict, unsigned long long pledgedSrcSize)
{
ZSTD_frameParameters fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
fParams.contentSizeFlag = (pledgedSrcSize > 0);
return ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, pledgedSrcSize);
}
/*! ZSTD_compress_usingCDict() :
* Compression using a digested Dictionary.
* Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times.
* Note that compression level is decided during dictionary creation */
* Compression using a digested Dictionary.
* Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times.
* Note that compression parameters are decided at CDict creation time
* while frame parameters are hardcoded */
size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const ZSTD_CDict* cdict)
{
CHECK_F(ZSTD_compressBegin_usingCDict(cctx, cdict, srcSize)); /* will check if cdict != NULL */
if (cdict->refContext->params.fParams.contentSizeFlag == 1) {
cctx->params.fParams.contentSizeFlag = 1;
cctx->frameContentSize = srcSize;
} else {
cctx->params.fParams.contentSizeFlag = 0;
}
ZSTD_frameParameters const fParams = { 1 /*content*/, 0 /*checksum*/, 0 /*noDictID*/ };
CHECK_F (ZSTD_compressBegin_usingCDict_internal(cctx, cdict, fParams, srcSize)); /* will check if cdict != NULL */
return ZSTD_compressEnd(cctx, dst, dstCapacity, src, srcSize);
}
@@ -3022,7 +3031,7 @@ static size_t ZSTD_resetCStream_internal(ZSTD_CStream* zcs, unsigned long long p
{
if (zcs->inBuffSize==0) return ERROR(stage_wrong); /* zcs has not been init at least once => can't reset */
if (zcs->cdict) CHECK_F(ZSTD_compressBegin_usingCDict(zcs->cctx, zcs->cdict, pledgedSrcSize))
if (zcs->cdict) CHECK_F(ZSTD_compressBegin_usingCDict_internal(zcs->cctx, zcs->cdict, zcs->params.fParams, pledgedSrcSize))
else CHECK_F(ZSTD_compressBegin_internal(zcs->cctx, NULL, 0, zcs->params, pledgedSrcSize));
zcs->inToCompress = 0;
lib/zstd.h
+4 -3
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@@ -194,9 +194,10 @@ ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict(const void* dictBuffer, size_t dictSize
ZSTDLIB_API size_t ZSTD_freeCDict(ZSTD_CDict* CDict);
/*! ZSTD_compress_usingCDict() :
* Compression using a digested Dictionary.
* Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times.
* Note that compression level is decided during dictionary creation. */
* Compression using a digested Dictionary.
* Faster startup than ZSTD_compress_usingDict(), recommended when same dictionary is used multiple times.
* Note that compression level is decided during dictionary creation.
* Frame parameters are hardcoded (dictID=yes, contentSize=yes, checksum=no) */
ZSTDLIB_API size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,