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added ZSTD_CCtx_reset

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This commit is contained in:
Yann Collet 2017-06-16 10:17:50 -07:00
parent cc9f9b7f4c
commit bd18c885a3
2 changed files with 12 additions and 4 deletions
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11
lib/compress/zstd_compress.c
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@ -399,14 +399,14 @@ ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, s
} }
/* Not ready yet ! */ /* Not ready yet ! */
ZSTDLIB_API size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize) size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
{ {
(void)cctx; (void)prefix; (void)prefixSize; /* to be done later */ (void)cctx; (void)prefix; (void)prefixSize; /* to be done later */
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong); if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
return ERROR(compressionParameter_unsupported); return ERROR(compressionParameter_unsupported);
} }
ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict) size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
{ {
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong); if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
cctx->cdict = cdict; cctx->cdict = cdict;
@ -414,6 +414,13 @@ ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
} }
void ZSTD_CCtx_reset(ZSTD_CCtx* cctx)
{
cctx->streamStage = zcss_init;
cctx->frameContentSize = ZSTD_CONTENTSIZE_UNKNOWN;
cctx->cdict = NULL;
}
/** ZSTD_checkParams() : /** ZSTD_checkParams() :
ensure param values remain within authorized range. ensure param values remain within authorized range.
@return : 0, or an error code if one value is beyond authorized range */ @return : 0, or an error code if one value is beyond authorized range */

5
lib/zstd.h
View File

@ -819,10 +819,11 @@ ZSTDLIB_API size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
/*! ZSTD_CCtx_reset() : /*! ZSTD_CCtx_reset() :
* Return a CCtx to clean state. * Return a CCtx to clean state.
* Useful after an error, or to interrupt an ongoing compression job and start a new one. * Useful after an error, or to interrupt an ongoing compression job and start a new one.
* It's possible to modify compression parameters after a reset.
* Any internal data not yet flushed is cancelled. * Any internal data not yet flushed is cancelled.
* Dictionary (if any) is dropped, next compression starts with srcSize==unknown by default.
* It's possible to modify compression parameters after a reset.
*/ */
ZSTDLIB_API size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx); /* Not ready yet ! */ ZSTDLIB_API void ZSTD_CCtx_reset(ZSTD_CCtx* cctx); /* Not ready yet ! */
/*! ZSTD_compress_generic_simpleArgs() : /*! ZSTD_compress_generic_simpleArgs() :