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setParameter : no side-effect on setting a compression parameter

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last such side-effect was modifying cctx->loadedDictEnd on setting forceWindow.
It is no a useless operation, so it's removed.
No side-effect left when setting a compression parameter.
This commit is contained in:
Yann Collet
2017-12-01 21:17:09 -08:00
parent 6fc63f521f
commit 5e1f34b7e4
2 changed files with 5 additions and 34 deletions
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lib/compress/zstd_compress.c
+4 -33
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@@ -270,9 +270,8 @@ size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, unsigned v
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
case ZSTD_p_forceMaxWindow : /* Force back-references to remain < windowSize,
* even when referencing into Dictionary content
* even when referencing into Dictionary content.
* default : 0 when using a CDict, 1 when using a Prefix */
cctx->loadedDictEnd = 0; /* ? */
return ZSTD_CCtxParam_setParameter(&cctx->requestedParams, param, value);
case ZSTD_p_nbThreads:
@@ -461,13 +460,9 @@ size_t ZSTD_CCtxParam_setParameter(
}
}
/**
* This function should be updated whenever ZSTD_CCtx_params is updated.
* Parameters are copied manually before the dictionary is loaded.
* The multithreading parameters jobSize and overlapSizeLog are set only if
* nbThreads > 1.
*
* pledgedSrcSize is considered unknown
/** ZSTD_CCtx_setParametersUsingCCtxParams() :
* just applies `params` into `cctx`
* no action is performed, parameters are merely stored.
*/
size_t ZSTD_CCtx_setParametersUsingCCtxParams(
ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params)
@@ -475,31 +470,8 @@ size_t ZSTD_CCtx_setParametersUsingCCtxParams(
if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
if (cctx->cdict) return ERROR(stage_wrong);
#if 1
cctx->requestedParams = *params;
#else
/* Assume the compression and frame parameters are validated */
cctx->requestedParams.cParams = params->cParams;
cctx->requestedParams.fParams = params->fParams;
cctx->requestedParams.compressionLevel = params->compressionLevel;
/* Set force window explicitly since it sets cctx->loadedDictEnd */
CHECK_F( ZSTD_CCtx_setParameter(
cctx, ZSTD_p_forceMaxWindow, params->forceWindow) );
/* Set multithreading parameters explicitly */
CHECK_F( ZSTD_CCtx_setParameter(cctx, ZSTD_p_nbThreads, params->nbThreads) );
if (params->nbThreads > 1) {
CHECK_F( ZSTD_CCtx_setParameter(cctx, ZSTD_p_jobSize, params->jobSize) );
CHECK_F( ZSTD_CCtx_setParameter(
cctx, ZSTD_p_overlapSizeLog, params->overlapSizeLog) );
}
/* Copy long distance matching parameters */
cctx->requestedParams.ldmParams = params->ldmParams;
#endif
/* customMem is used only for create/free params and can be ignored */
return 0;
}
@@ -2097,7 +2069,6 @@ size_t ZSTD_compressBegin_advanced_internal(
unsigned long long pledgedSrcSize)
{
DEBUGLOG(4, "ZSTD_compressBegin_advanced_internal");
DEBUGLOG(4, "contentSizeFlag : %u", params.fParams.contentSizeFlag);
/* compression parameters verification and optimization */
CHECK_F( ZSTD_checkCParams(params.cParams) );
return ZSTD_compressBegin_internal(cctx, dict, dictSize, dictMode, NULL,