AuroraMiddleware/zstd
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Increase windowLog from CDict based on the srcSize when known

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This commit is contained in:
Nick Terrell 2018-01-11 14:35:04 -08:00
parent 04c00f9388
commit b610b777d3
1 changed files with 9 additions and 0 deletions
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9
lib/compress/zstd_compress.c
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@ -2453,6 +2453,15 @@ size_t ZSTD_compressBegin_usingCDict_advanced(
if (cdict==NULL) return ERROR(dictionary_wrong);
{ ZSTD_CCtx_params params = cctx->requestedParams;
params.cParams = ZSTD_getCParamsFromCDict(cdict);
/* Increase window log to fit the entire dictionary and source if the
* source size is known. Limit the increase to 19, which is the
* window log for compression level 1 with the largest source size.
*/
if (pledgedSrcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
U32 const limitedSrcSize = (U32)MIN(pledgedSrcSize, 1U << 19);
U32 const limitedSrcLog = limitedSrcSize > 1 ? ZSTD_highbit32(limitedSrcSize - 1) + 1 : 1;
params.cParams.windowLog = MAX(params.cParams.windowLog, limitedSrcLog);
}
params.fParams = fParams;
return ZSTD_compressBegin_internal(cctx,
NULL, 0, ZSTD_dm_auto,