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ZSTD_compressBlock() limits block size depending on windowLog parameter

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This commit is contained in:
Yann Collet
2016-07-15 11:58:49 +02:00
parent 227cc39e15
commit 961b6a0e34
3 changed files with 11 additions and 9 deletions
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lib/compress/zstd_compress.c
+6 -5
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@@ -274,9 +274,9 @@ size_t ZSTD_estimateCCtxSize(ZSTD_compressionParameters cParams)
note : 'params' is expected to be validated */
static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
ZSTD_parameters params, U64 frameContentSize,
U32 reset, U32 fullBlockSize)
U32 reset)
{ /* note : params considered validated here */
const size_t blockSize = fullBlockSize ? ZSTD_BLOCKSIZE_MAX : MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << params.cParams.windowLog);
const size_t blockSize = MIN(ZSTD_BLOCKSIZE_MAX, (size_t)1 << params.cParams.windowLog);
const U32 divider = (params.cParams.searchLength==3) ? 3 : 4;
const size_t maxNbSeq = blockSize / divider;
const size_t tokenSpace = blockSize + 11*maxNbSeq;
@@ -358,7 +358,7 @@ size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx)
if (srcCCtx->stage!=1) return ERROR(stage_wrong);
memcpy(&dstCCtx->customMem, &srcCCtx->customMem, sizeof(ZSTD_customMem));
ZSTD_resetCCtx_advanced(dstCCtx, srcCCtx->params, srcCCtx->frameContentSize, 0, 1);
ZSTD_resetCCtx_advanced(dstCCtx, srcCCtx->params, srcCCtx->frameContentSize, 0);
dstCCtx->params.fParams.contentSizeFlag = 0; /* content size different from the one set during srcCCtx init */
/* copy tables */
@@ -2560,7 +2560,8 @@ size_t ZSTD_compressContinue (ZSTD_CCtx* zc,
size_t ZSTD_compressBlock(ZSTD_CCtx* zc, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
{
if (srcSize > ZSTD_BLOCKSIZE_MAX) return ERROR(srcSize_wrong);
size_t const blockSizeMax = MIN (ZSTD_BLOCKSIZE_MAX, 1 << zc->params.cParams.windowLog);
if (srcSize > blockSizeMax) return ERROR(srcSize_wrong);
ZSTD_LOG_BLOCK("%p: ZSTD_compressBlock searchLength=%d\n", zc->base, zc->params.cParams.searchLength);
return ZSTD_compressContinue_internal(zc, dst, dstCapacity, src, srcSize, 0);
}
@@ -2695,7 +2696,7 @@ static size_t ZSTD_compressBegin_internal(ZSTD_CCtx* zc,
const void* dict, size_t dictSize,
ZSTD_parameters params, U64 pledgedSrcSize)
{
size_t const resetError = ZSTD_resetCCtx_advanced(zc, params, pledgedSrcSize, 1, (pledgedSrcSize==0) );
size_t const resetError = ZSTD_resetCCtx_advanced(zc, params, pledgedSrcSize, 1);
if (ZSTD_isError(resetError)) return resetError;
return ZSTD_compress_insertDictionary(zc, dict, dictSize);