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reinforced fix for huge files

dev
Yann Collet 2016-08-25 22:24:59 +02:00
parent bb93d77ab8
commit 5a02b69215
1 changed files with 4 additions and 1 deletions
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5
lib/compress/zstd_compress.c
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@ -2248,6 +2248,7 @@ static size_t ZSTD_compressBlock_internal(ZSTD_CCtx* zc, void* dst, size_t dstCa
* Frame is supposed already started (header already produced)
* @return : compressed size, or an error code
*/
#include <stdio.h>
static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
@ -2274,8 +2275,10 @@ static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
if (cctx->lowLimit > (1<<30)) {
U32 const btplus = (cctx->params.cParams.strategy == ZSTD_btlazy2) | (cctx->params.cParams.strategy == ZSTD_btopt);
U32 const chainMask = (1 << (cctx->params.cParams.chainLog - btplus)) - 1;
U32 const newLowLimit = (cctx->lowLimit & chainMask) + (chainMask+1); /* preserve position % chainSize, ensure current-repcode doesn't underflow */
U32 const supLog = MAX(cctx->params.cParams.chainLog, 17 /* blockSize */);
U32 const newLowLimit = (cctx->lowLimit & chainMask) + (1 << supLog); /* preserve position % chainSize, ensure current-repcode doesn't underflow */
U32 const correction = cctx->lowLimit - newLowLimit;
fprintf(stderr, "chainMask : %u \n", chainMask);
ZSTD_reduceIndex(cctx, correction);
cctx->base += correction;
cctx->dictBase += correction;