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conservatively estimate over-splitting in presence of incompressible loss

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ensure data can never be expanded by more than 3 bytes per full block.
This commit is contained in:
Yann Collet
2024-10-22 15:25:45 -07:00
parent 5ae34e4c96
commit ea85dc7af6
1 changed files with 1 additions and 0 deletions
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lib/compress/zstd_compress.c
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@ -4587,6 +4587,7 @@ static size_t ZSTD_compress_frameChunk(ZSTD_CCtx* cctx,
} /* if (ZSTD_useTargetCBlockSize(&cctx->appliedParams))*/ } /* if (ZSTD_useTargetCBlockSize(&cctx->appliedParams))*/
if (cSize < blockSize) savings += (blockSize - cSize); if (cSize < blockSize) savings += (blockSize - cSize);
else if (savings) savings--;
ip += blockSize; ip += blockSize;
assert(remaining >= blockSize); assert(remaining >= blockSize);
remaining -= blockSize; remaining -= blockSize;