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Add a fallback in case the total blocksize of split blocks exceeds raw block size

dev
Sen Huang 2021-03-22 14:38:21 -07:00
parent c90e81a692
commit 0ef1f935b7
1 changed files with 9 additions and 0 deletions
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9
lib/compress/zstd_compress.c
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@ -3327,6 +3327,7 @@ static size_t ZSTD_compressBlock_splitBlock_internal(ZSTD_CCtx* zc, void* dst, s
seqStore_t nextSeqStore;
seqStore_t currSeqStore;
U32 canEmitRLEorNoCompress = 1;
const size_t dstCapacityInitial = dstCapacity;
DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal (dstCapacity=%u, dictLimit=%u, nextToUpdate=%u)",
(unsigned)dstCapacity, (unsigned)zc->blockState.matchState.window.dictLimit,
@ -3370,6 +3371,14 @@ static size_t ZSTD_compressBlock_splitBlock_internal(ZSTD_CCtx* zc, void* dst, s
cSize += cSizeChunk;
currSeqStore = nextSeqStore;
}
if (cSize > ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize) {
/* If too large, recompress the original block to avoid any chance of a single block exceeding ZSTD_BLOCKSIZE_MAX */
cSize = ZSTD_compressSequences_singleBlock(zc, &zc->seqStore, (BYTE*)dst, dstCapacityInitial, (const BYTE*)src, blockSize, lastBlock, 1);
FORWARD_IF_ERROR(cSize, "Compressing single block from splitBlock_internal() fallback failed!");
DEBUGLOG(5, "ZSTD_compressBlock_splitBlock_internal: Compressed split block too large, recompressed");
}
assert(cSize <= ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize);
return cSize;
}