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Fix #4553 #4555

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Merged
Cyan4973 merged 1 commit into from
Dec 19, 2025
+9 −2
Merged

Fix #4553 #4555

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11 changes: 9 additions & 2 deletions lib/legacy/zstd_v05.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3972,8 +3972,15 @@ size_t ZBUFFv05_decompressContinue(ZBUFFv05_DCtx* zbc, void* dst, size_t* maxDst
zbc->outStart += flushedSize;
if (flushedSize == toFlushSize) {
zbc->stage = ZBUFFv05ds_read;
if (zbc->outStart + BLOCKSIZE > zbc->outBuffSize)
zbc->outStart = zbc->outEnd = 0;
if (zbc->outStart + BLOCKSIZE > zbc->outBuffSize) {
/* Not enough room for next block - need to wrap buffer.
* Preserve history: copy the last windowSize bytes to the
* beginning so that back-references can still find valid data. */
size_t const windowSize = (size_t)1 << zbc->params.windowLog;
size_t const preserveSize = MIN(zbc->outEnd, windowSize);
memmove(zbc->outBuff, zbc->outBuff + zbc->outEnd - preserveSize, preserveSize);
zbc->outStart = zbc->outEnd = preserveSize;
}
break;
}
/* cannot flush everything */
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