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The thread header CRC computation was broken for LZW/1.
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parent
104f34629c
commit
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@ -648,10 +648,9 @@ Nu_CompressLZW(NuArchive* pArchive, NuStraw* pStraw, FILE* fp,
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/*
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/*
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* Compute the CRC. For LZW/1 this is on the entire 4K block, for
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* Compute the CRC. For LZW/1 this is on the entire 4K block, for
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* the "version 3" thread CRC this is on just the "real" data.
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* the "version 3" thread header CRC this is on just the "real" data.
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*/
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*/
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*pThreadCrc = Nu_CalcCRC16(*pThreadCrc,
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*pThreadCrc = Nu_CalcCRC16(*pThreadCrc, lzwState->inputBuf, blockSize);
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lzwState->inputBuf, blockSize);
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if (!isType2) {
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if (!isType2) {
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lzwState->chunkCrc = Nu_CalcCRC16(lzwState->chunkCrc,
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lzwState->chunkCrc = Nu_CalcCRC16(lzwState->chunkCrc,
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lzwState->inputBuf, kNuLZWBlockSize);
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lzwState->inputBuf, kNuLZWBlockSize);
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@ -1514,15 +1513,10 @@ Nu_ExpandLZW(NuArchive* pArchive, const NuRecord* pRecord,
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* See commentary in the compression code for why we have to
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* See commentary in the compression code for why we have to
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* compute two CRCs for LZW/1.
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* compute two CRCs for LZW/1.
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*/
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*/
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if (isType2) {
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if (pThreadCrc != nil) {
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if (pThreadCrc != nil) {
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*pThreadCrc = Nu_CalcCRC16(*pThreadCrc, writeBuf, writeLen);
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*pThreadCrc = Nu_CalcCRC16(*pThreadCrc, writeBuf, writeLen);
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}
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}
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if (!isType2) {
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} else {
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if (pThreadCrc != nil) {
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*pThreadCrc = Nu_CalcCRC16(*pThreadCrc, writeBuf,
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kNuLZWBlockSize);
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}
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lzwState->chunkCrc = Nu_CalcCRC16(lzwState->chunkCrc,
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lzwState->chunkCrc = Nu_CalcCRC16(lzwState->chunkCrc,
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writeBuf, kNuLZWBlockSize);
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writeBuf, kNuLZWBlockSize);
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}
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}
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