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support multithreading for linked blocks with dictionary

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This commit is contained in:
Yann Collet 2024-07-09 00:41:16 +02:00
parent b3dd37f78f
commit e36fadfd44
1 changed files with 9 additions and 23 deletions
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32
programs/lz4io.c
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@ -1129,24 +1129,17 @@ static size_t LZ4IO_compressFrameChunk(const void* params,
END_PROCESS(51, "unable to create a LZ4F compression context");
}
/* init state, and writes frame header, will be overwritten at next stage. */
{ size_t const whr = LZ4F_compressBegin_usingCDict(cctx, dst, dstCapacity, cfcp->cdict, cfcp->prefs);
if (LZ4F_isError(whr))
END_PROCESS(52, "error initializing LZ4F compression context");
}
/* let's populate compression tables with Prefix */
if (prefixSize) {
size_t pSize;
assert(cfcp->prefs->frameInfo.blockMode == LZ4F_blockLinked);
size_t const whr = LZ4F_compressBegin_usingDict(cctx, dst, dstCapacity, (const char*)src - prefixSize, prefixSize, cfcp->prefs);
if (LZ4F_isError(whr))
END_PROCESS(52, "error initializing LZ4F compression context with prefix");
assert(prefixSize == 64 KB);
assert(srcSize >= prefixSize);
pSize = LZ4F_compressUpdate(cctx, dst, dstCapacity, (const char*)src - prefixSize, prefixSize, NULL);
if (LZ4F_isError(pSize))
END_PROCESS(53, "error compressing prefix");
pSize = LZ4F_flush(cctx, dst, dstCapacity, NULL);
if (LZ4F_isError(pSize))
END_PROCESS(54, "error flushing prefix");
} else {
size_t const whr = LZ4F_compressBegin_usingCDict(cctx, dst, dstCapacity, cfcp->cdict, cfcp->prefs);
if (LZ4F_isError(whr))
END_PROCESS(53, "error initializing LZ4F compression context");
}
/* let's overwrite */
/* let's now compress, overwriting unused header */
{ size_t const cSize = LZ4F_compressUpdate(cctx, dst, dstCapacity, src, srcSize, NULL);
if (LZ4F_isError(cSize))
END_PROCESS(55, "error compressing with LZ4F_compressUpdate");
@ -1501,17 +1494,10 @@ LZ4IO_compressFilename_extRess(unsigned long long* inStreamSize,
int compressionLevel,
const LZ4IO_prefs_t* const io_prefs)
{
#if LZ4IO_MULTITHREAD
/* only employ multi-threading in the following scenarios: */
if ( (io_prefs->nbWorkers > 1)
&& ( (io_prefs->blockIndependence == LZ4F_blockIndependent) /* blocks must be independent */
|| (!io_prefs->useDictionary) )
)
if (LZ4IO_MULTITHREAD)
return LZ4IO_compressFilename_extRess_MT(inStreamSize, ress, srcFileName, dstFileName, compressionLevel, io_prefs);
#endif
/* Only single-thread available */
return LZ4IO_compressFilename_extRess_ST(inStreamSize, ress, srcFileName, dstFileName, compressionLevel, io_prefs);
}
int LZ4IO_compressFilename(const char* srcFileName, const char* dstFileName, int compressionLevel, const LZ4IO_prefs_t* prefs)