函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:lib\lz4\lz4hc_compress.c Create Date:2022-07-27 07:58:38
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/* dictionary saving */
 
int LZ4_saveDictHC(
    LZ4_streamHC_t *LZ4_streamHCPtr,
    char *safeBuffer,
    int dictSize)
{
    LZ4HC_CCtx_internal *const streamPtr = &LZ4_streamHCPtr->internal_donotuse;
    int const prefixSize = (int)(streamPtr->end
        - (streamPtr->base + streamPtr->dictLimit));
 
    if (dictSize > 64 * KB)
        dictSize = 64 * KB;
    if (dictSize < 4)
        dictSize = 0;
    if (dictSize > prefixSize)
        dictSize = prefixSize;
 
    memmove(safeBuffer, streamPtr->end - dictSize, dictSize);
 
    {
        U32 const endIndex = (U32)(streamPtr->end - streamPtr->base);
 
        streamPtr->end = (const BYTE *)safeBuffer + dictSize;
        streamPtr->base = streamPtr->end - endIndex;
        streamPtr->dictLimit = endIndex - dictSize;
        streamPtr->lowLimit = endIndex - dictSize;
 
        if (streamPtr->nextToUpdate < streamPtr->dictLimit)
            streamPtr->nextToUpdate = streamPtr->dictLimit;
    }
    return dictSize;
}