ddidderr/zstd-rs
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minor refactoring

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This commit is contained in:
Yann Collet
2016-03-15 01:33:36 +01:00
parent d1b26849e5
commit 1c2c2bcaff
2 changed files with 21 additions and 21 deletions
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lib/zstd_compress.c
+5 -4
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@@ -2205,19 +2205,20 @@ size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* zc,
/* Write Frame Header into ctx headerBuffer */
MEM_writeLE32(zc->headerBuffer, ZSTD_MAGICNUMBER);
{
BYTE* const op = (BYTE*)zc->headerBuffer;
U32 const fcsSize[4] = { 0, 1, 2, 8 };
U32 const fcsId = (params.srcSize>0) + (params.srcSize>=256) + (params.srcSize>=65536+256); /* 0-3 */
BYTE fdescriptor = (BYTE)(params.windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN); /* windowLog : 4 KB - 128 MB */
fdescriptor |= (BYTE)((params.searchLength==3)<<4); /* mml : 3-4 */
fdescriptor |= (BYTE)(fcsId << 6);
((BYTE*)zc->headerBuffer)[4] = fdescriptor;
op[4] = fdescriptor;
switch(fcsId)
{
default: /* impossible */
case 0 : break;
case 1 : ((BYTE*)zc->headerBuffer)[5] = (BYTE)(params.srcSize); break;
case 2 : MEM_writeLE16(((BYTE*)zc->headerBuffer)+5, (U16)(params.srcSize-256)); break;
case 3 : MEM_writeLE64(((BYTE*)zc->headerBuffer)+5, (U64)(params.srcSize)); break;
case 1 : op[5] = (BYTE)(params.srcSize); break;
case 2 : MEM_writeLE16(op+5, (U16)(params.srcSize-256)); break;
case 3 : MEM_writeLE64(op+5, (U64)(params.srcSize)); break;
}
zc->hbSize = ZSTD_frameHeaderSize_min + fcsSize[fcsId];
}