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update specification and comments

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This commit is contained in:
Yann Collet
2016-07-01 20:55:28 +02:00
parent 406dcca98a
commit 2fa9904844
4 changed files with 200 additions and 94 deletions
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20
lib/decompress/zstd_decompress.c
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@@ -207,20 +207,8 @@ void ZSTD_copyDCtx(ZSTD_DCtx* dstDCtx, const ZSTD_DCtx* srcDCtx)
*/
/* Frame descriptor
/* Frame Header :
// old
1 byte - Alloc :
bit 0-3 : windowLog - ZSTD_WINDOWLOG_ABSOLUTEMIN (see zstd_internal.h)
bit 4 : reserved for windowLog (must be zero)
bit 5 : reserved (must be zero)
bit 6-7 : Frame content size : unknown, 1 byte, 2 bytes, 8 bytes
1 byte - checker :
bit 0-1 : dictID (0, 1, 2 or 4 bytes)
bit 2-7 : reserved (must be zero)
// new
1 byte - FrameHeaderDescription :
bit 0-1 : dictID (0, 1, 2 or 4 bytes)
bit 2 : checksumFlag
@@ -454,16 +442,14 @@ size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
const void* src, size_t srcSize) /* note : srcSize < BLOCKSIZE */
{
const BYTE* const istart = (const BYTE*) src;
litBlockType_t lbt;
if (srcSize < MIN_CBLOCK_SIZE) return ERROR(corruption_detected);
lbt = (litBlockType_t)(istart[0]>> 6);
switch(lbt)
switch((litBlockType_t)(istart[0]>> 6))
{
case lbt_huffman:
{ size_t litSize, litCSize, singleStream=0;
U32 lhSize = ((istart[0]) >> 4) & 3;
U32 lhSize = (istart[0] >> 4) & 3;
if (srcSize < 5) return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for lhSize, + cSize (+nbSeq) */
switch(lhSize)
{