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minor variation - DSpeed at 640

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This commit is contained in:
Yann Collet
2016-03-23 01:32:41 +01:00
parent be391438ff
commit add08d6f61
5 changed files with 58 additions and 92 deletions
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lib/bitstream.h
+3 -4
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@@ -246,8 +246,7 @@ MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC)
/*! BIT_initDStream() :
* Initialize a BIT_DStream_t.
* `bitD` : a pointer to an already allocated BIT_DStream_t structure.
* `srcBuffer` must point at the beginning of a bitStream.
* `srcSize` must be the exact size of the bitStream, in bytes.
* `srcSize` must be the *exact* size of the bitStream, in bytes.
* @return : size of stream (== srcSize) or an errorCode if a problem is detected
*/
MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize)
@@ -293,7 +292,7 @@ MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, si
* On 64-bits, maxNbBits==56.
* @return : value extracted
*/
MEM_STATIC size_t BIT_lookBits(BIT_DStream_t* bitD, U32 nbBits)
MEM_STATIC size_t BIT_lookBits(const BIT_DStream_t* bitD, U32 nbBits)
{
U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1;
return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask);
@@ -301,7 +300,7 @@ MEM_STATIC size_t BIT_lookBits(BIT_DStream_t* bitD, U32 nbBits)
/*! BIT_lookBitsFast() :
* unsafe version; only works only if nbBits >= 1 */
MEM_STATIC size_t BIT_lookBitsFast(BIT_DStream_t* bitD, U32 nbBits)
MEM_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t* bitD, U32 nbBits)
{
U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1;
return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask);