Convert all spaces to tabs
This commit is contained in:
Nick Terrell
@@ -10,9 +10,9 @@
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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@@ -73,11 +73,11 @@ extern "C" {
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*/
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typedef struct
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{
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size_t bitContainer;
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int bitPos;
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char* startPtr;
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char* ptr;
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char* endPtr;
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size_t bitContainer;
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int bitPos;
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char* startPtr;
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char* ptr;
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char* endPtr;
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} BIT_CStream_t;
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MEM_STATIC size_t BIT_initCStream(BIT_CStream_t* bitC, void* dstBuffer, size_t dstCapacity);
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@@ -108,17 +108,17 @@ MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC);
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**********************************************/
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typedef struct
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{
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size_t bitContainer;
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unsigned bitsConsumed;
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const char* ptr;
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const char* start;
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size_t bitContainer;
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unsigned bitsConsumed;
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const char* ptr;
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const char* start;
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} BIT_DStream_t;
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typedef enum { BIT_DStream_unfinished = 0,
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BIT_DStream_endOfBuffer = 1,
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BIT_DStream_completed = 2,
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BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */
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/* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */
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BIT_DStream_endOfBuffer = 1,
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BIT_DStream_completed = 2,
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BIT_DStream_overflow = 3 } BIT_DStream_status; /* result of BIT_reloadDStream() */
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/* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */
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MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize);
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MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits);
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@@ -157,20 +157,20 @@ MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, unsigned nbBits);
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MEM_STATIC unsigned BIT_highbit32 (register U32 val)
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{
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# if defined(_MSC_VER) /* Visual */
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unsigned long r=0;
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_BitScanReverse ( &r, val );
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return (unsigned) r;
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unsigned long r=0;
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_BitScanReverse ( &r, val );
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return (unsigned) r;
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# elif defined(__GNUC__) && (__GNUC__ >= 3) /* Use GCC Intrinsic */
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return 31 - __builtin_clz (val);
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return 31 - __builtin_clz (val);
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# else /* Software version */
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static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 };
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U32 v = val;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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return DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27];
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static const unsigned DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 };
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U32 v = val;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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return DeBruijnClz[ (U32) (v * 0x07C4ACDDU) >> 27];
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# endif
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}
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@@ -184,44 +184,44 @@ static const unsigned BIT_mask[] = { 0, 1, 3, 7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x
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/*! BIT_initCStream() :
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* `dstCapacity` must be > sizeof(void*)
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* @return : 0 if success,
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otherwise an error code (can be tested using ERR_isError() ) */
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otherwise an error code (can be tested using ERR_isError() ) */
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MEM_STATIC size_t BIT_initCStream(BIT_CStream_t* bitC, void* startPtr, size_t dstCapacity)
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{
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bitC->bitContainer = 0;
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bitC->bitPos = 0;
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bitC->startPtr = (char*)startPtr;
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bitC->ptr = bitC->startPtr;
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bitC->endPtr = bitC->startPtr + dstCapacity - sizeof(bitC->ptr);
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if (dstCapacity <= sizeof(bitC->ptr)) return ERROR(dstSize_tooSmall);
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return 0;
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bitC->bitContainer = 0;
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bitC->bitPos = 0;
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bitC->startPtr = (char*)startPtr;
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bitC->ptr = bitC->startPtr;
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bitC->endPtr = bitC->startPtr + dstCapacity - sizeof(bitC->ptr);
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if (dstCapacity <= sizeof(bitC->ptr)) return ERROR(dstSize_tooSmall);
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return 0;
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}
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/*! BIT_addBits() :
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can add up to 26 bits into `bitC`.
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Does not check for register overflow ! */
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can add up to 26 bits into `bitC`.
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Does not check for register overflow ! */
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MEM_STATIC void BIT_addBits(BIT_CStream_t* bitC, size_t value, unsigned nbBits)
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{
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bitC->bitContainer |= (value & BIT_mask[nbBits]) << bitC->bitPos;
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bitC->bitPos += nbBits;
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bitC->bitContainer |= (value & BIT_mask[nbBits]) << bitC->bitPos;
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bitC->bitPos += nbBits;
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}
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/*! BIT_addBitsFast() :
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* works only if `value` is _clean_, meaning all high bits above nbBits are 0 */
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MEM_STATIC void BIT_addBitsFast(BIT_CStream_t* bitC, size_t value, unsigned nbBits)
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{
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bitC->bitContainer |= value << bitC->bitPos;
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bitC->bitPos += nbBits;
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bitC->bitContainer |= value << bitC->bitPos;
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bitC->bitPos += nbBits;
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}
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/*! BIT_flushBitsFast() :
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* unsafe version; does not check buffer overflow */
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MEM_STATIC void BIT_flushBitsFast(BIT_CStream_t* bitC)
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{
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size_t const nbBytes = bitC->bitPos >> 3;
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MEM_writeLEST(bitC->ptr, bitC->bitContainer);
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bitC->ptr += nbBytes;
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bitC->bitPos &= 7;
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bitC->bitContainer >>= nbBytes*8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */
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size_t const nbBytes = bitC->bitPos >> 3;
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MEM_writeLEST(bitC->ptr, bitC->bitContainer);
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bitC->ptr += nbBytes;
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bitC->bitPos &= 7;
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bitC->bitContainer >>= nbBytes*8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */
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}
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/*! BIT_flushBits() :
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@@ -229,25 +229,25 @@ MEM_STATIC void BIT_flushBitsFast(BIT_CStream_t* bitC)
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* note : does not signal buffer overflow. This will be revealed later on using BIT_closeCStream() */
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MEM_STATIC void BIT_flushBits(BIT_CStream_t* bitC)
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{
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size_t const nbBytes = bitC->bitPos >> 3;
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MEM_writeLEST(bitC->ptr, bitC->bitContainer);
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bitC->ptr += nbBytes;
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if (bitC->ptr > bitC->endPtr) bitC->ptr = bitC->endPtr;
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bitC->bitPos &= 7;
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bitC->bitContainer >>= nbBytes*8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */
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size_t const nbBytes = bitC->bitPos >> 3;
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MEM_writeLEST(bitC->ptr, bitC->bitContainer);
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bitC->ptr += nbBytes;
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if (bitC->ptr > bitC->endPtr) bitC->ptr = bitC->endPtr;
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bitC->bitPos &= 7;
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bitC->bitContainer >>= nbBytes*8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */
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}
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/*! BIT_closeCStream() :
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* @return : size of CStream, in bytes,
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or 0 if it could not fit into dstBuffer */
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or 0 if it could not fit into dstBuffer */
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MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC)
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{
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BIT_addBitsFast(bitC, 1, 1); /* endMark */
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BIT_flushBits(bitC);
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BIT_addBitsFast(bitC, 1, 1); /* endMark */
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BIT_flushBits(bitC);
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if (bitC->ptr >= bitC->endPtr) return 0; /* doesn't fit within authorized budget : cancel */
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if (bitC->ptr >= bitC->endPtr) return 0; /* doesn't fit within authorized budget : cancel */
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return (bitC->ptr - bitC->startPtr) + (bitC->bitPos > 0);
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return (bitC->ptr - bitC->startPtr) + (bitC->bitPos > 0);
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}
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@@ -262,60 +262,60 @@ MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC)
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*/
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MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize)
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{
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if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); }
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if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); }
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if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */
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bitD->start = (const char*)srcBuffer;
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bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(bitD->bitContainer);
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bitD->bitContainer = MEM_readLEST(bitD->ptr);
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{ BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1];
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bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; /* ensures bitsConsumed is always set */
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if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ }
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} else {
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bitD->start = (const char*)srcBuffer;
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bitD->ptr = bitD->start;
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bitD->bitContainer = *(const BYTE*)(bitD->start);
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switch(srcSize)
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{
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case 7: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[6]) << (sizeof(bitD->bitContainer)*8 - 16);
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case 6: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[5]) << (sizeof(bitD->bitContainer)*8 - 24);
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case 5: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[4]) << (sizeof(bitD->bitContainer)*8 - 32);
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case 4: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[3]) << 24;
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case 3: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[2]) << 16;
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case 2: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[1]) << 8;
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default:;
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}
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{ BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1];
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bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0;
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if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ }
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bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize)*8;
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}
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if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */
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bitD->start = (const char*)srcBuffer;
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bitD->ptr = (const char*)srcBuffer + srcSize - sizeof(bitD->bitContainer);
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bitD->bitContainer = MEM_readLEST(bitD->ptr);
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{ BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1];
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bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; /* ensures bitsConsumed is always set */
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if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ }
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} else {
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bitD->start = (const char*)srcBuffer;
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bitD->ptr = bitD->start;
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bitD->bitContainer = *(const BYTE*)(bitD->start);
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switch(srcSize)
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{
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case 7: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[6]) << (sizeof(bitD->bitContainer)*8 - 16);
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case 6: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[5]) << (sizeof(bitD->bitContainer)*8 - 24);
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case 5: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[4]) << (sizeof(bitD->bitContainer)*8 - 32);
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case 4: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[3]) << 24;
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case 3: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[2]) << 16;
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case 2: bitD->bitContainer += (size_t)(((const BYTE*)(srcBuffer))[1]) << 8;
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default:;
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}
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{ BYTE const lastByte = ((const BYTE*)srcBuffer)[srcSize-1];
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bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0;
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if (lastByte == 0) return ERROR(GENERIC); /* endMark not present */ }
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bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize)*8;
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}
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return srcSize;
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return srcSize;
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}
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MEM_STATIC size_t BIT_getUpperBits(size_t bitContainer, U32 const start)
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{
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return bitContainer >> start;
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return bitContainer >> start;
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}
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MEM_STATIC size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 const nbBits)
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{
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#if defined(__BMI__) && defined(__GNUC__) && __GNUC__*1000+__GNUC_MINOR__ >= 4008 /* experimental */
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# if defined(__x86_64__)
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if (sizeof(bitContainer)==8)
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return _bextr_u64(bitContainer, start, nbBits);
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else
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if (sizeof(bitContainer)==8)
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return _bextr_u64(bitContainer, start, nbBits);
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else
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# endif
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return _bextr_u32(bitContainer, start, nbBits);
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return _bextr_u32(bitContainer, start, nbBits);
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#else
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return (bitContainer >> start) & BIT_mask[nbBits];
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return (bitContainer >> start) & BIT_mask[nbBits];
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#endif
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}
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MEM_STATIC size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits)
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{
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return bitContainer & BIT_mask[nbBits];
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return bitContainer & BIT_mask[nbBits];
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}
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/*! BIT_lookBits() :
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@@ -328,10 +328,10 @@ MEM_STATIC size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits)
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MEM_STATIC size_t BIT_lookBits(const BIT_DStream_t* bitD, U32 nbBits)
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{
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#if defined(__BMI__) && defined(__GNUC__) /* experimental; fails if bitD->bitsConsumed + nbBits > sizeof(bitD->bitContainer)*8 */
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return BIT_getMiddleBits(bitD->bitContainer, (sizeof(bitD->bitContainer)*8) - bitD->bitsConsumed - nbBits, nbBits);
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return BIT_getMiddleBits(bitD->bitContainer, (sizeof(bitD->bitContainer)*8) - bitD->bitsConsumed - nbBits, nbBits);
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#else
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U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1;
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return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask);
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U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1;
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return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask-nbBits) & bitMask);
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#endif
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}
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@@ -339,13 +339,13 @@ MEM_STATIC size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits)
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* unsafe version; only works only if nbBits >= 1 */
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MEM_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t* bitD, U32 nbBits)
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{
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U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1;
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return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask);
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U32 const bitMask = sizeof(bitD->bitContainer)*8 - 1;
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return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask+1)-nbBits) & bitMask);
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}
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MEM_STATIC void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits)
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{
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bitD->bitsConsumed += nbBits;
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bitD->bitsConsumed += nbBits;
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}
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/*! BIT_readBits() :
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@@ -355,51 +355,51 @@ MEM_STATIC void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits)
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*/
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MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, U32 nbBits)
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{
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size_t const value = BIT_lookBits(bitD, nbBits);
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BIT_skipBits(bitD, nbBits);
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return value;
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size_t const value = BIT_lookBits(bitD, nbBits);
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BIT_skipBits(bitD, nbBits);
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return value;
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}
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/*! BIT_readBitsFast() :
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* unsafe version; only works only if nbBits >= 1 */
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MEM_STATIC size_t BIT_readBitsFast(BIT_DStream_t* bitD, U32 nbBits)
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{
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size_t const value = BIT_lookBitsFast(bitD, nbBits);
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BIT_skipBits(bitD, nbBits);
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return value;
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size_t const value = BIT_lookBitsFast(bitD, nbBits);
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BIT_skipBits(bitD, nbBits);
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return value;
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}
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/*! BIT_reloadDStream() :
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* Refill `bitD` from buffer previously set in BIT_initDStream() .
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* This function is safe, it guarantees it will not read beyond src buffer.
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* @return : status of `BIT_DStream_t` internal register.
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if status == BIT_DStream_unfinished, internal register is filled with >= (sizeof(bitD->bitContainer)*8 - 7) bits */
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if status == BIT_DStream_unfinished, internal register is filled with >= (sizeof(bitD->bitContainer)*8 - 7) bits */
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MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD)
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{
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if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should not happen => corruption detected */
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return BIT_DStream_overflow;
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if (bitD->bitsConsumed > (sizeof(bitD->bitContainer)*8)) /* should not happen => corruption detected */
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return BIT_DStream_overflow;
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if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) {
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bitD->ptr -= bitD->bitsConsumed >> 3;
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bitD->bitsConsumed &= 7;
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bitD->bitContainer = MEM_readLEST(bitD->ptr);
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return BIT_DStream_unfinished;
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}
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if (bitD->ptr == bitD->start) {
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if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer;
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return BIT_DStream_completed;
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}
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{ U32 nbBytes = bitD->bitsConsumed >> 3;
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BIT_DStream_status result = BIT_DStream_unfinished;
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if (bitD->ptr - nbBytes < bitD->start) {
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nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */
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result = BIT_DStream_endOfBuffer;
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}
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bitD->ptr -= nbBytes;
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bitD->bitsConsumed -= nbBytes*8;
|
||||
bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */
|
||||
return result;
|
||||
}
|
||||
if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) {
|
||||
bitD->ptr -= bitD->bitsConsumed >> 3;
|
||||
bitD->bitsConsumed &= 7;
|
||||
bitD->bitContainer = MEM_readLEST(bitD->ptr);
|
||||
return BIT_DStream_unfinished;
|
||||
}
|
||||
if (bitD->ptr == bitD->start) {
|
||||
if (bitD->bitsConsumed < sizeof(bitD->bitContainer)*8) return BIT_DStream_endOfBuffer;
|
||||
return BIT_DStream_completed;
|
||||
}
|
||||
{ U32 nbBytes = bitD->bitsConsumed >> 3;
|
||||
BIT_DStream_status result = BIT_DStream_unfinished;
|
||||
if (bitD->ptr - nbBytes < bitD->start) {
|
||||
nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */
|
||||
result = BIT_DStream_endOfBuffer;
|
||||
}
|
||||
bitD->ptr -= nbBytes;
|
||||
bitD->bitsConsumed -= nbBytes*8;
|
||||
bitD->bitContainer = MEM_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
/*! BIT_endOfDStream() :
|
||||
@@ -407,7 +407,7 @@ MEM_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t* bitD)
|
||||
*/
|
||||
MEM_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t* DStream)
|
||||
{
|
||||
return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8));
|
||||
return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer)*8));
|
||||
}
|
||||
|
||||
#if defined (__cplusplus)
|
||||
|
||||
Reference in New Issue
Block a user