118 ZSTD_STATIC size_t BIT_initDStream(BIT_DStream_t *bitD, const void *srcBuffer, size_t srcSize);
119 ZSTD_STATIC size_t BIT_readBits(BIT_DStream_t *bitD, unsigned nbBits);
120 ZSTD_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t *bitD);
121 ZSTD_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t *bitD);
142 ZSTD_STATIC size_t BIT_readBitsFast(BIT_DStream_t *bitD, unsigned nbBits);
239 ZSTD_STATIC size_t BIT_initDStream(BIT_DStream_t *bitD, const void *srcBuffer, size_t srcSize)  in BIT_initDStream()  argument
242 		memset(bitD, 0, sizeof(*bitD));  in BIT_initDStream()
246 	if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */  in BIT_initDStream()
247 		bitD->start = (const char *)srcBuffer;  in BIT_initDStream()
248 		bitD->ptr = (const char *)srcBuffer + srcSize - sizeof(bitD->bitContainer);  in BIT_initDStream()
249 		bitD->bitContainer = ZSTD_readLEST(bitD->ptr);  in BIT_initDStream()
252 …bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; /* ensures bitsConsumed is always…  in BIT_initDStream()
257 		bitD->start = (const char *)srcBuffer;  in BIT_initDStream()
258 		bitD->ptr = bitD->start;  in BIT_initDStream()
259 		bitD->bitContainer = *(const BYTE *)(bitD->start);  in BIT_initDStream()
261 …case 7: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[6]) << (sizeof(bitD->bitContain…  in BIT_initDStream()
263 …case 6: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[5]) << (sizeof(bitD->bitContain…  in BIT_initDStream()
265 …case 5: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[4]) << (sizeof(bitD->bitContain…  in BIT_initDStream()
267 		case 4: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[3]) << 24;  in BIT_initDStream()
269 		case 3: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[2]) << 16;  in BIT_initDStream()
271 		case 2: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[1]) << 8;  in BIT_initDStream()
276 			bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0;  in BIT_initDStream()
280 		bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize) * 8;  in BIT_initDStream()
299 ZSTD_STATIC size_t BIT_lookBits(const BIT_DStream_t *bitD, U32 nbBits)  in BIT_lookBits()  argument
301 	U32 const bitMask = sizeof(bitD->bitContainer) * 8 - 1;  in BIT_lookBits()
302 …return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask - nbBits) & bitM…  in BIT_lookBits()
307 ZSTD_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t *bitD, U32 nbBits)  in BIT_lookBitsFast()  argument
309 	U32 const bitMask = sizeof(bitD->bitContainer) * 8 - 1;  in BIT_lookBitsFast()
310 …return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask + 1) - nbBits) & bitMa…  in BIT_lookBitsFast()
313 ZSTD_STATIC void BIT_skipBits(BIT_DStream_t *bitD, U32 nbBits) { bitD->bitsConsumed += nbBits; }  in BIT_skipBits()  argument
320 ZSTD_STATIC size_t BIT_readBits(BIT_DStream_t *bitD, U32 nbBits)  in BIT_readBits()  argument
322 	size_t const value = BIT_lookBits(bitD, nbBits);  in BIT_readBits()
323 	BIT_skipBits(bitD, nbBits);  in BIT_readBits()
329 ZSTD_STATIC size_t BIT_readBitsFast(BIT_DStream_t *bitD, U32 nbBits)  in BIT_readBitsFast()  argument
331 	size_t const value = BIT_lookBitsFast(bitD, nbBits);  in BIT_readBitsFast()
332 	BIT_skipBits(bitD, nbBits);  in BIT_readBitsFast()
341 ZSTD_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t *bitD)  in BIT_reloadDStream()  argument
343 …if (bitD->bitsConsumed > (sizeof(bitD->bitContainer) * 8)) /* should not happen => corruption dete…  in BIT_reloadDStream()
346 	if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) {  in BIT_reloadDStream()
347 		bitD->ptr -= bitD->bitsConsumed >> 3;  in BIT_reloadDStream()
348 		bitD->bitsConsumed &= 7;  in BIT_reloadDStream()
349 		bitD->bitContainer = ZSTD_readLEST(bitD->ptr);  in BIT_reloadDStream()
352 	if (bitD->ptr == bitD->start) {  in BIT_reloadDStream()
353 		if (bitD->bitsConsumed < sizeof(bitD->bitContainer) * 8)  in BIT_reloadDStream()
358 		U32 nbBytes = bitD->bitsConsumed >> 3;  in BIT_reloadDStream()
360 		if (bitD->ptr - nbBytes < bitD->start) {  in BIT_reloadDStream()
361 			nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */  in BIT_reloadDStream()
364 		bitD->ptr -= nbBytes;  in BIT_reloadDStream()
365 		bitD->bitsConsumed -= nbBytes * 8;  in BIT_reloadDStream()
366 		bitD->bitContainer = ZSTD_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */  in BIT_reloadDStream()