88 ZSTD_STATIC size_t BIT_initDStream(BIT_DStream_t *bitD, const void *srcBuffer, size_t srcSize);
89 ZSTD_STATIC size_t BIT_readBits(BIT_DStream_t *bitD, unsigned nbBits);
90 ZSTD_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t *bitD);
91 ZSTD_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t *bitD);
112 ZSTD_STATIC size_t BIT_readBitsFast(BIT_DStream_t *bitD, unsigned nbBits);
209 ZSTD_STATIC size_t BIT_initDStream(BIT_DStream_t *bitD, const void *srcBuffer, size_t srcSize)  in BIT_initDStream()  argument
212 		memset(bitD, 0, sizeof(*bitD));  in BIT_initDStream()
216 	if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */  in BIT_initDStream()
217 		bitD->start = (const char *)srcBuffer;  in BIT_initDStream()
218 		bitD->ptr = (const char *)srcBuffer + srcSize - sizeof(bitD->bitContainer);  in BIT_initDStream()
219 		bitD->bitContainer = ZSTD_readLEST(bitD->ptr);  in BIT_initDStream()
222 …bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; /* ensures bitsConsumed is always…  in BIT_initDStream()
227 		bitD->start = (const char *)srcBuffer;  in BIT_initDStream()
228 		bitD->ptr = bitD->start;  in BIT_initDStream()
229 		bitD->bitContainer = *(const BYTE *)(bitD->start);  in BIT_initDStream()
231 …case 7: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[6]) << (sizeof(bitD->bitContain…  in BIT_initDStream()
232 …case 6: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[5]) << (sizeof(bitD->bitContain…  in BIT_initDStream()
233 …case 5: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[4]) << (sizeof(bitD->bitContain…  in BIT_initDStream()
234 		case 4: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[3]) << 24;  in BIT_initDStream()
235 		case 3: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[2]) << 16;  in BIT_initDStream()
236 		case 2: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[1]) << 8;  in BIT_initDStream()
241 			bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0;  in BIT_initDStream()
245 		bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize) * 8;  in BIT_initDStream()
264 ZSTD_STATIC size_t BIT_lookBits(const BIT_DStream_t *bitD, U32 nbBits)  in BIT_lookBits()  argument
266 	U32 const bitMask = sizeof(bitD->bitContainer) * 8 - 1;  in BIT_lookBits()
267 …return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask - nbBits) & bitM…  in BIT_lookBits()
272 ZSTD_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t *bitD, U32 nbBits)  in BIT_lookBitsFast()  argument
274 	U32 const bitMask = sizeof(bitD->bitContainer) * 8 - 1;  in BIT_lookBitsFast()
275 …return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask + 1) - nbBits) & bitMa…  in BIT_lookBitsFast()
278 ZSTD_STATIC void BIT_skipBits(BIT_DStream_t *bitD, U32 nbBits) { bitD->bitsConsumed += nbBits; }  in BIT_skipBits()  argument
285 ZSTD_STATIC size_t BIT_readBits(BIT_DStream_t *bitD, U32 nbBits)  in BIT_readBits()  argument
287 	size_t const value = BIT_lookBits(bitD, nbBits);  in BIT_readBits()
288 	BIT_skipBits(bitD, nbBits);  in BIT_readBits()
294 ZSTD_STATIC size_t BIT_readBitsFast(BIT_DStream_t *bitD, U32 nbBits)  in BIT_readBitsFast()  argument
296 	size_t const value = BIT_lookBitsFast(bitD, nbBits);  in BIT_readBitsFast()
297 	BIT_skipBits(bitD, nbBits);  in BIT_readBitsFast()
306 ZSTD_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t *bitD)  in BIT_reloadDStream()  argument
308 …if (bitD->bitsConsumed > (sizeof(bitD->bitContainer) * 8)) /* should not happen => corruption dete…  in BIT_reloadDStream()
311 	if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) {  in BIT_reloadDStream()
312 		bitD->ptr -= bitD->bitsConsumed >> 3;  in BIT_reloadDStream()
313 		bitD->bitsConsumed &= 7;  in BIT_reloadDStream()
314 		bitD->bitContainer = ZSTD_readLEST(bitD->ptr);  in BIT_reloadDStream()
317 	if (bitD->ptr == bitD->start) {  in BIT_reloadDStream()
318 		if (bitD->bitsConsumed < sizeof(bitD->bitContainer) * 8)  in BIT_reloadDStream()
323 		U32 nbBytes = bitD->bitsConsumed >> 3;  in BIT_reloadDStream()
325 		if (bitD->ptr - nbBytes < bitD->start) {  in BIT_reloadDStream()
326 			nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */  in BIT_reloadDStream()
329 		bitD->ptr -= nbBytes;  in BIT_reloadDStream()
330 		bitD->bitsConsumed -= nbBytes * 8;  in BIT_reloadDStream()
331 		bitD->bitContainer = ZSTD_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */  in BIT_reloadDStream()