Cross Reference: /external/chromium_org/third_party/libwebp/utils/bit

Lines Matching refs:br
23 void VP8InitBitReader(VP8BitReader* const br,
25   assert(br != NULL);
28   br->range_   = 255 - 1;
29   br->buf_     = start;
30   br->buf_end_ = end;
31   br->value_   = 0;
32   br->bits_    = -8;   // to load the very first 8bits
33   br->eof_     = 0;
34   VP8LoadNewBytes(br);
37 void VP8RemapBitReader(VP8BitReader* const br, ptrdiff_t offset) {
38   if (br->buf_ != NULL) {
39     br->buf_ += offset;
40     br->buf_end_ += offset;
76 void VP8LoadFinalBytes(VP8BitReader* const br) {
77   assert(br != NULL && br->buf_ != NULL);
79   if (br->buf_ < br->buf_end_) {
80     br->bits_ += 8;
81     br->value_ = (bit_t)(*br->buf_++) | (br->value_ << 8);
82   } else if (!br->eof_) {
83     br->value_ <<= 8;
84     br->bits_ += 8;
85     br->eof_ = 1;
92 uint32_t VP8GetValue(VP8BitReader* const br, int bits) {
95     v |= VP8GetBit(br, 0x80) << bits;
100 int32_t VP8GetSignedValue(VP8BitReader* const br, int bits) {
101   const int value = VP8GetValue(br, bits);
102   return VP8Get(br) ? -value : value;
129 void VP8LInitBitReader(VP8LBitReader* const br, const uint8_t* const start,
133   assert(br != NULL);
137   br->len_ = length;
138   br->val_ = 0;
139   br->bit_pos_ = 0;
140   br->eos_ = 0;
141   br->error_ = 0;
143   if (length > sizeof(br->val_)) {
144     length = sizeof(br->val_);
149   br->val_ = value;
150   br->pos_ = length;
151   br->buf_ = start;
154 // Special version that assumes br->pos_ <= br_len_.
155 static int IsEndOfStreamSpecial(const VP8LBitReader* const br) {
156   assert(br->pos_ <= br->len_);
157   return br->pos_ == br->len_ && br->bit_pos_ >= LBITS;
160 static int IsEndOfStream(const VP8LBitReader* const br) {
161   return (br->pos_ > br->len_) || IsEndOfStreamSpecial(br);
164 void VP8LBitReaderSetBuffer(VP8LBitReader* const br,
166   assert(br != NULL);
169   br->buf_ = buf;
170   br->len_ = len;
171   br->eos_ = IsEndOfStream(br);
175 static void ShiftBytes(VP8LBitReader* const br) {
176   while (br->bit_pos_ >= 8 && br->pos_ < br->len_) {
177     br->val_ >>= 8;
178     br->val_ |= ((vp8l_val_t)br->buf_[br->pos_]) << (LBITS - 8);
179     ++br->pos_;
180     br->bit_pos_ -= 8;
184 void VP8LFillBitWindow(VP8LBitReader* const br) {
185   if (br->bit_pos_ >= WBITS) {
189     if (br->pos_ + sizeof(br->val_) < br->len_) {
190       br->val_ >>= WBITS;
191       br->bit_pos_ -= WBITS;
194       br->val_ |= (vp8l_val_t)*(const uint32_t*)(br->buf_ + br->pos_) <<
196       br->pos_ += LOG8_WBITS;
200     ShiftBytes(br);       // Slow path.
201     br->eos_ = IsEndOfStreamSpecial(br);
205 uint32_t VP8LReadBits(VP8LBitReader* const br, int n_bits) {
208   if (!br->eos_ && n_bits <= VP8L_MAX_NUM_BIT_READ) {
210         (uint32_t)(br->val_ >> br->bit_pos_) & kBitMask[n_bits];
211     const int new_bits = br->bit_pos_ + n_bits;
212     br->bit_pos_ = new_bits;
214     br->eos_ = IsEndOfStreamSpecial(br);
215     ShiftBytes(br);
218     br->error_ = 1;