diff options
Diffstat (limited to 'src/main/jni/libwebp/utils/bit_reader.c')
| -rw-r--r-- | src/main/jni/libwebp/utils/bit_reader.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/src/main/jni/libwebp/utils/bit_reader.c b/src/main/jni/libwebp/utils/bit_reader.c deleted file mode 100644 index 64503e6b9..000000000 --- a/src/main/jni/libwebp/utils/bit_reader.c +++ /dev/null @@ -1,210 +0,0 @@ -// Copyright 2010 Google Inc. All Rights Reserved. -// -// Use of this source code is governed by a BSD-style license -// that can be found in the COPYING file in the root of the source -// tree. An additional intellectual property rights grant can be found -// in the file PATENTS. All contributing project authors may -// be found in the AUTHORS file in the root of the source tree. -// ----------------------------------------------------------------------------- -// -// Boolean decoder non-inlined methods -// -// Author: Skal (pascal.massimino@gmail.com) - -#ifdef HAVE_CONFIG_H -#include "../webp/config.h" -#endif - -#include "./bit_reader_inl.h" - -//------------------------------------------------------------------------------ -// VP8BitReader - -void VP8InitBitReader(VP8BitReader* const br, - const uint8_t* const start, const uint8_t* const end) { - assert(br != NULL); - assert(start != NULL); - assert(start <= end); - br->range_ = 255 - 1; - br->buf_ = start; - br->buf_end_ = end; - br->value_ = 0; - br->bits_ = -8; // to load the very first 8bits - br->eof_ = 0; - VP8LoadNewBytes(br); -} - -void VP8RemapBitReader(VP8BitReader* const br, ptrdiff_t offset) { - if (br->buf_ != NULL) { - br->buf_ += offset; - br->buf_end_ += offset; - } -} - -const uint8_t kVP8Log2Range[128] = { - 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 0 -}; - -// range = ((range - 1) << kVP8Log2Range[range]) + 1 -const range_t kVP8NewRange[128] = { - 127, 127, 191, 127, 159, 191, 223, 127, - 143, 159, 175, 191, 207, 223, 239, 127, - 135, 143, 151, 159, 167, 175, 183, 191, - 199, 207, 215, 223, 231, 239, 247, 127, - 131, 135, 139, 143, 147, 151, 155, 159, - 163, 167, 171, 175, 179, 183, 187, 191, - 195, 199, 203, 207, 211, 215, 219, 223, - 227, 231, 235, 239, 243, 247, 251, 127, - 129, 131, 133, 135, 137, 139, 141, 143, - 145, 147, 149, 151, 153, 155, 157, 159, - 161, 163, 165, 167, 169, 171, 173, 175, - 177, 179, 181, 183, 185, 187, 189, 191, - 193, 195, 197, 199, 201, 203, 205, 207, - 209, 211, 213, 215, 217, 219, 221, 223, - 225, 227, 229, 231, 233, 235, 237, 239, - 241, 243, 245, 247, 249, 251, 253, 127 -}; - -void VP8LoadFinalBytes(VP8BitReader* const br) { - assert(br != NULL && br->buf_ != NULL); - // Only read 8bits at a time - if (br->buf_ < br->buf_end_) { - br->bits_ += 8; - br->value_ = (bit_t)(*br->buf_++) | (br->value_ << 8); - } else if (!br->eof_) { - br->value_ <<= 8; - br->bits_ += 8; - br->eof_ = 1; - } -} - -//------------------------------------------------------------------------------ -// Higher-level calls - -uint32_t VP8GetValue(VP8BitReader* const br, int bits) { - uint32_t v = 0; - while (bits-- > 0) { - v |= VP8GetBit(br, 0x80) << bits; - } - return v; -} - -int32_t VP8GetSignedValue(VP8BitReader* const br, int bits) { - const int value = VP8GetValue(br, bits); - return VP8Get(br) ? -value : value; -} - -//------------------------------------------------------------------------------ -// VP8LBitReader - -#define VP8L_LOG8_WBITS 4 // Number of bytes needed to store VP8L_WBITS bits. - -#if !defined(WEBP_FORCE_ALIGNED) && \ - (defined(__arm__) || defined(_M_ARM) || defined(__aarch64__) || \ - defined(__i386__) || defined(_M_IX86) || \ - defined(__x86_64__) || defined(_M_X64)) -#define VP8L_USE_UNALIGNED_LOAD -#endif - -static const uint32_t kBitMask[VP8L_MAX_NUM_BIT_READ + 1] = { - 0, - 0x000001, 0x000003, 0x000007, 0x00000f, - 0x00001f, 0x00003f, 0x00007f, 0x0000ff, - 0x0001ff, 0x0003ff, 0x0007ff, 0x000fff, - 0x001fff, 0x003fff, 0x007fff, 0x00ffff, - 0x01ffff, 0x03ffff, 0x07ffff, 0x0fffff, - 0x1fffff, 0x3fffff, 0x7fffff, 0xffffff -}; - -void VP8LInitBitReader(VP8LBitReader* const br, const uint8_t* const start, - size_t length) { - size_t i; - vp8l_val_t value = 0; - assert(br != NULL); - assert(start != NULL); - assert(length < 0xfffffff8u); // can't happen with a RIFF chunk. - - br->len_ = length; - br->val_ = 0; - br->bit_pos_ = 0; - br->eos_ = 0; - br->error_ = 0; - - if (length > sizeof(br->val_)) { - length = sizeof(br->val_); - } - for (i = 0; i < length; ++i) { - value |= (vp8l_val_t)start[i] << (8 * i); - } - br->val_ = value; - br->pos_ = length; - br->buf_ = start; -} - -void VP8LBitReaderSetBuffer(VP8LBitReader* const br, - const uint8_t* const buf, size_t len) { - assert(br != NULL); - assert(buf != NULL); - assert(len < 0xfffffff8u); // can't happen with a RIFF chunk. - br->buf_ = buf; - br->len_ = len; - // pos_ > len_ should be considered a param error. - br->error_ = (br->pos_ > br->len_); - br->eos_ = br->error_ || VP8LIsEndOfStream(br); -} - -// If not at EOS, reload up to VP8L_LBITS byte-by-byte -static void ShiftBytes(VP8LBitReader* const br) { - while (br->bit_pos_ >= 8 && br->pos_ < br->len_) { - br->val_ >>= 8; - br->val_ |= ((vp8l_val_t)br->buf_[br->pos_]) << (VP8L_LBITS - 8); - ++br->pos_; - br->bit_pos_ -= 8; - } - br->eos_ = VP8LIsEndOfStream(br); -} - -void VP8LDoFillBitWindow(VP8LBitReader* const br) { - assert(br->bit_pos_ >= VP8L_WBITS); - // TODO(jzern): given the fixed read size it may be possible to force - // alignment in this block. -#if defined(VP8L_USE_UNALIGNED_LOAD) - if (br->pos_ + sizeof(br->val_) < br->len_) { - br->val_ >>= VP8L_WBITS; - br->bit_pos_ -= VP8L_WBITS; - // The expression below needs a little-endian arch to work correctly. - // This gives a large speedup for decoding speed. - br->val_ |= (vp8l_val_t)*(const uint32_t*)(br->buf_ + br->pos_) << - (VP8L_LBITS - VP8L_WBITS); - br->pos_ += VP8L_LOG8_WBITS; - return; - } -#endif - ShiftBytes(br); // Slow path. -} - -uint32_t VP8LReadBits(VP8LBitReader* const br, int n_bits) { - assert(n_bits >= 0); - // Flag an error if end_of_stream or n_bits is more than allowed limit. - if (!br->eos_ && n_bits <= VP8L_MAX_NUM_BIT_READ) { - const uint32_t val = - (uint32_t)(br->val_ >> br->bit_pos_) & kBitMask[n_bits]; - const int new_bits = br->bit_pos_ + n_bits; - br->bit_pos_ = new_bits; - ShiftBytes(br); - return val; - } else { - br->error_ = 1; - return 0; - } -} - -//------------------------------------------------------------------------------ |