Bug 1309440 - Remove unused BitBuffer methods from RiceDeltaDecoder.cpp. r=francois

MozReview-Commit-ID: GOzgd7eKILm

--HG--
extra : rebase_source : a02732b893c024d930da3e6d08521d9f35e12a88
This commit is contained in:
Cykesiopka 2016-10-12 10:51:31 +08:00
Родитель 3befba8d87
Коммит 3d68090896
1 изменённых файлов: 0 добавлений и 81 удалений

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@ -25,19 +25,9 @@ class BitBuffer {
public:
BitBuffer(const uint8_t* bytes, size_t byte_count);
// Gets the current offset, in bytes/bits, from the start of the buffer. The
// bit offset is the offset into the current byte, in the range [0,7].
void GetCurrentOffset(size_t* out_byte_offset, size_t* out_bit_offset);
// The remaining bits in the byte buffer.
uint64_t RemainingBitCount() const;
// Reads byte-sized values from the buffer. Returns false if there isn't
// enough data left for the specified type.
bool ReadUInt8(uint8_t* val);
bool ReadUInt16(uint16_t* val);
bool ReadUInt32(uint32_t* val);
// Reads bit-sized values from the buffer. Returns false if there isn't enough
// data left for the specified bit count..
bool ReadBits(uint32_t* val, size_t bit_count);
@ -56,22 +46,11 @@ class BitBuffer {
// Returns false if there isn't enough data left for the specified type, or if
// the value wouldn't fit in a uint32_t.
bool ReadExponentialGolomb(uint32_t* val);
// Reads signed exponential golomb values at the current offset. Signed
// exponential golomb values are just the unsigned values mapped to the
// sequence 0, 1, -1, 2, -2, etc. in order.
bool ReadSignedExponentialGolomb(int32_t* val);
// Moves current position |byte_count| bytes forward. Returns false if
// there aren't enough bytes left in the buffer.
bool ConsumeBytes(size_t byte_count);
// Moves current position |bit_count| bits forward. Returns false if
// there aren't enough bits left in the buffer.
bool ConsumeBits(size_t bit_count);
// Sets the current offset to the provied byte/bit offsets. The bit
// offset is from the given byte, in the range [0,7].
bool Seek(size_t byte_offset, size_t bit_offset);
protected:
const uint8_t* const bytes_;
// The total size of |bytes_|.
@ -180,30 +159,6 @@ uint64_t BitBuffer::RemainingBitCount() const {
return (static_cast<uint64_t>(byte_count_) - byte_offset_) * 8 - bit_offset_;
}
bool BitBuffer::ReadUInt8(uint8_t* val) {
uint32_t bit_val;
if (!ReadBits(&bit_val, sizeof(uint8_t) * 8)) {
return false;
}
MOZ_ASSERT(bit_val <= std::numeric_limits<uint8_t>::max());
*val = static_cast<uint8_t>(bit_val);
return true;
}
bool BitBuffer::ReadUInt16(uint16_t* val) {
uint32_t bit_val;
if (!ReadBits(&bit_val, sizeof(uint16_t) * 8)) {
return false;
}
MOZ_ASSERT(bit_val <= std::numeric_limits<uint16_t>::max());
*val = static_cast<uint16_t>(bit_val);
return true;
}
bool BitBuffer::ReadUInt32(uint32_t* val) {
return ReadBits(val, sizeof(uint32_t) * 8);
}
bool BitBuffer::PeekBits(uint32_t* val, size_t bit_count) {
if (!val || bit_count > RemainingBitCount() || bit_count > 32) {
return false;
@ -238,10 +193,6 @@ bool BitBuffer::ReadBits(uint32_t* val, size_t bit_count) {
return PeekBits(val, bit_count) && ConsumeBits(bit_count);
}
bool BitBuffer::ConsumeBytes(size_t byte_count) {
return ConsumeBits(byte_count * 8);
}
bool BitBuffer::ConsumeBits(size_t bit_count) {
if (bit_count > RemainingBitCount()) {
return false;
@ -273,36 +224,4 @@ bool BitBuffer::ReadExponentialGolomb(uint32_t* val) {
*val = one_bit_count;
return true;
}
bool BitBuffer::ReadSignedExponentialGolomb(int32_t* val) {
uint32_t unsigned_val;
if (!ReadExponentialGolomb(&unsigned_val)) {
return false;
}
if ((unsigned_val & 1) == 0) {
*val = -static_cast<int32_t>(unsigned_val / 2);
} else {
*val = (unsigned_val + 1) / 2;
}
return true;
}
void BitBuffer::GetCurrentOffset(
size_t* out_byte_offset, size_t* out_bit_offset) {
MOZ_ASSERT(out_byte_offset != NULL);
MOZ_ASSERT(out_bit_offset != NULL);
*out_byte_offset = byte_offset_;
*out_bit_offset = bit_offset_;
}
bool BitBuffer::Seek(size_t byte_offset, size_t bit_offset) {
if (byte_offset > byte_count_ || bit_offset > 7 ||
(byte_offset == byte_count_ && bit_offset > 0)) {
return false;
}
byte_offset_ = byte_offset;
bit_offset_ = bit_offset;
return true;
}
}