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extern/gltf-draco/draco/src/draco/core/decoder_buffer.cc
- This file was added.
| // Copyright 2016 The Draco Authors. | |||||
| // | |||||
| // Licensed under the Apache License, Version 2.0 (the "License"); | |||||
| // you may not use this file except in compliance with the License. | |||||
| // You may obtain a copy of the License at | |||||
| // | |||||
| // http://www.apache.org/licenses/LICENSE-2.0 | |||||
| // | |||||
| // Unless required by applicable law or agreed to in writing, software | |||||
| // distributed under the License is distributed on an "AS IS" BASIS, | |||||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |||||
| // See the License for the specific language governing permissions and | |||||
| // limitations under the License. | |||||
| // | |||||
| #include "draco/core/decoder_buffer.h" | |||||
| #include "draco/core/macros.h" | |||||
| #include "draco/core/varint_decoding.h" | |||||
| namespace draco { | |||||
| DecoderBuffer::DecoderBuffer() | |||||
| : data_(nullptr), | |||||
| data_size_(0), | |||||
| pos_(0), | |||||
| bit_mode_(false), | |||||
| bitstream_version_(0) {} | |||||
| void DecoderBuffer::Init(const char *data, size_t data_size) { | |||||
| Init(data, data_size, bitstream_version_); | |||||
| } | |||||
| void DecoderBuffer::Init(const char *data, size_t data_size, uint16_t version) { | |||||
| data_ = data; | |||||
| data_size_ = data_size; | |||||
| bitstream_version_ = version; | |||||
| pos_ = 0; | |||||
| } | |||||
| bool DecoderBuffer::StartBitDecoding(bool decode_size, uint64_t *out_size) { | |||||
| if (decode_size) { | |||||
| #ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED | |||||
| if (bitstream_version_ < DRACO_BITSTREAM_VERSION(2, 2)) { | |||||
| if (!Decode(out_size)) | |||||
| return false; | |||||
| } else | |||||
| #endif | |||||
| { | |||||
| if (!DecodeVarint(out_size, this)) | |||||
| return false; | |||||
| } | |||||
| } | |||||
| bit_mode_ = true; | |||||
| bit_decoder_.reset(data_head(), remaining_size()); | |||||
| return true; | |||||
| } | |||||
| void DecoderBuffer::EndBitDecoding() { | |||||
| bit_mode_ = false; | |||||
| const uint64_t bits_decoded = bit_decoder_.BitsDecoded(); | |||||
| const uint64_t bytes_decoded = (bits_decoded + 7) / 8; | |||||
| pos_ += bytes_decoded; | |||||
| } | |||||
| DecoderBuffer::BitDecoder::BitDecoder() | |||||
| : bit_buffer_(nullptr), bit_buffer_end_(nullptr), bit_offset_(0) {} | |||||
| DecoderBuffer::BitDecoder::~BitDecoder() {} | |||||
| } // namespace draco | |||||