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| // Copyright (c) 2012 The Chromium Authors. All rights reserved.
| // Use of this source code is governed by a BSD-style license that can be
| // found in the LICENSE file.
| // Note: ported from Chromium commit head: 2de6929
|
| #include "bit_reader.h"
|
| namespace media {
|
| BitReader::BitReader(const uint8_t* data, int size)
| : initial_size_(size),
| data_(data),
| bytes_left_(size),
| bit_reader_core_(this) {
| DCHECK(data != NULL);
| DCHECK_GE(size, 0);
| }
|
| BitReader::~BitReader() = default;
|
| bool BitReader::ReadString(int num_bits, std::string* str) {
| DCHECK_EQ(num_bits % 8, 0);
| DCHECK_GT(num_bits, 0);
| DCHECK(str);
| int num_bytes = num_bits / 8;
| str->resize(num_bytes);
| char* ptr = &str->front();
| while (num_bytes--) {
| if (!ReadBits(8, ptr++))
| return false;
| }
| return true;
| }
|
| int BitReader::GetBytes(int max_nbytes, const uint8_t** out) {
| DCHECK_GE(max_nbytes, 0);
| DCHECK(out);
|
| int nbytes = max_nbytes;
| if (nbytes > bytes_left_)
| nbytes = bytes_left_;
|
| *out = data_;
| data_ += nbytes;
| bytes_left_ -= nbytes;
| return nbytes;
| }
|
| } // namespace media
|
|
