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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.
- #ifndef MEDIA_BASE_BIT_READER_H_
- #define MEDIA_BASE_BIT_READER_H_
- #include <stdint.h>
- #include <string>
- #include "base/compiler_specific.h"
- #include "media/base/bit_reader_core.h"
- #include "media/base/media_export.h"
- namespace media {
- class MEDIA_EXPORT BitReader : private BitReaderCore::ByteStreamProvider {
- public:
- // Initialize the reader to start reading at |data|, |size| being size
- // of |data| in bytes.
- BitReader(const uint8_t* data, int size);
- BitReader(const BitReader&) = delete;
- BitReader& operator=(const BitReader&) = delete;
- ~BitReader() override;
- template<typename T> bool ReadBits(int num_bits, T* out) {
- return bit_reader_core_.ReadBits(num_bits, out);
- }
- bool ReadFlag(bool* flag) {
- return bit_reader_core_.ReadFlag(flag);
- }
- // Read |num_bits| of binary data into |str|. |num_bits| must be a positive
- // multiple of 8. This is not efficient for extracting large strings.
- // If false is returned, |str| may not be valid.
- bool ReadString(int num_bits, std::string* str);
- bool SkipBits(int num_bits) {
- return bit_reader_core_.SkipBits(num_bits);
- }
- int bits_available() const {
- return initial_size_ * 8 - bits_read();
- }
- int bits_read() const {
- return bit_reader_core_.bits_read();
- }
- private:
- // BitReaderCore::ByteStreamProvider implementation.
- int GetBytes(int max_n, const uint8_t** out) override;
- // Total number of bytes that was initially passed to BitReader.
- const int initial_size_;
- // Pointer to the next unread byte in the stream.
- const uint8_t* data_;
- // Bytes left in the stream.
- int bytes_left_;
- BitReaderCore bit_reader_core_;
- };
- } // namespace media
- #endif // MEDIA_BASE_BIT_READER_H_
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