| // Copyright (c) 2016 The WebM project authors. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the LICENSE 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. |
| #ifndef SRC_VAR_INT_PARSER_H_ |
| #define SRC_VAR_INT_PARSER_H_ |
| |
| #include <cassert> |
| #include <cstdint> |
| |
| #include "src/parser.h" |
| #include "webm/callback.h" |
| #include "webm/reader.h" |
| #include "webm/status.h" |
| |
| namespace webm { |
| |
| class VarIntParser : public Parser { |
| public: |
| VarIntParser() = default; |
| VarIntParser(VarIntParser&&) = default; |
| VarIntParser& operator=(VarIntParser&&) = default; |
| |
| VarIntParser(const VarIntParser&) = delete; |
| VarIntParser& operator=(const VarIntParser&) = delete; |
| |
| Status Feed(Callback* callback, Reader* reader, |
| std::uint64_t* num_bytes_read) override; |
| |
| // Gets the parsed value. This must not be called until the parse had been |
| // successfully completed. |
| std::uint64_t value() const { |
| assert(num_bytes_remaining_ == 0); |
| return value_; |
| } |
| |
| // Gets the number of bytes which were used to encode the integer value in the |
| // byte stream. This must not be called until the parse had been successfully |
| // completed. |
| int encoded_length() const { |
| assert(num_bytes_remaining_ == 0); |
| return total_data_bytes_ + 1; |
| } |
| |
| private: |
| int num_bytes_remaining_ = -1; |
| int total_data_bytes_; |
| std::uint64_t value_; |
| }; |
| |
| } // namespace webm |
| |
| #endif // SRC_VAR_INT_PARSER_H_ |