| // 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_FLOAT_PARSER_H_ |
| #define SRC_FLOAT_PARSER_H_ |
| |
| #include <cassert> |
| #include <cstdint> |
| |
| #include "src/element_parser.h" |
| #include "webm/callback.h" |
| #include "webm/element.h" |
| #include "webm/reader.h" |
| #include "webm/status.h" |
| |
| namespace webm { |
| |
| // Parses an EBML float from a byte stream. |
| class FloatParser : public ElementParser { |
| public: |
| // Constructs a new parser which will use the given default_value as the |
| // value for the element if its size is zero. Defaults to the value zero (as |
| // the EBML spec indicates). |
| explicit FloatParser(double default_value = 0.0); |
| |
| FloatParser(FloatParser&&) = default; |
| FloatParser& operator=(FloatParser&&) = default; |
| |
| FloatParser(const FloatParser&) = delete; |
| FloatParser& operator=(const FloatParser&) = delete; |
| |
| Status Init(const ElementMetadata& metadata, std::uint64_t max_size) override; |
| |
| Status Feed(Callback* callback, Reader* reader, |
| std::uint64_t* num_bytes_read) override; |
| |
| // Gets the parsed float. This must not be called until the parse had been |
| // successfully completed. |
| double value() const { |
| assert(num_bytes_remaining_ == 0); |
| return value_; |
| } |
| |
| // Gets the parsed float. This must not be called until the parse had been |
| // successfully completed. |
| double* mutable_value() { |
| assert(num_bytes_remaining_ == 0); |
| return &value_; |
| } |
| |
| private: |
| double value_; |
| double default_value_; |
| std::uint64_t uint64_value_; |
| int num_bytes_remaining_ = -1; |
| bool use_32_bits_; |
| }; |
| |
| } // namespace webm |
| |
| #endif // SRC_FLOAT_PARSER_H_ |