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65 lines
2.0 KiB
65 lines
2.0 KiB
// Copyright (c) 2016 The WebM project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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#ifndef SRC_DATE_PARSER_H_
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#define SRC_DATE_PARSER_H_
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#include <cassert>
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#include <cstdint>
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#include "src/element_parser.h"
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#include "webm/callback.h"
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#include "webm/element.h"
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#include "webm/reader.h"
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#include "webm/status.h"
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namespace webm {
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// Parses an EBML date from a byte stream. EBML dates are signed integer values
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// that represent the offset, in nanoseconds, from 2001-01-01T00:00:00.00 UTC.
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class DateParser : public ElementParser {
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public:
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// Constructs a new parser which will use the given default_value as the
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// value for the element if its size is zero. Defaults to the value zero (as
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// the EBML spec indicates).
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explicit DateParser(std::int64_t default_value = 0);
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DateParser(DateParser&&) = default;
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DateParser& operator=(DateParser&&) = default;
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DateParser(const DateParser&) = delete;
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DateParser& operator=(const DateParser&) = delete;
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Status Init(const ElementMetadata& metadata, std::uint64_t max_size) override;
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Status Feed(Callback* callback, Reader* reader,
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std::uint64_t* num_bytes_read) override;
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// Gets the parsed date. This must not be called until the parse had been
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// successfully completed.
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std::int64_t value() const {
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assert(num_bytes_remaining_ == 0);
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return value_;
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}
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// Gets the parsed date. This must not be called until the parse had been
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// successfully completed.
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std::int64_t* mutable_value() {
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assert(num_bytes_remaining_ == 0);
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return &value_;
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}
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private:
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std::int64_t value_;
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std::int64_t default_value_;
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int num_bytes_remaining_ = -1;
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};
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} // namespace webm
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#endif // SRC_DATE_PARSER_H_
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