Source/WebCore/platform/network/ParsedContentRange.h

/*
 * Copyright (C) 2016 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

#pragma once

#include <wtf/Forward.h>
#include <wtf/Markable.h>

namespace WebCore {

class ParsedContentRange {
public:
    static constexpr int64_t invalidLength = std::numeric_limits<int64_t>::min();
    static constexpr int64_t unknownLength = std::numeric_limits<int64_t>::max();

    WEBCORE_EXPORT explicit ParsedContentRange(const String&);
    WEBCORE_EXPORT ParsedContentRange(int64_t firstBytePosition, int64_t lastBytePosition, int64_t instanceLength);
    ParsedContentRange() = default;

    bool isValid() const { return m_instanceLength != invalidLength; }
    int64_t firstBytePosition() const { return m_firstBytePosition; }
    int64_t lastBytePosition() const { return m_lastBytePosition; }
    int64_t instanceLength() const { return m_instanceLength; }

    static ParsedContentRange invalidValue()
    {
        return ParsedContentRange();
    }

    WEBCORE_EXPORT String headerValue() const;

    struct MarkableTraits {
        static bool isEmptyValue(const ParsedContentRange& range)
        {
            return !range.isValid();
        }

        static ParsedContentRange emptyValue()
        {
            return ParsedContentRange::invalidValue();
        }
    };

private:
    int64_t m_firstBytePosition { 0 };
    int64_t m_lastBytePosition { 0 };
    int64_t m_instanceLength { invalidLength };
};

}