Source/WebCore/platform/ContentType.cpp

/*
 * Copyright (C) 2006, 2008, 2013 Apple Inc.  All rights reserved.
 * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 * Copyright (C) 2009 Google 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 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 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
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "ContentType.h"
#include "HTMLParserIdioms.h"
#include <wtf/JSONValues.h>
#include <wtf/NeverDestroyed.h>

namespace WebCore {

ContentType::ContentType(String&& contentType)
    : m_type(WTFMove(contentType))
{
}

ContentType::ContentType(const String& contentType)
    : m_type(contentType)
{
}

const String& ContentType::codecsParameter()
{
    static NeverDestroyed<String> codecs { "codecs"_s };
    return codecs;
}

const String& ContentType::profilesParameter()
{
    static NeverDestroyed<String> profiles { "profiles"_s };
    return profiles;
}

String ContentType::parameter(const String& parameterName) const
{
    String parameterValue;
    String strippedType = m_type.stripWhiteSpace();

    // a MIME type can have one or more "param=value" after a semi-colon, and separated from each other by semi-colons
    size_t semi = strippedType.find(';');
    if (semi != notFound) {
        size_t start = strippedType.findIgnoringASCIICase(parameterName, semi + 1);
        if (start != notFound) {
            start = strippedType.find('=', start + parameterName.length());
            if (start != notFound) {
                size_t quote = strippedType.find('\"', start + 1);
                size_t end = strippedType.find('\"', start + 2);
                if (quote != notFound && end != notFound)
                    start = quote;
                else {
                    end = strippedType.find(';', start + 1);
                    if (end == notFound)
                        end = strippedType.length();
                }
                parameterValue = strippedType.substring(start + 1, end - (start + 1)).stripWhiteSpace();
            }
        }
    }

    return parameterValue;
}

String ContentType::containerType() const
{
    String strippedType = m_type.stripWhiteSpace();

    // "type" can have parameters after a semi-colon, strip them
    size_t semi = strippedType.find(';');
    if (semi != notFound)
        strippedType = strippedType.left(semi).stripWhiteSpace();

    return strippedType;
}

static inline Vector<String> splitParameters(StringView parametersView)
{
    Vector<String> result;
    for (auto view : parametersView.split(','))
        result.append(view.stripLeadingAndTrailingMatchedCharacters(isHTMLSpace<UChar>).toString());
    return result;
}

Vector<String> ContentType::codecs() const
{
    return splitParameters(parameter(codecsParameter()));
}

Vector<String> ContentType::profiles() const
{
    return splitParameters(parameter(profilesParameter()));
}

String ContentType::toJSONString() const
{
    auto object = JSON::Object::create();

    object->setString("containerType"_s, containerType());

    auto codecs = codecsParameter();
    if (!codecs.isEmpty())
        object->setString("codecs"_s, codecs);

    auto profiles = profilesParameter();
    if (!profiles.isEmpty())
        object->setString("profiles"_s, profiles);

    return object->toJSONString();
}

} // namespace WebCore