Source/WebCore/platform/encryptedmedia/CDMUtilities.cpp

/*
 * Copyright (C) 2020 Metrological Group B.V.
 * Copyright (C) 2020 Igalia S.L.
 *
 * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * HOLDER 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
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "CDMUtilities.h"

#if ENABLE(ENCRYPTED_MEDIA)

#include "SharedBuffer.h"
#include <wtf/text/WTFString.h>

namespace WebCore {

namespace CDMUtilities {

RefPtr<JSON::Object> parseJSONObject(const SharedBuffer& buffer)
{
    // Fail on large buffers whose size doesn't fit into a 32-bit unsigned integer.
    size_t size = buffer.size();
    if (size > std::numeric_limits<unsigned>::max())
        return nullptr;

    // Parse the buffer contents as JSON, returning the root object (if any).
    String json { buffer.data(), static_cast<unsigned>(size) };

    auto value = JSON::Value::parseJSON(json);
    if (!value)
        return nullptr;

    return value->asObject();
}

};

};

#endif // ENABLE(ENCRYPTED_MEDIA)