Source/WebCore/html/ImageData.cpp

/*
 * Copyright (C) 2008 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#include "config.h"
#include "ImageData.h"

namespace WebCore {

PassRefPtr<ImageData> ImageData::create(const IntSize& size)
{
    Checked<int, RecordOverflow> dataSize = 4;
    dataSize *= size.width();
    dataSize *= size.height();
    if (dataSize.hasOverflowed())
        return 0;

    return adoptRef(new ImageData(size));
}

PassRefPtr<ImageData> ImageData::create(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
{
    Checked<int, RecordOverflow> dataSize = 4;
    dataSize *= size.width();
    dataSize *= size.height();
    if (dataSize.hasOverflowed())
        return 0;

    if (dataSize.unsafeGet() < 0
        || static_cast<unsigned>(dataSize.unsafeGet()) > byteArray->length())
        return 0;

    return adoptRef(new ImageData(size, byteArray));
}

ImageData::ImageData(const IntSize& size)
    : m_size(size)
    , m_data(Uint8ClampedArray::createUninitialized(size.width() * size.height() * 4))
{
}

ImageData::ImageData(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
    : m_size(size)
    , m_data(byteArray)
{
    ASSERT_WITH_SECURITY_IMPLICATION(static_cast<unsigned>(size.width() * size.height() * 4) <= m_data->length());
}

}