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/*
* Copyright (C) 2006 Apple Computer, 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
* 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.
*/
#ifndef XBM_DECODER_H_
#define XBM_DECODER_H_
#include "config.h"
#include <string>
#include "ImageDecoder.h"
namespace WebCore {
// This class decodes the XBM image format.
class XBMImageDecoder : public ImageDecoder
{
public:
XBMImageDecoder();
virtual ~XBMImageDecoder() {}
virtual String filenameExtension() const { return "xbm"; }
virtual void setData(SharedBuffer* data, bool allDataReceived);
// Whether or not the size information has been decoded yet.
virtual bool isSizeAvailable() const;
virtual RGBA32Buffer* frameBufferAtIndex(size_t index);
private:
// Restricts image size to something "reasonable".
// This protects agains ridiculously large XBMs and prevents bad things
// like overflow of m_bitsDecoded.
static const int maxDimension = 65535;
// In X10, an array of type "short" is used to declare the image bits,
// but in X11, the type is "char".
enum DataType {
UNKNOWN,
X10,
X11,
};
bool decodeHeader();
bool decodeDatum(uint16_t* result);
bool decodeData();
void decodeXBM(bool sizeOnly);
std::string m_xbmString; // Null-terminated copy of the XBM data.
size_t m_decodeOffset; // The current offset in m_xbmString for decoding.
bool m_allDataReceived;
bool m_decodedHeader;
enum DataType m_dataType;
int m_bitsDecoded;
};
}
#endif
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