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/*
* Copyright (c) 2008, 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 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
* OWNER 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 XBMImageDecoder_h
#define XBMImageDecoder_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;
};
} // namespace WebCore
#endif
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