1 /* 2 * Copyright (c) 2008, 2009, Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef XBMImageDecoder_h 32 #define XBMImageDecoder_h 33 34 #include "ImageDecoder.h" 35 36 namespace WebCore { 37 38 // This class decodes the XBM image format. 39 class XBMImageDecoder : public ImageDecoder { 40 public: 41 XBMImageDecoder(); ~XBMImageDecoder()42 virtual ~XBMImageDecoder() {} 43 filenameExtension()44 virtual String filenameExtension() const { return "xbm"; } 45 46 virtual void setData(SharedBuffer* data, bool allDataReceived); 47 // Whether or not the size information has been decoded yet. 48 virtual bool isSizeAvailable(); 49 virtual RGBA32Buffer* frameBufferAtIndex(size_t index); 50 51 private: 52 // Restricts image size to something "reasonable". 53 // This protects agains ridiculously large XBMs and prevents bad things 54 // like overflow of m_bitsDecoded. 55 static const int maxDimension = 65535; 56 57 // In X10, an array of type "short" is used to declare the image bits, 58 // but in X11, the type is "char". 59 enum DataType { 60 Unknown, 61 X10, 62 X11, 63 }; 64 65 bool decodeHeader(); 66 bool decodeDatum(uint16_t* result); 67 bool decodeData(); 68 void decode(bool sizeOnly); 69 70 // FIXME: Copying all the XBM data just so we can NULL-terminate, just 71 // so we can use sscanf() and friends, is lame. The decoder should be 72 // rewritten to operate on m_data directly. 73 Vector<char> m_xbmString; // Null-terminated copy of the XBM data. 74 size_t m_decodeOffset; // The current offset in m_xbmString for decoding. 75 bool m_allDataReceived; 76 bool m_decodedHeader; 77 enum DataType m_dataType; 78 int m_bitsDecoded; 79 }; 80 81 } // namespace WebCore 82 83 #endif 84