/* * 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. */ #include "config.h" #include "BMPImageDecoder.h" namespace WebCore { // Number of bits in .BMP used to store the file header (doesn't match // "sizeof(BMPImageDecoder::BitmapFileHeader)" since we omit some fields and // don't pack). static const size_t sizeOfFileHeader = 14; void BMPImageDecoder::decodeImage(SharedBuffer* data) { // Read and process file header. if ((m_decodedOffset < sizeOfFileHeader) && !processFileHeader(data)) return; // Decode BMP. decodeBMP(data); } bool BMPImageDecoder::processFileHeader(SharedBuffer* data) { // Read file header. ASSERT(!m_decodedOffset); if (data->size() < sizeOfFileHeader) return false; const uint16_t fileType = (data->data()[0] << 8) | static_cast<uint8_t>(data->data()[1]); m_imgDataOffset = readUint32(data, 10); m_decodedOffset = m_headerOffset = sizeOfFileHeader; // See if this is a bitmap filetype we understand. enum { BMAP = 'BM', // The following additional OS/2 2.x header values (see // http://www.fileformat.info/format/os2bmp/egff.htm ) aren't widely // decoded, and are unlikely to be in much use. /* ICON = 'IC', POINTER = 'PT', COLORICON = 'CI', COLORPOINTER = 'CP', BITMAPARRAY = 'BA', */ }; if (fileType != BMAP) m_failed = true; return !m_failed; } } // namespace WebCore