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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.
*/
#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
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