| /* BMPFileHeader.java -- |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.javax.imageio.bmp; |
| |
| import java.awt.image.RenderedImage; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| |
| import javax.imageio.IIOImage; |
| import javax.imageio.stream.ImageInputStream; |
| import javax.imageio.stream.ImageOutputStream; |
| |
| public class BMPFileHeader { |
| /** Header signature, always 'BM' */ |
| private final static short bfType = 0x424d; |
| |
| /** Bitmap file size, in bytes. */ |
| protected long bfSize; |
| |
| /** Offset from the beginning of the file to the bitmap data */ |
| protected long bfOffBits; |
| |
| /** BITMAPFILEHEADER is 14 bytes */ |
| public static final int SIZE = 14; |
| private static final int BITMAPINFOHEADER_SIZE = 40; |
| |
| /** |
| * Creates the header from an input stream, which is not closed. |
| * |
| * @throws IOException if an I/O error occured. |
| * @throws BMPException if the header was invalid |
| */ |
| public BMPFileHeader(ImageInputStream in) throws IOException, BMPException { |
| byte[] data = new byte[SIZE]; |
| |
| if (in.read(data) != SIZE) |
| throw new IOException("Couldn't read header."); |
| ByteBuffer buf = ByteBuffer.wrap(data); |
| |
| if(buf.getShort(0) != bfType) |
| throw new BMPException("Not a BMP file."); |
| |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| |
| // get size (keep unsigned) |
| bfSize = ((long)buf.getInt(2) & (0xFFFFFFFF)); |
| |
| // Two reserved shorts are here, and should be zero, |
| // perhaps they should be tested to be zero, but I don't |
| // feel this strictness is necessary. |
| |
| bfOffBits = ((long)buf.getInt(10) & (0xFFFFFFFF)); |
| } |
| |
| /** |
| * Creates the header from an output stream, which is not closed. |
| * |
| * @param out - the image output stream |
| * @param im - the image |
| * @throws IOException if an I/O error occured. |
| */ |
| public BMPFileHeader(ImageOutputStream out, IIOImage im) throws IOException |
| { |
| RenderedImage img = im.getRenderedImage(); |
| int w = img.getWidth(); |
| int h = img.getHeight(); |
| |
| bfOffBits = SIZE + BITMAPINFOHEADER_SIZE; |
| bfSize = ((w * h) * 3) + ((4 - ((w * 3) % 4)) * h) + bfOffBits; |
| |
| write(out); |
| } |
| |
| /** |
| * Writes the header to an output stream, which is not closed or flushed. |
| * |
| * @throws IOException if an I/O error occured. |
| */ |
| public void write(ImageOutputStream out) throws IOException { |
| ByteBuffer buf = ByteBuffer.allocate(SIZE); |
| buf.putShort(0, bfType); // ID |
| buf.putInt(2, (int)(bfSize & (0xFFFFFFFF))); // size |
| buf.putInt(6, 0); // 4 reserved bytes set to zero |
| buf.putInt(7, (int)(bfOffBits & (0xFFFFFFFF))); // size |
| out.write(buf.array()); |
| } |
| |
| /** |
| * Sets the file size |
| */ |
| public void setSize(long size){ |
| bfSize = size; |
| } |
| |
| /** |
| * Sets the bitmap offset within the file |
| */ |
| public void setOffset(long offset){ |
| bfOffBits = offset; |
| } |
| |
| /** |
| * Gets the file size |
| */ |
| public long getSize(){ |
| return bfSize; |
| } |
| |
| /** |
| * Gets the bitmap offset within the file |
| */ |
| public long getOffset(){ |
| return bfOffBits; |
| } |
| } |
| |
| |