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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/javax/imageio/bmp/BMPFileHeader.java | |
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Diffstat (limited to 'libjava/classpath/gnu/javax/imageio/bmp/BMPFileHeader.java')
-rw-r--r-- | libjava/classpath/gnu/javax/imageio/bmp/BMPFileHeader.java | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/imageio/bmp/BMPFileHeader.java b/libjava/classpath/gnu/javax/imageio/bmp/BMPFileHeader.java new file mode 100644 index 000000000..0cfd72323 --- /dev/null +++ b/libjava/classpath/gnu/javax/imageio/bmp/BMPFileHeader.java @@ -0,0 +1,151 @@ +/* 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; + } +} |