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;
+    }
+}