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/* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources."
*/
package org.apache.fop.image.analyser;
// Java
import java.io.BufferedInputStream;
import java.io.IOException;
/**
* ImageReader object for BMP image type.
* @author Pankaj Narula
* @version 1.0
*/
public class BMPReader extends AbstractImageReader {
static protected final int BMP_SIG_LENGTH = 26;
protected byte[] header;
public boolean verifySignature(String uri, BufferedInputStream fis)
throws IOException {
this.imageStream = fis;
this.setDefaultHeader();
boolean supported = ((header[0] == (byte) 0x42) &&
(header[1] == (byte) 0x4d));
if (supported) {
setDimension();
return true;
} else
return false;
}
public String getMimeType() {
return "image/bmp";
}
protected void setDimension() {
//little endian notation
int byte1 = header[18] & 0xff;
int byte2 = header[19] & 0xff;
int byte3 = header[20] & 0xff;
int byte4 = header[21] & 0xff;
long l = (long)((byte4 << 24) | (byte3 << 16) |
(byte2 << 8) | byte1);
this.width = (int)(l & 0xffffffff);
byte1 = header[22] & 0xff;
byte2 = header[23] & 0xff;
byte3 = header[24] & 0xff;
byte4 = header[25] & 0xff;
l = (long)((byte4 << 24) | (byte3 << 16) | (byte2 << 8) |
byte1);
this.height = (int)(l & 0xffffffff);
}
protected void setDefaultHeader() throws IOException {
this.header = new byte[BMP_SIG_LENGTH];
try {
this.imageStream.mark(BMP_SIG_LENGTH + 1);
this.imageStream.read(header);
this.imageStream.reset();
} catch (IOException ex) {
try {
this.imageStream.reset();
} catch (IOException exbis) {}
throw ex;
}
}
}
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