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- /*
- * $Id: TIFFReader.java,v 1.9 2003/03/06 21:25:45 jeremias Exp $
- * ============================================================================
- * The Apache Software License, Version 1.1
- * ============================================================================
- *
- * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modifica-
- * tion, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. 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.
- *
- * 3. The end-user documentation included with the redistribution, if any, must
- * include the following acknowledgment: "This product includes software
- * developed by the Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself, if
- * and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "FOP" and "Apache Software Foundation" must not be used to
- * endorse or promote products derived from this software without prior
- * written permission. For written permission, please contact
- * apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache", nor may
- * "Apache" appear in their name, without prior written permission of the
- * Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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
- * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
- * DING, 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.
- * ============================================================================
- *
- * This software consists of voluntary contributions made by many individuals
- * on behalf of the Apache Software Foundation and was originally created by
- * James Tauber <jtauber@jtauber.com>. For more information on the Apache
- * Software Foundation, please see <http://www.apache.org/>.
- */
- package org.apache.fop.image.analyser;
-
- // Java
- import java.io.InputStream;
- import java.io.IOException;
-
- // FOP
- import org.apache.fop.image.FopImage;
- import org.apache.fop.apps.FOUserAgent;
-
- /**
- * ImageReader object for TIFF image type.
- *
- * @author Pankaj Narula, Michael Lee
- * @version $Id: TIFFReader.java,v 1.9 2003/03/06 21:25:45 jeremias Exp $
- */
- public class TIFFReader implements ImageReader {
-
- private static final int TIFF_SIG_LENGTH = 8;
-
- /** @see org.apache.fop.image.analyser.ImageReader */
- public FopImage.ImageInfo verifySignature(String uri, InputStream bis,
- FOUserAgent ua) throws IOException {
- byte[] header = getDefaultHeader(bis);
- boolean supported = false;
-
- // first 2 bytes = II (little endian encoding)
- if (header[0] == (byte) 0x49 && header[1] == (byte) 0x49) {
-
- // look for '42' in byte 3 and '0' in byte 4
- if (header[2] == 42 && header[3] == 0) {
- supported = true;
- }
- }
-
- // first 2 bytes == MM (big endian encoding)
- if (header[0] == (byte) 0x4D && header[1] == (byte) 0x4D) {
-
- // look for '42' in byte 4 and '0' in byte 3
- if (header[2] == 0 && header[3] == 42) {
- supported = true;
- }
- }
-
- if (supported) {
- FopImage.ImageInfo info = getDimension(header);
- info.mimeType = getMimeType();
- info.inputStream = bis;
- return info;
- } else {
- return null;
- }
- }
-
- /**
- * Returns the MIME type supported by this implementation.
- *
- * @return The MIME type
- */
- public String getMimeType() {
- return "image/tiff";
- }
-
- private FopImage.ImageInfo getDimension(byte[] header) {
- // currently not setting the width and height
- // these are set again by the Jimi image reader.
- // I suppose I'll do it one day to be complete. Or
- // someone else will.
- // Note: bytes 4,5,6,7 contain the byte offset in the stream of the first IFD block
- /*
- * //png is always big endian
- * int byte1 = header[ 16 ] & 0xff;
- * int byte2 = header[ 17 ] & 0xff;
- * int byte3 = header[ 18 ] & 0xff;
- * int byte4 = header[ 19 ] & 0xff;
- * long l = ( long ) ( ( byte1 << 24 ) | ( byte2 << 16 ) |
- * ( byte3 << 8 ) | byte4 );
- * this.width = ( int ) ( l );
- * byte1 = header[ 20 ] & 0xff;
- * byte2 = header[ 21 ] & 0xff;
- * byte3 = header[ 22 ] & 0xff;
- * byte4 = header[ 23 ] & 0xff;
- * l = ( long ) ( ( byte1 << 24 ) | ( byte2 << 16 ) | ( byte3 << 8 ) |
- * byte4 );
- * this.height = ( int ) ( l );
- */
- FopImage.ImageInfo info = new FopImage.ImageInfo();
- info.width = -1;
- info.height = -1;
- return info;
- }
-
- private byte[] getDefaultHeader(InputStream imageStream)
- throws IOException {
- byte[] header = new byte[TIFF_SIG_LENGTH];
- try {
- imageStream.mark(TIFF_SIG_LENGTH + 1);
- imageStream.read(header);
- imageStream.reset();
- } catch (IOException ex) {
- try {
- imageStream.reset();
- } catch (IOException exbis) {
- // throw the original exception, not this one
- }
- throw ex;
- }
- return header;
- }
-
- }
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