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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
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 objects read image headers to determine the image size.
*
* @author Pankaj Narula
* @version $Id: ImageReader.java,v 1.9 2003/03/06 21:25:45 jeremias Exp $
*/
public interface ImageReader {
/**
* Verify image type. If the stream does not contain image data expected by
* the reader it must reset the stream to the start. This is so that the
* next reader can start reading from the start. The reader must not close
* the stream unless it can handle the image and it has read the
* information.
*
* @param bis Image buffered input stream
* @param uri URI to the image
* @param ua The user agent
* @return <code>true</code> if image type is the handled one
* @exception IOException if an I/O error occurs
*/
FopImage.ImageInfo verifySignature(String uri, InputStream bis,
FOUserAgent ua)
throws IOException;
}
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