/*
* Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.imageio.plugins.common;
import java.io.IOException;
import javax.imageio.stream.ImageInputStreamImpl;
import javax.imageio.stream.ImageInputStream;
/**
*/
public final class SubImageInputStream extends ImageInputStreamImpl {
ImageInputStream stream;
long startingPos;
int startingLength;
int length;
public SubImageInputStream(ImageInputStream stream, int length)
throws IOException {
this.stream = stream;
this.startingPos = stream.getStreamPosition();
this.startingLength = this.length = length;
}
public int read() throws IOException {
if (length == 0) { // Local EOF
return -1;
} else {
--length;
return stream.read();
}
}
public int read(byte[] b, int off, int len) throws IOException {
if (length == 0) { // Local EOF
return -1;
}
len = Math.min(len, length);
int bytes = stream.read(b, off, len);
length -= bytes;
return bytes;
}
public long length() {
return startingLength;
}
public void seek(long pos) throws IOException {
stream.seek(pos - startingPos);
streamPos = pos;
}
protected void finalize() throws Throwable {
// Empty finalizer (for improved performance; no need to call
// super.finalize() in this case)
}
}