80 lines
2.6 KiB
Java
80 lines
2.6 KiB
Java
/*
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* Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.imageio.plugins.common;
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import java.io.IOException;
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import javax.imageio.stream.ImageInputStreamImpl;
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import javax.imageio.stream.ImageInputStream;
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public final class SubImageInputStream extends ImageInputStreamImpl {
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ImageInputStream stream;
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long startingPos;
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int startingLength;
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int length;
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public SubImageInputStream(ImageInputStream stream, int length)
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throws IOException {
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this.stream = stream;
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this.startingPos = stream.getStreamPosition();
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this.startingLength = this.length = length;
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}
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public int read() throws IOException {
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if (length == 0) { // Local EOF
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return -1;
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} else {
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--length;
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return stream.read();
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}
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}
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public int read(byte[] b, int off, int len) throws IOException {
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if (length == 0) { // Local EOF
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return -1;
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}
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len = Math.min(len, length);
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int bytes = stream.read(b, off, len);
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length -= bytes;
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return bytes;
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}
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public long length() {
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return startingLength;
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}
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public void seek(long pos) throws IOException {
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stream.seek(pos - startingPos);
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streamPos = pos;
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}
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protected void finalize() throws Throwable {
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// Empty finalizer (for improved performance; no need to call
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// super.finalize() in this case)
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}
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}
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