| /* |
| * 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) |
| } |
| } |