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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package com.sun.imageio.plugins.common; | ||
| 27 | |||
| 28 | import java.io.IOException; | ||
| 29 | import javax.imageio.stream.ImageInputStreamImpl; | ||
| 30 | import javax.imageio.stream.ImageInputStream; | ||
| 31 | |||
| 32 | public final class SubImageInputStream extends ImageInputStreamImpl { | ||
| 33 | |||
| 34 | ImageInputStream stream; | ||
| 35 | long startingPos; | ||
| 36 | int startingLength; | ||
| 37 | int length; | ||
| 38 | |||
| 39 | public SubImageInputStream(ImageInputStream stream, int length) | ||
| 40 | throws IOException { | ||
| 41 | this.stream = stream; | ||
| 42 | this.startingPos = stream.getStreamPosition(); | ||
| 43 | this.startingLength = this.length = length; | ||
| 44 | } | ||
| 45 | |||
| 46 | public int read() throws IOException { | ||
| 47 | if (length == 0) { // Local EOF | ||
| 48 | return -1; | ||
| 49 | } else { | ||
| 50 | --length; | ||
| 51 | return stream.read(); | ||
| 52 | } | ||
| 53 | } | ||
| 54 | |||
| 55 | public int read(byte[] b, int off, int len) throws IOException { | ||
| 56 | if (length == 0) { // Local EOF | ||
| 57 | return -1; | ||
| 58 | } | ||
| 59 | |||
| 60 | len = Math.min(len, length); | ||
| 61 | int bytes = stream.read(b, off, len); | ||
| 62 | length -= bytes; | ||
| 63 | return bytes; | ||
| 64 | } | ||
| 65 | |||
| 66 | public long length() { | ||
| 67 | return startingLength; | ||
| 68 | } | ||
| 69 | |||
| 70 | public void seek(long pos) throws IOException { | ||
| 71 | stream.seek(pos - startingPos); | ||
| 72 | streamPos = pos; | ||
| 73 | } | ||
| 74 | |||
| 75 | protected void finalize() throws Throwable { | ||
| 76 | // Empty finalizer (for improved performance; no need to call | ||
| 77 | // super.finalize() in this case) | ||
| 78 | } | ||
| 79 | } | ||