J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996-1999 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.util.zip; |
| 27 | |
| 28 | import java.io.FilterOutputStream; |
| 29 | import java.io.OutputStream; |
| 30 | import java.io.IOException; |
| 31 | |
| 32 | /** |
| 33 | * An output stream that also maintains a checksum of the data being |
| 34 | * written. The checksum can then be used to verify the integrity of |
| 35 | * the output data. |
| 36 | * |
| 37 | * @see Checksum |
| 38 | * @author David Connelly |
| 39 | */ |
| 40 | public |
| 41 | class CheckedOutputStream extends FilterOutputStream { |
| 42 | private Checksum cksum; |
| 43 | |
| 44 | /** |
| 45 | * Creates an output stream with the specified Checksum. |
| 46 | * @param out the output stream |
| 47 | * @param cksum the checksum |
| 48 | */ |
| 49 | public CheckedOutputStream(OutputStream out, Checksum cksum) { |
| 50 | super(out); |
| 51 | this.cksum = cksum; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Writes a byte. Will block until the byte is actually written. |
| 56 | * @param b the byte to be written |
| 57 | * @exception IOException if an I/O error has occurred |
| 58 | */ |
| 59 | public void write(int b) throws IOException { |
| 60 | out.write(b); |
| 61 | cksum.update(b); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Writes an array of bytes. Will block until the bytes are |
| 66 | * actually written. |
| 67 | * @param b the data to be written |
| 68 | * @param off the start offset of the data |
| 69 | * @param len the number of bytes to be written |
| 70 | * @exception IOException if an I/O error has occurred |
| 71 | */ |
| 72 | public void write(byte[] b, int off, int len) throws IOException { |
| 73 | out.write(b, off, len); |
| 74 | cksum.update(b, off, len); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Returns the Checksum for this output stream. |
| 79 | * @return the Checksum |
| 80 | */ |
| 81 | public Checksum getChecksum() { |
| 82 | return cksum; |
| 83 | } |
| 84 | } |