| /* |
| * Copyright (c) 2005, Joe Desbonnet, (jdesbonnet@gmail.com) |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * * Neither the name of the <organization> nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY <copyright holder> ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package ie.wombat.jbdiff; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * @author |
| * @author Joe Desbonnet, joe@galway.net |
| * |
| */ |
| public class Util { |
| |
| // JBDiff extensions by Stefan.Liebig@compeople.de: |
| // |
| // - introduced a HEADER_SIZE constant here |
| |
| /** |
| * Length of the diff file header. |
| */ |
| public static final int HEADER_SIZE = 32; |
| |
| /** |
| * Equiv of C library memcmp(). |
| * |
| * @param s1 |
| * @param s1offset |
| * @param s2 |
| * @param n |
| * @return |
| */ |
| /* |
| * public final static int memcmp(byte[] s1, int s1offset, byte[] s2, int |
| * s2offset, int n) { |
| * |
| * if ((s1offset + n) > s1.length) { n = s1.length - s1offset; } if |
| * ((s2offset + n) > s2.length) { n = s2.length - s2offset; } for (int i = |
| * 0; i < n; i++) { if (s1[i + s1offset] != s2[i + s2offset]) { return s1[i + |
| * s1offset] < s2[i + s2offset] ? -1 : 1; } } |
| * |
| * return 0; } |
| */ |
| |
| /** |
| * Equiv of C library memcmp(). |
| * |
| * @param s1 |
| * @param s1offset |
| * @param s2 |
| * @param n |
| * @return |
| */ |
| public final static int memcmp(byte[] s1, int s1Size, int s1offset, |
| byte[] s2, int s2Size, int s2offset) { |
| |
| int n = s1Size - s1offset; |
| |
| if (n > (s2Size - s2offset)) { |
| n = s2Size - s2offset; |
| } |
| for (int i = 0; i < n; i++) { |
| if (s1[i + s1offset] != s2[i + s2offset]) { |
| return s1[i + s1offset] < s2[i + s2offset] ? -1 : 1; |
| } |
| } |
| |
| return 0; |
| // int n = s1.length - s1offset; |
| // |
| // if (n > (s2.length - s2offset)) { |
| // n = s2.length - s2offset; |
| // } |
| // for (int i = 0; i < n; i++) { |
| // if (s1[i + s1offset] != s2[i + s2offset]) { |
| // return s1[i + s1offset] < s2[i + s2offset] ? -1 : 1; |
| // } |
| // } |
| // |
| // return 0; |
| } |
| |
| /** |
| * Read from input stream and fill the given buffer from the given offset up |
| * to length len. |
| * |
| * @param in |
| * @param buf |
| * @param offset |
| * @param len |
| * @throws IOException |
| */ |
| public static final void readFromStream(InputStream in, byte[] buf, |
| int offset, int len) throws IOException { |
| |
| int totalBytesRead = 0; |
| while (totalBytesRead < len) { |
| int bytesRead = in.read(buf, offset + totalBytesRead, len |
| - totalBytesRead); |
| if (bytesRead < 0) { |
| throw new IOException( |
| "Could not read expected number of bytes."); |
| } |
| totalBytesRead += bytesRead; |
| } |
| } |
| |
| } |