1 files changed, 109 insertions, 0 deletions
diff --git a/bundles/ie.wombat.jbdiff/src/ie/wombat/jbdiff/Util.java b/bundles/ie.wombat.jbdiff/src/ie/wombat/jbdiff/Util.java
new file mode 100644
index 000000000..175808e84
--- /dev/null
+++ b/bundles/ie.wombat.jbdiff/src/ie/wombat/jbdiff/Util.java
@@ -0,0 +1,109 @@
+/*
+ * Created on Feb 28, 2005
+ */
+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;
+		}
+	}
+
+}