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Subject: svn commit: r1129522 -
 /jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/util/StringUtils.java
Date: Tue, 31 May 2011 07:40:37 -0000
To: commits@jackrabbit.apache.org
From: thomasm@apache.org
Message-Id: <20110531074037.929E823888FD@eris.apache.org>

Author: thomasm
Date: Tue May 31 07:40:37 2011
New Revision: 1129522

URL: http://svn.apache.org/viewvc?rev=1129522&view=rev
Log:
String utilities for byte array to hex conversion.

Added:
    jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/util/StringUtils.java

Added: jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/util/StringUtils.java
URL: http://svn.apache.org/viewvc/jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/util/StringUtils.java?rev=1129522&view=auto
==============================================================================
--- jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/util/StringUtils.java (added)
+++ jackrabbit/sandbox/microkernel/src/main/java/org/apache/jackrabbit/mk/util/StringUtils.java Tue May 31 07:40:37 2011
@@ -0,0 +1,94 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.jackrabbit.mk.util;
+
+/**
+ * Some string utility methods.
+ */
+public class StringUtils {
+
+    private static final char[] HEX = "0123456789abcdef".toCharArray();
+
+    /**
+     * Convert a byte array to a hex encoded string.
+     *
+     * @param value the byte array
+     * @param len the number of bytes to encode
+     * @return the hex encoded string
+     */
+    public static String convertBytesToHex(byte[] value) {
+        int len = value.length;
+        char[] buff = new char[len + len];
+        char[] hex = HEX;
+        for (int i = 0; i < len; i++) {
+            int c = value[i] & 0xff;
+            buff[i + i] = hex[c >> 4];
+            buff[i + i + 1] = hex[c & 0xf];
+        }
+        return new String(buff);
+    }
+
+    /**
+     * Append a number as two hex digits to the string builder.
+     *
+     * @param buff the string builder
+     * @param x the number to append
+     */
+    public static void appendHex(StringBuilder buff, int x) {
+        buff.append(HEX[x >> 4]).append(HEX[x & 0xf]);
+    }
+
+    /**
+     * Convert a hex encoded string to a byte array.
+     *
+     * @param s the hex encoded string
+     * @return the byte array
+     */
+    public static byte[] convertHexToBytes(String s) {
+        int len = s.length();
+        if (len % 2 != 0) {
+            throw new IllegalArgumentException(s);
+        }
+        len /= 2;
+        byte[] buff = new byte[len];
+        for (int i = 0; i < len; i++) {
+            buff[i] = (byte) ((getHexDigit(s, i + i) << 4) | getHexDigit(s, i + i + 1));
+        }
+        return buff;
+    }
+
+    /**
+     * Convert the digit at the given position to a hex number.
+     *
+     * @param s the hex encoded string
+     * @param i the index
+     * @return the number
+     */
+    public static int getHexDigit(String s, int i) {
+        char c = s.charAt(i);
+        if (c >= '0' && c <= '9') {
+            return c - '0';
+        } else if (c >= 'a' && c <= 'f') {
+            return c - 'a' + 0xa;
+        } else if (c >= 'A' && c <= 'F') {
+            return c - 'A' + 0xa;
+        } else {
+            throw new IllegalArgumentException(s);
+        }
+    }
+
+}