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Subject: svn commit: r789418 -
 /commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/util/Base64.java
Date: Mon, 29 Jun 2009 19:34:59 -0000
To: commits@commons.apache.org
From: mturk@apache.org
Message-Id: <20090629193459.2433923888E7@eris.apache.org>

Author: mturk
Date: Mon Jun 29 19:34:58 2009
New Revision: 789418

URL: http://svn.apache.org/viewvc?rev=789418&view=rev
Log:
Add full Base64 decode/encode

Added:
    commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/util/Base64.java   (with props)

Added: commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/util/Base64.java
URL: http://svn.apache.org/viewvc/commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/util/Base64.java?rev=789418&view=auto
==============================================================================
--- commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/util/Base64.java (added)
+++ commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/util/Base64.java Mon Jun 29 19:34:58 2009
@@ -0,0 +1,323 @@
+/* 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.commons.runtime.util;
+
+import java.io.UnsupportedEncodingException;
+
+/**
+ * Base64 encoding enumeration
+ *
+ * @author Mladen Turk
+ *
+ */
+public class Base64
+{
+
+    private Base64()
+    {
+        // Disable creation
+    }
+
+    /**
+     * Wrap encoded lines after {@code COLS} character {@code (default 72)}.
+     */
+    public  static final int    COLS    = 72;
+    private static final char   padding = '=';
+    private static final char[] basis64 = {
+        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
+        'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
+        'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
+        'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+        'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
+        'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
+        '8', '9', '+', '/'
+    };
+
+    // ASCII table
+    private static final byte[] pr2six = {
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
+        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
+        64,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
+        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
+        64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+        41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+        64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
+    };
+
+    /**
+     * Calculate number of bytes needed to {@code Base64} encode
+     * the {@code src} array.
+     *
+     * @param src byte array to encode.
+     * @param srcPos offset from the start of the {@code data} byte array.
+     * @param len length in the {@code src} byte array.
+     * @param wrap Wrap encoded lines after {@code wrap} character.
+     *        Use {@code 0} to disable line wrapping.
+     *
+     * @return length needed to {@code Base64} encode the array.
+     */
+    public static int encodeLength(byte[] src, int srcPos, int len,
+                                   int wrap)
+    {
+        int dstlen;
+
+        dstlen = (((len + 2) / 3) * 4);
+        if (wrap == -1)
+            wrap = COLS;
+        if (wrap > 0)
+            dstlen += (dstlen / wrap);
+
+        return dstlen;
+    }
+
+    public static int encode(byte[] src, int srcPos, byte[] dst,
+                             int dstPos, int len, int wrap)
+        throws IndexOutOfBoundsException, NullPointerException
+    {
+        int oc = 0;
+        int dp = dstPos;
+        int sc = srcPos;
+        int dl = dst.length;
+        int i;
+        int[] inp = new int[3];
+        int[] out = new int[4];
+
+        if (wrap == -1)
+            wrap = COLS;
+        while (len >= 3) {
+            inp[0] = (int)src[sc++] & 0xFF;
+            inp[1] = (int)src[sc++] & 0xFF;
+            inp[2] = (int)src[sc++] & 0xFF;
+            len   -= 3;
+
+            out[0] = ((inp[0] >> 2));
+            out[1] = ((inp[0] & 0x03) << 4) + (inp[1] >> 4);
+            out[2] = ((inp[1] & 0x0F) << 2) + (inp[2] >> 6);
+            out[3] = ((inp[2] & 0x3F));
+
+            if (dp + 4 > dl)
+                throw new IndexOutOfBoundsException("Destination is too small");
+            dst[dp++] = (byte)basis64[out[0]];
+            dst[dp++] = (byte)basis64[out[1]];
+            dst[dp++] = (byte)basis64[out[2]];
+            dst[dp++] = (byte)basis64[out[3]];
+            if (wrap > 0) {
+                if (++oc % (wrap / 4) == 0)
+                    dst[dp++] = '\n';
+            }
+        }
+        // Pad with remaining 1 or 2 bytes
+        if (len != 0) {
+            inp[0] = inp[1] = inp[2] = 0;
+            for (i = 0; i < len; i++)
+                inp[i] = (int)src[sc++] & 0xFF;
+
+            out[0] = ((inp[0] >> 2));
+            out[1] = ((inp[0] & 0x03) << 4) + (inp[1] >> 4);
+            out[2] = ((inp[1] & 0x0F) << 2) + (inp[2] >> 6);
+
+            if (dp + 4 > dl)
+                throw new IndexOutOfBoundsException("Destination is too small");
+            dst[dp++] = (byte)basis64[out[0]];
+            dst[dp++] = (byte)basis64[out[1]];
+            if (len == 1)
+                dst[dp++] = padding;
+            else
+                dst[dp++] = (byte)basis64[out[2]];
+            dst[dp++] = padding;
+        }
+        return dp - dstPos;
+    }
+
+    public static int encode(byte[] src, int srcPos, char[] dst,
+                             int dstPos, int len, int wrap)
+        throws IndexOutOfBoundsException, NullPointerException
+    {
+        int oc = 0;
+        int dp = dstPos;
+        int sc = srcPos;
+        int dl = dst.length;
+        int i;
+        int[] inp = new int[3];
+        int[] out = new int[4];
+
+        if (wrap == -1)
+            wrap = COLS;
+        while (len >= 3) {
+            inp[0] = (int)src[sc++] & 0xFF;
+            inp[1] = (int)src[sc++] & 0xFF;
+            inp[2] = (int)src[sc++] & 0xFF;
+            len   -= 3;
+
+            out[0] = ((inp[0] >> 2));
+            out[1] = ((inp[0] & 0x03) << 4) + (inp[1] >> 4);
+            out[2] = ((inp[1] & 0x0F) << 2) + (inp[2] >> 6);
+            out[3] = ((inp[2] & 0x3F));
+
+            if (dp + 4 > dl)
+                throw new IndexOutOfBoundsException("Destination is too small");
+            dst[dp++] = basis64[out[0]];
+            dst[dp++] = basis64[out[1]];
+            dst[dp++] = basis64[out[2]];
+            dst[dp++] = basis64[out[3]];
+            if (wrap > 0) {
+                if (++oc % (wrap / 4) == 0)
+                    dst[dp++] = '\n';
+            }
+        }
+        // Pad with remaining 1 or 2 bytes
+        if (len != 0) {
+            inp[0] = inp[1] = inp[2] = 0;
+            for (i = 0; i < len; i++)
+                inp[i] = (int)src[sc++] & 0xFF;
+
+            out[0] = ((inp[0] >> 2));
+            out[1] = ((inp[0] & 0x03) << 4) + (inp[1] >> 4);
+            out[2] = ((inp[1] & 0x0F) << 2) + (inp[2] >> 6);
+
+            if (dp + 4 > dl)
+                throw new IndexOutOfBoundsException("Destination is too small");
+            dst[dp++] = basis64[out[0]];
+            dst[dp++] = basis64[out[1]];
+            if (len == 1)
+                dst[dp++] = padding;
+            else
+                dst[dp++] = basis64[out[2]];
+            dst[dp++] = padding;
+        }
+        return dp - dstPos;
+    }
+
+    /**
+     * Encode String using Base64 encoding.
+     * <p>
+     * Input string is encoded from the {@code ISO 8859-1} charset.
+     * </p>
+     *
+     * @param string String to encode.
+     * @param wrap Wrap encoded lines after {@code wrap} character.
+     *        Use {@code 0} to disable line wrapping.
+     * @return {@code base64} encoded String.
+     */
+    public static String encode(String string, int wrap)
+    {
+        try {
+            byte [] data = string.getBytes("8859_1");
+            char [] dest = new char[encodeLength(data, 0, data.length, 0)];
+
+            int nencoded = encode(data, 0, dest, 0, data.length, 0);
+            return new String(dest, 0, nencoded);
+        } catch (UnsupportedEncodingException e) {
+            return "";
+        }
+    }
+
+    /**
+     * Encode String using Base64 encoding.
+     * <p>
+     * Input string is encoded from the {@code ISO 8859-1} charset
+     * and wrapped on {@code COLS} characters.
+     * </p>
+     *
+     * @param string String to encode.
+     * @return {@code base64} encoded String.
+     */
+    public static String encode(String string)
+    {
+        return encode(string, COLS);
+    }
+
+    /**
+     * Calculate number of bytes needed to {@code Base64} decode
+     * the {@code src} array.
+     *
+     * @param src byte array to decode.
+     * @param srcPos offset from the start of the {@code data} byte array.
+     * @param len length in the {@code src} byte array.
+     *
+     * @return length needed to {@code Base64} decode the array.
+     */
+    public static int decodeLength(byte[] src, int srcPos, int len)
+    {
+        int sc = 0;
+        int nprbytes;
+
+        while (sc < len && pr2six[(int)src[srcPos + sc++] & 0xFF] <= 63);
+
+        nprbytes = sc - 1;
+        return ((nprbytes + 3) / 4) * 3;
+    }
+
+    public static int decode(byte[] src, int srcPos, byte[] dst,
+                             int dstPos, int len)
+        throws IndexOutOfBoundsException, NullPointerException
+    {
+        int nd;
+        int sc = 0;
+        int sp = srcPos;
+        int dp = dstPos;
+        int nprbytes;
+
+        while (sc < len && pr2six[(int)src[srcPos + sc++] & 0xFF] <= 63);
+
+        nprbytes = sc - 1;
+        nd = ((nprbytes + 3) / 4) * 3;
+
+        while (nprbytes > 4) {
+            dst[dp++] = (byte)(pr2six[src[sp + 0]] << 2 | pr2six[src[sp + 1]] >> 4);
+            dst[dp++] = (byte)(pr2six[src[sp + 1]] << 4 | pr2six[src[sp + 2]] >> 2);
+            dst[dp++] = (byte)(pr2six[src[sp + 2]] << 6 | pr2six[src[sp + 3]]);
+            sp += 4;
+            nprbytes -= 4;
+        }
+
+        /* Note: (nprbytes == 1) would be an error, so just ingore that case */
+        if (nprbytes > 1)
+            dst[dp++] = (byte)(pr2six[src[sp + 0]] << 2 | pr2six[src[sp + 1]] >> 4);
+        if (nprbytes > 2)
+            dst[dp++] = (byte)(pr2six[src[sp + 1]] << 4 | pr2six[src[sp + 2]] >> 2);
+        if (nprbytes > 3)
+            dst[dp++] = (byte)(pr2six[src[sp + 2]] << 6 | pr2six[src[sp + 3]]);
+
+        nd -= (4 - nprbytes) & 3;
+        return nd;
+    }
+
+    public static String decode(String string)
+    {
+        try {
+            byte [] data = string.getBytes("8859_1");
+            byte [] dest = new byte[decodeLength(data, 0, data.length)];
+
+            int ndecoded = decode(data, 0, dest, 0, data.length);
+            return new String(dest, 0, ndecoded);
+        } catch (UnsupportedEncodingException e) {
+            return "";
+        }
+    }
+
+}
+

Propchange: commons/sandbox/runtime/trunk/src/main/java/org/apache/commons/runtime/util/Base64.java
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