/client/android/src/org/xmlrpc/android/Base64Coder.java
Java | 307 lines | 135 code | 18 blank | 154 comment | 33 complexity | 687682e6408cf3a1719336d66b86c63c MD5 | raw file
Possible License(s): Apache-2.0
- // Copyright 2003-2010 Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland
- // www.source-code.biz, www.inventec.ch/chdh
- //
- // This module is multi-licensed and may be used under the terms
- // of any of the following licenses:
- //
- // EPL, Eclipse Public License, http://www.eclipse.org/legal
- // LGPL, GNU Lesser General Public License, http://www.gnu.org/licenses/lgpl.html
- // AL, Apache License, http://www.apache.org/licenses
- // BSD, BSD License, http://www.opensource.org/licenses/bsd-license.php
- //
- // Please contact the author if you need another license.
- // This module is provided "as is", without warranties of any kind.
-
- package org.xmlrpc.android;
-
- /**
- * A Base64 encoder/decoder.
- *
- * <p>
- * This class is used to encode and decode data in Base64 format as described in
- * RFC 1521.
- *
- * <p>
- * Project home page: <a
- * href="http://www.source-code.biz/base64coder/java/">www.
- * source-code.biz/base64coder/java</a><br>
- * Author: Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland<br>
- * Multi-licensed: EPL / LGPL / AL / BSD.
- */
- public class Base64Coder {
-
- // The line separator string of the operating system.
- private static final String systemLineSeparator = System
- .getProperty("line.separator");
-
- // Mapping table from 6-bit nibbles to Base64 characters.
- private static char[] map1 = new char[64];
- static {
- int i = 0;
- for (char c = 'A'; c <= 'Z'; c++)
- map1[i++] = c;
- for (char c = 'a'; c <= 'z'; c++)
- map1[i++] = c;
- for (char c = '0'; c <= '9'; c++)
- map1[i++] = c;
- map1[i++] = '+';
- map1[i++] = '/';
- }
-
- // Mapping table from Base64 characters to 6-bit nibbles.
- private static byte[] map2 = new byte[128];
- static {
- for (int i = 0; i < map2.length; i++)
- map2[i] = -1;
- for (int i = 0; i < 64; i++)
- map2[map1[i]] = (byte) i;
- }
-
- /**
- * Encodes a string into Base64 format. No blanks or line breaks are
- * inserted.
- *
- * @param s
- * A String to be encoded.
- * @return A String containing the Base64 encoded data.
- */
- public static String encodeString(String s) {
- return new String(encode(s.getBytes()));
- }
-
- /**
- * Encodes a byte array into Base 64 format and breaks the output into lines
- * of 76 characters. This method is compatible with
- * <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>.
- *
- * @param in
- * An array containing the data bytes to be encoded.
- * @return A String containing the Base64 encoded data, broken into lines.
- */
- public static String encodeLines(byte[] in) {
- return encodeLines(in, 0, in.length, 76, systemLineSeparator);
- }
-
- /**
- * Encodes a byte array into Base 64 format and breaks the output into
- * lines.
- *
- * @param in
- * An array containing the data bytes to be encoded.
- * @param iOff
- * Offset of the first byte in <code>in</code> to be processed.
- * @param iLen
- * Number of bytes to be processed in <code>in</code>, starting
- * at <code>iOff</code>.
- * @param lineLen
- * Line length for the output data. Should be a multiple of 4.
- * @param lineSeparator
- * The line separator to be used to separate the output lines.
- * @return A String containing the Base64 encoded data, broken into lines.
- */
- public static String encodeLines(byte[] in, int iOff, int iLen,
- int lineLen, String lineSeparator) {
- int blockLen = (lineLen * 3) / 4;
- if (blockLen <= 0)
- throw new IllegalArgumentException();
- int lines = (iLen + blockLen - 1) / blockLen;
- int bufLen = ((iLen + 2) / 3) * 4 + lines * lineSeparator.length();
- StringBuilder buf = new StringBuilder(bufLen);
- int ip = 0;
- while (ip < iLen) {
- int l = Math.min(iLen - ip, blockLen);
- buf.append(encode(in, iOff + ip, l));
- buf.append(lineSeparator);
- ip += l;
- }
- return buf.toString();
- }
-
- /**
- * Encodes a byte array into Base64 format. No blanks or line breaks are
- * inserted in the output.
- *
- * @param in
- * An array containing the data bytes to be encoded.
- * @return A character array containing the Base64 encoded data.
- */
- public static char[] encode(byte[] in) {
- return encode(in, 0, in.length);
- }
-
- /**
- * Encodes a byte array into Base64 format. No blanks or line breaks are
- * inserted in the output.
- *
- * @param in
- * An array containing the data bytes to be encoded.
- * @param iLen
- * Number of bytes to process in <code>in</code>.
- * @return A character array containing the Base64 encoded data.
- */
- public static char[] encode(byte[] in, int iLen) {
- return encode(in, 0, iLen);
- }
-
- /**
- * Encodes a byte array into Base64 format. No blanks or line breaks are
- * inserted in the output.
- *
- * @param in
- * An array containing the data bytes to be encoded.
- * @param iOff
- * Offset of the first byte in <code>in</code> to be processed.
- * @param iLen
- * Number of bytes to process in <code>in</code>, starting at
- * <code>iOff</code>.
- * @return A character array containing the Base64 encoded data.
- */
- public static char[] encode(byte[] in, int iOff, int iLen) {
- int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
- int oLen = ((iLen + 2) / 3) * 4; // output length including padding
- char[] out = new char[oLen];
- int ip = iOff;
- int iEnd = iOff + iLen;
- int op = 0;
- while (ip < iEnd) {
- int i0 = in[ip++] & 0xff;
- int i1 = ip < iEnd ? in[ip++] & 0xff : 0;
- int i2 = ip < iEnd ? in[ip++] & 0xff : 0;
- int o0 = i0 >>> 2;
- int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
- int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
- int o3 = i2 & 0x3F;
- out[op++] = map1[o0];
- out[op++] = map1[o1];
- out[op] = op < oDataLen ? map1[o2] : '=';
- op++;
- out[op] = op < oDataLen ? map1[o3] : '=';
- op++;
- }
- return out;
- }
-
- /**
- * Decodes a string from Base64 format. No blanks or line breaks are allowed
- * within the Base64 encoded input data.
- *
- * @param s
- * A Base64 String to be decoded.
- * @return A String containing the decoded data.
- * @throws IllegalArgumentException
- * If the input is not valid Base64 encoded data.
- */
- public static String decodeString(String s) {
- return new String(decode(s));
- }
-
- /**
- * Decodes a byte array from Base64 format and ignores line separators, tabs
- * and blanks. CR, LF, Tab and Space characters are ignored in the input
- * data. This method is compatible with
- * <code>sun.misc.BASE64Decoder.decodeBuffer(String)</code>.
- *
- * @param s
- * A Base64 String to be decoded.
- * @return An array containing the decoded data bytes.
- * @throws IllegalArgumentException
- * If the input is not valid Base64 encoded data.
- */
- public static byte[] decodeLines(String s) {
- char[] buf = new char[s.length()];
- int p = 0;
- for (int ip = 0; ip < s.length(); ip++) {
- char c = s.charAt(ip);
- if (c != ' ' && c != '\r' && c != '\n' && c != '\t')
- buf[p++] = c;
- }
- return decode(buf, 0, p);
- }
-
- /**
- * Decodes a byte array from Base64 format. No blanks or line breaks are
- * allowed within the Base64 encoded input data.
- *
- * @param s
- * A Base64 String to be decoded.
- * @return An array containing the decoded data bytes.
- * @throws IllegalArgumentException
- * If the input is not valid Base64 encoded data.
- */
- public static byte[] decode(String s) {
- return decode(s.toCharArray());
- }
-
- /**
- * Decodes a byte array from Base64 format. No blanks or line breaks are
- * allowed within the Base64 encoded input data.
- *
- * @param in
- * A character array containing the Base64 encoded data.
- * @return An array containing the decoded data bytes.
- * @throws IllegalArgumentException
- * If the input is not valid Base64 encoded data.
- */
- public static byte[] decode(char[] in) {
- return decode(in, 0, in.length);
- }
-
- /**
- * Decodes a byte array from Base64 format. No blanks or line breaks are
- * allowed within the Base64 encoded input data.
- *
- * @param in
- * A character array containing the Base64 encoded data.
- * @param iOff
- * Offset of the first character in <code>in</code> to be
- * processed.
- * @param iLen
- * Number of characters to process in <code>in</code>, starting
- * at <code>iOff</code>.
- * @return An array containing the decoded data bytes.
- * @throws IllegalArgumentException
- * If the input is not valid Base64 encoded data.
- */
- public static byte[] decode(char[] in, int iOff, int iLen) {
- if (iLen % 4 != 0)
- throw new IllegalArgumentException(
- "Length of Base64 encoded input string is not a multiple of 4.");
- while (iLen > 0 && in[iOff + iLen - 1] == '=')
- iLen--;
- int oLen = (iLen * 3) / 4;
- byte[] out = new byte[oLen];
- int ip = iOff;
- int iEnd = iOff + iLen;
- int op = 0;
- while (ip < iEnd) {
- int i0 = in[ip++];
- int i1 = in[ip++];
- int i2 = ip < iEnd ? in[ip++] : 'A';
- int i3 = ip < iEnd ? in[ip++] : 'A';
- if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
- throw new IllegalArgumentException(
- "Illegal character in Base64 encoded data.");
- int b0 = map2[i0];
- int b1 = map2[i1];
- int b2 = map2[i2];
- int b3 = map2[i3];
- if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
- throw new IllegalArgumentException(
- "Illegal character in Base64 encoded data.");
- int o0 = (b0 << 2) | (b1 >>> 4);
- int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
- int o2 = ((b2 & 3) << 6) | b3;
- out[op++] = (byte) o0;
- if (op < oLen)
- out[op++] = (byte) o1;
- if (op < oLen)
- out[op++] = (byte) o2;
- }
- return out;
- }
-
- // Dummy constructor.
- private Base64Coder() {
- }
-
- } // end class Base64Coder