gdx/src/com/badlogic/gdx/utils/Base64Coder.java - platform/external/libgdx - Git at Google

 //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, V1.0 or later, http://www.eclipse.org/legal
 //  LGPL, GNU Lesser General Public License, V2.1 or later, http://www.gnu.org/licenses/lgpl.html
 //  GPL, GNU General Public License, V2 or later, http://www.gnu.org/licenses/gpl.html
 //  AL, Apache License, V2.0 or later, 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.
 /**
  * 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 / GPL / AL / BSD.
  *
  * @author Christian d'Heureuse
  * @author vaxquis
  */

 package com.badlogic.gdx.utils;

 public class Base64Coder {
 	public static class CharMap {
 		protected final char[] encodingMap = new char[64];
 		protected final byte[] decodingMap = new byte[128];

 		public CharMap (char char63, char char64) {
 			int i = 0;
 			for (char c = 'A'; c <= 'Z'; c++) {
 				encodingMap[i++] = c;
 			}
 			for (char c = 'a'; c <= 'z'; c++) {
 				encodingMap[i++] = c;
 			}
 			for (char c = '0'; c <= '9'; c++) {
 				encodingMap[i++] = c;
 			}
 			encodingMap[i++] = char63;
 			encodingMap[i++] = char64;
 			for (i = 0; i < decodingMap.length; i++) {
 				decodingMap[i] = -1;
 			}
 			for (i = 0; i < 64; i++) {
 				decodingMap[encodingMap[i]] = (byte)i;
 			}
 		}

 		public byte[] getDecodingMap () {
 			return decodingMap;
 		}

 		public char[] getEncodingMap () {
 			return encodingMap;
 		}
 	}

 	// The line separator string of the operating system.
 	private static final String systemLineSeparator = "\n";

 	public static final CharMap regularMap = new CharMap('+', '/'), urlsafeMap = new CharMap('-', '_');

 	/** 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 encodeString(s, false);
 	}

 	public static String encodeString (String s, boolean useUrlsafeEncoding) {
 		return new String(encode(s.getBytes(), useUrlsafeEncoding ? urlsafeMap.encodingMap : regularMap.encodingMap));
 	}

 	/** 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, regularMap.encodingMap);
 	}

 	public static String encodeLines (byte[] in, int iOff, int iLen, int lineLen, String lineSeparator, CharMap charMap) {
 		return encodeLines(in, iOff, iLen, lineLen, lineSeparator, charMap.encodingMap);
 	}

 	/** 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.
 	 * @param charMap char map to use
 	 * @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, char[] charMap) {
 		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, charMap));
 			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, regularMap.encodingMap);
 	}

 	public static char[] encode (byte[] in, CharMap charMap) {
 		return encode(in, 0, in.length, charMap);
 	}

     public static char[] encode (byte[] in, char[] charMap) {
 		return encode(in, 0, in.length, charMap);
 	}

 	/** 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, regularMap.encodingMap);
 	}

 	public static char[] encode (byte[] in, int iOff, int iLen, CharMap charMap) {
 		return encode(in, iOff, iLen, charMap.encodingMap);
 	}

 	/** 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>.
 	 * @param charMap char map to use
 	 * @return A character array containing the Base64 encoded data. */
 	public static char[] encode (byte[] in, int iOff, int iLen, char[] charMap) {
 		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++] = charMap[o0];
 			out[op++] = charMap[o1];
 			out[op] = op < oDataLen ? charMap[o2] : '=';
 			op++;
 			out[op] = op < oDataLen ? charMap[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 decodeString(s, false);
 	}

 	public static String decodeString (String s, boolean useUrlSafeEncoding) {
 		return new String(decode(s.toCharArray(), useUrlSafeEncoding ? urlsafeMap.decodingMap : regularMap.decodingMap));
 	}

     public static byte[] decodeLines (String s) {
         return decodeLines(s, regularMap.decodingMap);
     }

     public static byte[] decodeLines (String s, CharMap inverseCharMap) {
         return decodeLines(s, inverseCharMap.decodingMap);
     }

 	/** 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.
      * @param inverseCharMap
 	 * @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, byte[] inverseCharMap) {
 		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, inverseCharMap);
 	}

 	/** 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 s A Base64 String to be decoded.
 	 * @param inverseCharMap
 	 * @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, CharMap inverseCharMap) {
 		return decode(s.toCharArray(), inverseCharMap);
 	}

     public static byte[] decode (char[] in, byte[] inverseCharMap) {
 		return decode(in, 0, in.length, inverseCharMap);
 	}

 	public static byte[] decode (char[] in, CharMap inverseCharMap) {
 		return decode(in, 0, in.length, inverseCharMap);
 	}

 	/** 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, regularMap.decodingMap);
 	}

 	public static byte[] decode (char[] in, int iOff, int iLen, CharMap inverseCharMap) {
 		return decode(in, iOff, iLen, inverseCharMap.decodingMap);
 	}

 	/** 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>.
 	 * @param inverseCharMap charMap to use
 	 * @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, byte[] inverseCharMap) {
 		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 = inverseCharMap[i0];
 			int b1 = inverseCharMap[i1];
 			int b2 = inverseCharMap[i2];
 			int b3 = inverseCharMap[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 () {
 	}
 }
	//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, V1.0 or later, http://www.eclipse.org/legal
	// LGPL, GNU Lesser General Public License, V2.1 or later, http://www.gnu.org/licenses/lgpl.html
	// GPL, GNU General Public License, V2 or later, http://www.gnu.org/licenses/gpl.html
	// AL, Apache License, V2.0 or later, 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.
	/**
	* 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 / GPL / AL / BSD.
	*
	* @author Christian d'Heureuse
	* @author vaxquis
	*/

	package com.badlogic.gdx.utils;

	public class Base64Coder {
	public static class CharMap {
	protected final char[] encodingMap = new char[64];
	protected final byte[] decodingMap = new byte[128];

	public CharMap (char char63, char char64) {
	int i = 0;
	for (char c = 'A'; c <= 'Z'; c++) {
	encodingMap[i++] = c;
	}
	for (char c = 'a'; c <= 'z'; c++) {
	encodingMap[i++] = c;
	}
	for (char c = '0'; c <= '9'; c++) {
	encodingMap[i++] = c;
	}
	encodingMap[i++] = char63;
	encodingMap[i++] = char64;
	for (i = 0; i < decodingMap.length; i++) {
	decodingMap[i] = -1;
	}
	for (i = 0; i < 64; i++) {
	decodingMap[encodingMap[i]] = (byte)i;
	}
	}

	public byte[] getDecodingMap () {
	return decodingMap;
	}

	public char[] getEncodingMap () {
	return encodingMap;
	}
	}

	// The line separator string of the operating system.
	private static final String systemLineSeparator = "\n";

	public static final CharMap regularMap = new CharMap('+', '/'), urlsafeMap = new CharMap('-', '_');

	/** 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 encodeString(s, false);
	}

	public static String encodeString (String s, boolean useUrlsafeEncoding) {
	return new String(encode(s.getBytes(), useUrlsafeEncoding ? urlsafeMap.encodingMap : regularMap.encodingMap));
	}

	/** 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, regularMap.encodingMap);
	}

	public static String encodeLines (byte[] in, int iOff, int iLen, int lineLen, String lineSeparator, CharMap charMap) {
	return encodeLines(in, iOff, iLen, lineLen, lineSeparator, charMap.encodingMap);
	}

	/** 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.
	* @param charMap char map to use
	* @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, char[] charMap) {
	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, charMap));
	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, regularMap.encodingMap);
	}

	public static char[] encode (byte[] in, CharMap charMap) {
	return encode(in, 0, in.length, charMap);
	}

	public static char[] encode (byte[] in, char[] charMap) {
	return encode(in, 0, in.length, charMap);
	}

	/** 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, regularMap.encodingMap);
	}

	public static char[] encode (byte[] in, int iOff, int iLen, CharMap charMap) {
	return encode(in, iOff, iLen, charMap.encodingMap);
	}

	/** 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>.
	* @param charMap char map to use
	* @return A character array containing the Base64 encoded data. */
	public static char[] encode (byte[] in, int iOff, int iLen, char[] charMap) {
	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++] = charMap[o0];
	out[op++] = charMap[o1];
	out[op] = op < oDataLen ? charMap[o2] : '=';
	op++;
	out[op] = op < oDataLen ? charMap[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 decodeString(s, false);
	}

	public static String decodeString (String s, boolean useUrlSafeEncoding) {
	return new String(decode(s.toCharArray(), useUrlSafeEncoding ? urlsafeMap.decodingMap : regularMap.decodingMap));
	}

	public static byte[] decodeLines (String s) {
	return decodeLines(s, regularMap.decodingMap);
	}

	public static byte[] decodeLines (String s, CharMap inverseCharMap) {
	return decodeLines(s, inverseCharMap.decodingMap);
	}

	/** 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.
	* @param inverseCharMap
	* @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, byte[] inverseCharMap) {
	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, inverseCharMap);
	}

	/** 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 s A Base64 String to be decoded.
	* @param inverseCharMap
	* @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, CharMap inverseCharMap) {
	return decode(s.toCharArray(), inverseCharMap);
	}

	public static byte[] decode (char[] in, byte[] inverseCharMap) {
	return decode(in, 0, in.length, inverseCharMap);
	}

	public static byte[] decode (char[] in, CharMap inverseCharMap) {
	return decode(in, 0, in.length, inverseCharMap);
	}

	/** 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, regularMap.decodingMap);
	}

	public static byte[] decode (char[] in, int iOff, int iLen, CharMap inverseCharMap) {
	return decode(in, iOff, iLen, inverseCharMap.decodingMap);
	}

	/** 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>.
	* @param inverseCharMap charMap to use
	* @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, byte[] inverseCharMap) {
	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 = inverseCharMap[i0];
	int b1 = inverseCharMap[i1];
	int b2 = inverseCharMap[i2];
	int b3 = inverseCharMap[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 () {
	}
	}