gt: 		byte[] dArr = new byte[dLen];
context: package com.robertszkutak.androidexamples.imgurexample;
  
  import java.util.Arrays;
  
  /** A very fast and memory efficient class to encode and decode to and from BASE64 in full accordance
   * with RFC 2045.<br><br>
   * On Windows XP sp1 with 1.4.2_04 and later ;), this encoder and decoder is about 10 times faster
   * on small arrays (10 - 1000 bytes) and 2-3 times as fast on larger arrays (10000 - 1000000 bytes)
   * compared to <code>sun.misc.Encoder()/Decoder()</code>.<br><br>
   *
   * On byte arrays the encoder is about 20% faster than Jakarta Commons Base64 Codec for encode and
   * about 50% faster for decoding large arrays. This implementation is about twice as fast on very small
   * arrays (&lt 30 bytes). If source/destination is a <code>String</code> this
   * version is about three times as fast due to the fact that the Commons Codec result has to be recoded
   * to a <code>String</code> from <code>byte[]</code>, which is very expensive.<br><br>
   *
   * This encode/decode algorithm doesn't create any temporary arrays as many other codecs do, it only
   * allocates the resulting array. This produces less garbage and it is possible to handle arrays twice
   * as large as algorithms that create a temporary array. (E.g. Jakarta Commons Codec). It is unknown
   * whether Sun's <code>sun.misc.Encoder()/Decoder()</code> produce temporary arrays but since performance
   * is quite low it probably does.<br><br>
   *
   * The encoder produces the same output as the Sun one except that the Sun's encoder appends
   * a trailing line separator if the last character isn't a pad. Unclear why but it only adds to the
   * length and is probably a side effect. Both are in conformance with RFC 2045 though.<br>
   * Commons codec seem to always att a trailing line separator.<br><br>
   *
   * <b>Note!</b>
   * The encode/decode method pairs (types) come in three versions with the <b>exact</b> same algorithm and
   * thus a lot of code redundancy. This is to not create any temporary arrays for transcoding to/from different
   * format types. The methods not used can simply be commented out.<br><br>
   *
   * There is also a "fast" version of all decode methods that works the same way as the normal ones, but
   * har a few demands on the decoded input. Normally though, these fast verions should be used if the source if
   * the input is known and it hasn't bee tampered with.<br><br>
   *
   * If you find the code useful or you find a bug, please send me a note at base64 @ miginfocom . com.
   *
   * Licence (BSD):
   * ==============
   *
   * Copyright (c) 2004, Mikael Grev, MiG InfoCom AB. (base64 @ miginfocom . com)
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   * Redistributions of source code must retain the above copyright notice, this list
   * of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright notice, this
   * list of conditions and the following disclaimer in the documentation and/or other
   * materials provided with the distribution.
   * Neither the name of the MiG InfoCom AB nor the names of its contributors may be
   * used to endorse or promote products derived from this software without specific
   * prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
   * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   * OF SUCH DAMAGE.
   *
   * @version 2.2
   * @author Mikael Grev
   *         Date: 2004-aug-02
   *         Time: 11:31:11
   */
  
  public class Base64
  {
  	private static final char[] CA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
  	private static final int[] IA = new int[256];
  	static {
  		Arrays.fill(IA, -1);
  		for (int i = 0, iS = CA.length; i < iS; i++)
  			IA[CA[i]] = i;
  		IA['='] = 0;
  	}
  
  	// ****************************************************************************************
  	// *  char[] version
  	// ****************************************************************************************
  
  	/** Encodes a raw byte array into a BASE64 <code>char[]</code> representation i accordance with RFC 2045.
  	 * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
  	 * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
  	 * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
  	 * little faster.
  	 * @return A BASE64 encoded array. Never <code>null</code>.
  	 */
  	public final static char[] encodeToChar(byte[] sArr, boolean lineSep)
  	{
  		// Check special case
  		int sLen = sArr != null ? sArr.length : 0;
  		if (sLen == 0)
  			return new char[0];
  
  		int eLen = (sLen / 3) * 3;              // Length of even 24-bits.
  		int cCnt = ((sLen - 1) / 3 + 1) << 2;   // Returned character count
  		int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned array
  		char[] dArr = new char[dLen];
  
  		// Encode even 24-bits
  		for (int s = 0, d = 0, cc = 0; s < eLen;) {
  			// Copy next three bytes into lower 24 bits of int, paying attension to sign.
  			int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
  
  			// Encode the int into four chars
  			dArr[d++] = CA[(i >>> 18) & 0x3f];
  			dArr[d++] = CA[(i >>> 12) & 0x3f];
  			dArr[d++] = CA[(i >>> 6) & 0x3f];
  			dArr[d++] = CA[i & 0x3f];
  
  			// Add optional line separator
  			if (lineSep && ++cc == 19 && d < dLen - 2) {
  				dArr[d++] = '\r';
  				dArr[d++] = '\n';
  				cc = 0;
  			}
  		}
  
  		// Pad and encode last bits if source isn't even 24 bits.
  		int left = sLen - eLen; // 0 - 2.
  		if (left > 0) {
  			// Prepare the int
  			int i = ((sArr[eLen] & 0xff) << 10) | (left == 2 ? ((sArr[sLen - 1] & 0xff) << 2) : 0);
  
  			// Set last four chars
  			dArr[dLen - 4] = CA[i >> 12];
  			dArr[dLen - 3] = CA[(i >>> 6) & 0x3f];
  			dArr[dLen - 2] = left == 2 ? CA[i & 0x3f] : '=';
  			dArr[dLen - 1] = '=';
  		}
  		return dArr;
  	}
  
  	/** Decodes a BASE64 encoded char array. All illegal characters will be ignored and can handle both arrays with
  	 * and without line separators.
  	 * @param sArr The source array. <code>null</code> or length 0 will return an empty array.
  	 * @return The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
  	 * (including '=') isn't divideable by 4.  (I.e. definitely corrupted).
  	 */
  	public final static byte[] decode(char[] sArr)
  	{
  		// Check special case
  		int sLen = sArr != null ? sArr.length : 0;
  		if (sLen == 0)
  			return new byte[0];
  
  		// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
  		// so we don't have to reallocate & copy it later.
  		int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
  		for (int i = 0; i < sLen; i++)  // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
  			if (IA[sArr[i]] < 0)
  				sepCnt++;
  
  		// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
  		if ((sLen - sepCnt) % 4 != 0)
  			return null;
  
  		int pad = 0;
  		for (int i = sLen; i > 1 && IA[sArr[--i]] <= 0;)
  			if (sArr[i] == '=')
  				pad++;
  
  		int len = ((sLen - sepCnt) * 6 >> 3) - pad;
  
  		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
  
  		for (int s = 0, d = 0; d < len;) {
  			// Assemble three bytes into an int from four "valid" characters.
  			int i = 0;
  			for (int j = 0; j < 4; j++) {   // j only increased if a valid char was found.
  				int c = IA[sArr[s++]];
  				if (c >= 0)
  				    i |= c << (18 - j * 6);
  				else
  					j--;
  			}
  			// Add the bytes
  			dArr[d++] = (byte) (i >> 16);
  			if (d < len) {
  				dArr[d++]= (byte) (i >> 8);
  				if (d < len)
  					dArr[d++] = (byte) i;
  			}
  		}
  		return dArr;
  	}
  
  	/** Decodes a BASE64 encoded char array that is known to be resonably well formatted. The method is about twice as
  	 * fast as {@link #decode(char[])}. The preconditions are:<br>
  	 * + The array must have a line length of 76 chars OR no line separators at all (one line).<br>
  	 * + Line separator must be "\r\n", as specified in RFC 2045
  	 * + The array must not contain illegal characters within the encoded string<br>
  	 * + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br>
  	 * @param sArr The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.
  	 * @return The decoded array of bytes. May be of length 0.
  	 */
  	public final static byte[] decodeFast(char[] sArr)
  	{
  		// Check special case
  		int sLen = sArr.length;
  		if (sLen == 0)
  			return new byte[0];
  
  		int sIx = 0, eIx = sLen - 1;    // Start and end index after trimming.
  
  		// Trim illegal chars from start
  		while (sIx < eIx && IA[sArr[sIx]] < 0)
  			sIx++;
  
  		// Trim illegal chars from end
  		while (eIx > 0 && IA[sArr[eIx]] < 0)
  			eIx--;
  
  		// get the padding count (=) (0, 1 or 2)
  		int pad = sArr[eIx] == '=' ? (sArr[eIx - 1] == '=' ? 2 : 1) : 0;  // Count '=' at end.
  		int cCnt = eIx - sIx + 1;   // Content count including possible separators
  		int sepCnt = sLen > 76 ? (sArr[76] == '\r' ? cCnt / 78 : 0) << 1 : 0;
  
  		int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
  		byte[] dArr = new byte[len];       // Preallocate byte[] of exact length
  
  		// Decode all but the last 0 - 2 bytes.
  		int d = 0;
  		for (int cc = 0, eLen = (len / 3) * 3; d < eLen;) {
  			// Assemble three bytes into an int from four "valid" characters.
  			int i = IA[sArr[sIx++]] << 18 | IA[sArr[sIx++]] << 12 | IA[sArr[sIx++]] << 6 | IA[sArr[sIx++]];
  
  			// Add the bytes
  			dArr[d++] = (byte) (i >> 16);
  			dArr[d++] = (byte) (i >> 8);
  			dArr[d++] = (byte) i;
  
  			// If line separator, jump over it.
  			if (sepCnt > 0 && ++cc == 19) {
  				sIx += 2;
  				cc = 0;
  			}
  		}
  
  		if (d < len) {
  			// Decode last 1-3 bytes (incl '=') into 1-3 bytes
  			int i = 0;
  			for (int j = 0; sIx <= eIx - pad; j++)
  				i |= IA[sArr[sIx++]] << (18 - j * 6);
  
  			for (int r = 16; d < len; r -= 8)
  				dArr[d++] = (byte) (i >> r);
  		}
  
  		return dArr;
  	}
  
  	// ****************************************************************************************
  	// *  byte[] version
  	// ****************************************************************************************
  
  	/** Encodes a raw byte array into a BASE64 <code>byte[]</code> representation i accordance with RFC 2045.
  	 * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
  	 * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
  	 * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
  	 * little faster.
  	 * @return A BASE64 encoded array. Never <code>null</code>.
  	 */
  	public final static byte[] encodeToByte(byte[] sArr, boolean lineSep)
  	{
  		// Check special case
  		int sLen = sArr != null ? sArr.length : 0;
  		if (sLen == 0)
  			return new byte[0];
  
  		int eLen = (sLen / 3) * 3;                              // Length of even 24-bits.
  		int cCnt = ((sLen - 1) / 3 + 1) << 2;                   // Returned character count
  		int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned array
  