A Base64 Encoder/Decoder. : Base64 « Date Type « Android

1. Android
2. Date Type
3. Base64

A Base64 Encoder/Decoder.

  

//Copyright 2003-2009 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.

/**
 * A Base64 Encoder/Decoder.
 * 
 * <p>
 * This class is used to encode and decode data in Base64 format as described in RFC 1521.
 * 
 * <p>
 * Home page: <a href="http://www.source-code.biz">www.source-code.biz</a><br>
 * Author: Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland<br>
 * Multi-licensed: EPL/LGPL/AL/BSD.
 * 
 * <p>
 * Version history:<br>
 * 2003-07-22 Christian d'Heureuse (chdh): Module created.<br>
 * 2005-08-11 chdh: Lincense changed from GPL to LGPL.<br>
 * 2006-11-21 chdh:<br>
 * &nbsp; Method encode(String) renamed to encodeString(String).<br>
 * &nbsp; Method decode(String) renamed to decodeString(String).<br>
 * &nbsp; New method encode(byte[],int) added.<br>
 * &nbsp; New method decode(String) added.<br>
 * 2009-07-16: Additional licenses (EPL/AL) added.<br>
 * 2009-09-16: Additional license (BSD) added.<br>
 */
 class Base64Coder {

  //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 with the Base64 encoded data.
   */
  public static String encodeString (String s) {
    return new String(encode(s.getBytes()));
  }
  
  /**
   * Encodes a byte array into Base64 format.
   * No blanks or line breaks are inserted.
   * @param in  an array containing the data bytes to be encoded.
   * @return    A character array with the Base64 encoded data.
   */
  public static char[] encode (byte[] in) {
    return encode(in,in.length);
  }
  
  /**
   * Encodes a byte array into Base64 format.
   * No blanks or line breaks are inserted.
   * @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 with the Base64 encoded data.
   */
  public static char[] encode (byte[] in, 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 = 0;
    int op = 0;
    while (ip < iLen) {
      int i0 = in[ip++] & 0xff;
      int i1 = ip < iLen ? in[ip++] & 0xff : 0;
      int i2 = ip < iLen ? 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.
   * @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.
   * @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 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) {
    int iLen = in.length;
    if (iLen%4 != 0) throw new IllegalArgumentException ("Length of Base64 encoded input string is not a multiple of 4.");
    while (iLen > 0 && in[iLen-1] == '=') iLen--;
    int oLen = (iLen*3) / 4;
    byte[] out = new byte[oLen];
    int ip = 0;
    int op = 0;
    while (ip < iLen) {
      int i0 = in[ip++];
      int i1 = in[ip++];
      int i2 = ip < iLen ? in[ip++] : 'A';
      int i3 = ip < iLen ? 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

   
    
  

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