Android Open Source - Rss-App-for-tumblr B A S E64

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License

The source code is released under:

GNU General Public License

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Java Source Code

/**
 * Ace Shooting// ww w  .j a  va  2 s.  c  om
 *
 * Copyright (c) 2010, 2011 Stefan Handschuh
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * (this is an excerpt from BASE64 class of jaolt, except for the license)
 */

package com.aceshooting.rssapp;


public class BASE64 {
  private static char[] TOCHAR = {'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', '+', '/'};
                  
  public static String encode(byte[] bytes) {
    StringBuilder builder = new StringBuilder();
    
    int i = bytes.length;
    
    int k = i/3;

    for (int n = 0; n < k; n++) {
      if (n > 0 && n % 19 == 0) {
        builder.append('\n');
      }
      builder.append(convertToString(bytes[3*n], bytes[3*n+1], bytes[3*n+2]));
    }
    
    k = i % 3;
    if (k == 2) {
      char[] chars = convertToString(bytes[i-2], bytes[i-1], 0);
      
      chars[3] = '=';
      builder.append(chars);
    } else if (k == 1) {
      char[] chars = convertToString(bytes[i-1], 0, 0);
      
      chars[2] = '=';
      chars[3] = '=';
      builder.append(chars);
    }
    return builder.toString();
  }
  
  private static char[] convertToString(int b, int c, int d) {
    char[] result = new char[4];
    if (b < 0) {
      b += 256;
    }
    if (c < 0) {
      c += 256;
    }
    if (d < 0) {
      d += 256;
    }

    int f = d+(c+b*256)*256;

    result[3] = TOCHAR[f % 64];
    f /= 64;
    result[2] = TOCHAR[f % 64];
    f /= 64;
    result[1] = TOCHAR[f % 64];
    f /= 64;
    result[0] = TOCHAR[f % 64];
    
    return result;
  }

}

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