lib/base64.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  *  The contents of this file are subject to the Mozilla Public License
   9  *  Version 1.0 (the "License"); you may not use this file except in
  10  *  compliance with the License. You may obtain a copy of the License at
  11  *  http://www.mozilla.org/MPL/
  12  *
  13  *  Software distributed under the License is distributed on an "AS IS"
  14  *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
  15  *  License for the specific language governing rights and limitations
  16  *  under the License.
  17  *
  18  *  The Original Code is Curl.
  19  *
  20  *  The Initial Developer of the Original Code is Daniel Stenberg.
  21  *
  22  *  Portions created by the Initial Developer are Copyright (C) 1998.
  23  *  All Rights Reserved.
  24  *
  25  * ------------------------------------------------------------
  26  * Main author:
  27  * - Daniel Stenberg <Daniel.Stenberg@haxx.nu>
  28  *
  29  *      http://curl.haxx.nu
  30  *
  31  * $Source: /cvsroot/curl/curl/lib/base64.c,v $
  32  * $Revision: 1.1 $
  33  * $Date: 1999-12-29 14:21:17 $
  34  * $Author: bagder $
  35  * $State: Exp $
  36  * $Locker:  $
  37  *
  38  * ------------------------------------------------------------
  39  ****************************************************************************/
  40
  41 #include <stdio.h>
  42
  43 /* ---- Base64 Encoding --- */
  44 static char table64[]=
  45   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  46
  47 void base64Encode(char *intext, char *output)
  48 {
  49   unsigned char ibuf[3];
  50   unsigned char obuf[4];
  51   int i;
  52   int inputparts;
  53
  54   while(*intext) {
  55     for (i = inputparts = 0; i < 3; i++) {
  56       if(*intext) {
  57         inputparts++;
  58         ibuf[i] = *intext;
  59         intext++;
  60       }
  61       else
  62         ibuf[i] = 0;
  63     }
  64
  65     obuf [0] = (ibuf [0] & 0xFC) >> 2;
  66     obuf [1] = ((ibuf [0] & 0x03) << 4) | ((ibuf [1] & 0xF0) >> 4);
  67     obuf [2] = ((ibuf [1] & 0x0F) << 2) | ((ibuf [2] & 0xC0) >> 6);
  68     obuf [3] = ibuf [2] & 0x3F;
  69
  70     switch(inputparts) {
  71     case 1: /* only one byte read */
  72       sprintf(output, "%c%c==",
  73               table64[obuf[0]],
  74               table64[obuf[1]]);
  75       break;
  76     case 2: /* two bytes read */
  77       sprintf(output, "%c%c%c=",
  78               table64[obuf[0]],
  79               table64[obuf[1]],
  80               table64[obuf[2]]);
  81       break;
  82     default:
  83       sprintf(output, "%c%c%c%c",
  84               table64[obuf[0]],
  85               table64[obuf[1]],
  86               table64[obuf[2]],
  87               table64[obuf[3]] );
  88       break;
  89     }
  90     output += 4;
  91   }
  92   *output=0;
  93 }
  94 /* ---- End of Base64 Encoding ---- */