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base64-encode.c

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    base64-encode.c 4.64 KiB
    /* base64-encode.c
     *
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 Niels Möller
     *  
     * The nettle library is free software; you can redistribute it and/or modify
     * it under the terms of the GNU Lesser General Public License as published by
     * the Free Software Foundation; either version 2.1 of the License, or (at your
     * option) any later version.
     * 
     * The nettle library is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
     * License for more details.
     * 
     * You should have received a copy of the GNU Lesser General Public License
     * along with the nettle library; see the file COPYING.LIB.  If not, write to
     * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
     * MA 02111-1301, USA.
     */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    #include <stdlib.h>
    
    #include "base64.h"
    
    static const uint8_t encode_table[64] =
      "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
      "abcdefghijklmnopqrstuvwxyz"
      "0123456789+/";
    
    #define ENCODE(x) (encode_table[0x3F & (x)])
    
    void
    base64_encode_raw(uint8_t *dst, unsigned length, const uint8_t *src)
    {
      const uint8_t *in = src + length;
      uint8_t *out = dst + BASE64_ENCODE_RAW_LENGTH(length);
    
      unsigned left_over = length % 3;
    
      if (left_over)
        {
          in -= left_over;
          *--out = '=';
          switch(left_over)
    	{
    	case 1:
    	  *--out = '=';
    	  *--out = ENCODE(in[0] << 4);
    	  break;
    	  
    	case 2:
    	  *--out = ENCODE( in[1] << 2);
    	  *--out = ENCODE((in[0] << 4) | (in[1] >> 4));
    	  break;
    
    	default:
    	  abort();
    	}
          *--out = ENCODE(in[0] >> 2);
        }