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41 results

fat-x86_64.c

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  • base64.c 4.05 KiB
    /* base64.c
     *
     * Base64 "ASCII armor" codec.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 Niels Mller, Dan Egnor
     *  
     * 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., 59 Temple Place - Suite 330, Boston,
     * MA 02111-1307, USA.
     */
    
    #include "base64.h"
    
    #include <assert.h>
    
    #define TABLE_INVALID -1
    #define TABLE_SPACE -2
    #define TABLE_END -3
    
    static const uint8_t encode_table[64] =
      "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
      "abcdefghijklmnopqrstuvwxyz"
      "0123456789+/";
    
    static const signed char decode_table[256] =
    {
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1, 
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
      52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -3, -1, -1,
      -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
      15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
      -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
      41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    };
    
    unsigned 
    base64_encode(uint8_t *dst,
                  unsigned src_length,
                  const uint8_t *src)
    {
      uint8_t *out = dst;
    
      while (src_length >= 3)
        {
          *out++ = encode_table[0x3F &  (src[0] >> 2)];
          *out++ = encode_table[0x3F & ((src[0] << 4) | (src[1] >> 4))];
          *out++ = encode_table[0x3F & ((src[1] << 2) | (src[2] >> 6))];
          *out++ = encode_table[0x3F &   src[2]];
          src += 3;
          src_length -= 3;
        }
    
      switch (src_length) 
        {
        case 2:
          *out++ = encode_table[0x3F &  (src[0] >> 2)];
          *out++ = encode_table[0x3F & ((src[0] << 4) | (src[1] >> 4))];
          *out++ = encode_table[0x3F &  (src[1] << 2)];
          *out++ = '=';
          break;
        case 1:
          *out++ = encode_table[0x3F & (src[0] >> 2)];
          *out++ = encode_table[0x3F & (src[0] << 4)];
          *out++ = '=';
          *out++ = '=';
          break;
        case 0:
          break;
        }
    
      return out - dst;
    }
    
    void
    base64_decode_init(struct base64_ctx *ctx)
    {
      ctx->shift = 10;
      ctx->accum = 0;
    }
    
    unsigned
    base64_decode_update(struct base64_ctx *ctx,
                         uint8_t *dst,
                         unsigned src_length,
                         const uint8_t *src)
    {
      uint8_t *out = dst;
    
      for (;;) 
        {
          int data;
          if (src_length == 0) return out - dst;
          data = decode_table[*src];
          switch (data)
            {
            default:
              ctx->accum |= data << ctx->shift;
              ctx->shift -= 6;
              if (ctx->shift <= 2)
                {
                  *out++ = ctx->accum >> 8;
                  ctx->accum <<= 8;
                  ctx->shift += 8;
                }
    	  /* Fall through */
            case TABLE_INVALID:
            case TABLE_SPACE:
            case TABLE_END:
    	  /* FIXME: Silently ignores any invalid characters.
    	   * We need to detect and return errors, in some way. */
              ++src;
              --src_length;
            }
        }
    }