LCOV - code coverage report
Current view: top level - source4/heimdal/lib/roken - base64.c (source / functions) Hit Total Coverage
Test: coverage report for master 6248eab5 Lines: 28 64 43.8 %
Date: 2021-08-25 13:27:56 Functions: 3 4 75.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
       3             :  * (Royal Institute of Technology, Stockholm, Sweden).
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions
       8             :  * are met:
       9             :  *
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  *
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  *
      17             :  * 3. Neither the name of the Institute nor the names of its contributors
      18             :  *    may be used to endorse or promote products derived from this software
      19             :  *    without specific prior written permission.
      20             :  *
      21             :  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
      22             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      23             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      24             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
      25             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      26             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      27             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      29             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      30             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      31             :  * SUCH DAMAGE.
      32             :  */
      33             : 
      34             : #include <config.h>
      35             : 
      36             : #include <stdlib.h>
      37             : #include <string.h>
      38             : #include <limits.h>
      39             : #include "base64.h"
      40             : 
      41             : static const char base64_chars[] =
      42             :     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
      43             : 
      44             : static int
      45      816340 : pos(char c)
      46             : {
      47             :     const char *p;
      48    27342931 :     for (p = base64_chars; *p; p++)
      49    27425995 :         if (*p == c)
      50      899404 :             return p - base64_chars;
      51           0 :     return -1;
      52             : }
      53             : 
      54             : ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
      55           0 : base64_encode(const void *data, int size, char **str)
      56             : {
      57             :     char *s, *p;
      58             :     int i;
      59             :     int c;
      60             :     const unsigned char *q;
      61             : 
      62           0 :     if (size > INT_MAX/4 || size < 0) {
      63           0 :         *str = NULL;
      64           0 :         return -1;
      65             :     }
      66             : 
      67           0 :     p = s = (char *) malloc(size * 4 / 3 + 4);
      68           0 :     if (p == NULL) {
      69           0 :         *str = NULL;
      70           0 :         return -1;
      71             :     }
      72           0 :     q = (const unsigned char *) data;
      73             : 
      74           0 :     for (i = 0; i < size;) {
      75           0 :         c = q[i++];
      76           0 :         c *= 256;
      77           0 :         if (i < size)
      78           0 :             c += q[i];
      79           0 :         i++;
      80           0 :         c *= 256;
      81           0 :         if (i < size)
      82           0 :             c += q[i];
      83           0 :         i++;
      84           0 :         p[0] = base64_chars[(c & 0x00fc0000) >> 18];
      85           0 :         p[1] = base64_chars[(c & 0x0003f000) >> 12];
      86           0 :         p[2] = base64_chars[(c & 0x00000fc0) >> 6];
      87           0 :         p[3] = base64_chars[(c & 0x0000003f) >> 0];
      88           0 :         if (i > size)
      89           0 :             p[3] = '=';
      90           0 :         if (i > size + 1)
      91           0 :             p[2] = '=';
      92           0 :         p += 4;
      93             :     }
      94           0 :     *p = 0;
      95           0 :     *str = s;
      96           0 :     return (int) strlen(s);
      97             : }
      98             : 
      99             : #define DECODE_ERROR 0xffffffff
     100             : 
     101             : static unsigned int
     102      224902 : token_decode(const char *token)
     103             : {
     104             :     int i;
     105      224902 :     unsigned int val = 0;
     106      224902 :     int marker = 0;
     107      224902 :     if (strlen(token) < 4)
     108           0 :         return DECODE_ERROR;
     109     1103738 :     for (i = 0; i < 4; i++) {
     110      899608 :         val *= 64;
     111      899608 :         if (token[i] == '=')
     112         204 :             marker++;
     113      899404 :         else if (marker > 0)
     114           0 :             return DECODE_ERROR;
     115             :         else
     116      899404 :             val += pos(token[i]);
     117             :     }
     118      224902 :     if (marker > 2)
     119           0 :         return DECODE_ERROR;
     120      224902 :     return (marker << 24) | val;
     121             : }
     122             : 
     123             : ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
     124       14118 : base64_decode(const char *str, void *data)
     125             : {
     126             :     const char *p;
     127             :     unsigned char *q;
     128             : 
     129       14118 :     q = data;
     130      239020 :     for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
     131      224902 :         unsigned int val = token_decode(p);
     132      224902 :         unsigned int marker = (val >> 24) & 0xff;
     133      224902 :         if (val == DECODE_ERROR)
     134           0 :             return -1;
     135      224902 :         *q++ = (val >> 16) & 0xff;
     136      224902 :         if (marker < 2)
     137      224846 :             *q++ = (val >> 8) & 0xff;
     138      224902 :         if (marker < 1)
     139      224754 :             *q++ = val & 0xff;
     140             :     }
     141       14118 :     return q - (unsigned char *) data;
     142             : }

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