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       1                 :            : /*
       2                 :            :  * Copyright (c) 2004-2005 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                 :            : 
      35                 :            : #include <config.h>
      36                 :            : #include "roken.h"
      37                 :            : #include <ctype.h>
      38                 :            : #include "hex.h"
      39                 :            : 
      40                 :            : static const char hexchar[16] = "0123456789ABCDEF";
      41                 :            : 
      42                 :            : static int
      43                 :          0 : pos(char c)
      44                 :            : {
      45                 :            :     const char *p;
      46                 :          0 :     c = toupper((unsigned char)c);
      47         [ #  # ]:          0 :     for (p = hexchar; *p; p++)
      48         [ #  # ]:          0 :         if (*p == c)
      49                 :          0 :             return p - hexchar;
      50                 :          0 :     return -1;
      51                 :            : }
      52                 :            : 
      53                 :            : ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
      54                 :          0 : hex_encode(const void *data, size_t size, char **str)
      55                 :            : {
      56                 :          0 :     const unsigned char *q = data;
      57                 :            :     size_t i;
      58                 :            :     char *p;
      59                 :            : 
      60                 :            :     /* check for overflow */
      61         [ #  # ]:          0 :     if (size * 2 < size) {
      62                 :          0 :         *str = NULL;
      63                 :          0 :         return -1;
      64                 :            :     }
      65                 :            : 
      66                 :          0 :     p = malloc(size * 2 + 1);
      67         [ #  # ]:          0 :     if (p == NULL) {
      68                 :          0 :         *str = NULL;
      69                 :          0 :         return -1;
      70                 :            :     }
      71                 :            : 
      72         [ #  # ]:          0 :     for (i = 0; i < size; i++) {
      73                 :          0 :         p[i * 2] = hexchar[(*q >> 4) & 0xf];
      74                 :          0 :         p[i * 2 + 1] = hexchar[*q & 0xf];
      75                 :          0 :         q++;
      76                 :            :     }
      77                 :          0 :     p[i * 2] = '\0';
      78                 :          0 :     *str = p;
      79                 :            : 
      80                 :          0 :     return i * 2;
      81                 :            : }
      82                 :            : 
      83                 :            : ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
      84                 :          0 : hex_decode(const char *str, void *data, size_t len)
      85                 :            : {
      86                 :            :     size_t l;
      87                 :          0 :     unsigned char *p = data;
      88                 :            :     size_t i;
      89                 :            : 
      90                 :          0 :     l = strlen(str);
      91                 :            : 
      92                 :            :     /* check for overflow, same as (l+1)/2 but overflow safe */
      93         [ #  # ]:          0 :     if ((l/2) + (l&1) > len)
      94                 :          0 :         return -1;
      95                 :            : 
      96         [ #  # ]:          0 :     if (l & 1) {
      97                 :          0 :         p[0] = pos(str[0]);
      98                 :          0 :         str++;
      99                 :          0 :         p++;
     100                 :            :     }
     101         [ #  # ]:          0 :     for (i = 0; i < l / 2; i++)
     102                 :          0 :         p[i] = pos(str[i * 2]) << 4 | pos(str[(i * 2) + 1]);
     103                 :          0 :     return i + (l & 1);
     104                 :            : }