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104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
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/*
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* Copyright (c) 2004-2005 Kungliga Tekniska H<EFBFBD>gskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: hex.c 16504 2006-01-09 17:09:29Z lha $");
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#endif
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#include "roken.h"
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#include <ctype.h>
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#include "hex.h"
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const static char hexchar[] = "0123456789ABCDEF";
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static int
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pos(char c)
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{
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const char *p;
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c = toupper((unsigned char)c);
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for (p = hexchar; *p; p++)
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if (*p == c)
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return p - hexchar;
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return -1;
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}
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ssize_t ROKEN_LIB_FUNCTION
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hex_encode(const void *data, size_t size, char **str)
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{
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const unsigned char *q = data;
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size_t i;
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char *p;
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/* check for overflow */
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if (size * 2 < size)
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return -1;
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p = malloc(size * 2 + 1);
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if (p == NULL)
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return -1;
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for (i = 0; i < size; i++) {
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p[i * 2] = hexchar[(*q >> 4) & 0xf];
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p[i * 2 + 1] = hexchar[*q & 0xf];
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q++;
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}
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p[i * 2] = '\0';
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*str = p;
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return i * 2;
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}
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ssize_t ROKEN_LIB_FUNCTION
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hex_decode(const char *str, void *data, size_t len)
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{
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size_t l;
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unsigned char *p = data;
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size_t i;
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l = strlen(str);
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/* check for overflow, same as (l+1)/2 but overflow safe */
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if ((l/2) + (l&1) > len)
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return -1;
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i = 0;
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if (l & 1) {
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p[0] = pos(str[0]);
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str++;
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p++;
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}
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for (i = 0; i < l / 2; i++)
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p[i] = pos(str[i * 2]) << 4 | pos(str[(i * 2) + 1]);
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return i + (l & 1);
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}
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