src/kits/network/netresolv/isc/hex.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 2001 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <port_before.h>
  19 #include <ctype.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <isc/misc.h>
  23 #include <port_after.h>
  24
  25 static const char hex[17] = "0123456789abcdef";
  26
  27 int
  28 isc_gethexstring(unsigned char *buf, size_t len, int count, FILE *fp,
  29                  int *multiline)
  30 {
  31         int c, n;
  32         unsigned char x;
  33         char *s;
  34         int result = count;
  35
  36         x = 0; /*%< silence compiler */
  37         n = 0;
  38         while (count > 0) {
  39                 c = fgetc(fp);
  40
  41                 if ((c == EOF) ||
  42                     (c == '\n' && !*multiline) ||
  43                     (c == '(' && *multiline) ||
  44                     (c == ')' && !*multiline))
  45                         goto formerr;
  46                 /* comment */
  47                 if (c == ';') {
  48                         do {
  49                                 c = fgetc(fp);
  50                         } while (c != EOF && c != '\n');
  51                         if (c == '\n' && *multiline)
  52                                 continue;
  53                         goto formerr;
  54                 }
  55                 /* white space */
  56                 if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
  57                         continue;
  58                 /* multiline */
  59                 if ('(' == c || c == ')') {
  60                         *multiline = (c == '(' /*)*/);
  61                         continue;
  62                 }
  63                 if ((s = strchr(hex, tolower(c))) == NULL)
  64                         goto formerr;
  65                 x = (x<<4) | (s - hex);
  66                 if (++n == 2) {
  67                         if (len > 0U) {
  68                                 *buf++ = x;
  69                                 len--;
  70                         } else
  71                                 result = -1;
  72                         count--;
  73                         n = 0;
  74                 }
  75         }
  76         return (result);
  77
  78  formerr:
  79         if (c == '\n')
  80                 ungetc(c, fp);
  81         return (-1);
  82 }
  83
  84 void
  85 isc_puthexstring(FILE *fp, const unsigned char *buf, size_t buflen,
  86                  size_t len1, size_t len2, const char *sep)
  87 {
  88         size_t i = 0;
  89
  90         if (len1 < 4U)
  91                 len1 = 4;
  92         if (len2 < 4U)
  93                 len2 = 4;
  94         while (buflen > 0U) {
  95                 fputc(hex[(buf[0]>>4)&0xf], fp);
  96                 fputc(hex[buf[0]&0xf], fp);
  97                 i += 2;
  98                 buflen--;
  99                 buf++;
 100                 if (i >= len1 && sep != NULL) {
 101                         fputs(sep, fp);
 102                         i = 0;
 103                         len1 = len2;
 104                 }
 105         }
 106 }
 107
 108 void
 109 isc_tohex(const unsigned char *buf, size_t buflen, char *t) {
 110         while (buflen > 0U) {
 111                 *t++ = hex[(buf[0]>>4)&0xf];
 112                 *t++ = hex[buf[0]&0xf];
 113                 buf++;
 114                 buflen--;
 115         }
 116         *t = '\0';
 117 }
 118
 119 /*! \file */