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/*
* hex.c
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
* $Id: hex.c,v 1.5 2001/03/15 08:33:03 dugsong Exp $
*/
#include "config.h"
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "hex.h"
int
hex_decode(char *src, int srclen, u_char *dst, int dstlen)
{
char *p, *pe;
u_char *q, *qe, ch, cl;
pe = src + srclen;
qe = dst + dstlen;
if (strncmp(src, "0x", 2) == 0)
src += 2;
for (p = src, q = dst; p < pe && q < qe && isxdigit((int)*p); p += 2) {
ch = tolower(p[0]);
cl = tolower(p[1]);
if ((ch >= '0') && (ch <= '9')) ch -= '0';
else if ((ch >= 'a') && (ch <= 'f')) ch -= 'a' - 10;
else return (-1);
if ((cl >= '0') && (cl <= '9')) cl -= '0';
else if ((cl >= 'a') && (cl <= 'f')) cl -= 'a' - 10;
else return (-1);
*q++ = (ch << 4) | cl;
}
return (q - dst);
}
/* adapted from OpenBSD tcpdump: dump the buffer in emacs-hexl format */
void
hex_print(const u_char *buf, int len, int offset)
{
u_int i, j, jm;
int c;
printf("\n");
for (i = 0; i < len; i += 0x10) {
printf(" %04x: ", (u_int)(i + offset));
jm = len - i;
jm = jm > 16 ? 16 : jm;
for (j = 0; j < jm; j++) {
if ((j % 2) == 1) printf("%02x ", (u_int) buf[i+j]);
else printf("%02x", (u_int) buf[i+j]);
}
for (; j < 16; j++) {
if ((j % 2) == 1) printf(" ");
else printf(" ");
}
printf(" ");
for (j = 0; j < jm; j++) {
c = buf[i+j];
c = isprint(c) ? c : '.';
printf("%c", c);
}
printf("\n");
}
}
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