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/* $Id: hex.c 4384 2007-06-04 05:06:34Z ckuethe $ */
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "gpsd_config.h"
#include "gpsd.h"
char /*@ observer @*/ *gpsd_hexdump(const void *binbuf, size_t binbuflen)
{
static char hexbuf[MAX_PACKET_LENGTH*2+1];
#ifndef SQUELCH_ENABLE
size_t i, j = 0;
size_t len = (size_t)((binbuflen > MAX_PACKET_LENGTH) ? MAX_PACKET_LENGTH : binbuflen);
const char *ibuf = (const char *)binbuf;
const char *hexchar = "0123456789abcdef";
if (NULL == binbuf || 0 == binbuflen)
return "";
/*@ -shiftimplementation @*/
for (i = 0; i < len; i++) {
hexbuf[j++] = hexchar[ (ibuf[i]&0xf0)>>4 ];
hexbuf[j++] = hexchar[ ibuf[i]&0x0f ];
}
/*@ +shiftimplementation @*/
hexbuf[j] ='\0';
#else /* SQUELCH defined */
hexbuf[0] = '\0';
#endif /* SQUELCH_ENABLE */
return hexbuf;
}
int gpsd_hexpack(char *src, char *dst, int len){
int i, k, l;
l = (int)(strlen(src) / 2);
if ((l < 1) || (l > len))
return -1;
bzero(dst, len);
for (i = 0; i < l; i++)
if ((k = hex2bin(src+i*2)) != -1)
dst[i] = (char)(k & 0xff);
else
return -1;
return l;
}
/*@ +charint -shiftimplementation @*/
int hex2bin(char *s)
{
int a, b;
a = s[0] & 0xff;
b = s[1] & 0xff;
if ((a >= 'a') && (a <= 'f'))
a = a + 10 - 'a';
else if ((a >= 'A') && (a <= 'F'))
a = a + 10 - 'A';
else if ((a >= '0') && (a <= '9'))
a -= '0';
else
return -1;
if ((b >= 'a') && (b <= 'f'))
b = b + 10 - 'a';
else if ((b >= 'A') && (b <= 'F'))
b = b + 10 - 'A';
else if ((b >= '0') && (b <= '9'))
b -= '0';
else
return -1;
return ((a<<4) + b);
}
/*@ -charint +shiftimplementation @*/
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