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/*
* This file is Copyright (c) 2010-2018 by the GPSD project
* SPDX-License-Identifier: BSD-2-clause
*/
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include "gpsd.h"
/*
* gpsd_packetdump()
*
* if binbuf is printable, just return a copy of it
* otherwise) convert a binary string to a hex string and return that
*
* *scbuf -- the buffer to fill with hex
* scbuflen -- sizeof(scbuf)
* *binbuf -- the binary to convert to hex and place in scbuf
* binbuflen -- sizeof(binbuf)
*
* scbuflen needs to be 2x binbuflen to hold the hex conversion
*/
const char *gpsd_packetdump(char *scbuf, size_t scbuflen,
char *binbuf, size_t binbuflen)
{
char *cp;
bool printable = true;
assert(binbuf != NULL);
for (cp = binbuf; cp < binbuf + binbuflen; cp++)
if (!isprint((unsigned char) *cp) && !isspace((unsigned char) *cp)) {
printable = false;
break; /* no need to keep iterating */
}
if (printable)
return binbuf;
else
return gpsd_hexdump(scbuf, scbuflen, binbuf, binbuflen);
}
const char *gpsd_hexdump(char *scbuf, size_t scbuflen,
char *binbuf, size_t binbuflen)
{
#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 "";
for (i = 0; i < len && j < (scbuflen - 3); i++) {
scbuf[j++] = hexchar[(ibuf[i] & 0xf0) >> 4];
scbuf[j++] = hexchar[ibuf[i] & 0x0f];
}
scbuf[j] = '\0';
#else /* SQUELCH defined */
scbuf[0] = '\0';
(void)scbuflen;
(void)binbuf;
(void)binbuflen;
#endif /* SQUELCH_ENABLE */
return scbuf;
}
static int hex2bin(const 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);
}
int gpsd_hexpack(const char *src, char *dst, size_t len)
/* hex2bin source string to destination - destination can be same as source */
{
int i, j;
j = (int)(strlen(src) / 2);
if ((j < 1) || ((size_t) j > len))
return -2;
for (i = 0; i < j; i++) {
int k;
if ((k = hex2bin(src + i * 2)) != -1)
dst[i] = (char)(k & 0xff);
else
return -1;
}
(void)memset(dst + i, '\0', (size_t) (len - i));
return j;
}
ssize_t hex_escapes(char *cooked, const char *raw)
/* interpret C-style hex escapes */
{
char c, *cookend;
for (cookend = cooked; *raw != '\0'; raw++)
if (*raw != '\\')
*cookend++ = *raw;
else {
switch (*++raw) {
case 'b':
*cookend++ = '\b';
break;
case 'e':
*cookend++ = '\x1b';
break;
case 'f':
*cookend++ = '\f';
break;
case 'n':
*cookend++ = '\n';
break;
case 'r':
*cookend++ = '\r';
break;
case 't':
*cookend++ = '\r';
break;
case 'v':
*cookend++ = '\v';
break;
case 'x':
switch (*++raw) {
case '0':
c = (char)0x00;
break;
case '1':
c = (char)0x10;
break;
case '2':
c = (char)0x20;
break;
case '3':
c = (char)0x30;
break;
case '4':
c = (char)0x40;
break;
case '5':
c = (char)0x50;
break;
case '6':
c = (char)0x60;
break;
case '7':
c = (char)0x70;
break;
case '8':
c = (char)0x80;
break;
case '9':
c = (char)0x90;
break;
case 'A':
case 'a':
c = (char)0xa0;
break;
case 'B':
case 'b':
c = (char)0xb0;
break;
case 'C':
case 'c':
c = (char)0xc0;
break;
case 'D':
case 'd':
c = (char)0xd0;
break;
case 'E':
case 'e':
c = (char)0xe0;
break;
case 'F':
case 'f':
c = (char)0xf0;
break;
default:
return -1;
}
switch (*++raw) {
case '0':
c += 0x00;
break;
case '1':
c += 0x01;
break;
case '2':
c += 0x02;
break;
case '3':
c += 0x03;
break;
case '4':
c += 0x04;
break;
case '5':
c += 0x05;
break;
case '6':
c += 0x06;
break;
case '7':
c += 0x07;
break;
case '8':
c += 0x08;
break;
case '9':
c += 0x09;
break;
case 'A':
case 'a':
c += 0x0a;
break;
case 'B':
case 'b':
c += 0x0b;
break;
case 'C':
case 'c':
c += 0x0c;
break;
case 'D':
case 'd':
c += 0x0d;
break;
case 'E':
case 'e':
c += 0x0e;
break;
case 'F':
case 'f':
c += 0x0f;
break;
default:
return -2;
}
*cookend++ = c;
break;
case '\\':
*cookend++ = '\\';
break;
default:
return -3;
}
}
return (ssize_t) (cookend - cooked);
}
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