void from_hex(const char * in, unsigned char * out) {
while(*in != 0) {
unsigned char c = hc2b(*in++);
c = (c << 4) | hc2b(*in++);
*out++ = c;
}
}
static int
hex2bin(unsigned char *out, unsigned char *in)
{
unsigned char *out_start = out;
unsigned char *end = in + strlen((char *)in);
int is_low = 0;
int c;
/* Clamp to maximum packet size */
if (end - in > MAX_PACKET_LEN*2) /* As we're reading nibbles */
end = in + MAX_PACKET_LEN*2;
while (in < end)
{
c = hc2b(in[0]);
if (c < 0)
{
in++;
continue;
}
if (is_low == 0)
{
out[0] = c << 4;
is_low = 1;
} else {
out[0] |= (c & 0x0f);
is_low = 0;
out++;
}
in++;
}
return (int)(out - out_start);
}
static int
hex2bin(guint8 *out, guint8 *out_end, char *in)
{
guint8 *out_start = out;
int is_low = 0;
int c;
while (*in != '\0')
{
c = hc2b(*(unsigned char *)in);
if (c < 0)
{
in++;
continue;
}
if (out == out_end)
{
/* Too much data */
return -1;
}
if (is_low == 0)
{
*out = c << 4;
is_low = 1;
} else {
*out |= (c & 0x0f);
is_low = 0;
out++;
}
in++;
}
return (int)(out - out_start);
}
static void test_hc2b() {
assert(hc2b('0') == 0);
assert(hc2b('1') == 1);
assert(hc2b('2') == 2);
assert(hc2b('3') == 3);
assert(hc2b('4') == 4);
assert(hc2b('5') == 5);
assert(hc2b('6') == 6);
assert(hc2b('7') == 7);
assert(hc2b('8') == 8);
assert(hc2b('9') == 9);
assert(hc2b('A') == 10);
assert(hc2b('b') == 11);
assert(hc2b('C') == 12);
assert(hc2b('d') == 13);
assert(hc2b('e') == 14);
assert(hc2b('f') == 0x0f);
}