static int hex_to_data(uint8_t *data, const char *p) { int c, len, v; len = 0; v = 1; for(;;) { skip_spaces(&p); if (*p == '\0') break; c = toupper((unsigned char)*p++); if (c >= '0' && c <= '9') c = c - '0'; else if (c >= 'A' && c <= 'F') c = c - 'A' + 10; else break; v = (v << 4) | c; if (v & 0x100) { if (data) data[len] = v; len++; v = 1; } } return len; }