Add check for correct firmware when flashing to a devices

It's using the product string for now, but there are other
things that we could check too. Use -i to ignore the check.
rad1o badge will always pass the check because it uses
"HackRF" as the product string, whichis a substring of both
other devices..

host/hackrf-tools/src/hackrf_spiflash.c

@@ -51,6 +51,7 @@ static struct option long_options[] = {
 	{ "length", required_argument, 0, 'l' },
 	{ "read", required_argument, 0, 'r' },
 	{ "write", required_argument, 0, 'w' },
+	{ "compatibility", no_argument, 0, 'c' },
 	{ "device", required_argument, 0, 'd' },
 	{ "reset", no_argument, 0, 'R' },
 	{ "verbose", no_argument, 0, 'v' },
@@ -58,6 +59,51 @@ static struct option long_options[] = {
 	{ 0, 0, 0, 0 },
 };
 
+int compatibility_check(uint8_t* data, int length, hackrf_device* device)
+{
+	int str_len, i,j;
+	bool match = false;
+	uint8_t board_id;
+	char* dev_str;
+	hackrf_board_id_read(device, &board_id);
+	switch(board_id)
+	{
+	case BOARD_ID_JAWBREAKER:
+		dev_str = "HackRF Jawbreaker";
+		str_len = 17;
+		break;
+	case BOARD_ID_HACKRF_ONE:
+		dev_str =  "HackRF One";
+		str_len = 10;
+		break;
+	case BOARD_ID_RAD1O:
+		//This is somewhat problematic,
+		// it's a substring of the others
+		dev_str =  "HackRF";
+		str_len = 6;
+		break;
+	default:
+		printf("Unknown Board ID");
+		return 1;
+	}
+	for(i=0; i<length-str_len; i++){
+		if(data[i] == dev_str[0]) {
+			// Test rest of string
+			match = true;
+			for(j=1; j<str_len; j++) {
+				if((data[i+j*2] != dev_str[j]) ||
+				   (data[1+i+j*2] != 0x00)) {
+					match = false;
+					break;
+				}
+			}
+			if(match)
+				return 0;
+		}
+	}
+	return 1;
+}
+
 int parse_u32(char* s, uint32_t* const value)
 {
 	char* s_end;
@@ -94,6 +140,7 @@ static void usage()
 	printf("\t-l, --length <n>: number of bytes to read (default: %d)\n", MAX_LENGTH);
 	printf("\t-r, --read <filename>: Read data into file.\n");
 	printf("\t-w, --write <filename>: Write data from file.\n");
+	printf("\t-i, --no-check: Skip check for firmware compatibility with target device.\n");
 	printf("\t-d, --device <serialnumber>: Serial number of device, if multiple devices\n");
 	printf("\t-R, --reset: Reset HackRF after other operations.\n");
 	printf("\t-v, --verbose: Verbose output.\n");
@@ -116,11 +163,12 @@ int main(int argc, char** argv)
 	FILE* fd = NULL;
 	bool read = false;
 	bool write = false;
+	bool ignore_compat_check = false;
 	bool verbose = false;
 	bool reset = false;
 	uint16_t usb_api;
 
-	while ((opt = getopt_long(argc, argv, "a:l:r:w:d:vRh?", long_options,
+	while ((opt = getopt_long(argc, argv, "a:l:r:w:id:vRh?", long_options,
 			&option_index)) != EOF) {
 		switch (opt) {
 		case 'a':
@@ -141,6 +189,10 @@ int main(int argc, char** argv)
 			path = optarg;
 			break;
 
+		case 'i':
+			ignore_compat_check = true;
+			break;
+		
 		case 'd':
 			serial_number = optarg;
 			break;
@@ -278,6 +330,16 @@ int main(int argc, char** argv)
 			fd = NULL;
 			return EXIT_FAILURE;
 		}
+		if(!ignore_compat_check) {
+			printf("Checking target device compatibility\n");
+			result = compatibility_check(data, length, device);
+			if(result) {
+				printf("Compatibility test failed.\n");
+				fclose(fd);
+				fd = NULL;
+				return EXIT_FAILURE;
+			}
+		}
 		printf("Erasing SPI flash.\n");
 		result = hackrf_spiflash_erase(device);
 		if (result != HACKRF_SUCCESS) {