Sub-GHz: Fix GPS "Latitute" typo, switch to "Lat" and "Lon" in .sub files (#246)

* fix(subghz): s/Latitute/Latitude/

* feat(subghz): using Lat,Lon with fallback to older values

* Some speedup and fix fallbacks

* Update changelog

---------

Co-authored-by: Willy-JL <49810075+Willy-JL@users.noreply.github.com>

CHANGELOG.md

@@ -92,6 +92,7 @@
   - OFW: GProxII Fix Writing and Rendering Conflict (by @zinongli)
 - Desktop:
   - Fallback Poweroff prompt when power settings is unavailable (by @Willy-JL)
+- Sub-GHz: Fix GPS "Latitute" typo, switch to "Lat" and "Lon" in .sub files (#246 by @m7i-org)
 - Storage:
   - Fallback SD format prompt when storage settings is unavailable (by @Willy-JL)
   - OFW: Fix folder rename fails (by @portasynthinca3)

applications/main/subghz/subghz_i.c

@@ -86,7 +86,8 @@ bool subghz_key_load(SubGhz* subghz, const char* file_path, bool show_dialog) {
     SubGhzLoadKeyState load_key_state = SubGhzLoadKeyStateParseErr;
     FuriString* temp_str = furi_string_alloc();
     uint32_t temp_data32;
-    float temp_lat = NAN; // NAN or 0.0?? because 0.0 is valid value
+    //Using NAN in order to avoid the null island problem
+    float temp_lat = NAN;
     float temp_lon = NAN;
     SubGhzTx can_tx = SubGhzTxUnsupported;
 
@@ -156,15 +157,30 @@ bool subghz_key_load(SubGhz* subghz, const char* file_path, bool show_dialog) {
             }
         }
 
-        //Load latitute and longitude if present, strict mode to avoid reading the whole file twice
+        //Load latitude and longitude if present
+        //Strict mode to fail if next key doesn't match, instead of reading whole file
         flipper_format_set_strict_mode(fff_data_file, true);
-        if(!flipper_format_read_float(fff_data_file, "Latitute", (float*)&temp_lat, 1) ||
-           !flipper_format_read_float(fff_data_file, "Longitude", (float*)&temp_lon, 1)) {
-            FURI_LOG_W(TAG, "Missing Latitude and Longitude (optional)");
-            flipper_format_rewind(fff_data_file);
+        //Save position and seek instead of rewinding whole file when keys aren't found
+        Stream* fff_raw_stream = flipper_format_get_raw_stream(fff_data_file);
+        size_t pos_before_lat_lon = stream_tell(fff_raw_stream);
+        if(!flipper_format_read_float(fff_data_file, "Lat", (float*)&temp_lat, 1) ||
+           !flipper_format_read_float(fff_data_file, "Lon", (float*)&temp_lon, 1)) {
+            stream_seek(fff_raw_stream, pos_before_lat_lon, StreamOffsetFromStart);
+            //Fallback to older keys "Latitute", "Longitude"
+            if(!flipper_format_read_float(fff_data_file, "Latitute", (float*)&temp_lat, 1) ||
+               !flipper_format_read_float(fff_data_file, "Longitude", (float*)&temp_lon, 1)) {
+                FURI_LOG_W(TAG, "Missing Lat and Lon (optional)");
+                stream_seek(fff_raw_stream, pos_before_lat_lon, StreamOffsetFromStart);
+            }
         }
         flipper_format_set_strict_mode(fff_data_file, false);
 
+        //Avoid null island when reading
+        if(temp_lat == 0.0 && temp_lon == 0.0) {
+            temp_lat = NAN;
+            temp_lon = NAN;
+        }
+
         size_t preset_index =
             subghz_setting_get_inx_preset_by_name(setting, furi_string_get_cstr(temp_str));
         subghz_txrx_set_preset(

lib/subghz/blocks/generic.c

@@ -63,13 +63,13 @@ SubGhzProtocolStatus subghz_block_generic_serialize_common(
                 break;
             }
         }
-        if(!flipper_format_write_float(flipper_format, "Latitute", &preset->latitude, 1)) {
-            FURI_LOG_E(TAG, "Unable to add Latitute");
+        if(!flipper_format_write_float(flipper_format, "Lat", &preset->latitude, 1)) {
+            FURI_LOG_E(TAG, "Unable to add Lat");
             res = SubGhzProtocolStatusErrorParserLatitude;
             break;
         }
-        if(!flipper_format_write_float(flipper_format, "Longitude", &preset->longitude, 1)) {
-            FURI_LOG_E(TAG, "Unable to add Longitude");
+        if(!flipper_format_write_float(flipper_format, "Lon", &preset->longitude, 1)) {
+            FURI_LOG_E(TAG, "Unable to add Lon");
             res = SubGhzProtocolStatusErrorParserLongitude;
             break;
         }