Add geodir hashmap to decoder

src/decoder/mod.rs

@@ -210,6 +210,7 @@ where
     photometric_interpretation: PhotometricInterpretation,
     compression_method: CompressionMethod,
     strip_decoder: Option<StripDecodeState>,
+    geokey_dir: Option<HashMap<geo::geo_key::GeoKey, geo::geo_key::GeoKeyType>>,
 }
 
 trait Wrapping {
@@ -325,6 +326,7 @@ impl<R: Read + Seek> Decoder<R> {
             photometric_interpretation: PhotometricInterpretation::BlackIsZero,
             compression_method: CompressionMethod::None,
             strip_decoder: None,
+            geokey_dir: None,
         }
         .init()
     }
@@ -478,7 +480,11 @@ impl<R: Read + Seek> Decoder<R> {
             Ok(geodir) => {
                 let ascii_params = Result::ok(self.get_tag_ascii_string(Tag::GeoAsciiParamsTag));
                 let double_params = Result::ok(self.get_tag_f64_vec(Tag::GeoDoubleParamsTag));
-                geo::geo_key::parse_geo_keys(geodir, ascii_params, double_params);
+                self.geokey_dir = Some(geo::geo_key::parse_geo_keys(
+                    geodir,
+                    ascii_params,
+                    double_params,
+                ));
                 // TODO: save the hashmap somewhere in this module/decoder
             }
             Err(_) => {}