Use libdng to parse the calibration file

src/dcp.c

@@ -1,7 +1,9 @@
 #include "dcp.h"
 
+#include <libdng.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <string.h>
 #include <unistd.h>
 
 bool
@@ -15,18 +17,18 @@ find_calibration_by_model(char *conffile, char *model, const char *sensor)
         }
 
         // Check user overridden /etc/megapixels/config/%model,%sensor.dcp
-        sprintf(conffile,
-                "%s/megapixels/config/%s,%s.dcp",
-                "/etc",
-                model,
-                sensor);
+        sprintf(conffile, "%s/megapixels/config/%s,%s.dcp", "/etc", model, sensor);
         if (access(conffile, F_OK) != -1) {
                 printf("Found calibration file at %s\n", conffile);
                 return true;
         }
 
         // Check packaged /usr/share/megapixels/config/%model,%sensor.ini
-        sprintf(conffile, "%s/megapixels/config/%s,%s.dcp", "/usr/share", model, sensor);
+        sprintf(conffile,
+                "%s/megapixels/config/%s,%s.dcp",
+                "/usr/share",
+                model,
+                sensor);
         if (access(conffile, F_OK) != -1) {
                 printf("Found calibration file at %s\n", conffile);
                 return true;
@@ -63,3 +65,21 @@ find_calibration(char *conffile, const char *sensor)
                 }
         }
 }
+struct MPCameraCalibration
+parse_calibration_file(const char *path)
+{
+        struct MPCameraCalibration result;
+        libdng_info temp = { 0 };
+        libdng_new(&temp);
+        libdng_load_calibration_file(&temp, path);
+
+        memcpy(result.color_matrix_1, temp.color_matrix_1, 9 * sizeof(float));
+        memcpy(result.color_matrix_2, temp.color_matrix_2, 9 * sizeof(float));
+        memcpy(result.forward_matrix_1, temp.forward_matrix_1, 9 * sizeof(float));
+        memcpy(result.forward_matrix_2, temp.forward_matrix_2, 9 * sizeof(float));
+        result.tone_curve_length = temp.tone_curve_length;
+        memcpy(result.tone_curve,
+               temp.tone_curve,
+               temp.tone_curve_length * sizeof(float));
+        return result;
+}