savegame: add 64 bit int support

src/game/savegame/savegame_bson.c

@@ -812,16 +812,13 @@ static bool SaveGame_BSON_LoadCurrentMusic(struct json_object_s *music_obj)
     }
 
     int16_t current_track = json_object_get_int(music_obj, "current_track", -1);
-    int32_t timestamp_arr[2];
-    timestamp_arr[0] = json_object_get_int(music_obj, "timestamp1", 0);
-    timestamp_arr[1] = json_object_get_int(music_obj, "timestamp2", 0);
-    int64_t *timestamp = (int64_t *)timestamp_arr;
+    int64_t timestamp = json_object_get_int64(music_obj, "timestamp", -1);
     if (current_track) {
         Music_Play(current_track);
-        if (!Music_SeekTimestamp(current_track, *timestamp)) {
+        if (!Music_SeekTimestamp(current_track, timestamp)) {
             LOG_WARNING(
                 "Could not load current track %d at timestamp %d.",
-                current_track, *timestamp);
+                current_track, timestamp);
         }
     }
 
@@ -1146,9 +1143,7 @@ static struct json_object_s *SaveGame_BSON_DumpCurrentMusic(void)
     if (Music_CurrentTrack()) {
         timestamp = Music_GetTimestamp(Music_CurrentTrack());
     }
-    int32_t *timestamp_arr = (int32_t *)&timestamp;
-    json_object_append_int(current_music_obj, "timestamp1", timestamp_arr[0]);
-    json_object_append_int(current_music_obj, "timestamp2", timestamp_arr[1]);
+    json_object_append_int64(current_music_obj, "timestamp", timestamp);
 
     return current_music_obj;
 }

src/json/json_base.c

@@ -68,6 +68,17 @@ struct json_number_s *json_number_new_int(int number)
     return elem;
 }
 
+struct json_number_s *json_number_new_int64(int64_t number)
+{
+    size_t size = snprintf(NULL, 0, "%" PRId64, number) + 1;
+    char *buf = Memory_Alloc(size);
+    sprintf(buf, "%" PRId64, number);
+    struct json_number_s *elem = Memory_Alloc(sizeof(struct json_number_s));
+    elem->number = buf;
+    elem->number_size = strlen(buf);
+    return elem;
+}
+
 struct json_number_s *json_number_new_double(double number)
 {
     size_t size = snprintf(NULL, 0, "%f", number) + 1;
@@ -317,6 +328,13 @@ void json_object_append_int(
         obj, key, json_value_from_number(json_number_new_int(number)));
 }
 
+void json_object_append_int64(
+    struct json_object_s *obj, const char *key, int64_t number)
+{
+    json_object_append(
+        obj, key, json_value_from_number(json_number_new_int64(number)));
+}
+
 void json_object_append_double(
     struct json_object_s *obj, const char *key, double number)
 {
@@ -402,6 +420,17 @@ int json_object_get_int(struct json_object_s *obj, const char *key, int d)
     return d;
 }
 
+int64_t json_object_get_int64(
+    struct json_object_s *obj, const char *key, int64_t d)
+{
+    struct json_value_s *value = json_object_get_value(obj, key);
+    struct json_number_s *num = json_value_as_number(value);
+    if (num) {
+        return strtoll(num->number, NULL, 10);
+    }
+    return d;
+}
+
 double json_object_get_double(
     struct json_object_s *obj, const char *key, double d)
 {

src/json/json_base.h

@@ -81,6 +81,7 @@ struct json_value_ex_s {
 
 // numbers
 struct json_number_s *json_number_new_int(int number);
+struct json_number_s *json_number_new_int64(int64_t number);
 struct json_number_s *json_number_new_double(double number);
 void json_number_free(struct json_number_s *num);
 
@@ -126,6 +127,8 @@ void json_object_append(
 void json_object_append_bool(struct json_object_s *obj, const char *key, int b);
 void json_object_append_int(
     struct json_object_s *obj, const char *key, int number);
+void json_object_append_int64(
+    struct json_object_s *obj, const char *key, int64_t number);
 void json_object_append_double(
     struct json_object_s *obj, const char *key, double number);
 void json_object_append_string(
@@ -141,6 +144,8 @@ struct json_value_s *json_object_get_value(
     struct json_object_s *obj, const char *key);
 int json_object_get_bool(struct json_object_s *obj, const char *key, int d);
 int json_object_get_int(struct json_object_s *obj, const char *key, int d);
+int64_t json_object_get_int64(
+    struct json_object_s *obj, const char *key, int64_t d);
 double json_object_get_double(
     struct json_object_s *obj, const char *key, double d);
 const char *json_object_get_string(