More WIP

src/assets.c

@@ -1,6 +1,7 @@
 #include <SDL3/SDL.h>
 #include <SDL3_image/SDL_image.h>
 #include <SDL3_mixer/SDL_mixer.h>
+#include <SDL3/SDL_stdinc.h>
 #include <aklabs/exclib.h>
 #include "game.h"
 
@@ -12,10 +13,13 @@ void load_frame_from_image(char *fname, GAME_frame *frame)
   THROW_ZERO(frame, EXC_NULLPOINTER, "load_frame_from_image received NULL frame");
   THROW_ZERO(fname, EXC_NULLPOINTER, "load_frame_from_image received NULL filename");
 
-  SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), fname);
-  tex = IMG_LoadTexture(renderer, asset_path);
-
-  THROW_ZERO(tex, EXC_NULLPOINTER, "Failed loading asset");
+  TRY {
+    SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), fname);
+    tex = IMG_LoadTexture(renderer, asset_path);
+    THROW_ZERO(tex, EXC_NULLPOINTER, "Failed loading asset");
+  } FINALLY {
+    SDL_free(asset_path);
+  } ETRY;
   
   frame->texture = tex;
   SDL_GetTextureSize(tex, &frame->w, &frame->h);
@@ -27,12 +31,15 @@ void load_start_bgm(char *fname)
   
   THROW_ZERO(fname, EXC_NULLPOINTER, "load_start_bgm received NULL filename");
   
-  SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), fname);
-  SDL_Log("Loading music asset from %s", asset_path);
-  bgm = Mix_LoadMUS(asset_path);
-  THROW_ZERO(bgm, EXC_NULLPOINTER, "Failed to load music asset");
-  
-  if (!Mix_PlayMusic(bgm, 0)) {
-    THROW(EXC_SDL_MUSICMIXER, "Failed to play music asset");
-  }
+  TRY {
+    SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), fname);
+    SDL_Log("Loading music asset from %s", asset_path);
+    bgm = Mix_LoadMUS(asset_path);
+    THROW_ZERO(bgm, EXC_NULLPOINTER, "Failed to load music asset");
+    if (!Mix_PlayMusic(bgm, 0)) {
+      THROW(EXC_SDL_MUSICMIXER, "Failed to play music asset");
+    }
+  } FINALLY {
+    SDL_free(asset_path);
+  } ETRY;
 }

src/json_helpers.c

@@ -1,6 +1,8 @@
 #include <jansson.h>
 #include "json_helpers.h"
 #include "game.h"
+#include "string.h"
+#include "heap.h"
 
 json_t *get_json_object_value(json_t *obj, char *key)
 {
@@ -10,12 +12,14 @@ json_t *get_json_object_value(json_t *obj, char *key)
   return value;
 }
 
-int get_json_boolean_value(json_t *obj, char *key)
+bool get_json_boolean_value(json_t *obj, char *key)
 {
   json_t *value = json_object_get(obj, key);
   THROW_ZERO(value, EXC_KEYERROR, "");
   THROW_ZERO(json_is_boolean(value), EXC_ATTRIBUTEERROR, "");
-  return json_boolean_value(value);
+  bool i = json_boolean_value(value);
+  json_decref(value);
+  return i;
 }
 
 int get_json_integer_value(json_t *obj, char *key)
@@ -23,30 +27,38 @@ int get_json_integer_value(json_t *obj, char *key)
   json_t *value = json_object_get(obj, key);
   THROW_ZERO(value, EXC_KEYERROR, "");
   THROW_ZERO(json_is_integer(value), EXC_ATTRIBUTEERROR, "");
-  return json_integer_value(value);
+  int i = json_integer_value(value);
+  json_decref(value);
+  return i;
 }
 
 float get_json_number_value(json_t *obj, char *key)
 {
   json_t *value = json_object_get(obj, key);
+  float f;
   THROW_ZERO(value, EXC_KEYERROR, "");
   THROW_ZERO(json_is_number(value), EXC_ATTRIBUTEERROR, "");
-  return json_number_value(value);
+  f = json_number_value(value);
+  json_decref(value);
+  return f;
 }
 
-const char *get_json_string_value(json_t *obj, char *key)
+string *get_json_string_value(json_t *obj, char *key)
 {
+  string *s = heap_next_string();
   json_t *value = json_object_get(obj, key);
-  THROW_ZERO(value, EXC_KEYERROR, "");
-  THROW_ZERO(json_is_string(value), EXC_ATTRIBUTEERROR, "");
-  return json_string_value(value);
+  THROW_ZERO(value, EXC_KEYERROR, key);
+  THROW_ZERO(json_is_string(value), EXC_ATTRIBUTEERROR, key);
+  strncpy(s->data, (char *)json_string_value(value), MAX_STRING_LENGTH);
+  json_decref(value);
+  return s;
 }
 
 json_t *get_json_array_value(json_t *obj, char *key)
 {
   json_t *value = json_object_get(obj, key);
-  THROW_ZERO(value, EXC_KEYERROR, "");
-  THROW_ZERO(json_is_array(value), EXC_ATTRIBUTEERROR, "");
+  THROW_ZERO(value, EXC_KEYERROR, key);
+  THROW_ZERO(json_is_array(value), EXC_ATTRIBUTEERROR, key);
   return value;
 }
 
@@ -60,8 +72,11 @@ json_t *get_json_array_index_object(json_t *array, int index)
 
 int get_json_array_index_integer(json_t *array, int index)
 {
+  int i;
   json_t *value = json_array_get(array, index);
   THROW_ZERO(value, EXC_INDEXERROR, "");
   THROW_ZERO(json_is_integer(value), EXC_ATTRIBUTEERROR, "");
-  return json_integer_value(value);
+  i = json_integer_value(value);
+  json_decref(value);
+  return i;
 }

src/json_helpers.h

@@ -1,11 +1,14 @@
 #ifndef _JSON_HELPERS_H_
 #define _JSON_HELPERS_H_
 
+#include <stdbool.h>
+#include "string.h"
+
 json_t *get_json_object_value(json_t *obj, char *key);
-int get_json_boolean_value(json_t *obj, char *key);
+bool get_json_boolean_value(json_t *obj, char *key);
 int get_json_integer_value(json_t *obj, char *key);
 float get_json_number_value(json_t *obj, char *key);
-const char *get_json_string_value(json_t *obj, char *key);
+string *get_json_string_value(json_t *obj, char *key);
 json_t *get_json_array_value(json_t *obj, char *key);
 json_t *get_json_array_index_object(json_t *array, int index);
 int get_json_array_index_integer(json_t *array, int index);

src/sdl3-gametest.c

@@ -83,18 +83,6 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
 	  return SDL_APP_FAILURE;
      } ETRY;
 
-     /*TRY {
-       actorptr = heap_next_actor();
-       actor_initialize(actorptr, "npc");
-       actorptr->basechar = characterptr;
-       actorptr->x = 0;
-       actorptr->y = 0;
-       actorptr->state = (ACTOR_STATE_ALIVE | ACTOR_STATE_FACE_LEFT | ACTOR_STATE_MOVING_LEFT);
-       } CATCH(EXC_NULLPOINTER) {
-       SDL_Log("Attempting to setup npc: %s (%s)", EXCLIB_EXCEPTION->description, SDL_GetError());
-       return SDL_APP_FAILURE;
-       } ETRY;*/
-
      /*
        TRY {
        //load_start_bgm("../assets/nutcracker.mid");

src/sprite.c

@@ -1,10 +1,11 @@
 #include <SDL3/SDL.h>
+#include <SDL3/SDL_stdinc.h>
 #include <SDL3_image/SDL_image.h>
 #include <box2d/box2d.h>
 #include <aklabs/exclib.h>
 #include <string.h>
 #include <jansson.h>
-
+#include "string.h"
 #include "game.h"
 #include "sprite.h"
 #include "json_helpers.h"
@@ -142,6 +143,7 @@ void character_load_json(char *filename)
     json_t *mappings;
     json_t *curmapping;
     json_error_t error;
+    string *s;
     sprite *spriteptr = NULL;
     char *asset_path = NULL;
     character *obj = NULL;
@@ -149,29 +151,32 @@ void character_load_json(char *filename)
     
     THROW_ZERO(filename, EXC_NULLPOINTER, "Received null filename");
     obj = heap_next_character();
-    SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), filename);
-    json = json_load_file(asset_path, 0, &error);
-    if (!json) {
-	SDL_Log("Error while loading character from %s on line %d: %s", asset_path, error.line, error.text);
-	THROW(EXC_NULLPOINTER, "Loading JSON sprite failed");
-    }
-    
-    character_initialize(obj, (char *)get_json_string_value(json, "name"));
     TRY {
+	SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), filename);
+	json = json_load_file(asset_path, 0, &error);
+	if (!json) {
+	    SDL_Log("Error while loading character from %s on line %d: %s", asset_path, error.line, error.text);
+	    THROW(EXC_NULLPOINTER, "Loading JSON sprite failed");
+	}
+    } FINALLY {
+	SDL_free(asset_path);
+    } ETRY;
+
+    TRY {
+	s = get_json_string_value(json, "name");
+	character_initialize(obj, s->data);
+	heap_release_string(s);
 	mappings = get_json_array_value(json, "sprite_mappings");
 	TRY {
 	    for ( i = 0; i < json_array_size(mappings) ; i++ ) {
 		curmapping = get_json_array_index_object(mappings, i);
+		s = get_json_string_value(curmapping, "sprite");
 		spriteptr = SDL_GetPointerProperty(
 		    REGISTRY_SPRITE,
-		    get_json_string_value(curmapping, "sprite"),
+		    s->data,
 		    NULL
 		    );
-		SDL_Log("Character %s for state %d references sprite %s",
-			(char *)get_json_string_value(json, "name"),
-			get_json_integer_value(curmapping, "state"),
-			(char *)get_json_string_value(curmapping, "sprite")
-		    );
+		heap_release_string(s);
 		THROW_ZERO(spriteptr, EXC_NULLPOINTER, "Character references sprite that does not exist");
 		character_sprite_add(
 		    obj,
@@ -181,9 +186,9 @@ void character_load_json(char *filename)
 	    }
 	} FINALLY {
 	    json_decref(curmapping);
-	    json_decref(mappings);
 	} ETRY;
     } FINALLY {
+	json_decref(mappings);
 	json_decref(json);
     } ETRY;
 }
@@ -194,6 +199,7 @@ void sprite_load_json(char *filename)
     json_t *spritesheet_json;
     json_t *frames;
     json_error_t error;
+    string *s;
     spritesheet *sheet = NULL;
     char *asset_path = NULL;
     sprite *obj = NULL;
@@ -201,34 +207,43 @@ void sprite_load_json(char *filename)
     
     THROW_ZERO(filename, EXC_NULLPOINTER, "Received null filename");
     obj = heap_next_sprite();
-    SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), filename);
-    json = json_load_file(asset_path, 0, &error);
-    if (!json) {
-	SDL_Log("Error while loading sprite from %s on line %d: %s", asset_path, error.line, error.text);
-	THROW(EXC_NULLPOINTER, "Loading JSON sprite failed");
-    }
+
+    TRY {
+	SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), filename);
+	json = json_load_file(asset_path, 0, &error);
+	if (!json) {
+	    SDL_Log("Error while loading sprite from %s on line %d: %s", asset_path, error.line, error.text);
+	    THROW(EXC_NULLPOINTER, "Loading JSON sprite failed");
+	}
+    } FINALLY {
+	SDL_free(asset_path);
+    } ETRY;
     
     TRY {
 	spritesheet_json = get_json_object_value(json, "spritesheet");
+	s = get_json_string_value(spritesheet_json, "filename");
 	sheet = SDL_GetPointerProperty(
 	    REGISTRY_SPRITESHEET,
-	    get_json_string_value(spritesheet_json, "filename"),
+	    s->data,
 	    NULL
 	    );
-	if ( sheet == NULL ) {
-	    sheet = heap_next_spritesheet();
-	    spritesheet_initialize(
-		sheet,
-		get_json_integer_value(spritesheet_json, "frame_width"),
-		get_json_integer_value(spritesheet_json, "frame_height"),
-		(char *)get_json_string_value(spritesheet_json, "filename")
-		);
-	}
 	TRY {
+	    if ( sheet == NULL ) {
+		sheet = heap_next_spritesheet();
+		spritesheet_initialize(
+		    sheet,
+		    get_json_integer_value(spritesheet_json, "frame_width"),
+		    get_json_integer_value(spritesheet_json, "frame_height"),
+		    s->data
+		    );
+	    }
+	    heap_release_string(s);
+	    s = get_json_string_value(json, "name");
 	    sprite_initialize(
 		obj,
-		(char *)get_json_string_value(json, "name"),
+		s->data,
 		sheet);
+	    heap_release_string(s);
 	} FINALLY {
 	    json_decref(spritesheet_json);
 	} ETRY;
@@ -274,8 +289,13 @@ void spritesheet_initialize(spritesheet *sheet, short sprite_w, short sprite_h,
     THROW_ZERO(sheet, EXC_NULLPOINTER, "Null spritesheet pointer");
     THROW_ZERO(filename, EXC_NULLPOINTER, "Null filename pointer");
 
-    SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), filename);
-    sheet->texture = IMG_LoadTexture(renderer, asset_path);
+    TRY {
+	SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), filename);
+	sheet->texture = IMG_LoadTexture(renderer, asset_path);
+    } FINALLY {
+	SDL_free(asset_path);
+    } ETRY;
+
     strncpy(sheet->name, filename, SPRITE_SHEET_MAX_FILENAME_LENGTH);
   
     THROW_ZERO(sheet->texture, EXC_NULLPOINTER, "Failed loading asset");
@@ -351,3 +371,4 @@ void character_state_sprites_iterate(void *userdata, SDL_PropertiesID registry,
     }
 }
 
+

src/string.c

@@ -7,6 +7,6 @@ void string_initialize(string *obj, char *init)
   if ( init != NULL ) {
     strncpy(obj->data, init, MAX_STRING_LENGTH);
   } else {
-    memset(&obj->data, 0x00, sizeof(MAX_STRING_LENGTH));
+    memset(obj->data, 0x00, sizeof(string));
   }
 }

src/tilemap.c

@@ -2,51 +2,67 @@
 #include <SDL3_image/SDL_image.h>
 #include <SDL3_mixer/SDL_mixer.h>
 #include <aklabs/exclib.h>
-#include <string.h>
-#include <jansson.h>
-
 #include "tilemap.h"
 #include "game.h"
 #include "sprite.h"
-#include "json_helpers.h"
 #include "heap.h"
-#include "string.h"
 #include "registry.h"
+#include "string.h"
+#include <string.h>
+#include <jansson.h>
+#include "json_helpers.h"
 
 static json_t *get_json_tilemap_property(json_t *obj, char *key, char *type)
 {
   json_t *properties;
   json_t *property;
+  string *s;
   int i = 0;
   // This is not a generic JSON helper. It assumes we are receiving an object with a 'properties' key
   // inside of it. That key is an array of objects, and each object has a name, type, and value.
   THROW_ZERO(obj, EXC_NULLPOINTER, "NULL json obj reference");
   THROW_ZERO(key, EXC_NULLPOINTER, "NULL key string");
   properties = get_json_array_value(obj, "properties");
-  for (i = 0; i < json_array_size(properties); i++) {
-    property = get_json_array_index_object(properties, i);
-    if ( strcmp(get_json_string_value(property, "name"), key) != 0 ) {
-      continue;
+  TRY {
+    for (i = 0; i < json_array_size(properties); i++) {
+      property = get_json_array_index_object(properties, i);
+      s = get_json_string_value(property, "name");
+      if ( strcmp(s->data, key) != 0 ) {
+	heap_release_string(s);
+	continue;
+      }
+      heap_release_string(s);
+      s = get_json_string_value(property, "type");
+      if ( strcmp(s->data, type) != 0 ) {
+	THROW(EXC_ATTRIBUTEERROR, "Character property is present but is incorrect type");
+      }
+      heap_release_string(s);
+      json_decref(properties);
+      return property;
     }
-    if ( strcmp(get_json_string_value(property, "type"), type) != 0 ) {
-      THROW(EXC_ATTRIBUTEERROR, "Character property is present but is incorrect type");
-    }
-    return property;
-  }
+  } FINALLY {
+    heap_release_string(s);
+    json_decref(properties);
+  } ETRY;
   THROW(EXC_KEYERROR, "Property not found in properties map");
 }
 
 
-static const char *get_json_properties_string(json_t *obj, char *key)
+static string *get_json_properties_string(json_t *obj, char *key)
 {
   json_t *property = get_json_tilemap_property(obj, key, "string");
-  return get_json_string_value(property, "value");
+  string *s = get_json_string_value(property, "value");;
+  json_decref(property);
+  return s;
 }
 
 static int get_json_properties_integer(json_t *obj, char *key)
 {
+  
   json_t *property = get_json_tilemap_property(obj, key, "int");
-  return get_json_integer_value(property, "value");
+  int i = get_json_integer_value(property, "value");
+  json_decref(property);
+  return i;
 }
 
 static void tilemap_load_tilesets(tilemap *dest, json_t *root)
@@ -54,6 +70,7 @@ static void tilemap_load_tilesets(tilemap *dest, json_t *root)
   THROW_ZERO(dest, EXC_NULLPOINTER, "Received NULL tilemap pointer");
   THROW_ZERO(root, EXC_NULLPOINTER, "Received NULL json object pointer");
   char *asset_path;
+  string *s;
   json_t *tilesets = get_json_array_value(root, "tilesets");
   json_t *tileset;
   int i;
@@ -76,17 +93,21 @@ static void tilemap_load_tilesets(tilemap *dest, json_t *root)
     dest->tilesets[i].tileheight = get_json_integer_value(tileset, "tileheight");
     dest->tilesets[i].tilewidth = get_json_integer_value(tileset, "tilewidth");
 
+    s = get_json_string_value(tileset, "name");
     strncpy((char *)&dest->tilesets[i].name,
-	    get_json_string_value(tileset, "name"),
+	    s->data,
 	    TILEMAP_MAX_TILESET_NAME_SIZE
 	    );
+    heap_release_string(s);
 
+    s = get_json_string_value(tileset, "image");
     snprintf((char *)&dest->tilesets[i].imagefilename,
 	     TILEMAP_MAX_TILESET_FILENAME_SIZE,
 	     "%s%s",
 	     SDL_GetBasePath(),
-	     get_json_string_value(tileset, "image")
+	     s->data
 	     );
+    heap_release_string(s);
     dest->tilesets[i].texture = IMG_LoadTexture(renderer, (char *)&dest->tilesets[i].imagefilename);
     THROW_ZERO(dest->tilesets[i].texture, EXC_NULLPOINTER, "Failed loading tileset image");
 
@@ -134,8 +155,10 @@ static void tilemap_load_tilesets(tilemap *dest, json_t *root)
 	      y_offset);*/
     }
     // SDL_Log("Processed %d total tiles for tileset", j);
+    json_decref(tileset);
     dest->numtilesets += 1;
   }
+  json_decref(tilesets);
 }
 
 static void tilemap_load_layer_objects(tilemap *dest, json_t *root, int layerid)
@@ -145,6 +168,8 @@ static void tilemap_load_layer_objects(tilemap *dest, json_t *root, int layerid)
   int j;
   int len;
   actor *actorobj;
+  string *s;
+  string *sc;
   tilemap_layer *curlayer;
   tilemap_object *curobj;
   const char *charptr;
@@ -159,11 +184,14 @@ static void tilemap_load_layer_objects(tilemap *dest, json_t *root, int layerid)
     for ( j = 0; j < len; j++ ) {
       layerdatavalue = get_json_array_index_object(layerdata, j);
       curobj = &curlayer->objects[j];
-      strncpy(curobj->name, get_json_string_value(layerdatavalue, "name"), SPRITE_MAX_ACTOR_NAME_LENGTH);
+      s = get_json_string_value(layerdatavalue, "name");
+      strncpy(curobj->name, s->data, SPRITE_MAX_ACTOR_NAME_LENGTH);
+      heap_release_string(s);
       curobj->x = (int) get_json_number_value(layerdatavalue, "x");
       curobj->y = (int) get_json_number_value(layerdatavalue, "y");
       curobj->visible = get_json_boolean_value(layerdatavalue, "visible");
-      if ( strcmp((char *)get_json_string_value(layerdatavalue, "type"), "actor") == 0 ) {
+      s = get_json_string_value(layerdatavalue, "type");
+      if ( strcmp(s->data, "actor") == 0 ) {
 	curobj->type = TILEMAP_OBJECT_TYPE_ACTOR;
 	if ( strlen((char *)&curobj->name) == 0 ) {
 	  THROW(EXC_KEYERROR, "Actor in tile object layer cannot have empty name");
@@ -171,8 +199,10 @@ static void tilemap_load_layer_objects(tilemap *dest, json_t *root, int layerid)
 	actorobj = SDL_GetPointerProperty(REGISTRY_ACTOR, (char *)&curobj->name, NULL);
 	if ( actorobj == NULL ) {
 	  actorobj = heap_next_actor();
+	  sc = get_json_properties_string(layerdatavalue, "character");
 	  actor_initialize(actorobj, (char *)&curobj->name);
-	  actor_set_character(actorobj, (char *)get_json_properties_string(layerdatavalue, "character"));
+	  actor_set_character(actorobj, sc->data);
+	  heap_release_string(sc);
 	} else {
 	  actorobj->refcount += 1;
 	}
@@ -186,6 +216,7 @@ static void tilemap_load_layer_objects(tilemap *dest, json_t *root, int layerid)
       json_decref(layerdatavalue);
     }
   } FINALLY {
+    heap_release_string(s);
     if ( layerdatavalue != NULL ) {
       json_decref(layerdatavalue);
     }
@@ -212,6 +243,7 @@ static void tilemap_load_layer_tile(tilemap *dest, json_t *root, int layerid)
     json_decref(layerdata);
     THROW(EXC_OUTOFBOUNDS, "Map layer exceeds the maximum size");
   }
+  TRY {
   for ( j = 0; j < layerdatalen; j++ ) {
     layerdatavalue = json_array_get(layerdata, j);
     if (!json_is_integer(layerdatavalue)) {
@@ -222,7 +254,12 @@ static void tilemap_load_layer_tile(tilemap *dest, json_t *root, int layerid)
     dest->layers[layerid].data[j] = json_integer_value(layerdatavalue);
     json_decref(layerdatavalue);
   }
-  json_decref(layerdata);
+  } FINALLY {
+    if ( layerdatavalue != NULL ) {
+      json_decref(layerdatavalue);
+      json_decref(layerdata);
+    }
+  } ETRY;
 }
 
 static void tilemap_load_layers(tilemap *dest, json_t *root)
@@ -231,42 +268,47 @@ static void tilemap_load_layers(tilemap *dest, json_t *root)
   THROW_ZERO(root, EXC_NULLPOINTER, "tilemap_load_layers received NULL json object pointer");
   json_t *layers = get_json_array_value(root, "layers");
   json_t *layer;
+  string *s;
   const char *layertype = NULL;
   int i;
   
   dest->numlayers = json_array_size(layers);
-  for ( i = 0; i < dest->numlayers; i++) {
-    if ( i >= TILEMAP_MAX_LAYERS ) {
-      json_decref(layers);
-      THROW(EXC_OUTOFBOUNDS, "Map exceeds the maximum number of layers");
-    }
-    layer = get_json_array_index_object(layers, i);
-    if ( (get_json_integer_value(layer, "id") - 1) != i ) {
-      // TileD's map layer IDs start at 1, not 0, and are sequential but not necessarily contiguous. We may have a gap in IDs.
-      json_decref(layer);
-      continue;
-    }
+  TRY {
+    for ( i = 0; i < dest->numlayers; i++) {
+      if ( i >= TILEMAP_MAX_LAYERS ) {
+	THROW(EXC_OUTOFBOUNDS, "Map exceeds the maximum number of layers");
+      }
+      layer = get_json_array_index_object(layers, i);
+      if ( (get_json_integer_value(layer, "id") - 1) != i ) {
+	// TileD's map layer IDs start at 1, not 0, and are sequential but not necessarily contiguous. We may have a gap in IDs.
+	json_decref(layer);
+	continue;
+      }
       
-    dest->layers[i].opacity = get_json_number_value(layer, "opacity");
-    dest->layers[i].visible = get_json_boolean_value(layer, "visible");
-    dest->layers[i].id = get_json_integer_value(layer, "id");
-    dest->layers[i].x = get_json_integer_value(layer, "x");
-    dest->layers[i].y = get_json_integer_value(layer, "y");
+      dest->layers[i].opacity = get_json_number_value(layer, "opacity");
+      dest->layers[i].visible = get_json_boolean_value(layer, "visible");
+      dest->layers[i].id = get_json_integer_value(layer, "id");
+      dest->layers[i].x = get_json_integer_value(layer, "x");
+      dest->layers[i].y = get_json_integer_value(layer, "y");
       
-    TRY {
-	layertype = get_json_string_value(layer, "type");
-	if ( strncmp(layertype, "objectgroup", strlen(layertype)) == 0 ) {
+      TRY {
+	s = get_json_string_value(layer, "type");
+	if ( strncmp(s->data, "objectgroup", strlen(s->data)) == 0 ) {
 	  dest->layers[i].type = TILEMAP_LAYER_TYPE_OBJECTS;
 	  tilemap_load_layer_objects(dest, layer, i);
-	} else if ( strncmp(layertype, "tilelayer", strlen(layertype)) == 0 ) {
+	} else if ( strncmp(s->data, "tilelayer", strlen(s->data)) == 0 ) {
 	  dest->layers[i].type = TILEMAP_LAYER_TYPE_TILES;
 	  tilemap_load_layer_tile(dest, layer, i);
 	}
-    } FINALLY {
+      } FINALLY {
+	heap_release_string(s);
 	json_decref(layer);
-    } ETRY;
-  }
-  json_decref(layers);
+      } ETRY;
+    }
+  } FINALLY {
+    json_decref(layers);
+  } ETRY;
+  
 }
 
 void tilemap_load(char *fname, tilemap *dest)
@@ -280,12 +322,16 @@ void tilemap_load(char *fname, tilemap *dest)
 
   memset(dest, 0x00, sizeof(tilemap));
 
-  SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), fname);
-  json = json_load_file(asset_path, 0, &error);
-  if (!json) {
-    SDL_Log("Error while loading tilemap from %s on line %d: %s", asset_path, error.line, error.text);
-    THROW(EXC_NULLPOINTER, "Loading JSON tilemap failed");
-  }
+  TRY {
+    SDL_asprintf(&asset_path, "%s%s", SDL_GetBasePath(), fname);
+    json = json_load_file(asset_path, 0, &error);
+    if (!json) {
+      SDL_Log("Error while loading tilemap from %s on line %d: %s", asset_path, error.line, error.text);
+      THROW(EXC_NULLPOINTER, "Loading JSON tilemap failed");
+    }
+  } FINALLY {
+    SDL_free(asset_path);
+  } ETRY;
 
   TRY {
     dest->tileheight = get_json_integer_value(json, "tileheight");