Image::loadJPEG() error handling

src/Image.cc

@@ -297,7 +297,11 @@ Image::loadPNG() {
 
 cairo_status_t
 Image::loadJPEG() {
+  // File stream
   FILE *stream = fopen(filename, "r");
+  if (!stream) return CAIRO_STATUS_READ_ERROR;
+
+  // JPEG setup
   struct jpeg_decompress_struct info;
   struct jpeg_error_mgr err;
   info.err = jpeg_std_error(&err);
@@ -308,10 +312,15 @@ Image::loadJPEG() {
   width = info.output_width;
   height = info.output_height;
 
+  // Data alloc
   int stride = width * 4;
   uint8_t *data = (uint8_t *) malloc(width * height * 4);
+  if (!data) return CAIRO_STATUS_NO_MEMORY;
+  
   uint8_t *src = (uint8_t *) malloc(width * 3);
+  if (!src) return CAIRO_STATUS_NO_MEMORY;
 
+  // Copy RGB -> ARGB
   for (int y = 0; y < height; ++y) {
     jpeg_read_scanlines(&info, &src, 1);
     uint32_t *row = (uint32_t *)(data + stride * y);
@@ -325,6 +334,7 @@ Image::loadJPEG() {
     }
   }
 
+  // New image surface
   _surface = cairo_image_surface_create_for_data(
       data
     , CAIRO_FORMAT_ARGB32
@@ -332,6 +342,7 @@ Image::loadJPEG() {
     , height
     , width * 4);
 
+  // Cleanup
   fclose(stream);
   jpeg_finish_decompress(&info);
   jpeg_destroy_decompress(&info);