more debug prints

jpeg_img.cpp

@@ -13,7 +13,8 @@ Image decompressJpegImage(const unsigned char* buffer, size_t size)
     jpeg_create_decompress( &info ); //fills info structure
 
     jpeg_mem_src(&info, buffer, size);
-    jpeg_read_header( &info, true );
+    if(jpeg_read_header(&info, true) !=  JPEG_HEADER_OK)
+        std::cerr<<"Could not read jpeg header";
 
     jpeg_start_decompress( &info );