Fix resolution parsing issue in HDR image header reading

- Added safety checks  for string to integer conversion.

include/imageinfo.hpp

@@ -642,7 +642,9 @@ inline bool try_gif(ReadInterface &ri, size_t length, ImageInfo &info) {
     );
     return true;
 }
-
+inline bool is_numeric(const std::string& str) {
+    return !str.empty() && std::all_of(str.begin(), str.end(), ::isdigit);
+}
 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 // http://paulbourke.net/dataformats/pic/
@@ -701,6 +703,8 @@ inline bool try_hdr(ReadInterface &ri, size_t length, ImageInfo &info) {
     }
     auto y_str = resolution.substr(p0 + 1, p1 - p0 - 1);
     auto x_str = resolution.substr(p2 + 1);
+    if( !is_numeric(x_str) || !is_numeric(y_str))
+        return false;
     info = ImageInfo(kFormatHdr, "hdr", "hdr", "image/vnd.radiance");
     info.set_size(         //
         std::stol(x_str),  //