Commit 327b0361 for libheif

commit 327b0361aa21d8ceb1f16e186c6a10dd579527b2
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Tue May 19 14:46:28 2026 +0200

    PNG: show the same EXIF write error as for JPEG

diff --git a/heifio/encoder_png.cc b/heifio/encoder_png.cc
index d35c1ecf..f103ec88 100644
--- a/heifio/encoder_png.cc
+++ b/heifio/encoder_png.cc
@@ -140,7 +140,10 @@ bool PngEncoder::Encode(const heif_image_handle* handle,
     if (exifdata) {
       if (exifsize > 4) {
         uint32_t skip = four_bytes_to_uint32(exifdata[0], exifdata[1], exifdata[2], exifdata[3]);
-        if (skip < (exifsize - 4)) {
+        if (skip > (exifsize - 4)) {
+          fprintf(stderr, "Invalid EXIF data (offset too large)\n");
+        }
+        else {
           skip += 4;
           uint8_t* ptr = exifdata + skip;
           size_t size = exifsize - skip;