Fix function tesseract::write_set (issue tesseract-ocr#3925)

It crashed when running mftraining with fs.size() == 0. Signed-off-by: Stefan Weil <sw@weilnetz.de>
GerHobbelt · Jan 27, 2023 · 9c8a15f · 9c8a15f
1 parent b76c6ce
commit 9c8a15f
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/ccstruct/fontinfo.cpp b/src/ccstruct/fontinfo.cpp
@@ -221,7 +221,8 @@ bool write_spacing_info(FILE *f, const FontInfo &fi) {
 
 bool write_set(FILE *f, const FontSet &fs) {
   int size = fs.size();
-  return tesseract::Serialize(f, &size) && tesseract::Serialize(f, &fs[0], size);
+  return tesseract::Serialize(f, &size) &&
+         (size > 0 ? tesseract::Serialize(f, &fs[0], size) : true);
 }
 
 } // namespace tesseract.