[GitHub] [nifi-minifi-cpp] szaszm commented on a change in pull request #1036: MINIFICPP-1352 Fix warnings in JNI and Sensors extensions

[GitBox <gi...@apache.org>]

szaszm commented on a change in pull request #1036:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1036#discussion_r600419189



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File path: extensions/jni/jvm/JniReferenceObjects.h
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@@ -142,7 +142,7 @@ class JniByteInputStream : public minifi::InputStreamCallback {
     int read = 0;
     do {
 
-      int actual = (int) stream_->read(buffer_, remaining <= buffer_size_ ? remaining : buffer_size_);
+      int actual = (int) stream_->read(buffer_, gsl::narrow<uint64_t>(remaining) <= buffer_size_ ? remaining : buffer_size_);

Review comment:
       In any of these cases, we need to add a precondition (`gsl_Expects`) that `size` must not be negative, for the narrowing to be safe. I know that the behavior is identical, but crashing because of narrowing error looks accidental, while a precondition clearly communicates the intent.
   
   




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