Fixed a few warnings from -fsanitize=undefined

1 files changed, 8 insertions, 1 deletions

diff --git a/programs/lz4io.c b/programs/lz4io.c
index 991d9d7..278b766 100644
--- a/programs/lz4io.c
+++ b/programs/lz4io.c
@@ -487,8 +487,15 @@ int LZ4IO_compressFilename(const char* input_filename, const char* output_filena
     /* Final Status */
     end = clock();
     DISPLAYLEVEL(2, "\r%79s\r", "");
-    DISPLAYLEVEL(2, "Compressed %llu bytes into %llu bytes ==> %.2f%%\n",
+    if (filesize == 0)
+    {
+        DISPLAYLEVEL(2, "Null size input; converted into %u lz4 stream\n", (unsigned)compressedfilesize);
+    }
+    else
+    {
+        DISPLAYLEVEL(2, "Compressed %llu bytes into %llu bytes ==> %.2f%%\n",
         (unsigned long long) filesize, (unsigned long long) compressedfilesize, (double)compressedfilesize/filesize*100);
+    }
     {
         double seconds = (double)(end - start)/CLOCKS_PER_SEC;
         DISPLAYLEVEL(4, "Done in %.2f s ==> %.2f MB/s\n", seconds, (double)filesize / seconds / 1024 / 1024);