commit 1dd4e86283423fc6cd24c1f230e409718a21ed37
author Wan-Teh Chang <wtc@google.com> Mon Oct 12 16:52:50 2020 -0700
committer Joe Drago <joedrago@gmail.com> Wed Oct 14 11:33:38 2020 -0700
tree 70c9f957d8e055dbea3b9640ef9ba94bc42b75c9
parent 31c7c1a27b03c72436e5d657bbe0fea2e635671d

Detect file read error by calling ferror()

If fread() returns a byte count less than 'size', distinguish between
the error and end-of-file conditions by calling ferror().

src/io.c

diff --git a/src/io.c b/src/io.c
index 341f29d..29f3008 100644
--- a/src/io.c
+++ b/src/io.c
@@ -110,6 +110,9 @@
         }
         size_t bytesRead = fread(reader->buffer.data, 1, size, reader->f);
         if (size != bytesRead) {
+            if (ferror(reader->f)) {
+                return AVIF_RESULT_IO_ERROR;
+            }
             size = bytesRead;
         }
     }