XSUM_hashStream exits on file read errors, breaks multiple input processing

[ZoomRmc]

xxHash/cli/xxhsum.c

Lines 279 to 281 in bab7e27

	if (ferror(inFile)) {
	XSUM_log("Error: a failure occurred reading the input file.\n");
	exit(1);

XSUM_hashStream exits on ferror with the Error: a failure occurred reading the input file. message.
This prevents processing multiple input files.

In my case, finding FS/device errors was exactly the point of running xxhsum. When processing files in batches and parsing the output, if the process exited prematurely, the whole batch was marked as failed which resulted in great number of false negatives.

[Cyan4973]

It requires updating XSUM_hashStream() so that it can return an error. Right now, it can only return successfully, and therefore it exit() when it can't.

[ZoomRmc]

Sure.
If fixing this is not planned, the docs should mention that outputting any result for every input file is not guaranteed.