alf: Don't try to compress 0-byte files.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/alf.c b/src/alf.c
index f77f8ad..bc38dd0 100644
--- a/src/alf.c
+++ b/src/alf.c
@@ -263,9 +263,16 @@ void crunch_file(const char *filename) {
 
 	/* read in entire input, couldn't do it this way on the Atari */
 	input_len = fread(input_buf, 1, MAX_INPUT_SIZE - 1, in_file);
+
 	if(!feof(in_file)) {
-		fprintf(stderr, "%s: this file is too large; only compressing the first 16MB.\n", self);
+		fprintf(stderr, "%s: %s: this file is too large; only compressing the first 16MB.\n", self, filename);
+	}
+
+	if(!input_len) {
+		fprintf(stderr, "%s: %s: can't compress a 0-byte (empty) file, skipping.\n", self, filename);
+		return;
 	}
+
 	output_len = 0;
 	fstat(fileno(in_file), &in_file_stat); /* for timestamp */
 	fclose(in_file);