tests: add more tests of gzip -cdf

* tests/mixed: Test "gzip -cdf" for a range of small uncompressed files.

diff --git a/tests/mixed b/tests/mixed
index 903a644f639f2bf8354f613a40508f7623419fd8..65898a1482d65ec40ff95bab5b22c53cf20b8e9f 100644 (file)
--- a/tests/mixed
+++ b/tests/mixed
@@ -50,4 +50,25 @@ compare out exp2 || fail=1
 gzip -cdf < in > out || fail=1
 compare out exp2 || fail=1
 
+in_str=0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-+=%
+for i in 0 1 2 3 4 5 6 7 8 9 a; do in_str="$in_str$in_str" ;done
+
+# Start with some small sizes.  $(seq 64)
+sizes=$(i=0; while :; do echo $i; test $i = 64; i=$(expr $i + 1) && break; done)
+
+# gzip's internal buffer size is 32KiB + 64 bytes:
+sizes="$sizes 32831 32832 32833"
+
+# 128KiB, +/- 1
+sizes="$sizes 131071 131072 131073"
+
+# Ensure that "gzip -cdf" acts like cat, for a range of small input files.
+i=0
+for i in $sizes; do
+  echo $i
+  printf %$i.${i}s $in_str > in
+  gzip -cdf < in > out
+  compare in out || fail=1
+done
+
 Exit $fail