add tests for gunzip

archival/bbunzip_test3.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+# Leak test for gunzip. Watch top for growing process size.
+# In this case we look for leaks in "concatenated .gz" code -
+# we feed gunzip with a stream of .gz files.
+
+i=$PID
+c=0
+while true; do
+    c=$((c + 1))
+    echo "Block# $c" >&2
+    # RANDOM is not very random on some shells. Spice it up.
+    i=$((i * 1664525 + 1013904223))
+    # 100003 is prime
+    len=$(( (((RANDOM*RANDOM)^i) & 0x7ffffff) % 100003 ))
+
+    # Just using urandom will make gzip use method 0 (store) -
+    # not good for test coverage!
+    cat /dev/urandom \
+    | while true; do read junk; echo "junk $c $i $junk"; done \
+    | dd bs=$len count=1 2>/dev/null \
+    | gzip >xxx.gz
+    cat xxx.gz xxx.gz xxx.gz xxx.gz xxx.gz xxx.gz xxx.gz xxx.gz
+done | ../busybox gunzip -c >/dev/null