From d21f596ddb294bdb65623ba1d0e49b17d0829229 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Fri, 5 Oct 2007 15:27:03 +0000
Subject: [PATCH] add tests for gunzip

---
 archival/bbunzip_test.sh  | 61 +++++++++++++++++++++++++++++++++++++++
 archival/bbunzip_test2.sh | 10 +++++++
 archival/bbunzip_test3.sh | 23 +++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 archival/bbunzip_test.sh
 create mode 100644 archival/bbunzip_test2.sh
 create mode 100644 archival/bbunzip_test3.sh

diff --git a/archival/bbunzip_test.sh b/archival/bbunzip_test.sh
new file mode 100644
index 000000000..b8e31bf97
--- /dev/null
+++ b/archival/bbunzip_test.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+# Test that concatenated gz files are unpacking correctly.
+# It also tests that unpacking in general is working right.
+# Since zip code has many corner cases, run it for a few hours
+# to get a decent coverage (200000 tests or more).
+
+gzip="gzip"
+gunzip="../busybox gunzip"
+# Or the other way around:
+#gzip="../busybox gzip"
+#gunzip="gunzip"
+
+c=0
+i=$PID
+while true; do
+    c=$((c+1))
+
+    # RANDOM is not very random on some shells. Spice it up.
+    # 100003 is prime
+    len1=$(( (((RANDOM*RANDOM)^i) & 0x7ffffff) % 100003 ))
+    i=$((i * 1664525 + 1013904223))
+    len2=$(( (((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 $junk"; done \
+    | dd bs=$len1 count=1 >z1 2>/dev/null
+    cat /dev/urandom | while true; do read junk; echo "junk $c $i $junk"; done \
+    | dd bs=$len2 count=1 >z2 2>/dev/null
+
+    $gzip <z1 >zz.gz
+    $gzip <z2 >>zz.gz
+    $gunzip -c zz.gz >z9 || {
+	echo "Exitcode $?"
+	exit
+    }
+    sum=`cat z1 z2 | md5sum`
+    sum9=`md5sum <z9`
+    test "$sum" == "$sum9" || {
+	echo "md5sums don't match"
+	exit
+    }
+    echo "Test $c ok: len1=$len1 len2=$len2 sum=$sum"
+
+    sum=`cat z1 z2 z1 z2 | md5sum`
+    rm z1.gz z2.gz 2>/dev/null
+    $gzip z1
+    $gzip z2
+    cat z1.gz z2.gz z1.gz z2.gz >zz.gz
+    $gunzip -c zz.gz >z9 || {
+	echo "Exitcode $? (2)"
+	exit
+    }
+    sum9=`md5sum <z9`
+    test "$sum" == "$sum9" || {
+	echo "md5sums don't match (1)"
+	exit
+    }
+
+    echo "Test $c ok: len1=$len1 len2=$len2 sum=$sum (2)"
+done
diff --git a/archival/bbunzip_test2.sh b/archival/bbunzip_test2.sh
new file mode 100644
index 000000000..5b7e83e13
--- /dev/null
+++ b/archival/bbunzip_test2.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+# Leak test for gunzip. Watch top for growing process size.
+
+# 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 $RANDOM $junk"; done \
+| ../busybox gzip \
+| ../busybox gunzip -c >/dev/null
diff --git a/archival/bbunzip_test3.sh b/archival/bbunzip_test3.sh
new file mode 100644
index 000000000..2dc4afda1
--- /dev/null
+++ b/archival/bbunzip_test3.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+# Leak test for gunzip. Watch top for growing process size.
+# In this case we look for leaks in "concatenated .gz" code -
+# we feed gunzip with a stream of .gz files.
+
+i=$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