add tests for gunzip

1 files changed, 61 insertions, 0 deletions

diff --git a/archival/bbunzip_test.sh b/archival/bbunzip_test.sh
new file mode 100644
index 0000000..b8e31bf
--- /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