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diff --git a/t/t5302-pack-index.sh b/t/t5302-pack-index.sh
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+#!/bin/sh
+#
+# Copyright (c) 2007 Nicolas Pitre
+#
+
+test_description='pack index with 64-bit offsets and object CRC'
+. ./test-lib.sh
+
+test_expect_success \
+ 'setup' \
+ 'rm -rf .git
+ git init &&
+ i=1 &&
+ while test $i -le 100
+ do
+ i=`printf '%03i' $i`
+ echo $i >file_$i &&
+ test-genrandom "$i" 8192 >>file_$i &&
+ git update-index --add file_$i &&
+ i=`expr $i + 1` || return 1
+ done &&
+ { echo 101 && test-genrandom 100 8192; } >file_101 &&
+ git update-index --add file_101 &&
+ tree=`git write-tree` &&
+ commit=`git commit-tree $tree </dev/null` && {
+ echo $tree &&
+ git ls-tree $tree | sed -e "s/.* \\([0-9a-f]*\\) .*/\\1/"
+ } >obj-list &&
+ git update-ref HEAD $commit'
+
+test_expect_success \
+ 'pack-objects with index version 1' \
+ 'pack1=$(git pack-objects --index-version=1 test-1 <obj-list) &&
+ git verify-pack -v "test-1-${pack1}.pack"'
+
+test_expect_success \
+ 'pack-objects with index version 2' \
+ 'pack2=$(git pack-objects --index-version=2 test-2 <obj-list) &&
+ git verify-pack -v "test-2-${pack2}.pack"'
+
+test_expect_success \
+ 'both packs should be identical' \
+ 'cmp "test-1-${pack1}.pack" "test-2-${pack2}.pack"'
+
+test_expect_success \
+ 'index v1 and index v2 should be different' \
+ '! cmp "test-1-${pack1}.idx" "test-2-${pack2}.idx"'
+
+test_expect_success \
+ 'index-pack with index version 1' \
+ 'git index-pack --index-version=1 -o 1.idx "test-1-${pack1}.pack"'
+
+test_expect_success \
+ 'index-pack with index version 2' \
+ 'git index-pack --index-version=2 -o 2.idx "test-1-${pack1}.pack"'
+
+test_expect_success \
+ 'index-pack results should match pack-objects ones' \
+ 'cmp "test-1-${pack1}.idx" "1.idx" &&
+ cmp "test-2-${pack2}.idx" "2.idx"'
+
+test_expect_success \
+ 'index v2: force some 64-bit offsets with pack-objects' \
+ 'pack3=$(git pack-objects --index-version=2,0x40000 test-3 <obj-list)'
+
+have_64bits=
+if msg=$(git verify-pack -v "test-3-${pack3}.pack" 2>&1) ||
+ ! (echo "$msg" | grep "pack too large .* off_t")
+then
+ have_64bits=t
+else
+ say "skipping tests concerning 64-bit offsets"
+fi
+
+test "$have_64bits" &&
+test_expect_success \
+ 'index v2: verify a pack with some 64-bit offsets' \
+ 'git verify-pack -v "test-3-${pack3}.pack"'
+
+test "$have_64bits" &&
+test_expect_success \
+ '64-bit offsets: should be different from previous index v2 results' \
+ '! cmp "test-2-${pack2}.idx" "test-3-${pack3}.idx"'
+
+test "$have_64bits" &&
+test_expect_success \
+ 'index v2: force some 64-bit offsets with index-pack' \
+ 'git index-pack --index-version=2,0x40000 -o 3.idx "test-1-${pack1}.pack"'
+
+test "$have_64bits" &&
+test_expect_success \
+ '64-bit offsets: index-pack result should match pack-objects one' \
+ 'cmp "test-3-${pack3}.idx" "3.idx"'
+
+test_expect_success \
+ '[index v1] 1) stream pack to repository' \
+ 'git index-pack --index-version=1 --stdin < "test-1-${pack1}.pack" &&
+ git prune-packed &&
+ git count-objects | ( read nr rest && test "$nr" -eq 1 ) &&
+ cmp "test-1-${pack1}.pack" ".git/objects/pack/pack-${pack1}.pack" &&
+ cmp "test-1-${pack1}.idx" ".git/objects/pack/pack-${pack1}.idx"'
+
+test_expect_success \
+ '[index v1] 2) create a stealth corruption in a delta base reference' \
+ '# this test assumes a delta smaller than 16 bytes at the end of the pack
+ git show-index <1.idx | sort -n | sed -ne \$p | (
+ read delta_offs delta_sha1 &&
+ git cat-file blob "$delta_sha1" > blob_1 &&
+ chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
+ dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($delta_offs + 1)) \
+ if=".git/objects/pack/pack-${pack1}.idx" skip=$((256 * 4 + 4)) \
+ bs=1 count=20 conv=notrunc &&
+ git cat-file blob "$delta_sha1" > blob_2 )'
+
+test_expect_success \
+ '[index v1] 3) corrupted delta happily returned wrong data' \
+ '! cmp blob_1 blob_2'
+
+test_expect_success \
+ '[index v1] 4) confirm that the pack is actually corrupted' \
+ 'test_must_fail git fsck --full $commit'
+
+test_expect_success \
+ '[index v1] 5) pack-objects happily reuses corrupted data' \
+ 'pack4=$(git pack-objects test-4 <obj-list) &&
+ test -f "test-4-${pack1}.pack"'
+
+test_expect_success \
+ '[index v1] 6) newly created pack is BAD !' \
+ 'test_must_fail git verify-pack -v "test-4-${pack1}.pack"'
+
+test_expect_success \
+ '[index v2] 1) stream pack to repository' \
+ 'rm -f .git/objects/pack/* &&
+ git index-pack --index-version=2 --stdin < "test-1-${pack1}.pack" &&
+ git prune-packed &&
+ git count-objects | ( read nr rest && test "$nr" -eq 1 ) &&
+ cmp "test-1-${pack1}.pack" ".git/objects/pack/pack-${pack1}.pack" &&
+ cmp "test-2-${pack1}.idx" ".git/objects/pack/pack-${pack1}.idx"'
+
+test_expect_success \
+ '[index v2] 2) create a stealth corruption in a delta base reference' \
+ '# this test assumes a delta smaller than 16 bytes at the end of the pack
+ git show-index <1.idx | sort -n | sed -ne \$p | (
+ read delta_offs delta_sha1 delta_crc &&
+ git cat-file blob "$delta_sha1" > blob_3 &&
+ chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
+ dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($delta_offs + 1)) \
+ if=".git/objects/pack/pack-${pack1}.idx" skip=$((8 + 256 * 4)) \
+ bs=1 count=20 conv=notrunc &&
+ git cat-file blob "$delta_sha1" > blob_4 )'
+
+test_expect_success \
+ '[index v2] 3) corrupted delta happily returned wrong data' \
+ '! cmp blob_3 blob_4'
+
+test_expect_success \
+ '[index v2] 4) confirm that the pack is actually corrupted' \
+ 'test_must_fail git fsck --full $commit'
+
+test_expect_success \
+ '[index v2] 5) pack-objects refuses to reuse corrupted data' \
+ 'test_must_fail git pack-objects test-5 <obj-list'
+
+test_expect_success \
+ '[index v2] 6) verify-pack detects CRC mismatch' \
+ 'rm -f .git/objects/pack/* &&
+ git index-pack --index-version=2 --stdin < "test-1-${pack1}.pack" &&
+ git verify-pack ".git/objects/pack/pack-${pack1}.pack" &&
+ chmod +w ".git/objects/pack/pack-${pack1}.idx" &&
+ dd if=/dev/zero of=".git/objects/pack/pack-${pack1}.idx" conv=notrunc \
+ bs=1 count=4 seek=$((8 + 256 * 4 + `wc -l <obj-list` * 20 + 0)) &&
+ ( while read obj
+ do git cat-file -p $obj >/dev/null || exit 1
+ done <obj-list ) &&
+ err=$(test_must_fail git verify-pack \
+ ".git/objects/pack/pack-${pack1}.pack" 2>&1) &&
+ echo "$err" | grep "CRC mismatch"'
+
+test_done