From 0eb0fb889e2e7e063e7dd8cbee38af106aa195f6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ren=C3=A9=20Scharfe?= Date: Wed, 1 Oct 2014 17:02:37 +0200 Subject: [PATCH] sha1-lookup: handle duplicates in sha1_pos() If the first 18 bytes of the SHA1's of all entries are the same then sha1_pos() dies and reports that the lower and upper limits of the binary search were the same that this wasn't supposed to happen. This is wrong because the remaining two bytes could still differ. Furthermore: It wouldn't be a problem if they actually were the same, i.e. if all entries have the same SHA1. The code already handles duplicates just fine. Simply remove the erroneous check. Signed-off-by: Rene Scharfe Acked-by: Jeff King Signed-off-by: Junio C Hamano --- sha1-lookup.c | 2 -- t/t0064-sha1-array.sh | 20 ++++++++++++++++++++ 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/sha1-lookup.c b/sha1-lookup.c index 2dd851598..5f069214d 100644 --- a/sha1-lookup.c +++ b/sha1-lookup.c @@ -84,8 +84,6 @@ int sha1_pos(const unsigned char *sha1, void *table, size_t nr, die("BUG: assertion failed in binary search"); } } - if (18 <= ofs) - die("cannot happen -- lo and hi are identical"); } do { diff --git a/t/t0064-sha1-array.sh b/t/t0064-sha1-array.sh index 06549656c..50b31ffe7 100755 --- a/t/t0064-sha1-array.sh +++ b/t/t0064-sha1-array.sh @@ -71,4 +71,24 @@ test_expect_success 'lookup non-existing entry with duplicates' ' test "$n" -lt 0 ' +test_expect_success 'lookup with almost duplicate values' ' + { + echo "append 5555555555555555555555555555555555555555" && + echo "append 555555555555555555555555555555555555555f" && + echo20 lookup 55 + } | test-sha1-array >actual && + n=$(cat actual) && + test "$n" -eq 0 +' + +test_expect_success 'lookup with single duplicate value' ' + { + echo20 append 55 55 && + echo20 lookup 55 + } | test-sha1-array >actual && + n=$(cat actual) && + test "$n" -ge 0 && + test "$n" -le 1 +' + test_done