9d22778 (read-cache.c: write prefix-compressed names in the index -
2012-04-04) defined these. Interestingly, they were not used by
read-cache.c, or anywhere in that patch. They were used in
builtin/update-index.c later for checking supported index
versions. Use them here too.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 read-cache.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/read-cache.c b/read-cache.c
index 827ae55..298161f 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1260,7 +1260,8 @@ static int verify_hdr(struct cache_header *hdr, unsigned 
long size)
        if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
                return error("bad signature");
        hdr_version = ntohl(hdr->hdr_version);
-       if (hdr_version < 2 || 4 < hdr_version)
+       if (hdr_version < INDEX_FORMAT_LB ||
+           hdr_version > INDEX_FORMAT_UB)
                return error("bad index version %d", hdr_version);
        git_SHA1_Init(&c);
        git_SHA1_Update(&c, hdr, size - 20);
-- 
1.8.1.2.536.gf441e6d

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