t0021/rot13-filter: add packet_initialize()

diff --git a/packfile.c b/packfile.c
index f69a5c8d607af191fa8ba04e84da8f02c40823ef..4a5fe7ab1883843a389ce74bf1c7bd89890d8e51 100644 (file)
--- a/packfile.c
+++ b/packfile.c
@@ -442,6 +442,7 @@ static int open_packed_git_1(struct packed_git *p)
        unsigned char sha1[20];
        unsigned char *idx_sha1;
        long fd_flag;
+       ssize_t read_result;
 
        if (!p->index_data && open_pack_index(p))
                return error("packfile %s index unavailable", p->pack_name);
@@ -483,7 +484,10 @@ static int open_packed_git_1(struct packed_git *p)
                return error("cannot set FD_CLOEXEC");
 
        /* Verify we recognize this pack file format. */
-       if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
+       read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr));
+       if (read_result < 0)
+               return error_errno("error reading from %s", p->pack_name);
+       if (read_result != sizeof(hdr))
                return error("file %s is far too short to be a packfile", p->pack_name);
        if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
                return error("file %s is not a GIT packfile", p->pack_name);
@@ -500,7 +504,10 @@ static int open_packed_git_1(struct packed_git *p)
                             p->num_objects);
        if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
                return error("end of packfile %s is unavailable", p->pack_name);
-       if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
+       read_result = read_in_full(p->pack_fd, sha1, sizeof(sha1));
+       if (read_result < 0)
+               return error_errno("error reading from %s", p->pack_name);
+       if (read_result != sizeof(sha1))
                return error("packfile %s signature is unavailable", p->pack_name);
        idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
        if (hashcmp(sha1, idx_sha1))
@@ -1736,7 +1743,7 @@ off_t find_pack_entry_one(const unsigned char *sha1,
                       sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
 
        while (lo < hi) {
-               unsigned mi = (lo + hi) / 2;
+               unsigned mi = lo + (hi - lo) / 2;
                int cmp = hashcmp(index + mi * stride, sha1);
 
                if (debug_lookup)