1 static char *uncompress(int16_t field_count, char *start, char *end,
2       char *ptr, char *uncompressed, int uncomp_len,
3       char **uncompressed_ptr)
4 {
5   char *uptr = *uncompressed_ptr; /* position in result buffer */
6
7   debug("count %d ptr %p end %p uptr %p", field_count, ptr, end, uptr);
8
9   while (field_count-- > 0 && ptr < end) {
10     int dlen; /* data field length */
11     int ulen; /* uncompress length */
12     int pos; /* position in compressed string */
13     char name[NS_MAXLABEL]; /* tmp label */
14     uint16_t dns_type, dns_class;
15     int comp_pos;
16
17     if (!convert_label(start, end, ptr, name, NS_MAXLABEL,
18     &pos, &comp_pos))
19     goto out;
20
21     /*
22     * Copy the uncompressed resource record, type, class and \0 to
23     * tmp buffer.
24     */
25
26     ulen = strlen(name);
27     strncpy(uptr, name, uncomp_len - (uptr - uncompressed));
28
29     debug("pos %d ulen %d left %d name %s", pos, ulen,
30     (int)(uncomp_len - (uptr - uncompressed)), uptr);
31
32     uptr += ulen;
33     *uptr++ = '\0';
34
35     ptr += pos;
36
37     /*
38     * We copy also the fixed portion of the result (type, class,
39     * ttl, address length and the address)
40     */
41     memcpy(uptr, ptr, NS_RRFIXEDSZ);
42
43     dns_type = uptr[0] << 8 | uptr[1];
44     dns_class = uptr[2] << 8 | uptr[3];
45
46     if (dns_class != ns_c_in)
47     goto out;
48
49     ptr += NS_RRFIXEDSZ;
50     uptr += NS_RRFIXEDSZ;