/**
* Is the X-Alt header really holding a collection of IP:port (with possible
* push alt-locs containing a prefixing GUID) or is it mistakenly called
* X-Alt but is really an old X-Gnutella-Alternate-Location containing a
* list of HTTP URLs.
*/
static bool
huge_is_pure_xalt(const char *value, size_t len)
{
host_addr_t addr;
/*
* This is pure heuristics, knowing that if we return TRUE, we'll parse
* the X-Alt header in the format that is emitted by the majority of
* vendors.
*
* We try to avoid the more costly pattern_qsearch() call if we can,
* and our heuristic should catch 99% of the cases. And pattern_qsearch()
* should quickly return true if the X-Alt is not a collection of IP:port.
*/
if (is_strcaseprefix(value, "tls="))
return TRUE;
if (string_to_host_addr(value, NULL, &addr))
return TRUE;
if (pattern_qsearch(has_http_urls, value, len, 0, qs_any))
return FALSE;
return TRUE;
}
/**
* Apply pattern matching on text, matching at the *beginning* of words.
* Patterns are lazily compiled as needed, using pattern_compile_fast().
*/
static gboolean
entry_match(const char *text, size_t tlen,
cpattern_t **pw, word_vec_t *wovec, size_t wn)
{
size_t i;
for (i = 0; i < wn; i++) {
size_t j, offset = 0, amount = wovec[i].amount;
if (pw[i] == NULL)
pw[i] = pattern_compile_fast(wovec[i].word, wovec[i].len);
for (j = 0; j < amount; j++) {
const char *pos;
pos = pattern_qsearch(pw[i], text, tlen, offset, qs_begin);
if (pos)
offset = (pos - text) + pw[i]->len;
else
break;
}
if (j != amount) /* Word does not occur as many time as we want */
return FALSE;
}
return TRUE;
}
