Function match_accept_content_encoding

src/iocore/cache/HttpTransactCache.cc:858–903

TODO: This used to take a length for c_raw, but that was never used, so removed it from the prototype.

// TODO: This used to take a length for c_raw, but that was never used, so removed it from the prototype.
static inline bool
match_accept_content_encoding(const char *c_raw, MIMEField *accept_field, bool *wildcard_present, float *wildcard_q, float *q)
{
  Str        *a_value;
  const char *a_raw;
  StrList     a_values_list;

  if (!accept_field) {
    return false;
  }
  // loop over Accept-Encoding elements, looking for match //
  // TODO: Should we check the return value (count) here?
  accept_field->value_get_comma_list(&a_values_list);

  for (a_value = a_values_list.head; a_value; a_value = a_value->next) {
    char   *a_encoding = nullptr;
    StrList a_param_list;

    // Get the raw string to the current comma-sep Accept-Charset field value
    a_raw = a_value->str;

    // break Accept-Encoding piece into semi-colon separated parts //
    HttpCompat::parse_semicolon_list(&a_param_list, a_raw);
    if (a_param_list.head) {
      a_encoding = const_cast<char *>(a_param_list.head->str);
    } else {
      continue;
    }

    if (is_asterisk(a_encoding)) {
      *wildcard_present = true;
      *wildcard_q       = HttpCompat::find_Q_param_in_strlist(&a_param_list);
      return true;
    } else if (does_encoding_match(a_encoding, c_raw)) {
      // if type matches, get the Q factor //
      float tq;
      tq = HttpCompat::find_Q_param_in_strlist(&a_param_list);
      *q = (tq > *q ? tq : *q);

      return true;
    } else {
      // so this c_raw value did not match this a_raw value. big deal.
    }
  }
  return false;
}

float
HttpTransactCache::calculate_quality_of_accept_encoding_match(MIMEField *accept_field, MIMEField *content_field,