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       1                 :            : // Copyright (C) 2010  Internet Systems Consortium, Inc. ("ISC")
       2                 :            : //
       3                 :            : // Permission to use, copy, modify, and/or distribute this software for any
       4                 :            : // purpose with or without fee is hereby granted, provided that the above
       5                 :            : // copyright notice and this permission notice appear in all copies.
       6                 :            : //
       7                 :            : // THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
       8                 :            : // REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
       9                 :            : // AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
      10                 :            : // INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
      11                 :            : // LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
      12                 :            : // OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
      13                 :            : // PERFORMANCE OF THIS SOFTWARE.
      14                 :            : 
      15                 :            : #include <cstring>
      16                 :            : 
      17                 :            : #include <config.h>
      18                 :            : #include "hash_key.h"
      19                 :            : 
      20                 :            : namespace isc {
      21                 :            : namespace nsas {
      22                 :            : 
      23                 :            : /// Hash Equality Function
      24                 :       2456 : bool HashKey::operator==(const isc::nsas::HashKey& other) {
      25                 :            : 
      26                 :            :     // Check key lengths
      27         [ +  + ]:       2456 :     if (other.keylen == keylen) {
      28                 :            : 
      29                 :            :         // ... and classes
      30         [ +  + ]:       2423 :         if (other.class_code == class_code) {
      31                 :            : 
      32                 :            :             // ... before the expensive operation.  This involves a
      33                 :            :             // byte-by-byte comparison, doing a case-independent match.
      34                 :            :             // memcmp() doesn't work (exact match) nor does strcmp or its
      35                 :            :             // variation (stops on the first null byte).
      36                 :            :             //
      37                 :            :             // TODO: Use a lookup table to map upper to lower case (for speed)
      38         [ +  + ]:      32258 :             for (uint32_t i = 0; i < other.keylen; ++i) {
      39         [ +  + ]:      29802 :                 if (tolower(static_cast<unsigned char>(other.key[i])) !=
      40                 :      29802 :                     tolower(static_cast<unsigned char>(key[i]))) {
      41                 :            :                     return false;   // Mismatch
      42                 :            :                 }
      43                 :            :             }
      44                 :            :             return true;    // All bytes matched
      45                 :            :         }
      46                 :            :     }
      47                 :            :     return false;   // Key length or class did not match
      48                 :            : }
      49                 :            : 
      50                 :            : } // namespace nsas
      51                 :            : } // namespace isc