src/mesa/program/prog_hash_table.c

   1 /*
   2  * Copyright © 2008 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file hash_table.c
  26  * \brief Implementation of a generic, opaque hash table data type.
  27  *
  28  * \author Ian Romanick <ian.d.romanick@intel.com>
  29  */
  30
  31 #include "main/imports.h"
  32 #include "util/simple_list.h"
  33 #include "hash_table.h"
  34
  35 unsigned
  36 hash_table_string_hash(const void *key)
  37 {
  38     const char *str = (const char *) key;
  39     unsigned hash = 5381;
  40
  41
  42     while (*str != '\0') {
  43         hash = (hash * 33) + *str;
  44         str++;
  45     }
  46
  47     return hash;
  48 }
  49
  50 bool hash_table_string_compare(const void *a, const void *b)
  51 {
  52    return strcmp(a, b) == 0;
  53 }
  54
  55
  56 unsigned
  57 hash_table_pointer_hash(const void *key)
  58 {
  59    return (unsigned)((uintptr_t) key / sizeof(void *));
  60 }
  61
  62
  63 bool
  64 hash_table_pointer_compare(const void *key1, const void *key2)
  65 {
  66    return key1 == key2;
  67 }