base/data.c

   1 /*
   2  * Copyright (c) 2011 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "baselocl.h"
  35 #include <string.h>
  36
  37 static void
  38 data_dealloc(void *ptr)
  39 {
  40 }
  41
  42 static int
  43 data_cmp(void *a, void *b)
  44 {
  45     heim_octet_string *osa = a, *osb = b;
  46     if (osa->length != osb->length)
  47         return osa->length - osb->length;
  48     return memcmp(osa->data, osb->data, osa->length);
  49 }
  50
  51 static unsigned long
  52 data_hash(void *ptr)
  53 {
  54     heim_octet_string *os = ptr;
  55     const unsigned char *s = os->data;
  56
  57     if (os->length < 4)
  58         return os->length;
  59     return s[0] | (s[1] << 8) |
  60         (s[os->length - 2] << 16) | (s[os->length - 1] << 24);
  61 }
  62
  63 struct heim_type_data _heim_data_object = {
  64     HEIM_TID_DATA,
  65     "data-object",
  66     NULL,
  67     data_dealloc,
  68     NULL,
  69     data_cmp,
  70     data_hash
  71 };
  72
  73 /**
  74  * Create a data object
  75  *
  76  * @param string the string to create, must be an utf8 string
  77  *
  78  * @return string object
  79  */
  80
  81 heim_data_t
  82 heim_data_create(const void *data, size_t length)
  83 {
  84     heim_octet_string *os;
  85
  86     os = _heim_alloc_object(&_heim_data_object, sizeof(*os) + length);
  87     if (os) {
  88         os->data = (uint8_t *)os + sizeof(*os);
  89         os->length = length;
  90         memcpy(os->data, data, length);
  91     }
  92     return (heim_data_t)os;
  93 }
  94
  95 /**
  96  * Return the type ID of data objects
  97  *
  98  * @return type id of string objects
  99  */
 100
 101 heim_tid_t
 102 heim_data_get_type_id(void)
 103 {
 104     return HEIM_TID_DATA;
 105 }
 106
 107 /**
 108  * Get the data value of the content.
 109  *
 110  * @param data the data object to get the value from
 111  *
 112  * @return a heim_octet_string
 113  */
 114
 115 const heim_octet_string *
 116 heim_data_get_data(heim_data_t data)
 117 {
 118     return (const heim_octet_string *)data;
 119 }
 120
 121 const void *
 122 heim_data_get_ptr(heim_data_t data)
 123 {
 124     return ((const heim_octet_string *)data)->data;
 125 }
 126
 127 size_t  heim_data_get_length(heim_data_t data)
 128 {
 129     return ((const heim_octet_string *)data)->length;
 130 }