1/*
2 * Copyright (c) 1997 - 2007 Kungliga Tekniska H�gskolan
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 "krb5_locl.h"
35
36RCSID("$Id: data.c 22064 2007-11-11 16:28:14Z lha $");
37
38/**
39 * Reset the (potentially uninitalized) krb5_data structure.
40 *
41 * @param p krb5_data to reset.
42 *
43 * @ingroup krb5
44 */
45
46void KRB5_LIB_FUNCTION
47krb5_data_zero(krb5_data *p)
48{
49    p->length = 0;
50    p->data   = NULL;
51}
52
53/**
54 * Free the content of krb5_data structure, its ok to free a zeroed
55 * structure. When done, the structure will be zeroed.
56 *
57 * @param p krb5_data to free.
58 *
59 * @ingroup krb5
60 */
61
62void KRB5_LIB_FUNCTION
63krb5_data_free(krb5_data *p)
64{
65    if(p->data != NULL)
66	free(p->data);
67    krb5_data_zero(p);
68}
69
70/**
71 * Same as krb5_data_free().
72 *
73 * @param context Kerberos 5 context.
74 * @param data krb5_data to free.
75 *
76 * @ingroup krb5
77 */
78
79void KRB5_LIB_FUNCTION
80krb5_free_data_contents(krb5_context context, krb5_data *data)
81{
82    krb5_data_free(data);
83}
84
85/**
86 * Free krb5_data (and its content).
87 *
88 * @param context Kerberos 5 context.
89 * @param p krb5_data to free.
90 *
91 * @ingroup krb5
92 */
93
94void KRB5_LIB_FUNCTION
95krb5_free_data(krb5_context context,
96	       krb5_data *p)
97{
98    krb5_data_free(p);
99    free(p);
100}
101
102/**
103 * Allocate data of and krb5_data.
104 *
105 * @param p krb5_data to free.
106 * @param len size to allocate.
107 *
108 * @return Returns 0 to indicate success. Otherwise an kerberos et
109 * error code is returned.
110 *
111 * @ingroup krb5
112 */
113
114krb5_error_code KRB5_LIB_FUNCTION
115krb5_data_alloc(krb5_data *p, int len)
116{
117    p->data = malloc(len);
118    if(len && p->data == NULL)
119	return ENOMEM;
120    p->length = len;
121    return 0;
122}
123
124/**
125 * Grow (or shrink) the content of krb5_data to a new size.
126 *
127 * @param p krb5_data to free.
128 * @param len new size.
129 *
130 * @return Returns 0 to indicate success. Otherwise an kerberos et
131 * error code is returned.
132 *
133 * @ingroup krb5
134 */
135
136krb5_error_code KRB5_LIB_FUNCTION
137krb5_data_realloc(krb5_data *p, int len)
138{
139    void *tmp;
140    tmp = realloc(p->data, len);
141    if(len && !tmp)
142	return ENOMEM;
143    p->data = tmp;
144    p->length = len;
145    return 0;
146}
147
148/**
149 * Copy the data of len into the krb5_data.
150 *
151 * @param p krb5_data to copy into.
152 * @param data data to copy..
153 * @param len new size.
154 *
155 * @return Returns 0 to indicate success. Otherwise an kerberos et
156 * error code is returned.
157 *
158 * @ingroup krb5
159 */
160
161krb5_error_code KRB5_LIB_FUNCTION
162krb5_data_copy(krb5_data *p, const void *data, size_t len)
163{
164    if (len) {
165	if(krb5_data_alloc(p, len))
166	    return ENOMEM;
167	memmove(p->data, data, len);
168    } else
169	p->data = NULL;
170    p->length = len;
171    return 0;
172}
173
174/**
175 * Copy the data into a newly allocated krb5_data.
176 *
177 * @param context Kerberos 5 context.
178 * @param indata the krb5_data data to copy
179 * @param outdata new krb5_date to copy too. Free with krb5_free_data().
180 *
181 * @return Returns 0 to indicate success. Otherwise an kerberos et
182 * error code is returned.
183 *
184 * @ingroup krb5
185 */
186
187krb5_error_code KRB5_LIB_FUNCTION
188krb5_copy_data(krb5_context context,
189	       const krb5_data *indata,
190	       krb5_data **outdata)
191{
192    krb5_error_code ret;
193    ALLOC(*outdata, 1);
194    if(*outdata == NULL) {
195	krb5_set_error_string(context, "malloc: out of memory");
196	return ENOMEM;
197    }
198    ret = der_copy_octet_string(indata, *outdata);
199    if(ret) {
200	krb5_clear_error_string (context);
201	free(*outdata);
202	*outdata = NULL;
203    }
204    return ret;
205}
206
207/**
208 * Compare to data.
209 *
210 * @param data1 krb5_data to compare
211 * @param data2 krb5_data to compare
212 *
213 * @return return the same way as memcmp(), useful when sorting.
214 *
215 * @ingroup krb5
216 */
217
218int KRB5_LIB_FUNCTION
219krb5_data_cmp(const krb5_data *data1, const krb5_data *data2)
220{
221    if (data1->length != data2->length)
222	return data1->length - data2->length;
223    return memcmp(data1->data, data2->data, data1->length);
224}
225