1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright (c) 1997 - 2000, 2002 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
#include "store-int.h"
typedef struct mem_storage{
unsigned char *base;
size_t size;
unsigned char *ptr;
}mem_storage;
static ssize_t
mem_fetch(krb5_storage *sp, void *data, size_t size)
{
mem_storage *s = (mem_storage*)sp->data;
if(size > s->base + s->size - s->ptr)
size = s->base + s->size - s->ptr;
memmove(data, s->ptr, size);
sp->seek(sp, size, SEEK_CUR);
return size;
}
static ssize_t
mem_store(krb5_storage *sp, const void *data, size_t size)
{
mem_storage *s = (mem_storage*)sp->data;
if(size > s->base + s->size - s->ptr)
size = s->base + s->size - s->ptr;
memmove(s->ptr, data, size);
sp->seek(sp, size, SEEK_CUR);
return size;
}
static ssize_t
mem_no_store(krb5_storage *sp, const void *data, size_t size)
{
return -1;
}
static off_t
mem_seek(krb5_storage *sp, off_t offset, int whence)
{
mem_storage *s = (mem_storage*)sp->data;
switch(whence){
case SEEK_SET:
if(offset > s->size)
offset = s->size;
if(offset < 0)
offset = 0;
s->ptr = s->base + offset;
break;
case SEEK_CUR:
return sp->seek(sp, s->ptr - s->base + offset, SEEK_SET);
case SEEK_END:
return sp->seek(sp, s->size + offset, SEEK_SET);
default:
errno = EINVAL;
return -1;
}
return s->ptr - s->base;
}
static int
mem_trunc(krb5_storage *sp, off_t offset)
{
mem_storage *s = (mem_storage*)sp->data;
if(offset > s->size)
return ERANGE;
s->size = offset;
if ((s->ptr - s->base) > offset)
s->ptr = s->base + offset;
return 0;
}
static int
mem_no_trunc(krb5_storage *sp, off_t offset)
{
return EINVAL;
}
/**
* Create a fixed size memory storage block
*
* @return A krb5_storage on success, or NULL on out of memory error.
*
* @ingroup krb5_storage
*
* @sa krb5_storage_mem()
* @sa krb5_storage_from_readonly_mem()
* @sa krb5_storage_from_data()
* @sa krb5_storage_from_fd()
*/
KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_mem(void *buf, size_t len)
{
krb5_storage *sp = malloc(sizeof(krb5_storage));
mem_storage *s;
if(sp == NULL)
return NULL;
s = malloc(sizeof(*s));
if(s == NULL) {
free(sp);
return NULL;
}
sp->data = s;
sp->flags = 0;
sp->eof_code = HEIM_ERR_EOF;
s->base = buf;
s->size = len;
s->ptr = buf;
sp->fetch = mem_fetch;
sp->store = mem_store;
sp->seek = mem_seek;
sp->trunc = mem_trunc;
sp->free = NULL;
return sp;
}
/**
* Create a fixed size memory storage block
*
* @return A krb5_storage on success, or NULL on out of memory error.
*
* @ingroup krb5_storage
*
* @sa krb5_storage_mem()
* @sa krb5_storage_from_mem()
* @sa krb5_storage_from_readonly_mem()
* @sa krb5_storage_from_fd()
*/
KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_data(krb5_data *data)
{
return krb5_storage_from_mem(data->data, data->length);
}
/**
* Create a fixed size memory storage block that is read only
*
* @return A krb5_storage on success, or NULL on out of memory error.
*
* @ingroup krb5_storage
*
* @sa krb5_storage_mem()
* @sa krb5_storage_from_mem()
* @sa krb5_storage_from_data()
* @sa krb5_storage_from_fd()
*/
KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_readonly_mem(const void *buf, size_t len)
{
krb5_storage *sp = malloc(sizeof(krb5_storage));
mem_storage *s;
if(sp == NULL)
return NULL;
s = malloc(sizeof(*s));
if(s == NULL) {
free(sp);
return NULL;
}
sp->data = s;
sp->flags = 0;
sp->eof_code = HEIM_ERR_EOF;
s->base = rk_UNCONST(buf);
s->size = len;
s->ptr = rk_UNCONST(buf);
sp->fetch = mem_fetch;
sp->store = mem_no_store;
sp->seek = mem_seek;
sp->trunc = mem_no_trunc;
sp->free = NULL;
return sp;
}
|
