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
|
/*
* Copyright (c) 1997 - 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"
RCSID("$Id: store_emem.c 22574 2008-02-05 20:31:55Z lha $");
typedef struct emem_storage{
unsigned char *base;
size_t size;
size_t len;
unsigned char *ptr;
}emem_storage;
static ssize_t
emem_fetch(krb5_storage *sp, void *data, size_t size)
{
emem_storage *s = (emem_storage*)sp->data;
if(s->base + s->len - s->ptr < size)
size = s->base + s->len - s->ptr;
memmove(data, s->ptr, size);
sp->seek(sp, size, SEEK_CUR);
return size;
}
static ssize_t
emem_store(krb5_storage *sp, const void *data, size_t size)
{
emem_storage *s = (emem_storage*)sp->data;
if(size > s->base + s->size - s->ptr){
void *base;
size_t sz, off;
off = s->ptr - s->base;
sz = off + size;
if (sz < 4096)
sz *= 2;
base = realloc(s->base, sz);
if(base == NULL)
return 0;
s->size = sz;
s->base = base;
s->ptr = (unsigned char*)base + off;
}
memmove(s->ptr, data, size);
sp->seek(sp, size, SEEK_CUR);
return size;
}
static off_t
emem_seek(krb5_storage *sp, off_t offset, int whence)
{
emem_storage *s = (emem_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;
if(offset > s->len)
s->len = offset;
break;
case SEEK_CUR:
sp->seek(sp,s->ptr - s->base + offset, SEEK_SET);
break;
case SEEK_END:
sp->seek(sp, s->len + offset, SEEK_SET);
break;
default:
errno = EINVAL;
return -1;
}
return s->ptr - s->base;
}
static void
emem_free(krb5_storage *sp)
{
emem_storage *s = sp->data;
memset(s->base, 0, s->len);
free(s->base);
}
krb5_storage * KRB5_LIB_FUNCTION
krb5_storage_emem(void)
{
krb5_storage *sp;
emem_storage *s;
sp = malloc(sizeof(krb5_storage));
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->size = 1024;
s->base = malloc(s->size);
if (s->base == NULL) {
free(sp);
free(s);
return NULL;
}
s->len = 0;
s->ptr = s->base;
sp->fetch = emem_fetch;
sp->store = emem_store;
sp->seek = emem_seek;
sp->free = emem_free;
return sp;
}
|
