2 * Copyright (c) 1997 - 2000, 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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34 #include "krb5_locl.h"
35 #include "store-int.h"
37 typedef struct mem_storage
{
44 mem_fetch(krb5_storage
*sp
, void *data
, size_t size
)
46 mem_storage
*s
= (mem_storage
*)sp
->data
;
47 if(size
> s
->base
+ s
->size
- s
->ptr
)
48 size
= s
->base
+ s
->size
- s
->ptr
;
49 memmove(data
, s
->ptr
, size
);
50 sp
->seek(sp
, size
, SEEK_CUR
);
55 mem_store(krb5_storage
*sp
, const void *data
, size_t size
)
57 mem_storage
*s
= (mem_storage
*)sp
->data
;
58 if(size
> s
->base
+ s
->size
- s
->ptr
)
59 size
= s
->base
+ s
->size
- s
->ptr
;
60 memmove(s
->ptr
, data
, size
);
61 sp
->seek(sp
, size
, SEEK_CUR
);
66 mem_no_store(krb5_storage
*sp
, const void *data
, size_t size
)
72 mem_seek(krb5_storage
*sp
, off_t offset
, int whence
)
74 mem_storage
*s
= (mem_storage
*)sp
->data
;
81 s
->ptr
= s
->base
+ offset
;
84 return sp
->seek(sp
, s
->ptr
- s
->base
+ offset
, SEEK_SET
);
86 return sp
->seek(sp
, s
->size
+ offset
, SEEK_SET
);
91 return s
->ptr
- s
->base
;
95 mem_trunc(krb5_storage
*sp
, off_t offset
)
97 mem_storage
*s
= (mem_storage
*)sp
->data
;
101 if ((s
->ptr
- s
->base
) > offset
)
102 s
->ptr
= s
->base
+ offset
;
107 mem_no_trunc(krb5_storage
*sp
, off_t offset
)
113 * Create a fixed size memory storage block
115 * @return A krb5_storage on success, or NULL on out of memory error.
117 * @ingroup krb5_storage
119 * @sa krb5_storage_mem()
120 * @sa krb5_storage_from_readonly_mem()
121 * @sa krb5_storage_from_data()
122 * @sa krb5_storage_from_fd()
125 KRB5_LIB_FUNCTION krb5_storage
* KRB5_LIB_CALL
126 krb5_storage_from_mem(void *buf
, size_t len
)
128 krb5_storage
*sp
= malloc(sizeof(krb5_storage
));
132 s
= malloc(sizeof(*s
));
139 sp
->eof_code
= HEIM_ERR_EOF
;
143 sp
->fetch
= mem_fetch
;
144 sp
->store
= mem_store
;
146 sp
->trunc
= mem_trunc
;
152 * Create a fixed size memory storage block
154 * @return A krb5_storage on success, or NULL on out of memory error.
156 * @ingroup krb5_storage
158 * @sa krb5_storage_mem()
159 * @sa krb5_storage_from_mem()
160 * @sa krb5_storage_from_readonly_mem()
161 * @sa krb5_storage_from_fd()
164 KRB5_LIB_FUNCTION krb5_storage
* KRB5_LIB_CALL
165 krb5_storage_from_data(krb5_data
*data
)
167 return krb5_storage_from_mem(data
->data
, data
->length
);
171 * Create a fixed size memory storage block that is read only
173 * @return A krb5_storage on success, or NULL on out of memory error.
175 * @ingroup krb5_storage
177 * @sa krb5_storage_mem()
178 * @sa krb5_storage_from_mem()
179 * @sa krb5_storage_from_data()
180 * @sa krb5_storage_from_fd()
183 KRB5_LIB_FUNCTION krb5_storage
* KRB5_LIB_CALL
184 krb5_storage_from_readonly_mem(const void *buf
, size_t len
)
186 krb5_storage
*sp
= malloc(sizeof(krb5_storage
));
190 s
= malloc(sizeof(*s
));
197 sp
->eof_code
= HEIM_ERR_EOF
;
198 s
->base
= rk_UNCONST(buf
);
200 s
->ptr
= rk_UNCONST(buf
);
201 sp
->fetch
= mem_fetch
;
202 sp
->store
= mem_no_store
;
204 sp
->trunc
= mem_no_trunc
;