Import of old SSLeay release: SSLeay 0.8.1b
[openssl.git] / crypto / asn1 / a_d2i_fp.c
1 /* crypto/asn1/a_d2i_fp.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include "buffer.h"
62 #include "asn1_mac.h"
63
64 #define HEADER_SIZE   8
65
66 #ifndef WIN16
67 char *ASN1_d2i_fp(xnew,d2i,in,x)
68 char *(*xnew)();
69 char *(*d2i)();
70 FILE *in;
71 unsigned char **x;
72         {
73         BIO *b;
74         char *ret;
75
76         if ((b=BIO_new(BIO_s_file())) == NULL)
77                 {
78                 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
79                 return(NULL);
80                 }
81         BIO_set_fp(b,in,BIO_NOCLOSE);
82         ret=ASN1_d2i_bio(xnew,d2i,b,x);
83         BIO_free(b);
84         return(ret);
85         }
86 #endif
87
88 char *ASN1_d2i_bio(xnew,d2i,in,x)
89 char *(*xnew)();
90 char *(*d2i)();
91 BIO *in;
92 unsigned char **x;
93         {
94         BUF_MEM *b;
95         unsigned char *p;
96         int i;
97         char *ret=NULL;
98         ASN1_CTX c;
99         int want=HEADER_SIZE;
100         int eos=0;
101         int off=0;
102         int len=0;
103
104         b=BUF_MEM_new();
105         if (b == NULL)
106                 {
107                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
108                 return(NULL);
109                 }
110
111         for (;;)
112                 {
113                 if (want >= (len-off))
114                         {
115                         want-=(len-off);
116
117                         if (!BUF_MEM_grow(b,len+want))
118                                 {
119                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
120                                 goto err;
121                                 }
122                         i=BIO_read(in,&(b->data[len]),want);
123                         if ((i < 0) && ((len-off) == 0))
124                                 {
125                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
126                                 goto err;
127                                 }
128                         if (i > 0)
129                                 len+=i;
130                         }
131                 /* else data already loaded */
132
133                 p=(unsigned char *)&(b->data[off]);
134                 c.p=p;
135                 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
136                         len-off);
137                 if (c.inf & 0x80)
138                         {
139                         unsigned long e;
140
141                         e=ERR_GET_REASON(ERR_peek_error());
142                         if (e != ASN1_R_TOO_LONG)
143                                 goto err;
144                         else
145                                 ERR_get_error(); /* clear error */
146                         }
147                 i=c.p-p;/* header length */
148                 off+=i; /* end of data */
149
150                 if (c.inf & 1)
151                         {
152                         /* no data body so go round again */
153                         eos++;
154                         want=HEADER_SIZE;
155                         }
156                 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
157                         {
158                         /* eos value, so go back and read another header */
159                         eos--;
160                         if (eos <= 0)
161                                 break;
162                         else
163                                 want=HEADER_SIZE;
164                         }
165                 else 
166                         {
167                         /* suck in c.slen bytes of data */
168                         want=(int)c.slen;
169                         if (want > (len-off))
170                                 {
171                                 want-=(len-off);
172                                 if (!BUF_MEM_grow(b,len+want))
173                                         {
174                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
175                                         goto err;
176                                         }
177                                 i=BIO_read(in,&(b->data[len]),want);
178                                 if (i <= 0)
179                                         {
180                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
181                                         goto err;
182                                         }
183                                 len+=i;
184                                 }
185                         off+=(int)c.slen;
186                         if (eos <= 0)
187                                 {
188                                 break;
189                                 }
190                         else
191                                 want=HEADER_SIZE;
192                         }
193                 }
194
195         p=(unsigned char *)b->data;
196         ret=d2i(x,&p,off);
197 err:
198         if (b != NULL) BUF_MEM_free(b);
199         return(ret);
200         }