40baeb16ad22c2574033500798cab518d0e61855
[openssl.git] / crypto / asn1 / a_d2i_fp.c
1 /* crypto/asn1/a_d2i_fp.c */
2 /* Copyright (C) 1995-1998 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 <openssl/buffer.h>
62 #include <openssl/asn1_mac.h>
63
64 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
65
66 #ifndef NO_OLD_ASN1
67 #ifndef OPENSSL_NO_FP_API
68
69 void *ASN1_d2i_fp(void *(*xnew)(void),
70                   void *(*d2i)(void **,const unsigned char **,long), FILE *in,
71                   void **x)
72         {
73         BIO *b;
74         void *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(void *(*xnew)(void),
89                    void *(*d2i)(void **,const unsigned char **,long), BIO *in,
90                    void **x)
91         {
92         BUF_MEM *b = NULL;
93         const unsigned char *p;
94         void *ret=NULL;
95         int len;
96
97         len = asn1_d2i_read_bio(in, &b);
98         if(len < 0) goto err;
99
100         p=b->data;
101         ret=d2i(x,&p,len);
102 err:
103         if (b != NULL) BUF_MEM_free(b);
104         return(ret);
105         }
106
107 #endif
108
109 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
110         {
111         BUF_MEM *b = NULL;
112         const unsigned char *p;
113         void *ret=NULL;
114         int len;
115
116         len = asn1_d2i_read_bio(in, &b);
117         if(len < 0) goto err;
118
119         p=(const unsigned char *)b->data;
120         ret=ASN1_item_d2i(x,&p,len, it);
121 err:
122         if (b != NULL) BUF_MEM_free(b);
123         return(ret);
124         }
125
126 #ifndef OPENSSL_NO_FP_API
127 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
128         {
129         BIO *b;
130         char *ret;
131
132         if ((b=BIO_new(BIO_s_file())) == NULL)
133                 {
134                 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
135                 return(NULL);
136                 }
137         BIO_set_fp(b,in,BIO_NOCLOSE);
138         ret=ASN1_item_d2i_bio(it,b,x);
139         BIO_free(b);
140         return(ret);
141         }
142 #endif
143
144 #define HEADER_SIZE   8
145 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
146         {
147         BUF_MEM *b;
148         unsigned char *p;
149         int i;
150         int ret=-1;
151         ASN1_const_CTX c;
152         int want=HEADER_SIZE;
153         int eos=0;
154 #if defined(__GNUC__) && defined(__ia64)
155         /* pathetic compiler bug in all known versions as of Nov. 2002 */
156         long off=0;
157 #else
158         int off=0;
159 #endif
160         int len=0;
161
162         b=BUF_MEM_new();
163         if (b == NULL)
164                 {
165                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
166                 return -1;
167                 }
168
169         ERR_clear_error();
170         for (;;)
171                 {
172                 if (want >= (len-off))
173                         {
174                         want-=(len-off);
175
176                         if (!BUF_MEM_grow_clean(b,len+want))
177                                 {
178                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
179                                 goto err;
180                                 }
181                         i=BIO_read(in,&(b->data[len]),want);
182                         if ((i < 0) && ((len-off) == 0))
183                                 {
184                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
185                                 goto err;
186                                 }
187                         if (i > 0)
188                                 len+=i;
189                         }
190                 /* else data already loaded */
191
192                 p=(unsigned char *)&(b->data[off]);
193                 c.p=p;
194                 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
195                         len-off);
196                 if (c.inf & 0x80)
197                         {
198                         unsigned long e;
199
200                         e=ERR_GET_REASON(ERR_peek_error());
201                         if (e != ASN1_R_TOO_LONG)
202                                 goto err;
203                         else
204                                 ERR_get_error(); /* clear error */
205                         }
206                 i=c.p-p;/* header length */
207                 off+=i; /* end of data */
208
209                 if (c.inf & 1)
210                         {
211                         /* no data body so go round again */
212                         eos++;
213                         want=HEADER_SIZE;
214                         }
215                 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
216                         {
217                         /* eos value, so go back and read another header */
218                         eos--;
219                         if (eos <= 0)
220                                 break;
221                         else
222                                 want=HEADER_SIZE;
223                         }
224                 else 
225                         {
226                         /* suck in c.slen bytes of data */
227                         want=(int)c.slen;
228                         if (want > (len-off))
229                                 {
230                                 want-=(len-off);
231                                 if (!BUF_MEM_grow_clean(b,len+want))
232                                         {
233                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
234                                         goto err;
235                                         }
236                                 while (want > 0)
237                                         {
238                                         i=BIO_read(in,&(b->data[len]),want);
239                                         if (i <= 0)
240                                                 {
241                                                 ASN1err(ASN1_F_ASN1_D2I_BIO,
242                                                     ASN1_R_NOT_ENOUGH_DATA);
243                                                 goto err;
244                                                 }
245                                         len+=i;
246                                         want -= i;
247                                         }
248                                 }
249                         off+=(int)c.slen;
250                         if (eos <= 0)
251                                 {
252                                 break;
253                                 }
254                         else
255                                 want=HEADER_SIZE;
256                         }
257                 }
258
259         *pb = b;
260         return off;
261 err:
262         if (b != NULL) BUF_MEM_free(b);
263         return(ret);
264         }