Simplicate and add lightness.
[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), d2i_of_void *d2i, FILE *in, void **x)
70         {
71         BIO *b;
72         void *ret;
73
74         if ((b=BIO_new(BIO_s_file())) == NULL)
75                 {
76                 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
77                 return(NULL);
78                 }
79         BIO_set_fp(b,in,BIO_NOCLOSE);
80         ret=ASN1_d2i_bio(xnew,d2i,b,x);
81         BIO_free(b);
82         return(ret);
83         }
84 #endif
85
86 void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x)
87         {
88         BUF_MEM *b = NULL;
89         const unsigned char *p;
90         void *ret=NULL;
91         int len;
92
93         len = asn1_d2i_read_bio(in, &b);
94         if(len < 0) goto err;
95
96         p=b->data;
97         ret=d2i(x,&p,len);
98 err:
99         if (b != NULL) BUF_MEM_free(b);
100         return(ret);
101         }
102
103 #endif
104
105 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
106         {
107         BUF_MEM *b = NULL;
108         const unsigned char *p;
109         void *ret=NULL;
110         int len;
111
112         len = asn1_d2i_read_bio(in, &b);
113         if(len < 0) goto err;
114
115         p=(const unsigned char *)b->data;
116         ret=ASN1_item_d2i(x,&p,len, it);
117 err:
118         if (b != NULL) BUF_MEM_free(b);
119         return(ret);
120         }
121
122 #ifndef OPENSSL_NO_FP_API
123 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
124         {
125         BIO *b;
126         char *ret;
127
128         if ((b=BIO_new(BIO_s_file())) == NULL)
129                 {
130                 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
131                 return(NULL);
132                 }
133         BIO_set_fp(b,in,BIO_NOCLOSE);
134         ret=ASN1_item_d2i_bio(it,b,x);
135         BIO_free(b);
136         return(ret);
137         }
138 #endif
139
140 #define HEADER_SIZE   8
141 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
142         {
143         BUF_MEM *b;
144         unsigned char *p;
145         int i;
146         int ret=-1;
147         ASN1_const_CTX c;
148         int want=HEADER_SIZE;
149         int eos=0;
150 #if defined(__GNUC__) && defined(__ia64)
151         /* pathetic compiler bug in all known versions as of Nov. 2002 */
152         long off=0;
153 #else
154         int off=0;
155 #endif
156         int len=0;
157
158         b=BUF_MEM_new();
159         if (b == NULL)
160                 {
161                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
162                 return -1;
163                 }
164
165         ERR_clear_error();
166         for (;;)
167                 {
168                 if (want >= (len-off))
169                         {
170                         want-=(len-off);
171
172                         if (!BUF_MEM_grow_clean(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) && ((len-off) == 0))
179                                 {
180                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
181                                 goto err;
182                                 }
183                         if (i > 0)
184                                 len+=i;
185                         }
186                 /* else data already loaded */
187
188                 p=(unsigned char *)&(b->data[off]);
189                 c.p=p;
190                 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
191                         len-off);
192                 if (c.inf & 0x80)
193                         {
194                         unsigned long e;
195
196                         e=ERR_GET_REASON(ERR_peek_error());
197                         if (e != ASN1_R_TOO_LONG)
198                                 goto err;
199                         else
200                                 ERR_get_error(); /* clear error */
201                         }
202                 i=c.p-p;/* header length */
203                 off+=i; /* end of data */
204
205                 if (c.inf & 1)
206                         {
207                         /* no data body so go round again */
208                         eos++;
209                         want=HEADER_SIZE;
210                         }
211                 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
212                         {
213                         /* eos value, so go back and read another header */
214                         eos--;
215                         if (eos <= 0)
216                                 break;
217                         else
218                                 want=HEADER_SIZE;
219                         }
220                 else 
221                         {
222                         /* suck in c.slen bytes of data */
223                         want=(int)c.slen;
224                         if (want > (len-off))
225                                 {
226                                 want-=(len-off);
227                                 if (!BUF_MEM_grow_clean(b,len+want))
228                                         {
229                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
230                                         goto err;
231                                         }
232                                 while (want > 0)
233                                         {
234                                         i=BIO_read(in,&(b->data[len]),want);
235                                         if (i <= 0)
236                                                 {
237                                                 ASN1err(ASN1_F_ASN1_D2I_BIO,
238                                                     ASN1_R_NOT_ENOUGH_DATA);
239                                                 goto err;
240                                                 }
241                                         len+=i;
242                                         want -= i;
243                                         }
244                                 }
245                         off+=(int)c.slen;
246                         if (eos <= 0)
247                                 {
248                                 break;
249                                 }
250                         else
251                                 want=HEADER_SIZE;
252                         }
253                 }
254
255         *pb = b;
256         return off;
257 err:
258         if (b != NULL) BUF_MEM_free(b);
259         return(ret);
260         }