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 "buffer.h"
  62 #include "asn1_mac.h"
  63
  64 #define HEADER_SIZE   8
  65
  66 #ifndef NO_FP_API
  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         ERR_clear_error();
 112         for (;;)
 113                 {
 114                 if (want >= (len-off))
 115                         {
 116                         want-=(len-off);
 117
 118                         if (!BUF_MEM_grow(b,len+want))
 119                                 {
 120                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 121                                 goto err;
 122                                 }
 123                         i=BIO_read(in,&(b->data[len]),want);
 124                         if ((i < 0) && ((len-off) == 0))
 125                                 {
 126                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
 127                                 goto err;
 128                                 }
 129                         if (i > 0)
 130                                 len+=i;
 131                         }
 132                 /* else data already loaded */
 133
 134                 p=(unsigned char *)&(b->data[off]);
 135                 c.p=p;
 136                 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
 137                         len-off);
 138                 if (c.inf & 0x80)
 139                         {
 140                         unsigned long e;
 141
 142                         e=ERR_GET_REASON(ERR_peek_error());
 143                         if (e != ASN1_R_TOO_LONG)
 144                                 goto err;
 145                         else
 146                                 ERR_get_error(); /* clear error */
 147                         }
 148                 i=c.p-p;/* header length */
 149                 off+=i; /* end of data */
 150
 151                 if (c.inf & 1)
 152                         {
 153                         /* no data body so go round again */
 154                         eos++;
 155                         want=HEADER_SIZE;
 156                         }
 157                 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
 158                         {
 159                         /* eos value, so go back and read another header */
 160                         eos--;
 161                         if (eos <= 0)
 162                                 break;
 163                         else
 164                                 want=HEADER_SIZE;
 165                         }
 166                 else
 167                         {
 168                         /* suck in c.slen bytes of data */
 169                         want=(int)c.slen;
 170                         if (want > (len-off))
 171                                 {
 172                                 want-=(len-off);
 173                                 if (!BUF_MEM_grow(b,len+want))
 174                                         {
 175                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 176                                         goto err;
 177                                         }
 178                                 i=BIO_read(in,&(b->data[len]),want);
 179                                 if (i <= 0)
 180                                         {
 181                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
 182                                         goto err;
 183                                         }
 184                                 len+=i;
 185                                 }
 186                         off+=(int)c.slen;
 187                         if (eos <= 0)
 188                                 {
 189                                 break;
 190                                 }
 191                         else
 192                                 want=HEADER_SIZE;
 193                         }
 194                 }
 195
 196         p=(unsigned char *)b->data;
 197         ret=d2i(x,&p,off);
 198 err:
 199         if (b != NULL) BUF_MEM_free(b);
 200         return(ret);
 201         }