/* crypto/asn1/a_d2i_fp.c */

 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

  * All rights reserved.

  *

  * This package is an SSL implementation written

  * by Eric Young (eay@cryptsoft.com).

  * The implementation was written so as to conform with Netscapes SSL.

  * 

  * This library is free for commercial and non-commercial use as long as

  * the following conditions are aheared to.  The following conditions

  * apply to all code found in this distribution, be it the RC4, RSA,

  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

  * included with this distribution is covered by the same copyright terms

  * except that the holder is Tim Hudson (tjh@cryptsoft.com).

  * 

  * Copyright remains Eric Young's, and as such any Copyright notices in

  * the code are not to be removed.

  * If this package is used in a product, Eric Young should be given attribution

  * as the author of the parts of the library used.

  * This can be in the form of a textual message at program startup or

  * in documentation (online or textual) provided with the package.

  * 

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  * 1. Redistributions of source code must retain the copyright

  *    notice, this list of conditions and the following disclaimer.

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in the

  *    documentation and/or other materials provided with the distribution.

  * 3. All advertising materials mentioning features or use of this software

  *    must display the following acknowledgement:

  *    "This product includes cryptographic software written by

  *     Eric Young (eay@cryptsoft.com)"

  *    The word 'cryptographic' can be left out if the rouines from the library

  *    being used are not cryptographic related :-).

  * 4. If you include any Windows specific code (or a derivative thereof) from 

  *    the apps directory (application code) you must include an acknowledgement:

  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

  * 

  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  * SUCH DAMAGE.

  * 

  * The licence and distribution terms for any publically available version or

  * derivative of this code cannot be changed.  i.e. this code cannot simply be

  * copied and put under another distribution licence

  * [including the GNU Public Licence.]

  */

 #include <stdio.h>

 #include "cryptlib.h"

 #include <openssl/buffer.h>

 #include <openssl/asn1_mac.h>

 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);

 #ifndef NO_OLD_ASN1

 #ifndef OPENSSL_NO_FP_API

 EXPORT_C void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x)

         {

         BIO *b;

         void *ret;

         if ((b=BIO_new(BIO_s_file())) == NULL)

 		{

 		ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);

                 return(NULL);

 		}

         BIO_set_fp(b,in,BIO_NOCLOSE);

         ret=ASN1_d2i_bio(xnew,d2i,b,x);

         BIO_free(b);

         return(ret);

         }

 #endif

 EXPORT_C void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x)

 	{

 	BUF_MEM *b = NULL;

 	const unsigned char *p;

 	void *ret=NULL;

 	int len;

 	len = asn1_d2i_read_bio(in, &b);

 	if(len < 0) goto err;

 	p=(unsigned char *)b->data;

 	ret=d2i(x,&p,len);

 err:

 	if (b != NULL) BUF_MEM_free(b);

 	return(ret);

 	}

 #endif

 EXPORT_C void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)

 	{

 	BUF_MEM *b = NULL;

 	const unsigned char *p;

 	void *ret=NULL;

 	int len;

 	len = asn1_d2i_read_bio(in, &b);

 	if(len < 0) goto err;

 	p=(const unsigned char *)b->data;

 	ret=ASN1_item_d2i(x,&p,len, it);

 err:

 	if (b != NULL) BUF_MEM_free(b);

 	return(ret);

 	}

 #ifndef OPENSSL_NO_FP_API

 EXPORT_C void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)

         {

         BIO *b;

         char *ret;

         if ((b=BIO_new(BIO_s_file())) == NULL)

 		{

 		ASN1err(ASN1_F_ASN1_ITEM_D2I_FP,ERR_R_BUF_LIB);

                 return(NULL);

 		}

         BIO_set_fp(b,in,BIO_NOCLOSE);

         ret=ASN1_item_d2i_bio(it,b,x);

         BIO_free(b);

         return(ret);

         }

 #endif

 #define HEADER_SIZE   8

 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)

 	{

 	BUF_MEM *b;

 	unsigned char *p;

 	int i;

 	int ret=-1;

 	ASN1_const_CTX c;

 	int want=HEADER_SIZE;

 	int eos=0;

 #if defined(__GNUC__) && defined(__ia64)

 	/* pathetic compiler bug in all known versions as of Nov. 2002 */

 	long off=0;

 #else

 	int off=0;

 #endif

 	int len=0;

 	b=BUF_MEM_new();

 	if (b == NULL)

 		{

 		ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);

 		return -1;

 		}

 	ERR_clear_error();

 	for (;;)

 		{

 		if (want >= (len-off))

 			{

 			want-=(len-off);

 			if (!BUF_MEM_grow_clean(b,len+want))

 				{

 				ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);

 				goto err;

 				}

 			i=BIO_read(in,&(b->data[len]),want);

 			if ((i < 0) && ((len-off) == 0))

 				{

 				ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_NOT_ENOUGH_DATA);

 				goto err;

 				}

 			if (i > 0)

 				len+=i;

 			}

 		/* else data already loaded */

 		p=(unsigned char *)&(b->data[off]);

 		c.p=p;

 		c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),

 			len-off);

 		if (c.inf & 0x80)

 			{

 			unsigned long e;

 			e=ERR_GET_REASON(ERR_peek_error());

 			if (e != ASN1_R_TOO_LONG)

 				goto err;

 			else

 				ERR_clear_error(); /* clear error */

 			}

 		i=c.p-p;/* header length */

 		off+=i;	/* end of data */

 		if (c.inf & 1)

 			{

 			/* no data body so go round again */

 			eos++;

 			want=HEADER_SIZE;

 			}

 		else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))

 			{

 			/* eos value, so go back and read another header */

 			eos--;

 			if (eos <= 0)

 				break;

 			else

 				want=HEADER_SIZE;

 			}

 		else 

 			{

 			/* suck in c.slen bytes of data */

 			want=(int)c.slen;

 			if (want > (len-off))

 				{

 				want-=(len-off);

 				if (!BUF_MEM_grow_clean(b,len+want))

 					{

 					ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);

 					goto err;

 					}

 				while (want > 0)

 					{

 					i=BIO_read(in,&(b->data[len]),want);

 					if (i <= 0)

 						{

 						ASN1err(ASN1_F_ASN1_D2I_READ_BIO,

 						    ASN1_R_NOT_ENOUGH_DATA);

 						goto err;

 						}

 					len+=i;

 					want -= i;

 					}

 				}

 			off+=(int)c.slen;

 			if (eos <= 0)

 				{

 				break;

 				}

 			else

 				want=HEADER_SIZE;

 			}

 		}

 	*pb = b;

 	return off;

 err:

 	if (b != NULL) BUF_MEM_free(b);

 	return(ret);

 	}