/* crypto/asn1/a_bytes.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/asn1.h>

static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);

/* type is a 'bitmap' of acceptable string types.

 */

EXPORT_C ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,

	     long length, int type)

	{

	ASN1_STRING *ret=NULL;

	const unsigned char *p;

	unsigned char *s;

	long len;

	int inf,tag,xclass;

	int i=0;

	p= *pp;

	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);

	if (inf & 0x80) goto err;

	if (tag >= 32)

		{

		i=ASN1_R_TAG_VALUE_TOO_HIGH;;

		goto err;

		}

	if (!(ASN1_tag2bit(tag) & type))

		{

		i=ASN1_R_WRONG_TYPE;

		goto err;

		}

	/* If a bit-string, exit early */

	if (tag == V_ASN1_BIT_STRING)

		return(d2i_ASN1_BIT_STRING(a,pp,length));

	if ((a == NULL) || ((*a) == NULL))

		{

		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);

		}

	else

		ret=(*a);

	if (len != 0)

		{

		s=(unsigned char *)OPENSSL_malloc((int)len+1);

		if (s == NULL)

			{

			i=ERR_R_MALLOC_FAILURE;

			goto err;

			}

		memcpy(s,p,(int)len);

		s[len]='\0';

		p+=len;

		}

	else

		s=NULL;

	if (ret->data != NULL) OPENSSL_free(ret->data);

	ret->length=(int)len;

	ret->data=s;

	ret->type=tag;

	if (a != NULL) (*a)=ret;

	*pp=p;

	return(ret);

err:

	ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);

	if ((ret != NULL) && ((a == NULL) || (*a != ret)))

		ASN1_STRING_free(ret);

	return(NULL);

	}

EXPORT_C int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)

	{

	int ret,r,constructed;

	unsigned char *p;

	if (a == NULL)  return(0);

	if (tag == V_ASN1_BIT_STRING)

		return(i2d_ASN1_BIT_STRING(a,pp));

	ret=a->length;

	r=ASN1_object_size(0,ret,tag);

	if (pp == NULL) return(r);

	p= *pp;

	if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))

		constructed=1;

	else

		constructed=0;

	ASN1_put_object(&p,constructed,ret,tag,xclass);

	memcpy(p,a->data,a->length);

	p+=a->length;

	*pp= p;

	return(r);

	}

EXPORT_C ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,

	     long length, int Ptag, int Pclass)

	{

	ASN1_STRING *ret=NULL;

	const unsigned char *p;

	unsigned char *s;

	long len;

	int inf,tag,xclass;

	int i=0;

	if ((a == NULL) || ((*a) == NULL))

		{

		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);

		}

	else

		ret=(*a);

	p= *pp;

	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);

	if (inf & 0x80)

		{

		i=ASN1_R_BAD_OBJECT_HEADER;

		goto err;

		}

	if (tag != Ptag)

		{

		i=ASN1_R_WRONG_TAG;

		goto err;

		}

	if (inf & V_ASN1_CONSTRUCTED)

		{

		ASN1_const_CTX c;

		c.pp=pp;

		c.p=p;

		c.inf=inf;

		c.slen=len;

		c.tag=Ptag;

		c.xclass=Pclass;

		c.max=(length == 0)?0:(p+length);

		if (!asn1_collate_primitive(ret,&c)) 

			goto err; 

		else

			{

			p=c.p;

			}

		}

	else

		{

		if (len != 0)

			{

			if ((ret->length < len) || (ret->data == NULL))

				{

				if (ret->data != NULL) OPENSSL_free(ret->data);

				s=(unsigned char *)OPENSSL_malloc((int)len + 1);

				if (s == NULL)

					{

					i=ERR_R_MALLOC_FAILURE;

					goto err;

					}

				}

			else

				s=ret->data;

			memcpy(s,p,(int)len);

			s[len] = '\0';

			p+=len;

			}

		else

			{

			s=NULL;

			if (ret->data != NULL) OPENSSL_free(ret->data);

			}

		ret->length=(int)len;

		ret->data=s;

		ret->type=Ptag;

		}

	if (a != NULL) (*a)=ret;

	*pp=p;

	return(ret);

err:

	if ((ret != NULL) && ((a == NULL) || (*a != ret)))

		ASN1_STRING_free(ret);

	ASN1err(ASN1_F_D2I_ASN1_BYTES,i);

	return(NULL);

	}

/* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse

 * them into the one structure that is then returned */

/* There have been a few bug fixes for this function from

 * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */

static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)

	{

	ASN1_STRING *os=NULL;

	BUF_MEM b;

	int num;

	b.length=0;

	b.max=0;

	b.data=NULL;

	if (a == NULL)

		{

		c->error=ERR_R_PASSED_NULL_PARAMETER;

		goto err;

		}

	num=0;

	for (;;)

		{

		if (c->inf & 1)

			{

			c->eos=ASN1_const_check_infinite_end(&c->p,

				(long)(c->max-c->p));

			if (c->eos) break;

			}

		else

			{

			if (c->slen <= 0) break;

			}

		c->q=c->p;

		if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)

			== NULL)

			{

			c->error=ERR_R_ASN1_LIB;

			goto err;

			}

		if (!BUF_MEM_grow_clean(&b,num+os->length))

			{

			c->error=ERR_R_BUF_LIB;

			goto err;

			}

		memcpy(&(b.data[num]),os->data,os->length);

		if (!(c->inf & 1))

			c->slen-=(c->p-c->q);

		num+=os->length;

		}

	if (!asn1_const_Finish(c)) goto err;

	a->length=num;

	if (a->data != NULL) OPENSSL_free(a->data);

	a->data=(unsigned char *)b.data;

	if (os != NULL) ASN1_STRING_free(os);

	return(1);

err:

	ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);

	if (os != NULL) ASN1_STRING_free(os);

	if (b.data != NULL) OPENSSL_free(b.data);

	return(0);

	}