/* 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 <string.h>

#include <openssl/asn1.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/obj.h>
#include <openssl/stack.h>
#include <openssl/x509.h>


int X509_NAME_get_text_by_NID(X509_NAME *name, int nid, char *buf, int len)
	{
	const ASN1_OBJECT *obj;

	obj=OBJ_nid2obj(nid);
	if (obj == NULL) return(-1);
	return(X509_NAME_get_text_by_OBJ(name,obj,buf,len));
	}

int X509_NAME_get_text_by_OBJ(X509_NAME *name, const ASN1_OBJECT *obj, char *buf,
	     int len)
	{
	int i;
	ASN1_STRING *data;

	i=X509_NAME_get_index_by_OBJ(name,obj,-1);
	if (i < 0) return(-1);
	data=X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name,i));
	i=(data->length > (len-1))?(len-1):data->length;
	if (buf == NULL) return(data->length);
	memcpy(buf,data->data,i);
	buf[i]='\0';
	return(i);
	}

int X509_NAME_entry_count(X509_NAME *name)
	{
	if (name == NULL) return(0);
	return(sk_X509_NAME_ENTRY_num(name->entries));
	}

int X509_NAME_get_index_by_NID(X509_NAME *name, int nid, int lastpos)
	{
	const ASN1_OBJECT *obj;

	obj=OBJ_nid2obj(nid);
	if (obj == NULL) return(-2);
	return(X509_NAME_get_index_by_OBJ(name,obj,lastpos));
	}

/* NOTE: you should be passsing -1, not 0 as lastpos */
int X509_NAME_get_index_by_OBJ(X509_NAME *name, const ASN1_OBJECT *obj,
	     int lastpos)
	{
	int n;
	X509_NAME_ENTRY *ne;
	STACK_OF(X509_NAME_ENTRY) *sk;

	if (name == NULL) return(-1);
	if (lastpos < 0)
		lastpos= -1;
	sk=name->entries;
	n=sk_X509_NAME_ENTRY_num(sk);
	for (lastpos++; lastpos < n; lastpos++)
		{
		ne=sk_X509_NAME_ENTRY_value(sk,lastpos);
		if (OBJ_cmp(ne->object,obj) == 0)
			return(lastpos);
		}
	return(-1);
	}

X509_NAME_ENTRY *X509_NAME_get_entry(X509_NAME *name, int loc)
	{
	if(name == NULL || loc < 0 || sk_X509_NAME_ENTRY_num(name->entries) <= (size_t) loc)
		return(NULL);
	else
		return(sk_X509_NAME_ENTRY_value(name->entries,loc));
	}

X509_NAME_ENTRY *X509_NAME_delete_entry(X509_NAME *name, int loc)
	{
	X509_NAME_ENTRY *ret;
	int i,n,set_prev,set_next;
	STACK_OF(X509_NAME_ENTRY) *sk;

	if (name == NULL || loc < 0 || sk_X509_NAME_ENTRY_num(name->entries) <= (size_t) loc)
		return(NULL);
	sk=name->entries;
	ret=sk_X509_NAME_ENTRY_delete(sk,loc);
	n=sk_X509_NAME_ENTRY_num(sk);
	name->modified=1;
	if (loc == n) return(ret);

	/* else we need to fixup the set field */
	if (loc != 0)
		set_prev=(sk_X509_NAME_ENTRY_value(sk,loc-1))->set;
	else
		set_prev=ret->set-1;
	set_next=sk_X509_NAME_ENTRY_value(sk,loc)->set;

	/* set_prev is the previous set
	 * set is the current set
	 * set_next is the following
	 * prev  1 1	1 1	1 1	1 1
	 * set   1	1	2	2
	 * next  1 1	2 2	2 2	3 2
	 * so basically only if prev and next differ by 2, then
	 * re-number down by 1 */
	if (set_prev+1 < set_next)
		for (i=loc; i<n; i++)
			sk_X509_NAME_ENTRY_value(sk,i)->set--;
	return(ret);
	}

int X509_NAME_add_entry_by_OBJ(X509_NAME *name, ASN1_OBJECT *obj, int type,
			unsigned char *bytes, int len, int loc, int set)
{
	X509_NAME_ENTRY *ne;
	int ret;
	ne = X509_NAME_ENTRY_create_by_OBJ(NULL, obj, type, bytes, len);
	if(!ne) return 0;
	ret = X509_NAME_add_entry(name, ne, loc, set);
	X509_NAME_ENTRY_free(ne);
	return ret;
}

int X509_NAME_add_entry_by_NID(X509_NAME *name, int nid, int type,
			unsigned char *bytes, int len, int loc, int set)
{
	X509_NAME_ENTRY *ne;
	int ret;
	ne = X509_NAME_ENTRY_create_by_NID(NULL, nid, type, bytes, len);
	if(!ne) return 0;
	ret = X509_NAME_add_entry(name, ne, loc, set);
	X509_NAME_ENTRY_free(ne);
	return ret;
}

int X509_NAME_add_entry_by_txt(X509_NAME *name, const char *field, int type,
			const unsigned char *bytes, int len, int loc, int set)
{
	X509_NAME_ENTRY *ne;
	int ret;
	ne = X509_NAME_ENTRY_create_by_txt(NULL, field, type, bytes, len);
	if(!ne) return 0;
	ret = X509_NAME_add_entry(name, ne, loc, set);
	X509_NAME_ENTRY_free(ne);
	return ret;
}

/* if set is -1, append to previous set, 0 'a new one', and 1,
 * prepend to the guy we are about to stomp on. */
int X509_NAME_add_entry(X509_NAME *name, X509_NAME_ENTRY *ne, int loc,
	     int set)
	{
	X509_NAME_ENTRY *new_name=NULL;
	int n,i,inc;
	STACK_OF(X509_NAME_ENTRY) *sk;

	if (name == NULL) return(0);
	sk=name->entries;
	n=sk_X509_NAME_ENTRY_num(sk);
	if (loc > n) loc=n;
	else if (loc < 0) loc=n;

	name->modified=1;

	if (set == -1)
		{
		if (loc == 0)
			{
			set=0;
			inc=1;
			}
		else
			{
			set=sk_X509_NAME_ENTRY_value(sk,loc-1)->set;
			inc=0;
			}
		}
	else /* if (set >= 0) */
		{
		if (loc >= n)
			{
			if (loc != 0)
				set=sk_X509_NAME_ENTRY_value(sk,loc-1)->set+1;
			else
				set=0;
			}
		else
			set=sk_X509_NAME_ENTRY_value(sk,loc)->set;
		inc=(set == 0)?1:0;
		}

	if ((new_name=X509_NAME_ENTRY_dup(ne)) == NULL)
		goto err;
	new_name->set=set;
	if (!sk_X509_NAME_ENTRY_insert(sk,new_name,loc))
		{
		OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
		goto err;
		}
	if (inc)
		{
		n=sk_X509_NAME_ENTRY_num(sk);
		for (i=loc+1; i<n; i++)
			sk_X509_NAME_ENTRY_value(sk,i-1)->set+=1;
		}	
	return(1);
err:
	if (new_name != NULL)
		X509_NAME_ENTRY_free(new_name);
	return(0);
	}

X509_NAME_ENTRY *X509_NAME_ENTRY_create_by_txt(X509_NAME_ENTRY **ne,
		const char *field, int type, const unsigned char *bytes, int len)
	{
	ASN1_OBJECT *obj;
	X509_NAME_ENTRY *nentry;

	obj=OBJ_txt2obj(field, 0);
	if (obj == NULL)
		{
		OPENSSL_PUT_ERROR(X509, X509_R_INVALID_FIELD_NAME);
		ERR_add_error_data(2, "name=", field);
		return(NULL);
		}
	nentry = X509_NAME_ENTRY_create_by_OBJ(ne,obj,type,bytes,len);
	ASN1_OBJECT_free(obj);
	return nentry;
	}

X509_NAME_ENTRY *X509_NAME_ENTRY_create_by_NID(X509_NAME_ENTRY **ne, int nid,
	     int type, unsigned char *bytes, int len)
	{
	const ASN1_OBJECT *obj = OBJ_nid2obj(nid);
	if (obj == NULL)
		{
		OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_NID);
		return NULL;
		}
	return X509_NAME_ENTRY_create_by_OBJ(ne,obj,type,bytes,len);
	}

X509_NAME_ENTRY *X509_NAME_ENTRY_create_by_OBJ(X509_NAME_ENTRY **ne,
	     const ASN1_OBJECT *obj, int type, const unsigned char *bytes, int len)
	{
	X509_NAME_ENTRY *ret;

	if ((ne == NULL) || (*ne == NULL))
		{
		if ((ret=X509_NAME_ENTRY_new()) == NULL)
			return(NULL);
		}
	else
		ret= *ne;

	if (!X509_NAME_ENTRY_set_object(ret,obj))
		goto err;
	if (!X509_NAME_ENTRY_set_data(ret,type,bytes,len))
		goto err;

	if ((ne != NULL) && (*ne == NULL)) *ne=ret;
	return(ret);
err:
	if ((ne == NULL) || (ret != *ne))
		X509_NAME_ENTRY_free(ret);
	return(NULL);
	}

int X509_NAME_ENTRY_set_object(X509_NAME_ENTRY *ne, const ASN1_OBJECT *obj)
	{
	if ((ne == NULL) || (obj == NULL))
		{
		OPENSSL_PUT_ERROR(X509, ERR_R_PASSED_NULL_PARAMETER);
		return(0);
		}
	ASN1_OBJECT_free(ne->object);
	ne->object=OBJ_dup(obj);
	return((ne->object == NULL)?0:1);
	}

int X509_NAME_ENTRY_set_data(X509_NAME_ENTRY *ne, int type,
	     const unsigned char *bytes, int len)
	{
	int i;

	if ((ne == NULL) || ((bytes == NULL) && (len != 0))) return(0);
	if((type > 0) && (type & MBSTRING_FLAG)) 
		return ASN1_STRING_set_by_NID(&ne->value, bytes,
						len, type,
					OBJ_obj2nid(ne->object)) ? 1 : 0;
	if (len < 0) len=strlen((const char *)bytes);
	i=ASN1_STRING_set(ne->value,bytes,len);
	if (!i) return(0);
	if (type != V_ASN1_UNDEF)
		{
		if (type == V_ASN1_APP_CHOOSE)
			ne->value->type=ASN1_PRINTABLE_type(bytes,len);
		else
			ne->value->type=type;
		}
	return(1);
	}

ASN1_OBJECT *X509_NAME_ENTRY_get_object(X509_NAME_ENTRY *ne)
	{
	if (ne == NULL) return(NULL);
	return(ne->object);
	}

ASN1_STRING *X509_NAME_ENTRY_get_data(X509_NAME_ENTRY *ne)
	{
	if (ne == NULL) return(NULL);
	return(ne->value);
	}