/* crypto/asn1/a_bitstr.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>

 EXPORT_C int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)

 { return M_ASN1_BIT_STRING_set(x, d, len); }

 EXPORT_C int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)

 	{

 	int ret,j,bits,len;

 	unsigned char *p,*d;

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

 	len=a->length;

 	if (len > 0)

 		{

 		if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)

 			{

 			bits=(int)a->flags&0x07;

 			}

 		else

 			{

 			for ( ; len > 0; len--)

 				{

 				if (a->data[len-1]) break;

 				}

 			j=a->data[len-1];

 			if      (j & 0x01) bits=0;

 			else if (j & 0x02) bits=1;

 			else if (j & 0x04) bits=2;

 			else if (j & 0x08) bits=3;

 			else if (j & 0x10) bits=4;

 			else if (j & 0x20) bits=5;

 			else if (j & 0x40) bits=6;

 			else if (j & 0x80) bits=7;

 			else bits=0; /* should not happen */

 			}

 		}

 	else

 		bits=0;

 	ret=1+len;

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

 	p= *pp;

 	*(p++)=(unsigned char)bits;

 	d=a->data;

 	memcpy(p,d,len);

 	p+=len;

 	if (len > 0) p[-1]&=(0xff<<bits);

 	*pp=p;

 	return(ret);

 	}

 EXPORT_C ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,

 	const unsigned char **pp, long len)

 	{

 	ASN1_BIT_STRING *ret=NULL;

 	const unsigned char *p;

 	unsigned char *s;

 	int i;

 	if (len < 1)

 		{

 		i=ASN1_R_STRING_TOO_SHORT;

 		goto err;

 		}

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

 		{

 		if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);

 		}

 	else

 		ret=(*a);

 	p= *pp;

 	i= *(p++);

 	/* We do this to preserve the settings.  If we modify

 	 * the settings, via the _set_bit function, we will recalculate

 	 * on output */

 	ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */

 	ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */

 	if (len-- > 1) /* using one because of the bits left byte */

 		{

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

 		if (s == NULL)

 			{

 			i=ERR_R_MALLOC_FAILURE;

 			goto err;

 			}

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

 		s[len-1]&=(0xff<<i);

 		p+=len;

 		}

 	else

 		s=NULL;

 	ret->length=(int)len;

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

 	ret->data=s;

 	ret->type=V_ASN1_BIT_STRING;

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

 	*pp=p;

 	return(ret);

 err:

 	ASN1err(ASN1_F_C2I_ASN1_BIT_STRING,i);

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

 		M_ASN1_BIT_STRING_free(ret);

 	return(NULL);

 	}

 /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>

  */

 EXPORT_C int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)

 	{

 	int w,v,iv;

 	unsigned char *c;

 	w=n/8;

 	v=1<<(7-(n&0x07));

 	iv= ~v;

 	if (!value) v=0;

 	if (a == NULL)

 		return 0;

 	a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */

 	if ((a->length < (w+1)) || (a->data == NULL))

 		{

 		if (!value) return(1); /* Don't need to set */

 		if (a->data == NULL)

 			c=(unsigned char *)OPENSSL_malloc(w+1);

 		else

 			c=(unsigned char *)OPENSSL_realloc_clean(a->data,

 								 a->length,

 								 w+1);

 		if (c == NULL)

 			{

 			ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT,ERR_R_MALLOC_FAILURE);

 			return 0;

 			}

   		if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length);

 		a->data=c;

 		a->length=w+1;

 	}

 	a->data[w]=((a->data[w])&iv)|v;

 	while ((a->length > 0) && (a->data[a->length-1] == 0))

 		a->length--;

 	return(1);

 	}

 EXPORT_C int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)

 	{

 	int w,v;

 	w=n/8;

 	v=1<<(7-(n&0x07));

 	if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))

 		return(0);

 	return((a->data[w]&v) != 0);

 	}