/* crypto/buffer/buffer.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>

 EXPORT_C BUF_MEM *BUF_MEM_new(void)

 	{

 	BUF_MEM *ret;

 	ret=OPENSSL_malloc(sizeof(BUF_MEM));

 	if (ret == NULL)

 		{

 		BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);

 		return(NULL);

 		}

 	ret->length=0;

 	ret->max=0;

 	ret->data=NULL;

 	return(ret);

 	}

 EXPORT_C void BUF_MEM_free(BUF_MEM *a)

 	{

 	if(a == NULL)

 	    return;

 	if (a->data != NULL)

 		{

 		memset(a->data,0,(unsigned int)a->max);

 		OPENSSL_free(a->data);

 		}

 	OPENSSL_free(a);

 	}

 EXPORT_C int BUF_MEM_grow(BUF_MEM *str, int len)

 	{

 	char *ret;

 	unsigned int n;

 	if (str->length >= len)

 		{

 		str->length=len;

 		return(len);

 		}

 	if (str->max >= len)

 		{

 		memset(&str->data[str->length],0,len-str->length);

 		str->length=len;

 		return(len);

 		}

 	n=(len+3)/3*4;

 	if (str->data == NULL)

 		ret=OPENSSL_malloc(n);

 	else

 		ret=OPENSSL_realloc(str->data,n);

 	if (ret == NULL)

 		{

 		BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);

 		len=0;

 		}

 	else

 		{

 		str->data=ret;

 		str->max=n;

 		memset(&str->data[str->length],0,len-str->length);

 		str->length=len;

 		}

 	return(len);

 	}

 EXPORT_C int BUF_MEM_grow_clean(BUF_MEM *str, int len)

 	{

 	char *ret;

 	unsigned int n;

 	if (str->length >= len)

 		{

 		memset(&str->data[len],0,str->length-len);

 		str->length=len;

 		return(len);

 		}

 	if (str->max >= len)

 		{

 		memset(&str->data[str->length],0,len-str->length);

 		str->length=len;

 		return(len);

 		}

 	n=(len+3)/3*4;

 	if (str->data == NULL)

 		ret=OPENSSL_malloc(n);

 	else

 		ret=OPENSSL_realloc_clean(str->data,str->max,n);

 	if (ret == NULL)

 		{

 		BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);

 		len=0;

 		}

 	else

 		{

 		str->data=ret;

 		str->max=n;

 		memset(&str->data[str->length],0,len-str->length);

 		str->length=len;

 		}

 	return(len);

 	}

 EXPORT_C char *BUF_strdup(const char *str)

 	{

 	if (str == NULL) return(NULL);

 	return BUF_strndup(str, strlen(str));

 	}

 EXPORT_C char *BUF_strndup(const char *str, size_t siz)

 	{

 	char *ret;

 	if (str == NULL) return(NULL);

 	ret=OPENSSL_malloc(siz+1);

 	if (ret == NULL) 

 		{

 		BUFerr(BUF_F_BUF_STRNDUP,ERR_R_MALLOC_FAILURE);

 		return(NULL);

 		}

 	BUF_strlcpy(ret,str,siz+1);

 	return(ret);

 	}

 EXPORT_C void *BUF_memdup(const void *data, size_t siz)

 	{

 	void *ret;

 	if (data == NULL) return(NULL);

 	ret=OPENSSL_malloc(siz);

 	if (ret == NULL) 

 		{

 		BUFerr(BUF_F_BUF_MEMDUP,ERR_R_MALLOC_FAILURE);

 		return(NULL);

 		}

 	return memcpy(ret, data, siz);

 	}	

 EXPORT_C size_t BUF_strlcpy(char *dst, const char *src, size_t size)

 	{

 	size_t l = 0;

 	for(; size > 1 && *src; size--)

 		{

 		*dst++ = *src++;

 		l++;

 		}

 	if (size)

 		*dst = '\0';

 	return l + strlen(src);

 	}

 EXPORT_C size_t BUF_strlcat(char *dst, const char *src, size_t size)

 	{

 	size_t l = 0;

 	for(; size > 0 && *dst; size--, dst++)

 		l++;

 	return l + BUF_strlcpy(dst, src, size);

 	}