/* 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);

	}