sl@0: /* crypto/buffer/buffer.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/buffer.h>
sl@0: 
sl@0: EXPORT_C BUF_MEM *BUF_MEM_new(void)
sl@0: 	{
sl@0: 	BUF_MEM *ret;
sl@0: 
sl@0: 	ret=OPENSSL_malloc(sizeof(BUF_MEM));
sl@0: 	if (ret == NULL)
sl@0: 		{
sl@0: 		BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);
sl@0: 		return(NULL);
sl@0: 		}
sl@0: 	ret->length=0;
sl@0: 	ret->max=0;
sl@0: 	ret->data=NULL;
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void BUF_MEM_free(BUF_MEM *a)
sl@0: 	{
sl@0: 	if(a == NULL)
sl@0: 	    return;
sl@0: 
sl@0: 	if (a->data != NULL)
sl@0: 		{
sl@0: 		memset(a->data,0,(unsigned int)a->max);
sl@0: 		OPENSSL_free(a->data);
sl@0: 		}
sl@0: 	OPENSSL_free(a);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BUF_MEM_grow(BUF_MEM *str, int len)
sl@0: 	{
sl@0: 	char *ret;
sl@0: 	unsigned int n;
sl@0: 
sl@0: 	if (str->length >= len)
sl@0: 		{
sl@0: 		str->length=len;
sl@0: 		return(len);
sl@0: 		}
sl@0: 	if (str->max >= len)
sl@0: 		{
sl@0: 		memset(&str->data[str->length],0,len-str->length);
sl@0: 		str->length=len;
sl@0: 		return(len);
sl@0: 		}
sl@0: 	n=(len+3)/3*4;
sl@0: 	if (str->data == NULL)
sl@0: 		ret=OPENSSL_malloc(n);
sl@0: 	else
sl@0: 		ret=OPENSSL_realloc(str->data,n);
sl@0: 	if (ret == NULL)
sl@0: 		{
sl@0: 		BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
sl@0: 		len=0;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		str->data=ret;
sl@0: 		str->max=n;
sl@0: 		memset(&str->data[str->length],0,len-str->length);
sl@0: 		str->length=len;
sl@0: 		}
sl@0: 	return(len);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BUF_MEM_grow_clean(BUF_MEM *str, int len)
sl@0: 	{
sl@0: 	char *ret;
sl@0: 	unsigned int n;
sl@0: 
sl@0: 	if (str->length >= len)
sl@0: 		{
sl@0: 		memset(&str->data[len],0,str->length-len);
sl@0: 		str->length=len;
sl@0: 		return(len);
sl@0: 		}
sl@0: 	if (str->max >= len)
sl@0: 		{
sl@0: 		memset(&str->data[str->length],0,len-str->length);
sl@0: 		str->length=len;
sl@0: 		return(len);
sl@0: 		}
sl@0: 	n=(len+3)/3*4;
sl@0: 	if (str->data == NULL)
sl@0: 		ret=OPENSSL_malloc(n);
sl@0: 	else
sl@0: 		ret=OPENSSL_realloc_clean(str->data,str->max,n);
sl@0: 	if (ret == NULL)
sl@0: 		{
sl@0: 		BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
sl@0: 		len=0;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		str->data=ret;
sl@0: 		str->max=n;
sl@0: 		memset(&str->data[str->length],0,len-str->length);
sl@0: 		str->length=len;
sl@0: 		}
sl@0: 	return(len);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C char *BUF_strdup(const char *str)
sl@0: 	{
sl@0: 	if (str == NULL) return(NULL);
sl@0: 	return BUF_strndup(str, strlen(str));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C char *BUF_strndup(const char *str, size_t siz)
sl@0: 	{
sl@0: 	char *ret;
sl@0: 
sl@0: 	if (str == NULL) return(NULL);
sl@0: 
sl@0: 	ret=OPENSSL_malloc(siz+1);
sl@0: 	if (ret == NULL) 
sl@0: 		{
sl@0: 		BUFerr(BUF_F_BUF_STRNDUP,ERR_R_MALLOC_FAILURE);
sl@0: 		return(NULL);
sl@0: 		}
sl@0: 	BUF_strlcpy(ret,str,siz+1);
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void *BUF_memdup(const void *data, size_t siz)
sl@0: 	{
sl@0: 	void *ret;
sl@0: 
sl@0: 	if (data == NULL) return(NULL);
sl@0: 
sl@0: 	ret=OPENSSL_malloc(siz);
sl@0: 	if (ret == NULL) 
sl@0: 		{
sl@0: 		BUFerr(BUF_F_BUF_MEMDUP,ERR_R_MALLOC_FAILURE);
sl@0: 		return(NULL);
sl@0: 		}
sl@0: 	return memcpy(ret, data, siz);
sl@0: 	}	
sl@0: 
sl@0: EXPORT_C size_t BUF_strlcpy(char *dst, const char *src, size_t size)
sl@0: 	{
sl@0: 	size_t l = 0;
sl@0: 	for(; size > 1 && *src; size--)
sl@0: 		{
sl@0: 		*dst++ = *src++;
sl@0: 		l++;
sl@0: 		}
sl@0: 	if (size)
sl@0: 		*dst = '\0';
sl@0: 	return l + strlen(src);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C size_t BUF_strlcat(char *dst, const char *src, size_t size)
sl@0: 	{
sl@0: 	size_t l = 0;
sl@0: 	for(; size > 0 && *dst; size--, dst++)
sl@0: 		l++;
sl@0: 	return l + BUF_strlcpy(dst, src, size);
sl@0: 	}