ssl/libcrypto/src/crypto/buffer/buffer.c
changeset 31 ce057bb09d0b
parent 0 e4d67989cc36
equal deleted inserted replaced
30:e20de85af2ee 31:ce057bb09d0b
       
     1 /* crypto/buffer/buffer.c */
       
     2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
       
     3  * All rights reserved.
       
     4  *
       
     5  * This package is an SSL implementation written
       
     6  * by Eric Young (eay@cryptsoft.com).
       
     7  * The implementation was written so as to conform with Netscapes SSL.
       
     8  * 
       
     9  * This library is free for commercial and non-commercial use as long as
       
    10  * the following conditions are aheared to.  The following conditions
       
    11  * apply to all code found in this distribution, be it the RC4, RSA,
       
    12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
       
    13  * included with this distribution is covered by the same copyright terms
       
    14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
       
    15  * 
       
    16  * Copyright remains Eric Young's, and as such any Copyright notices in
       
    17  * the code are not to be removed.
       
    18  * If this package is used in a product, Eric Young should be given attribution
       
    19  * as the author of the parts of the library used.
       
    20  * This can be in the form of a textual message at program startup or
       
    21  * in documentation (online or textual) provided with the package.
       
    22  * 
       
    23  * Redistribution and use in source and binary forms, with or without
       
    24  * modification, are permitted provided that the following conditions
       
    25  * are met:
       
    26  * 1. Redistributions of source code must retain the copyright
       
    27  *    notice, this list of conditions and the following disclaimer.
       
    28  * 2. Redistributions in binary form must reproduce the above copyright
       
    29  *    notice, this list of conditions and the following disclaimer in the
       
    30  *    documentation and/or other materials provided with the distribution.
       
    31  * 3. All advertising materials mentioning features or use of this software
       
    32  *    must display the following acknowledgement:
       
    33  *    "This product includes cryptographic software written by
       
    34  *     Eric Young (eay@cryptsoft.com)"
       
    35  *    The word 'cryptographic' can be left out if the rouines from the library
       
    36  *    being used are not cryptographic related :-).
       
    37  * 4. If you include any Windows specific code (or a derivative thereof) from 
       
    38  *    the apps directory (application code) you must include an acknowledgement:
       
    39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
       
    40  * 
       
    41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
       
    42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
       
    43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
       
    44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
       
    45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
       
    46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
       
    47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
       
    48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
       
    49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
       
    50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
       
    51  * SUCH DAMAGE.
       
    52  * 
       
    53  * The licence and distribution terms for any publically available version or
       
    54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
       
    55  * copied and put under another distribution licence
       
    56  * [including the GNU Public Licence.]
       
    57  */
       
    58 
       
    59 #include <stdio.h>
       
    60 #include "cryptlib.h"
       
    61 #include <openssl/buffer.h>
       
    62 
       
    63 EXPORT_C BUF_MEM *BUF_MEM_new(void)
       
    64 	{
       
    65 	BUF_MEM *ret;
       
    66 
       
    67 	ret=OPENSSL_malloc(sizeof(BUF_MEM));
       
    68 	if (ret == NULL)
       
    69 		{
       
    70 		BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);
       
    71 		return(NULL);
       
    72 		}
       
    73 	ret->length=0;
       
    74 	ret->max=0;
       
    75 	ret->data=NULL;
       
    76 	return(ret);
       
    77 	}
       
    78 
       
    79 EXPORT_C void BUF_MEM_free(BUF_MEM *a)
       
    80 	{
       
    81 	if(a == NULL)
       
    82 	    return;
       
    83 
       
    84 	if (a->data != NULL)
       
    85 		{
       
    86 		memset(a->data,0,(unsigned int)a->max);
       
    87 		OPENSSL_free(a->data);
       
    88 		}
       
    89 	OPENSSL_free(a);
       
    90 	}
       
    91 
       
    92 EXPORT_C int BUF_MEM_grow(BUF_MEM *str, int len)
       
    93 	{
       
    94 	char *ret;
       
    95 	unsigned int n;
       
    96 
       
    97 	if (str->length >= len)
       
    98 		{
       
    99 		str->length=len;
       
   100 		return(len);
       
   101 		}
       
   102 	if (str->max >= len)
       
   103 		{
       
   104 		memset(&str->data[str->length],0,len-str->length);
       
   105 		str->length=len;
       
   106 		return(len);
       
   107 		}
       
   108 	n=(len+3)/3*4;
       
   109 	if (str->data == NULL)
       
   110 		ret=OPENSSL_malloc(n);
       
   111 	else
       
   112 		ret=OPENSSL_realloc(str->data,n);
       
   113 	if (ret == NULL)
       
   114 		{
       
   115 		BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
       
   116 		len=0;
       
   117 		}
       
   118 	else
       
   119 		{
       
   120 		str->data=ret;
       
   121 		str->max=n;
       
   122 		memset(&str->data[str->length],0,len-str->length);
       
   123 		str->length=len;
       
   124 		}
       
   125 	return(len);
       
   126 	}
       
   127 
       
   128 EXPORT_C int BUF_MEM_grow_clean(BUF_MEM *str, int len)
       
   129 	{
       
   130 	char *ret;
       
   131 	unsigned int n;
       
   132 
       
   133 	if (str->length >= len)
       
   134 		{
       
   135 		memset(&str->data[len],0,str->length-len);
       
   136 		str->length=len;
       
   137 		return(len);
       
   138 		}
       
   139 	if (str->max >= len)
       
   140 		{
       
   141 		memset(&str->data[str->length],0,len-str->length);
       
   142 		str->length=len;
       
   143 		return(len);
       
   144 		}
       
   145 	n=(len+3)/3*4;
       
   146 	if (str->data == NULL)
       
   147 		ret=OPENSSL_malloc(n);
       
   148 	else
       
   149 		ret=OPENSSL_realloc_clean(str->data,str->max,n);
       
   150 	if (ret == NULL)
       
   151 		{
       
   152 		BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
       
   153 		len=0;
       
   154 		}
       
   155 	else
       
   156 		{
       
   157 		str->data=ret;
       
   158 		str->max=n;
       
   159 		memset(&str->data[str->length],0,len-str->length);
       
   160 		str->length=len;
       
   161 		}
       
   162 	return(len);
       
   163 	}
       
   164 
       
   165 EXPORT_C char *BUF_strdup(const char *str)
       
   166 	{
       
   167 	if (str == NULL) return(NULL);
       
   168 	return BUF_strndup(str, strlen(str));
       
   169 	}
       
   170 
       
   171 EXPORT_C char *BUF_strndup(const char *str, size_t siz)
       
   172 	{
       
   173 	char *ret;
       
   174 
       
   175 	if (str == NULL) return(NULL);
       
   176 
       
   177 	ret=OPENSSL_malloc(siz+1);
       
   178 	if (ret == NULL) 
       
   179 		{
       
   180 		BUFerr(BUF_F_BUF_STRNDUP,ERR_R_MALLOC_FAILURE);
       
   181 		return(NULL);
       
   182 		}
       
   183 	BUF_strlcpy(ret,str,siz+1);
       
   184 	return(ret);
       
   185 	}
       
   186 
       
   187 EXPORT_C void *BUF_memdup(const void *data, size_t siz)
       
   188 	{
       
   189 	void *ret;
       
   190 
       
   191 	if (data == NULL) return(NULL);
       
   192 
       
   193 	ret=OPENSSL_malloc(siz);
       
   194 	if (ret == NULL) 
       
   195 		{
       
   196 		BUFerr(BUF_F_BUF_MEMDUP,ERR_R_MALLOC_FAILURE);
       
   197 		return(NULL);
       
   198 		}
       
   199 	return memcpy(ret, data, siz);
       
   200 	}	
       
   201 
       
   202 EXPORT_C size_t BUF_strlcpy(char *dst, const char *src, size_t size)
       
   203 	{
       
   204 	size_t l = 0;
       
   205 	for(; size > 1 && *src; size--)
       
   206 		{
       
   207 		*dst++ = *src++;
       
   208 		l++;
       
   209 		}
       
   210 	if (size)
       
   211 		*dst = '\0';
       
   212 	return l + strlen(src);
       
   213 	}
       
   214 
       
   215 EXPORT_C size_t BUF_strlcat(char *dst, const char *src, size_t size)
       
   216 	{
       
   217 	size_t l = 0;
       
   218 	for(; size > 0 && *dst; size--, dst++)
       
   219 		l++;
       
   220 	return l + BUF_strlcpy(dst, src, size);
       
   221 	}