OSX/libsecurity_apple_csp/open_ssl/buffer/buffer.c

   1 /*
   2  * Copyright (c) 2000-2001,2011-2012,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /* crypto/buffer/buffer.c */
  20 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  21  * All rights reserved.
  22  *
  23  * This package is an SSL implementation written
  24  * by Eric Young (eay@cryptsoft.com).
  25  * The implementation was written so as to conform with Netscapes SSL.
  26  *
  27  * This library is free for commercial and non-commercial use as long as
  28  * the following conditions are aheared to.  The following conditions
  29  * apply to all code found in this distribution, be it the RC4, RSA,
  30  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  31  * included with this distribution is covered by the same copyright terms
  32  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  33  *
  34  * Copyright remains Eric Young's, and as such any Copyright notices in
  35  * the code are not to be removed.
  36  * If this package is used in a product, Eric Young should be given attribution
  37  * as the author of the parts of the library used.
  38  * This can be in the form of a textual message at program startup or
  39  * in documentation (online or textual) provided with the package.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *    "This product includes cryptographic software written by
  52  *     Eric Young (eay@cryptsoft.com)"
  53  *    The word 'cryptographic' can be left out if the rouines from the library
  54  *    being used are not cryptographic related :-).
  55  * 4. If you include any Windows specific code (or a derivative thereof) from
  56  *    the apps directory (application code) you must include an acknowledgement:
  57  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  69  * SUCH DAMAGE.
  70  *
  71  * The licence and distribution terms for any publically available version or
  72  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  73  * copied and put under another distribution licence
  74  * [including the GNU Public Licence.]
  75  */
  76
  77 #include <stdio.h>
  78 #include "cryptlib.h"
  79 #include <openssl/buffer.h>
  80
  81 BUF_MEM *BUF_MEM_new(void)
  82         {
  83         BUF_MEM *ret;
  84
  85         ret=Malloc(sizeof(BUF_MEM));
  86         if (ret == NULL)
  87                 {
  88                 BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);
  89                 return(NULL);
  90                 }
  91         ret->length=0;
  92         ret->max=0;
  93         ret->data=NULL;
  94         return(ret);
  95         }
  96
  97 void BUF_MEM_free(BUF_MEM *a)
  98         {
  99         if(a == NULL)
 100             return;
 101
 102         if (a->data != NULL)
 103                 {
 104                 memset(a->data,0,(unsigned int)a->max);
 105                 Free(a->data);
 106                 }
 107         Free(a);
 108         }
 109
 110 int BUF_MEM_grow(BUF_MEM *str, int len)
 111         {
 112         char *ret;
 113         unsigned int n;
 114
 115         if (str->length >= len)
 116                 {
 117                 str->length=len;
 118                 return(len);
 119                 }
 120         if (str->max >= len)
 121                 {
 122                 memset(&str->data[str->length],0,len-str->length);
 123                 str->length=len;
 124                 return(len);
 125                 }
 126         n=(len+3)/3*4;
 127         if (str->data == NULL)
 128                 ret=Malloc(n);
 129         else
 130                 ret=Realloc(str->data,n);
 131         if (ret == NULL)
 132                 {
 133                 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
 134                 len=0;
 135                 }
 136         else
 137                 {
 138                 str->data=ret;
 139                 str->length=len;
 140                 str->max=n;
 141                 }
 142         return(len);
 143         }
 144
 145 char *BUF_strdup(const char *str)
 146         {
 147         char *ret;
 148         size_t n;
 149
 150         if (str == NULL) return(NULL);
 151
 152         n=strlen(str);
 153         ret=Malloc(n+1);
 154         if (ret == NULL)
 155                 {
 156                 BUFerr(BUF_F_BUF_STRDUP,ERR_R_MALLOC_FAILURE);
 157                 return(NULL);
 158                 }
 159         memcpy(ret,str,n+1);
 160         return(ret);
 161         }
 162