crypto/buffer/buffer.c

   1 /* crypto/buffer/buffer.c */
   2 /* Copyright (C) 1995-1997 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 "buffer.h"
  62
  63 BUF_MEM *BUF_MEM_new()
  64         {
  65         BUF_MEM *ret;
  66
  67         ret=(BUF_MEM *)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 void BUF_MEM_free(a)
  80 BUF_MEM *a;
  81         {
  82         if (a->data != NULL)
  83                 {
  84                 memset(a->data,0,(unsigned int)a->max);
  85                 Free(a->data);
  86                 }
  87         Free(a);
  88         }
  89
  90 int BUF_MEM_grow(str, len)
  91 BUF_MEM *str;
  92 int len;
  93         {
  94         char *ret;
  95         unsigned int n;
  96
  97         if (str->length >= len) return(len);
  98         if (str->max >= len)
  99                 {
 100                 memset(&(str->data[str->length]),0,len-str->length);
 101                 str->length=len;
 102                 return(len);
 103                 }
 104         n=(len+3)/3*4;
 105         if (str->data == NULL)
 106                 ret=(char *)Malloc(n);
 107         else
 108                 ret=(char *)Realloc(str->data,n);
 109         if (ret == NULL)
 110                 {
 111                 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
 112                 len=0;
 113                 }
 114         else
 115                 {
 116                 str->data=ret;
 117                 str->length=len;
 118                 str->max=n;
 119                 }
 120         return(len);
 121         }
 122
 123 char *BUF_strdup(str)
 124 char *str;
 125         {
 126         char *ret;
 127         int n;
 128
 129         n=strlen(str);
 130         ret=Malloc(n+1);
 131         if (ret == NULL)
 132                 {
 133                 BUFerr(BUF_F_BUF_STRDUP,ERR_R_MALLOC_FAILURE);
 134                 return(NULL);
 135                 }
 136         memcpy(ret,str,n+1);
 137         return(ret);
 138         }
 139