release/src/router/openssl/crypto/buffer/buffer.c

   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 /* LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That
  64  * function is applied in several functions in this file and this limit ensures
  65  * that the result fits in an int. */
  66 #define LIMIT_BEFORE_EXPANSION 0x5ffffffc
  67
  68 BUF_MEM *BUF_MEM_new(void)
  69         {
  70         BUF_MEM *ret;
  71
  72         ret=OPENSSL_malloc(sizeof(BUF_MEM));
  73         if (ret == NULL)
  74                 {
  75                 BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);
  76                 return(NULL);
  77                 }
  78         ret->length=0;
  79         ret->max=0;
  80         ret->data=NULL;
  81         return(ret);
  82         }
  83
  84 void BUF_MEM_free(BUF_MEM *a)
  85         {
  86         if(a == NULL)
  87             return;
  88
  89         if (a->data != NULL)
  90                 {
  91                 memset(a->data,0,(unsigned int)a->max);
  92                 OPENSSL_free(a->data);
  93                 }
  94         OPENSSL_free(a);
  95         }
  96
  97 int BUF_MEM_grow(BUF_MEM *str, size_t len)
  98         {
  99         char *ret;
 100         size_t n;
 101
 102         if (str->length >= len)
 103                 {
 104                 str->length=len;
 105                 return(len);
 106                 }
 107         if (str->max >= len)
 108                 {
 109                 memset(&str->data[str->length],0,len-str->length);
 110                 str->length=len;
 111                 return(len);
 112                 }
 113         /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
 114         if (len > LIMIT_BEFORE_EXPANSION)
 115                 {
 116                 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
 117                 return 0;
 118                 }
 119         n=(len+3)/3*4;
 120         if (str->data == NULL)
 121                 ret=OPENSSL_malloc(n);
 122         else
 123                 ret=OPENSSL_realloc(str->data,n);
 124         if (ret == NULL)
 125                 {
 126                 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
 127                 len=0;
 128                 }
 129         else
 130                 {
 131                 str->data=ret;
 132                 str->max=n;
 133                 memset(&str->data[str->length],0,len-str->length);
 134                 str->length=len;
 135                 }
 136         return(len);
 137         }
 138
 139 int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
 140         {
 141         char *ret;
 142         size_t n;
 143
 144         if (str->length >= len)
 145                 {
 146                 memset(&str->data[len],0,str->length-len);
 147                 str->length=len;
 148                 return(len);
 149                 }
 150         if (str->max >= len)
 151                 {
 152                 memset(&str->data[str->length],0,len-str->length);
 153                 str->length=len;
 154                 return(len);
 155                 }
 156         /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
 157         if (len > LIMIT_BEFORE_EXPANSION)
 158                 {
 159                 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
 160                 return 0;
 161                 }
 162         n=(len+3)/3*4;
 163         if (str->data == NULL)
 164                 ret=OPENSSL_malloc(n);
 165         else
 166                 ret=OPENSSL_realloc_clean(str->data,str->max,n);
 167         if (ret == NULL)
 168                 {
 169                 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
 170                 len=0;
 171                 }
 172         else
 173                 {
 174                 str->data=ret;
 175                 str->max=n;
 176                 memset(&str->data[str->length],0,len-str->length);
 177                 str->length=len;
 178                 }
 179         return(len);
 180         }
 181
 182 void BUF_reverse(unsigned char *out, unsigned char *in, size_t size)
 183         {
 184         size_t i;
 185         if (in)
 186                 {
 187                 out += size - 1;
 188                 for (i = 0; i < size; i++)
 189                         *in++ = *out--;
 190                 }
 191         else
 192                 {
 193                 unsigned char *q;
 194                 char c;
 195                 q = out + size - 1;
 196                 for (i = 0; i < size/2; i++)
 197                         {
 198                         c = *q;
 199                         *q-- = *out;
 200                         *out++ = c;
 201                         }
 202                 }
 203         }