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