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 } 204