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 68BUF_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 84void 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 97int BUF_MEM_grow(BUF_MEM *str, int len) 98 { 99 char *ret; 100 unsigned int n; 101 102 if (len < 0) 103 { 104 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE); 105 return 0; 106 } 107 if (str->length >= len) 108 { 109 str->length=len; 110 return(len); 111 } 112 if (str->max >= len) 113 { 114 memset(&str->data[str->length],0,len-str->length); 115 str->length=len; 116 return(len); 117 } 118 /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ 119 if (len > LIMIT_BEFORE_EXPANSION) 120 { 121 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE); 122 return 0; 123 } 124 n=(len+3)/3*4; 125 if (str->data == NULL) 126 ret=OPENSSL_malloc(n); 127 else 128 ret=OPENSSL_realloc(str->data,n); 129 if (ret == NULL) 130 { 131 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE); 132 len=0; 133 } 134 else 135 { 136 str->data=ret; 137 str->max=n; 138 memset(&str->data[str->length],0,len-str->length); 139 str->length=len; 140 } 141 return(len); 142 } 143 144int BUF_MEM_grow_clean(BUF_MEM *str, int len) 145 { 146 char *ret; 147 unsigned int n; 148 149 if (len < 0) 150 { 151 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE); 152 return 0; 153 } 154 if (str->length >= len) 155 { 156 memset(&str->data[len],0,str->length-len); 157 str->length=len; 158 return(len); 159 } 160 if (str->max >= len) 161 { 162 memset(&str->data[str->length],0,len-str->length); 163 str->length=len; 164 return(len); 165 } 166 /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ 167 if (len > LIMIT_BEFORE_EXPANSION) 168 { 169 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE); 170 return 0; 171 } 172 n=(len+3)/3*4; 173 if (str->data == NULL) 174 ret=OPENSSL_malloc(n); 175 else 176 ret=OPENSSL_realloc_clean(str->data,str->max,n); 177 if (ret == NULL) 178 { 179 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE); 180 len=0; 181 } 182 else 183 { 184 str->data=ret; 185 str->max=n; 186 memset(&str->data[str->length],0,len-str->length); 187 str->length=len; 188 } 189 return(len); 190 } 191