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 "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) 98 { 99 str->length=len; 100 return(len); 101 } 102 if (str->max >= len) 103 { 104 memset(&(str->data[str->length]),0,len-str->length); 105 str->length=len; 106 return(len); 107 } 108 n=(len+3)/3*4; 109 if (str->data == NULL) 110 ret=(char *)Malloc(n); 111 else 112 ret=(char *)Realloc(str->data,n); 113 if (ret == NULL) 114 { 115 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE); 116 len=0; 117 } 118 else 119 { 120 str->data=ret; 121 str->length=len; 122 str->max=n; 123 } 124 return(len); 125 } 126 127 char *BUF_strdup(str) 128 char *str; 129 { 130 char *ret; 131 int n; 132 133 if (str == NULL) return(NULL); 134 135 n=strlen(str); 136 ret=Malloc(n+1); 137 if (ret == NULL) 138 { 139 BUFerr(BUF_F_BUF_STRDUP,ERR_R_MALLOC_FAILURE); 140 return(NULL); 141 } 142 memcpy(ret,str,n+1); 143 return(ret); 144 } 145 146