source: trunk/sys/libcrypto/buffer.c@ 1

Last change on this file since 1 was 1, checked in by alain, 9 years ago

First import
File size: 4.8 KB
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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 <openssl/cryptlib.h>
61#include <openssl/buffer.h>
62
63BUF_MEM *BUF_MEM_new(void)
64 {
65 BUF_MEM *ret;
66
67 ret=OPENSSL_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
79void BUF_MEM_free(BUF_MEM *a)
80 {
81 if(a == NULL)
82 return;
83
84 if (a->data != NULL)
85 {
86 memset(a->data,0,(unsigned int)a->max);
87 OPENSSL_free(a->data);
88 }
89 OPENSSL_free(a);
90 }
91
92int BUF_MEM_grow(BUF_MEM *str, 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=OPENSSL_malloc(n);
111 else
112 ret=OPENSSL_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->max=n;
122 memset(&str->data[str->length],0,len-str->length);
123 str->length=len;
124 }
125 return(len);
126 }
127
128int BUF_MEM_grow_clean(BUF_MEM *str, int len)
129 {
130 char *ret;
131 unsigned int n;
132
133 if (str->length >= len)
134 {
135 memset(&str->data[len],0,str->length-len);
136 str->length=len;
137 return(len);
138 }
139 if (str->max >= len)
140 {
141 memset(&str->data[str->length],0,len-str->length);
142 str->length=len;
143 return(len);
144 }
145 n=(len+3)/3*4;
146 if (str->data == NULL)
147 ret=OPENSSL_malloc(n);
148 else
149 ret=OPENSSL_realloc_clean(str->data,str->max,n);
150 if (ret == NULL)
151 {
152 BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
153 len=0;
154 }
155 else
156 {
157 str->data=ret;
158 str->max=n;
159 memset(&str->data[str->length],0,len-str->length);
160 str->length=len;
161 }
162 return(len);
163 }
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