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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 "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 } | |
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