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d02b48c6 | 1 | /* crypto/buffer/buffer.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
ae5c8664 | 8 | * |
d02b48c6 RE |
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). | |
ae5c8664 | 15 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 22 | * |
d02b48c6 RE |
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 :-). | |
ae5c8664 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
ae5c8664 | 40 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 52 | * |
d02b48c6 RE |
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" | |
ec577822 | 61 | #include <openssl/buffer.h> |
d02b48c6 | 62 | |
ae5c8664 MC |
63 | /* |
64 | * LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That | |
65 | * function is applied in several functions in this file and this limit | |
66 | * ensures that the result fits in an int. | |
67 | */ | |
564a503b DSH |
68 | #define LIMIT_BEFORE_EXPANSION 0x5ffffffc |
69 | ||
6b691a5c | 70 | BUF_MEM *BUF_MEM_new(void) |
ae5c8664 MC |
71 | { |
72 | BUF_MEM *ret; | |
d02b48c6 | 73 | |
ae5c8664 MC |
74 | ret = OPENSSL_malloc(sizeof(BUF_MEM)); |
75 | if (ret == NULL) { | |
76 | BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE); | |
77 | return (NULL); | |
78 | } | |
79 | ret->length = 0; | |
80 | ret->max = 0; | |
81 | ret->data = NULL; | |
82 | return (ret); | |
83 | } | |
d02b48c6 | 84 | |
6b691a5c | 85 | void BUF_MEM_free(BUF_MEM *a) |
ae5c8664 MC |
86 | { |
87 | if (a == NULL) | |
88 | return; | |
e03ddfae | 89 | |
ae5c8664 MC |
90 | if (a->data != NULL) { |
91 | memset(a->data, 0, (unsigned int)a->max); | |
92 | OPENSSL_free(a->data); | |
93 | } | |
94 | OPENSSL_free(a); | |
95 | } | |
d02b48c6 | 96 | |
debf3801 | 97 | int BUF_MEM_grow(BUF_MEM *str, size_t len) |
ae5c8664 MC |
98 | { |
99 | char *ret; | |
100 | size_t n; | |
d02b48c6 | 101 | |
ae5c8664 MC |
102 | if (str->length >= len) { |
103 | str->length = len; | |
104 | return (len); | |
105 | } | |
106 | if (str->max >= len) { | |
107 | memset(&str->data[str->length], 0, len - str->length); | |
108 | str->length = len; | |
109 | return (len); | |
110 | } | |
111 | /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ | |
112 | if (len > LIMIT_BEFORE_EXPANSION) { | |
113 | BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE); | |
114 | return 0; | |
115 | } | |
116 | n = (len + 3) / 3 * 4; | |
117 | if (str->data == NULL) | |
118 | ret = OPENSSL_malloc(n); | |
119 | else | |
120 | ret = OPENSSL_realloc(str->data, n); | |
121 | if (ret == NULL) { | |
122 | BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE); | |
123 | len = 0; | |
124 | } else { | |
125 | str->data = ret; | |
126 | str->max = n; | |
127 | memset(&str->data[str->length], 0, len - str->length); | |
128 | str->length = len; | |
129 | } | |
130 | return (len); | |
131 | } | |
d02b48c6 | 132 | |
debf3801 | 133 | int BUF_MEM_grow_clean(BUF_MEM *str, size_t len) |
ae5c8664 MC |
134 | { |
135 | char *ret; | |
136 | size_t n; | |
54a656ef | 137 | |
ae5c8664 MC |
138 | if (str->length >= len) { |
139 | memset(&str->data[len], 0, str->length - len); | |
140 | str->length = len; | |
141 | return (len); | |
142 | } | |
143 | if (str->max >= len) { | |
144 | memset(&str->data[str->length], 0, len - str->length); | |
145 | str->length = len; | |
146 | return (len); | |
147 | } | |
148 | /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */ | |
149 | if (len > LIMIT_BEFORE_EXPANSION) { | |
150 | BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE); | |
151 | return 0; | |
152 | } | |
153 | n = (len + 3) / 3 * 4; | |
154 | if (str->data == NULL) | |
155 | ret = OPENSSL_malloc(n); | |
156 | else | |
157 | ret = OPENSSL_realloc_clean(str->data, str->max, n); | |
158 | if (ret == NULL) { | |
159 | BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE); | |
160 | len = 0; | |
161 | } else { | |
162 | str->data = ret; | |
163 | str->max = n; | |
164 | memset(&str->data[str->length], 0, len - str->length); | |
165 | str->length = len; | |
166 | } | |
167 | return (len); | |
168 | } | |
54a656ef | 169 | |
7a216dfe | 170 | void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size) |
ae5c8664 MC |
171 | { |
172 | size_t i; | |
173 | if (in) { | |
174 | out += size - 1; | |
175 | for (i = 0; i < size; i++) | |
176 | *out-- = *in++; | |
177 | } else { | |
178 | unsigned char *q; | |
179 | char c; | |
180 | q = out + size - 1; | |
181 | for (i = 0; i < size / 2; i++) { | |
182 | c = *q; | |
183 | *q-- = *out; | |
184 | *out++ = c; | |
185 | } | |
186 | } | |
187 | } |