1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/buf.h>
58
59 #include <string.h>
60
61 #include <openssl/mem.h>
62 #include <openssl/err.h>
63
64 #include "../internal.h"
65
66
BUF_MEM_new(void)67 BUF_MEM *BUF_MEM_new(void) {
68 BUF_MEM *ret;
69
70 ret = OPENSSL_malloc(sizeof(BUF_MEM));
71 if (ret == NULL) {
72 return NULL;
73 }
74
75 OPENSSL_memset(ret, 0, sizeof(BUF_MEM));
76 return ret;
77 }
78
BUF_MEM_free(BUF_MEM * buf)79 void BUF_MEM_free(BUF_MEM *buf) {
80 if (buf == NULL) {
81 return;
82 }
83
84 OPENSSL_free(buf->data);
85 OPENSSL_free(buf);
86 }
87
BUF_MEM_reserve(BUF_MEM * buf,size_t cap)88 int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) {
89 if (buf->max >= cap) {
90 return 1;
91 }
92
93 size_t n = cap + 3;
94 if (n < cap) {
95 OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);
96 return 0;
97 }
98 n = n / 3;
99 size_t alloc_size = n * 4;
100 if (alloc_size / 4 != n) {
101 OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);
102 return 0;
103 }
104
105 char *new_buf = OPENSSL_realloc(buf->data, alloc_size);
106 if (new_buf == NULL) {
107 return 0;
108 }
109
110 buf->data = new_buf;
111 buf->max = alloc_size;
112 return 1;
113 }
114
BUF_MEM_grow(BUF_MEM * buf,size_t len)115 size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
116 if (!BUF_MEM_reserve(buf, len)) {
117 return 0;
118 }
119 if (buf->length < len) {
120 OPENSSL_memset(&buf->data[buf->length], 0, len - buf->length);
121 }
122 buf->length = len;
123 return len;
124 }
125
BUF_MEM_grow_clean(BUF_MEM * buf,size_t len)126 size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
127 return BUF_MEM_grow(buf, len);
128 }
129
BUF_MEM_append(BUF_MEM * buf,const void * in,size_t len)130 int BUF_MEM_append(BUF_MEM *buf, const void *in, size_t len) {
131 // Work around a C language bug. See https://crbug.com/1019588.
132 if (len == 0) {
133 return 1;
134 }
135 size_t new_len = buf->length + len;
136 if (new_len < len) {
137 OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);
138 return 0;
139 }
140 if (!BUF_MEM_reserve(buf, new_len)) {
141 return 0;
142 }
143 OPENSSL_memcpy(buf->data + buf->length, in, len);
144 buf->length = new_len;
145 return 1;
146 }
147
BUF_strdup(const char * str)148 char *BUF_strdup(const char *str) { return OPENSSL_strdup(str); }
149
BUF_strnlen(const char * str,size_t max_len)150 size_t BUF_strnlen(const char *str, size_t max_len) {
151 return OPENSSL_strnlen(str, max_len);
152 }
153
BUF_strndup(const char * str,size_t size)154 char *BUF_strndup(const char *str, size_t size) {
155 return OPENSSL_strndup(str, size);
156 }
157
BUF_strlcpy(char * dst,const char * src,size_t dst_size)158 size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
159 return OPENSSL_strlcpy(dst, src, dst_size);
160 }
161
BUF_strlcat(char * dst,const char * src,size_t dst_size)162 size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
163 return OPENSSL_strlcat(dst, src, dst_size);
164 }
165
BUF_memdup(const void * data,size_t size)166 void *BUF_memdup(const void *data, size_t size) {
167 return OPENSSL_memdup(data, size);
168 }
169