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 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
73 return NULL;
74 }
75
76 OPENSSL_memset(ret, 0, sizeof(BUF_MEM));
77 return ret;
78 }
79
BUF_MEM_free(BUF_MEM * buf)80 void BUF_MEM_free(BUF_MEM *buf) {
81 if (buf == NULL) {
82 return;
83 }
84
85 OPENSSL_free(buf->data);
86 OPENSSL_free(buf);
87 }
88
BUF_MEM_reserve(BUF_MEM * buf,size_t cap)89 int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) {
90 if (buf->max >= cap) {
91 return 1;
92 }
93
94 size_t n = cap + 3;
95 if (n < cap) {
96 // overflow
97 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
98 return 0;
99 }
100 n = n / 3;
101 size_t alloc_size = n * 4;
102 if (alloc_size / 4 != n) {
103 // overflow
104 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
105 return 0;
106 }
107
108 char *new_buf = OPENSSL_realloc(buf->data, alloc_size);
109 if (new_buf == NULL) {
110 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
111 return 0;
112 }
113
114 buf->data = new_buf;
115 buf->max = alloc_size;
116 return 1;
117 }
118
BUF_MEM_grow(BUF_MEM * buf,size_t len)119 size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
120 if (!BUF_MEM_reserve(buf, len)) {
121 return 0;
122 }
123 if (buf->length < len) {
124 OPENSSL_memset(&buf->data[buf->length], 0, len - buf->length);
125 }
126 buf->length = len;
127 return len;
128 }
129
BUF_MEM_grow_clean(BUF_MEM * buf,size_t len)130 size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
131 return BUF_MEM_grow(buf, len);
132 }
133
BUF_MEM_append(BUF_MEM * buf,const void * in,size_t len)134 int BUF_MEM_append(BUF_MEM *buf, const void *in, size_t len) {
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) {
149 if (str == NULL) {
150 return NULL;
151 }
152
153 return BUF_strndup(str, strlen(str));
154 }
155
BUF_strnlen(const char * str,size_t max_len)156 size_t BUF_strnlen(const char *str, size_t max_len) {
157 size_t i;
158
159 for (i = 0; i < max_len; i++) {
160 if (str[i] == 0) {
161 break;
162 }
163 }
164
165 return i;
166 }
167
BUF_strndup(const char * str,size_t size)168 char *BUF_strndup(const char *str, size_t size) {
169 char *ret;
170 size_t alloc_size;
171
172 if (str == NULL) {
173 return NULL;
174 }
175
176 size = BUF_strnlen(str, size);
177
178 alloc_size = size + 1;
179 if (alloc_size < size) {
180 // overflow
181 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
182 return NULL;
183 }
184 ret = OPENSSL_malloc(alloc_size);
185 if (ret == NULL) {
186 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
187 return NULL;
188 }
189
190 OPENSSL_memcpy(ret, str, size);
191 ret[size] = '\0';
192 return ret;
193 }
194
BUF_strlcpy(char * dst,const char * src,size_t dst_size)195 size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
196 size_t l = 0;
197
198 for (; dst_size > 1 && *src; dst_size--) {
199 *dst++ = *src++;
200 l++;
201 }
202
203 if (dst_size) {
204 *dst = 0;
205 }
206
207 return l + strlen(src);
208 }
209
BUF_strlcat(char * dst,const char * src,size_t dst_size)210 size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
211 size_t l = 0;
212 for (; dst_size > 0 && *dst; dst_size--, dst++) {
213 l++;
214 }
215 return l + BUF_strlcpy(dst, src, dst_size);
216 }
217
BUF_memdup(const void * data,size_t size)218 void *BUF_memdup(const void *data, size_t size) {
219 if (size == 0) {
220 return NULL;
221 }
222
223 void *ret = OPENSSL_malloc(size);
224 if (ret == NULL) {
225 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
226 return NULL;
227 }
228
229 OPENSSL_memcpy(ret, data, size);
230 return ret;
231 }
232