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#ifndef OPENSSL_HEADER_BUFFER_H
58#define OPENSSL_HEADER_BUFFER_H
59
60#include <openssl/base.h>
61
62#if defined(__cplusplus)
63extern "C" {
64#endif
65
66
67// Memory and string functions, see also mem.h.
68
69
70// buf_mem_st (aka |BUF_MEM|) is a generic buffer object used by OpenSSL.
71struct buf_mem_st {
72 size_t length; // current number of bytes
73 char *data;
74 size_t max; // size of buffer
75};
76
77// BUF_MEM_new creates a new BUF_MEM which has no allocated data buffer.
78OPENSSL_EXPORT BUF_MEM *BUF_MEM_new(void);
79
80// BUF_MEM_free frees |buf->data| if needed and then frees |buf| itself.
81OPENSSL_EXPORT void BUF_MEM_free(BUF_MEM *buf);
82
83// BUF_MEM_reserve ensures |buf| has capacity |cap| and allocates memory if
84// needed. It returns one on success and zero on error.
85OPENSSL_EXPORT int BUF_MEM_reserve(BUF_MEM *buf, size_t cap);
86
87// BUF_MEM_grow ensures that |buf| has length |len| and allocates memory if
88// needed. If the length of |buf| increased, the new bytes are filled with
89// zeros. It returns the length of |buf|, or zero if there's an error.
90OPENSSL_EXPORT size_t BUF_MEM_grow(BUF_MEM *buf, size_t len);
91
92// BUF_MEM_grow_clean calls |BUF_MEM_grow|. BoringSSL always zeros memory
93// allocated memory on free.
94OPENSSL_EXPORT size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len);
95
96// BUF_MEM_append appends |in| to |buf|. It returns one on success and zero on
97// error.
98OPENSSL_EXPORT int BUF_MEM_append(BUF_MEM *buf, const void *in, size_t len);
99
100// BUF_strdup returns an allocated, duplicate of |str|.
101OPENSSL_EXPORT char *BUF_strdup(const char *str);
102
103// BUF_strnlen returns the number of characters in |str|, excluding the NUL
104// byte, but at most |max_len|. This function never reads more than |max_len|
105// bytes from |str|.
106OPENSSL_EXPORT size_t BUF_strnlen(const char *str, size_t max_len);
107
108// BUF_strndup returns an allocated, duplicate of |str|, which is, at most,
109// |size| bytes. The result is always NUL terminated.
110OPENSSL_EXPORT char *BUF_strndup(const char *str, size_t size);
111
112// BUF_memdup returns an allocated, duplicate of |size| bytes from |data|.
113OPENSSL_EXPORT void *BUF_memdup(const void *data, size_t size);
114
115// BUF_strlcpy acts like strlcpy(3).
116OPENSSL_EXPORT size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size);
117
118// BUF_strlcat acts like strlcat(3).
119OPENSSL_EXPORT size_t BUF_strlcat(char *dst, const char *src, size_t dst_size);
120
121
122#if defined(__cplusplus)
123} // extern C
124
125extern "C++" {
126
127BSSL_NAMESPACE_BEGIN
128
129BORINGSSL_MAKE_DELETER(BUF_MEM, BUF_MEM_free)
130
131BSSL_NAMESPACE_END
132
133} // extern C++
134
135#endif
136
137#endif // OPENSSL_HEADER_BUFFER_H
138