1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file streams.h
31 *
32 * @brief Utility functions for data streams.
33 *
34 * @author Mike Becker
35 * @author Olaf Wintermann
36 * @copyright 2-Clause BSD License
37 */
38
39 #ifndef UCX_STREAMS_H
40 #define UCX_STREAMS_H
41
42 #include "common.h"
43
44 #ifdef __cplusplus
45 extern "C" {
46 #endif
47
48 /**
49 * Reads data from a stream and writes it to another stream.
50 *
51 * @param src the source stream
52 * @param dest the destination stream
53 * @param rfnc the read function
54 * @param wfnc the write function
55 * @param buf a pointer to the copy buffer or @c NULL if a buffer
56 * shall be implicitly created on the heap
57 * @param bufsize the size of the copy buffer - if @p buf is @c NULL you can
58 * set this to zero to let the implementation decide
59 * @param n the maximum number of bytes that shall be copied.
60 * If this is larger than @p bufsize, the content is copied over multiple
61 * iterations.
62 * @return the total number of bytes copied
63 */
64 cx_attr_nonnull_arg(1, 2, 3, 4)
65 cx_attr_access_r(1)
66 cx_attr_access_w(2)
67 cx_attr_access_w(5)
68 cx_attr_export
69 size_t cx_stream_bncopy(
70 void *src,
71 void *dest,
72 cx_read_func rfnc,
73 cx_write_func wfnc,
74 char *buf,
75 size_t bufsize,
76 size_t n
77 );
78
79 /**
80 * Reads data from a stream and writes it to another stream.
81 *
82 * @param src (@c void*) the source stream
83 * @param dest (@c void*) the destination stream
84 * @param rfnc (@c cx_read_func) the read function
85 * @param wfnc (@c cx_write_func) the write function
86 * @param buf (@c char*) a pointer to the copy buffer or @c NULL if a buffer
87 * shall be implicitly created on the heap
88 * @param bufsize (@c size_t) the size of the copy buffer - if @p buf is
89 * @c NULL you can set this to zero to let the implementation decide
90 * @return total number of bytes copied
91 */
92 #define cx_stream_bcopy(src, dest, rfnc, wfnc, buf, bufsize) \
93 cx_stream_bncopy(src, dest, rfnc, wfnc, buf, bufsize, SIZE_MAX)
94
95 /**
96 * Reads data from a stream and writes it to another stream.
97 *
98 * The data is temporarily stored in a stack allocated buffer.
99 *
100 * @param src the source stream
101 * @param dest the destination stream
102 * @param rfnc the read function
103 * @param wfnc the write function
104 * @param n the maximum number of bytes that shall be copied.
105 * @return total number of bytes copied
106 */
107 cx_attr_nonnull
108 cx_attr_access_r(1)
109 cx_attr_access_w(2)
110 cx_attr_export
111 size_t cx_stream_ncopy(
112 void *src,
113 void *dest,
114 cx_read_func rfnc,
115 cx_write_func wfnc,
116 size_t n
117 );
118
119 /**
120 * Reads data from a stream and writes it to another stream.
121 *
122 * The data is temporarily stored in a stack allocated buffer.
123 *
124 * @param src (@c void*) the source stream
125 * @param dest (@c void*) the destination stream
126 * @param rfnc (@c cx_read_func) the read function
127 * @param wfnc (@c cx_write_func) the write function
128 * @return total number of bytes copied
129 */
130 #define cx_stream_copy(src, dest, rfnc, wfnc) \
131 cx_stream_ncopy(src, dest, rfnc, wfnc, SIZE_MAX)
132
133 #ifdef __cplusplus
134 }
135 #endif
136
137 #endif // UCX_STREAMS_H
138