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 #include "cx/streams.h"
30
31 #ifndef CX_STREAM_BCOPY_BUF_SIZE
32 #define CX_STREAM_BCOPY_BUF_SIZE 8192
33 #endif
34
35 #ifndef CX_STREAM_COPY_BUF_SIZE
36 #define CX_STREAM_COPY_BUF_SIZE 1024
37 #endif
38
39 size_t cx_stream_bncopy(
40 void *src,
41 void *dest,
42 cx_read_func rfnc,
43 cx_write_func wfnc,
44 char *buf,
45 size_t bufsize,
46 size_t n
47 ) {
48 if (n == 0) {
49 return 0;
50 }
51
52 char *lbuf;
53 size_t ncp = 0;
54
55 if (buf) {
56 if (bufsize == 0) return 0;
57 lbuf = buf;
58 } else {
59 if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE;
60 lbuf = malloc(bufsize);
61 if (lbuf == NULL) return 0;
62 }
63
64 size_t r;
65 size_t rn = bufsize > n ? n : bufsize;
66 while ((r = rfnc(lbuf, 1, rn, src)) != 0) {
67 r = wfnc(lbuf, 1, r, dest);
68 ncp += r;
69 n -= r;
70 rn = bufsize > n ? n : bufsize;
71 if (r == 0 || n == 0) {
72 break;
73 }
74 }
75
76 if (lbuf != buf) {
77 free(lbuf);
78 }
79
80 return ncp;
81 }
82
83 size_t cx_stream_ncopy(
84 void *src,
85 void *dest,
86 cx_read_func rfnc,
87 cx_write_func wfnc,
88 size_t n
89 ) {
90 char buf[CX_STREAM_COPY_BUF_SIZE];
91 return cx_stream_bncopy(src, dest, rfnc, wfnc,
92 buf, CX_STREAM_COPY_BUF_SIZE, n);
93 }
94