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 #include "cx/allocator.h"
31
32 #ifndef CX_STREAM_BCOPY_BUF_SIZE
33 #define CX_STREAM_BCOPY_BUF_SIZE 8192
34 #endif
35
36 #ifndef CX_STREAM_COPY_BUF_SIZE
37 #define CX_STREAM_COPY_BUF_SIZE 1024
38 #endif
39
40 size_t cx_stream_bncopy(
41 void *src,
42 void *dest,
43 cx_read_func rfnc,
44 cx_write_func wfnc,
45 char *buf,
46 size_t bufsize,
47 size_t n
48 ) {
49 if (n == 0) {
50 return 0;
51 }
52
53 char *lbuf;
54 size_t ncp = 0;
55
56 if (buf) {
57 if (bufsize == 0) return 0;
58 lbuf = buf;
59 } else {
60 if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE;
61 lbuf = cxMallocDefault(bufsize);
62 if (lbuf == NULL) return 0;
63 }
64
65 size_t r;
66 size_t rn = bufsize > n ? n : bufsize;
67 while ((r = rfnc(lbuf, 1, rn, src)) != 0) {
68 r = wfnc(lbuf, 1, r, dest);
69 ncp += r;
70 n -= r;
71 rn = bufsize > n ? n : bufsize;
72 if (r == 0 || n == 0) {
73 break;
74 }
75 }
76
77 if (lbuf != buf) {
78 cxFreeDefault(lbuf);
79 }
80
81 return ncp;
82 }
83
84 size_t cx_stream_ncopy(
85 void *src,
86 void *dest,
87 cx_read_func rfnc,
88 cx_write_func wfnc,
89 size_t n
90 ) {
91 char buf[CX_STREAM_COPY_BUF_SIZE];
92 return cx_stream_bncopy(src, dest, rfnc, wfnc,
93 buf, CX_STREAM_COPY_BUF_SIZE, n);
94 }
95