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/utils.h"
30
31 #define CX_STREAM_BCOPY_BUF_SIZE 8192
32 #define CX_STREAM_COPY_BUF_SIZE 1024
33
34 size_t cx_stream_bncopy(
35 void *src,
36 void *dest,
37 cx_read_func rfnc,
38 cx_write_func wfnc,
39 char *buf,
40 size_t bufsize,
41 size_t n
42 ) {
43 if (n == 0) {
44 return 0;
45 }
46
47 char *lbuf;
48 size_t ncp = 0;
49
50 if (buf) {
51 if (bufsize == 0) return 0;
52 lbuf = buf;
53 } else {
54 if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE;
55 lbuf = malloc(bufsize);
56 if (lbuf == NULL) {
57 return 0;
58 }
59 }
60
61 size_t r;
62 size_t rn = bufsize > n ? n : bufsize;
63 while ((r = rfnc(lbuf, 1, rn, src)) != 0) {
64 r = wfnc(lbuf, 1, r, dest);
65 ncp += r;
66 n -= r;
67 rn = bufsize > n ? n : bufsize;
68 if (r == 0 || n == 0) {
69 break;
70 }
71 }
72
73 if (lbuf != buf) {
74 free(lbuf);
75 }
76
77 return ncp;
78 }
79
80 size_t cx_stream_ncopy(
81 void *src,
82 void *dest,
83 cx_read_func rfnc,
84 cx_write_func wfnc,
85 size_t n
86 ) {
87 char buf[CX_STREAM_COPY_BUF_SIZE];
88 return cx_stream_bncopy(src, dest, rfnc, wfnc,
89 buf, CX_STREAM_COPY_BUF_SIZE, n);
90 }
91
92 #ifndef CX_SZMUL_BUILTIN
93 #include "szmul.c"
94 #endif
95