1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* $OpenBSD: tools.c,v 1.1 2010/11/06 20:25:42 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sndio.h>
#include "tools.h"
/*
* Generate a string corresponding to the encoding in par,
* return the length of the resulting string
*/
int
sio_enctostr(struct sio_par *par, char *ostr)
{
char *p = ostr;
*p++ = par->sig ? 's' : 'u';
if (par->bits > 9)
*p++ = '0' + par->bits / 10;
*p++ = '0' + par->bits % 10;
if (par->bps > 1) {
*p++ = par->le ? 'l' : 'b';
*p++ = 'e';
if (par->bps != SIO_BPS(par->bits) ||
par->bits < par->bps * 8) {
*p++ = par->bps + '0';
if (par->bits < par->bps * 8) {
*p++ = par->msb ? 'm' : 'l';
*p++ = 's';
*p++ = 'b';
}
}
}
*p++ = '\0';
return p - ostr - 1;
}
/*
* Parse an encoding string, examples: s8, u8, s16, s16le, s24be ...
* Return the number of bytes consumed
*/
int
sio_strtoenc(struct sio_par *par, char *istr)
{
char *p = istr;
int i, sig, bits, le, bps, msb;
#define IS_SEP(c) \
(((c) < 'a' || (c) > 'z') && \
((c) < 'A' || (c) > 'Z') && \
((c) < '0' || (c) > '9'))
/*
* get signedness
*/
if (*p == 's') {
sig = 1;
} else if (*p == 'u') {
sig = 0;
} else
return 0;
p++;
/*
* get number of bits per sample
*/
bits = 0;
for (i = 0; i < 2; i++) {
if (*p < '0' || *p > '9')
break;
bits = (bits * 10) + *p - '0';
p++;
}
if (bits < 1 || bits > 32)
return 0;
bps = SIO_BPS(bits);
le = SIO_LE_NATIVE;
msb = 1;
/*
* get (optional) endianness
*/
if (p[0] == 'l' && p[1] == 'e') {
le = 1;
p += 2;
} else if (p[0] == 'b' && p[1] == 'e') {
le = 0;
p += 2;
} else if (IS_SEP(*p)) {
goto done;
} else
return 0;
/*
* get (optional) number of bytes
*/
if (*p >= '1' && *p <= '4') {
bps = *p - '0';
if (bps * 8 < bits)
return 0;
p++;
/*
* get (optional) alignment
*/
if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') {
msb = 1;
p += 3;
} else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') {
msb = 0;
p += 3;
} else if (IS_SEP(*p)) {
goto done;
} else
return 0;
} else if (!IS_SEP(*p))
return 0;
done:
par->msb = msb;
par->sig = sig;
par->bits = bits;
par->bps = bps;
par->le = le;
return p - istr;
}
|
