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binary_helpers: Add bv_get_value function.
[libsigrok.git] / src / binary_helpers.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2020 Andreas Sandberg <andreas@sandberg.pp.se>
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <config.h>
21 #include <glib.h>
22 #include <libsigrok/libsigrok.h>
23 #include "libsigrok-internal.h"
24
25 SR_PRIV int bv_get_value_len(float *out, const struct binary_value_spec *spec,
26         const uint8_t *data, size_t length)
27 {
28         float value;
29
30         if (!out || !spec || !data)
31                 return SR_ERR_ARG;
32
33 #define VALUE_TYPE(T, R, L)                             \
34         case T:                                         \
35                 if (spec->offset + (L) > length)        \
36                         return SR_ERR_DATA;             \
37                 value = R(data + spec->offset);         \
38                 break
39
40         switch (spec->type) {
41         VALUE_TYPE(BVT_UINT8, read_u8, sizeof(uint8_t));
42
43         VALUE_TYPE(BVT_BE_UINT16, read_u16be, sizeof(uint16_t));
44         VALUE_TYPE(BVT_BE_UINT24, read_u24be, 3 * sizeof(uint8_t));
45         VALUE_TYPE(BVT_BE_UINT32, read_u32be, sizeof(uint32_t));
46         VALUE_TYPE(BVT_BE_UINT64, read_u64be, sizeof(uint64_t));
47         VALUE_TYPE(BVT_BE_FLOAT,  read_fltbe, sizeof(float));
48
49         VALUE_TYPE(BVT_LE_UINT16, read_u16le, sizeof(uint16_t));
50         VALUE_TYPE(BVT_LE_UINT24, read_u24le, 3 * sizeof(uint8_t));
51         VALUE_TYPE(BVT_LE_UINT32, read_u32le, sizeof(uint32_t));
52         VALUE_TYPE(BVT_LE_UINT64, read_u64le, sizeof(uint64_t));
53         VALUE_TYPE(BVT_LE_FLOAT,  read_fltle, sizeof(float));
54
55         default:
56                 return SR_ERR_ARG;
57         }
58
59 #undef VALUE_TYPE
60
61         if (out)
62                 *out = value;
63         return SR_OK;
64 }
65
66 SR_PRIV int bv_get_value(float *out, const struct binary_value_spec *spec,
67         const uint8_t *data)
68 {
69         float value;
70         const uint8_t *ptr;
71
72         ptr = &data[spec->offset];
73
74         switch (spec->type) {
75         case BVT_UINT8:
76                 value = read_u8(ptr);
77                 break;
78         case BVT_BE_UINT16:
79                 value = read_u16be(ptr);
80                 break;
81         case BVT_BE_UINT24:
82                 value = read_u24be(ptr);
83                 break;
84         case BVT_BE_UINT32:
85                 value = read_u32be(ptr);
86                 break;
87         case BVT_BE_UINT64:
88                 value = read_u64be(ptr);
89                 break;
90         case BVT_BE_FLOAT:
91                 value = read_fltbe(ptr);
92                 break;
93         case BVT_LE_UINT16:
94                 value = read_u16le(ptr);
95                 break;
96         case BVT_LE_UINT24:
97                 value = read_u24le(ptr);
98                 break;
99         case BVT_LE_UINT32:
100                 value = read_u32le(ptr);
101                 break;
102         case BVT_LE_UINT64:
103                 value = read_u64le(ptr);
104                 break;
105         case BVT_LE_FLOAT:
106                 value = read_fltle(ptr);
107                 break;
108         default:
109                 return SR_ERR_ARG;
110         }
111
112         if (out)
113                 *out = value;
114         return SR_OK;
115 }