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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Bert Vermeulen <bert@biot.com> | |
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 <stdlib.h> | |
21 | #include <stdint.h> | |
22 | #include <string.h> | |
23 | #include <sigrok.h> | |
24 | ||
25 | /* | |
26 | * Convert sample from maximum probes -- the way the hardware driver sent | |
27 | * it -- to a sample taking up only as much space as required, with | |
28 | * unused probes removed. | |
29 | */ | |
30 | int filter_probes(int in_unitsize, int out_unitsize, int *probelist, | |
31 | char *data_in, uint64_t length_in, char **data_out, | |
32 | uint64_t *length_out) | |
33 | { | |
34 | unsigned int in_offset, out_offset; | |
35 | int num_enabled_probes, out_bit, i; | |
36 | uint64_t sample_in, sample_out; | |
37 | ||
38 | if (!(*data_out = malloc(length_in))) | |
39 | return SR_ERR_MALLOC; | |
40 | ||
41 | num_enabled_probes = 0; | |
42 | for (i = 0; probelist[i]; i++) | |
43 | num_enabled_probes++; | |
44 | ||
45 | if (num_enabled_probes == in_unitsize * 8) { | |
46 | /* All probes are used -- no need to compress anything. */ | |
47 | memcpy(*data_out, data_in, length_in); | |
48 | *length_out = length_in; | |
49 | return SR_OK; | |
50 | } | |
51 | ||
52 | /* If we reached this point, not all probes are used, so "compress". */ | |
53 | in_offset = out_offset = 0; | |
54 | while (in_offset <= length_in - in_unitsize) { | |
55 | memcpy(&sample_in, data_in + in_offset, in_unitsize); | |
56 | sample_out = out_bit = 0; | |
57 | for (i = 0; probelist[i]; i++) { | |
58 | if (sample_in & (1 << (probelist[i] - 1))) | |
59 | sample_out |= (1 << out_bit); | |
60 | out_bit++; | |
61 | } | |
62 | memcpy((*data_out) + out_offset, &sample_out, out_unitsize); | |
63 | in_offset += in_unitsize; | |
64 | out_offset += out_unitsize; | |
65 | } | |
66 | *length_out = out_offset; | |
67 | ||
68 | return SR_OK; | |
69 | } |