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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de> | |
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 2 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 <string.h> | |
22 | #include <libsigrok/libsigrok.h> | |
23 | #include "libsigrok-internal.h" | |
24 | ||
25 | #define LOG_PREFIX "transform/invert" | |
26 | ||
27 | static int receive(const struct sr_transform *t, | |
28 | struct sr_datafeed_packet *packet_in, | |
29 | struct sr_datafeed_packet **packet_out) | |
30 | { | |
31 | const struct sr_datafeed_logic *logic; | |
32 | const struct sr_datafeed_analog *analog; | |
33 | uint8_t *b; | |
34 | int64_t p; | |
35 | uint64_t i, j, q; | |
36 | ||
37 | if (!t || !t->sdi || !packet_in || !packet_out) | |
38 | return SR_ERR_ARG; | |
39 | ||
40 | switch (packet_in->type) { | |
41 | case SR_DF_LOGIC: | |
42 | logic = packet_in->payload; | |
43 | for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) { | |
44 | for (j = 0; j < logic->unitsize; j++) { | |
45 | /* For now invert every bit in every byte. */ | |
46 | b = (uint8_t *)logic->data + i + logic->unitsize - 1 - j; | |
47 | *b = ~(*b); | |
48 | } | |
49 | } | |
50 | break; | |
51 | case SR_DF_ANALOG: | |
52 | analog = packet_in->payload; | |
53 | p = analog->encoding->scale.p; | |
54 | q = analog->encoding->scale.q; | |
55 | if (q > INT64_MAX) | |
56 | return SR_ERR; | |
57 | analog->encoding->scale.p = (p < 0) ? -q : q; | |
58 | analog->encoding->scale.q = (p < 0) ? -p : p; | |
59 | break; | |
60 | default: | |
61 | sr_spew("Unsupported packet type %d, ignoring.", packet_in->type); | |
62 | break; | |
63 | } | |
64 | ||
65 | /* Return the in-place-modified packet. */ | |
66 | *packet_out = packet_in; | |
67 | ||
68 | return SR_OK; | |
69 | } | |
70 | ||
71 | SR_PRIV struct sr_transform_module transform_invert = { | |
72 | .id = "invert", | |
73 | .name = "Invert", | |
74 | .desc = "Invert values", | |
75 | .options = NULL, | |
76 | .init = NULL, | |
77 | .receive = receive, | |
78 | .cleanup = NULL, | |
79 | }; |