80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <string.h>
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#include <libsigrok/libsigrok.h>
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#include "libsigrok-internal.h"
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#define LOG_PREFIX "transform/invert"
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static int receive(const struct sr_transform *t,
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struct sr_datafeed_packet *packet_in,
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struct sr_datafeed_packet **packet_out)
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{
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const struct sr_datafeed_logic *logic;
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const struct sr_datafeed_analog *analog;
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uint8_t *b;
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int64_t p;
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uint64_t i, j, q;
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if (!t || !t->sdi || !packet_in || !packet_out)
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return SR_ERR_ARG;
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switch (packet_in->type) {
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case SR_DF_LOGIC:
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logic = packet_in->payload;
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for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) {
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for (j = 0; j < logic->unitsize; j++) {
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/* For now invert every bit in every byte. */
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b = (uint8_t *)logic->data + i + logic->unitsize - 1 - j;
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*b = ~(*b);
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}
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}
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break;
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case SR_DF_ANALOG:
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analog = packet_in->payload;
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p = analog->encoding->scale.p;
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q = analog->encoding->scale.q;
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if (q > INT64_MAX)
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return SR_ERR;
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analog->encoding->scale.p = (p < 0) ? -q : q;
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analog->encoding->scale.q = (p < 0) ? -p : p;
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break;
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default:
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sr_spew("Unsupported packet type %d, ignoring.", packet_in->type);
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break;
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}
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/* Return the in-place-modified packet. */
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*packet_out = packet_in;
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return SR_OK;
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}
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SR_PRIV struct sr_transform_module transform_invert = {
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.id = "invert",
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.name = "Invert",
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.desc = "Invert values",
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.options = NULL,
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.init = NULL,
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.receive = receive,
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.cleanup = NULL,
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};
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