mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
/** Message related functions.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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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 3 of the License, or
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* 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 <cstring>
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#include <arpa/inet.h>
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#include <villas/formats/villas_binary.hpp>
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#include <villas/formats/msg.hpp>
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#include <villas/formats/msg_format.hpp>
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#include <villas/sample.h>
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#include <villas/utils.hpp>
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using namespace villas::node;
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int VillasBinaryFormat::sprint(char *buf, size_t len, size_t *wbytes, const struct sample * const smps[], unsigned cnt)
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{
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int ret;
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unsigned i = 0;
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char *ptr = buf;
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for (i = 0; i < cnt; i++) {
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struct msg *msg = (struct msg *) ptr;
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const struct sample *smp = smps[i];
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if (ptr + MSG_LEN(smp->length) > buf + len)
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break;
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ret = msg_from_sample(msg, smp, smp->signals);
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if (ret)
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return ret;
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if (web) {
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/** @todo convert to little endian */
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}
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else
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msg_hton(msg);
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ptr += MSG_LEN(smp->length);
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}
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if (wbytes)
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*wbytes = ptr - buf;
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return i;
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}
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int VillasBinaryFormat::sscan(const char *buf, size_t len, size_t *rbytes, struct sample * const smps[], unsigned cnt)
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{
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int ret, values;
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unsigned i = 0;
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const char *ptr = buf;
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if (len % 4 != 0)
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return -1; /* Packet size is invalid: Must be multiple of 4 bytes */
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for (i = 0; i < cnt; i++) {
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struct msg *msg = (struct msg *) ptr;
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struct sample *smp = smps[i];
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smp->signals = signals;
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/* Complete buffer has been parsed */
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if (ptr == buf + len)
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break;
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/* Check if header is still in buffer bounaries */
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if (ptr + sizeof(struct msg) > buf + len)
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return -2; /* Invalid msg received */
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values = web ? msg->length : ntohs(msg->length);
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/* Check if remainder of message is in buffer boundaries */
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if (ptr + MSG_LEN(values) > buf + len)
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return -3; /*Invalid msg receive */
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if (web) {
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/** @todo convert from little endian */
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}
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else
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msg_ntoh(msg);
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ret = msg_to_sample(msg, smp, signals);
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if (ret)
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return ret; /* Invalid msg received */
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ptr += MSG_LEN(smp->length);
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}
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if (rbytes)
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*rbytes = ptr - buf;
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return i;
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}
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static VillasBinaryFormatPlugin<false> p1;
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static VillasBinaryFormatPlugin<true> p2;
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