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VILLASnode/lib/formats/villas_binary.cpp

158 lines
4.3 KiB
C++

/** Message related functions.
*
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
* @license GNU General Public License (version 3)
*
* VILLASnode
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************************/
#include <cstring>
#include <villas/io.h>
#include <villas/formats/villas_binary.h>
#include <villas/formats/msg.h>
#include <villas/formats/msg_format.h>
#include <villas/sample.h>
#include <villas/utils.hpp>
#include <villas/plugin.h>
int villas_binary_sprint(struct io *io, char *buf, size_t len, size_t *wbytes, struct sample *smps[], unsigned cnt)
{
int ret;
unsigned i = 0;
char *ptr = buf;
for (i = 0; i < cnt; i++) {
struct msg *msg = (struct msg *) ptr;
struct sample *smp = smps[i];
if (ptr + MSG_LEN(smp->length) > buf + len)
break;
ret = msg_from_sample(msg, smp, smp->signals);
if (ret)
return ret;
if (io->flags & VILLAS_BINARY_WEB) {
/** @todo convert to little endian */
}
else
msg_hton(msg);
ptr += MSG_LEN(smp->length);
}
if (wbytes)
*wbytes = ptr - buf;
return i;
}
int villas_binary_sscan(struct io *io, const char *buf, size_t len, size_t *rbytes, struct sample *smps[], unsigned cnt)
{
int ret, values;
unsigned i = 0;
const char *ptr = buf;
if (len % 4 != 0) {
warning("Packet size is invalid: %zd Must be multiple of 4 bytes.", len);
return -1;
}
for (i = 0; i < cnt; i++) {
struct msg *msg = (struct msg *) ptr;
struct sample *smp = smps[i];
smp->signals = io->signals;
/* Complete buffer has been parsed */
if (ptr == buf + len)
break;
/* Check if header is still in buffer bounaries */
if (ptr + sizeof(struct msg) > buf + len) {
warning("Invalid msg received: reason=1");
break;
}
values = (io->flags & VILLAS_BINARY_WEB) ? msg->length : ntohs(msg->length);
/* Check if remainder of message is in buffer boundaries */
if (ptr + MSG_LEN(values) > buf + len) {
warning("Invalid msg received: reason=2, msglen=%zu, len=%zu, ptr=%p, buf=%p, i=%u", MSG_LEN(values), len, ptr, buf, i);
break;
}
if (io->flags & VILLAS_BINARY_WEB) {
/** @todo convert from little endian */
}
else
msg_ntoh(msg);
ret = msg_to_sample(msg, smp, io->signals);
if (ret) {
warning("Invalid msg received: reason=3, ret=%d", ret);
break;
}
ptr += MSG_LEN(smp->length);
}
if (rbytes)
*rbytes = ptr - buf;
return i;
}
static struct plugin p1;
__attribute__((constructor(110))) static void UNIQUE(__ctor)() {
p1.name = "villas.binary";
p1.description = "VILLAS binary network format";
p1.type = PluginType::FORMAT;
p1.format.sprint = villas_binary_sprint;
p1.format.sscan = villas_binary_sscan;
p1.format.size = 0;
p1.format.flags = (int) IOFlags::HAS_BINARY_PAYLOAD |
(int) SampleFlags::HAS_TS_ORIGIN | (int) SampleFlags::HAS_SEQUENCE | (int) SampleFlags::HAS_DATA;
vlist_push(&plugins, &p1);
}
__attribute__((destructor(110))) static void UNIQUE(__dtor)() {
vlist_remove_all(&plugins, &p1);
}
/** The WebSocket node-type usually uses little endian byte order intead of network byte order */
static struct plugin p2;
__attribute__((constructor(110))) static void UNIQUE(__ctor)() {
p2.name = "villas.web";
p2.description = "VILLAS binary network format for WebSockets";
p2.type = PluginType::FORMAT;
p2.format.sprint = villas_binary_sprint;
p2.format.sscan = villas_binary_sscan;
p2.format.size = 0;
p2.format.flags = (int) IOFlags::HAS_BINARY_PAYLOAD | VILLAS_BINARY_WEB |
(int) SampleFlags::HAS_TS_ORIGIN | (int) SampleFlags::HAS_SEQUENCE | (int) SampleFlags::HAS_DATA;
vlist_push(&plugins, &p2);
}
__attribute__((destructor(110))) static void UNIQUE(__dtor)() {
vlist_remove_all(&plugins, &p2);
}