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/* libpq_support.c - functions not provided by libpq, but which are
* required for advanced communication with the server, such as
* streaming replication
*
* Copyright (C) 2003-2019 Federico Di Gregorio <fog@debian.org>
* Copyright (C) 2020 The Psycopg Team
*
* This file is part of psycopg.
*
* psycopg2 is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* In addition, as a special exception, the copyright holders give
* permission to link this program with the OpenSSL library (or with
* modified versions of OpenSSL that use the same license as OpenSSL),
* and distribute linked combinations including the two.
*
* You must obey the GNU Lesser General Public License in all respects for
* all of the code used other than OpenSSL.
*
* psycopg2 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 Lesser General Public
* License for more details.
*/
#define PSYCOPG_MODULE
#include "psycopg/psycopg.h"
#include "psycopg/libpq_support.h"
/* htonl(), ntohl() */
#ifdef _WIN32
#include <winsock2.h>
/* gettimeofday() */
#include "psycopg/win32_support.h"
#else
#include <arpa/inet.h>
#endif
/* support routines taken from pg_basebackup/streamutil.c */
/*
* Frontend version of GetCurrentTimestamp(), since we are not linked with
* backend code. The protocol always uses integer timestamps, regardless of
* server setting.
*/
int64_t
feGetCurrentTimestamp(void)
{
int64_t result;
struct timeval tp;
gettimeofday(&tp, NULL);
result = (int64_t) tp.tv_sec -
((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY);
result = (result * USECS_PER_SEC) + tp.tv_usec;
return result;
}
/*
* Converts an int64 to network byte order.
*/
void
fe_sendint64(int64_t i, char *buf)
{
uint32_t n32;
/* High order half first, since we're doing MSB-first */
n32 = (uint32_t) (i >> 32);
n32 = htonl(n32);
memcpy(&buf[0], &n32, 4);
/* Now the low order half */
n32 = (uint32_t) i;
n32 = htonl(n32);
memcpy(&buf[4], &n32, 4);
}
/*
* Converts an int64 from network byte order to native format.
*/
int64_t
fe_recvint64(char *buf)
{
int64_t result;
uint32_t h32;
uint32_t l32;
memcpy(&h32, buf, 4);
memcpy(&l32, buf + 4, 4);
h32 = ntohl(h32);
l32 = ntohl(l32);
result = h32;
result <<= 32;
result |= l32;
return result;
}
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