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/*
* Copyright 2008-2013 Various Authors
* Copyright 2004 Timo Hirvonen
*
* 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 2 of the
* License, or (at your option) 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 "read_wrapper.h"
#include "ip.h"
#include "file.h"
#include <unistd.h>
ssize_t read_wrapper(struct input_plugin_data *ip_data, void *buffer, size_t count)
{
int rc;
if (ip_data->metaint == 0) {
/* no metadata in the stream */
return read(ip_data->fd, buffer, count);
}
if (ip_data->counter == ip_data->metaint) {
/* read metadata */
unsigned char byte;
int len;
rc = read(ip_data->fd, &byte, 1);
if (rc == -1)
return -1;
if (rc == 0)
return 0;
if (byte != 0) {
len = ((int)byte) * 16;
ip_data->metadata[0] = 0;
rc = read_all(ip_data->fd, ip_data->metadata, len);
if (rc == -1)
return -1;
if (rc < len) {
ip_data->metadata[0] = 0;
return 0;
}
ip_data->metadata[len] = 0;
ip_data->metadata_changed = 1;
}
ip_data->counter = 0;
}
if (count + ip_data->counter > ip_data->metaint)
count = ip_data->metaint - ip_data->counter;
rc = read(ip_data->fd, buffer, count);
if (rc > 0)
ip_data->counter += rc;
return rc;
}
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