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/*
net-sendbuffer.c : Buffered send()
Copyright (C) 1998-2000 Timo Sirainen
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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "module.h"
#include "network.h"
#include "net-sendbuffer.h"
#include "line-split.h"
/* Create new buffer - if `bufsize' is zero or less, DEFAULT_BUFFER_SIZE
is used */
NET_SENDBUF_REC *net_sendbuffer_create(GIOChannel *handle, int bufsize)
{
NET_SENDBUF_REC *rec;
g_return_val_if_fail(handle != NULL, NULL);
rec = g_new0(NET_SENDBUF_REC, 1);
rec->send_tag = -1;
rec->handle = handle;
rec->bufsize = bufsize > 0 ? bufsize : DEFAULT_BUFFER_SIZE;
rec->def_bufsize = rec->bufsize;
return rec;
}
/* Destroy the buffer. `close' specifies if socket handle should be closed. */
void net_sendbuffer_destroy(NET_SENDBUF_REC *rec, int close)
{
if (rec->send_tag != -1) g_source_remove(rec->send_tag);
if (close) net_disconnect(rec->handle);
if (rec->readbuffer != NULL) line_split_free(rec->readbuffer);
g_free_not_null(rec->buffer);
g_free(rec);
}
/* Transmit all data from buffer - return TRUE if the whole buffer was sent */
static int buffer_send(NET_SENDBUF_REC *rec)
{
int ret;
ret = net_transmit(rec->handle, rec->buffer, rec->bufpos);
if (ret < 0 || rec->bufpos == ret) {
/* error/all sent - don't try to send it anymore */
rec->bufsize = rec->def_bufsize;
rec->buffer = g_realloc(rec->buffer, rec->bufsize);
rec->bufpos = 0;
return TRUE;
}
if (ret > 0) {
rec->bufpos -= ret;
g_memmove(rec->buffer, rec->buffer+ret, rec->bufpos);
}
return FALSE;
}
static void sig_sendbuffer(NET_SENDBUF_REC *rec)
{
if (rec->buffer != NULL) {
if (!buffer_send(rec))
return;
}
g_source_remove(rec->send_tag);
rec->send_tag = -1;
}
/* Add `data' to transmit buffer - return FALSE if buffer is full */
static int buffer_add(NET_SENDBUF_REC *rec, const void *data, int size)
{
if (rec->buffer == NULL) {
rec->buffer = g_malloc(rec->bufsize);
rec->bufpos = 0;
}
while (rec->bufpos+size > rec->bufsize) {
if (rec->bufsize >= MAX_BUFFER_SIZE) {
if (!rec->dead)
g_warning("Dropping some data on an outgoing connection");
rec->dead = 1;
return FALSE;
}
rec->bufsize *= 2;
rec->buffer = g_realloc(rec->buffer, rec->bufsize);
}
memcpy(rec->buffer+rec->bufpos, data, size);
rec->bufpos += size;
return TRUE;
}
/* Send data, if all of it couldn't be sent immediately, it will be resent
automatically after a while. Returns -1 if some unrecoverable error
occured. */
int net_sendbuffer_send(NET_SENDBUF_REC *rec, const void *data, int size)
{
int ret;
g_return_val_if_fail(rec != NULL, -1);
g_return_val_if_fail(data != NULL, -1);
if (size <= 0) return 0;
if (rec->buffer == NULL || rec->bufpos == 0) {
/* nothing in buffer - transmit immediately */
ret = net_transmit(rec->handle, data, size);
if (ret < 0) return -1;
size -= ret;
data = ((const char *) data) + ret;
}
if (size <= 0)
return 0;
/* everything couldn't be sent. */
if (rec->send_tag == -1) {
rec->send_tag =
g_input_add(rec->handle, G_INPUT_WRITE,
(GInputFunction) sig_sendbuffer, rec);
}
return buffer_add(rec, data, size) ? 0 : -1;
}
int net_sendbuffer_receive_line(NET_SENDBUF_REC *rec, char **str, int read_socket)
{
char tmpbuf[2048];
int recvlen = 0;
if (read_socket)
recvlen = net_receive(rec->handle, tmpbuf, sizeof(tmpbuf));
return line_split(tmpbuf, recvlen, str, &rec->readbuffer);
}
/* Flush the buffer, blocks until finished. */
void net_sendbuffer_flush(NET_SENDBUF_REC *rec)
{
int handle;
if (rec->buffer == NULL)
return;
/* set the socket blocking while doing this */
handle = g_io_channel_unix_get_fd(rec->handle);
#ifndef WIN32
fcntl(handle, F_SETFL, 0);
#endif
while (!buffer_send(rec)) ;
#ifndef WIN32
fcntl(handle, F_SETFL, O_NONBLOCK);
#endif
}
/* Returns the socket handle */
GIOChannel *net_sendbuffer_handle(NET_SENDBUF_REC *rec)
{
g_return_val_if_fail(rec != NULL, NULL);
return rec->handle;
}
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