uhub/src/hubio.c

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/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2009, Jan Vidar Krey
*
* 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
* (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 "uhub.h"
#include "hubio.h"
#define SEND_CHUNKS 1
/* FIXME: This should not be needed! */
extern struct hub_info* g_hub;
struct hub_recvq* hub_recvq_create()
{
struct hub_recvq* q = hub_malloc_zero(sizeof(struct hub_recvq));
return q;
}
void hub_recvq_destroy(struct hub_recvq* q)
{
if (q)
{
hub_free(q->buf);
hub_free(q);
}
}
size_t hub_recvq_get(struct hub_recvq* q, void* buf, size_t bufsize)
{
assert(bufsize >= q->size);
if (q->size)
{
size_t n = q->size;
memcpy(buf, q->buf, n);
hub_free(q->buf);
q->buf = 0;
q->size = 0;
return n;
}
return 0;
}
size_t hub_recvq_set(struct hub_recvq* q, void* buf, size_t bufsize)
{
if (q->buf)
{
hub_free(q->buf);
q->buf = 0;
q->size = 0;
}
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if (!bufsize)
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{
q->size = 0;
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return 0;
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}
q->buf = hub_malloc(bufsize);
if (!q->buf)
return 0;
q->size = bufsize;
memcpy(q->buf, buf, bufsize);
return bufsize;
}
struct hub_sendq* hub_sendq_create()
{
struct hub_sendq* q = hub_malloc_zero(sizeof(struct hub_sendq));
if (!q)
return 0;
q->queue = list_create();
if (!q->queue)
{
hub_free(q);
return 0;
}
return q;
}
static void clear_send_queue_callback(void* ptr)
{
adc_msg_free((struct adc_message*) ptr);
}
void hub_sendq_destroy(struct hub_sendq* q)
{
if (q)
{
list_clear(q->queue, &clear_send_queue_callback);
list_destroy(q->queue);
hub_free(q);
}
}
void hub_sendq_add(struct hub_sendq* q, struct adc_message* msg_)
{
struct adc_message* msg = adc_msg_incref(msg_);
list_append(q->queue, msg);
q->size += msg->length;
}
void hub_sendq_remove(struct hub_sendq* q, struct adc_message* msg)
{
list_remove(q->queue, msg);
q->size -= msg->length;
adc_msg_free(msg);
q->offset = 0;
}
int hub_sendq_send(struct hub_sendq* q, hub_recvq_write w, void* data)
{
#ifdef SEND_CHUNKS
int ret = 0;
int bytes_sent = 0;
struct adc_message* msg = list_get_first(q->queue);
while (msg)
{
size_t len = msg->length - q->offset;
ret = w(data, &msg->cache[q->offset], len);
if (ret <= 0) break;
q->offset += ret;
bytes_sent += ret;
if (q->offset < msg->length)
break;
hub_sendq_remove(q, msg);
msg = list_get_first(q->queue);
}
return bytes_sent;
#else
int ret = 0;
size_t sent = 0;
size_t bytes = 0;
size_t offset = q->offset; // offset into first message.
size_t length = 0;
size_t msgs = 0;
char* sbuf = g_hub->sendbuf;
size_t max_send_buf = 1000; // MAX_SEND_BUF;
/* Copy as many messages possible into global send queue */
struct adc_message* msg = list_get_first(q->queue);
while (msg)
{
msgs++;
length = MIN(msg->length - offset, (max_send_buf-1) - bytes);
memcpy(sbuf + bytes, msg->cache + offset, length);
bytes += length;
if (length < msg->length - offset)
break;
offset = 0;
msg = list_get_next(q->queue);
}
msg = list_get_first(q->queue);
printf("Queued up bytes: %d, in %d msgs (first=%d/%d)\n", (int) bytes, (int) msgs, (int) q->offset, (msg ? (int) msg->length : 0));
/* Send as much as possible */
ret = w(data, sbuf, bytes);
if (ret > 0)
{
/* Remove messages sent */
offset = q->offset;
msg = list_get_first(q->queue);
while (msg)
{
sent += (msg->length - offset);
offset = 0;
if (sent >= bytes)
break;
printf("removing msg %d [%p]\n", (int) msgs, msg);
hub_sendq_remove(q, msg);
msgs--;
msg = list_get_next(q->queue);
}
q->offset = (bytes - sent);
}
return ret;
#endif
}
int hub_sendq_is_empty(struct hub_sendq* q)
{
return q->size == 0;
}
size_t hub_sendq_get_bytes(struct hub_sendq* q)
{
return q->size - q->offset;
}