int virtual_stream_get_data(VirtualStream * stream, char * buf, size_t buf_size, size_t * data_size, int * eos) {
size_t len;
assert(stream->magic == STREAM_MAGIC);
len = (stream->buf_inp + stream->buf_len - stream->buf_out) % stream->buf_len;
if (len > buf_size) {
len = buf_size;
*eos = 0;
}
else {
*eos = stream->eos_inp;
}
*data_size = len;
if (*eos) stream->eos_out = 1;
if (stream->buf_out + len <= stream->buf_len) {
memcpy(buf, stream->buf + stream->buf_out, len);
}
else {
size_t x = stream->buf_len - stream->buf_out;
size_t y = len - x;
memcpy(buf, stream->buf + stream->buf_out, x);
memcpy(buf + x, stream->buf, y);
}
if (stream->access & VS_ENABLE_REMOTE_WRITE) {
LINK * l;
for (l = stream->clients.next; l != &stream->clients; l = l->next) {
StreamClient * client = stream2client(l);
if (!list_is_empty(&client->write_requests)) {
WriteRequest * r = client2write_request(client->write_requests.next);
size_t done = 0;
int error = 0;
if (virtual_stream_add_data(client->stream, r->data + r->offs,
r->size - r->offs, &done, r->eos) < 0) error = errno;
r->offs += done;
if (error || r->offs >= r->size) {
delete_write_request(r, error);
}
while (error && !list_is_empty(&client->write_requests)) {
r = client2write_request(client->write_requests.next);
delete_write_request(r, ERR_COMMAND_CANCELLED);
}
}
}
}
if ((stream->access & VS_ENABLE_REMOTE_READ) == 0 && len > 0) {
stream->buf_out = (stream->buf_out + len) % stream->buf_len;
assert(!*eos || stream->buf_out == stream->buf_inp);
if (!stream->space_available_posted) {
post_event(notify_space_available, stream);
stream->space_available_posted = 1;
}
}
return 0;
}
static void delete_client(StreamClient * client) {
VirtualStream * stream = client->stream;
Trap trap;
LINK * n;
assert(stream->ref_cnt > 0);
if (set_trap(&trap)) {
send_event_stream_disposed(&client->channel->out, stream);
clear_trap(&trap);
}
else {
trace(LOG_ALWAYS, "Exception sending stream deleted event: %d %s",
trap.error, errno_to_str(trap.error));
}
list_remove(&client->link_hash);
list_remove(&client->link_stream);
list_remove(&client->link_all);
for (n = client->read_requests.next; n != &client->read_requests;) {
ReadRequest * r = client2read_request(n);
n = n->next;
delete_read_request(r);
}
for (n = client->write_requests.next; n != &client->write_requests;) {
WriteRequest * r = client2write_request(n);
n = n->next;
delete_write_request(r, ERR_COMMAND_CANCELLED);
}
loc_free(client);
if (--stream->ref_cnt == 0) {
assert(list_is_empty(&stream->clients));
assert(stream->deleted);
post_event(delete_stream, stream);
}
else if (stream->access & VS_ENABLE_REMOTE_READ) {
advance_stream_buffer(stream);
}
}
