void evbuffer_commit_read_(struct evbuffer *evbuf, ev_ssize_t nBytes)
{
struct evbuffer_overlapped *buf = upcast_evbuffer(evbuf);
struct evbuffer_chain **chainp;
size_t remaining, len;
unsigned i;
EVUTIL_ASSERT(buf->read_in_progress && !buf->write_in_progress);
EVUTIL_ASSERT(nBytes >= 0); /* XXXX Can this be false? */
evbuffer_unfreeze(evbuf, 0);
chainp = evbuf->last_with_datap;
if (!((*chainp)->flags & EVBUFFER_MEM_PINNED_R))
chainp = &(*chainp)->next;
remaining = nBytes;
for (i = 0; remaining > 0 && i < (unsigned)buf->n_buffers; ++i)
{
EVUTIL_ASSERT(*chainp);
len = buf->buffers[i].len;
if (remaining < len)
len = remaining;
(*chainp)->off += len;
evbuf->last_with_datap = chainp;
remaining -= len;
chainp = &(*chainp)->next;
}
pin_release(buf, EVBUFFER_MEM_PINNED_R);
buf->read_in_progress = 0;
evbuf->total_len += nBytes;
evbuf->n_add_for_cb += nBytes;
evbuffer_invoke_callbacks_(evbuf);
evbuffer_decref(evbuf);
}
int
evbuffer_launch_read(struct evbuffer *buf, size_t at_most,
struct event_overlapped *ol)
{
struct evbuffer_overlapped *buf_o = upcast_evbuffer(buf);
int r = -1, i;
int nvecs;
int npin=0;
struct evbuffer_chain *chain=NULL, **chainp;
DWORD bytesRead;
DWORD flags = 0;
struct evbuffer_iovec vecs[MAX_WSABUFS];
if (!buf_o)
return -1;
EVBUFFER_LOCK(buf);
EVUTIL_ASSERT(!buf_o->write_in_progress);
if (buf->freeze_end || buf_o->read_in_progress)
goto done;
buf_o->first_pinned = NULL;
buf_o->n_buffers = 0;
memset(buf_o->buffers, 0, sizeof(buf_o->buffers));
if (_evbuffer_expand_fast(buf, at_most, MAX_WSABUFS) == -1)
goto done;
evbuffer_freeze(buf, 0);
nvecs = _evbuffer_read_setup_vecs(buf, at_most,
vecs, MAX_WSABUFS, &chainp, 1);
for (i=0;i<nvecs;++i) {
WSABUF_FROM_EVBUFFER_IOV(
&buf_o->buffers[i],
&vecs[i]);
}
buf_o->n_buffers = nvecs;
buf_o->first_pinned = chain = *chainp;
npin=0;
for ( ; chain; chain = chain->next) {
_evbuffer_chain_pin(chain, EVBUFFER_MEM_PINNED_R);
++npin;
}
EVUTIL_ASSERT(npin == nvecs);
_evbuffer_incref(buf);
if (WSARecv(buf_o->fd, buf_o->buffers, nvecs, &bytesRead, &flags,
&ol->overlapped, NULL)) {
int error = WSAGetLastError();
if (error != WSA_IO_PENDING) {
/* An actual error. */
pin_release(buf_o, EVBUFFER_MEM_PINNED_R);
evbuffer_unfreeze(buf, 0);
evbuffer_free(buf); /* decref */
goto done;
}
}
buf_o->read_in_progress = 1;
r = 0;
done:
EVBUFFER_UNLOCK(buf);
return r;
}
int
evbuffer_launch_write(struct evbuffer *buf, ev_ssize_t at_most,
struct event_overlapped *ol)
{
struct evbuffer_overlapped *buf_o = upcast_evbuffer(buf);
int r = -1;
int i;
struct evbuffer_chain *chain;
DWORD bytesSent;
if (!buf) {
/* No buffer, or it isn't overlapped */
return -1;
}
EVBUFFER_LOCK(buf);
EVUTIL_ASSERT(!buf_o->read_in_progress);
if (buf->freeze_start || buf_o->write_in_progress)
goto done;
if (!buf->total_len) {
/* Nothing to write */
r = 0;
goto done;
} else if (at_most < 0 || (size_t)at_most > buf->total_len) {
at_most = buf->total_len;
}
evbuffer_freeze(buf, 1);
buf_o->first_pinned = NULL;
buf_o->n_buffers = 0;
memset(buf_o->buffers, 0, sizeof(buf_o->buffers));
chain = buf_o->first_pinned = buf->first;
for (i=0; i < MAX_WSABUFS && chain; ++i, chain=chain->next) {
WSABUF *b = &buf_o->buffers[i];
b->buf = (char*)( chain->buffer + chain->misalign );
_evbuffer_chain_pin(chain, EVBUFFER_MEM_PINNED_W);
if ((size_t)at_most > chain->off) {
/* XXXX Cast is safe for now, since win32 has no
mmaped chains. But later, we need to have this
add more WSAbufs if chain->off is greater than
ULONG_MAX */
b->len = (unsigned long)chain->off;
at_most -= chain->off;
} else {
b->len = (unsigned long)at_most;
++i;
break;
}
}
buf_o->n_buffers = i;
_evbuffer_incref(buf);
if (WSASend(buf_o->fd, buf_o->buffers, i, &bytesSent, 0,
&ol->overlapped, NULL)) {
int error = WSAGetLastError();
if (error != WSA_IO_PENDING) {
/* An actual error. */
pin_release(buf_o, EVBUFFER_MEM_PINNED_W);
evbuffer_unfreeze(buf, 1);
evbuffer_free(buf); /* decref */
goto done;
}
}
buf_o->write_in_progress = 1;
r = 0;
done:
EVBUFFER_UNLOCK(buf);
return r;
}