--- deliantra/server/socket/lowlevel.C 2006/12/15 19:59:20 1.22
+++ deliantra/server/socket/lowlevel.C 2012/11/06 03:45:17 1.87
@@ -1,35 +1,23 @@
/*
- CrossFire, A Multiplayer game for X-windows
-
- Copyright (C) 1992 Frank Tore Johansen
-
- 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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- The author can be reached via e-mail to mark@pyramid.com
-*/
-
-/**
- * \file
- * Low-level socket-related functions.
+ * This file is part of Deliantra, the Roguelike Realtime MMORPG.
+ *
+ * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
+ *
+ * Deliantra is free software: you can redistribute it and/or modify it under
+ * the terms of the Affero 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.
*
- * \date 2003-12-02
+ * You should have received a copy of the Affero GNU General Public License
+ * and the GNU General Public License along with this program. If not, see
+ * .
*
- * Contains some base functions that both the client and server
- * can use. As such, depending what we are being compiled for will
- * determine what we can include. the client is designed have
- * CFCLIENT defined as part of its compile flags.
+ * The authors can be reached via e-mail to
*/
using namespace std;
@@ -38,43 +26,22 @@
#include
#include
-#ifdef __linux__
+#if HAVE_TCP_INFO
# include
# include
# include
-# define TCP_HZ 1000 // sorry...
# include
#endif
-// use a really low timeout, as it doesn't cost any bandwidth, and you can
-// easily die in 20 seconds...
-#define SOCKET_TIMEOUT1 10
-#define SOCKET_TIMEOUT2 20
+// force a packet when idle for more than this many seconds,
+// forcing an ack regularly.
+#define IDLE_PING 2.
void
client::flush ()
{
-#ifdef __linux__
- // check time of last ack, and, if too old, kill connection
- struct tcp_info tcpi;
- socklen_t len = sizeof (tcpi);
-
- if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
- {
- unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
-
- rtt = tcpi.tcpi_rtt;
- rttvar = tcpi.tcpi_rttvar;
-
- if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
- && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
- {
- LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
- (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
- status = Ns_Dead;
- }
- }
-#endif
+ if (destroyed ())
+ return;
/**
* Writes data to socket.
@@ -83,9 +50,24 @@
* is called to write it out.
*/
- if (!outputbuffer.len || socket_ev.poll () & PE_W)
+ // write a nop to the socket at least every IDLE_NOP seconds.
+ if (!outputbuffer.len)
+ {
+ if (last_send + IDLE_PING <= NOW && pl && pl->active)
+ {
+ // this is a bit ugly, but map1a seems to be the only
+ // nop'able command and it is quite small.
+ packet sl ("map1a");
+ send_packet (sl);
+ }
+ else
+ return;
+ }
+
+ if (socket_ev.poll () & EV_WRITE)
return;
+ last_send = NOW;
write_outputbuffer ();
}
@@ -105,15 +87,11 @@
outputbuffer.start = 0;
outputbuffer.len -= res;
-#ifdef CS_LOGSTATS
- cst_tot.obytes += res;
- cst_lst.obytes += res;
-#endif
}
else if (res == 0)
{
LOG (llevError, "socket write failed, connection closed.\n");
- status = Ns_Dead;
+ destroy ();
return;
}
else if (errno == EINTR)
@@ -123,135 +101,384 @@
else if (errno == EAGAIN)
{
// delay till ready
- socket_ev.poll (socket_ev.poll () | PE_W);
+ socket_ev.poll (socket_ev.poll () | EV_WRITE);
socket_ev.start ();
return;
}
else
{
LOG (llevError, "socket write failed: %s\n", strerror (errno));
- status = Ns_Dead;
+ destroy ();
return;
}
}
- socket_ev.poll (socket_ev.poll () & ~PE_W);
+ socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
}
-/***********************************************************************
+/******************************************************************************
*
- * packet functions/utilities
+ * Start of read routines.
*
- **********************************************************************/
+ ******************************************************************************/
-packet &packet::operator <<(const data &v)
+int
+client::next_packet ()
{
- if (room () < v.len)
- reset ();
- else
+ if (inbuf_len >= 2)
{
- if (v.len)
+ int pkt_len = (inbuf [0] << 8) | inbuf [1];
+
+ if (inbuf_len >= 2 + pkt_len)
+ return 2 + pkt_len;
+
+ if (inbuf_len == sizeof (inbuf))
{
- memcpy (cur, v.ptr, v.len);
- cur += v.len;
+ send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
+ destroy ();
+ return -1;
}
}
- return *this;
+ return 0;
}
-packet &packet::operator <<(const data8 &v)
+void
+client::skip_packet (int len)
{
- unsigned int len = min (v.len, 0x00FF);
- return *this << uint8 (len) << data (v.ptr, len);
+ inbuf_len -= len;
+ memmove (inbuf, inbuf + len, inbuf_len);
}
-packet &packet::operator <<(const data16 &v)
+/*****************************************************************************
+ * Start of command dispatch area.
+ * The commands here are protocol commands.
+ ****************************************************************************/
+
+// SocketCommand, PlayingCommand, should not exist with those ugly casts
+#define SC(cb) (void *)static_cast(cb),
+#define PC(cb) (void *)static_cast(cb), PF_PLAYER |
+
+static void
+NopCmd (char *, int, client *)
{
- unsigned int len = min (v.len, 0xFFFF);
- return *this << uint16 (len) << data (v.ptr, len);
+ // do nothing
}
-packet &packet::operator <<(const char *v)
+/**
+ * Dispatch table for the server.
+ */
+static struct packet_type packets[] = {
+ {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
+ {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
+
+ {"examine", PC(ExamineCmd) PF_PLAYING },
+ {"ex", PC(ExCmd) PF_PLAYING },
+ {"apply", PC(ApplyCmd) PF_PLAYING },
+ {"lookat", PC(LookAt) PF_PLAYING },
+ {"lock", PC(LockItem) PF_PLAYING },
+ {"mark", PC(MarkItem) PF_PLAYING },
+ {"move", PC(MoveCmd) PF_PLAYING },
+ {"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
+ {"mapredraw", PC(MapRedrawCmd) 0 },
+ {"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
+
+ {"reply", SC(ReplyCmd) 0 },
+ {"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
+ {"addme", SC(AddMeCmd) 0 },
+ {"askface", SC(AskFaceCmd) 0 },
+ {"requestinfo", SC(RequestInfo) 0 },
+ {"setsound", SC(SetSound) 0 },
+ {"setup", SC(SetUp) 0 },
+ {"version", SC(VersionCmd) 0 },
+
+ {"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
+};
+
+bool
+client::may_execute (const packet_type *pkt) const
+{
+ return (!(pkt->flags & PF_PLAYER) || pl)
+ && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
+}
+
+// HACK: some commands currently should be executed
+// even when the player is frozen. this hack detects
+// those commands. it should be folded into may_execute,
+// but kept seperate to emphasise the hack aspect, i.e.
+// do it better, then remove.
+static bool
+always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
{
- return *this << data (v, strlen (v ? v : 0));
+ if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
+ return false;
+
+ if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
+ return false;
+
+ if (pkt->flags & PF_COMMAND6)
+ {
+ data += 6;
+ len -= 6;
+ }
+
+ if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
+ if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
+ if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
+ if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
+ if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
+
+ if (len == 7 && !strcmp (data, "suicide")) return true;
+
+ return false;
}
void
-packet::printf (const char *format, ...)
+client::execute (const packet_type *pkt, char *data, int datalen)
{
- int size = room ();
+ if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
+ {
+ //TODO: only one format
+ if (pkt->flags & PF_PLAYER)
+ {
+ ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
+ pl->need_updated_stats ();
+ }
+ else
+ ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
+ }
+ else
+ send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
+}
- va_list ap;
- va_start (ap, format);
- int len = vsnprintf ((char *)cur, size, format, ap);
- va_end (ap);
+bool
+client::handle_packet ()
+{
+ int pkt_len = next_packet ();
- if (len >= size)
- return reset ();
+ if (!pkt_len)
+ return false;
+ else if (pkt_len < 0)
+ {
+ LOG (llevError, "read error on player %s\n",
+ pl && pl->ob ? &pl->ob->name : "[anonymous]");
+ destroy ();
+ return false;
+ }
- cur += len;
+ uint8_t save_byte = inbuf [pkt_len]; // rather ugly
+ inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
+
+ /* First, break out beginning word. There are at least
+ * a few commands that do not have any paremeters. If
+ * we get such a command, don't worry about trying
+ * to break it up.
+ */
+ int datalen;
+ char *data = strchr ((char *)inbuf + 2, ' ');
+
+ if (data)
+ {
+ *data++ = 0;
+ datalen = pkt_len - (data - (char *)inbuf);
+ }
+ else
+ {
+ data = (char *)inbuf + 2; // better read garbage than segfault
+ datalen = 0;
+ }
+
+ for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
+ if (!strcmp ((char *)inbuf + 2, pkt->name))
+ {
+ if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
+ queue_command (pkt, data, datalen);
+ else
+ execute (pkt, data, datalen);
+
+ goto next_packet;
+ }
+
+ // If we get here, we didn't find a valid command.
+ send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
+
+next_packet:
+ inbuf [pkt_len] = save_byte; // rather ugly
+ skip_packet (pkt_len);
+
+ // input buffer has space again
+ socket_ev.poll (socket_ev.poll () | EV_READ);
+
+ return true;
}
-/******************************************************************************
- *
- * Start of read routines.
- *
- ******************************************************************************/
+void
+client::inbuf_handle ()
+{
+ if (!handle_packet ())
+ return;
-int
-client::read_packet ()
+ while (handle_packet ())
+ ;
+
+ flush ();
+}
+
+// callback called when socket is either readable or writable
+void
+client::socket_cb (iow &w, int revents)
{
- for (;;)
+ //TODO remove when we have better socket cleanup logic
+ if (destroyed ())
{
- if (inbuf_len >= 2)
- {
- unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
+ socket_ev.poll (0);
+ return;
+ }
- if (inbuf_len >= 2 + pkt_len)
- return pkt_len + 2;
- }
+ if (revents & EV_WRITE)
+ {
+ write_outputbuffer ();
+
+ if (!outputbuffer.len)
+ socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
+ }
+
+ if (revents & EV_READ)
+ {
+ //TODO: rate-limit tcp connection in better ways, important
int amount = sizeof (inbuf) - inbuf_len;
- if (amount <= 0)
+ if (!amount)
{
- LOG (llevError, "packet too large");//TODO
- return -1;
+ // input buffer full
+ LOG (llevError, "input buffer overflow.");
+ destroy ();
+ return;
}
- amount = read (fd, inbuf + inbuf_len, amount);
+ if (ws_version)
+ {
+ if (ws_inbuf_len + 4096 > ws_inbuf_alloc)
+ ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
+
+ int len = read (fd, ws_inbuf + ws_inbuf_len, ws_inbuf_alloc - ws_inbuf_len);
+
+ if (len > 0)
+ {
+ ws_inbuf_len += len;
+
+ if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
+ return;
+
+ int d = 2;
+ int o = ws_inbuf [0] & 15;
+ int l = ws_inbuf [1] & 127;
+
+ if (l == 126)
+ {
+ l = (ws_inbuf [2] << 8) | ws_inbuf [3];
+ d += 2;
+ }
+ else if (l == 127)
+ {
+ if (ws_inbuf_len < 2 + 8)
+ return;
+
+ // we don't do extra long frames, if a browser wants to send >2**32 bytes,
+ // there are bigger issues to fix.
+ l = (ws_inbuf [6] << 24)
+ | (ws_inbuf [7] << 16)
+ | (ws_inbuf [8] << 8)
+ | ws_inbuf [9];
+ d += 8;
+ }
+
+ // we only continue if we have a complete frame
+ if (ws_inbuf_len < d + 4 + l)
+ return;
+
+ switch (o)
+ {
+ case 0: o = ws_inbuf_type; break; // continuation
+ case 1: ws_inbuf_type = 1; break; // utf-8
+ case 2: ws_inbuf_type = 2; break; // binary
+ }
+
+ if (l > amount)
+ {
+ // input buffer full
+ LOG (llevError, "input buffer overflow (ws).");
+ destroy ();
+ return;
+ }
+
+ for (int i = 0; i < l; ++i)
+ inbuf [inbuf_len + i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
+
+ // remove frame
+ ws_inbuf_len -= d + 4 + l;
+ memmove (ws_inbuf, ws_inbuf + d + 4 + l, ws_inbuf_len);
+
+ switch (o)
+ {
+ case 1: // utf-8
+ //TODO
+ break;
+ case 2: // binary
+ break;
+
+ case 9: // ping
+ {
+ // send pong - we assume ping messages are <64k
+ // as we can't handle >10k at the moment anyway.
+ uint8 hdr [] = { 0x8a, 126, l >> 8, l };
+ send (hdr, sizeof (hdr));
+ send (inbuf + inbuf_len, l);
+ }
+ return;
+
+ case 10: // pong
+ return;
+
+ case 8: // close
+ default:
+ destroy ();
+ return;
+ }
+
+ amount = l;
+ }
+ else
+ amount = -1;
+ }
+ else
+ amount = read (fd, inbuf + inbuf_len, amount);
if (!amount)
{
- status = Ns_Dead;
- return -1;
+ destroy ();
+ return;
}
else if (amount < 0)
{
if (errno != EAGAIN && errno != EINTR)
{
LOG (llevError, "read error: %s\n", strerror (errno));
- return -1;
+ destroy ();
+ return;
}
- return 0;
+ // should not be here, normally
+ }
+ else
+ {
+ inbuf_len += amount;
+ inbuf_handle ();
}
-
- inbuf_len += amount;
-
- cst_tot.ibytes += amount;
- cst_lst.ibytes += amount;
}
}
-void
-client::skip_packet (int len)
-{
- inbuf_len -= len;
- memmove (inbuf, inbuf + len, inbuf_len);
-}
-
/*******************************************************************************
*
* Start of write related routines.
@@ -268,19 +495,16 @@
client::send (void *buf_, int len)
{
char *buf = (char *)buf_;
- char *pos = buf;
- int amt = 0;
- if (status == Ns_Dead || !buf)
- {
- LOG (llevDebug, "Write_To_Socket called with dead socket\n");
- return;
- }
+ if (destroyed () || !buf)
+ return;
- if ((len + outputbuffer.len) > SOCKETBUFSIZE)
+ if (len + outputbuffer.len > SOCKETBUFSIZE)
{
- LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd);
- status = Ns_Dead;
+ LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
+ // shutdown the socket, this is safer than destroying it immediately
+ // as lots of code in the callchain might still access the map etc.
+ shutdown (fd, SHUT_RDWR);
return;
}
@@ -308,15 +532,6 @@
outputbuffer.len += len;
}
-void
-client::socket_cb (iow &w, int got)
-{
- write_outputbuffer ();
-
- if (!outputbuffer.len)
- socket_ev.poll (socket_ev.poll () & ~PE_W);
-}
-
/**
* Takes a string of data, and writes it out to the socket. A very handy
* shortcut function.
@@ -324,10 +539,10 @@
void
client::send_packet (packet &sl)
{
- if (status == Ns_Dead)
+ if (destroyed ())
return;
- if (sl.length () >= MAXSOCKBUF)
+ if (sl.length () > MAXSOCKBUF)
{
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
/* Almost certainly we've overflowed a buffer, so quit now to make
@@ -339,12 +554,28 @@
if (!sl.length ())
return;
- assert (sl.hdrlen == 2);
+ if (ws_version == 8)
+ {
+ uint8 hdr [4] = { 0x81, 126, sl.length () >> 8, sl.length () };
+ // TODO: utf-8 encoding
+ send (hdr, 4);
+ send (sl.buf_ + sl.hdrlen, sl.cur - sl.buf_ - sl.hdrlen);
+ }
+ else if (ws_version == 13)
+ {
+ uint8 hdr [4] = { 0x82, 126, sl.length () >> 8, sl.length () };
+ send (hdr, 4);
+ send (sl.buf_ + sl.hdrlen, sl.cur - sl.buf_ - sl.hdrlen);
+ }
+ else
+ {
+ assert (sl.hdrlen == 2);
- sl.buf_ [0] = sl.length () >> 8;
- sl.buf_ [1] = sl.length () ;
+ sl.buf_ [0] = sl.length () >> 8;
+ sl.buf_ [1] = sl.length () ;
- send (sl.buf_, sl.length () + sl.hdrlen);
+ send (sl.buf_, sl.length () + sl.hdrlen);
+ }
}
void
@@ -362,38 +593,120 @@
send_packet (buf, strlen (buf));
}
-/******************************************************************************
+void
+client::send_packet_printf (const char *format, ...)
+{
+ packet sl;
+
+ va_list ap;
+ va_start (ap, format);
+ sl.vprintf (format, ap);
+ va_end (ap);
+
+ send_packet (sl);
+}
+
+void
+client::send_msg (int color, const char *type, const char *msg)
+{
+ if (!msg || !type) // it can happen (for example, missing attack messages cause this)
+ {
+ LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
+ return;
+ }
+
+ int len = strlen (msg);
+
+ if (!(color & NDI_VERBATIM)
+ && (msg_is_special (msg)
+ || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
+ cfperl_send_msg (this, color, type, msg);
+ else
+ send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
+}
+
+void
+client::send_drawinfo (const char *msg, int flags)
+{
+ send_msg (flags, "log", msg);
+}
+
+/***********************************************************************
*
- * statistics logging functions.
+ * packet functions/utilities
*
- ******************************************************************************/
+ **********************************************************************/
+
+packet::packet (const char *name)
+{
+ reset ();
-#ifdef CS_LOGSTATS
+ int len = strlen (name);
+ memcpy (cur, name, len); cur += len;
+ *cur++ = ' ';
+}
-/* cst_tot is for the life of the server, cst_last is for the last series of
- * stats
- */
-CS_Stats cst_tot, cst_lst;
+packet &packet::operator <<(const ber32 v)
+{
+ enum { maxlen = 32 / 7 + 1 };
+ uint8 buf[maxlen];
+ uint8 *p = buf + maxlen;
+ uint32 val = v.val;
+
+ *--p = val & 0x7F;
+
+ while (val > 0x7F)
+ {
+ val >>= 7;
+ *--p = (val & 0x7F) | 0x80;
+ }
+
+ return *this << data (p, buf + maxlen - p);
+}
+
+packet &packet::operator <<(const data &v)
+{
+ if (room () < v.len)
+ reset ();
+ else
+ {
+ if (v.len)
+ {
+ memcpy (cur, v.ptr, v.len);
+ cur += v.len;
+ }
+ }
+
+ return *this;
+}
+
+packet &packet::operator <<(const data8 &v)
+{
+ unsigned int len = min (v.len, 0x00FF);
+ return *this << uint8 (len) << data (v.ptr, len);
+}
+
+packet &packet::operator <<(const data16 &v)
+{
+ unsigned int len = min (v.len, 0xFFFF);
+ return *this << uint16 (len) << data (v.ptr, len);
+}
+
+packet &packet::operator <<(const char *v)
+{
+ return *this << data (v, strlen (v ? v : 0));
+}
-/**
- * Writes out the gathered stats. We clear cst_lst.
- */
void
-write_cs_stats (void)
+packet::vprintf (const char *format, va_list ap)
{
- time_t now = time (NULL);
+ int size = room ();
- /* If no connections recently, don't both to log anything */
- if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
- return;
+ int len = vsnprintf ((char *)cur, size, format, ap);
- /* CSSTAT is put in so scripts can easily find the line */
- LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
- ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
- now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
- cst_lst.ibytes = 0;
- cst_lst.obytes = 0;
- cst_lst.time_start = now;
+ if (len >= size)
+ return reset ();
+
+ cur += len;
}
-#endif