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[amule.git] / src / libs / ec / cpp / ECSocket.cpp
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1 //
2 // This file is part of the aMule Project.
3 //
4 // Copyright (c) 2004-2008 aMule Team ( admin@amule.org / http://www.amule.org )
5 // Copyright (c) 2004-2008 Angel Vidal ( kry@amule.org )
6 //
7 // Any parts of this program derived from the xMule, lMule or eMule project,
8 // or contributed by third-party developers are copyrighted by their
9 // respective authors.
10 //
11 // This program is free software; you can redistribute it and/or modify
12 // it under the terms of the GNU General Public License as published by
13 // the Free Software Foundation; either version 2 of the License, or
14 // (at your option) any later version.
15 //
16 // This program is distributed in the hope that it will be useful,
17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 // GNU General Public License for more details.
20 //
21 // You should have received a copy of the GNU General Public License
22 // along with this program; if not, write to the Free Software
23 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
24 //
25
26 #include "ECSocket.h"
27
28 #include <sstream>
29 #include <iostream>
30 #include <algorithm>
31
32 using namespace std;
33
34 #include "ECPacket.h" // Needed for CECPacket
35
36 #define EC_COMPRESSION_LEVEL Z_BEST_COMPRESSION
37 #define EC_MAX_UNCOMPRESSED 1024
38
39 #ifndef __GNUC__
40 #define __attribute__(x)
41 #endif
42
43 // If your compiler gives errors on these lines, just remove them.
44 int utf8_mbtowc(wchar_t *p, const unsigned char *s, int n) __attribute__((__visibility__("internal")));
45 int utf8_wctomb(unsigned char *s, wchar_t wc, int maxlen) __attribute__((__visibility__("internal")));
46 int utf8_mb_remain(char c) __attribute__((__pure__));
47
48 /*----------=> Import from the Linux kernel <=----------*/
49 /*
50 * linux/fs/nls_base.c
51 */
52
53 /*
54 * Sample implementation from Unicode home page.
55 * http://www.stonehand.com/unicode/standard/fss-utf.html
56 */
57 struct utf8_table {
58 int cmask;
59 int cval;
60 int shift;
61 uint32_t lmask;
62 uint32_t lval;
63 };
64
65 static struct utf8_table utf8_table[] =
66 {
67 {0x80, 0x00, 0*6, 0x7F, 0, /* 1 byte sequence */},
68 {0xE0, 0xC0, 1*6, 0x7FF, 0x80, /* 2 byte sequence */},
69 {0xF0, 0xE0, 2*6, 0xFFFF, 0x800, /* 3 byte sequence */},
70 {0xF8, 0xF0, 3*6, 0x1FFFFF, 0x10000, /* 4 byte sequence */},
71 {0xFC, 0xF8, 4*6, 0x3FFFFFF, 0x200000, /* 5 byte sequence */},
72 {0xFE, 0xFC, 5*6, 0x7FFFFFFF, 0x4000000, /* 6 byte sequence */},
73 {0, 0, 0, 0, 0, /* end of table */}
74 };
75
76 int utf8_mbtowc(uint32_t *p, const unsigned char *s, int n)
77 {
78 uint32_t l;
79 int c0, c, nc;
80 struct utf8_table *t;
81
82 nc = 0;
83 c0 = *s;
84 l = c0;
85 for (t = utf8_table; t->cmask; t++) {
86 nc++;
87 if ((c0 & t->cmask) == t->cval) {
88 l &= t->lmask;
89 if (l < t->lval)
90 return -1;
91 *p = l;
92 return nc;
93 }
94 if (n <= nc)
95 return -1;
96 s++;
97 c = (*s ^ 0x80) & 0xFF;
98 if (c & 0xC0)
99 return -1;
100 l = (l << 6) | c;
101 }
102 return -1;
103 }
104
105 int utf8_wctomb(unsigned char *s, uint32_t wc, int maxlen)
106 {
107 uint32_t l;
108 int c, nc;
109 struct utf8_table *t;
110
111 l = wc;
112 nc = 0;
113 for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
114 nc++;
115 if (l <= t->lmask) {
116 c = t->shift;
117 *s = t->cval | (l >> c);
118 while (c > 0) {
119 c -= 6;
120 s++;
121 *s = 0x80 | ((l >> c) & 0x3F);
122 }
123 return nc;
124 }
125 }
126 return -1;
127 }
128 /*----------=> End of Import <=----------*/
129
130 int utf8_mb_remain(char c)
131 {
132 int i;
133 for (i = 0; i < 5; ++i) {
134 if ((c & utf8_table[i].cmask) == utf8_table[i].cval) break;
135 }
136 return i;
137 }
138
139
140 void CQueuedData::Write(const void *data, size_t len)
141 {
142 const size_t canWrite = std::min(GetRemLength(), len);
143 wxASSERT(len == canWrite);
144
145 memcpy(m_wr_ptr, data, canWrite);
146 m_wr_ptr += canWrite;
147 }
148
149
150 void CQueuedData::WriteAt(const void *data, size_t len, size_t offset)
151 {
152 wxASSERT(len + offset <= m_data.size());
153 if (offset > m_data.size()) {
154 return;
155 } else if (offset + len > m_data.size()) {
156 len = m_data.size() - offset;
157 }
158
159 memcpy(&m_data[0] + offset, data, len);
160 }
161
162
163 void CQueuedData::Read(void *data, size_t len)
164 {
165 const size_t canRead = std::min(GetUnreadDataLength(), len);
166 wxASSERT(len == canRead);
167
168 memcpy(data, m_rd_ptr, canRead);
169 m_rd_ptr += canRead;
170 }
171
172
173 void CQueuedData::WriteToSocket(CECSocket *sock)
174 {
175 wxCHECK_RET(m_rd_ptr < m_wr_ptr,
176 wxT("Reading past written data in WriteToSocket"));
177
178 sock->SocketWrite(m_rd_ptr, GetUnreadDataLength());
179 m_rd_ptr += sock->GetLastCount();
180 }
181
182
183 void CQueuedData::ReadFromSocket(CECSocket *sock, size_t len)
184 {
185 const size_t canWrite = std::min(GetRemLength(), len);
186 wxASSERT(len == canWrite);
187
188 sock->SocketRead(m_wr_ptr, canWrite);
189 m_wr_ptr += sock->GetLastCount();
190 }
191
192
193 size_t CQueuedData::ReadFromSocketAll(CECSocket *sock, size_t len)
194 {
195 size_t read_rem = std::min(GetRemLength(), len);
196 wxASSERT(read_rem == len);
197
198 // We get here when socket is truly blocking
199 do {
200 // Give socket a 10 sec chance to recv more data.
201 if ( !sock->WaitSocketRead(10, 0) ) {
202 break;
203 }
204
205 wxASSERT(m_wr_ptr + read_rem <= &m_data[0] + m_data.size());
206 sock->SocketRead(m_wr_ptr, read_rem);
207 m_wr_ptr += sock->GetLastCount();
208 read_rem -= sock->GetLastCount();
209
210 if (sock->SocketError() && !sock->WouldBlock()) {
211 break;
212 }
213 } while (read_rem);
214
215 return len - read_rem;
216 }
217
218
219 size_t CQueuedData::GetLength() const
220 {
221 return m_data.size();
222 }
223
224
225 size_t CQueuedData::GetDataLength() const
226 {
227 const size_t len = m_wr_ptr - &m_data[0];
228 wxCHECK_MSG(len <= m_data.size(), m_data.size(),
229 wxT("Write-pointer past end of buffer"));
230
231 return len;
232 }
233
234
235 size_t CQueuedData::GetRemLength() const
236 {
237 return m_data.size() - GetDataLength();
238 }
239
240
241 size_t CQueuedData::GetUnreadDataLength() const
242 {
243 wxCHECK_MSG(m_wr_ptr >= m_rd_ptr, 0,
244 wxT("Read position past write position."));
245
246 return m_wr_ptr - m_rd_ptr;
247 }
248
249
250
251 //
252 // CECSocket API - User interface functions
253 //
254
255 CECSocket::CECSocket(bool use_events)
256 :
257 m_use_events(use_events),
258 m_output_queue(),
259 m_in_ptr(EC_SOCKET_BUFFER_SIZE),
260 m_out_ptr(EC_SOCKET_BUFFER_SIZE),
261 m_curr_rx_data(new CQueuedData(EC_SOCKET_BUFFER_SIZE)),
262 m_curr_tx_data(new CQueuedData(EC_SOCKET_BUFFER_SIZE)),
263 m_rx_flags(0),
264 m_tx_flags(0),
265 m_my_flags(0x20 | EC_FLAG_ZLIB | EC_FLAG_UTF8_NUMBERS | EC_FLAG_ACCEPTS),
266 // setup initial state: 4 flags + 4 length
267 m_bytes_needed(8),
268 m_in_header(true)
269 {
270
271 }
272
273 bool CECSocket::HaveNotificationSupport()
274 {
275 return (m_rx_flags & EC_FLAG_NOTIFY) != 0;
276 }
277
278 CECSocket::~CECSocket()
279 {
280 while (!m_output_queue.empty()) {
281 CQueuedData *data = m_output_queue.front();
282 m_output_queue.pop_front();
283 delete data;
284 }
285 }
286
287 bool CECSocket::ConnectSocket(uint32_t ip, uint16_t port)
288 {
289 bool res;
290 #if wxCHECK_VERSION(2, 8, 8)
291 res = InternalConnect(ip, port, !m_use_events);
292 #else
293 res = InternalConnect(ip, port, false);
294 if ( !m_use_events ) {
295 res = WaitSocketConnect(10, 0) && InternalIsConnected();
296 if ( res ) {
297 OnConnect();
298 } else {
299 OnLost();
300 }
301 }
302 #endif
303 return !SocketError() && res;
304 }
305
306 void CECSocket::SendPacket(const CECPacket *packet)
307 {
308 packet->DebugPrint(false);
309 WritePacket(packet);
310 OnOutput();
311 }
312
313 const CECPacket *CECSocket::SendRecvPacket(const CECPacket *packet)
314 {
315 SendPacket(packet);
316 m_curr_rx_data->ReadFromSocketAll(this, 2 * sizeof(uint32_t));
317 if (SocketError() && !WouldBlock()) {
318 OnError();
319 return 0;
320 }
321
322 m_curr_rx_data->Read(&m_rx_flags, sizeof(m_rx_flags));
323 m_rx_flags = ENDIAN_NTOHL(m_rx_flags);
324 m_curr_rx_data->Read(&m_curr_packet_len, sizeof(m_curr_packet_len));
325 m_curr_packet_len = ENDIAN_NTOHL(m_curr_packet_len);
326
327 if ( m_curr_rx_data->GetLength() < (m_curr_packet_len+2*sizeof(uint32_t)) ) {
328 m_curr_rx_data.reset(new CQueuedData(m_curr_packet_len));
329 }
330 m_curr_rx_data->ReadFromSocketAll(this, m_curr_packet_len);
331 if (SocketError() && !WouldBlock()) {
332 OnError();
333 return 0;
334 }
335 const CECPacket *reply = ReadPacket();
336 m_curr_rx_data->Rewind();
337 return reply;
338 }
339
340 std::string CECSocket::GetLastErrorMsg()
341 {
342 int code = InternalGetLastError();
343 switch(code) {
344 case EC_ERROR_NOERROR:
345 return "No error happened";
346 case EC_ERROR_INVOP:
347 return "Invalid operation";
348 case EC_ERROR_IOERR:
349 return "Input/Output error";
350 case EC_ERROR_INVADDR:
351 return "Invalid address passed to wxSocket";
352 case EC_ERROR_INVSOCK:
353 return "Invalid socket (uninitialized)";
354 case EC_ERROR_NOHOST:
355 return "No corresponding host";
356 case EC_ERROR_INVPORT:
357 return "Invalid port";
358 case EC_ERROR_WOULDBLOCK:
359 return "The socket is non-blocking and the operation would block";
360 case EC_ERROR_TIMEDOUT:
361 return "The timeout for this operation expired";
362 case EC_ERROR_MEMERR:
363 return "Memory exhausted";
364 }
365 ostringstream error_string;
366 error_string << "Error code " << code << " unknown.";
367 return error_string.str();
368 }
369
370 void CECSocket::OnError()
371 {
372 #ifdef __DEBUG__
373 cout << GetLastErrorMsg() << endl;
374 #endif
375 }
376
377 void CECSocket::OnLost()
378 {
379 }
380
381 //
382 // Event handlers
383 //
384 void CECSocket::OnConnect()
385 {
386 }
387
388 void CECSocket::OnInput()
389 {
390 size_t bytes_rx = 0;
391 do {
392 if (m_curr_rx_data.get()) {
393 m_curr_rx_data->ReadFromSocket(this, m_bytes_needed);
394 } else {
395 return;
396 }
397 if (SocketError() && !WouldBlock()) {
398 OnError();
399 // socket already disconnected in this point
400 m_curr_rx_data.reset(0);
401 return;
402 }
403 bytes_rx = GetLastCount();
404 m_bytes_needed -= bytes_rx;
405 } while (m_bytes_needed && bytes_rx);
406
407 if (!m_bytes_needed) {
408 if (m_in_header) {
409 m_in_header = false;
410 m_curr_rx_data->Read(&m_rx_flags, sizeof(m_rx_flags));
411 m_rx_flags = ENDIAN_NTOHL(m_rx_flags);
412 if (m_rx_flags & EC_FLAG_ACCEPTS) {
413 // Client sends its capabilities, update the internal mask.
414 m_curr_rx_data->Read(&m_my_flags, sizeof(m_my_flags));
415 m_my_flags = ENDIAN_NTOHL(m_my_flags);
416 //printf("Reading accepts mask: %x\n", m_my_flags);
417 wxASSERT(m_my_flags & 0x20);
418 // There has to be 4 more bytes. THERE HAS TO BE, DAMN IT.
419 m_curr_rx_data->ReadFromSocketAll(this, sizeof(m_curr_packet_len));
420 }
421 m_curr_rx_data->Read(&m_curr_packet_len, sizeof(m_curr_packet_len));
422 m_curr_packet_len = ENDIAN_NTOHL(m_curr_packet_len);
423 m_bytes_needed = m_curr_packet_len;
424 // packet bigger that 16Mb looks more like broken request
425 if (m_bytes_needed > 16*1024*1024) {
426 CloseSocket();
427 return;
428 }
429 size_t needed_size = m_bytes_needed + ((m_rx_flags & EC_FLAG_ACCEPTS) ? 12 : 8);
430 if (!m_curr_rx_data.get() ||
431 m_curr_rx_data->GetLength() < needed_size) {
432 m_curr_rx_data.reset(new CQueuedData(needed_size));
433 }
434 //#warning Kry TODO: Read packet?
435 } else {
436 //m_curr_rx_data->DumpMem();
437 std::auto_ptr<const CECPacket> packet(ReadPacket());
438 m_curr_rx_data->Rewind();
439 if (packet.get()) {
440 std::auto_ptr<const CECPacket> reply(OnPacketReceived(packet.get()));
441 if (reply.get()) {
442 SendPacket(reply.get());
443 }
444 }
445 m_bytes_needed = 8;
446 m_in_header = true;
447 }
448 }
449 }
450
451 void CECSocket::OnOutput()
452 {
453 while (!m_output_queue.empty()) {
454 CQueuedData* data = m_output_queue.front();
455 data->WriteToSocket(this);
456 if (!data->GetUnreadDataLength()) {
457 m_output_queue.pop_front();
458 delete data;
459 }
460 if (SocketError()) {
461 if (WouldBlock()) {
462 if ( m_use_events ) {
463 return;
464 } else {
465 if ( !WaitSocketWrite(10, 0) ) {
466 if (WouldBlock()) {
467 continue;
468 } else {
469 OnError();
470 break;
471 }
472 }
473 }
474 } else {
475 OnError();
476 return;
477 }
478 }
479 }
480 //
481 // All outstanding data sent to socket
482 //
483 WriteDoneAndQueueEmpty();
484 }
485
486 bool CECSocket::DataPending()
487 {
488 return !m_output_queue.empty();
489 }
490
491 //
492 // Socket I/O
493 //
494
495 size_t CECSocket::ReadBufferFromSocket(void *buffer, size_t required_len)
496 {
497 wxASSERT(required_len);
498
499 if (m_curr_rx_data->GetUnreadDataLength() < required_len) {
500 // need more data that we have. Looks like nothing will help here
501 return 0;
502 }
503 m_curr_rx_data->Read(buffer, required_len);
504 return required_len;
505 }
506
507 void CECSocket::WriteBufferToSocket(const void *buffer, size_t len)
508 {
509 unsigned char *wr_ptr = (unsigned char *)buffer;
510 while ( len ) {
511 size_t curr_free = m_curr_tx_data->GetRemLength();
512 if ( len > curr_free ) {
513
514 m_curr_tx_data->Write(wr_ptr, curr_free);
515 len -= curr_free;
516 wr_ptr += curr_free;
517 m_output_queue.push_back(m_curr_tx_data.release());
518 m_curr_tx_data.reset(new CQueuedData(EC_SOCKET_BUFFER_SIZE));
519 } else {
520 m_curr_tx_data->Write(wr_ptr, len);
521 break;
522 }
523 }
524 }
525
526
527 //
528 // ZLib "error handler"
529 //
530
531 void ShowZError(int zerror, z_streamp strm)
532 {
533 const char *p = NULL;
534
535 switch (zerror) {
536 case Z_STREAM_END: p = "Z_STREAM_END"; break;
537 case Z_NEED_DICT: p = "Z_NEED_DICT"; break;
538 case Z_ERRNO: p = "Z_ERRNO"; break;
539 case Z_STREAM_ERROR: p = "Z_STREAM_ERROR"; break;
540 case Z_DATA_ERROR: p = "Z_DATA_ERROR"; break;
541 case Z_MEM_ERROR: p = "Z_MEM_ERROR"; break;
542 case Z_BUF_ERROR: p = "Z_BUF_ERROR"; break;
543 case Z_VERSION_ERROR: p = "Z_VERSION_ERROR"; break;
544 }
545 printf("ZLib operation returned %s\n", p);
546 printf("ZLib error message: %s\n", strm->msg);
547 printf("zstream state:\n\tnext_in=%p\n\tavail_in=%u\n\ttotal_in=%lu\n\tnext_out=%p\n\tavail_out=%u\n\ttotal_out=%lu\n",
548 strm->next_in, strm->avail_in, strm->total_in, strm->next_out, strm->avail_out, strm->total_out);
549 }
550
551
552 bool CECSocket::ReadNumber(void *buffer, size_t len)
553 {
554 if (m_rx_flags & EC_FLAG_UTF8_NUMBERS) {
555 unsigned char mb[6];
556 uint32_t wc;
557 if (!ReadBuffer(mb, 1)) return false;
558 int remains = utf8_mb_remain(mb[0]);
559 if (remains) if (!ReadBuffer(&(mb[1]), remains)) return false;
560 if (utf8_mbtowc(&wc, mb, 6) == -1) return false; // Invalid UTF-8 code sequence
561 switch (len) {
562 case 1: PokeUInt8( buffer, wc ); break;
563 case 2: RawPokeUInt16( buffer, wc ); break;
564 case 4: RawPokeUInt32( buffer, wc ); break;
565 }
566 } else {
567 if ( !ReadBuffer(buffer, len) ) {
568 return false;
569 }
570 switch (len) {
571 case 2:
572 RawPokeUInt16( buffer, ENDIAN_NTOHS( RawPeekUInt16( buffer ) ) );
573 break;
574 case 4:
575 RawPokeUInt32( buffer, ENDIAN_NTOHL( RawPeekUInt32( buffer ) ) );
576 break;
577 }
578 }
579 return true;
580 }
581
582 bool CECSocket::WriteNumber(const void *buffer, size_t len)
583 {
584 if (m_tx_flags & EC_FLAG_UTF8_NUMBERS) {
585 unsigned char mb[6];
586 uint32_t wc = 0;
587 int mb_len;
588 switch (len) {
589 case 1: wc = PeekUInt8( buffer ); break;
590 case 2: wc = RawPeekUInt16( buffer ); break;
591 case 4: wc = RawPeekUInt32( buffer ); break;
592 default: return false;
593 }
594 if ((mb_len = utf8_wctomb(mb, wc, 6)) == -1) return false; // Something is terribly wrong...
595 return WriteBuffer(mb, mb_len);
596 } else {
597 char tmp[8];
598
599 switch (len) {
600 case 1: PokeUInt8( tmp, PeekUInt8( buffer ) ); break;
601 case 2: RawPokeUInt16( tmp, ENDIAN_NTOHS( RawPeekUInt16( buffer ) ) ); break;
602 case 4: RawPokeUInt32( tmp, ENDIAN_NTOHL( RawPeekUInt32( buffer ) ) ); break;
603 }
604 return WriteBuffer(tmp, len);
605 }
606 }
607
608 bool CECSocket::ReadBuffer(void *buffer, size_t len)
609 {
610 if (m_rx_flags & EC_FLAG_ZLIB) {
611 if ( !m_z.avail_in ) {
612 // no reason for this situation: all packet should be
613 // buffered by now
614 return false;
615 }
616 m_z.avail_out = (uInt)len;
617 m_z.next_out = (Bytef*)buffer;
618 int zerror = inflate(&m_z, Z_SYNC_FLUSH);
619 if ((zerror != Z_OK) && (zerror != Z_STREAM_END)) {
620 ShowZError(zerror, &m_z);
621 return false;
622 }
623 return true;
624 } else {
625 // using uncompressed buffered i/o
626 return ReadBufferFromSocket(buffer, len) == len;
627 }
628 }
629
630 bool CECSocket::WriteBuffer(const void *buffer, size_t len)
631 {
632 if (m_tx_flags & EC_FLAG_ZLIB) {
633
634 unsigned char *rd_ptr = (unsigned char *)buffer;
635 do {
636 unsigned int remain_in = EC_SOCKET_BUFFER_SIZE - m_z.avail_in;
637 if ( remain_in >= len ) {
638 memcpy(m_z.next_in+m_z.avail_in, rd_ptr, len);
639 m_z.avail_in += (uInt)len;
640 len = 0;
641 } else {
642 memcpy(m_z.next_in+m_z.avail_in, rd_ptr, remain_in);
643 m_z.avail_in += remain_in;
644 len -= remain_in;
645 rd_ptr += remain_in;
646 // buffer is full, calling zlib
647 do {
648 m_z.next_out = &m_out_ptr[0];
649 m_z.avail_out = EC_SOCKET_BUFFER_SIZE;
650 int zerror = deflate(&m_z, Z_NO_FLUSH);
651 if ( zerror != Z_OK ) {
652 ShowZError(zerror, &m_z);
653 return false;
654 }
655 WriteBufferToSocket(&m_out_ptr[0],
656 EC_SOCKET_BUFFER_SIZE - m_z.avail_out);
657 } while ( m_z.avail_out == 0 );
658 // all input should be used by now
659 wxASSERT(m_z.avail_in == 0);
660 m_z.next_in = &m_in_ptr[0];
661 }
662 } while ( len );
663 return true;
664 } else {
665 // using uncompressed buffered i/o
666 WriteBufferToSocket(buffer, len);
667 return true;
668 }
669 }
670
671 bool CECSocket::FlushBuffers()
672 {
673 if (m_tx_flags & EC_FLAG_ZLIB) {
674 do {
675 m_z.next_out = &m_out_ptr[0];
676 m_z.avail_out = EC_SOCKET_BUFFER_SIZE;
677 int zerror = deflate(&m_z, Z_FINISH);
678 if ( zerror == Z_STREAM_ERROR ) {
679 ShowZError(zerror, &m_z);
680 return false;
681 }
682 WriteBufferToSocket(&m_out_ptr[0],
683 EC_SOCKET_BUFFER_SIZE - m_z.avail_out);
684 } while ( m_z.avail_out == 0 );
685 }
686 if ( m_curr_tx_data->GetDataLength() ) {
687 m_output_queue.push_back(m_curr_tx_data.release());
688 m_curr_tx_data.reset(new CQueuedData(EC_SOCKET_BUFFER_SIZE));
689 }
690 return true;
691 }
692
693 //
694 // Packet I/O
695 //
696
697 void CECSocket::WritePacket(const CECPacket *packet)
698 {
699 if (SocketError() && !WouldBlock()) {
700 OnError();
701 return;
702 }
703
704 uint32_t flags = 0x20;
705
706 if ( packet->GetPacketLength() > EC_MAX_UNCOMPRESSED ) {
707 flags |= EC_FLAG_ZLIB;
708 } else {
709 flags |= EC_FLAG_UTF8_NUMBERS;
710 }
711
712 flags &= m_my_flags;
713 m_tx_flags = flags;
714
715 if (flags & EC_FLAG_ZLIB) {
716 m_z.zalloc = Z_NULL;
717 m_z.zfree = Z_NULL;
718 m_z.opaque = Z_NULL;
719 m_z.avail_in = 0;
720 m_z.next_in = &m_in_ptr[0];
721 int zerror = deflateInit(&m_z, EC_COMPRESSION_LEVEL);
722 if (zerror != Z_OK) {
723 // don't use zlib if init failed
724 flags &= ~EC_FLAG_ZLIB;
725 ShowZError(zerror, &m_z);
726 }
727 }
728
729 uint32_t tmp_flags = ENDIAN_HTONL(flags/* | EC_FLAG_ACCEPTS*/);
730 WriteBufferToSocket(&tmp_flags, sizeof(uint32));
731
732 /* uint32_t tmp_accepts_flags = ENDIAN_HTONL(m_my_flags);
733 WriteBufferToSocket(&tmp_accepts_flags, sizeof(uint32));*/
734
735 // preallocate 4 bytes in buffer for packet length
736 uint32_t packet_len = 0;
737 WriteBufferToSocket(&packet_len, sizeof(uint32));
738
739 packet->WritePacket(*this);
740
741 FlushBuffers();
742
743 // now calculate actual size of data
744 wxASSERT(m_curr_tx_data->GetDataLength() < 0xFFFFFFFF);
745 packet_len = (uint32_t)m_curr_tx_data->GetDataLength();
746 for(std::deque<CQueuedData*>::iterator i = m_output_queue.begin(); i != m_output_queue.end(); i++) {
747 wxASSERT(( packet_len + m_curr_tx_data->GetDataLength()) < 0xFFFFFFFF);
748 packet_len += (uint32_t)(*i)->GetDataLength();
749 }
750 // 4 flags and 4 length are not counted
751 packet_len -= 8;
752 // now write actual length @ offset 4
753 packet_len = ENDIAN_HTONL(packet_len);
754
755 CQueuedData *first_buff = m_output_queue.front();
756 if ( !first_buff ) first_buff = m_curr_tx_data.get();
757 first_buff->WriteAt(&packet_len, sizeof(uint32_t), sizeof(uint32_t));
758
759 if (flags & EC_FLAG_ZLIB) {
760 int zerror = deflateEnd(&m_z);
761 if ( zerror != Z_OK ) {
762 ShowZError(zerror, &m_z);
763 return;
764 }
765 }
766 }
767
768
769 const CECPacket *CECSocket::ReadPacket()
770 {
771 CECPacket *packet = 0;
772
773 uint32_t flags = m_rx_flags;
774
775 if ( ((flags & 0x60) != 0x20) || (flags & EC_FLAG_UNKNOWN_MASK) ) {
776 // Protocol error - other end might use an older protocol
777 cout << "ReadPacket: packet have invalid flags " << flags << endl;
778 CloseSocket();
779 return 0;
780 }
781
782 if (flags & EC_FLAG_ZLIB) {
783
784 m_z.zalloc = Z_NULL;
785 m_z.zfree = Z_NULL;
786 m_z.opaque = Z_NULL;
787 m_z.avail_in = 0;
788 m_z.next_in = 0;
789
790 int zerror = inflateInit(&m_z);
791 if (zerror != Z_OK) {
792 ShowZError(zerror, &m_z);
793 cout << "ReadPacket: failed zlib init" << endl;
794 CloseSocket();
795 return 0;
796 }
797 }
798
799 m_curr_rx_data->ToZlib(m_z);
800 packet = new CECPacket(*this);
801 packet->ReadFromSocket(*this);
802
803 if (packet->HasError()) {
804 cout << "ReadPacket: error in packet read" << endl;
805 delete packet;
806 packet = NULL;
807 CloseSocket();
808 }
809
810 if (flags & EC_FLAG_ZLIB) {
811 int zerror = inflateEnd(&m_z);
812 if ( zerror != Z_OK ) {
813 ShowZError(zerror, &m_z);
814 cout << "ReadPacket: failed zlib free" << endl;
815 CloseSocket();
816 }
817 }
818
819 return packet;
820 }
821
822 const CECPacket *CECSocket::OnPacketReceived(const CECPacket *)
823 {
824 return 0;
825 }
826 // File_checked_for_headers
aMule P2P client