2 Copied from PLIB into SimGear
4 PLIB - A Suite of Portable Game Libraries
5 Copyright (C) 1998,2002 Steve Baker
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public
18 License along with this library; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 For further information visit http://plib.sourceforge.net
23 $Id: NetChat.cxx 2117 2007-09-13 23:21:09Z fayjf $
26 #include <simgear/io/sg_netChat.hxx>
28 #include <cstring> // for strdup
34 NetChat::setTerminator (const char* t)
36 if (terminator) free(terminator);
37 terminator = strdup(t);
42 NetChat::getTerminator (void)
49 NetChat::setByteCount(int count)
51 if (terminator) free(terminator);
53 bytesToCollect = count;
56 // return the size of the largest prefix of needle at the end
59 #define MAX(a,b) (((a)>(b))?(a):(b))
62 find_prefix_at_end (const NetBuffer& haystack, const char* needle)
64 const char* hd = haystack.getData();
65 int hl = haystack.getLength();
66 int nl = strlen(needle);
68 for (int i = MAX (nl-hl, 0); i < nl; i++) {
69 //if (haystack.compare (needle, hl-(nl-i), nl-i) == 0) {
70 if (memcmp(needle, &hd[hl-(nl-i)], nl-i) == 0) {
78 find_terminator (const NetBuffer& haystack, const char* needle)
80 if (needle && *needle)
82 const char* data = haystack.getData();
83 const char* ptr = strstr(data,needle);
90 bool NetChat::push (const char* s)
92 return bufferSend ( s, strlen(s) ) ;
96 NetChat::handleBufferRead (NetBuffer& in_buffer)
98 // Continue to search for terminator in in_buffer,
99 // while calling collect_incoming_data. The while loop is
100 // necessary because we might read several data+terminator combos
101 // with a single recv().
103 while (in_buffer.getLength()) {
104 // special case where we're not using a terminator
105 if (terminator == 0 || *terminator == 0) {
106 if ( bytesToCollect > 0) {
107 const int toRead = std::min(in_buffer.getLength(), bytesToCollect);
108 collectIncomingData(in_buffer.getData(), toRead);
109 in_buffer.remove(0, toRead);
110 bytesToCollect -= toRead;
111 if (bytesToCollect == 0) { // read all requested bytes
114 } else { // read the whole lot
115 collectIncomingData (in_buffer.getData(),in_buffer.getLength());
122 int terminator_len = strlen(terminator);
124 int index = find_terminator ( in_buffer, terminator ) ;
127 // 1) end of buffer matches terminator exactly:
128 // collect data, transition
129 // 2) end of buffer matches some prefix:
130 // collect data to the prefix
131 // 3) end of buffer does not match any prefix:
135 // we found the terminator
136 collectIncomingData ( in_buffer.getData(), index ) ;
137 in_buffer.remove (0, index + terminator_len);
140 // check for a prefix of the terminator
141 int num = find_prefix_at_end (in_buffer, terminator);
143 int bl = in_buffer.getLength();
144 // we found a prefix, collect up to the prefix
145 collectIncomingData ( in_buffer.getData(), bl - num ) ;
146 in_buffer.remove (0, bl - num);
149 // no prefix, collect it all
150 collectIncomingData (in_buffer.getData(), in_buffer.getLength());
157 } // of namespace simgear