]> git.netwichtig.de Git - user/henk/code/inspircd.git/blob - src/hashcomp.cpp
f7a67b13a967a04e10aa72b240ccbe7eda0491c7
[user/henk/code/inspircd.git] / src / hashcomp.cpp
1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
6  *                     E-mail:
7  *              <brain@chatspike.net>
8  *              <Craig@chatspike.net>
9  *
10  * Written by Craig Edwards, Craig McLure, and others.
11  * This program is free but copyrighted software; see
12  *          the file COPYING for details.
13  *
14  * ---------------------------------------------------
15  */
16
17 using namespace std;
18
19 #include "inspircd.h"
20 #include "hashcomp.h"
21 #include <ext/hash_map>
22 #define nspace __gnu_cxx
23
24 /******************************************************
25  *
26  * The hash functions of InspIRCd are the centrepoint
27  * of the entire system. If these functions are
28  * inefficient or wasteful, the whole program suffers
29  * as a result. A lot of C programmers in the ircd
30  * scene spend a lot of time debating (arguing) about
31  * the best way to write hash functions to hash irc
32  * nicknames, channels etc.
33  * We are lucky as C++ developers as hash_map does
34  * a lot of this for us. It does intellegent memory
35  * requests, bucketing, search functions, insertion
36  * and deletion etc. All we have to do is write some
37  * overloaded comparison and hash value operators which
38  * cause it to act in an irc-like way. The features we
39  * add to the standard hash_map are:
40  *
41  * Case insensitivity: The hash_map will be case
42  * insensitive.
43  *
44  * Scandanavian Comparisons: The characters [, ], \ will
45  * be considered the lowercase of {, } and |.
46  *
47  * This file also contains hashing methods for hashing
48  * insp_inaddr structs, we use this if we want to cache IP
49  * addresses.
50  *
51  ******************************************************/
52
53 using namespace std;
54 using namespace irc::sockets;
55
56 /* convert a string to lowercase. Note following special circumstances
57  * taken from RFC 1459. Many "official" server branches still hold to this
58  * rule so i will too;
59  *
60  *  Because of IRC's scandanavian origin, the characters {}| are
61  *  considered to be the lower case equivalents of the characters []\,
62  *  respectively. This is a critical issue when determining the
63  *  equivalence of two nicknames.
64  */
65 void nspace::strlower(char *n)
66 {
67         if (n)
68         {
69                 for (char* t = n; *t; t++)
70                         *t = lowermap[(unsigned char)*t];
71         }
72 }
73
74 size_t nspace::hash<insp_inaddr>::operator()(const insp_inaddr &a) const
75 {
76         size_t q;
77         memcpy(&q,&a,sizeof(size_t));
78         return q;
79 }
80
81 size_t nspace::hash<string>::operator()(const string &s) const
82 {
83         /* XXX: NO DATA COPIES! :)
84          * The hash function here is practically
85          * a copy of the one in STL's hash_fun.h,
86          * only with *x replaced with lowermap[*x].
87          * This avoids a copy to use hash<const char*>
88          */
89         register size_t t = 0;
90         for (std::string::const_iterator x = s.begin(); x != s.end(); ++x) /* ++x not x++, as its faster */
91                 t = 5 * t + lowermap[(unsigned char)*x];
92         return t;
93 }
94
95 bool irc::StrHashComp::operator()(const std::string& s1, const std::string& s2) const
96 {
97         unsigned char* n1 = (unsigned char*)s1.c_str();
98         unsigned char* n2 = (unsigned char*)s2.c_str();
99         for (; *n1 && *n2; n1++, n2++)
100                 if (lowermap[*n1] != lowermap[*n2])
101                         return false;
102         return (lowermap[*n1] == lowermap[*n2]);
103 }
104
105 bool irc::InAddr_HashComp::operator()(const insp_inaddr &s1, const insp_inaddr &s2) const
106 {
107 #ifdef IPV6
108         for (int n = 0; n < 16; n++)
109                 if (s2.s6_addr[n] != s1.s6_addr[n])
110                         return false;
111         return true;
112 #else
113         return (s1.s_addr == s1.s_addr);
114 #endif
115 }
116
117 /******************************************************
118  *
119  * This is the implementation of our special irc::string
120  * class which is a case-insensitive equivalent to
121  * std::string which is not only case-insensitive but
122  * can also do scandanavian comparisons, e.g. { = [, etc.
123  *
124  * This class depends on the const array 'lowermap'.
125  *
126  ******************************************************/
127
128 bool irc::irc_char_traits::eq(char c1st, char c2nd)
129 {
130         return lowermap[(unsigned char)c1st] == lowermap[(unsigned char)c2nd];
131 }
132
133 bool irc::irc_char_traits::ne(char c1st, char c2nd)
134 {
135         return lowermap[(unsigned char)c1st] != lowermap[(unsigned char)c2nd];
136 }
137
138 bool irc::irc_char_traits::lt(char c1st, char c2nd)
139 {
140         return lowermap[(unsigned char)c1st] < lowermap[(unsigned char)c2nd];
141 }
142
143 int irc::irc_char_traits::compare(const char* str1, const char* str2, size_t n)
144 {
145         for(unsigned int i = 0; i < n; i++)
146         {
147                 if(lowermap[(unsigned char)*str1] > lowermap[(unsigned char)*str2])
148                         return 1;
149
150                 if(lowermap[(unsigned char)*str1] < lowermap[(unsigned char)*str2])
151                         return -1;
152
153                 if(*str1 == 0 || *str2 == 0)
154                         return 0;
155
156                 str1++;
157                 str2++;
158         }
159         return 0;
160 }
161
162 std::string operator+ (std::string& leftval, irc::string& rightval)
163 {
164         return leftval + std::string(rightval.c_str());
165 }
166
167 irc::string operator+ (irc::string& leftval, std::string& rightval)
168 {
169         return leftval + irc::string(rightval.c_str());
170 }
171
172 bool operator== (std::string& leftval, irc::string& rightval)
173 {
174         return (leftval == std::string(rightval.c_str()));
175 }
176
177 bool operator== (irc::string& leftval, std::string& rightval)
178 {
179         return (rightval == std::string(leftval.c_str()));
180 }
181
182 const char* irc::irc_char_traits::find(const char* s1, int  n, char c)
183 {
184         while(n-- > 0 && lowermap[(unsigned char)*s1] != lowermap[(unsigned char)c])
185                 s1++;
186         return s1;
187 }
188
189 /* See hashcomp.h if you care about these... */
190 std::ostream& operator<<(std::ostream &os, const irc::string &str)
191 {
192         return os << str.c_str();
193 }
194
195 std::istream& operator>>(std::istream &is, irc::string &str)
196 {
197         std::string tmp;
198         is >> tmp;
199         str = tmp.c_str();
200         return is;
201 }
202
203 irc::tokenstream::tokenstream(const std::string &source) : tokens(source), last_pushed(false)
204 {
205         /* Record starting position and current position */
206         last_starting_position = tokens.begin();
207         n = tokens.begin();
208 }
209
210 irc::tokenstream::~tokenstream()
211 {
212 }
213
214 const std::string irc::tokenstream::GetToken()
215 {
216         std::string::iterator lsp = last_starting_position;
217
218         while (n != tokens.end())
219         {
220                 /** Skip multi space, converting "  " into " "
221                  */
222                 while ((n+1 != tokens.end()) && (*n == ' ') && (*(n+1) == ' '))
223                         n++;
224
225                 if ((last_pushed) && (*n == ':'))
226                 {
227                         /* If we find a token thats not the first and starts with :,
228                          * this is the last token on the line
229                          */
230                         std::string::iterator curr = ++n;
231                         n = tokens.end();
232                         return std::string(curr, tokens.end());
233                 }
234
235                 last_pushed = false;
236
237                 if ((*n == ' ') || (n+1 == tokens.end()))
238                 {
239                         /* If we find a space, or end of string, this is the end of a token.
240                          */
241                         last_starting_position = n+1;
242                         last_pushed = true;
243
244                         std::string strip(lsp, n+1 == tokens.end() ? n+1  : n++);
245                         while ((strip.length()) && (strip.find_last_of(' ') == strip.length() - 1))
246                                 strip.erase(strip.end() - 1);
247
248                         return strip;
249                 }
250
251                 n++;
252         }
253         return "";
254 }
255
256 irc::sepstream::sepstream(const std::string &source, char seperator) : tokens(source), sep(seperator)
257 {
258         last_starting_position = tokens.begin();
259         n = tokens.begin();
260 }
261
262 const std::string irc::sepstream::GetToken()
263 {
264         std::string::iterator lsp = last_starting_position;
265
266         while (n != tokens.end())
267         {
268                 if ((*n == sep) || (n+1 == tokens.end()))
269                 {
270                         last_starting_position = n+1;
271                         std::string strip = std::string(lsp, n+1 == tokens.end() ? n+1  : n++);
272
273                         while ((strip.length()) && (strip.find_last_of(sep) == strip.length() - 1))
274                                 strip.erase(strip.end() - 1);
275
276                         return strip;
277                 }
278
279                 n++;
280         }
281
282         return "";
283 }
284
285 irc::sepstream::~sepstream()
286 {
287 }
288
289 std::string irc::hex(const unsigned char *raw, size_t rawsz)
290 {
291         if (!rawsz)
292                 return "";
293
294         char buf[rawsz*2+1];
295         size_t i;
296
297         for (i = 0; i < rawsz; i++)
298         {
299                 sprintf (&(buf[i*2]), "%02x", raw[i]);
300         }
301         buf[i*2] = 0;
302
303         return buf;
304 }
305
306 const char* irc::Spacify(char* n)
307 {
308         static char x[MAXBUF];
309         strlcpy(x,n,MAXBUF);
310         for (char* y = x; *y; y++)
311                 if (*y == '_')
312                         *y = ' ';
313         return x;
314 }
315
316
317 irc::modestacker::modestacker(bool add) : adding(add)
318 {
319         sequence.clear();
320         sequence.push_back("");
321 }
322
323 void irc::modestacker::Push(char modeletter, const std::string &parameter)
324 {
325         *(sequence.begin()) += modeletter;
326         sequence.push_back(parameter);
327 }
328
329 void irc::modestacker::Push(char modeletter)
330 {
331         this->Push(modeletter,"");
332 }
333
334 void irc::modestacker::PushPlus()
335 {
336         this->Push('+',"");
337 }
338
339 void irc::modestacker::PushMinus()
340 {
341         this->Push('-',"");
342 }
343
344 int irc::modestacker::GetStackedLine(std::deque<std::string> &result)
345 {
346         int n = 0;
347         result.clear();
348         result.push_back(adding ? "+" : "-");
349
350         while (!sequence[0].empty() && (sequence.size() > 1) && (result.size() < MAXMODES+1))
351         {
352                 result[0] += *(sequence[0].begin());
353                 if (!sequence[1].empty())
354                         result.push_back(sequence[1]);
355                 sequence[0].erase(sequence[0].begin());
356                 sequence.erase(sequence.begin() + 1);
357                 n++;
358         }
359
360         return n;
361 }
362
363 irc::stringjoiner::stringjoiner(const std::string &seperator, const std::vector<std::string> &sequence, int begin, int end)
364 {
365         for (int v = begin; v < end; v++)
366                 joined.append(sequence[v]).append(seperator);
367         joined.append(sequence[end]);
368 }
369
370 irc::stringjoiner::stringjoiner(const std::string &seperator, const std::deque<std::string> &sequence, int begin, int end)
371 {
372         for (int v = begin; v < end; v++)
373                 joined.append(sequence[v]).append(seperator);
374         joined.append(sequence[end]);
375 }
376
377 irc::stringjoiner::stringjoiner(const std::string &seperator, const char** sequence, int begin, int end)
378 {
379         for (int v = begin; v < end; v++)
380                 joined.append(sequence[v]).append(seperator);
381         joined.append(sequence[end]);
382 }
383
384 std::string& irc::stringjoiner::GetJoined()
385 {
386         return joined;
387 }
388
389 irc::portparser::portparser(const std::string &source, bool allow_overlapped) : in_range(0), range_begin(0), range_end(0), overlapped(allow_overlapped)
390 {
391         sep = new irc::commasepstream(source);
392         overlap_set.clear();
393 }
394
395 irc::portparser::~portparser()
396 {
397         delete sep;
398 }
399
400 bool irc::portparser::Overlaps(long val)
401 {
402         if (!overlapped)
403                 return false;
404
405         if (overlap_set.find(val) == overlap_set.end())
406         {
407                 overlap_set[val] = true;
408                 return false;
409         }
410         else
411                 return true;
412 }
413
414 long irc::portparser::GetToken()
415 {
416         if (in_range > 0)
417         {
418                 in_range++;
419                 if (in_range <= range_end)
420                 {
421                         if (!Overlaps(in_range))
422                         {
423                                 return in_range;
424                         }
425                         else
426                         {
427                                 while (((Overlaps(in_range)) && (in_range <= range_end)))
428                                         in_range++;
429                                 
430                                 if (in_range <= range_end)
431                                         return in_range;
432                         }
433                 }
434                 else
435                         in_range = 0;
436         }
437
438         std::string x = sep->GetToken();
439
440         if (x == "")
441                 return 0;
442
443         while (Overlaps(atoi(x.c_str())))
444         {
445                 x = sep->GetToken();
446
447                 if (x == "")
448                         return 0;
449         }
450
451         std::string::size_type dash = x.rfind('-');
452         if (dash != std::string::npos)
453         {
454                 std::string sbegin = x.substr(0, dash);
455                 std::string send = x.substr(dash+1, x.length());
456                 range_begin = atoi(sbegin.c_str());
457                 range_end = atoi(send.c_str());
458
459                 if ((range_begin > 0) && (range_end > 0) && (range_begin < 65536) && (range_end < 65536) && (range_begin < range_end))
460                 {
461                         in_range = range_begin;
462                         return in_range;
463                 }
464                 else
465                 {
466                         /* Assume its just the one port */
467                         return atoi(sbegin.c_str());
468                 }
469         }
470         else
471         {
472                 return atoi(x.c_str());
473         }
474 }
475