X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fhashcomp.cpp;h=d107df3093efd5cbe51a236eab2a3ac6b64f46c4;hb=77123f4dec9f29105f6c0ceea0262cfe8e9eaa1a;hp=e8ab857f6ca67186e98de7b5dc99967ffb93be17;hpb=7155b085f7701669ec87e411383ee6348d7e064b;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/hashcomp.cpp b/src/hashcomp.cpp index e8ab857f6..d107df309 100644 --- a/src/hashcomp.cpp +++ b/src/hashcomp.cpp @@ -1,5 +1,24 @@ -#include +/* +------------------------------------+ + * | Inspire Internet Relay Chat Daemon | + * +------------------------------------+ + * + * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev. + * E-mail: + * + * + * + * Written by Craig Edwards, Craig McLure, and others. + * This program is free but copyrighted software; see + * the file COPYING for details. + * + * --------------------------------------------------- + */ + +using namespace std; + +#include "inspircd_config.h" #include "inspircd.h" +#include #include "hashcomp.h" #include "helperfuncs.h" #ifdef GCC3 @@ -14,50 +33,155 @@ #define nspace std #endif +// from helperfuncs.cpp +extern const char lowermap[255]; + +/****************************************************** + * + * The hash functions of InspIRCd are the centrepoint + * of the entire system. If these functions are + * inefficient or wasteful, the whole program suffers + * as a result. A lot of C programmers in the ircd + * scene spend a lot of time debating (arguing) about + * the best way to write hash functions to hash irc + * nicknames, channels etc. + * We are lucky as C++ developers as hash_map does + * a lot of this for us. It does intellegent memory + * requests, bucketing, search functions, insertion + * and deletion etc. All we have to do is write some + * overloaded comparison and hash value operators which + * cause it to act in an irc-like way. The features we + * add to the standard hash_map are: + * + * Case insensitivity: The hash_map will be case + * insensitive. + * + * Scandanavian Comparisons: The characters [, ], \ will + * be considered the lowercase of {, } and |. + * + * This file also contains hashing methods for hashing + * in_addr structs, we use this if we want to cache IP + * addresses. + * + ******************************************************/ + using namespace std; -#ifdef GCC34 -size_t hash::operator()(const struct in_addr &a) const -#else size_t nspace::hash::operator()(const struct in_addr &a) const -#endif { - size_t q; - memcpy(&q,&a,sizeof(size_t)); - return q; + size_t q; + memcpy(&q,&a,sizeof(size_t)); + return q; } -#ifdef GCC34 -size_t hash::operator()(const string &s) const -#else size_t nspace::hash::operator()(const string &s) const -#endif { - char a[MAXBUF]; - static struct hash strhash; - strlcpy(a,s.c_str(),MAXBUF); - strlower(a); - return strhash(a); + char a[MAXBUF]; + static struct hash strhash; + strlcpy(a,s.c_str(),MAXBUF); + strlower(a); + return strhash(a); } -bool StrHashComp::operator()(const string& s1, const string& s2) const +bool irc::StrHashComp::operator()(const std::string& s1, const std::string& s2) const { - char a[MAXBUF],b[MAXBUF]; - strlcpy(a,s1.c_str(),MAXBUF); - strlcpy(b,s2.c_str(),MAXBUF); - strlower(a); - strlower(b); - return (strcasecmp(a,b) == 0); + unsigned char* n1 = (unsigned char*)s1.c_str(); + unsigned char* n2 = (unsigned char*)s2.c_str(); + for (; *n1 && *n2; n1++, n2++) + if (lowermap[*n1] != lowermap[*n2]) + return false; + return (lowermap[*n1] == lowermap[*n2]); } -bool InAddr_HashComp::operator()(const in_addr &s1, const in_addr &s2) const +bool irc::InAddr_HashComp::operator()(const in_addr &s1, const in_addr &s2) const { - size_t q; - size_t p; + return (s1.s_addr == s1.s_addr); +} - memcpy(&q,&s1,sizeof(size_t)); - memcpy(&p,&s2,sizeof(size_t)); +/****************************************************** + * + * This is the implementation of our special irc::string + * class which is a case-insensitive equivalent to + * std::string which is not only case-insensitive but + * can also do scandanavian comparisons, e.g. { = [, etc. + * + * This class depends on the global 'lowermap' which is + * initialized at startup by inspircd.cpp, and contains + * the 'scandanavian' casemappings for fast irc compare. + * + ******************************************************/ - return (q == p); +bool irc::irc_char_traits::eq(char c1st, char c2nd) +{ + return lowermap[(unsigned char)c1st] == lowermap[(unsigned char)c2nd]; +} + +bool irc::irc_char_traits::ne(char c1st, char c2nd) +{ + return lowermap[(unsigned char)c1st] != lowermap[(unsigned char)c2nd]; } +bool irc::irc_char_traits::lt(char c1st, char c2nd) +{ + return lowermap[(unsigned char)c1st] < lowermap[(unsigned char)c2nd]; +} + +int irc::irc_char_traits::compare(const char* str1, const char* str2, size_t n) +{ + for(unsigned int i = 0; i < n; i++) + { + if(lowermap[(unsigned char)*str1] > lowermap[(unsigned char)*str2]) + return 1; + + if(lowermap[(unsigned char)*str1] < lowermap[(unsigned char)*str2]) + return -1; + + if(*str1 == 0 || *str2 == 0) + return 0; + + str1++; + str2++; + } + return 0; +} + +std::string operator+ (std::string& leftval, irc::string& rightval) +{ + return leftval + std::string(rightval.c_str()); +} + +irc::string operator+ (irc::string& leftval, std::string& rightval) +{ + return leftval + irc::string(rightval.c_str()); +} + +bool operator== (std::string& leftval, irc::string& rightval) +{ + return (leftval == std::string(rightval.c_str())); +} + +bool operator== (irc::string& leftval, std::string& rightval) +{ + return (rightval == std::string(leftval.c_str())); +} + +const char* irc::irc_char_traits::find(const char* s1, int n, char c) +{ + while(n-- > 0 && lowermap[(unsigned char)*s1] != lowermap[(unsigned char)c]) + s1++; + return s1; +} + +/* See hashcomp.h if you care about these... */ +std::ostream& operator<<(std::ostream &os, const irc::string &str) +{ + return os << str.c_str(); +} + +std::istream& operator>>(std::istream &is, irc::string &str) +{ + std::string tmp; + is >> tmp; + str = tmp.c_str(); + return is; +}