-namespace {
-
-using Msp::Time::TimeZone;
-
-#ifndef WIN32
-long get_long(char *&ptr)
-{
- long result=0;
- for(unsigned i=0; i<4; ++i)
- result=(result<<8)+static_cast<unsigned char >(*ptr++);
- return result;
-}
-#endif
-
-TimeZone get_local_timezone()
-{
-#ifdef WIN32
- TIME_ZONE_INFORMATION tzinfo;
- DWORD dst=GetTimeZoneInformation(&tzinfo);
- if(dst==TIME_ZONE_ID_INVALID)
- throw Msp::SystemError("Failed to get time zone information", GetLastError());
-
- int offset=tzinfo.Bias;
- if(dst==TIME_ZONE_ID_STANDARD)
- offset+=tzinfo.StandardBias;
- else if(dst==TIME_ZONE_ID_DAYLIGHT)
- offset+=tzinfo.DaylightBias;
-
- return TimeZone(offset);
-#else
- int fd=open("/etc/localtime", O_RDONLY);
- if(fd>=-1)
- {
- char hdr[44];
- int len=read(fd, hdr, sizeof(hdr));
- long gmtoff=-1;
- string name;
- if(len==44 && hdr[0]=='T' && hdr[1]=='Z' && hdr[2]=='i' && hdr[3]=='f')
- {
- char *ptr=hdr+20;
- long isgmtcnt=get_long(ptr);
- long isstdcnt=get_long(ptr);
- long leapcnt=get_long(ptr);
- long timecnt=get_long(ptr);
- long typecnt=get_long(ptr);
- long charcnt=get_long(ptr);
- int size=timecnt*5+typecnt*6+isgmtcnt+isstdcnt+leapcnt*8+charcnt;
- char buf[size];
- len=read(fd, buf, size);
- if(len==size)
- {
- ptr=buf;
- int index=-1;
- time_t cur_time=Msp::Time::now().to_unixtime();
- for(int i=0; i<timecnt; ++i)
- if(get_long(ptr)<=cur_time)
- index=i;
-
- if(index>0)
- index=ptr[index];
- ptr+=timecnt;
-
- int abbrind=0;
- for(int i=0; i<typecnt; ++i)
- {
- if((index>=0 && i==index) || (index<0 && !ptr[4] && gmtoff==-1))
- {
- gmtoff=get_long(ptr);
- ++ptr;
- abbrind=*ptr++;
- }
- else
- ptr+=6;
- }
-
- name=ptr+abbrind;
- }
- }
- close(fd);
-
- if(gmtoff!=-1)
- return TimeZone(-gmtoff/60, name);
- }
- return TimeZone();
-#endif
-}
-
-}
-