public double distance(Location loc)
{
double delta_lat, delta_lon;
double temp;
double lat1 = latitude;
double lon1 = longitude;
double lat2 = loc.latitude;
double lon2 = loc.longitude;
// convert degrees to radians
lat1 *= RAD_CONVERT;
lat2 *= RAD_CONVERT;
// find the deltas
delta_lat = lat2 - lat1;
delta_lon = (lon2 - lon1) * RAD_CONVERT;
// Find the great circle distance
temp = Math.Pow(Math.Sin(delta_lat/2), 2) + Math.Cos(lat1) * Math.Cos(lat2) * Math.Pow(Math.Sin(delta_lon/2), 2);
return EARTH_DIAMETER * Math.Atan2(Math.Sqrt(temp), Math.Sqrt(1-temp));
}
public Location GetLocationV6(IPAddress addr)
{
byte[] recordBuf = new byte[DbFlags.FULL_RECORD_LENGTH];
char[] recordBuf2 = new char[DbFlags.FULL_RECORD_LENGTH];
int recordBufOffset = 0;
Location record = new Location();
int strLength = 0;
double latitude = 0, longitude = 0;
try
{
int seekCountry = SeekCountryV6(addr);
if (seekCountry == _databaseSegments[0])
{
return null;
}
int recordPointer = seekCountry + ((2 * _recordLength - 1) * _databaseSegments[0]);
recordBuf = _dbReader.Read(recordPointer, DbFlags.FULL_RECORD_LENGTH);
for (int a0 = 0; a0 < DbFlags.FULL_RECORD_LENGTH; a0++)
{
recordBuf2[a0] = Convert.ToChar(recordBuf[a0]);
}
// get country
record.CountryCode = CountryConstants.CountryCodes[UnsignedByteToInt(recordBuf[0])];
record.CountryName = CountryConstants.CountryNames[UnsignedByteToInt(recordBuf[0])];
recordBufOffset++;
// get region
while (recordBuf[recordBufOffset + strLength] != '\0')
strLength++;
if (strLength > 0)
{
record.Region = new String(recordBuf2, recordBufOffset, strLength);
}
recordBufOffset += strLength + 1;
strLength = 0;
// get region_name
record.RegionName = RegionName.GetRegionName(record.CountryCode, record.Region);
// get city
while (recordBuf[recordBufOffset + strLength] != '\0')
strLength++;
if (strLength > 0)
{
record.City = new String(recordBuf2, recordBufOffset, strLength);
}
recordBufOffset += (strLength + 1);
strLength = 0;
// get postal code
while (recordBuf[recordBufOffset + strLength] != '\0')
strLength++;
if (strLength > 0)
{
record.PostalCode = new String(recordBuf2, recordBufOffset, strLength);
}
recordBufOffset += (strLength + 1);
// get latitude
int j;
for (j = 0; j < 3; j++)
latitude += (UnsignedByteToInt(recordBuf[recordBufOffset + j]) << (j * 8));
record.Latitude = (float)latitude / 10000 - 180;
recordBufOffset += 3;
// get longitude
for (j = 0; j < 3; j++)
longitude += (UnsignedByteToInt(recordBuf[recordBufOffset + j]) << (j * 8));
record.Longitude = (float)longitude / 10000 - 180;
record.MetroCode = record.DmaCode = 0;
record.AreaCode = 0;
if (_databaseType == DatabaseTypeCodes.CITY_EDITION_REV1
|| _databaseType == DatabaseTypeCodes.CITY_EDITION_REV1_V6)
{
// get metro_code
int metroareaCombo = 0;
if (record.CountryCode == "US")
{
recordBufOffset += 3;
for (j = 0; j < 3; j++)
metroareaCombo += (UnsignedByteToInt(recordBuf[recordBufOffset + j]) << (j * 8));
record.MetroCode = record.DmaCode = metroareaCombo / 1000;
record.AreaCode = metroareaCombo % 1000;
}
}
}
catch (IOException)
{
Trace.WriteLine("IO Exception while seting up segments");
}
return record;
}
public Location getLocationV6(IPAddress addr)
{
int record_pointer;
byte[] record_buf = new byte[FULL_RECORD_LENGTH];
char[] record_buf2 = new char[FULL_RECORD_LENGTH];
int record_buf_offset = 0;
Location record = new Location();
int str_length = 0;
int j, Seek_country;
double latitude = 0, longitude = 0;
try
{
Seek_country = SeekCountryV6(addr);
if (Seek_country == databaseSegments[0])
return null;
record_pointer = Seek_country + ((2 * recordLength - 1) * databaseSegments[0]);
if ((dboptions & GEOIP_MEMORY_CACHE) == 1)
Array.Copy(dbbuffer, record_pointer, record_buf, 0, Math.Min(dbbuffer.Length - record_pointer, FULL_RECORD_LENGTH));
else
{
lock (ioLock)
{
file.Seek(record_pointer,SeekOrigin.Begin);
file.Read(record_buf,0,FULL_RECORD_LENGTH);
}
}
for (int a0 = 0;a0 < FULL_RECORD_LENGTH;a0++)
record_buf2[a0] = Convert.ToChar(record_buf[a0]);
// get country
record.countryCode = countryCode[unsignedByteToInt(record_buf[0])];
record.countryName = countryName[unsignedByteToInt(record_buf[0])];
record_buf_offset++;
// get region
while (record_buf[record_buf_offset + str_length] != '\0')
str_length++;
if (str_length > 0)
record.region = new String(record_buf2, record_buf_offset, str_length);
record_buf_offset += str_length + 1;
str_length = 0;
// get region_name
record.regionName = RegionName.getRegionName( record.countryCode, record.region );
// get city
while (record_buf[record_buf_offset + str_length] != '\0')
str_length++;
if (str_length > 0)
record.city = new String(record_buf2, record_buf_offset, str_length);
record_buf_offset += (str_length + 1);
str_length = 0;
// get postal code
while (record_buf[record_buf_offset + str_length] != '\0')
str_length++;
if (str_length > 0)
record.postalCode = new String(record_buf2, record_buf_offset, str_length);
record_buf_offset += (str_length + 1);
// get latitude
for (j = 0; j < 3; j++)
latitude += (unsignedByteToInt(record_buf[record_buf_offset + j]) << (j * 8));
record.latitude = (float)latitude/10000 - 180;
record_buf_offset += 3;
// get longitude
for (j = 0; j < 3; j++)
longitude += (unsignedByteToInt(record_buf[record_buf_offset + j]) << (j * 8));
record.longitude = (float)longitude/10000 - 180;
record.metro_code = record.dma_code = 0;
record.area_code = 0;
if (databaseType == DatabaseInfo.CITY_EDITION_REV1
||databaseType == DatabaseInfo.CITY_EDITION_REV1_V6)
{
// get metro_code
int metroarea_combo = 0;
if (record.countryCode == "US")
{
record_buf_offset += 3;
for (j = 0; j < 3; j++)
metroarea_combo += (unsignedByteToInt(record_buf[record_buf_offset + j]) << (j * 8));
record.metro_code = record.dma_code = metroarea_combo/1000;
record.area_code = metroarea_combo % 1000;
}
}
}
catch (IOException)
{
Console.WriteLine("IO Exception while seting up segments");
}
return record;
}
