public IpInfo MemorySearch(string ipStr)
{
IpInfo ipInfo = null;
long dataPtr = 0;
if (totalBlocks == 0)
{
dbBinStr = File.ReadAllBytes(dbFile);
firstIndexPtr = getLong(dbBinStr, 0);
lastIndexPtr = getLong(dbBinStr, 4);
totalBlocks = (lastIndexPtr - firstIndexPtr) / INDEX_BLOCK_LENGTH + 1;
}
var ip = ip2long(ipStr);
var h = totalBlocks;
long l = 0;
while (l <= h)
{
var m = (l + h) >> 1;
var p = firstIndexPtr + m * INDEX_BLOCK_LENGTH;
var sip = getLong(dbBinStr, p);
if (ip < sip)
{
h = m - 1;
}
else
{
var eip = getLong(dbBinStr, p + 4);
if (ip > eip)
{
l = m + 1;
}
else
{
dataPtr = getLong(dbBinStr, p + 8);
break;
}
}
}
if (dataPtr != 0)
{
var dataLen = ((dataPtr >> 24) & 0xff);
dataPtr = (dataPtr & 0x00ffffff);
var len = dataLen - 4;
byte[] x = new byte[len];
Array.Copy(dbBinStr, dataPtr + 4, x, 0, len);
ipInfo = getIpInfo(getLong(dbBinStr, dataPtr), x);
}
return(ipInfo);
}
public IpInfo getIpInfo(long cityId, byte[] line)
{
var lineSlice = System.Text.Encoding.UTF8.GetString(line).Split('|');
var ipInfo = new IpInfo();
ipInfo.CityId = cityId;
if (lineSlice.Count() < 5)
{
var a = new string[5];
lineSlice.CopyTo(a, 0);
lineSlice = a;
}
ipInfo.Country = lineSlice[0];
ipInfo.Region = lineSlice[1];
ipInfo.Province = lineSlice[2];
ipInfo.City = lineSlice[3];
ipInfo.ISP = lineSlice[4];
return(ipInfo);
}
