protected IPQuery.CZ_INDEX_INFO IndexInfoAtPos(uint Index_Pos)
{
IPQuery.CZ_INDEX_INFO cz_index_info = new IPQuery.CZ_INDEX_INFO();
this.FileStrm.Seek(( long )(this.Index_Set + (7 * Index_Pos)), SeekOrigin.Begin);
cz_index_info.IpSet = this.GetUInt32();
cz_index_info.Offset = this.GetOffset();
this.FileStrm.Seek(( long )cz_index_info.Offset, SeekOrigin.Begin);
cz_index_info.IpEnd = this.GetUInt32();
return(cz_index_info);
}
/// <summary>
/// 获取IP地址归属地
/// </summary>
/// <param name="IPValue">要查找的IP地址</param>
/// <returns></returns>
public string GetAddressWithIP(string IPValue)
{
if (!this.bFilePathInitialized)
{
return("");
}
this.Initialize();
uint num = this.IPToUInt32(IPValue);
while (true)
{
//首先初始化本轮查找的区间
//区间头
this.Search_Set = this.IndexInfoAtPos(this.Search_Index_Set);
//区间尾
this.Search_End = this.IndexInfoAtPos(this.Search_Index_End);
if ((num >= this.Search_Set.IpSet) && (num <= this.Search_Set.IpEnd))
{
return(this.ReadAddressInfoAtOffset(this.Search_Set.Offset));
}
if ((num >= this.Search_End.IpSet) && (num <= this.Search_End.IpEnd))
{
return(this.ReadAddressInfoAtOffset(this.Search_End.Offset));
}
this.Search_Mid = this.IndexInfoAtPos((this.Search_Index_End + this.Search_Index_Set) / 2);
if ((num >= this.Search_Mid.IpSet) && (num <= this.Search_Mid.IpEnd))
{
return(this.ReadAddressInfoAtOffset(this.Search_Mid.Offset));
}
if (num < this.Search_Mid.IpSet)
{
this.Search_Index_End = (this.Search_Index_End + this.Search_Index_Set) / 2;
}
else
{
this.Search_Index_Set = (this.Search_Index_End + this.Search_Index_Set) / 2;
}
}
}
