纯真IP数据库解析Delphi D10.1下正常使用

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纯真IP数据库解析Delphi D10.1下正常使用

直接一个单元，代码分享出来。
Delphi/Pascal
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unit Net.IPLocation;
 
interface
 
usesSystem.Classes,System.SysUtils,Winapi.WinSock,Vcl.Forms,
  System.Math,System.SyncObjs;
 
type
  TIPLocation=class(TObject)
  private
    QQWryFileName:string;
    QQWryFileStream:TBufferedFileStream;
    QQWryFileSize:Cardinal;
    IPRecordNum:Cardinal;
    FirstIPIndexOffset,LastIPIndexOffset:Cardinal;
    FLock:TCriticalSection;
 
    functionGetQQWryFileName:string;
    functionGetQQWryFileSize:Cardinal;
    functionGetIPRecordNum:Cardinal;
    functionGetQQWryDate:TDate;
    functionGetQQWryDataFrom:string;
    functionGetIPLocation(IPLocationOffset:Cardinal):TStringlist;
    functionGetIPMsg(IPRecordID:Cardinal):TStringlist;
    functionGetIPRecordID(IP:string):Cardinal;
    functionGetIPValue(IP:string):Cardinal;
  public
    constructorCreate(cQQWryFileName:string);
    destructorDestroy;override;
    functionGetLocation(IP:string):String;
  end;
 
functionIPLocation:TIPLocation;
 
implementation
 
var
  __IPLocation:TIPLocation;
 
functionIPLocation:TIPLocation;
begin
  if__IPLocation=nilthen
    __IPLocation:=TIPLocation.Create(ExtractFilePath(ParamStr(0))+
      'qqwry.dat');
 
  Result:=__IPLocation;
end;
 
{TIPLocation}
 
constructorTIPLocation.Create(cQQWryFileName:string);
begin
  inheritedCreate;
  FLock:=TCriticalSection.Create;
  QQWryFileName:=cQQWryFileName;
  QQWryFileStream:=TBufferedFileStream.Create(QQWryFileName,
    fmOpenReadorfmShareDenyWrite,0);
  QQWryFileSize:=QQWryFileStream.Size;
  QQWryFileStream.Read(FirstIPIndexOffset,4);
  QQWryFileStream.Read(LastIPIndexOffset,4);
  IPRecordNum:=(LastIPIndexOffset-FirstIPIndexOffset)div7+1;
end;
 
destructorTIPLocation.Destroy;
begin
 
  QQWryFileStream.Free;
  FLock.Free;
  inheritedDestroy;
end;
 
functionTIPLocation.GetIPLocation(IPLocationOffset:Cardinal):TStringlist;
const
  // 实际信息字串存放位置的重定向模式
  REDIRECT_MODE_1=1;
  REDIRECT_MODE_2=2;
var
  RedirectMode:byte;
  CountryFirstOffset,CountrySecondOffset:Cardinal;
  CountryMsg,AreaMsg:string;
  //
  functionReadString(StringOffset:Cardinal):ansistring;
  var
    ReadByte:ansichar;
  begin
    Result:='';
    QQWryFileStream.Seek(StringOffset,soFromBeginning);
    QQWryFileStream.Read(ReadByte,1);
    whileord(ReadByte)<>0do
    begin
      Result:=Result+ReadByte;
      QQWryFileStream.Read(ReadByte,1);
    end;
  end;
//
  functionReadArea(AreaOffset:Cardinal):ansistring;
  var
    ModeByte:byte;
    ReadAreaOffset:Cardinal;
  begin
    ReadAreaOffset:=0;
    QQWryFileStream.Seek(AreaOffset,soFromBeginning);
    QQWryFileStream.Read(ModeByte,1);
    if(ModeByte=REDIRECT_MODE_1)or(ModeByte=REDIRECT_MODE_2)then
    begin
      QQWryFileStream.Read(ReadAreaOffset,3);
      ifReadAreaOffset=0then
        Result:='未知地区'
      else
        Result:=ReadString(ReadAreaOffset);
    end
    else
    begin
      Result:=ReadString(AreaOffset);
    end;
  end;
 
begin
  CountryFirstOffset:=0;
  CountrySecondOffset:=0;
  // 跳过4个字节，该4字节内容为该条IP信息里IP地址段中的终止IP值
  QQWryFileStream.Seek(IPLocationOffset+4,soFromBeginning);
  // 读取国家信息的重定向模式值
  QQWryFileStream.Read(RedirectMode,1);
  // 重定向模式1的处理
  ifRedirectMode=REDIRECT_MODE_1then
  begin
    // 模式值为1，则后3个字节的内容为国家信息的重定向偏移值
    QQWryFileStream.ReadData(CountryFirstOffset,3);
    // 进行重定向
    QQWryFileStream.Seek(CountryFirstOffset,soFromBeginning);
    // 第二次读取国家信息的重定向模式
    QQWryFileStream.Read(RedirectMode,1);
    // 第二次重定向模式为模式2的处理
    ifRedirectMode=REDIRECT_MODE_2then
    begin
      // 后3字节的内容即为第二次重定向偏移值
      QQWryFileStream.ReadData(CountrySecondOffset,3);
      // 读取第二次重定向偏移值下的字符串值，即为国家信息
      CountryMsg:=ReadString(CountrySecondOffset);
      // 若第一次重定向模式为1，进行重定向后读取的第二次重定向模式为2，
      // 则地区信息存放在第一次国家信息偏移值的后面
      QQWryFileStream.Seek(CountryFirstOffset+4,soFromBeginning);
      // 第二次重定向模式不是模式2的处理
    end
    else
    begin
      CountryMsg:=ReadString(CountryFirstOffset);
    end;
    // 在重定向模式1下读地区信息值
    AreaMsg:=ReadArea(QQWryFileStream.Position);
    // 重定向模式2的处理
  end
  elseifRedirectMode=REDIRECT_MODE_2then
  begin
    QQWryFileStream.ReadData(CountrySecondOffset,3);
    CountryMsg:=ReadString(CountrySecondOffset);
    AreaMsg:=ReadArea(IPLocationOffset+8);
    // 不是重定向模式的处理，存放的即是IP地址信息
  end
  else
  begin
    CountryMsg:=ReadString(QQWryFileStream.Position-1);
    AreaMsg:=ReadArea(QQWryFileStream.Position);
  end;
  Result:=TStringlist.Create;
  Result.Add(CountryMsg);
  Result.Add(AreaMsg);
end;
 
functionTIPLocation.GetIPMsg(IPRecordID:Cardinal):TStringlist;
var
  aryStartIP:array[1..4]ofbyte;
  strStartIP:string;
  EndIPOffset:Cardinal;
  aryEndIP:array[1..4]ofbyte;
  strEndIP:string;
  i:integer;
begin
  EndIPOffset:=0;
 
  // 根据记录ID号移到该记录号的索引处
  QQWryFileStream.Seek(FirstIPIndexOffset+(IPRecordID-1)*7,
    soFromBeginning);
  // 索引的前4个字节为起始IP地址
  QQWryFileStream.Read(aryStartIP,4);
  // 后3个字节是内容区域的偏移值
  // QQWryFileStream.Read(EndIPOffset, 3);
  QQWryFileStream.ReadData(EndIPOffset,3);
  // 移至内容区域
  QQWryFileStream.Seek(EndIPOffset,soFromBeginning);
  // 内容区域的前4个字节为终止IP地址
  QQWryFileStream.Read(aryEndIP,4);
 
  // 将起止IP地址转换为点分的形式
  strStartIP:='';
  fori:=4downto1do
  begin
    ifi<>1then
      strStartIP:=strStartIP+IntToStr(aryStartIP[i])+'.'
    else
      strStartIP:=strStartIP+IntToStr(aryStartIP[i]);
  end;
  strEndIP:='';
  fori:=4downto1do
  begin
    ifi<>1then
      strEndIP:=strEndIP+IntToStr(aryEndIP[i])+'.'
    else
      strEndIP:=strEndIP+IntToStr(aryEndIP[i]);
  end;
  Result:=TStringlist.Create;
  Result.Add(strStartIP);
  Result.Add(strEndIP);
  // 获取该条记录下的IP地址信息
  // 以下三者是统一的：①内容区域的偏移值 ②终止IP地址的存放位置 ③国家信息紧接在终止IP地址存放位置后
  Result.AddStrings(GetIPLocation(EndIPOffset));
end;
 
functionTIPLocation.GetIPRecordID(IP:string):Cardinal;
  functionSearchIPRecordID(IPRecordFrom,IPRecordTo,IPValue:Cardinal)
    :Cardinal;
  var
    CompareIPValue1,CompareIPValue2:Cardinal;
  begin
    Result:=0;
    CompareIPValue1:=0;
    CompareIPValue2:=0;
    QQWryFileStream.Seek(FirstIPIndexOffset+((IPRecordTo-IPRecordFrom)div2
      +IPRecordFrom-1)*7,soFromBeginning);
    QQWryFileStream.Read(CompareIPValue1,4);
    QQWryFileStream.Seek(FirstIPIndexOffset+((IPRecordTo-IPRecordFrom)div2
      +IPRecordFrom)*7,soFromBeginning);
    QQWryFileStream.Read(CompareIPValue2,4);
    // 找到了
    if(IPValue>=CompareIPValue1)and(IPValue<CompareIPValue2)then
    begin
      Result:=(IPRecordTo-IPRecordFrom)div2+IPRecordFrom;
    end
    else
      // 后半段找
      ifIPValue>CompareIPValue1then
      begin
        Result:=SearchIPRecordID((IPRecordTo-IPRecordFrom)div2+
          IPRecordFrom+1,IPRecordTo,IPValue);
      end
      else
        // 前半段找
        ifIPValue<CompareIPValue1then
        begin
          Result:=SearchIPRecordID(IPRecordFrom,(IPRecordTo-IPRecordFrom)
            div2+IPRecordFrom-1,IPValue);
        end;
  end;
 
begin
  Result:=SearchIPRecordID(1,GetIPRecordNum,GetIPValue(IP));
end;
 
functionTIPLocation.GetIPRecordNum:Cardinal;
begin
  Result:=IPRecordNum;
end;
 
functionTIPLocation.GetIPValue(IP:string):Cardinal;
var
  tsIP:TStringlist;
  i:integer;
  functionSplitStringToStringlist(aString:string;aSplitChar:string)
    :TStringlist;
  begin
    Result:=TStringlist.Create;
    whilepos(aSplitChar,aString)>0do
    begin
      Result.Add(copy(aString,1,pos(aSplitChar,aString)-1));
      aString:=copy(aString,pos(aSplitChar,aString)+1,
        length(aString)-pos(aSplitChar,aString));
    end;
    Result.Add(aString);
  end;
 
begin
  tsIP:=SplitStringToStringlist(IP,'.');
  Result:=0;
  fori:=3downto0do
  begin
    Result:=Result+StrToInt(tsIP[i])*trunc(power(256,3-i));
  end;
end;
 
functionTIPLocation.GetLocation(IP:string):String;
begin
  FLock.Enter;
  try
    Result:=GetIPMsg(GetIPRecordID(IP))[2];
  finally
    FLock.Leave;
  end;
end;
 
functionTIPLocation.GetQQWryDataFrom:string;
begin
  Result:=GetIPMsg(GetIPRecordNum)[2];
end;
 
functionTIPLocation.GetQQWryDate:TDate;
var
  DateString:string;
begin
  DateString:=GetIPMsg(GetIPRecordNum)[3];
  DateString:=copy(DateString,1,pos('IP数据',DateString)-1);
  DateString:=StringReplace(DateString,'年','-',
    [rfReplaceAll,rfIgnoreCase]);
  DateString:=StringReplace(DateString,'月','-',
    [rfReplaceAll,rfIgnoreCase]);
  DateString:=StringReplace(DateString,'日','-',
    [rfReplaceAll,rfIgnoreCase]);
  Result:=StrToDate(DateString);
end;
 
functionTIPLocation.GetQQWryFileName:string;
begin
  Result:=QQWryFileName;
end;
 
functionTIPLocation.GetQQWryFileSize:Cardinal;
begin
  Result:=QQWryFileSize;
end;
 
initialization
 
finalization
 
if__IPLocation<>nilthen
  __IPLocation.Free;
 
end.
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