unit SkinRead;

{$WARNINGS OFF}
{$HINTS OFF}

interface

{$define skinfile2}

uses Windows, Messages, SysUtils, Classes, Graphics, Controls,Forms,
     FileCtrl,Winconvert,Dialogs;

type
  TSkinHeader = record
     Version:integer;
     DirLen :integer;
     U1     :integer;
     U2     :integer;
  end;

   TSkinReader = class(Tobject)
   private
   protected
   public
      Dir:Tstringlist;
      dirlen,Num:integer;
      sizes:Array[0..1000] of integer;
      ms : Tmemorystream;
      header:TSkinHeader;
      constructor Create;
      destructor Destroy; override;
      function loadfromfile(const aname:string):boolean;
      procedure readfile( aname:string;m:TmemoryStream);
      procedure readIni(const aname:string;m:TmemoryStream;var fname:string);
      procedure Decompress(source,Dest:TStream);
      function Loadfromstream(r2:Tmemorystream):boolean;
   end;

implementation

constructor TSkinReader.Create;
begin
   dir:=Tstringlist.create;
   ms:=Tmemorystream.create;
end;

destructor TSkinReader.Destroy;
begin
   dir.free;
   ms.free;
end;

function TSkinReader.loadfromfile(const aname:string):boolean;
var r,r2:Tmemorystream;
    s,s1:string;
    i:integer;
    b:boolean;
begin
    b:=false;
    result:=b;
    if not fileexists(aname) then exit;
    s1:= Extractfilepath(aname);
    r:=Tmemorystream.create;
    r2:=Tmemorystream.create;
    try
    r2.loadfromfile(aname);
    Decompress(r2,r);
//    r.loadfromfile(aname);
    r.Seek(0,soFromBeginning);
    r.read(header,sizeof(Tskinheader));
    if header.version=20000 then  begin
       setlength(s,header.dirlen);
       r.read(s[1],header.dirlen);
       dir.text:=lowercase(s);
       Num:=dir.count;
       r.read(sizes[0],num*sizeof(integer));
       i:=(num)*sizeof(integer)+header.dirlen+sizeof(Tskinheader);
       ms.Seek(0,soFromBeginning);
       ms.write(Pointer(Longint(r.Memory)+i)^,r.size-i);
       b:=true;
    end else showmessage('This is Older Skin File'#13'Please update to new version !');
    finally
    r.free;
    r2.free;
    end;
    result:=b;
end;

function TSkinReader.loadfromstream(r2:Tmemorystream):boolean;
var r:Tmemorystream;
    s,s1:string;
    i:integer;
    b:boolean;
begin
    r:=Tmemorystream.create;
    b:=false;
    try
    Decompress(r2,r);
    r.Seek(0,soFromBeginning);
    r.read(header,sizeof(Tskinheader));
    if header.version=20000 then begin
       setlength(s,header.dirlen);
       r.read(s[1],header.dirlen);
       dir.text:=lowercase(s);
       Num:=dir.count;
       r.read(sizes[0],num*sizeof(integer));
       i:=(num)*sizeof(integer)+header.dirlen+sizeof(Tskinheader);
       ms.Seek(0,soFromBeginning);
       ms.write(Pointer(Longint(r.Memory)+i)^,r.size-i);
       b:=true;
    end else showmessage('This is Older Skin File'#13'Please update to new version !');
    finally
    r.free;
    end;
    result:=b;
end;

{$IFDEF skinfile1}
function TSkinReader.loadfromfile(const aname:string):boolean;
var r,r2:Tmemorystream;
    s,s1:string;
    i:integer;
    b:boolean;
begin
    b:=false;
    if not fileexists(aname) then exit;
    s1:= Extractfilepath(aname);
    r:=Tmemorystream.create;
    r2:=Tmemorystream.create;
    try
    r2.loadfromfile(aname);
    Decompress(r2,r);
    r.Seek(0,soFromBeginning);
    r.read(dirlen,sizeof(integer));
    if dirlen>0 then  begin
       setlength(s,dirlen);
       r.read(s[1],dirlen);
       dir.text:=lowercase(s);
       Num:=dir.count;
       r.read(sizes[0],num*sizeof(integer));
       i:=(num+1)*sizeof(integer)+dirlen;
       ms.Seek(0,soFromBeginning);
       ms.write(Pointer(Longint(r.Memory)+i)^,r.size-i);
       b:=true;
    end;
    finally
    r.free;
    r2.free;
    end;
    result:=b;
end;

function TSkinReader.loadfromstream(r2:Tmemorystream):boolean;
var r:Tmemorystream;
    s,s1:string;
    i:integer;
    b:boolean;
begin
    r:=Tmemorystream.create;
    b:=false;
    try
    Decompress(r2,r);
    r.Seek(0,soFromBeginning);
    r.read(dirlen,sizeof(integer));
    if dirlen>0 then begin
       setlength(s,dirlen);
       r.read(s[1],dirlen);
       dir.text:=lowercase(s);
       Num:=dir.count;
       r.read(sizes[0],num*sizeof(integer));
       i:=(num+1)*sizeof(integer)+dirlen;
       ms.Seek(0,soFromBeginning);
       ms.write(Pointer(Longint(r.Memory)+i)^,r.size-i);
       b:=true;
    end;
    finally
    r.free;
    end;
    result:=b;
end;
{$ENDIF}

procedure TSkinReader.Decompress(source,Dest:TStream);
var
   LZH: TLZH;
   Size, Bytes: Longint;
begin
    // Decompress in memory blob.
    LZH := TLZH.Create;
    try
       LZH.StreamIn:= source;
       LZH.StreamOut:=dest;
       LZH.StreamIn.Position := 0;
       LZH.StreamOut.Position := 0;

       // Uncompressed file size
       LZH.StreamIn.Read(size, sizeof(Longint));
       Bytes := Size;

       // Decompress rest of stream.
       LZH.LZHUnpack(Bytes, LZH.GetBlockStream, LZH.PutBlockStream);
    finally
       LZH.Free;
    end;
end;

procedure TSkinReader.readfile( aname:string;m:TmemoryStream);
var i,j:integer;
begin
  m.clear;
  ms.Seek(0,soFromBeginning);
  j:=0;
  aname:=lowercase(aname);
  for i:= 0 to num-1 do begin
    if dir[i]=aname then begin
      m.write(Pointer(Longint(ms.Memory)+j)^,sizes[i]);
      m.Seek(0,soFromBeginning);
      break;
    end;
    inc(j,sizes[i]);
  end;
end;

procedure TSkinReader.readIni(const aname:string;m:TmemoryStream;var fname:string);
var i,j:integer;
begin
  m.clear;
  ms.Seek(0,soFromBeginning);
  j:=0;
  for i:= 0 to num-1 do begin
    if pos(aname,dir[i])>0 then begin
      m.write(Pointer(Longint(ms.Memory)+j)^,sizes[i]);
      m.Seek(0,soFromBeginning);
      fname:=dir[i];
      break;
    end;
    inc(j,sizes[i]);
  end;
end;

end.