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{
}
unit UnzipDLL;
{$IFDEF VIRTUALPASCAL}
{$Cdecl+,AlignRec-,OrgName+}
{$ELSE}
{$IFDEF FPC}
{$PACKRECORDS 1}
{$ENDIF}
{$ENDIF}
interface
uses
ZipTypes;
const
UnzipErr: longint = 0;
type
TArgV = array [0..1023] of PChar;
PArgV = ^TArgV;
TCharArray = array [1..1024*1024] of char;
PCharArray = ^TCharArray;
TFileUnzipEx = function (SourceZipFile, TargetDirectory,
FileSpecs: PChar): integer;
function DllFileUnzipEx (SourceZipFile, TargetDirectory,
FileSpecs: PChar): integer;
const
FileUnzipEx: TFileUnzipEx = @DllFileUnzipEx;
(* Returns non-zero result on success. *)
implementation
uses
{$IFDEF OS2}
{$IFDEF FPC}
DosCalls,
{$ELSE FPC}
{$IFDEF VirtualPascal}
OS2Base,
{$ELSE VirtualPascal}
BseDos,
{$ENDIF VirtualPascal}
{$ENDIF FPC}
{$ELSE}
{$IFDEF WIN32}
Windows,
{$ENDIF WIN32}
{$ENDIF OS2}
Unzip51g, Dos;
type
UzpMainFunc = function (ArgC: longint; var ArgV: TArgV): longint; cdecl;
const
{$IFDEF OS2}
AllFiles: string [1] = '*';
{$ELSE}
{$IFDEF WIN32}
AllFiles: string [3] = '*.*';
{$ENDIF}
{$ENDIF}
{$IFDEF OS2}
LibPath = 'LIBPATH';
{$ELSE}
LibPath = 'PATH';
{$ENDIF}
UzpMainOrd = 4;
DLLName: string [8] = 'UNZIP32'#0;
UzpMain: UzpMainFunc = nil;
QuietOpt: array [1..4] of char = '-qq'#0;
OverOpt: array [1..3] of char = '-o'#0;
CaseInsOpt: array [1..3] of char = '-C'#0;
ExDirOpt: array [1..3] of char = '-d'#0;
OptCount = 4;
var
DLLHandle: longint;
OldExit: pointer;
C: char;
function DLLInit: boolean;
var
{$IFDEF OS2}
ErrPath: array [0..259] of char;
{$ENDIF}
DLLPath: PathStr;
Dir: DirStr;
Name: NameStr;
Ext: ExtStr;
begin
DLLInit := false;
FSplit (FExpand (ParamStr (0)), Dir, Name, Ext);
DLLPath := Dir + DLLName;
Insert ('.DLL', DLLPath, byte (DLLPath [0]));
{$IFDEF OS2}
if (DosLoadModule (@ErrPath, SizeOf (ErrPath), @DLLPath [1], DLLHandle) <> 0)
and (DosLoadModule (@ErrPath, SizeOf (ErrPath), @DLLName [1], DLLHandle) <> 0)
then
begin
if ErrPath [0] <> #0 then
begin
Write (#13#10'Error while loading module ');
WriteLn (PChar (@ErrPath));
end;
{$IFDEF FPC}
end else DLLInit := DosQueryProcAddr (DLLHandle, UzpMainOrd, nil, pointer (UzpMain)) = 0;
{$ELSE}
end else DLLInit := DosQueryProcAddr (DLLHandle, UzpMainOrd, nil, @UzpMain) = 0;
{$ENDIF}
{$ELSE}
{$IFDEF WIN32}
DLLHandle := LoadLibrary (@DLLPath [1]);
if DLLHandle = 0 then DLLHandle := LoadLibrary (@DLLName [1]);
if DLLHandle = 0 then WriteLn (#13#10'Error while loading DLL.') else
begin
(* UzpMain := UzpMainFunc (GetProcAddress (DLLHandle, 'UzpMain'));
*)
UzpMain := UzpMainFunc (GetProcAddress (DLLHandle, 'Unz_Unzip'));
DLLInit := Assigned (UzpMain);
end;
{$ENDIF}
{$ENDIF}
end;
procedure NewExit;
begin
ExitProc := OldExit;
{$IFDEF OS2}
DosFreeModule (DLLHandle);
{$ELSE}
{$IFDEF WIN32}
FreeLibrary (DLLHandle);
{$ENDIF}
{$ENDIF}
end;
function DllFileUnzipEx (SourceZipFile, TargetDirectory,
FileSpecs: PChar): integer;
var
I, FCount, ArgC: longint;
ArgV: TArgV;
P: PChar;
StrLen: array [Succ (OptCount)..1023] of longint;
begin
ArgV [0] := @DLLName;
ArgV [1] := @QuietOpt;
ArgV [2] := @OverOpt;
ArgV [3] := @CaseInsOpt;
ArgV [4] := SourceZipFile;
FCount := 0;
if FileSpecs^ <> #0 then
begin
P := FileSpecs;
I := 0;
repeat
case FileSpecs^ of
'"': begin
Inc (FileSpecs);
repeat Inc (I) until (FileSpecs^ = '"') or (FileSpecs^ = #0);
Inc (FileSpecs);
Inc (I);
end;
'''': begin
Inc (FileSpecs);
repeat Inc (I) until (FileSpecs^ = '''') or (FileSpecs^ = #0);
Inc (FileSpecs);
Inc (I);
end;
#0, ' ', #9: begin
Inc (I);
Inc (FCount);
GetMem (ArgV [OptCount + FCount], I);
Move (P^, ArgV [OptCount + FCount]^, Pred (I));
PCharArray (ArgV [OptCount + FCount])^ [I] := #0;
StrLen [OptCount + FCount] := I;
while (FileSpecs^ = #9) or (FileSpecs^ = ' ') do Inc (FileSpecs);
P := FileSpecs;
I := 0;
end;
else
begin
Inc (I);
Inc (FileSpecs);
end;
end;
until (FileSpecs^ = #0) and (I = 0);
end else
begin
FCount := 1;
StrLen [OptCount + FCount] := Succ (byte (AllFiles [0]));
GetMem (ArgV [OptCount + FCount], StrLen [OptCount + FCount]);
Move (AllFiles [1], ArgV [OptCount + FCount]^, StrLen [OptCount + FCount]);
end;
ArgC := Succ (FCount + OptCount);
ArgV [ArgC] := @ExDirOpt;
Inc (ArgC);
ArgV [ArgC] := TargetDirectory;
Inc (ArgC);
ArgV [ArgC] := @ExDirOpt [3]; (* contains #0 *)
UnzipErr := UzpMain (ArgC, ArgV);
if UnzipErr <> 0 then DllFileUnzipEx := 0 else DllFileUnzipEx := FCount;
for I := 1 to FCount do FreeMem (ArgV [I + OptCount], StrLen [I + OptCount]);
end;
begin
{$IFDEF EMX}
if os_Mode <> osOS2 then
FileUnzipEx := TFileUnzipEx (@Unzip.FileUnzipEx)
else
{$ENDIF EMX}
if DLLInit then
begin
OldExit := ExitProc;
ExitProc := @NewExit;
if GetEnv ('TZ') = '' then
begin
WriteLn (#13#10'TZ variable was not found in your environment.');
WriteLn ('This variable is necessary for setting correct date/time of unpacked files.');
WriteLn ('Please, add it to your environment and restart this program afterwards.');
Halt (1);
end;
end else
begin
WriteLn (#13#10'Dynamic library UNZIP32.DLL from InfoZip is needed to unpack archives.');
WriteLn ('This library could not be found on your system, however.');
WriteLn ('Please, download the library, either from the location where you found');
WriteLn ('this package, or from any FTP archive carrying InfoZip programs.');
WriteLn ('If you already have this DLL, please, check your configuration (' + LibPath + ').');
WriteLn (#13#10'If you want to try unpacking the files with internal unpacking routine,');
WriteLn ('answer the following question with Y. However, this might not work correctly');
WriteLn ('under some conditions (e.g. for long names and drives not supporting them).');
Write (#13#10'Do you want to continue now (y/N)? ');
ReadLn (C);
if UpCase (C) = 'Y' then FileUnzipEx := TFileUnzipEx (@Unzip51g.FileUnzipEx) else Halt (255);
end;
end.
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