archarc.pas

{/////////////////////////////////////////////////////////////////////////
//
//  Dos Navigator Open Source 1.51.08
//  Based on Dos Navigator (C) 1991-99 RIT Research Labs
//
//  This programs is free for commercial and non-commercial use as long as
//  the following conditions are aheared to.
//
//  Copyright remains RIT Research Labs, and as such any Copyright notices
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//  Labs of the parts of the library used. This can be in the form of a textual
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//  provided with the package.
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//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
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//  1. Redistributions of source code must retain the copyright
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//////////////////////////////////////////////////////////////////////////}
{$I STDEFINE.INC}
unit archARC; {ARC}

interface

uses
  Archiver, Advance, Advance1, Defines, Objects2, Streams
  ;

type
  PARCArchive = ^TARCArchive;
  TARCArchive = object(TARJArchive)
    constructor Init;
    procedure GetFile; virtual;
    function GetID: Byte; virtual;
    function GetSign: TStr4; virtual;
    end;

type
  ARCHdr = record
    Mark: Byte;
    Version: Byte;
    Name: array[1..13] of Char;
    PackedSize: LongInt;
    Date: LongInt;
    CRC: AWord;
    OriginSize: LongInt;
    end;

implementation

{ ----------------------------- ARC ------------------------------------}

constructor TARCArchive.Init;
  var
    Sign: TStr5;
    q: String;
  begin
  Sign := GetSign;
  SetLength(Sign, Length(Sign)-1);
  Sign := Sign+#0;
  FreeStr := SourceDir+DNARC;
  TObject.Init;
  Packer := NewStr(GetVal(@Sign[1], @FreeStr[1], PPacker, 'PAK'));
  UnPacker := NewStr(GetVal(@Sign[1], @FreeStr[1], PUnPacker, 'PAK'));
  Extract := NewStr(GetVal(@Sign[1], @FreeStr[1], PExtract, 'E'));
  ExtractWP := NewStr(GetVal(@Sign[1], @FreeStr[1], PExtractWP, 'E /WA'));
  Add := NewStr(GetVal(@Sign[1], @FreeStr[1], PAdd, 'A'));
  Move := NewStr(GetVal(@Sign[1], @FreeStr[1], PMove, 'A /M'));
  Delete := NewStr(GetVal(@Sign[1], @FreeStr[1], PDelete, 'D'));
  Garble := NewStr(GetVal(@Sign[1], @FreeStr[1], PGarble, '/G'));
  Test := NewStr(GetVal(@Sign[1], @FreeStr[1], PTest, 'T'));
  IncludePaths := NewStr(GetVal(@Sign[1], @FreeStr[1], PIncludePaths, ''));
  ExcludePaths := NewStr(GetVal(@Sign[1], @FreeStr[1], PExcludePaths, ''));
  ForceMode := NewStr(GetVal(@Sign[1], @FreeStr[1], PForceMode, ''));
  RecoveryRec := NewStr(GetVal(@Sign[1], @FreeStr[1], PRecoveryRec, ''));
  SelfExtract := NewStr(GetVal(@Sign[1], @FreeStr[1], PSelfExtract,
         '/EXE'));
  Solid := NewStr(GetVal(@Sign[1], @FreeStr[1], PSolid, ''));
  RecurseSubDirs := NewStr(GetVal(@Sign[1], @FreeStr[1],
         PRecurseSubDirs, '/I'));
  SetPathInside := NewStr(GetVal(@Sign[1], @FreeStr[1], PSetPathInside,
         ''));
  StoreCompression := NewStr(GetVal(@Sign[1], @FreeStr[1],
         PStoreCompression, ''));
  FastestCompression := NewStr(GetVal(@Sign[1], @FreeStr[1],
         PFastestCompression, '/C'));
  FastCompression := NewStr(GetVal(@Sign[1], @FreeStr[1],
         PFastCompression, '/S'));
  NormalCompression := NewStr(GetVal(@Sign[1], @FreeStr[1],
         PNormalCompression, '/ZS /BUGS'));
  GoodCompression := NewStr(GetVal(@Sign[1], @FreeStr[1],
         PGoodCompression, '/CR'));
  UltraCompression := NewStr(GetVal(@Sign[1], @FreeStr[1],
         PUltraCompression, '/O'));
  ComprListChar := NewStr(GetVal(@Sign[1], @FreeStr[1], PComprListChar,
         '@'));
  ExtrListChar := NewStr(GetVal(@Sign[1], @FreeStr[1], PExtrListChar,
       '@'));

  q := GetVal(@Sign[1], @FreeStr[1], PAllVersion, '0');
  AllVersion := q <> '0';
  q := GetVal(@Sign[1], @FreeStr[1], PPutDirs, '0');
  PutDirs := q <> '0';
  {$IFNDEF DPMI32}
  q := GetVal(@Sign[1], @FreeStr[1], PShortCmdLine, '1');
  ShortCmdLine := q <> '0';
  {$ELSE}
  q := GetVal(@Sign[1], @FreeStr[1], PSwapWhenExec, '0');
  SwapWhenExec := q <> '0';
  {$ENDIF}
  {$IFNDEF OS2}
  q := GetVal(@Sign[1], @FreeStr[1], PUseLFN, '0');
  UseLFN := q <> '0';
  {$ENDIF}
  end { TARCArchive.Init };

function TARCArchive.GetID;
  begin
  GetID := arcARC;
  end;

function TARCArchive.GetSign;
  begin
  GetSign := sigARC;
  end;

procedure TARCArchive.GetFile;
  var
    i: AWord;
    P: ARCHdr;
  begin
  ArcFile^.Read(P, 2);
  if  (P.Mark = $1a {^Z}) and (P.Version <> 0) and (ArcFile^.Status = stOK)
  then
    ArcFile^.Read(P.Name, SizeOf(P)-2);
  if  (P.Version = 0) then
    begin
    FileInfo.Last := 1;
    Exit;
    end;
  if  (ArcFile^.Status <> stOK) then
    begin
    FileInfo.Last := 2;
    Exit;
    end;
  i := 1;
  FileInfo.FName := '';
  while (i < 14) and (P.Name[i] <> #0) do
    begin
    FileInfo.FName := FileInfo.FName+P.Name[i];
    Inc(i);
    end;
  FileInfo.Last := 0;
  FileInfo.Attr := 0;
  FileInfo.USize := P.OriginSize;
  FileInfo.PSize := P.PackedSize;
  FileInfo.Date := (P.Date shr 16) or (P.Date shl 16);
  ArcFile^.Seek(ArcFile^.GetPos+P.PackedSize);
  end { TARCArchive.GetFile };

end.