Contributor: STEVE WIERENGA
{
Author: Steve Wierenga
LZH Viewer
}
Unit Lzhv;
(**) Interface (**)
Uses
Dos,Crt;
Type
FileheaderType = Record { Lzh File header }
Headsize,
Headchk : Byte;
HeadID : packed Array[1..5] of Char;
Packsize,
Origsize,
Filetime : LongInt;
Attr : Word;
Filename : String[12];
f32 : PathStr;
dt : DateTime;
end;
Var
Fh : FileheaderType;
Fha : Array[1..sizeof(FileheaderType)] of Byte Absolute fh;
crc : Word; { CRC value }
crcbuf : Array[1..2] of Byte Absolute CRC;
crc_table : Array[0..255] of Word; { Table of CRC's }
inFile : File; { File to be processed }
registered : Boolean; { Is registered? }
Procedure Make_crc_table; { Create table of CRC's }
Function Mksum : Byte; { Get CheckSum }
Procedure ViewLzh(LZHFile : String); { View the File }
Function GAN(LZHFile : String) : String; { Get the LZH Filename }
(**) Implementation (**)
Procedure Terminate; { Exit the Program }
begin
Write('ARCHPEEK could not find specified File. Aborting...');
Halt;
end;
Procedure Make_crc_table;
Var
i,
index,
ax : Word;
carry : Boolean;
begin
index := 0;
Repeat
ax := index;
For i := 1 to 8 do
begin
carry := odd(ax);
ax := ax shr 1;
if carry then
ax := ax xor $A001;
end;
crc_table[index] := ax;
inc(index);
Until index > 255;
end;
{ use this to calculate the CRC value of the original File }
{ call this Function afer reading every Byte from the File }
Procedure calccrc(data : Byte);
Var
index : Integer;
begin
crcbuf[1] := crcbuf[1] xor data;
index := crcbuf[1];
crc := crc shr 8;
crc := crc xor crc_table[index];
end;
Function Mksum : Byte; {calculate check sum For File header }
Var
i : Integer;
b : Byte;
begin
b := 0;
For i := 3 to fh.headsize+2 do
b := b+fha[i];
mksum := b;
end;
Procedure viewlzh(LZHFile : String); { View the LZH File }
Var
l1,l2,
oldFilepos,
a,b,a1,b1,
totalorig,
totalpack : LongInt;
count,z : Integer;
numread,
i, year1,
month1,
day1,
hour1,
min1,
sec1 : Word;
s1 : String[50];
s2 : String[20];
l : String[80];
sss : String;
begin
registered := False; { Unregistered }
if not registered then { Registered? }
begin
Writeln('ArchPeek 0.01Alpha [UNREGISTERED] Copyright 1993 Steve Wierenga');
Delay(200);
end;
assign(inFile,LZHFile);
{$I-}
reset(inFile,1); { Open LZH File }
{$I+}
If IOResult <> 0 then
Terminate; { Specified File exists? }
sss := GAN(LZHFile); { Get Filename of LZH File }
Writeln( 'Lzh FileName: ',sss);
WriteLn( ' Name Length Size Saved Date Time ');
WriteLn('__________________________________________________________');
oldFilepos := 0; { Init Variables }
count := 1;
z := 0;
a1 := 0;
Repeat
z := z + 1;
seek(inFile,oldFilepos); {
Goto start of File}
blockread(inFile,fha,sizeof(FileheaderType),numread); {
Read Fileheader}
oldFilepos := oldFilepos+fh.headsize+2+fh.packsize; {
Where are we? }
i := Mksum; { Get the checksum }
if fh.headsize <> 0 then
begin
if i <> fh.headchk then
begin
Writeln('Error in File. Unable to read. Aborting...');
Close(inFile);
Exit;
end;
Case Length(Fh.FileName) Of { Straigthen out String }
1 : Fh.FileName := Fh.FileName + ' ';
2 : Fh.FileName := Fh.FileName + ' ';
3 : Fh.FileName := Fh.FileName + ' ';
4 : Fh.FileName := Fh.FileName + ' ';
5 : Fh.FileName := Fh.FileName + ' ';
6 : Fh.FileName := Fh.FileName + ' ';
7 : Fh.FileName := Fh.FileName + ' ';
8 : Fh.FileName := Fh.FileName + ' ';
9 : Fh.FileName := Fh.FileName + ' ';
10 : Fh.FileName := Fh.FileName + ' ';
11 : Fh.FileName := Fh.FileName + ' ';
12 : Fh.FileName := Fh.FileName + '';
end;
UnPackTime(Fh.FileTime,Fh.DT);
a1 := a1 + Fh.OrigSize; { Increase Uncompressed Size }
Write(' ', fh.Filename : 2, fh.origsize : 9, fh.packSize : 10,
(100 - fh.packSize / fh.origSize * 100) : 5 : 0, '%');
{ Display info }
Case fh.dt.month of { Get date and time }
1..9 : Write( '0':4,fh.dt.month);
10..12 : Write( ' ',fh.dt.month:4);
end;
Write( '/');
Case fh.dt.day of
1..9 : Write( '0',fh.dt.day);
10..31 : Write( fh.dt.day);
end;
Write( '/');
Case fh.dt.year of
1980 : Write( '80');
1981 : Write( '81');
1982 : Write( '82');
1983 : Write( '83');
1984 : Write( '84');
1985 : Write( '85');
1986 : Write( '86');
1987 : Write( '87');
1988 : Write( '88');
1989 : Write( '89');
1990 : Write( '90');
1991 : Write( '91');
1992 : Write( '92');
1993 : Write( '93');
1994 : Write( '94');
1995 : Write( '95');
1996 : Write( '96');
end;
Case fh.dt.hour of
0..9 : Write( '0':3,fh.dt.hour,':');
10..23 : Write( ' ',fh.dt.hour:3,':');
end;
Case fh.dt.min of
0..9 : Write( '0',fh.dt.min,':');
10..59 : Write( fh.dt.min,':');
end;
Case fh.dt.sec of
0..9 : Writeln( '0',fh.dt.sec);
10..59 : Writeln( fh.dt.sec);
end;
end;
Until (fh.headsize=0);
Writeln( '===========================================================');
GetFTime(inFile,l1);
UnPackTime(l1,fh.dt);
Write( ' ', z, ' Files ', a1 : 12, FileSize(inFile) : 10,
(100 - FileSize(inFile) / a1 * 100) : 5 : 0, '%');
Case fh.dt.month of
1..9 : Write( '0':4,fh.dt.month);
10..12 : Write( ' ',fh.dt.month:4);
end;
Write( '/');
Case fh.dt.day of
1..9 : Write( '0',fh.dt.day);
10..31 : Write( fh.dt.day);
end;
Write( '/');
Case fh.dt.year of
1980 : Write( '80');
1981 : Write( '81');
1982 : Write( '82');
1983 : Write( '83');
1984 : Write( '84');
1985 : Write( '85');
1986 : Write( '86');
1987 : Write( '87');
1988 : Write( '88');
1989 : Write( '89');
1990 : Write( '90');
1991 : Write( '91');
1992 : Write( '92');
1993 : Write( '93');
1994 : Write( '94');
1995 : Write( '95');
1996 : Write( '96');
end;
Case fh.dt.hour of
0..9 : Write( '0':3,fh.dt.hour,':');
10..23 : Write( ' ',fh.dt.hour:3,':');
end;
Case fh.dt.min of
0..9 : Write( '0',fh.dt.min,':');
10..59 : Write( fh.dt.min,':');
end;
Case fh.dt.sec of
0..9 : Writeln( '0',fh.dt.sec);
10..59 : Writeln( fh.dt.sec);
end;
end;
Function GAN(LZHFile : String): String;
Var
Dir : DirStr;
Name : NameStr;
Exts : ExtStr;
begin
FSplit(LZHFile,Dir,Name,Exts);
GAN := Name + Exts;
end;
end.