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0005_Test for LZH Code.pas
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Pascal/Delphi Source File
|
1993-05-28
|
3KB
|
117 lines
Program LZHTest;
Uses
LZH;
Const
MaxBuf = 4096; { Must be bigger than the biggest chunk being asked For. }
Type
BufType = Array[1..MaxBuf] of Byte;
BufPtr = ^BufType;
Var
InBuf, OutBuf : BufPtr;
inFile, OutFile : File;
s : String;
Bytes_Written : LongInt;
Size : LongInt;
Temp : Word;
{$F+}
Procedure GetBlock(Var Target; NoBytes : Word; Var Actual_Bytes : Word);
Const
Posn : Word = 1;
Buf : Word = 0;
Var
Temp : Word;
begin
if (Posn > Buf) or (Posn + NoBytes > succ(Buf)) then
begin
if Posn > Buf then
begin
blockread(inFile, InBuf^, MaxBuf, Buf);
Write('+');
end
else
begin
move(InBuf^[Posn], InBuf^[1], Buf - Posn);
blockread(inFile, InBuf^[Buf - Posn], MaxBuf - (Buf - Posn), Temp);
Buf := Buf - Posn + Temp;
Write('+');
end;
if Buf = 0 then
begin
Actual_Bytes := 0;
Writeln;
Exit;
end;
Posn := 1;
end;
move(InBuf^[Posn], Target, NoBytes);
inc(Posn, NoBytes);
if Posn > succ(Buf) then
Actual_Bytes := NoBytes - (Posn - succ(Buf))
else Actual_Bytes := NoBytes;
end;
Procedure PutBlock(Var Source; NoBytes : Word; Var Actual_Bytes : Word);
Const
Posn : Word = 1;
Var
Temp : Word;
begin
if NoBytes = 0 then { Flush condition }
begin
blockWrite(OutFile, OutBuf^, pred(Posn), Temp);
Exit;
end;
if (Posn > MaxBuf) or (Posn + NoBytes > succ(MaxBuf)) then
begin
blockWrite(OutFile, OutBuf^, pred(Posn), Temp);
Posn := 1;
end;
move(Source, OutBuf^[Posn], NoBytes);
inc(Posn, NoBytes);
Actual_Bytes := NoBytes;
end;
{$F-}
begin
if (paramcount <> 3) then
begin
Writeln('Usage:lzhuf e(Compression)|d(unCompression) inFile outFile');
halt(1);
end;
s := paramstr(1);
if not(s[1] in ['D', 'E', 'd', 'e']) then
halt(1);
assign(inFile, paramstr(2));
reset(inFile, 1);
assign(OutFile, paramstr(3));
reWrite(OutFile, 1);
new(InBuf);
new(OutBuf);
if (upCase(s[1]) = 'E') then
begin
Size := Filesize(inFile);
blockWrite(OutFile, Size, sizeof(LongInt));
LZHPack(Bytes_Written, GetBlock, PutBlock);
PutBlock(Size, 0, Temp);
end
else
begin
blockread(inFile, Size, sizeof(LongInt));
LZHUnPack(Size, GetBlock, PutBlock);
PutBlock(Size, 0, Temp);
end;
dispose(OutBuf);
dispose(InBuf);
close(inFile);
close(OutFile);
end.