Hello,
Somehow Delphi could not link with two functions so here is my solution:
procedure ZlibCompressStreamEx( InStream, OutStream: TStream;
NumLevel: Integer;
StreamType : TZStreamType;
UseDirectOut: boolean;
Sender: TObject;
ProgCallback: TZlibProg;
offset : int64 = 0;
length : int64 = -1); overload;
const
//64 KB buffer
BufSize = 65536;
var
strm : z_stream;
InBuf, OutBuf : PAnsiChar;
UseInBuf, UseOutBuf : boolean;
LastOutCount : integer;
Finished : boolean;
Cancel: boolean;
Totcount: int64;
toRead: integer;
exitLoop: boolean;
procedure WriteOut;
begin
if UseOutBuf then
begin
if LastOutCount > 0 then OutStream.Write(OutBuf^, LastOutCount -
strm.avail_out);
strm.avail_out := BufSize;
strm.next_out := OutBuf;
end
else
begin
if (strm.avail_out = 0) then ExpandStream(OutStream, OutStream.Size +
BufSize);
OutStream.Seek(LastOutCount - strm.avail_out, soFromCurrent);
strm.next_out := DMAOfStream(OutStream, strm.avail_out);
//because we can't really know how much resize is increasing!
end;
LastOutCount := strm.avail_out;
end;
begin
InStream.Seek(offset, soBeginning); // fastream.com May 4 2011
exitLoop := false; // fastream.com May 4 2011
if length = -1 then // fastream.com May 4 2011
length := InStream.Size - offset; // fastream.com May 4 2011
FillChar(strm, sizeof(strm), 0);
InBuf := nil;
OutBuf := nil;
LastOutCount := 0;
Totcount := 0;
strm.next_in := DMAOfStream(InStream, strm.avail_in);
UseInBuf := strm.next_in = nil;
if UseInBuf then
GetMem(InBuf, BufSize);
UseOutBuf := not (UseDirectOut and CanResizeDMAStream(OutStream));
if UseOutBuf then GetMem(OutBuf, BufSize);
ZlibCCheck(deflateInitEx(strm, NumLevel, StreamType)); { V6.01 }
try
repeat
if strm.avail_in = 0 then
begin
if UseInBuf then
begin
toRead := BufSize; // fastream.com May 4 2011
if totCount + BufSize > length then // fastream.com May 4 2011
begin
toRead := length - totCount; // fastream.com May 4 2011
exitLoop := true; // fastream.com May 4 2011
end;
strm.avail_in := InStream.Read(InBuf^, toRead); //
fastream.comMay 4 2011
strm.next_in := InBuf;
end;
if strm.avail_in = 0 then break;
if exitLoop then break;
end;
if strm.avail_out = 0 then WriteOut;
ZlibCCheck(deflate(strm, Z_NO_FLUSH));
if Assigned(ProgCallback) then begin { V6.01 tell user }
Cancel := false;
ProgCallback(Sender, TotCount, Cancel);
if Cancel then break;
end;
inc(Totcount, strm.avail_in); // fastream.com May 4 2011
until false;
repeat
if strm.avail_out = 0 then WriteOut;
Finished := ZlibCCheck(deflate(strm, Z_FINISH)) = Z_STREAM_END;
WriteOut;
until Finished;
if not UseOutBuf then
begin
//truncate when using direct output
OutStream.Size := OutStream.Position;
end;
//adjust position of the input stream
if UseInBuf then
//seek back when unused data
InStream.Seek(-strm.avail_in, soFromCurrent)
else
//simple seek
InStream.Seek(strm.total_in, soFromCurrent);
ZlibCCheck(deflateEnd(strm));
finally
if InBuf <> nil then FreeMem(InBuf);
if OutBuf <> nil then FreeMem(OutBuf);
end;
end;
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* V6.01 }
procedure ZlibCompressStreamEx(InStream, OutStream: TStream; Level:
TCompressionLevel; StreamType: TZStreamType; UseDirectOut: boolean);
overload; // fastream.com May 4 2011
begin
ZlibCompressStreamEx(InStream, OutStream, Levels[Level], StreamType,
UseDirectOut, Nil, Nil,
0, -1);
end;
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*}
procedure ZlibCompressStreamEx( InStream, OutStream: TStream; //
fastream.com May 4 2011
NumLevel: Integer;
StreamType : TZStreamType;
UseDirectOut: boolean;
Sender: TObject;
ProgCallback: TZlibProg); overload;
begin
ZlibCompressStreamEx( InStream, OutStream,
NumLevel,
StreamType,
UseDirectOut,
Sender,
ProgCallback,
0,
-1);
end;
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*}
Please add this to SVN.
Thanks,
SubZero
On Wed, May 4, 2011 at 09:05, Francois PIETTE <[email protected]>wrote:
> Is there any way to set a default value to a parameter in Delphi? In C++
>> it's like (in .h or .hpp header file)
>>
>> void function(int param = value);
>> so the function can now be called as function() without the requirement of
>> expicit param specification.
>>
>
> Same in Delphi.
>
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> http://www.overbyte.be
>
>
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