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Compressing text files

Posted on 2000-04-16
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Last Modified: 2010-04-04
Hi can someone please help me
I am thinking of writeing my own little program for compressing text files and just text files nothing else.
Ok so what i want to now is were I might find some projects, tutors, or code. No OCXS,DLLS,LIBARYS as I now were to find ocx,dlls I just want to make my own prgram form basic code
Thanks.
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Question by:dreamvb
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7 Comments
 
LVL 17

Expert Comment

by:inthe
ID: 2721127
Hi,
just look at zlib compression unit in the extras folder of your delphi cd,it also comes with example of compressing files.
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LVL 3

Expert Comment

by:bryan7
ID: 2721478
compressing text with ZLIB:

const
  BufferSize = 4096;

var
  functions: Tfunctions;

  BufferZ: array[0..BufferSize-1] of Byte;
  InFile: TStringStream;
  OutFile: TStringStream;
  ZStream: TCustomZLibStream;

function TFunctions.CompressText(Tex: string): string;
begin
  InFile := TStringStream.Create(Tex);
  try
    OutFile := TStringStream.Create('');
    try
      ZStream := TCompressionStream.Create( clFastest, OutFile);
      try
        ZStream.CopyFrom(InFile, 0);
      finally
        ZStream.Free;
      end;
    finally
    Result:= OutFile.DataString;
      OutFile.Free;
    end;
  finally
    InFile.Free;
  end;
end;

function TFunctions.DeCompressText(Tex: string): string;
var Count: Integer;
begin
  InFile :=  TStringStream.Create(Tex);
  try
    OutFile := TStringStream.Create('');
    try
      ZStream := TDecompressionStream.Create(InFile);
      try
        while True do
          begin
            Count := ZStream.Read(BufferZ, BufferSize);
            if Count <> 0 then OutFile.WriteBuffer(BufferZ, Count) else Break;
          end;
      finally
        ZStream.Free;
      end;
    finally
    Result:= OutFile.DataString;
      OutFile.Free;
    end;
  finally
    InFile.Free;
  end;
end;

-------

with a little changes you can use it also with files.. using TFileStream

---

if you don't want to use zlib and make everything for your own.. you can learn how zlib works..
the only things I can teach you are RLA and HUFFMAN compression..
huffman is quite good
0
 
LVL 7

Accepted Solution

by:
Motaz earned 30 total points
ID: 2721678
I write a compression program in Turbo Pascal 7 then I change it to unit to work with Delphi. It works with every file type, and it has a good compression ration in text files. If you need it please write down your E-Mail.

Motaz
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Expert Comment

by:p0seidon
ID: 2722485
Motaz: can you mail me that unit
p0seidon@extended.de

thx
0
 
LVL 4

Author Comment

by:dreamvb
ID: 2724062
Can you send me that Unit please
 to dreamvb@yahoo.com

  Thanks
       Motaz
0
 
LVL 3

Expert Comment

by:bryan7
ID: 2725231
can i have it too ?

brian7@teleline.es

thanks
0
 
LVL 4

Expert Comment

by:Radler
ID: 2726631
Hi Motaz,

I'm very interested at you original code to turbo pascal. I'm looking for a zip/unzip code  to turbo pascal too. Have it you ?

Thanks, Radler( roger@ars.com.br )
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