1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:
76:
77:
78:
79:
80:
81:
82:
83:
84:
85:
86:
87:
88:
89:
90:
91:
92:
93:
94:
95:
96:
97:
98:
99:
100:
101:
102:
103:
104:
105:
106:
107:
108:
109:
110:
111:
112:
113:
114:

function CompressFiles(RootFolder : PChar; const Archivname : PCHar): integer; stdcall;
var
  infile, outfile, tmpFile : TFileStream;
  compr : TZCompressionStream;
  i,l,l1: Integer;
  s : String;
  Files: TStringList;

begin
  try {except}
    Files := TStringList.Create;
    try {finally}
      FindAllFiles(Files, RootFolder);

      if Files.Count > 0 then
      begin
        outFile := TFileStream.Create(Archivname,fmCreate);
        try
          { the number of files }
          l := Files.Count;
          outfile.Write(l,SizeOf(l));
          for i := 0 to Files.Count-1 do
          begin
            infile := TFileStream.Create(RootFolder + Files[i],fmOpenRead);
            try
              { the original filesize }
              l := infile.Size;
              { the original filename }
              s := Files[i];
              l1 := Length(s);
              outfile.Write(l1,SizeOf(l1));
              outfile.Write(s[1],l1);
              outfile.Write(l,SizeOf(l));
              { compress and store the file temporary}
              tmpFile := TFileStream.Create('tmp',fmCreate);
              compr := TZCompressionStream.Create(tmpfile, zcMax);
              try
                compr.CopyFrom(infile,l);
              finally
                compr.Free;
                tmpFile.Free;
              end;
              
              tmpFile := TFileStream.Create('tmp',fmOpenRead);
              try
                outfile.CopyFrom(tmpFile,0);
              finally
                tmpFile.Free;
              end;
            finally
              infile.Free;
            end;
          end;
        finally
          outfile.Free;
        end;
        DeleteFile('tmp');
      end;
    finally
      Files.Free;
    end;

    Result := 0;
  except
    Result := 1;
  end;
end;

function DecompressFile(const Filename, DestDirectory : PChar):integer; stdcall;
var
  dest,s, dir : String;
  decompr : TZDecompressionStream;
  infile, outfile : TFilestream;
  i,l,c : Integer;

begin
  try {except}    
    dest := IncludeTrailingPathDelimiter(DestDirectory);

    infile := TFileStream.Create(Filename,fmOpenRead);
    try
      { number of files }
      infile.Read(c,SizeOf(c));
      for i := 1 to c do
      begin
        { read filename }
        infile.Read(l,SizeOf(l));
        SetLength(s,l);
        infile.Read(s[1],l);
        { read filesize }
        infile.Read(l,SizeOf(l));
        { decompress the files and store it }
        s := dest+s; //include the path
        s := StringReplace(s, '\\', '\',[rfReplaceAll]);
        dir := ExtractFilePath(s);
        ForceDirectories(dir);
        outfile := TFileStream.Create(s,fmCreate);
        decompr := TZDecompressionStream.Create(infile);
        try
          outfile.CopyFrom(decompr,l);
        finally
          outfile.Free;
          decompr.Free;
        end;
      end;
    finally
      infile.Free;
    end;

    Result := 0;
  except
    Result := 1;
  end;
end;					

1:

outfile.CopyFrom(decompr,l);