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PPMD Compress File

Demonstrates how to use the PPMD compression algorithm to compress a file. This code is capable of compressing any size file because the file data is compressed from input to output in a streaming mode. The output file does not contain any "PPMD" header -- it is purely PPMD compressed data.

Download the Chilkat Compression ActiveX here: ChilkatCompression.zip
Unzip and register the DLL with regsvr32. (This is a pre-release)

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
set compress = Server.CreateObject("Chilkat.Compression")

'  Any string argument automatically begins a 30-day trial.
success = compress.UnlockComponent("30-day trial")
If (success <> 1) Then
    Response.Write "Compression component unlock failed" & "<br>"

End If

compress.Algorithm = "ppmd"

success = compress.CompressFile("hamlet.xml","hamletPpmd.dat")
If (success <> 1) Then
    Response.Write compress.LastErrorText & "<br>"

End If

'  Decompress back to the original:
success = compress.DecompressFile("hamletPpmd.dat","hamletInflated.xml")
If (success <> 1) Then
    Response.Write compress.LastErrorText & "<br>"

End If

Response.Write Server.HTMLEncode( "Success!") & "<br>"
%>
</body>
</html>

 

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