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.

The functionality in this example is available in pre-release only:

Download Chilkat Python Library (Pre-Release)

import sys
import chilkat

compress = chilkat.CkCompression()

#  Any string argument automatically begins a 30-day trial.
success = compress.UnlockComponent("30-day trial")
if (success != True):
    print "Compression component unlock failed"
    sys.exit()

compress.put_Algorithm("ppmd")

success = compress.CompressFile("hamlet.xml","hamletPpmd.dat")
if (success != True):
    print compress.lastErrorText()
    sys.exit()

#  Decompress back to the original:
success = compress.DecompressFile("hamletPpmd.dat","hamletInflated.xml")
if (success != True):
    print compress.lastErrorText()
    sys.exit()

print "Success!"