FM / zlib

/usr/lib64/python2.7/Demo/zlib

Name	Size	Mode	Actions
minigzip.py	4304	0755	edit dl rm
minigzip.pyc	3645	0644	edit dl rm
minigzip.pyo	3645	0644	edit dl rm
zlibdemo.py	1469	0755	edit dl rm
zlibdemo.pyc	1243	0644	edit dl rm
zlibdemo.pyo	1243	0644	edit dl rm

Edit: /usr/lib64/python2.7/Demo/zlib/zlibdemo.py (1469B)

#! /usr/bin/python2.7

# Takes an optional filename, defaulting to this file itself.
# Reads the file and compresses the content using level 1 and level 9
# compression, printing a summary of the results.

import zlib, sys

def main():
    if len(sys.argv) > 1:
        filename = sys.argv[1]
    else:
        filename = sys.argv[0]
    print 'Reading', filename

f = open(filename, 'rb')           # Get the data to compress
    s = f.read()
    f.close()

# First, we'll compress the string in one step
    comptext = zlib.compress(s, 1)
    decomp = zlib.decompress(comptext)

print '1-step compression: (level 1)'
    print '    Original:', len(s), 'Compressed:', len(comptext),
    print 'Uncompressed:', len(decomp)

# Now, let's compress the string in stages; set chunk to work in smaller steps

chunk = 256
    compressor = zlib.compressobj(9)
    decompressor = zlib.decompressobj()
    comptext = decomp = ''
    for i in range(0, len(s), chunk):
        comptext = comptext+compressor.compress(s[i:i+chunk])
    # Don't forget to call flush()!!
    comptext = comptext + compressor.flush()

for i in range(0, len(comptext), chunk):
        decomp = decomp + decompressor.decompress(comptext[i:i+chunk])
    decomp=decomp+decompressor.flush()

print 'Progressive compression (level 9):'
    print '    Original:', len(s), 'Compressed:', len(comptext),
    print 'Uncompressed:', len(decomp)

if __name__ == '__main__':
    main()

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