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Edit File : zlibdemo.py \| Size : 1.43 KB
#! /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() Back

Edit File : zlibdemo.py | Size : 1.43 KB

#! /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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