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Tip revision: a5f49f5bb46b6b8c7bf1ffedbaf3009186b94b50 authored by Benjamin Peterson on 10 December 2014, 15:57:00 UTC
bump to 2.7.9 final
bump to 2.7.9 final
Tip revision: a5f49f5
zlibdemo.py
#!/usr/bin/env python
# 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()