import sys
import random
import numpy as np
import PS1bin
import PS13mycode
if __name__ == "__main__":
for maxInput, tableSize in [(2,5), (3,10)]:
print '\n\ntesting with maxInput=%d, tableSize=%d'%(maxInput,tableSize)
iA = range(maxInput)
cA = range(tableSize)
for i in xrange(10):
print '..'
msg = [random.choice(iA) for j in xrange(20)]
cmsg = PS13mycode.compress(msg,maxInput,tableSize)
assert type(cmsg)==type([]), "encoded message not a list"
for x in cmsg:
assert x in cA, "coded message out of range"
dmsg = PS13mycode.uncompress(cmsg,maxInput,tableSize)
assert type(dmsg)==type([]), "decoded message not a list"
for x in dmsg:
assert x in iA, "decoded message out of range"
print msg, '->', cmsg
assert PS1bin.chk3(msg,cmsg,maxInput,tableSize), "incorrect encoding"
print dmsg
assert len(msg)==len(dmsg), "incorrect length after decoding"
for i in xrange(len(msg)):
assert msg[i]==dmsg[i], "incorrect decoding"
print '\n\nGREAT! NO ERRORS FOUND'
import sys
import PS13mycode
if __name__ == "__main__":
nargin = len(sys.argv)
if nargin == 1:
print """
usage:
python PS1lzw.py filename
python PS1lzw.py u filename
"""
else:
filename = sys.argv[1]
input_file = open(filename,'rb')
msg = [ord(x) for x in input_file.read()]
input_file.close()
if nargin == 2:
cmsg = PS13mycode.compress(msg,256,65536)
newmsg = ''.join(["%s%s"%(chr(x/256),chr(x%256)) for x in cmsg])
newfile = filename+'.zl'
else:
cmsg = [256*msg[i]+msg[i+1] for i in xrange(0,len(msg),2)]
umsg = PS13mycode.uncompress(cmsg,256,65536)
newmsg = ''.join([chr(x) for x in umsg])
newfile = filename+'.u'
output_file = open(newfile,'wb')
output_file.write(newmsg)
output_file.close()