Python Task4ShannonFano Examples

Example #1

File: Task5.py Project: mukunm/asu-spr15-sum16

def getDecompressedData(compressionStrategy, filename):
	decompressedData = []

	if compressionStrategy == 1:
		print "Data present in file is UNCOMPRESSED"
		with open(filename) as f:
			for line in f: # read rest of lines
				decompressedData.append([int(x) for x in line.split()])
			np.savetxt(filename+".decompressed", decompressedData, fmt='%i', delimiter='\t')
		return filename+".decompressed"

	if compressionStrategy == 2:
		return Task4ShannonFano.decompress(filename)
	if compressionStrategy == 3:
		print "Data present in file is compressed using LZW algorithm"
	if compressionStrategy == 4:
		print "Data present in file is compressed using Arithmatic algorithm"

	return decompressedData

Example #2

import Task4ShannonFano

#########################################################################################
#                                   Main                                                #
#########################################################################################

filename = raw_input("Enter TPQ or SPQ file name: ")

print "Select the compression strategy:"
print "Press 1 for No compression"
print "Press 2 for ShannonFano algorithm"
print "Press 3 for LZW algorithm"
print "Press 4 for Arithmatic algorithm"
option = input("Enter choice: ")

if filename.endswith("tpq"):
    targetFilename = filename.replace(".tpq","_"+str(option)+".tpv")
elif filename.endswith("spq"):
    targetFilename = filename.replace(".spq","_"+str(option)+".spv")

if option == 1:
    with open(filename) as f:
        compressedDataList = []
        for line in f: # read rest of lines
            compressedDataList.append([int(x) for x in line.split()])
        np.savetxt(targetFilename, compressedDataList, fmt='%i', delimiter='\t')

elif option == 2:
    Task4ShannonFano.compress(filename)

print "Compressed data from " + filename + " to " + targetFilename