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arunkthomasuncc/LZWAlgorithm
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Student Details ---------------------------------- ARUN KUNNUMPURAM THOMAS STUDENT ID :801027386 Programming Language details ----------------------------------- Programming Language: JAVA Compiler Version : JAVA 8 Instruction to run program ----------------------------------- LZWEncoder ------------ 1. Go to project folder from command prompt 2. Execute javac LZWEncoder.java 3. Execute java LZWEncoder <inputfilename with extension><bit length> ex: java LZWEncoder input1.txt 12 This will create an output file input1.lzw in the same folder LZWDecoder ------------ 1. Go to project folder from command prompt 2. Execute javac LZWDecoder.java 3. Execute java LZWDecoder <outputfile from LZWEncoder><bit length> ex: java LZWEncoder input1.lzw 12 This will create an output file input1_decoded.txt in the same folder Program Description and data structure details ----------------------------------------------- LZWEncoder.java ---------------- It has mainly three operations 1. Reading the input file 2. Encoding 3. Writing to output file In this program, I am reading the file character by character and passing it to the encoder method. Encoder method is the implementation of LZW compression algorithm. I am using HashMap to represent the dictionary, so that dictionary search will be fast. Iam writing the encoded codes from encoder to outputfile using UTF-16BE encoding. Program will create a .lzw file with name same as input file in the project directory. LZWDecoder.java ---------------- It has mainly three operations 1. Reading the input LZW file 2. Decoding 3. Writing the decoded text to output file In this program, I am reading the LZW file from LZWEncoder using UTF-16BE emcoding and passing the set of integer codes to the decoder method. Decoder method is the implementation of LZW decompression algorithm. I am using HashMap to represent the dictionary, so that dictionary search will be fast. The program will write the decoded text from decoder to a decoded.txt file. Program will create a file with name <inputfilename>_decoded.txt file in the project folder.
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This repository contains the implementation of LZW Encoder and Decoder compressor algorithm
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