This repo is comprised of implementations for the two most popular Lempel-Ziv algorithms: LZ78 and LZW.
Each implementation is comprised of two programs, encode and decode,
which perform compression and decompression, respectively. Each implementation
utilizes variable code bitwidths, where the maximum bitwidth for a code is 16.
It is, however, very easy to change the maximum bitwidth by going into each
implementation's util.h file and changing the value of the MAX
macro.
To build both the encoder and decoder for each implementation:
$ make all
Or
$ make
To build just the encoder:
$ make encode
To build just the decoder:
$ make decode
To compress a file (stdin and stdout are the default input and
output, respectively):
$ ./encode [-i input] [-o output]
To decompress a file (stdin and stdout are the default input and
output, respectively):
$ ./decode [-i input] [-o output]
Both the encoder and decoder support the command-line options below.
'-h': Display program usage and help
'-v': Display statistics on compression/decompression
To run benchmarks on all implementations, install Pilot, head into the
benchmarks directory, and run:
$ ./benchmark.sh
The Pilot framework can be found here: https://ascar.io/pilot.
Copyright 2020 Eugene Chou
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
For him that stealeth this code and name it as his own let it change to a serpent in his hand and rend him. Let him be struck with palsy, and all his members wither. Let him languish in pain, crying aloud for mercy and let there be no surcease to his agony till he sink to dissolution. Let worms gnaw his entrails in token of the worm that dieth not, and when at last he goeth to his final punishment let the flames of Hell consume him.