This is a parallelized implementation of the Huffman coding algorithm that can be used for ultra fast file compression and decompression.

To build and test the project, run the following commands:

  mkdir build && cd build

  cmake ..

  make -j

  make test

Using this file compression tool is simple. To compress a file, provide the name of the file you would like to compress and a name for the compressed file that will be created.

  #include <string>
  #include "concurrent_huffman.h"
  
  int main()
  {
    // The file that is going to be compressed.
    std::string file_to_compress = "my_uncompressed_file.txt";
    // The compressed file created from the original file.
    std::string compressed_file = "my_compressed_file.txt";
    // Compress the file.
    ConcurrentHuffman::compressFile(file_to_compress, compressed_file);
  }

Decompressing a file is similar. To decompress a file, provide a name of the file that you would like to decompress and a name for the decompressed file that will be created.

  #include <string>
  #include "concurrent_huffman.h"
  
  int main()
  {
    // The file that is going to be decompressed.
    std::string file_to_decompress = "my_compressed_file.txt";
    // The decompressed file created from the compressed file.
    std::string decompressed_file = "my_decompressed_file.txt";
    // Decompress the file.
    ConcurrentHuffman::decompressFile(file_to_decompress, decompressed_file);
  }

Note that, in order to decompress a file, the compressed file must have been compressed with this tool.

The compression process was benchmarked using a 1 MB file consisting of various numeric characters. The decompression process was benchmarked using a 470 kB file (the compressed 1 MB file). All benchmarks were ran on an Intel Core i7-8700 processor, which supports up to 12 threads.

  --------------------------------------------------------------------------------
Benchmark                                      Time             CPU   Iterations
--------------------------------------------------------------------------------
BM_Compression/Number of threads:1          62.0 ms         29.9 ms           23
BM_Compression/Number of threads:5          16.2 ms         14.4 ms           49
BM_Compression/Number of threads:10         18.9 ms         18.6 ms           37
BM_Decompression/Number of threads:1         119 ms         11.3 ms           61
BM_Decompression/Number of threads:5        25.9 ms         6.61 ms          106
BM_Decompression/Number of threads:10       19.6 ms         7.80 ms           90