signature

signature is an application which was written on pure C++17. The app splits an input file on blocks of selected size and computes a signature of each block simultaneously (multithreading). The signatures are saved to an output file.

Usage

Usage:
    signature [KEYS]... <INPUT_FILE> <OUTPUT_FILE>

DESCRIPTION
    The application splits the input file on blocks of selected size and computes
    the signature of each block simultaneously. The signatures are saved to
    output file.

KEYS
    -h, --help
        Show this message

    --version
        Print version

    -v, --verbose LEVEL (default: WRN)
        Print information verbosly. Possible values: DBG, INF, WRN, ERR.

    -b, --block-size BLOCK_SIZE (default: 1M)
        The length of the block by which an input file will be splited. Supported
        suffixes: K=KiloByte, M=MegaByte, G=GigaByte. A number without suffix
        is interpreted as KiloBytes.

    -o, --option OPTION
        Set special option:
        * sign_algo=[crc32,md5] (default: md5)
            the signature algorithm
        * threads=NUM (default: as many threads as available)
            the integer number of threads for processing (must be more then 0)
        * log_file=<file path> (default: stdout)
            the log file path

EXAMPLES
    signature input.dat output.dat
    signature -b 32K input.dat output.dat -o threads=5
    signature --block-size 32K input.dat out.dat -o sign_algo=md5 -o threads=5

TODO

1. WARNING: Implement CRC32 algorithm.
2. Write "applocation architecture"
3. Add APP's attribute options:
   • read_buffer_size=BYTES: initial value for read buffer;
   • block_filler=CHAR: the symbol which will be used for filling block if needed;
   • final_stats=BOOL: print some statistics at the end of execution (pools sizes, number of pools, execution time);
   • runtime_stats=BOOL: calculate and print Workers' statistics (microseconds for block processing)