CRC16

Program that calculates the CRC-16 value for a given file and which can also verify the correctness of a given file that already has a CRC-16 value appended to it,

Author: Ganesh Pandey

Usage

Used CRC polynomial:

x^16+x^10+x^8+x^7+x^3+1

Program operation:

1. The program compile from the command line.
2. Take two (2) command line parameters.
3. The first command line parameter will be a flag value that identifies the mode of operation: “c” for calculating a CRC value, or “v” for verifying a CRC value.
4. The second command line parameter will be the name of the file to be examined. The file should be a text file that is in the same folder as the program executable.

clone Repo

$ git clone https://github.com/GPandey515/CRC16.git

compile and Run

$ javac Crcheck.java

$ java Crcheck c file.txt // checksum calculate

$ java Crcheck v file.crc // checksum verification

Warning:

Valid input files will be ASCII files that contain printable data.The raw input file will consist of ASCII data of varying length up to 512 bytes, with the last 8 bytes reserved for the checksum. (Note: The CRC or checksum will be a 16 bit integer, or 4 hexadecimal digits, which will fill the last 4 bytes/characters, the leading 4 characters should be zeroes.)

Note: This program is provided 'AS IS', without warranty of any kind, so use it at your own risk.