Package ru.soniir.crccalc

Class AlgoParams

  • public class AlgoParams
extends java.lang.Object
    Representation CRC algorithm parameters Created by anthony on 11.05.2017.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static byte[] testBytes  

    • Constructor Summary

      Constructors 
      Constructor Description
      AlgoParams​(java.lang.String name, int hashSize, long poly, long init, boolean refIn, boolean refOut, long xorOut, long check)
      Create new CRC algorithm

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean equals​(java.lang.Object obj)  
      long getCheck()
      This field is not strictly part of the definition, and, in the event of an inconsistency between this field and the other field, the other fields take precedence.This field is a check value that can be used as a weak validator of implementations of the algorithm.The field contains the checksum obtained when the ASCII string "123456789" is fed through the specified algorithm (i.e. 313233...
      int getHashSize()
      This is hash size.
      long getInit()
      This parameter specifies the initial value of the register when the algorithm starts.This is the value that is to be assigned to the register in the direct table algorithm.
      java.lang.String getName()
      This is a name given to the algorithm.
      long getPoly()
      This parameter is the poly.
      long getXorOut()
      This is an W-bit value that should be specified as a hexadecimal number.It is XORed to the final register value (after the REFOUT) stage before the value is returned as the official checksum.
      int hashCode()  
      boolean isRefIn()
      This is a boolean parameter.
      boolean isRefOut()
      This is a boolean parameter.

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • testBytes

        public static final byte[] testBytes

    • Constructor Detail

      • AlgoParams

        public AlgoParams​(java.lang.String name,
                  int hashSize,
                  long poly,
                  long init,
                  boolean refIn,
                  boolean refOut,
                  long xorOut,
                  long check)
        Create new CRC algorithm
        Parameters:
        name - CRC algorithm name
        hashSize - hash size
        poly - poly number
        init - initial value of the CRC algorithm
        refIn - input bytes are processed
        refOut - final register value is reflected first
        xorOut - value is XORed to the final register value
        check - CRC value for new byte[]{'1','2','3','4','5','6','7','8','9'}

    • Method Detail

      • getName

        public java.lang.String getName()
        This is a name given to the algorithm. A string value.
        Returns:
        CRC algorithm name

      • getHashSize

        public int getHashSize()
        This is hash size.
        Returns:
        hash size

      • getPoly

        public long getPoly()
        This parameter is the poly. This is a binary value that should be specified as a hexadecimal number.The top bit of the poly should be omitted.For example, if the poly is 10110, you should specify 06. An important aspect of this parameter is that it represents the unreflected poly; the bottom bit of this parameter is always the LSB of the divisor during the division regardless of whether the algorithm being modelled is reflected.
        Returns:
        poly number

      • getInit

        public long getInit()
        This parameter specifies the initial value of the register when the algorithm starts.This is the value that is to be assigned to the register in the direct table algorithm. In the table algorithm, we may think of the register always commencing with the value zero, and this value being XORed into the register after the N'th bit iteration. This parameter should be specified as a hexadecimal number.
        Returns:
        initial value of the CRC algorithm

      • isRefIn

        public boolean isRefIn()
        This is a boolean parameter. If it is TRUE, input bytes are processed with bit 7 being treated as the most significant bit (MSB) and bit 0 being treated as the least significant bit.If this parameter is FALSE, each byte is reflected before being processed.
        Returns:
        input bytes are processed

      • isRefOut

        public boolean isRefOut()
        This is a boolean parameter. If it is set to FALSE, the final value in the register is fed into the XOROUT stage directly, otherwise, if this parameter is TRUE, the final register value is reflected first.
        Returns:
        final register value is reflected first

      • getXorOut

        public long getXorOut()
        This is an W-bit value that should be specified as a hexadecimal number.It is XORed to the final register value (after the REFOUT) stage before the value is returned as the official checksum.
        Returns:
        value is XORed to the final register value

      • getCheck

        public long getCheck()
        This field is not strictly part of the definition, and, in the event of an inconsistency between this field and the other field, the other fields take precedence.This field is a check value that can be used as a weak validator of implementations of the algorithm.The field contains the checksum obtained when the ASCII string "123456789" is fed through the specified algorithm (i.e. 313233... (hexadecimal)).
        Returns:
        CRC value for new byte[]{'1','2','3','4','5','6','7','8','9'}

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object

      • equals

        public boolean equals​(java.lang.Object obj)
        Overrides:
        equals in class java.lang.Object