Syntax

   @CRC([REJECTABLE],ALL)
   @CRC([REJECTABLE],(GEOM|ATTRIBUTES)[,<attr1>,...,<attrN>])
   @CRC([REJECTABLE],(GEOM|ATTRIBUTES),(CRC_16_CITT|CRC_16_XMODEM|CRC_16_ARC|CRC_32|CRC_32_Q|MD5)[,<attr1>,...,<attrN>])
   @CRC([REJECTABLE],(GEOM_ENCODED|ATTRIBUTES_ENCODED),(CRC_16_CITT|CRC_16_XMODEM|CRC_16_ARC|CRC_32|CRC_32_Q|MD5)[,<attr1>,...,<attrN>])
   @CRC([REJECTABLE],FILE,(CRC_16_CITT|CRC_16_XMODEM|CRC_16_ARC|CRC_32|CRC_32_Q|MD5)<filePath>)
   
Arguments

   REJECTABLE - for use when this is called from the ExecuteFunctionFactory

   ALL   
      Calculates CRC for all attributes and geometry and returns the CRC value as a string.
      Range: N/A
   
   GEOM  
      Calculates the CRC for the geometry and specified attributes, or only the geometry
      if no attributes are specified.
      If suffix _ENCODED is added then incoming attributes are expected to be FMEParsableText encoded.
      Range: N/A
      
   ATTRIBUTES
      Calculates the CRC for the specified attributes, or all attributes if none specified.  
      If suffix _ENCODED is added then incoming attributes are expected to be FMEParsableText encoded.
      Range: N/A

   FILE
      Calculates the CRC for the specified file.  Incoming file name is expected to be FMEParsableText encoded.

      Range: N/A

   <attrN>
   
      The attributes to calculate the CRC for.
      
      Range: Attribute Name

   <filePath>
      The FMEParsableText path to the specified file to calculate CRC for.
      Range: String

   CRC_16_CCITT_FALSE

      16 bit algorithm
      Width  : 16
      Poly   : 1021
      Init   : FFFF
      RefIn  : False
      RefOut : False
      XorOut : 0000
   
   CRC_16_XMODEM

      16 bit algorithm
      Width  : 16
      Poly   : 1021
      Init   : 0000
      RefIn  : False
      RefOut : False
      XorOut : 0000

   CRC_16_ARC
   
      16 bit algorithm
      Width  : 16
      Poly   : 8005
      Init   : 0000
      RefIn  : True
      RefOut : True
      XorOut : 0000

   CRC_32
   
      32 bit algorithm
      Width  : 32
      Poly   : 04C11DB7
      Init   : FFFFFFFF
      RefIn  : True
      RefOut : True
      XorOut : FFFFFFFF

   CRC_32_Q
      
      32 bit algorithm
      Width  : 32
      Poly   : 741B8CD7
      Init   : FFFFFFFF
      RefIn  : True
      RefOut : True
      XorOut : FFFFFFFF

   MD5

      This algorithm is used to get MD5 checksums.

Description

   This function is used to calculate a CRC value for geometry coordinates, selected 
   attributes, both as described above, or selected file.

   The CRC is returned as a hex-string representing an integer of double the bit-length 
   of the chosen algorithm if the crc was calculated for both coordinates and attributes, 
   and a hex-string representing an integer equal to the algorithm bit-length if the crc 
   was calculated for only geometry coordinates, only attributes, or file. 

   In the case where the crc of both coordinates and attributes is being calculated,
   the format of the crc attribute string is "xxxxxxxxyyyyyyyy", where the
   x's represent the crc calculated for the coordinates, and the y's represent 
   the crc calculated for the combination of the coordinates and attributes.
   The first half of the crc (the x's) in this case will match the entire crc of
   calculating only the geometry coordinates. The second half of the crc (the y's)
   will not match the entire crc of calculating only attributes.

   MD5 checksums do not follow this pattern and are instead returned as
   a 32 digit hex-string which is calculated based on the entire input.