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CRC32 Algorithm

by Ed Preston (3 Submissions)
Category: Files/File Controls/Input/Output
Compatability: Visual Basic 5.0
Difficulty: Advanced
Date Added: Wed 3^rd February 2021
Rating: (7 Votes)

Pure visual basic implementation of the CRC32 (Fletcher) checksum algorithm. Used for detection of data corruption. In short, this class provides an algorithm for computing a unique (sort of) numeric value that represents the composition of a file. For a faster/better method see Adler32 checksum. Note, Fletcher check insensitive to some single byte changes 0 <-> 255.

Inputs
CRC32(ByVal lngCRC32 As Long, ByRef bArrayIn() As Byte, ByVal dblLength As Double) As Long
Assumes
Files size assumed to be less than 2 gig. When passing byte arrays be carefull of the file size. It is best to break the file into chunks and call CRC32 multiple times.

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