Adler32
Algorithm
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Adler32 Checksum Algorithm

Adler32 is another checksum algorithm that is used as a "quick and dirty" version of the CRC32 algorithm (it was developed by Mark Adler from Fletcher's checksum).
You get a single 32-bit number that represents a block of data (of any size but >128 bytes preferably).
If the data changes in any way (even a single bit) the Adler32 calculation would yield a completely different value.

Usage:
  int Adler32=CAdler32().From(Buffer,Size);
or use one instance for several Adler32s:
  CAdler32 Adler32;
  int Adler32a=Adler32.From(Buffer1,Size1);
  int Adler32b=Adler32.From(Buffer2,Size2);
or if reading a file in blocks:
  CAdler32 Adler32;
  while(Read(Buffer, Size)) Adler32.From(Buffer, Size, true);
  int MyAdler32=Adler32.GetAdler32();
Test Vectors used in the tester are generated from the RFC1950 C implementation. There are no official test vectors.

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 (3029) Last modified: Tue, 03 Feb 2009 18:26:33 +0000