a fast, highly optimized implementation of popular checksum algorithms: crc32, crc16, crc16c (crc-ccitt). the library allows to calculate checksums for files, memory blocks, strings, blobs, streaming data. it is quick, flexible, easy to use. it supports 3 interfaces: fastcrc api (the api can be used as is, or it can be used to create wrappers for languages that can use dll or lib), c++ interface (c++ wrapper classes to fastcrc api), and fastcrc type library (includes all declarations for accessing the functionality from programming languages that can reference a .tlb, such as vb 5.0, vb 6.0, vba, etc). it allows static/dynamic linking. it has no external dependencies such as mfc dlls, com/dcom or other component. the help file has c, c++ and visual basic examples showing how to add checksum calculations to windows applications quickly and easily.