README
GT5F-js
Nodejs (+ Header Only C) library for the GT-521F52, GT-521F32 and GT-511C3(R) fingerprint scanners
It uses the Linux SCSI Driver so no OSX support. It probably also doesn't work on windows, but it could be ported.
Header Only Lib
The header only lib is usb_protoc.h
it will handle the SCSI commands and CRC for you, you only need to provide a file desciptor and the commands/data.
See usb_test.c
and usb_module.cc
for examples.