The source code is a WDM driver written in DDK that can be read against the previous driver

CharSample_DDK
..............\app
..............\...\CharSample_DDKApp.cpp
..............\...\CharSample_DDKApp.dsp
..............\...\CharSample_DDKApp.h
..............\...\CharSample_DDKApp.rc
..............\...\CharSample_DDKApp.vcproj
..............\...\CharSample_DDKIorw.cpp
..............\...\Makefile
..............\...\resource.h
..............\...\sources
..............\CharSample_DDK.dsw
..............\CharSample_DDK.ncb
..............\CharSample_DDK.opt
..............\CharSample_DDK.sln
..............\CharSample_DDKVars.xml
..............\dirs
..............\driver
..............\......\CharSample_DDK.c
..............\......\CharSample_DDK.cat
..............\......\CharSample_DDK.ctl
..............\......\CharSample_DDK.dsp
..............\......\CharSample_DDK.h
..............\......\CharSample_DDK.inf
..............\......\CharSample_DDK.rc
..............\......\CharSample_DDK.vcproj
..............\......\debug.c
..............\......\iorw.c
..............\......\Makefile
..............\......\pch.h
..............\......\pnp.c
..............\......\power.c
..............\......\queue.c
..............\......\registry.c
..............\......\sources
..............\......\wmi.c
..............\intrface.h
..............\ReadMe.htm

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