id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7098	CRC: Initial values should not be reflected	Dave Vasilevsky <dave@…>	Daryle Walker	"The CRC classes have a parameter 'ReflectIn', which affects whether the message data is reflected. It also causes the initial remainder of the CRC to be reflected, and that's probably incorrect. This has likely remained undetected 'til now because all the included presets use bit-palindromic initial remainders.

LVM2 uses a non-palindromic initial remainder, so I've used its code for a test case. You can see that both LVM's calc_crc() and zlib's crc32() don't reflect the initial remainder. It's evident that boost's crc does, and that no obvious change in template parameters yields the same behaviour as LVM and zlib.

Tested in both clang++ 3.1 and g++ 4.2."	Bugs	new	To Be Determined	crc	Boost Development Trunk	Problem			dwalker