[Lzip-bug] Selection of CRC32 Polynomial for lzip

[Damir]

Hello!

Have you considered choosing a different polynomial for Crc32 calculation in lzip file format? Some recent CPUs (x86_64 SSE4.2, PowerPC ISA 2.07, ARM v8.1) offer hardware accelerated calculation of CRC32 with a different polynomial (crc32c) than used in lzip (ethernet crc32).

So, picking crc32c poly instead has two benefits:

1) hardware accelerated integrity checking

2) better protection against undetected errors

The downside is the compatibility problem, but changing version byte in file header can help with that.