Move the CRC computation to its own method so that we can use it elsewhere.
Move the CRC computation to its own method so that we can use it elsewhere.


git-svn-id: a3e1eb16dde062992de22c830ed8045c8013209a@1088 c613c5cb-e716-0410-b11b-feb51c14d237

threerings/vilya,threerings/vilya