Hachoir is the french name for a mincer: a tool used by butchers to cut
meat. Hachoir is also a tool written for hackers to cut file or any
binary stream. A file is split in a tree of fields where the smallest
field can be just a bit. There are various field types: integer, string,
bits, padding, sub file, etc.

WWW: http://bitbucket.org/haypo/hachoir/wiki/hachoir-core