Utilities

class chapter10.util.BitFormat(src, byteswap=None)

Bitstruct wrapper that allows for compiling from readable format strings.

Parameters:

• src (str) – “struct” like format with newline separated pairs of <fmt>, <name> where fmt is a bitstruct format string (generally as “<bitsize>”) and name is the attribute name to use.

• byteswap (str) – Optional bitstruct style byteswap description. See bitstruct docs

Value byteswap:

None

fmt_str: string

The original format string.

names: list

A list of the field names from the format string.

unpack(data)

Use compiled format to unpack data. Uses self.byteswap if provided.

Parameters:

data (bytes) – Raw data to unpack

Returns dict:

Unpacked values based on compiled format.

class chapter10.util.Buffer(io)

File wrapper that raises EOF on a short read.