This is used by Zyxel for the firmware in their GS1900 series switches,
but also shows up in Cisco 220 series.

It's really just the U-Boot header with a different initial magic value.

Also minor cleanup in the U-Boot signature.

Fixed bug in processing internal extractors; if extractor raises an exception, explicitly mark it as failed.

Improved speed of entropy scan by using a list rather than a dictionary for seen values
vastly improved speed with optional numpy/numba implementation

Make it clear that ext/cmd are optional and that the type can be a regular
expression.

Newest squashfs in upstream has supported LZ4 (5) and ZSTD
(6) as compression algorithms. However, they didn't exist in binwalk's
current magic library. This commit added the magic values so that squashfs images
compressed by these algorithms could be successfully identified.

Ref:
https://github.com/torvalds/linux/blob/master/fs/squashfs/squashfs_fs.h
https://github.com/file/file/blob/master/magic/Magdir/filesystems

When running binwalk in non-interactive session some env variables
may not be set. This causes binwalk to fail to correctly determine
user's home directory. This commit fixes that (at least for linux systems).

Ubiquiti firmware images have additional data attached after the Ubiquiti
partition definitions. They are used to convey additional pre-upgrade
information and even firmware signatures (AirOS 6).

Fixed file path bug in extractor.py where file names that are all digits were treated as integers rather than strings

Fixed some ROM signature and extraction bugs; added debug info during file open failures; updated plugins to use file.path instead of file.name

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

Added {end} tag to ISO signatures to prevent scanning inside of the ISO image and producing duplicate extractions