determine archive filetype (NOT SUITABLE FOR ACTUAL USE / THIS IS EDUCATIONAL ONLY)

determine an archive's filetype using common magic bytes (file signatures)

this is a very crude alternative to using python-magic, and libmagic that i used for learning purposes

included magic bytes (file signatures)

signature	extension	description
\x89\x50\x4e\x47\x0d\x0a\x1a\x0a	png	portable network graphics format
\x7b\x5c\x72\x74\x66\x31	rtf	rich text format
\x4c\x5a\x49\x50	lz	lzip compressed file
\x37\x7a\xbc\xaf\x27\x1c	7z	7-Zip file format
\xfd\x37\x7a\x58\x5a\x00	xz	XZ compression utility using LZMA2 compression
\x1f\x8b\x08	gz	GZIP compressed file
\x42\x5a\x68	bz2	compressed file using Bzip2 algorithm
\x50\x4b\x03\x04	zip	zip file format and formats based on it like jar, xlsx, docx, apk, etc

requirements

Python v3.2+ because unicode is hard

status

development

example

$ python3 ./determine_archive_filetype.py
directory: /Users/josh/dev/python/determine-archive-filetype
file: test-doc.rtf, type: rtf
file: .DS_Store, type: no match
file: tar-cjf.tar.gz, type: bz2
file: screenshot.png, type: png
file: test-doc.docx.lz, type: lz
file: test.tar.xz, type: xz
file: test-zip.zip, type: zip
file: test-doc.docx.7z, type: 7z
file: test-doc.docx, type: zip
file: determine_archive_filetype.py, type: likely text
file: tar-zcvf.tar.gz, type: gz

license

project license can be found here