David Buchanan DavidBuchanan314

🌍

Hack the planet!

aka retr0id

DavidBuchanan314 / carsync.py

Created October 23, 2025 01:50

	import sys
	from typing import BinaryIO
	import requests
	import time
	from cbrrr import CID, encode_dag_cbor, decode_dag_cbor
	from atmst.mst.node_store import NodeStore
	from atmst.mst.node_walker import NodeWalker
	from atmst.blockstore.car_file import ReadOnlyCARBlockStore, encode_varint
	from atmst.blockstore import BlockStore, OverlayBlockStore

DavidBuchanan314 / decompress.ts

Last active August 31, 2025 16:41

nistp256 point decompression

	/*
	NOTE: arithnetic here is NOT CONSTANT TIME

	This is mostly ok since we're operating on public keys.
	*/

	const P256_P = BigInt("0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff");
	const P256_A = BigInt("0xffffffff00000001000000000000000000000000fffffffffffffffffffffffc");
	const P256_B = BigInt("0x5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b");
	const P256_N = BigInt("0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551");

DavidBuchanan314 / construct_audit_logs.py

Created July 25, 2025 14:55

	"""
	iterate thru /export jsonlines, shove them into ~~sqlite~~ rocksdb, then pull them out
	again into a new jsonlines where each line is in /log/audit format for one DID

	expects input data in "out.jsonlines"
	"""

	from tqdm import tqdm
	import json
	import aimrocks

DavidBuchanan314 / vxworks_help.txt

Created March 10, 2025 17:45

	No ethernet available
	Adding Xtra Brick Ram @0xa000000, Size = 6291264 - 12 cards.


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	]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
	]]]]]]]]]]] ]]]] ]]]]]]]]]] ]] ]]]] TM
	] ]]]]]]]]] ]]]]]] ]]]]]]]] ]] ]]]]
	]] ]]]]]]] ]]]]]]]] ]]]]]] ] ]] ]]]]

DavidBuchanan314 / very_equal.py

Created January 20, 2025 14:52

	import unsafe # https://github.com/DavidBuchanan314/unsafe-python

	mem = unsafe.getmem()

	def very_equal(a: int, b: int) -> None:
	addr = id(a)
	mem[addr+24:addr+32] = b.to_bytes(8, "little")

	very_equal(2 + 2, 5)

DavidBuchanan314 / demo.py

Last active December 6, 2024 18:21

magically import magic number constants (edit: moved to github https://github.com/DavidBuchanan314/magic-numbers (and pypi(!)))

	from magic_numbers import FORTY_TWO, SIXTY_NINE, FOUR_HUNDRED_AND_TWENTY
	from magic_numbers import ONE_THOUSAND_THREE_HUNDRED_AND_TWELVE

	print(f"{FORTY_TWO = }")
	print(f"{SIXTY_NINE = }")
	print(f"{FOUR_HUNDRED_AND_TWENTY = }")
	print(f"{ONE_THOUSAND_THREE_HUNDRED_AND_TWELVE = }")

DavidBuchanan314 / phc_string.py

Created December 3, 2024 06:54

	# https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md

	import re
	import base64

	PHC_STRING_RE = re.compile(r"""
	\$(?P<id>[a-z0-9-]{1,32})
	(\$v=(?P<version>[0-9]+))?
	(\$(?P<params>[a-z0-9-]{1,32}=[a-zA-Z0-9/+.-=,]*))? # NOTE: full param parse happens later, this just checks at least one param exists
	(

DavidBuchanan314 / indentless_exceptions.py

Last active December 1, 2024 06:50

	[
	(try_except := (lambda fn, exception_callback:
	type("mycontext", (__import__("contextlib").ContextDecorator,), {
	"__enter__": lambda self: self,
	"__exit__": lambda self, a, b, c: (a and exception_callback(a, b, c)) or True
	})()(fn)()
	)),

	(throw := lambda e:
	(_ for _ in ()).throw(e)

DavidBuchanan314 / aoc_2024_01.py

Last active December 1, 2024 06:50

DavidBuchanan314 / arch-chroot-kindle.sh

Created November 23, 2024 19:24

arch-chroot from the arch-install-scripts package, hacked up to work from a kindle

	#!/bin/bash
	# SPDX-License-Identifier: GPL-2.0-only

	shopt -s extglob

	unshare=0
	keepresolvconf=0

	#!/hint/bash
	# SPDX-License-Identifier: GPL-2.0-only