elazarl’s gists

elazarl / jc-lsusb.py

Last active August 12, 2024 07:19

just the lsub portion of jc from https://github.com/kellyjonbrazil/jc

	# from utils.py

	"""jc - JSON Convert utils"""

	import sys
	import re
	import locale
	import shutil
	from itertools import islice
	from collections import namedtuple

elazarl / fastapi-posgresql.py

Last active June 15, 2024 20:00

An example how to combine async fastapi server with async psycopg

	#!/usr/bin/env python3

	# to run use:
	# $ fastapi dev fastapi-posgresql.py
	from contextlib import asynccontextmanager
	from typing import Annotated, AsyncGenerator

	import psycopg
	from psycopg_pool import AsyncConnectionPool

elazarl / sprint_int.c

Last active May 9, 2023 08:20

Small standalone stupid function to convert integer value to string, for code with zero library support

	#include <stdint.h>
	#include <stdio.h>
	char sprint_int_(char out, uint64_t a, uint64_t base) {
	char itoc[] = "0123456789abcdef";
	char *orig_out = out;
	uint64_t a_ = a;
	int i = 0;
	while (a_ >= base) {
	a_ /= base;
	i++;

elazarl / stack_size.c

Last active April 12, 2020 13:27

This is a demonstration showing how to print stack size of a certain function

	// We demonstrate how to get the stack usage of a function
	// using the __builtin_frame_address function of GCC and clang.
	//
	// This function returns:
	// The frame is the area on the stack that holds local variables and saved registers.
	// The frame address is normally the address of the first word pushed on to
	// the stack by the function.
	//
	// by saving its value and comparing it to a callee, we get the stack usage of this
	// function.

elazarl / simple_transform_before_zstd.c

Created January 30, 2020 15:35

Check if a simple transform before applying zstd reduce file size

elazarl / bench_comp_decomp.py

Last active January 29, 2020 14:57

Measures compression and decompression speed and size ratio on many files

	#!/usr/bin/python3
	import argparse
	from collections import namedtuple
	import csv
	import os
	import shutil
	import subprocess
	import statistics
	import re

elazarl / test_vec_to_c.py

Last active January 26, 2020 21:59

NIST test vector to C format

	# This converts test vectors from
	# https://csrc.nist.gov/Projects/cryptographic-algorithm-validation-program/CAVP-TESTING-BLOCK-CIPHER-MODES
	# to a C-struct format.
	# For example to initialize
	# struct test_case {
	# int count;
	# int data_unit_len;
	# std::string key;
	# std::string index;
	# std::string plaintext;

elazarl / uuid4sym.py

Last active May 16, 2019 05:12

replace UUID with distinguishable emojis

	#!/usr/bin/python3
	# -- coding: utf-8 --
	"""uuid4sym - replace UUID version 4 to an easily distinguishable symbol

	When looking at a long log file with some UUID4 uuids, you'll have a hard time
	distinguishing between two UUIDs.

	Both 26cb1b84-7748-11e9-9437-2bf0efaa1b2e and 2725e8de-7748-11e9-a9c8-f3e5d10ab3d6
	looks similar to the human eye.

elazarl / dir2img.py

Created April 30, 2019 14:11

Create an image with filesystem, copies a local directory content to it

	#!/usr/bin/python3
	"""Create image from a directory

	This script creates image whose contents are a given directoy on the filesystem.

	Example usage:

	$ mkdir mydir
	$ echo A > mydir/a
	$ ./dir2img.py -d mydir -i myimage.img

elazarl / ftrace_event_parser.py

Last active November 14, 2018 09:00

	#!/usr/bin/python3
	import re
	import io

	class FtraceEventParser(object):
	"""FTraceEventParser parses the text form of a single event
	to a tuple of all the event's arguments.

	Example usage:

Elazar Leibovich elazarl