Manos Pitsidianakis epilys

Mime and mail related RFCs

RFC 1847 Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted
RFC 2045 Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies
RFC 2046 Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types
RFC 2047 Multipurpose Internet Mail Extensions (MIME) Part Three: Message Header Extensions for Non-ASCII Text
RFC 2049 Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples
RFC 2076 Common Internet Message Headers
RFC 2183 Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field

Each time I re-install a fresh Linux distribution, one of the first things I need to do is to compile the Heirloom Documentation Tools. However some adjustments have to be performed; I write them here in order to recall them later:

download the sources from http://heirloom.sourceforge.net/doctools.html
type: sudo apt-get install g++ libc-dev bison flex
uncompress the tarball
enter the heirloom-doctools directory
edit mk.config and change three lines:
- replace INSTALL=/usr/ucb/install with INSTALL=/usr/bin/install

replace PREFIX=/usr with PREFIX=/opt/heirloom

GCC compiler optimization for ARM-based systems

2017-03-03 fm4dd

The gcc compiler can optimize code by taking advantage of CPU specific features. Especially for ARM CPU's, this can have impact on application performance. ARM CPU's, even under the same architecture, could be implemented with different versions of floating point units (FPU). Utilizing full FPU potential improves performance of heavier operating systems such as full Linux distributions.

-mcpu, -march: Defining the CPU type and architecture

These flags can both be used to set the CPU type. Setting one or the other is sufficient.

(This is a translation of the original article in Japanese by moratorium08.)

(UPDATE (22/3/2019): Added some corrections provided by the original author.)

Writing your own OS to run on a handmade CPU is a pretty ambitious project, but I've managed to get it working pretty well so I'm going to write some notes about how I did it.

IMAP specifications

(TODO) All IANA registered IMAP capabilities, response codes, keywords, mailbox attributes, the most relevant SASL mechanisms, and other relevant specifications.

⛔️: obsolete specifications that have been deprecated or replaced
⏭️: extensions that have been completely or partially included in [IMAP4rev2].
✨: extensions that are recommended for [IMAP4rev2] servers and clients. The IETF EXTRA WG decided that requiring them as a part of IMAP4rev2 would push the bar to implement too high for new implementations.
🗑: extensions that have been completely or partially deprecated or removed in [IMAP4rev2].
🍋: extensions that are included in the "Lemonade" profile [RFC5550].

	#!/usr/bin/env zsh

	# This script prints a bell character when a command finishes
	# if it has been running for longer than $zbell_duration seconds.
	# If there are programs that you know run long that you don't
	# want to bell after, then add them to $zbell_ignore.
	#
	# This script uses only zsh builtins so its fast, there's no needless
	# forking, and its only dependency is zsh and its standard modules
	#

	#!/usr/bin/env python3

	import shutil;
	import collections;
	import math;
	import sys;
	import argparse;

	Point = collections.namedtuple('Point', ['x', 'y', 'n'])
	HilbertAt = collections.namedtuple('HilbertAt', ['x', 'y', 'n'])

	#! /usr/bin/env bash

	####################################################
	# Required Libraries
	#
	# library name \| commands used \| verified version
	# ------------------------------------------------
	# ffmpeg \| ffmpeg/ffprobe \| 3.1.4 3.2
	# gpac \| mp4box \| 0.6.1
	# mp4v2 \| mp4chaps \| 2.0.0

	// tested using nix 0.15.0

	extern crate nix;

	use std::path::Path;
	use nix::pty::{posix_openpt, grantpt, unlockpt, ptsname};
	use nix::fcntl::{OFlag, open};
	use nix::sys::{stat, wait};
	use nix::unistd::{fork, ForkResult, setsid, dup2};
	use nix::libc::{STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO};

	#! /usr/bin/env python3

	# mbox_split.py
	#
	# Split a mailbox into separate patch files, stripping the transfer encoding
	# and minimizing the headers along the way.
	#
	# Written by Paolo Bonzini <[email protected]>

	import argparse