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util/uuid.lua @ 13262:9a86e7cbdd79
mod_storage_internal: Fix fast trimming of archive with exactly one item
This method would previously never delete the first (and only) item
since it works out which item should become the first item after the
trim operation, which doesn't make sense when all should be removed.
This also works as an optimization for when all the last item should be
trimmed, thus items should be removed.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Sun, 24 Sep 2023 13:41:54 +0200 |
parent | 12975:d10957394a3c |
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-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local random = require "prosody.util.random"; local random_bytes = random.bytes; local hex = require "prosody.util.hex".encode; local m_ceil = math.ceil; local function get_nibbles(n) return hex(random_bytes(m_ceil(n/2))):sub(1, n); end local function get_twobits() return ("%x"):format(random_bytes(1):byte() % 4 + 8); end local function generate() -- generate RFC 4122 complaint UUIDs (version 4 - random) return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12); end return { get_nibbles=get_nibbles; generate = generate ; -- COMPAT seed = random.seed; };