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util.datamanager: Add O(1) list indexing with on-disk index
Index file contains offsets and lengths of each item() which allows
seeking directly to each item and reading it without parsing the entire
file.
Also allows tricks like binary search, assuming items have some defined
order.
We take advantage of the 1-based indexing in tables to store a magic
header in the 0 position, so that table index 1 ends up at file index 1.
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 11 May 2021 02:09:56 +0200 |
parent | 12354:3ce3633527af |
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All source code in this project is released under the below MIT license. Some components are not authored by the Prosody maintainers, but such code is itself either released under a MIT license or declared public domain. --- Copyright (C) 2008-2022 Matthew Wild Copyright (C) 2008-2020 Waqas Hussain Copyright (C) 2010-2022 Kim Alvefur Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --- util-src/encodings.c: Parts included from Lua 5.3. Copyright (C) 1994-2015 Lua.org, PUC-Rio. util-src/signal.c: Copyright (C) 2007 Patrick J. Donnelly (batrick@batbytes.com) See full copyright notice in the source file. util-src/struct.c: Copyright (C) 2010-2018 Lua.org, PUC-Rio. All rights reserved. See full copyright notice in the source file. net/dns.lua: public domain 20080404 lua@ztact.com