minetest.git - modified minetest for gpcfs purposes

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=============================
Minetest World Format 22...25
=============================

This applies to a world format carrying the block serialization version
22...25, used at least in
- 0.4.dev-20120322 ... 0.4.dev-20120606 (22...23)
- 0.4.0 (23)
- 24 was never released as stable and existed for ~2 days

The block serialization version does not fully specify every aspect of this
format; if compliance with this format is to be checked, it needs to be
done by detecting if the files and data indeed follows it.

Legacy stuff
=============
Data can, in theory, be contained in the flat file directory structure
described below in Version 17, but it is not officially supported. Also you
may stumble upon all kinds of oddities in not-so-recent formats.

Files
======
Everything is contained in a directory, the name of which is freeform, but
often serves as the name of the world.

Currently the authentication and ban data is stored on a per-world basis.
It can be copied over from an old world to a newly created world.

World
|-- auth.txt ----- Authentication data
|-- env_meta.txt - Environment metadata
|-- ipban.txt ---- Banned ips/users
|-- map_meta.txt - Map metadata
|-- map.sqlite --- Map data
|-- players ------ Player directory
|   |-- player1 -- Player file
|   '-- Foo ------ Player file
`-- world.mt ----- World metadata

auth.txt
---------
Contains authentication data, player per line.
  <name>:<password hash>:<privilege1,...>

Legacy format (until 0.4.12) of password hash is <name><password> SHA1'd,
in the base64 encoding.

Format (since 0.4.13) of password hash is #1#<salt>#<verifier>, with the
parts inside <> encoded in the base64 encoding.
<verifier> is an RFC 2945 compatible SRP verifier,
of the given salt, password, and the player's name lowercased,
using the 2048-bit group specified in RFC 5054 and the SHA-256 hash function.

Example lines:
- Player "celeron55", no password, privileges "interact" and "shout":
    celeron55::interact,shout
- Player "Foo", password "bar", privilege "shout", with a legacy password hash:
    foo:iEPX+SQWIR3p67lj/0zigSWTKHg:shout
- Player "Foo", password "bar", privilege "shout", with a 0.4.13 pw hash:
    foo:#1#hPpy4O3IAn1hsNK00A6wNw#Kpu6rj7McsrPCt4euTb5RA5ltF7wdcWGoYMcRngwDi11cZhPuuR9i5Bo7o6A877TgcEwoc//HNrj9EjR/CGjdyTFmNhiermZOADvd8eu32FYK1kf7RMC0rXWxCenYuOQCG4WF9mMGiyTPxC63VAjAMuc1nCZzmy6D9zt0SIKxOmteI75pAEAIee2hx4OkSXRIiU4Zrxo1Xf7QFxkMY4x77vgaPcvfmuzom0y/fU1EdSnZeopGPvzMpFx80ODFx1P34R52nmVl0W8h4GNo0k8ZiWtRCdrJxs8xIg7z5P1h3Th/BJ0lwexpdK8sQZWng8xaO5ElthNuhO8UQx1l6FgEA:shout
- Player "bar", no password, no privileges:
    bar::

env_meta.txt
-------------
Simple global environment variables.
Example content (added indentation):
  game_time = 73471
  time_of_day = 19118
  EnvArgsEnd

ipban.txt
----------
Banned IP addresses and usernames.
Example content (added indentation):
  123.456.78.9|foo
  123.456.78.10|bar

map_meta.txt
-------------
Simple global map variables.
Example content (added indentation):
  seed = 7980462765762429666
  [end_of_params]

map.sqlite
-----------
Map data.
See Map File Format below.

player1, Foo
-------------
Player data.
Filename can be anything.
See Player File Format below.

world.mt
---------
World metadata.
Example content (added indentation):
  gameid = mesetint

Player File Format
===================

- Should be pretty self-explanatory.
- Note: position is in nodes * 10

Example content (added indentation):
  hp = 11
  name = celeron55
  pitch = 39.77
  position = (-5231.97,15,1961.41)
  version = 1
  yaw = 101.37
  PlayerArgsEnd
  List main 32
  Item default:torch 13
  Item default:pick_steel 1 50112
  Item experimental:tnt
  Item default:cobble 99
  Item default:pick_stone 1 13104
  Item default:shovel_steel 1 51838
  Item default:dirt 61
  Item default:rail 78
  Item default:coal_lump 3
  Item default:cobble 99
  Item default:leaves 22
  Item default:gravel 52
  Item default:axe_steel 1 2045
  Item default:cobble 98
  Item default:sand 61
  Item default:water_source 94
  Item default:glass 2
  Item default:mossycobble
  Item default:pick_steel 1 64428
  Item animalmaterials:bone
  Item default:sword_steel
  Item default:sapling
  Item default:sword_stone 1 10647
  Item default:dirt 99
  Empty
  Empty
  Empty
  Empty
  Empty
  Empty
  Empty
  Empty
  EndInventoryList
  List craft 9
  Empty
  Empty
  Empty
  Empty
  Empty
  Empty
  Empty
  Empty
  Empty
  EndInventoryList
  List craftpreview 1
  Empty
  EndInventoryList
  List craftresult 1
  Empty
  EndInventoryList
  EndInventory

Map File Format
================

Minetest maps consist of MapBlocks, chunks of 16x16x16 nodes.

In addition to the bulk node data, MapBlocks stored on disk also contain
other things.

History
--------
We need a bit of history in here. Initially Minetest stored maps in a
format called the "sectors" format. It was a directory/file structure like
this:
  sectors2/XXX/ZZZ/YYYY
For example, the MapBlock at (0,1,-2) was this file:
  sectors2/000/ffd/0001

Eventually Minetest outgrow this directory structure, as filesystems were
struggling under the amount of files and directories.

Large servers seriously needed a new format, and thus the base of the
current format was invented, suggested by celeron55 and implemented by
JacobF.

SQLite3 was slammed in, and blocks files were directly inserted as blobs
in a single table, indexed by integer primary keys, oddly mangled from
coordinates.

Today we know that SQLite3 allows multiple primary keys (which would allow
storing coordinates separately), but the format has been kept unchanged for
that part. So, this is where it has come.
</history>

So here goes
-------------
map.sqlite is an sqlite3 database, containing a single table, called
"blocks". It looks like this:

  CREATE TABLE `blocks` (`pos` INT NOT NULL PRIMARY KEY,`data` BLOB);

The key
--------
"pos" is created from the three coordinates of a MapBlock using this
algorithm, defined here in Python:

  def getBlockAsInteger(p):
      return int64(p[2]*16777216 + p[1]*4096 + p[0])

  def int64(u):
      while u >= 2**63:
          u -= 2**64
      while u <= -2**63:
          u += 2**64
      return u

It can be converted the other way by using this code:

  def getIntegerAsBlock(i):
      x = unsignedToSigned(i % 4096, 2048)
      i = int((i - x) / 4096)
      y = unsignedToSigned(i % 4096, 2048)
      i = int((i - y) / 4096)
      z = unsignedToSigned(i % 4096, 2048)
      return x,y,z

  def unsignedToSigned(i, max_positive):
      if i < max_positive:
          return i
      else:
          return i - 2*max_positive

The blob
---------
The blob is the data that would have otherwise gone into the file.

See below for description.

MapBlock serialization format
==============================
NOTE: Byte order is MSB first (big-endian).
NOTE: Zlib data is in such a format that Python's zlib at least can
      directly decompress.

u8 version
- map format version number, see serialisation.h for the latest number

u8 flags


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