Difference between revisions of "Pre-release protocol"

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(→‎Changed packets: 0x33 Map Chunk has changed a whole bunch of Anvil.)
Line 234: Line 234:
 
! class="col0" | Total Size:
 
! class="col0" | Total Size:
 
| class="col1 rightalign" colspan="4" | 21 bytes + Metadata (at least 1)
 
| class="col1 rightalign" colspan="4" | 21 bytes + Metadata (at least 1)
 +
|}
 +
 +
=== [[Protocol#Map_Chunk_.280x33.29|Map Chunk (0x33)]] ===
 +
 +
This is currently a ''best guess''
 +
 +
{| class="wikitable"
 +
|- class="row0"
 +
! class="col0" | Packet ID
 +
! class="col1" | Field Name
 +
! class="col2" | Field Type
 +
! class="col3" | Example
 +
! class="col4" | Notes
 +
|- class="row1"
 +
| class="col0 centeralign" rowspan="8" | 0x33
 +
| class="col1 centeralign" | X
 +
| class="col2 centeralign" | int
 +
| class="col3 centeralign" |
 +
| class="col4" | Block X Coordinate
 +
|- class="row2"
 +
| class="col0 centeralign" | Z
 +
| class="col1 centeralign" | int
 +
| class="col2 centeralign" |
 +
| class="col3" | Block Z Coordinate
 +
|- class="row3"
 +
| class="col0 centeralign" | Unknown
 +
| class="col1 centeralign" | boolean
 +
| class="col2 centeralign" |
 +
| class="col3" |
 +
|- class="row4"
 +
| class="col0 centeralign" | Size_X
 +
| class="col1 centeralign" | short
 +
| class="col2 centeralign" |
 +
| class="col3" |
 +
|- class="row5"
 +
| class="col0 centeralign" | Size_Z
 +
| class="col1 centeralign" | short
 +
| class="col2 centeralign" |
 +
| class="col3" |
 +
|- class="row6"
 +
| class="col0 centeralign" | Compressed size
 +
| class="col1 centeralign" | int
 +
| class="col2 centeralign" |
 +
| class="col3" | Size of compressed region data
 +
|- class="row7"
 +
| class="col0 centeralign" | Unknown
 +
| class="col1 centeralign" | int
 +
| class="col2 centeralign" |
 +
| class="col3" | Not used?
 +
|- class="row8"
 +
| class="col0 centeralign" | Compressed data
 +
| class="col1 centeralign" | unsigned byte array
 +
| class="col2 centeralign" | <code>…</code>
 +
| class="col3" | The region data is compressed using ZLib Deflate function.
 +
|- class="row9"
 +
! class="col0" | Total Size:
 +
| class="col1 rightalign" colspan="4" | 22 bytes + Compressed chunk size
 
|}
 
|}
  

Revision as of 12:58, 15 February 2012

This page documents the changes from the last stable Minecraft release (currently 1.1) to the current pre-release

New packets

Entity Head Look (0x23)

Changes the direction an entity's head is facing.

Packet ID Field Name Field Type Example Notes
0x23 Entity ID int
Head Yaw byte Head yaw in steps of 2π/256
Total Size: 6 bytes

Update Tile Entity (0x84)

Essentially a block update on a tile entity.

Packet ID Field Name Field Type Example Notes
0x84 X int
Y short
Z int
Action byte The type of update to perform
Custom 1 int Varies
Custom 2 int Varies
Custom 3 int Varies
Total Size: 24 bytes

Actions

  • 1: Set mob displayed inside a mob spawner. Custom 1 contains the mob type

Changed packets

Login Request (0x01)

World height was changed to an integer.

Packet ID Field Name Field Type Example Notes
0x01 Entity ID int 1298 The Players Entity ID
Not used string (empty string) Not used
Map Seed long 971768181197178410 The server's map seed. Must be sent in respawn packets by the client.
Level Type string DEFAULT DEFAULT or SUPERFLAT; level-type in server.properties
Server mode int 0 0 for survival, 1 for creative
Dimension byte 0 -1: The Nether, 0: The Overworld, 1: The End
Difficulty byte 1 0 thru 3 for Peaceful, Easy, Normal, Hard
World height int 256 Defaults to 256
Max players unsigned byte 8 Used by the client to draw the player list
Total Size: 28 bytes + length of strings

TODO: Figure out other packets

Handshake (0x02)

Client to Server

The hostname and port were added to this packet, most likely to allow virtual hosting .(sample implementation)

Packet ID Field Name Field Type Example Notes
0x02 UsernameAndHost string TkTech;localhost:25565 The username of the player attempting to connect, and the host he is connecting to, seperated by a semicolon.
Total Size: 3 bytes + length of strings

Mob Spawn (0x18)

New byte field: head yaw

This needs confirmation!

Packet ID Field Name Field Type Example Notes
0x18 EID int 446 Entity ID
Type byte 91 The type of mob. See Entities#Mobs
X int 13366 The Absolute Integer X Position of the object
Y int 2176 The Absolute Integer Y Position of the object
Z int 1680 The Absolute Integer Z Position of the object
Yaw byte -27 The yaw in steps of 2π/256
Pitch byte 0 The pitch in steps of 2π/256
Head Yaw byte Head yaw in steps of 2π/256
Metadata Metadata 127 Varies by mob, see Entities
Total Size: 21 bytes + Metadata (at least 1)

Map Chunk (0x33)

This is currently a best guess

Packet ID Field Name Field Type Example Notes
0x33 X int Block X Coordinate
Z int Block Z Coordinate
Unknown boolean
Size_X short
Size_Z short
Compressed size int Size of compressed region data
Unknown int Not used?
Compressed data unsigned byte array … The region data is compressed using ZLib Deflate function.
Total Size: 22 bytes + Compressed chunk size

Other changes

Protocol version is now 27.

Protocol History

2012-02-15

  • 12w07a
  • Protocol version is now 27
  • Updated packets: 0x01, 0x09, 0x33

2012-02-09

  • 12w06a
  • Protocol version is now 25
  • New packet: 0x84

2012-01-26

  • 12w04a
  • Protocol version has not been changed
  • Handshake Packet by client (0x02) now contains the server host and port
  • Window Open Packet (0x64): WindowTitle is now longer than accepted by older clients. Contains a keyword such as "container.furnace"

2012-01-19

  • 12w03a
  • Protocol version is now 24
  • New packet: 0x23
  • MobSpawn: new field, 1 byte inserted before metadata.
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