Pre-release protocol: Difference between revisions

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imported>Barneygale
→‎Changed packets: Update progress bar (0x69) gives enchantment table data.
imported>Barneygale
Update for weekly releases: New packet 0xFA, 0x01 login and 0x09 respawn changed
Line 1: Line 1:
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.8.1) to the current pre-release (currently 1.0RC2)
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.0.1) to the current pre-release (currently 12w01a)


== New packets ==
== New packets ==


=== Enchant Item (0x6C) ===
=== Unknown (0xFA) ===
 
'''Client to Server only'''


{| class="wikitable"
{| class="wikitable"
Line 15: Line 13:
! class="col4" | Notes
! class="col4" | Notes
|- class="row1"
|- class="row1"
| class="col0 centeralign" rowspan=2 | 0x6C
| class="col0 centeralign" rowspan=3 | 0xFA
| class="col1 centeralign" | Window ID
| class="col1 centeralign" | Unknown
| class="col2 centeralign" | byte
| class="col2 centeralign" | string
| class="col3 centeralign" | 1
| class="col3 centeralign" |  
| class="col4" | The ID sent by [[Protocol#Open_window_.280x64.29|0x64]]
| class="col4" |
|- class="row2"
|- class="row2"
| class="col1 centeralign" | Enchantment
| class="col1 centeralign" | Length of array
| class="col2 centeralign" | byte
| class="col2 centeralign" | short
| class="col3 centeralign" | 0
| class="col3 centeralign" |
| class="col4" | The position of the enchantment on the enchantment table window, starting with 0 as the topmost one.
| class="col4" | Length of the following array
|- class="row3"
|- class="row3"
| class="col1 centeralign" | Array
| class="col2 centeralign" | byte[]
| class="col3 centeralign" |
| class="col4" |
|- class="row4"
! class="col0" | Total Size:
! class="col0" | Total Size:
| class="col1 rightalign" colspan="4" | 3 bytes
| class="col1 rightalign" colspan="4" | 5 bytes + string + array
|}
|}


== Changed packets ==
== Changed packets ==


=== "Slot" type change ===
=== [[Protocol#Login_Request_.280x01.29|Login Request (0x01)]] ===


Four packets changed:
New string field added


* [[Protocol#Player_Block_Placement_.280x0F.29|0x0F player block placement]]
==== Client to Server ====
* [[Protocol#Window_click_.280x66.29|0x66 window click]]
* [[Protocol#Set_slot_.280x67.29|0x67 set slot]]
* [[Protocol#Window_items_.280x68.29|0x68 window items]]
* 0x6B Create Inventory


This change affects the "slot" datatype. This type consists of at least a short (item_id). If this id isn't <code>-1</code>, a byte (count) and a short (uses) follow.
{| class="wikitable"
 
|- class="row0"
From 1.9pre2 onward, additional data is sent but only for [https://gist.github.com/1268479 certain item_ids]. This means the protocol is no longer context free. The additional data is ''at least'' a short. If this short isn't -1, a byte[] array follows, containing ''gzipped'' NBT data
! class="col0" | Packet ID
 
! class="col1" | Field Name
As of 1.9pre3, the format of the NBT is as follows
! class="col2" | Field Type
! class="col3" | Example
! class="col4" | Notes
|- class="row1"
| class="col0 centeralign" rowspan="9" | 0x01
| class="col1 centeralign" | Protocol Version
| class="col2 centeralign" | int
| class="col3 centeralign" | <code>20</code>
| class="col4" | 1.0.0's protocol version is <code>22</code>
|- class="row2"
| class="col0 centeralign" | Username
| class="col1 centeralign" | string
| class="col2 centeralign" | <code>TkTech</code>
| class="col3" | The name of the user attempting to login, max length of 16
|- class="row3"
| class="col0 centeralign" | Not used
| class="col1 centeralign" | long
| class="col2 centeralign" | <code>0</code>
| class="col3" |
|- class="row4"
| class="col0 centeralign" | '''Unknown'''
| class="col1 centeralign" | string
| class="col2 centeralign" |
| class="col3" |
|- class="row5"
| class="col0 centeralign" | Not used
| class="col1 centeralign" | int
| class="col2 centeralign" | <code>0</code>
| class="col3" |
|- class="row6"
| class="col0 centeralign" | Not used
| class="col1 centeralign" | byte
| class="col2 centeralign" | <code>0</code>
| class="col3" |
|- class="row7"
| class="col0 centeralign" | Not used
| class="col1 centeralign" | byte
| class="col2 centeralign" | <code>0</code>
| class="col3" |
|- class="row8"
| class="col0 centeralign" | Not used
| class="col1 centeralign" | unsigned byte
| class="col2 centeralign" | <code>0</code>
| class="col3" |
|- class="row9"
| class="col0 centeralign" | Not used
| class="col1 centeralign" | unsigned byte
| class="col2 centeralign" | <code>0</code>
| class="col3" |
|- class="row10"
! class="col0" | Total Size:
| class="col1 rightalign" colspan="4" | 25 bytes + length of strings
|}


<code>
==== Server to Client ====
  COMPOUND
    LIST: 'ench'
      SHORT: 'id'
      SHORT: 'lvl'
    END
  END
</code>
 
=== [[Protocol#Experience_.280x2B.29|Experience (0x2B)]] ===


{| class="wikitable"
{| class="wikitable"
Line 67: Line 109:
! class="col4" | Notes
! class="col4" | Notes
|- class="row1"
|- class="row1"
| class="col0 centeralign" rowspan="3" | 0x2B
| class="col0 centeralign" rowspan="9" | 0x01
| class="col1 centeralign" | Experience bar
| class="col1 centeralign" | Entity ID
| class="col2 centeralign" | float
| class="col2 centeralign" | int
| class="col3 centeralign" | <code>0.5960060358047485</code>
| class="col3 centeralign" | <code>1298</code>
| class="col4" | Used for drawing the experience bar - value is between 0 and 1.
| class="col4" | The Players Entity ID
|- class="row2"
|- class="row2"
| class="col0 centeralign" | Level
| class="col0 centeralign" | Not used
| class="col1 centeralign" | short
| class="col1 centeralign" | string
| class="col2 centeralign" | <code>8</code>
| class="col2 centeralign" | (empty string)
| class="col4" |
| class="col3" | Not used
|- class="row3"
|- class="row3"
| class="col0 centeralign" | Total experience
| class="col0 centeralign" | Map Seed
| class="col1 centeralign" | short
| class="col1 centeralign" | long
| class="col2 centeralign" | <code>130</code>
| class="col2 centeralign" | <code>971768181197178410</code>
| class="col3" |
| class="col3" | The server's map seed. Must be sent in respawn packets by the client.
|- class="row4"
|- class="row4"
| class="col0 centeralign" | '''Unknown'''
| class="col1 centeralign" | string
| class="col2 centeralign" |
| class="col3" |
|- class="row5"
| class="col0 centeralign" | Server mode
| class="col1 centeralign" | int
| class="col2 centeralign" | <code>0</code>
| class="col3" | 0 for survival, 1 for creative
|- class="row6"
| class="col0 centeralign" | Dimension
| class="col1 centeralign" | byte
| class="col2 centeralign" | <code>0</code>
| class="col3" | <code>-1</code>: The Nether, <code>0</code>: The Overworld, <code>1</code>: The End
|- class="row7"
| class="col0 centeralign" | Difficulty
| class="col1 centeralign" | byte
| class="col2 centeralign" | <code>1</code>
| class="col3" | <code>0</code> thru <code>3</code> for Peaceful, Easy, Normal, Hard
|- class="row8"
| class="col0 centeralign" | World height
| class="col1 centeralign" | unsigned byte
| class="col2 centeralign" | <code>128</code>
| class="col3" | Defaults to <code>128</code>
|- class="row9"
| class="col0 centeralign" | Max players
| class="col1 centeralign" | unsigned byte
| class="col2 centeralign" | <code>8</code>
| class="col3" | Used by the client to draw the player list
|- class="row10"
! class="col0" | Total Size:
! class="col0" | Total Size:
| class="col1 rightalign" colspan="4" | 9 bytes
| class="col1 rightalign" colspan="4" | 25 bytes + length of strings
|}
|}


=== [[Protocol#Update_progress_bar_.280x69.29|Update progress bar (0x69)]] ===
=== [[Protocol#Respawn_.280x09.29|Respawn (0x09) ]] ===


Now used to list available enchantments in the enchantment table. The "progress bar" field is the index - 0, 1 or 2. The "value" field gives the enchantment's level.
New string field added


This field should probably be renamed to "Window property change" or something.
{| 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="6" | 0x09
| class="col1 centeralign" | Dimension
| class="col2 centeralign" | byte
| class="col3 centeralign" | <code>1</code>
| class="col4" | <code>-1</code>: The Nether, <code>0</code>: The Overworld, <code>1</code>: The End
|- class="row2"
| class="col1 centeralign" | Difficulty
| class="col2 centeralign" | byte
| class="col3 centeralign" | <code>1</code>
| class="col4" | <code>0</code> thru <code>3</code> for Peaceful, Easy, Normal, Hard. <code>1</code> is always sent c->s
|- class="row2"
| class="col1 centeralign" | Creative mode
| class="col2 centeralign" | byte
| class="col3 centeralign" | <code>1</code>
| class="col4" | <code>0</code> for survival, <code>1</code> for creative.
|- class="row1"
| class="col1 centeralign" | World height
| class="col2 centeralign" | short
| class="col3 centeralign" | <code>128</code>
| class="col4" | Defaults to <code>128</code>
|- class="row1"
| class="col1 centeralign" | Map Seed
| class="col2 centeralign" | long
| class="col3 centeralign" | <code>-3815848935435401459</code>
|- class="row1"
| class="col1 centeralign" | '''Unknown'''
| class="col2 centeralign" | string
| class="col3 centeralign" |
| class="col4" |
|- class="row2"
! class="col0" | Total Size:
| class="col1 rightalign" colspan="4" | 16 bytes + length of string
|}


== Other changes ==
== Other changes ==


Protocol version is 20, as of 1.9pre4
None currently.
 
[[Protocol#Mob_Types|New mobs]]: Blaze, Magma Cube, Ender Dragon, Snowman, Villager
 
Notchian server features two new protocols: [[Rcon|RCON]] (server class: o.java) and [[Query|Query]] (server class: su.java)


== Protocol History ==
== Protocol History ==


=== 2011-11-13 ===
=== 2012-01-05 ===
* 1.0rc2
* 12w01a
* Protocol version is not changed
* Protocol version is now 23
* Client gives invalid server key when authentication hash is 8 bytes and the first byte is > 0x80
* Bow has extra metadata as slot item.
 
=== 2011-11-11 ===
* Beta 1.9 pre6.
* Protocol version is now 22
* NewState: Reason 4 = Enter scrolling text mode after slaying the dragon.
* New entity: EnderCrystal (Spawned using the [[Protocol#Add_Object.2FVehicle_.280x17.29|Add Object/Vehicle (0x17)]] packet with type 51)


=== 2011-10-27 ===
=== 2011-12-15 ===
* Beta 1.9 pre5.
* 11w50a
* Protocol version is now 21
* Packet 0x6B (Create Inventory) changed: uses Slot datatype.


=== 2011-10-13 ===
=== 2011-12-08 ===
* <div class="li">Beta 1.9 pre4.</div>
* 11w49a
* Protocol version is now 20
* Packet 0x2B ([[#Experience_.280x2B.29|Experience]]) changed: now (float, short, short)
* New packet 0x6C ([[#Enchant_Item_.280x6C.29|Enchant item]]) added: (byte, byte)
* Flint and steel no longer enchantable (see 1.9pre3 changes). Might be others, too.
* Notchian server now features an [[Rcon|RCON]] server (server class: o.java)
* Notchian server now features "G4S" server [http://pear.php.net/package/Net_GameServerQuery]


=== 2011-9-29 ===
=== 2011-12-01 ===
* <div class="li">Beta 1.9 pre2.</div>
* 11w48a
* Protocol version is now 19
* Four packets changed:
** [[Protocol#Player_Block_Placement_.280x0F.29|0x0F player block placement]]
** [[Protocol#Window_click_.280x66.29|0x66 window click]]
** [[Protocol#Set_slot_.280x67.29|0x67 set slot]]
** [[Protocol#Window_items_.280x68.29|0x68 window items]]
* The change affects the "slot" datatype. This type consists of at least a short (item_id). If this id isn't <code>-1</code>, a byte (count) and a short (uses) follow.
* From 1.9pre2 onward, additional data is sent but only for [https://gist.github.com/1268479 certain item_ids]. This means the protocol is no longer context free. The additional data is ''at least'' a short. If this short isn't -1, a byte[] array follows, containing ''gzipped'' NBT data
* The format of the NBT is as follows
<code>
  COMPOUND
    LIST: 'ench'
      SHORT: 'id'
      SHORT: 'lvl'
    END
  END
</code>
* So far only this format, with 'id' and 'lvl' set to <code>2</code> and <code>1</code> respectively, has been seen.


=== 2011-9-22 ===
=== 2011-11-24 ===
* <div class="li">Beta 1.9 pre1.</div>
* 11w47a
* Protocol version is now 18

Revision as of 08:59, 6 January 2012

This page documents the changes from the last stable Minecraft release (currently 1.0.1) to the current pre-release (currently 12w01a)

New packets

Unknown (0xFA)

Packet ID Field Name Field Type Example Notes
0xFA Unknown string
Length of array short Length of the following array
Array byte[]
Total Size: 5 bytes + string + array

Changed packets

Login Request (0x01)

New string field added

Client to Server

Packet ID Field Name Field Type Example Notes
0x01 Protocol Version int 20 1.0.0's protocol version is 22
Username string TkTech The name of the user attempting to login, max length of 16
Not used long 0
Unknown string
Not used int 0
Not used byte 0
Not used byte 0
Not used unsigned byte 0
Not used unsigned byte 0
Total Size: 25 bytes + length of strings

Server to Client

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.
Unknown string
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 unsigned byte 128 Defaults to 128
Max players unsigned byte 8 Used by the client to draw the player list
Total Size: 25 bytes + length of strings

Respawn (0x09)

New string field added

Packet ID Field Name Field Type Example Notes
0x09 Dimension byte 1 -1: The Nether, 0: The Overworld, 1: The End
Difficulty byte 1 0 thru 3 for Peaceful, Easy, Normal, Hard. 1 is always sent c->s
Creative mode byte 1 0 for survival, 1 for creative.
World height short 128 Defaults to 128
Map Seed long -3815848935435401459
Unknown string
Total Size: 16 bytes + length of string

Other changes

None currently.

Protocol History

2012-01-05

  • 12w01a
  • Protocol version is now 23

2011-12-15

  • 11w50a

2011-12-08

  • 11w49a

2011-12-01

  • 11w48a

2011-11-24

  • 11w47a
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