Pre-release protocol

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Revision as of 18:58, 10 October 2013 by Thinkofdeath (talk | contribs) (→‎Play)
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This page documents the changes from the last stable Minecraft release (currently 1.6.2, protocol 74) to the current pre-release. Note that this page contains bleeding-edge information that may not be completely or correctly documented. He who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occured to the respective packets there.

Protocol History

13w36a - Added sound category byte to 0x3E - Changed 0xC8 to a string:int map

13w37b -

1.6.3 - Terrain fixes to help moving to 1.7, no packet changes from 1.6.2

1.6.4 -

13w38a/b/c -

13w39a/b - UUIDs added to spawn named entity, game state 'gamemode' byte -> float

13w41a - Large protocol work

Protocol Version

13w41a -

13w39a/b - 80

13w38a/b/c - 79

1.6.4 - 78

1.6.3 - 77

13w37b - 76

13w36a - 75

Packet format

Field Name Field Type Notes
Length VarInt
Type VarInt
Data

Data Types

VarInt - Protocol Buffer 32-bit Varint

String - UTF-8 String

Handshaking

Serverbound

?

Packet ID Field Name Field Type Notes
0x00 VarInt
String
VarInt
VarInt

Play

Clientbound

Keep Alive

Packet ID Field Name Field Type Notes
0x00 Keep Alive ID Int


Join Game

Packet ID Field Name Field Type Notes
0x01 Entity ID Int The player's Entity ID
Level type String level-type in server.properties
Gamemode Byte 0: survival, 1: creative, 2: adventure. Bit 3 (0x8) is the hardcore flag
Dimension Byte -1: nether, 0: overworld, 1: end
Difficulty Unsigned Byte 0 thru 3 for Peaceful, Easy, Normal, Hard
Byte
Max Players Byte Used by the client to draw the player list

Chat Message

Packet ID Field Name Field Type Notes
0x02 JSON Data String https://gist.github.com/thinkofdeath/e882ce057ed83bac0a1c

Time Update

Packet ID Field Name Field Type Notes
0x03 Age of the world Long In ticks; not changed by server commands
Time of day Long The world (or region) time, in ticks. If negative the sun will stop moving at the Math.abs of the time

Entity Equipment

Packet ID Field Name Field Type Notes
0x04 EntityID Int Entity's ID
Slot Short Equipment slot: 0=held, 1-4=armor slot (1 - boots, 2 - leggings, 3 - chestplate, 4 - helmet)
Item Slot Item in slot format

Spawn Position

Packet ID Field Name Field Type Notes
0x05 X Int Spawn X in block coordinates
Y Int Spawn Y in block coordinates
Z Int in block coordinates

Update Health

Packet ID Field Name Field Type Notes
0x06 Health Float 0 or less = dead, 20 = full HP
Food Short 0 - 20
Food Saturation Float Seems to vary from 0.0 to 5.0 in integer increments

Respawn

Packet ID Field Name Field Type Notes
0x07 Dimension Int -1: The Nether, 0: The Overworld, 1: The End
Difficulty Byte 0 thru 3 for Peaceful, Easy, Normal, Hard.
Gamemode Byte 0: survival, 1: creative, 2: adventure. The hardcore flag is not included
World Height Short Defaults to 256
Level Type String

Player

Packet ID Field Name Field Type Notes
0x08 On Ground True if the client is on the ground, False otherwise

Player Position

Packet ID Field Name Field Type Notes
0x09 X Double Absolute position
Y Double Absolute position
Stance Double Used to modify the players bounding box when going up stairs, crouching, etc…
Z Double Absolute position
On Ground Bool True if the client is on the ground, False otherwise

Player Look

Packet ID Field Name Field Type Notes
0x0A Yaw Float Absolute rotation on the X Axis, in degrees
Pitch Float Absolute rotation on the Y Axis, in degrees
On Ground Bool True if the client is on the ground, False otherwise

Player Position And Look

Packet ID Field Name Field Type Notes
0x0B X Double Absolute position
Y Double Absolute position
Stance Double Used to modify the players bounding box when going up stairs, crouching, etc…
Z Double Absolute position
Yaw Float Absolute rotation on the X Axis, in degrees
Pitch Float Absolute rotation on the Y Axis, in degrees
On Ground Bool True if the client is on the ground, False otherwise

Held Item Change

Packet ID Field Name Field Type Notes
0x0C Slot Short The slot which the player has selected (0-8)

Use Bed

Packet ID Field Name Field Type Notes
0x0D Entity ID Int Player ID
Byte
X Int Bed headboard X as block coordinate
Y Unsigned Byte Bed headboard Y as block coordinate
Z Int Bed headboard Z as block coordinate

Animation

Packet ID Field Name Field Type Notes
0x0E Entity ID Int Player ID
Animation Byte Animation ID

Animation can be one of the following values:

ID Animation
0 No animation
1 Swing arm
2 Damage animation
3 Leave bed
5 Eat food
6 Critical effect
7 Magic critical effect
102 (unknown)
104 Crouch
105 Uncrouch

Spawn Player

Packet ID Field Name Field Type Notes
0x0F Entity ID Int Player's Entity ID
Player UUID String Player's UUID
Player Name String Player's Name
X Int Player X as a Fixed-Point number
Y Int Player X as a Fixed-Point number
Z Int Player X as a Fixed-Point number
Yaw Byte Player rotation as a packed byte
Pitch Byte Player rotation as a packet byte
Current Item Short The item the player is currently holding. Note that this should be 0 for "no item", unlike -1 used in other packets. A negative value crashes clients.
Metadata Metadata The client will crash if no metadata is sent

Collect Item

Packet ID Field Name Field Type Notes
0x10 Collected Entity ID Int
Collector Entity ID Int

Spawn Object

Packet ID Field Name Field Type Notes
0x11 Entity ID Int Entity ID of the object
Type Byte The of object (See Objects
X Int X position as a Fixed-Point number
Y Int Y position as a Fixed-Point number
Z Int Z position as a Fixed-Point number
Pitch Byte The pitch in steps of 2p/256
Yaw Byte The yaw in steps of 2p/256
Data Object Data

Spawn Mob

Packet ID Field Name Field Type Notes
0x12 Entity ID Int Entity's ID
Type Unsigned Byte The type of mob. See Mobs
X Int X position as a Fixed-Point number
Y Int Y position as a Fixed-Point number
Z Int Z position as a Fixed-Point number
Pitch Byte The pitch in steps of 2p/256
Head Pitch Byte The pitch in steps of 2p/256
Yaw Byte The yaw in steps of 2p/256
Velocity X Short
Velocity Y Short
Velocity Z Short
Metadata Metadata

Spawn Painting

Packet ID Field Name Field Type Notes
0x13 Entity ID Int Entity's ID
Title String Name of the painting. Max length 13
X Int Center X coordinate
Y Int Center Y coordinate
Z Int Center Z coordinate
Direction Int Direction the painting faces (0 -z, 1 -x, 2 +z, 3 +x)

Spawn Experience Orb

Packet ID Field Name Field Type Notes
0x14 Entity ID Int Entity's ID
X Int X position as a Fixed-Point number
Y Int Y position as a Fixed-Point number
Z Int Z position as a Fixed-Point number
Count Short The amount of experience this orb will reward once collected

Entity Velocity

Packet ID Field Name Field Type Notes
0x15 Entity ID Int Entity's ID
Velocity X Short Velocity on the X axis
Velocity Y Short Velocity on the Y axis
Velocity Z Short Velocity on the Z axis

Destroy Entitie s

Packet ID Field Name Field Type Notes
0x16 Count Byte Length of following array
Entity IDs Array of Int The list of entities of destroy

Entity

Packet ID Field Name Field Type Notes
0x17 Entity ID Int Entity's ID

Entity Relative Move

Packet ID Field Name Field Type Notes
0x18 Entity ID Int Entity's ID
DX Byte Change in X position as a Fixed-Point number
DY Byte Change in Y position as a Fixed-Point number
DZ Byte Change in Z position as a Fixed-Point number

Entity Look

Packet ID Field Name Field Type Notes
0x19 Entity ID Int Entity's ID
Yaw Byte The X Axis rotation as a fraction of 360
Pitch Byte The Y Axis rotation as a fraction of 360

Entity Look and Relative Move

Packet ID Field Name Field Type Notes
0x1A Entity ID Int Entity's ID
DX Byte Change in X position as a Fixed-Point number
DY Byte Change in Y position as a Fixed-Point number
DZ Byte Change in Z position as a Fixed-Point number
Yaw Byte The X Axis rotation as a fraction of 360
Pitch Byte The Y Axis rotation as a fraction of 360

Entity Teleport

Packet ID Field Name Field Type Notes
0x1B Entity ID Int Entity's ID
X Byte X position as a Fixed-Point number
Y Byte Y position as a Fixed-Point number
Z Byte Z position as a Fixed-Point number
Yaw Byte The X Axis rotation as a fraction of 360
Pitch Byte The Y Axis rotation as a fraction of 360

Entity Head Look

Packet ID Field Name Field Type Notes
0x1C Entity ID Int Entity's ID
Head Yaw Byte Head yaw in steps of 2p/256

Entity Status

Packet ID Field Name Field Type Notes
0x1D Entity ID Int Entity's ID
Entity Status Byte See below
Entity Status Meaning
2 Entity hurt
3 Entity dead
6 Wolf taming
7 Wolf tamed
8 Wolf shaking water off itself
9 (of self) Eating accepted by server
10 Sheep eating grass
11 Iron Golem handing over a rose
12 Spawn "heart" particles near a villager
13 Spawn particles indicating that a villager is angry and seeking revenge
14 Spawn happy particles near a villager
15 Spawn a "magic" particle near the Witch
16 Zombie converting into a villager by shaking violently (unused in recent update)
17 A firework exploding

Attach Entity

Packet ID Field Name Field Type Notes
0x1E Entity ID Int Entity's ID
Vehicle ID Int Vechicle's Entity ID
Leash Bool If true leashes the entity to the vehicle

Attach Entity

Packet ID Field Name Field Type Notes
0x1F Entity ID Int Entity's ID
Metadata Metadata

Entity Effect

Packet ID Field Name Field Type Notes
0x20 Entity ID Int Entity's ID
Effect ID Byte See [[1]]
Amplifier Byte
Duration Short

Remove Entity Effect

Packet ID Field Name Field Type Notes
0x21 Entity ID Int Entity's ID
Effect ID Byte

Set Experience

Packet ID Field Name Field Type Notes
0x22 Experience bar Float Between 0 and 1
Level Short
Total Experience Short

Entity Properties

Packet ID Field Name Field Type Notes
0x23 Entity ID Entity's ID
Count Int Length of following array
Properties Array of Property Data

Property Data structure:

Field Name Field Type Notes
Key String
Value Double
List Length Short Number of list elements that follow.
Modifiers Array of Modifier Data http://www.minecraftwiki.net/wiki/Attribute#Modifiers

Known key values:

Key Default Min Max Label
generic.maxHealth 20.0 0.0 Double.MaxValue Max Health
generic.followRange 32.0 0.0 2048.0 Follow Range
generic.knockbackResistance 0.0 0.0 1.0 Knockback Resistance
generic.movementSpeed 0.699999988079071 0.0 Double.MaxValue Movement Speed
generic.attackDamage 2.0 0.0 Double.MaxValue
horse.jumpStrength 0.7 0.0 2.0 Jump Strength
zombie.spawnReinforcements 0.0 0.0 1.0 Spawn Reinforcements Chance

Modifier Data structure:

Field Name Field Type Notes
UUID 128-bit integer
Amount Double
Operation Byte

Chunk Data

Packet ID Field Name Field Type Notes
0x24 Chunk X Int Chunk X coordinate
Chunk Z Int Chunk Z coordinate
Ground-Up continuous Boolean This is True if the packet represents all sections in this vertical column, where the primary bit map specifies exactly which sections are included, and which are air
Primary bit map Unsigned Short Bitmask with 1 for every 16x16x16 section which data follows in the compressed data.
Add bit map Unsigned Short Same as above, but this is used exclusively for the 'add' portion of the payload
Compressed size Int Size of compressed chunk data
Compressed data Byte array The chunk data is compressed using Zlib Deflate

Multi Block Change

Packet ID Field Name Field Type Notes
0x25 Chunk X Int Chunk X coordinate
Chunk Z Int Chunk Z Coordinate
Record count Short The number of blocks affected
Data size Int The total size of the data, in bytes. Should always be 4*record count
Records Array of Records

Record

Bit mask Width Meaning
00 00 00 0F 4 bits Block metadata
00 00 FF F0 12 bits Block ID
00 FF 00 00 8 bits Y co-ordinate
0F 00 00 00 4 bits Z co-ordinate, relative to chunk
F0 00 00 00 4 bits X co-ordinate, relative to chunk

Status

Clientbound

?

Packet ID Field Name Field Type Notes
0x00 String


?

Packet ID Field Name Field Type Notes
0x01 Long

Serverbound

?

Packet ID Field Name Field Type Notes
0x00


?

Packet ID Field Name Field Type Notes
0x01 Long

Login

Clientbound

?

Packet ID Field Name Field Type Notes
0x00 String


?

Packet ID Field Name Field Type Notes
0x01 String
Length Short
Byte array
Length Short
Byte array


?

Packet ID Field Name Field Type Notes
0x02 UUID String
Name String


Serverbound

?

Packet ID Field Name Field Type Notes
0x00 Name String

?

Packet ID Field Name Field Type Notes
0x01 Length Short
Byte array
Length Short
Byte array

Plugin Channels

MC|RPack

Field Name Field Type Example Notes
Resource pack URL UTF8 string http://example.com/pack.zip
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