Difference between revisions of "Pre-release protocol"
Ammaraskar (talk | contribs) (Fixed packet size) |
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Revision as of 02:33, 19 April 2013
This page documents the changes from the last stable Minecraft release (currently 1.5, protocol 60) to the current pre-release, 13w16a (protocol 62). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
Contents
New Packets
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Changed Packets
Update Health (0x08)
Server to Client
Sent by the server to update/set the health of the player it is sent to. Added in protocol version 5.
Food saturation acts as a food "overcharge". Food values will not decrease while the saturation is over zero. Players logging in automatically get a saturation of 5.0. Eating food increases the saturation as well as the food bar.
Packet ID | Field Name | Field Type | Example | Notes |
0x08 | Health | float | 20.0 | 0 or less = dead, 20 = full HP |
Food | short | 20 | 0 - 20 | |
Food Saturation | float | 5.0 | Seems to vary from 0.0 to 5.0 in integer increments | |
Total Size: | 11 bytes |
Entity Action (0x13)
Client to Server
Sent at least when crouching, leaving a bed, or sprinting. To send action animation to client use 0x28. The client will send this with Action ID = 3 when "Leave Bed" is clicked.
Packet ID | Field Name | Field Type | Example | Notes |
0x13 | EID | int | 55534
|
Player ID |
Action ID | byte | 1
|
The ID of the action, see below. | |
Unknown | int | 0
|
Something to do with horses. Ranged from 0 -> 90 | |
Total Size: | 10 bytes |
Action ID can be one of the following values:
ID | Action |
---|---|
1 | Crouch |
2 | Uncrouch |
3 | Leave bed |
4 | Start sprinting |
5 | Stop sprinting |
Attach Entity (0x27)
Server to Client
This packet is sent when a player has been attached to an entity (e.g. Minecart)
Packet ID | Field Name | Field Type | Example | Notes |
0x27 | Entity ID | int | 1298
|
The player entity ID being attached |
Vehicle ID | int | 1805
|
The vehicle entity ID attached to (-1 for unattaching) | |
Leash | boolean | false
|
If set to true, leashes the entity to the vehicle | |
Total Size: | 10 bytes |
Player Abilities (0xCA)
Two-Way
The latter 2 bytes are used to indicate the walking and flying speeds respectively, while the first byte is used to determine the value of 4 booleans.
The flags are whether damage is disabled (god mode, 8, bit 3), whether the player can fly (4, bit 2), whether the player is flying (2, bit 1), and whether the player is in creative mode (1, bit 0).
To get the values of these booleans, simply AND (&) the byte with 1,2,4 and 8 respectively, to get the 0 or 1 bitwise value. To set them OR (|) them with their repspective masks. The vanilla client sends this packet when the player starts/stops flying with the second parameter changed accordingly. All other parameters are ignored by the vanilla server.
Packet ID | Field Name | Field Type | Example | Notes |
0xCA | Flags | byte | 5 | |
Flying speed | float | 0.05 | previous integer value divided by 250 | |
Walking speed | float | 0.1 | previous integer value divided by 250 | |
Total Size: | 10 bytes |
Removed Packets
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Changed Data Types
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Protocol History
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