Pre-release protocol

Revision as of 08:52, 18 April 2013 by SirCmpwn (talk | contribs)
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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.

New Packets


Changed Packets

Update Health (0x08)

Server to Client

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

Player Abilities (0xCA)


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.

These booleans are whether damage is disabled (god mode, '8' bit), whether the player can fly ('4' bit), whether the player is flying ('2' bit), and whether the player is in creative mode ('1' bit).

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 byte 12
Walking speed byte 25
Unknown byte[9] { 0xCC, 0xCD, 0x3D, 0xCC, 0xCC, 0xCD, 0x10, 0x00, 0x00 } Probably multiple fields.
Total Size: 4 bytes

Removed Packets


Changed Data Types


Protocol History