Difference between revisions of "Classic Protocol Extension"
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| + | ===EmoteFix=== | ||
| + | :Presence of this extension indicates that the client can render emotes in chat properly, without padding or suffixes that are required for vanilla client. This extension does not define any new packets. | ||
Revision as of 16:32, 11 October 2012
Contents
Negotiation
Extended clients should use magic number of 0x42 for the padding byte of the Player Identification packet. All standard/non-extended clients pad this packet with 0x00, so extended servers should be able to easily notice extended clients. All standard/non-extended servers will ignore the modified padding byte, preserving compatibility.
When the server sees that padding byte is 0x42, it should immediately reply with an ExtInfo packet, followed by zero or more ExtEntry packets, and await a response (ExtInfo packet) from the client.
After the client has sent its identification packet, it should await a response. If the server responds with an ExtInfo packet, it should parse it and any ExtEntry packets that follow. Client should then compare its locally-supported set of extensions with the list of extensions provided by the server, and find an intersection of these sets. These are the mutually-supported extensions.
At this time, client should send ExtInfo packet of its own, followed by the list of mutually-supported extensions. After receiving the last of ExtEntry packets, server should activate the mutually-supported extensions, and resume normal login procedure.
ExtInfo Packet
Packet ID Field Name Field Type Example Notes 0x10 AppName string MyServerClient or server software name ExtensionCount short 1 Between 0 and 32767 Total Size: 67 bytes
ExtEntry Packet
Packet ID Field Name Field Type Example Notes 0x11 ExtName string MyExtensionName of a supported extension Version int 1 Total Size: 69 bytes
Extensions
ClickDistance
- Used to extend or restrict the distance at which client may click blocks, controlled by the server. Click range is given in player-space units (32 units per block). Upon receiving a SetClickDistance packet, client should immediately apply the change.
SetClickDistance packet
- Server to Client
Packet ID Field Name Field Type Example Notes 0x20 Distance short 160 Total Size: 3 bytes
EmoteFix
- Presence of this extension indicates that the client can render emotes in chat properly, without padding or suffixes that are required for vanilla client. This extension does not define any new packets.
