AstralTransRocketries/node-minecraft-protocol
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Merge pull request #346 from deathcap/lengthprefixednbt

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Add compressedNbt data type, used in MC 1.7
This commit is contained in:
Romain Beaumont 2016-02-15 11:22:52 +01:00
commit 88c20cf795
1 changed files with 31 additions and 0 deletions
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31
src/datatypes/minecraft.js
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@ -1,10 +1,12 @@
const nbt = require('prismarine-nbt'); const nbt = require('prismarine-nbt');
const UUID = require('uuid-1345'); const UUID = require('uuid-1345');
const zlib = require('zlib');
module.exports = { module.exports = {
'UUID': [readUUID, writeUUID, 16], 'UUID': [readUUID, writeUUID, 16],
'nbt': [readNbt, writeNbt, sizeOfNbt], 'nbt': [readNbt, writeNbt, sizeOfNbt],
'optionalNbt':[readOptionalNbt,writeOptionalNbt,sizeOfOptionalNbt], 'optionalNbt':[readOptionalNbt,writeOptionalNbt,sizeOfOptionalNbt],
'compressedNbt':[readCompressedNbt,writeCompressedNbt,sizeOfCompressedNbt],
'restBuffer': [readRestBuffer, writeRestBuffer, sizeOfRestBuffer], 'restBuffer': [readRestBuffer, writeRestBuffer, sizeOfRestBuffer],
'entityMetadataLoop': [readEntityMetadata, writeEntityMetadata, sizeOfEntityMetadata] 'entityMetadataLoop': [readEntityMetadata, writeEntityMetadata, sizeOfEntityMetadata]
}; };
@ -54,6 +56,35 @@ function sizeOfOptionalNbt(value) {
return nbt.proto.sizeOf(value,"nbt"); return nbt.proto.sizeOf(value,"nbt");
} }
// Length-prefixed compressed NBT, see differences: http://wiki.vg/index.php?title=Slot_Data&diff=6056&oldid=4753
function readCompressedNbt(buffer, offset) {
const length = buffer.readInt16BE(offset);
if(length == -1) return {size:2};
const compressedNbt = buffer.slice(offset+2, offset+2+length);
const nbtBuffer = zlib.gunzipSync(compressedNbt); // TODO: async
return nbt.proto.read(nbtBuffer,0,"nbt");
}
function writeCompressedNbt(value, buffer, offset) {
if(value==undefined) {
buffer.writeInt16BE(-1,offset);
return offset+2;
}
buffer.writeInt16(sizeOfNbt(value),offset);
return nbt.proto.write(value,buffer,offset+2,"nbt");
}
function sizeOfCompressedNbt(value) {
if(value==undefined)
return 2;
return 2+nbt.proto.sizeOf(value,"nbt");
}
function readRestBuffer(buffer, offset) { function readRestBuffer(buffer, offset) {
return { return {
value: buffer.slice(offset), value: buffer.slice(offset),