AstralTransRocketries/node-minecraft-protocol
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Add optionalLengthPrefixedNbt data type, used in MC 1.7

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This commit is contained in:
deathcap 2016-02-14 22:21:29 -08:00
parent e2e0d7a930
commit 1a22263c03
1 changed files with 24 additions and 0 deletions
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24
src/datatypes/minecraft.js
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@ -5,6 +5,7 @@ module.exports = {
'UUID': [readUUID, writeUUID, 16],
'nbt': [readNbt, writeNbt, sizeOfNbt],
'optionalNbt':[readOptionalNbt,writeOptionalNbt,sizeOfOptionalNbt],
'optionalLengthPrefixedNbt':[readOptionalLengthPrefixedNbt,writeOptionalLengthPrefixedNbt,sizeOfOptionalLengthPrefixedNbt],
'restBuffer': [readRestBuffer, writeRestBuffer, sizeOfRestBuffer],
'entityMetadataLoop': [readEntityMetadata, writeEntityMetadata, sizeOfEntityMetadata]
};
@ -54,6 +55,29 @@ function sizeOfOptionalNbt(value) {
return nbt.proto.sizeOf(value,"nbt");
}
// Length-prefixed optional NBT, short instead of null byte: http://wiki.vg/index.php?title=Slot_Data&diff=6056&oldid=4753
function readOptionalLengthPrefixedNbt(buffer, offset) {
if(buffer.readInt16BE(offset) == -1) return {size:2};
return nbt.proto.read(buffer,offset,"nbt");
}
function writeOptionalLengthPrefixedNbt(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 sizeOfOptionalLengthPrefixedNbt(value) {
if(value==undefined)
return 2;
return 2+nbt.proto.sizeOf(value,"nbt");
}
function readRestBuffer(buffer, offset) {
return {
value: buffer.slice(offset),