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slightly cleaner readPosition

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Josh Wolfe 2015-03-26 18:47:46 -07:00
parent 158beb3cc3
commit 23945f54c3
1 changed files with 12 additions and 7 deletions
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19
src/protocol.js
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@ -1095,18 +1095,23 @@ function readBool(buffer, offset) {
}
function readPosition(buffer, offset) {
var longVal = readLong(buffer, offset).value; // I wish I could do destructuring...
var x = longVal[0] >> 6;
if(x>33554432) x-=67108864;
var y = ((longVal[0] & 0x3F) << 6) | ((longVal[1] >> 26) & 0x3f);
if(y>2048) y-=4096;
var z = longVal[1] & 0x3FFFFFF;
if(z>33554432) z-=67108864;
var longVal = readLong(buffer, offset).value;
var x = signExtend26(longVal[0] >> 6);
var y = signExtend12(((longVal[0] & 0x3f) << 6) | ((longVal[1] >> 26) & 0x3f));
var z = signExtend26(longVal[1] & 0x3FFFFFF);
return {
value: { x: x, y: y, z: z },
size: 8
};
}
function signExtend26(value) {
if (value > 0x2000000) value -= 0x4000000;
return value;
}
function signExtend12(value) {
if (value > 0x800) value -= 0x1000;
return value;
}
function readSlot(buffer, offset) {
var value = {};