azures04/crafatar
1
0
Fork 0
mirror of https://github.com/azures04/crafatar.git synced 2026-05-06 19:10:38 +02:00
Code Issues Packages Projects Releases Wiki Activity

proper handling of steve/alex

Browse Source 
it's more complex than just even/odd UUID
This commit is contained in:
jomo
2015-02-27 01:07:09 +01:00
parent a55dde25a3
commit 9c8df06c6b
2 changed files with 60 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
modules/skins.js
View File

@@ -84,12 +84,23 @@ exp.resize_img = function(inname, size, callback) {
});
};
// returns "alex" or "steve" calculated by the +userId+
exp.default_skin = function(userId) {
if (Number("0x" + userId[31]) % 2 === 0) {
return "alex";
} else {
// returns "alex" or "steve" calculated by the +uuid+
exp.default_skin = function(uuid) {
if (uuid.length <= 16) {
// we can't get the
return "steve";
} else {
// great thanks to Minecrell for research into Minecraft and Java's UUID hashing!
// https://git.io/xJpV
// MC uses `uuid.hashCode() & 1` for alex
// that can be compacted to counting the LSBs of every 4th byte in the UUID
// an odd sum means alex, an even sum means steve
// XOR-ing all the LSBs gives us 1 for alex and 0 for steve
var lsbs_even = parseInt(uuid[07], 16) ^
parseInt(uuid[15], 16) ^
parseInt(uuid[23], 16) ^
parseInt(uuid[31], 16);
return lsbs_even ? "alex" : "steve";
}
};