Computercraft sorter API

-- Sorter ID API, by TTFTCUTS.

local sortDir = { [0]=0,[1]=1,[2]=2,[3]=3,[4]=4,[5]=5,["down"] = 0, ["up"] = 1, ["-Z"] = 2, ["+Z"] = 3, ["-X"] = 4, ["+X"] = 5, ["+Y"] = 1, ["-Y"] = 0};
sortDir.south = sortDir["+Z"];
sortDir.east = sortDir["+X"];
sortDir.north = sortDir["-Z"];
sortDir.west = sortDir["-X"];

function dir(d)
    return sortDir[d];
end

function magic()
    return 7683961; -- WORLD DEPENDANT
end

function item2sid( id, damage )
    local m = magic();

    local sid = bit.blshift(id, 15);
    sid = bit.bxor( m, sid );
    sid = bit.bxor( sid, damage );

    return sid;
end

function sid2item( sid )
    local m = magic();
    local h = bit.bxor(sid, m);

    local id = bit.brshift( h, 15 );
    id = math.floor(id);

    local damage = bit.bxor( h, bit.blshift(id, 15) );

    local item = { ["id"]=id, ["damage"]=damage };
    return item;
end

function calibrate( id, damage, sid )
    local m = bit.bxor(sid, damage);
    m = bit.bxor( m, bit.blshift( id, 15 ) );

    return m;
end