50 lines
1.2 KiB
Lua
50 lines
1.2 KiB
Lua
|
local util = require("util")
|
||
|
|
local bit32 = require("bit32")
|
||
|
|
|
||
|
|
local nibbleArray = {}
|
||
|
|
|
||
|
|
local defaultsTable = {
|
||
|
|
array = {}
|
||
|
|
}
|
||
|
|
|
||
|
|
function nibbleArray:new(sizeOrTable)
|
||
|
|
local newTable = util.deepCopyTable(defaultsTable) or {}
|
||
|
|
|
||
|
|
if type(sizeOrTable) == "number" then
|
||
|
|
for i = 1, sizeOrTable do
|
||
|
|
table.insert(newTable.array, 0)
|
||
|
|
end
|
||
|
|
elseif type(sizeOrTable) == "table" then
|
||
|
|
self.array = sizeOrTable
|
||
|
|
end
|
||
|
|
|
||
|
|
-- Set this table as this """class"""'s metatable
|
||
|
|
setmetatable(newTable, self)
|
||
|
|
self.__index = self
|
||
|
|
|
||
|
|
return newTable
|
||
|
|
end
|
||
|
|
|
||
|
|
function nibbleArray:get(index)
|
||
|
|
local arrayIndex = math.floor(index * 0.5)
|
||
|
|
if bit32.band(index, 1) == 0 then
|
||
|
|
return bit32.band(self.array[arrayIndex + 1], 0xf)
|
||
|
|
else
|
||
|
|
return bit32.band(bit32.rshift(self.array[arrayIndex + 1], 4), 0xf)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
function nibbleArray:set(index, value)
|
||
|
|
local arrayIndex = math.floor(index * 0.5)
|
||
|
|
if bit32.band(index, 1) == 0 then
|
||
|
|
self.array[arrayIndex + 1] = bit32.bor(bit32.band(self.array[arrayIndex + 1], 0xf0), bit32.band(value, 0xf))
|
||
|
|
else
|
||
|
|
self.array[arrayIndex + 1] = bit32.bor(bit32.band(self.array[arrayIndex + 1], 0xf), bit32.rshift(bit32.band(value, 0xf), -4))
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
function nibbleArray:toBuffer()
|
||
|
|
return self.array
|
||
|
|
end
|
||
|
|
|
||
|
|
return nibbleArray
|