rawio.lua

local raw = {}

local bit32 = require("bit32")
local fs = require("filesystem")


function raw.createFileStream(path, mode)
    if fs.exists(path) then
        return io.open(path, mode)
    end
    return nil, "file not found"
end

function raw.new(stream, mode)
    local tabl = {}
    tabl.stream = stream

    tabl.skip = function(bytes)
        tabl.stream:seek("cur", bytes)
    end
    tabl.getBytes = function(bytes)
        local bytes = tabl.read(bytes)
        tabl.stream:seek("cur", -bytes)
        return bytes
    end
    tabl.readInt = function()
        local b1 = tabl.readByte(1)
        local b2 = tabl.readByte(1)
        local b3 = tabl.readByte(1)
        local b4 = tabl.readByte(1)
        return bit32.bor(bit32.bor(bit32.bor(bit32.lshift(b4, 24), bit32.lshift(b3, 16)), bit32.lshift(b2, 8)), b1)
    end
    tabl.hasNext = function()
        local streamCurr = tabl.stream:seek("cur", 0)
        local streamEnd = tabl.stream:seek("end", 0)
        tabl.stream:seek("set", streamCurr)
        return streamEnd > streamCurr
    end
    tabl.read = function(bytes)
        return tabl.stream:read(bytes)
    end
    tabl.readByte = function()
        return string.byte(tabl.read(1))
    end
    tabl.close = function()
        return tabl.stream:close()
    end
    return tabl
end

return raw