local function _from_length_coded_bin(data, pos)
local first = strbyte(data, pos)
--print("LCB: first: ", first)
if not first then
return nil, pos
end
if first >= 0 and first <= 250 then
return first, pos + 1
end
if first == 251 then
return null, pos + 1
end
if first == 252 then
pos = pos + 1
return _get_byte2(data, pos)
end
if first == 253 then
pos = pos + 1
return _get_byte3(data, pos)
end
if first == 254 then
pos = pos + 1
return _get_byte8(data, pos)
end
return false, pos + 1
end
local function _from_length_coded_str(data, pos)
local len
len, pos = _from_length_coded_bin(data, pos)
if len == nil or len == null then
return null, pos
end
return sub(data, pos, pos + len - 1), pos + len
end
由以上代码中，可以看出_from_length_coded_bin会返回false中的结果，
但_from_length_coded_str中并没有对false结果进行判断，会不会造成不预期的错误？
