| local bcoder = require("snet.utilities.bcoder") |
| local ffi = require("ffi") |
|
|
| local bstream = {} |
| local bstream_class = {} |
|
|
| bstream_class.bytes = "" |
| bstream_class.write_ptr = 1 |
| bstream_class.read_ptr = 1 |
|
|
| function bstream_class:write(v_type, v) |
| if type(v_type) ~= 'string' then return false end |
|
|
| local before = self.bytes:sub(1, self.write_ptr - 1) |
| local after = self.bytes:sub(self.write_ptr, #self.bytes) |
|
|
| if v_type == BS_STRING then self.bytes = before .. v .. after |
| else self.bytes = before .. bcoder.encode(v_type, v) .. after end |
|
|
| self.write_ptr = self.write_ptr + (v_type == BS_STRING and #v or ffi.sizeof(v_type)) |
| return true |
| end |
|
|
| function bstream_class:read(v_type, v_len) |
| if type(v_type) ~= 'string' then return false end |
|
|
| local result = 0 |
| if v_type == BS_STRING then result = self.bytes:sub(self.read_ptr, self.read_ptr + v_len - 1) |
| else result = bcoder.decode(v_type, self.bytes:sub(self.read_ptr, self.read_ptr + ffi.sizeof(v_type) - 1)) end |
|
|
| self.read_ptr = self.read_ptr + (v_type == BS_STRING and v_len or ffi.sizeof(v_type)) |
| return result |
| end |
|
|
| function bstream.new(bytes) |
| local new_object = {} |
| setmetatable(new_object, { |
| __index = bstream_class, |
| __tostring = function() |
| return "SNET BStream" |
| end |
| }) |
| if type(bytes) == "string" then |
| new_object.bytes = bytes |
| elseif type(bytes) == "SNET BStream" then |
| new_object.bytes = bytes.bytes |
| end |
| return new_object |
| end |
|
|
| return bstream |
