local _M = {}

local char_to_hex = function(c)
  return string.format("%%%02X", string.byte(c))
end

local hex_to_char = function(x)
  return string.char(tonumber(x, 16))
end

function _M.encode(url)
  if url == nil then
    return
  end
  url = url:gsub("\n", "\r\n")
  url = url:gsub("([^%w ])", char_to_hex)
  url = url:gsub(" ", "+")
  return url
end

function _M.litepms_encode(url)
  if url == nil then
    return
  end
  url = url:gsub(" ", char_to_hex)  
  return url
end

_M.decode = function(url)
  if url == nil then
    return
  end
  url = url:gsub("+", " ")
  url = url:gsub("%%(%x%x)", hex_to_char)
  return url
end

return _M