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tds

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Microsoft SQL Server client (Elixir implementation of the MS TDS protocol)

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tds lib tds protocol token.ex
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lib/tds/protocol/token.ex 

defmodule Tds.Protocol.Token do

  import Bitwise



  # @tokens [

  #   {0x88, :alt_metadata},

  #   {0xD3, :alt_row},

  #   {0x81, :col_metadata},

  #   {0xA5, :col_info},

  #   {0xFD, :done},

  #   {0xFE, :done_proc},

  #   {0xFF, :done_in_proc},

  #   {0xE3, :env_change},

  #   {0xAA, :error},

  #   {0xAE, :feature_ext_ack},

  #   {0xEE, :fed_auth_info},

  #   {0xAB, :info},

  #   {0xAD, :login_ack},

  #   {0xD2, :nbc_row},

  #   {0x78, :offset},

  #   {0xA9, :order},

  #   {0x79, :return_status},

  #   {0xAC, :return_value},

  #   {0xD1, :row},

  #   {0xED, :sspi},

  #   {0xA4, :tab_name}

  # ]



  def class(token) when token > 0 and token <= 0xFF do

    case token &&& 0b00110000 do

      0b0000_0000 -> {:variable, :count}

      0b0010_0000 -> {:variable, :length}

      0b0001_0000 -> {:fixed, 0}

      0b0011_0000 -> {:fixed, fixed_length(token)}

    end

  end



  defp fixed_length(token) do

    case token &&& 0b00001100 do

      0b0000_0000 -> 1

      0b0000_0100 -> 2

      0b0000_1000 -> 4

      0b0000_1100 -> 8

    end

  end

end