unicode:encoding_to_bom/1

从编码里生成一个二进制的 UTF 字节顺序标记

用法：

encoding_to_bom(InEncoding) -> Bin

内部实现：

-spec encoding_to_bom(InEncoding) -> Bin when
      Bin :: binary(),
      InEncoding :: encoding().

encoding_to_bom(unicode) ->
    <<239,187,191>>;
encoding_to_bom(utf8) ->
    <<239,187,191>>;
encoding_to_bom(utf16) ->
    <<254,255>>;
encoding_to_bom({utf16,big}) ->
    <<254,255>>;
encoding_to_bom({utf16,little}) ->
    <<255,254>>;
encoding_to_bom(utf32) ->
    <<0,0,254,255>>;
encoding_to_bom({utf32,big}) ->
    <<0,0,254,255>>;
encoding_to_bom({utf32,little}) ->
    <<255,254,0,0>>;
encoding_to_bom(latin1) ->
    <<>>.

从输入编码 InEncoding 里生成一个二进制的 UTF 字节顺序标记

unicode:encoding_to_bom(unicode).

unicode:encoding_to_bom(utf8).

unicode:encoding_to_bom(utf16).

unicode:encoding_to_bom({utf16,big}).

unicode:encoding_to_bom({utf16,little}).

unicode:encoding_to_bom(utf32).

unicode:encoding_to_bom({utf32,big}).

unicode:encoding_to_bom({utf32,little}).

unicode:encoding_to_bom(latin1).