%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(unicode).
-export([characters_to_list/1, characters_to_list_int/2,
characters_to_binary/1, characters_to_binary_int/2,
characters_to_binary/3,
bom_to_encoding/1, encoding_to_bom/1]).
-export_type([chardata/0, charlist/0, encoding/0, external_chardata/0,
external_charlist/0, latin1_char/0, latin1_chardata/0,
latin1_charlist/0, latin1_binary/0, unicode_binary/0]).
-type encoding() :: 'latin1' | 'unicode' | 'utf8'
| 'utf16' | {'utf16', endian()}
| 'utf32' | {'utf32', endian()}.
-type endian() :: 'big' | 'little'.
-type unicode_binary() :: binary().
-type charlist() ::
maybe_improper_list(char() | unicode_binary() | charlist(),
unicode_binary() | nil()).
-type chardata() :: charlist() | unicode_binary().
-type external_unicode_binary() :: binary().
-type external_chardata() :: external_charlist() | external_unicode_binary().
-type external_charlist() ::
maybe_improper_list(char() |
external_unicode_binary() |
external_charlist(),
external_unicode_binary() | nil()).
-type latin1_binary() :: binary().
-type latin1_char() :: byte().
-type latin1_chardata() :: latin1_charlist() | latin1_binary().
-type latin1_charlist() ::
maybe_improper_list(latin1_char() |
latin1_binary() |
latin1_charlist(),
latin1_binary() | nil()).
%%% BIFs
%%%
%%% characters_to_binary/2 (will trap to characters_to_binary_int/2
%%% if InEncoding is not {latin1 | unicode | utf8})
%%% characters_to_list/2 (will trap to characters_to_list_int/2 if
%%% InEncoding is not {latin1 | unicode | utf8})
-export([bin_is_7bit/1, characters_to_binary/2, characters_to_list/2]).
-spec bin_is_7bit(Binary) -> boolean() when
Binary :: binary().
bin_is_7bit(_) ->
erlang:nif_error(undef).
-spec characters_to_binary(Data, InEncoding) -> Result when
Data :: latin1_chardata() | chardata() | external_chardata(),
InEncoding :: encoding(),
Result :: binary()
| {error, binary(), RestData}
| {incomplete, binary(), binary()},
RestData :: latin1_chardata() | chardata() | external_chardata().
characters_to_binary(_, _) ->
erlang:nif_error(undef).
-spec characters_to_list(Data, InEncoding) -> Result when
Data :: latin1_chardata() | chardata() | external_chardata(),
InEncoding :: encoding(),
Result :: list()
| {error, list(), RestData}
| {incomplete, list(), binary()},
RestData :: latin1_chardata() | chardata() | external_chardata().
characters_to_list(_, _) ->
erlang:nif_error(undef).
%%% End of BIFs
-spec characters_to_list(Data) -> Result when
Data :: latin1_chardata() | chardata() | external_chardata(),
Result :: list()
| {error, list(), RestData}
| {incomplete, list(), binary()},
RestData :: latin1_chardata() | chardata() | external_chardata().
characters_to_list(ML) ->
unicode:characters_to_list(ML,unicode).
characters_to_list_int(ML, Encoding) ->
try
do_characters_to_list(ML,Encoding)
catch
error:AnyError ->
TheError = case AnyError of
system_limit ->
system_limit;
_ ->
badarg
end,
{'EXIT',{new_stacktrace,[{Mod,_,L,_}|Rest]}} =
(catch erlang:error(new_stacktrace,
[ML,Encoding])),
erlang:raise(error,TheError,[{Mod,characters_to_list,L}|Rest])
end.
% XXX: Optimize me!
do_characters_to_list(ML, Encoding) ->
case unicode:characters_to_binary(ML,Encoding) of
Bin when is_binary(Bin) ->
unicode:characters_to_list(Bin,utf8);
{error,Encoded,Rest} ->
{error,unicode:characters_to_list(Encoded,utf8),Rest};
{incomplete, Encoded2, Rest2} ->
{incomplete,unicode:characters_to_list(Encoded2,utf8),Rest2}
end.
-spec characters_to_binary(Data) -> Result when
Data :: latin1_chardata() | chardata() | external_chardata(),
Result :: binary()
| {error, binary(), RestData}
| {incomplete, binary(), binary()},
RestData :: latin1_chardata() | chardata() | external_chardata().
characters_to_binary(ML) ->
try
unicode:characters_to_binary(ML,unicode)
catch
error:AnyError ->
TheError = case AnyError of
system_limit ->
system_limit;
_ ->
badarg
end,
{'EXIT',{new_stacktrace,[{Mod,_,L,_}|Rest]}} =
(catch erlang:error(new_stacktrace,
[ML])),
erlang:raise(error,TheError,[{Mod,characters_to_binary,L}|Rest])
end.
characters_to_binary_int(ML,InEncoding) ->
try
characters_to_binary_int(ML,InEncoding,unicode)
catch
error:AnyError ->
TheError = case AnyError of
system_limit ->
system_limit;
_ ->
badarg
end,
{'EXIT',{new_stacktrace,[{Mod,_,L,_}|Rest]}} =
(catch erlang:error(new_stacktrace,
[ML,InEncoding])),
erlang:raise(error,TheError,[{Mod,characters_to_binary,L}|Rest])
end.
-spec characters_to_binary(Data, InEncoding, OutEncoding) -> Result when
Data :: latin1_chardata() | chardata() | external_chardata(),
InEncoding :: encoding(),
OutEncoding :: encoding(),
Result :: binary()
| {error, binary(), RestData}
| {incomplete, binary(), binary()},
RestData :: latin1_chardata() | chardata() | external_chardata().
characters_to_binary(ML, latin1, latin1) when is_binary(ML) ->
ML;
characters_to_binary(ML, latin1, Uni) when is_binary(ML) and ((Uni =:= utf8) or (Uni =:= unicode)) ->
case unicode:bin_is_7bit(ML) of
true ->
ML;
false ->
try
characters_to_binary_int(ML,latin1,utf8)
catch
error:AnyError ->
TheError = case AnyError of
system_limit ->
system_limit;
_ ->
badarg
end,
{'EXIT',{new_stacktrace,[{Mod,_,L,_}|Rest]}} =
(catch erlang:error(new_stacktrace,
[ML,latin1,Uni])),
erlang:raise(error,TheError,
[{Mod,characters_to_binary,L}|Rest])
end
end;
characters_to_binary(ML,Uni,latin1) when is_binary(ML) and ((Uni =:= utf8) or (Uni =:= unicode)) ->
case unicode:bin_is_7bit(ML) of
true ->
ML;
false ->
try
characters_to_binary_int(ML,utf8,latin1)
catch
error:AnyError ->
TheError = case AnyError of
system_limit ->
system_limit;
_ ->
badarg
end,
{'EXIT',{new_stacktrace,[{Mod,_,L,_}|Rest]}} =
(catch erlang:error(new_stacktrace,
[ML,Uni,latin1])),
erlang:raise(error,TheError,
[{Mod,characters_to_binary,L}|Rest])
end
end;
characters_to_binary(ML, InEncoding, OutEncoding) ->
try
characters_to_binary_int(ML,InEncoding,OutEncoding)
catch
error:AnyError ->
TheError = case AnyError of
system_limit ->
system_limit;
_ ->
badarg
end,
{'EXIT',{new_stacktrace,[{Mod,_,L,_}|Rest]}} =
(catch erlang:error(new_stacktrace,
[ML,InEncoding,OutEncoding])),
erlang:raise(error,TheError,[{Mod,characters_to_binary,L}|Rest])
end.
characters_to_binary_int(ML, InEncoding, OutEncoding) when
InEncoding =:= latin1, OutEncoding =:= unicode;
InEncoding =:= latin1, OutEncoding =:= utf8;
InEncoding =:= unicode, OutEncoding =:= unicode;
InEncoding =:= unicode, OutEncoding =:= utf8;
InEncoding =:= utf8, OutEncoding =:= unicode;
InEncoding =:= utf8, OutEncoding =:= utf8 ->
unicode:characters_to_binary(ML,InEncoding);
characters_to_binary_int(ML, InEncoding, OutEncoding) ->
{InTrans,Limit} = case OutEncoding of
latin1 -> {i_trans_chk(InEncoding),255};
_ -> {i_trans(InEncoding),case InEncoding of latin1 -> 255; _ -> 16#10FFFF end}
end,
OutTrans = o_trans(OutEncoding),
Res =
ml_map(ML,
fun(Part,Accum) when is_binary(Part) ->
case InTrans(Part) of
List when is_list(List) ->
Tail = OutTrans(List),
<<Accum/binary, Tail/binary>>;
{error, Translated, Rest} ->
Tail = OutTrans(Translated),
{error, <<Accum/binary,Tail/binary>>, Rest};
{incomplete, Translated, Rest, Missing} ->
Tail = OutTrans(Translated),
{incomplete, <<Accum/binary,Tail/binary>>, Rest,
Missing}
end;
(Part, Accum) when is_integer(Part), Part =< Limit ->
case OutTrans([Part]) of
Binary when is_binary(Binary) ->
<<Accum/binary, Binary/binary>>;
{error, _, [Part]} ->
{error,Accum,[Part]}
end;
(Part, Accum) ->
{error, Accum, [Part]}
end,<<>>),
case Res of
{incomplete,A,B,_} ->
{incomplete,A,B};
_ ->
Res
end.
-spec bom_to_encoding(Bin) -> {Encoding, Length} when
Bin :: binary(),
Encoding :: 'latin1' | 'utf8'
| {'utf16', endian()}
| {'utf32', endian()},
Length :: non_neg_integer().
bom_to_encoding(<<239,187,191,_/binary>>) ->
{utf8,3};
bom_to_encoding(<<0,0,254,255,_/binary>>) ->
{{utf32,big},4};
bom_to_encoding(<<255,254,0,0,_/binary>>) ->
{{utf32,little},4};
bom_to_encoding(<<254,255,_/binary>>) ->
{{utf16,big},2};
bom_to_encoding(<<255,254,_/binary>>) ->
{{utf16,little},2};
bom_to_encoding(Bin) when is_binary(Bin) ->
{latin1,0}.
-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) ->
<<>>.
cbv(utf8,<<1:1,1:1,0:1,_:5>>) ->
1;
cbv(utf8,<<1:1,1:1,1:1,0:1,_:4,R/binary>>) ->
case R of
<<>> ->
2;
<<1:1,0:1,_:6>> ->
1;
_ ->
false
end;
cbv(utf8,<<1:1,1:1,1:1,1:1,0:1,_:3,R/binary>>) ->
case R of
<<>> ->
3;
<<1:1,0:1,_:6>> ->
2;
<<1:1,0:1,_:6,1:1,0:1,_:6>> ->
1;
_ ->
false
end;
cbv(utf8,_) ->
false;
cbv({utf16,big},<<A:8>>) when A =< 215; A >= 224 ->
1;
cbv({utf16,big},<<54:6,_:2>>) ->
3;
cbv({utf16,big},<<54:6,_:10>>) ->
2;
cbv({utf16,big},<<54:6,_:10,55:6,_:2>>) ->
1;
cbv({utf16,big},_) ->
false;
cbv({utf16,little},<<_:8>>) ->
1; % or 3, we'll see
cbv({utf16,little},<<_:8,54:6,_:2>>) ->
2;
cbv({utf16,little},<<_:8,54:6,_:2,_:8>>) ->
1;
cbv({utf16,little},_) ->
false;
cbv({utf32,big}, <<0:8>>) ->
3;
cbv({utf32,big}, <<0:8,X:8>>) when X =< 16 ->
2;
cbv({utf32,big}, <<0:8,X:8,Y:8>>)
when X =< 16, ((X > 0) or ((Y =< 215) or (Y >= 224))) ->
1;
cbv({utf32,big},_) ->
false;
cbv({utf32,little},<<_:8>>) ->
3;
cbv({utf32,little},<<_:8,_:8>>) ->
2;
cbv({utf32,little},<<X:8,255:8,0:8>>) when X =:= 254; X =:= 255 ->
false;
cbv({utf32,little},<<_:8,Y:8,X:8>>)
when X =< 16, ((X > 0) or ((Y =< 215) or (Y >= 224))) ->
1;
cbv({utf32,little},_) ->
false.
ml_map([],_,{{Inc,X},Accum}) ->
{incomplete, Accum, Inc, X};
ml_map([],_Fun,Accum) ->
Accum;
ml_map([Part|_] = Whole,_,{{Incomplete, _}, Accum}) when is_integer(Part) ->
{error, Accum, [Incomplete | Whole]};
ml_map([Part|T],Fun,Accum) when is_integer(Part) ->
case Fun(Part,Accum) of
Bin when is_binary(Bin) ->
case ml_map(T,Fun,Bin) of
Bin2 when is_binary(Bin2) ->
Bin2;
{error, Converted, Rest} ->
{error, Converted, Rest};
{incomplete, Converted, Rest,X} ->
{incomplete, Converted, Rest,X}
end;
% Can not be incomplete - it's an integer
{error, Converted, Rest} ->
{error, Converted, [Rest|T]}
end;
ml_map([Part|T],Fun,{{Incomplete,Missing}, Accum}) when is_binary(Part) ->
% Ok, how much is needed to fill in the incomplete part?
case byte_size(Part) of
N when N >= Missing ->
<<FillIn:Missing/binary,Trailing/binary>> = Part,
NewPart = <<Incomplete/binary,FillIn/binary>>,
ml_map([NewPart,Trailing|T], Fun, Accum);
M ->
NewIncomplete = <<Incomplete/binary, Part/binary>>,
NewMissing = Missing - M,
ml_map(T,Fun,{{NewIncomplete, NewMissing}, Accum})
end;
ml_map([Part|T],Fun,Accum) when is_binary(Part), byte_size(Part) > 8192 ->
<<Part1:8192/binary,Part2/binary>> = Part,
ml_map([Part1,Part2|T],Fun,Accum);
ml_map([Part|T],Fun,Accum) when is_binary(Part) ->
case Fun(Part,Accum) of
Bin when is_binary(Bin) ->
ml_map(T,Fun,Bin);
{incomplete, Converted, Rest, Missing} ->
ml_map(T,Fun,{{Rest, Missing},Converted});
{error, Converted, Rest} ->
{error, Converted, [Rest|T]}
end;
ml_map([List|T],Fun,Accum) when is_list(List) ->
case ml_map(List,Fun,Accum) of
Bin when is_binary(Bin) ->
ml_map(T,Fun,Bin);
{error, Converted,Rest} ->
{error, Converted, [Rest | T]};
{incomplete, Converted,Rest,N} ->
ml_map(T,Fun,{{Rest,N},Converted})
end;
ml_map(Bin,Fun,{{Incomplete,Missing},Accum}) when is_binary(Bin) ->
case byte_size(Bin) of
N when N >= Missing ->
ml_map([Incomplete,Bin],Fun,Accum);
M ->
{incomplete, Accum, <<Incomplete/binary, Bin/binary>>, Missing - M}
end;
ml_map(Part,Fun,Accum) when is_binary(Part), byte_size(Part) > 8192 ->
<<Part1:8192/binary,Part2/binary>> = Part,
ml_map([Part1,Part2],Fun,Accum);
ml_map(Bin,Fun,Accum) when is_binary(Bin) ->
Fun(Bin,Accum).
i_trans(latin1) ->
fun(Bin) -> binary_to_list(Bin) end;
i_trans(unicode) ->
i_trans(utf8);
i_trans(utf8) ->
fun do_i_utf8/1;
i_trans(utf16) ->
fun do_i_utf16_big/1;
i_trans({utf16,big}) ->
fun do_i_utf16_big/1;
i_trans({utf16,little}) ->
fun do_i_utf16_little/1;
i_trans(utf32) ->
fun do_i_utf32_big/1;
i_trans({utf32,big}) ->
fun do_i_utf32_big/1;
i_trans({utf32,little}) ->
fun do_i_utf32_little/1.
i_trans_chk(latin1) ->
fun(Bin) -> binary_to_list(Bin) end;
i_trans_chk(unicode) ->
i_trans_chk(utf8);
i_trans_chk(utf8) ->
fun do_i_utf8_chk/1;
i_trans_chk(utf16) ->
fun do_i_utf16_big_chk/1;
i_trans_chk({utf16,big}) ->
fun do_i_utf16_big_chk/1;
i_trans_chk({utf16,little}) ->
fun do_i_utf16_little_chk/1;
i_trans_chk(utf32) ->
fun do_i_utf32_big_chk/1;
i_trans_chk({utf32,big}) ->
fun do_i_utf32_big_chk/1;
i_trans_chk({utf32,little}) ->
fun do_i_utf32_little_chk/1.
o_trans(latin1) ->
fun(L) -> list_to_binary(L) end;
o_trans(unicode) ->
o_trans(utf8);
o_trans(utf8) ->
fun(L) ->
do_o_binary(fun(One) ->
<<One/utf8>>
end, L)
end;
o_trans(utf16) ->
fun(L) ->
do_o_binary(fun(One) ->
<<One/utf16>>
end, L)
end;
o_trans({utf16,big}) ->
o_trans(utf16);
o_trans({utf16,little}) ->
fun(L) ->
do_o_binary(fun(One) ->
<<One/utf16-little>>
end, L)
end;
o_trans(utf32) ->
fun(L) ->
do_o_binary(fun(One) ->
<<One/utf32>>
end, L)
end;
o_trans({utf32,big}) ->
o_trans(utf32);
o_trans({utf32,little}) ->
fun(L) ->
do_o_binary(fun(One) ->
<<One/utf32-little>>
end, L)
end.
do_o_binary(F,L) ->
case do_o_binary2(F,L) of
{Tag,List,R} ->
{Tag,erlang:iolist_to_binary(List),R};
List ->
erlang:iolist_to_binary(List)
end.
-dialyzer({no_improper_lists, do_o_binary2/2}).
do_o_binary2(_F,[]) ->
<<>>;
do_o_binary2(F,[H|T]) ->
case (catch F(H)) of
{'EXIT',_} ->
{error,<<>>,[H|T]};
Bin when is_binary(Bin) ->
case do_o_binary2(F,T) of
{error,Bin2,Rest} ->
{error,[Bin|Bin2],Rest};
Bin3 ->
[Bin|Bin3]
end
end.
%% Specific functions only allowing codepoints in latin1 range
do_i_utf8_chk(<<>>) ->
[];
do_i_utf8_chk(<<U/utf8,R/binary>>) when U =< 255 ->
case do_i_utf8_chk(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf8_chk(<<_/utf8,_/binary>> = Bin) ->
{error, [], Bin};
do_i_utf8_chk(Bin) when is_binary(Bin) ->
case cbv(utf8,Bin) of
N when is_integer(N) ->
{incomplete, [], Bin,N};
false ->
{error, [], Bin}
end.
do_i_utf16_big_chk(<<>>) ->
[];
do_i_utf16_big_chk(<<U/utf16,R/binary>>) when U =< 255 ->
case do_i_utf16_big_chk(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf16_big_chk(<<_/utf16,_/binary>> = Bin) ->
{error, [], Bin};
do_i_utf16_big_chk(Bin) when is_binary(Bin) ->
case cbv({utf16,big},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
do_i_utf16_little_chk(<<>>) ->
[];
do_i_utf16_little_chk(<<U/utf16-little,R/binary>>) when U =< 255 ->
case do_i_utf16_little_chk(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf16_little_chk(<<_/utf16-little,_/binary>> = Bin) ->
{error, [], Bin};
do_i_utf16_little_chk(Bin) when is_binary(Bin) ->
case cbv({utf16,little},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
do_i_utf32_big_chk(<<>>) ->
[];
do_i_utf32_big_chk(<<U/utf32,R/binary>>) when U =< 255 ->
case do_i_utf32_big_chk(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
L when is_list(L) ->
[U|L]
end;
do_i_utf32_big_chk(<<_/utf32,_/binary>> = Bin) ->
{error, [], Bin};
do_i_utf32_big_chk(Bin) when is_binary(Bin) ->
case cbv({utf32,big},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
do_i_utf32_little_chk(<<>>) ->
[];
do_i_utf32_little_chk(<<U/utf32-little,R/binary>>) when U =< 255 ->
case do_i_utf32_little_chk(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
L when is_list(L) ->
[U|L]
end;
do_i_utf32_little_chk(<<_/utf32-little,_/binary>> = Bin) ->
{error, [], Bin};
do_i_utf32_little_chk(Bin) when is_binary(Bin) ->
case cbv({utf32,little},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
%% General versions
do_i_utf8(<<>>) ->
[];
do_i_utf8(<<U/utf8,R/binary>>) ->
case do_i_utf8(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf8(Bin) when is_binary(Bin) ->
case cbv(utf8,Bin) of
N when is_integer(N) ->
{incomplete, [], Bin,N};
false ->
{error, [], Bin}
end.
do_i_utf16_big(<<>>) ->
[];
do_i_utf16_big(<<U/utf16,R/binary>>) ->
case do_i_utf16_big(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf16_big(Bin) when is_binary(Bin) ->
case cbv({utf16,big},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
do_i_utf16_little(<<>>) ->
[];
do_i_utf16_little(<<U/utf16-little,R/binary>>) ->
case do_i_utf16_little(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf16_little(Bin) when is_binary(Bin) ->
case cbv({utf16,little},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
do_i_utf32_big(<<>>) ->
[];
do_i_utf32_big(<<U/utf32,R/binary>>) ->
case do_i_utf32_big(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf32_big(Bin) when is_binary(Bin) ->
case cbv({utf32,big},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
do_i_utf32_little(<<>>) ->
[];
do_i_utf32_little(<<U/utf32-little,R/binary>>) ->
case do_i_utf32_little(R) of
{error,Trans,Rest} ->
{error, [U|Trans], Rest};
{incomplete,Trans,Rest,N} ->
{incomplete, [U|Trans], Rest, N};
L when is_list(L) ->
[U|L]
end;
do_i_utf32_little(Bin) when is_binary(Bin) ->
case cbv({utf32,little},Bin) of
N when is_integer(N) ->
{incomplete, [], Bin, N};
false ->
{error, [], Bin}
end.
