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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(asn1rt).
%% Runtime functions for ASN.1 (i.e encode, decode)
-include("asn1_records.hrl").
-export([encode/2,encode/3,decode/3,load_driver/0,unload_driver/0,info/1]).
-export([utf8_binary_to_list/1,utf8_list_to_binary/1]).
encode(Module,{Type,Term}) ->
encode(Module,Type,Term).
encode(Module,Type,Term) ->
case catch apply(Module,encode,[Type,Term]) of
{'EXIT',undef} ->
{error,{asn1,{undef,Module,Type}}};
Result ->
Result
end.
decode(Module,Type,Bytes) ->
case catch apply(Module,decode,[Type,Bytes]) of
{'EXIT',undef} ->
{error,{asn1,{undef,Module,Type}}};
Result ->
Result
end.
%% Remove in R16A
load_driver() ->
ok.
unload_driver() ->
ok.
info(Module) ->
case catch apply(Module,info,[]) of
{'EXIT',{undef,_Reason}} ->
{error,{asn1,{undef,Module,info}}};
Result ->
{ok,Result}
end.
%% utf8_binary_to_list/1 transforms a utf8 encoded binary to a list of
%% unicode elements, where each element is the unicode integer value
%% of a utf8 character.
%% Bin is a utf8 encoded value. The return value is either {ok,Val} or
%% {error,Reason}. Val is a list of integers, where each integer is a
%% unicode character value.
utf8_binary_to_list(Bin) when is_binary(Bin) ->
utf8_binary_to_list(Bin,[]).
utf8_binary_to_list(<<>>,Acc) ->
{ok,lists:reverse(Acc)};
utf8_binary_to_list(Bin,Acc) ->
Len = utf8_binary_len(Bin),
case catch split_binary(Bin,Len) of
{CharBin,RestBin} ->
case utf8_binary_char(CharBin) of
C when is_integer(C) ->
utf8_binary_to_list(RestBin,[C|Acc]);
Err -> Err
end;
Err -> {error,{asn1,{bad_encoded_utf8string,Err}}}
end.
utf8_binary_len(<<0:1,_:7,_/binary>>) ->
1;
utf8_binary_len(<<1:1,1:1,0:1,_:5,_/binary>>) ->
2;
utf8_binary_len(<<1:1,1:1,1:1,0:1,_:4,_/binary>>) ->
3;
utf8_binary_len(<<1:1,1:1,1:1,1:1,0:1,_:3,_/binary>>) ->
4;
utf8_binary_len(<<1:1,1:1,1:1,1:1,1:1,0:1,_:2,_/binary>>) ->
5;
utf8_binary_len(<<1:1,1:1,1:1,1:1,1:1,1:1,0:1,_:1,_/binary>>) ->
6;
utf8_binary_len(Bin) ->
{error,{asn1,{bad_utf8_length,Bin}}}.
utf8_binary_char(<<0:1,Int:7>>) ->
Int;
utf8_binary_char(<<_:2,0:1,Int1:5,1:1,0:1,Int2:6>>) ->
(Int1 bsl 6) bor Int2;
utf8_binary_char(<<_:3,0:1,Int1:4,1:1,0:1,Int2:6,1:1,0:1,Int3:6>>) ->
<<Res:16>> = <<Int1:4,Int2:6,Int3:6>>,
Res;
utf8_binary_char(<<_:4,0:1,Int1:3,Rest/binary>>) ->
<<1:1,0:1,Int2:6,1:1,0:1,Int3:6,1:1,0:1,Int4:6>> = Rest,
<<Res:24>> = <<0:3,Int1:3,Int2:6,Int3:6,Int4:6>>,
Res;
utf8_binary_char(<<_:5,0:1,Int1:2,Rest/binary>>) ->
<<1:1,0:1,Int2:6,1:1,0:1,Int3:6,1:1,0:1,Int4:6,1:1,0:1,Int5:6>> = Rest,
<<Res:32>> = <<0:6,Int1:2,Int2:6,Int3:6,Int4:6,Int5:6>>,
Res;
utf8_binary_char(<<_:6,0:1,I:1,Rest/binary>>) ->
<<1:1,0:1,Int2:6,1:1,0:1,Int3:6,1:1,0:1,Int4:6,1:1,0:1,
Int5:6,1:1,0:1,Int6:6>> = Rest,
<<Res:32>> = <<0:1,I:1,Int2:6,Int3:6,Int4:6,Int5:6,Int6:6>>,
Res;
utf8_binary_char(Err) ->
{error,{asn1,{bad_utf8_character_encoding,Err}}}.
%% macros used for utf8 encoding
-define(bit1to6_into_utf8byte(I),16#80 bor (I band 16#3f)).
-define(bit7to12_into_utf8byte(I),16#80 bor ((I band 16#fc0) bsr 6)).
-define(bit13to18_into_utf8byte(I),16#80 bor ((I band 16#3f000) bsr 12)).
-define(bit19to24_into_utf8byte(I),16#80 bor ((Int band 16#fc0000) bsr 18)).
-define(bit25to30_into_utf8byte(I),16#80 bor ((Int band 16#3f000000) bsr 24)).
%% utf8_list_to_binary/1 transforms a list of integers to a
%% binary. Each element in the input list has the unicode (integer)
%% value of an utf8 character.
%% The return value is either {ok,Bin} or {error,Reason}. The
%% resulting binary is utf8 encoded.
utf8_list_to_binary(List) ->
utf8_list_to_binary(List,[]).
utf8_list_to_binary([],Acc) when is_list(Acc) ->
{ok,list_to_binary(lists:reverse(Acc))};
utf8_list_to_binary([],Acc) ->
{error,{asn1,Acc}};
utf8_list_to_binary([H|T],Acc) ->
case catch utf8_encode(H,Acc) of
NewAcc when is_list(NewAcc) ->
utf8_list_to_binary(T,NewAcc);
Err -> Err
end.
utf8_encode(Int,Acc) when Int < 128 ->
%% range 16#00000000 - 16#0000007f
%% utf8 encoding: 0xxxxxxx
[Int|Acc];
utf8_encode(Int,Acc) when Int < 16#800 ->
%% range 16#00000080 - 16#000007ff
%% utf8 encoding: 110xxxxx 10xxxxxx
[?bit1to6_into_utf8byte(Int),16#c0 bor (Int bsr 6)|Acc];
utf8_encode(Int,Acc) when Int < 16#10000 ->
%% range 16#00000800 - 16#0000ffff
%% utf8 encoding: 1110xxxx 10xxxxxx 10xxxxxx
[?bit1to6_into_utf8byte(Int),?bit7to12_into_utf8byte(Int),
16#e0 bor ((Int band 16#f000) bsr 12)|Acc];
utf8_encode(Int,Acc) when Int < 16#200000 ->
%% range 16#00010000 - 16#001fffff
%% utf8 encoding: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
[?bit1to6_into_utf8byte(Int),?bit7to12_into_utf8byte(Int),
?bit13to18_into_utf8byte(Int),
16#f0 bor ((Int band 16#1c0000) bsr 18)|Acc];
utf8_encode(Int,Acc) when Int < 16#4000000 ->
%% range 16#00200000 - 16#03ffffff
%% utf8 encoding: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
[?bit1to6_into_utf8byte(Int),?bit7to12_into_utf8byte(Int),
?bit13to18_into_utf8byte(Int),?bit19to24_into_utf8byte(Int),
16#f8 bor ((Int band 16#3000000) bsr 24)|Acc];
utf8_encode(Int,Acc) ->
%% range 16#04000000 - 16#7fffffff
%% utf8 encoding: 1111110x 10xxxxxx ...(total 6 bytes) 10xxxxxx
[?bit1to6_into_utf8byte(Int),?bit7to12_into_utf8byte(Int),
?bit13to18_into_utf8byte(Int),?bit19to24_into_utf8byte(Int),
?bit25to30_into_utf8byte(Int),
16#fc bor ((Int band 16#40000000) bsr 30)|Acc].
|
