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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2005-2011. 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(xmerl_ucs).
-compile([verbose,report_warnings,warn_unused_vars]).
%%% Conversion to/from IANA recognised character sets
-export([to_unicode/2]).
%%% Micellaneous predicates
-export([is_iso10646/1, is_unicode/1, is_bmpchar/1, is_latin1/1, is_ascii/1,
is_visible_latin1/1, is_visible_ascii/1, is_iso646_basic/1,
is_incharset/2]).
%%% Conversion to/from RFC-1345 style mnemonic strings consisting
%%% of subsets of ISO-10646 with "escape" sequences.
%-export([from_mnemonic/1, from_mnemonic/2]).
%%% UCS-2, UCS-4, UTF-16, and UTF-8 encoding and decoding
-export([to_ucs2be/1,from_ucs2be/1, from_ucs2be/2]).
-export([to_ucs2le/1,from_ucs2le/1, from_ucs2le/2]).
-export([to_ucs4be/1,from_ucs4be/1, from_ucs4be/2]).
-export([to_ucs4le/1,from_ucs4le/1, from_ucs4le/2]).
-export([to_utf16be/1, from_utf16be/1, from_utf16be/2]).
-export([to_utf16le/1, from_utf16le/1, from_utf16le/2]).
-export([to_utf8/1, from_utf8/1]).
-export([from_latin9/1]).
%%% NB: Non-canonical UTF-8 encodings and incorrectly used
%%% surrogate-pair codes are disallowed by this code. There are
%%% important security implications concerning them. DO NOT REMOVE
%%% THE VARIOUS GUARDS AND TESTS THAT ENFORCE THIS POLICY.
%%% Test if Ch is a legitimate ISO-10646 character code
is_iso10646(Ch) when is_integer(Ch), Ch >= 0 ->
if Ch < 16#D800 -> true;
Ch < 16#E000 -> false; % Surrogates
Ch < 16#FFFE -> true;
Ch =< 16#FFFF -> false; % FFFE and FFFF (not characters)
Ch =< 16#7FFFFFFF -> true;
true -> false
end;
is_iso10646(_) -> false.
%%% Test if Ch is a legitimate ISO-10646 character code capable of
%%% being encoded in a UTF-16 string.
is_unicode(Ch) when Ch < 16#110000 -> is_iso10646(Ch);
is_unicode(_) -> false.
%%% Test if Ch is a legitimate ISO-10646 character code belonging to
%%% the basic multi-lingual plane (BMP).
is_bmpchar(Ch) when is_integer(Ch), Ch >= 0 ->
if Ch < 16#D800 -> true;
Ch < 16#E000 -> false; % Surrogates
Ch < 16#FFFE -> true;
true -> false
end;
is_bmpchar(_) -> false.
%%% Test for legitimate Latin-1 code
is_latin1(Ch) when is_integer(Ch), Ch >= 0, Ch =< 255 -> true;
is_latin1(_) -> false.
%%% Test for legitimate ASCII code
is_ascii(Ch) when is_integer(Ch), Ch >= 0, Ch =< 127 -> true;
is_ascii(_) -> false.
%%% Test for char an element of ISO-646.basic set
is_iso646_basic(Ch) when is_integer(Ch), Ch >= $\s ->
if Ch =< $Z ->
%% Everything in this range except $# $$ and $@
if Ch > $$ -> Ch =/= $@;
true -> Ch < $#
end;
%% Only $_ and $a .. $z in range above $Z
Ch > $z -> false;
Ch >= $a -> true;
true -> Ch =:= $_
end;
is_iso646_basic(_) ->
false.
%%% Test for char a visible Latin-1 char, i.e. a non-control Latin-1 char,
%%% excepting non-break space (but including space).
is_visible_latin1(Ch) when is_integer(Ch), Ch >= $\s ->
if Ch =< $~ -> true;
Ch >= 161 -> Ch =< 255
end;
is_visible_latin1(_) ->
false.
%%% Test for char a visible ASCII char, i.e. a non-control ASCII char
%%% (including space).
is_visible_ascii(Ch) when is_integer(Ch), Ch >= $\s -> Ch =< $~;
is_visible_ascii(_) -> false.
%%% UCS-4, big and little endian versions, encoding and decoding
to_ucs4be(List) when is_list(List) -> lists:flatmap(fun to_ucs4be/1, List);
to_ucs4be(Ch) -> char_to_ucs4be(Ch).
from_ucs4be(Bin) when is_binary(Bin) -> from_ucs4be(Bin,[],[]);
from_ucs4be(List) -> from_ucs4be(list_to_binary(List),[],[]).
from_ucs4be(Bin,Tail) when is_binary(Bin) -> from_ucs4be(Bin,[],Tail);
from_ucs4be(List,Tail) -> from_ucs4be(list_to_binary(List),[],Tail).
to_ucs4le(List) when is_list(List) -> lists:flatmap(fun to_ucs4le/1, List);
to_ucs4le(Ch) -> char_to_ucs4le(Ch).
from_ucs4le(Bin) when is_binary(Bin) -> from_ucs4le(Bin,[],[]);
from_ucs4le(List) -> from_ucs4le(list_to_binary(List),[],[]).
from_ucs4le(Bin,Tail) when is_binary(Bin) -> from_ucs4le(Bin,[],Tail);
from_ucs4le(List,Tail) -> from_ucs4le(list_to_binary(List),[],Tail).
%%% UCS-2, big and little endian versions, encoding and decoding
to_ucs2be(List) when is_list(List) -> lists:flatmap(fun to_ucs2be/1, List);
to_ucs2be(Ch) -> char_to_ucs2be(Ch).
from_ucs2be(Bin) when is_binary(Bin) -> from_ucs2be(Bin,[],[]);
from_ucs2be(List) -> from_ucs2be(list_to_binary(List),[],[]).
from_ucs2be(Bin,Tail) when is_binary(Bin) -> from_ucs2be(Bin,[],Tail);
from_ucs2be(List,Tail) -> from_ucs2be(list_to_binary(List),[],Tail).
to_ucs2le(List) when is_list(List) -> lists:flatmap(fun to_ucs2le/1, List);
to_ucs2le(Ch) -> char_to_ucs2le(Ch).
from_ucs2le(Bin) when is_binary(Bin) -> from_ucs2le(Bin,[],[]);
from_ucs2le(List) -> from_ucs2le(list_to_binary(List),[],[]).
from_ucs2le(Bin,Tail) when is_binary(Bin) -> from_ucs2le(Bin,[],Tail);
from_ucs2le(List,Tail) -> from_ucs2le(list_to_binary(List),[],Tail).
%%% UTF-16, big and little endian versions, encoding and decoding
to_utf16be(List) when is_list(List) -> lists:flatmap(fun to_utf16be/1, List);
to_utf16be(Ch) -> char_to_utf16be(Ch).
from_utf16be(Bin) when is_binary(Bin) -> from_utf16be(Bin,[],[]);
from_utf16be(List) -> from_utf16be(list_to_binary(List),[],[]).
from_utf16be(Bin,Tail) when is_binary(Bin) -> from_utf16be(Bin,[],Tail);
from_utf16be(List,Tail) -> from_utf16be(list_to_binary(List),[],Tail).
to_utf16le(List) when is_list(List) -> lists:flatmap(fun to_utf16le/1, List);
to_utf16le(Ch) -> char_to_utf16le(Ch).
from_utf16le(Bin) when is_binary(Bin) -> from_utf16le(Bin,[],[]);
from_utf16le(List) -> from_utf16le(list_to_binary(List),[],[]).
from_utf16le(Bin,Tail) when is_binary(Bin) -> from_utf16le(Bin,[],Tail);
from_utf16le(List,Tail) -> from_utf16le(list_to_binary(List),[],Tail).
%%% UTF-8 encoding and decoding
to_utf8(List) when is_list(List) -> lists:flatmap(fun to_utf8/1, List);
to_utf8(Ch) -> char_to_utf8(Ch).
from_utf8(Bin) when is_binary(Bin) -> from_utf8(binary_to_list(Bin));
from_utf8(List) ->
case expand_utf8(List) of
{Result,0} -> Result;
{_Res,_NumBadChar} ->
exit({ucs,{bad_utf8_character_code}})
end.
%%% Latin9 support
from_latin9(Bin) when is_binary(Bin) -> from_latin9(binary_to_list(Bin));
from_latin9(List) ->
[ latin9_to_ucs4(Char) || Char <- List].
latin9_to_ucs4(16#A4) -> 16#20AC;
latin9_to_ucs4(16#A6) -> 16#160;
latin9_to_ucs4(16#A8) -> 16#161;
latin9_to_ucs4(16#B4) -> 16#17D;
latin9_to_ucs4(16#B8) -> 16#17E;
latin9_to_ucs4(16#BC) -> 16#152;
latin9_to_ucs4(16#BD) -> 16#153;
latin9_to_ucs4(16#BE) -> 16#178;
latin9_to_ucs4(Other) -> Other.
%%% UCS-4 support
%%% Possible errors encoding UCS-4:
%%% - Non-character values (something other than 0 .. 2^31-1)
%%% - Surrogate-pair code in string.
%%% - 16#FFFE or 16#FFFF character in string.
%%% Possible errors decoding UCS-4:
%%% - Element out of range (i.e. the "sign" bit is set).
%%% - Surrogate-pair code in string.
%%% - 16#FFFE or 16#FFFF character in string.
char_to_ucs4be(Ch) ->
true = is_iso10646(Ch),
[(Ch bsr 24),
(Ch bsr 16) band 16#FF,
(Ch bsr 8) band 16#FF,
Ch band 16#FF].
from_ucs4be(<<Ch:32/big-signed-integer, Rest/binary>>,Acc,Tail) ->
if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF ->
exit({bad_character_code,Ch});
true ->
from_ucs4be(Rest,[Ch|Acc],Tail)
end;
from_ucs4be(<<>>,Acc,Tail) ->
lists:reverse(Acc,Tail);
from_ucs4be(Bin,Acc,Tail) ->
io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]),
{error,not_ucs4be}.
char_to_ucs4le(Ch) ->
true = is_iso10646(Ch),
[Ch band 16#FF,
(Ch bsr 8) band 16#FF,
(Ch bsr 16) band 16#FF,
(Ch bsr 24)].
from_ucs4le(<<Ch:32/little-signed-integer, Rest/binary>>,Acc,Tail) ->
if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF ->
exit({bad_character_code,Ch});
true ->
from_ucs4le(Rest,[Ch|Acc],Tail)
end;
from_ucs4le(<<>>,Acc,Tail) ->
lists:reverse(Acc,Tail);
from_ucs4le(Bin,Acc,Tail) ->
io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]),
{error,not_ucs4le}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% UCS-2 support
%%% FIXME! Don't know how to encode UCS-2!!
%%% Currently I just encode as UCS-4, but strips the 16 higher bits.
char_to_ucs2be(Ch) ->
true = is_iso10646(Ch),
[(Ch bsr 8) band 16#FF,
Ch band 16#FF].
from_ucs2be(<<Ch:16/big-signed-integer, Rest/binary>>,Acc,Tail) ->
if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF ->
exit({bad_character_code,Ch});
true ->
from_ucs2be(Rest,[Ch|Acc],Tail)
end;
from_ucs2be(<<>>,Acc,Tail) ->
lists:reverse(Acc,Tail);
from_ucs2be(Bin,Acc,Tail) ->
io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]),
{error,not_ucs2be}.
char_to_ucs2le(Ch) ->
true = is_iso10646(Ch),
[Ch band 16#FF,
(Ch bsr 8) band 16#FF].
from_ucs2le(<<Ch:16/little-signed-integer, Rest/binary>>,Acc,Tail) ->
if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF ->
exit({bad_character_code,Ch});
true ->
from_ucs2le(Rest,[Ch|Acc],Tail)
end;
from_ucs2le(<<>>,Acc,Tail) ->
lists:reverse(Acc,Tail);
from_ucs2le(Bin,Acc,Tail) ->
io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]),
{error,not_ucs2le}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% UTF-16 support
%%% Possible errors encoding UTF-16
%%% - Non-character values (something other than 0 .. 2^31-1)
%%% - Surrogate-pair code in string.
%%% - 16#FFFE or 16#FFFF character in string.
%%% NB: the UCS replacement char (U+FFFD) will be quietly substituted
%%% for unrepresentable chars (i.e. those geq to 2^20+2^16).
%%% Possible errors decoding UTF-16:
%%% - Unmatched surrogate-pair code in string.
%%% - 16#FFFE or 16#FFFF character in string.
char_to_utf16be(Ch) when is_integer(Ch), Ch >= 0 ->
if Ch =< 16#FFFF ->
if Ch < 16#D800; Ch >= 16#E000, Ch < 16#FFFE ->
[Ch bsr 8, Ch band 16#FF]
end;
Ch < 16#110000 ->
%% Encode with surrogate pair
X = Ch - 16#10000,
[16#D8 + (X bsr 18),
(X bsr 10) band 16#FF,
16#DC + ((X bsr 8) band 3),
X band 16#FF];
Ch =< 16#7FFFFFFF ->
%% Unrepresentable char: use REPLACEMENT CHARACTER (U+FFFD)
[16#FF, 16#FD]
end.
from_utf16be(<<Ch:16/big-unsigned-integer, Rest/binary>>, Acc, Tail)
when Ch < 16#D800; Ch > 16#DFFF ->
if Ch < 16#FFFE -> from_utf16be(Rest,[Ch|Acc],Tail) end;
from_utf16be(<<Hi:16/big-unsigned-integer, Lo:16/big-unsigned-integer,
Rest/binary>>, Acc, Tail)
when Hi >= 16#D800, Hi < 16#DC00, Lo >= 16#DC00, Lo =< 16#DFFF ->
%% Surrogate pair
Ch = ((Hi band 16#3FF) bsl 10) + (Lo band 16#3FF) + 16#10000,
from_utf16be(Rest, [Ch|Acc], Tail);
from_utf16be(<<>>,Acc,Tail) ->
lists:reverse(Acc,Tail);
from_utf16be(Bin,Acc,Tail) ->
io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]),
{error,not_utf16be}.
char_to_utf16le(Ch) when is_integer(Ch), Ch >= 0 ->
if Ch =< 16#FFFF ->
if Ch < 16#D800; Ch >= 16#E000, Ch < 16#FFFE ->
[Ch band 16#FF, Ch bsr 8]
end;
Ch < 16#110000 ->
%% Encode with surrogate pair
X = Ch - 16#10000,
[(X bsr 10) band 16#FF,
16#D8 + (X bsr 18),
X band 16#FF,
16#DC + ((X bsr 8) band 3)];
Ch =< 16#7FFFFFFF ->
%% Unrepresentable char: use REPLACEMENT CHARACTER (U+FFFD)
[16#FD, 16#FF]
end.
from_utf16le(<<Ch:16/little-unsigned-integer, Rest/binary>>, Acc, Tail)
when Ch < 16#D800; Ch > 16#DFFF ->
if Ch < 16#FFFE -> from_utf16le(Rest, [Ch|Acc], Tail) end;
from_utf16le(<<Hi:16/little-unsigned-integer, Lo:16/little-unsigned-integer,
Rest/binary>>, Acc, Tail)
when Hi >= 16#D800, Hi < 16#DC00, Lo >= 16#DC00, Lo =< 16#DFFF ->
%% Surrogate pair
Ch = ((Hi band 16#3FF) bsl 10) + (Lo band 16#3FF) + 16#10000,
from_utf16le(Rest, [Ch|Acc], Tail);
from_utf16le(<<>>,Acc,Tail) ->
lists:reverse(Acc,Tail);
from_utf16le(Bin,Acc,Tail) ->
io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]),
{error,not_utf16le}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% UTF-8 support
%%% Possible errors encoding UTF-8:
%%% - Non-character values (something other than 0 .. 2^31-1).
%%% - Surrogate pair code in string.
%%% - 16#FFFE or 16#FFFF character in string.
%%% Possible errors decoding UTF-8:
%%% - 10xxxxxx or 1111111x as initial byte.
%%% - Insufficient number of 10xxxxxx octets following an initial octet of
%%% multi-octet sequence.
%%% - Non-canonical encoding used.
%%% - Surrogate-pair code encoded as UTF-8.
%%% - 16#FFFE or 16#FFFF character in string.
char_to_utf8(Ch) when is_integer(Ch), Ch >= 0 ->
if Ch < 128 ->
%% 0yyyyyyy
[Ch];
Ch < 16#800 ->
%% 110xxxxy 10yyyyyy
[16#C0 + (Ch bsr 6),
128+(Ch band 16#3F)];
Ch < 16#10000 ->
%% 1110xxxx 10xyyyyy 10yyyyyy
if Ch < 16#D800; Ch > 16#DFFF, Ch < 16#FFFE ->
[16#E0 + (Ch bsr 12),
128+((Ch bsr 6) band 16#3F),
128+(Ch band 16#3F)]
end;
Ch < 16#200000 ->
%% 11110xxx 10xxyyyy 10yyyyyy 10yyyyyy
[16#F0+(Ch bsr 18),
128+((Ch bsr 12) band 16#3F),
128+((Ch bsr 6) band 16#3F),
128+(Ch band 16#3F)];
Ch < 16#4000000 ->
%% 111110xx 10xxxyyy 10yyyyyy 10yyyyyy 10yyyyyy
[16#F8+(Ch bsr 24),
128+((Ch bsr 18) band 16#3F),
128+((Ch bsr 12) band 16#3F),
128+((Ch bsr 6) band 16#3F),
128+(Ch band 16#3F)];
Ch < 16#80000000 ->
%% 1111110x 10xxxxyy 10yyyyyy 10yyyyyy 10yyyyyy 10yyyyyy
[16#FC+(Ch bsr 30),
128+((Ch bsr 24) band 16#3F),
128+((Ch bsr 18) band 16#3F),
128+((Ch bsr 12) band 16#3F),
128+((Ch bsr 6) band 16#3F),
128+(Ch band 16#3F)]
end.
%% expand_utf8([Byte]) -> {[UnicodeChar],NumberOfBadBytes}
%% Expand UTF8 byte sequences to ISO 10646/Unicode
%% charactes. Any illegal bytes are removed and the number of
%% bad bytes are returned.
%%
%% Reference:
%% RFC 3629: "UTF-8, a transformation format of ISO 10646".
expand_utf8(Str) ->
expand_utf8_1(Str, [], 0).
expand_utf8_1([C|Cs], Acc, Bad) when C < 16#80 ->
%% Plain Ascii character.
expand_utf8_1(Cs, [C|Acc], Bad);
expand_utf8_1([C1,C2|Cs], Acc, Bad) when C1 band 16#E0 =:= 16#C0,
C2 band 16#C0 =:= 16#80 ->
case ((C1 band 16#1F) bsl 6) bor (C2 band 16#3F) of
C when 16#80 =< C ->
expand_utf8_1(Cs, [C|Acc], Bad);
_ ->
%% Bad range.
expand_utf8_1(Cs, Acc, Bad+1)
end;
expand_utf8_1([C1,C2,C3|Cs], Acc, Bad) when C1 band 16#F0 =:= 16#E0,
C2 band 16#C0 =:= 16#80,
C3 band 16#C0 =:= 16#80 ->
case ((((C1 band 16#0F) bsl 6) bor (C2 band 16#3F)) bsl 6) bor
(C3 band 16#3F) of
C when 16#800 =< C ->
expand_utf8_1(Cs, [C|Acc], Bad);
_ ->
%% Bad range.
expand_utf8_1(Cs, Acc, Bad+1)
end;
expand_utf8_1([C1,C2,C3,C4|Cs], Acc, Bad) when C1 band 16#F8 =:= 16#F0,
C2 band 16#C0 =:= 16#80,
C3 band 16#C0 =:= 16#80,
C4 band 16#C0 =:= 16#80 ->
case ((((((C1 band 16#0F) bsl 6) bor (C2 band 16#3F)) bsl 6) bor
(C3 band 16#3F)) bsl 6) bor (C4 band 16#3F) of
C when 16#10000 =< C ->
expand_utf8_1(Cs, [C|Acc], Bad);
_ ->
%% Bad range.
expand_utf8_1(Cs, Acc, Bad+1)
end;
expand_utf8_1([_|Cs], Acc, Bad) ->
%% Ignore bad character.
expand_utf8_1(Cs, Acc, Bad+1);
expand_utf8_1([], Acc, Bad) -> {lists:reverse(Acc),Bad}.
%%% ----------------------------------------------------------------------------
%%% Translation to/from any IANA defined character set, given that a mapping
%%% exists. Don't care about validating valid subsets of Unicode
to_unicode(Input,Cs) when Cs=='ansi_x3.4-1968';Cs=='iso-ir-6';
Cs=='ansi_x3.4-1986';Cs=='iso_646.irv:1991';
Cs=='ascii';Cs=='iso646-us';Cs=='us-ascii';Cs=='us';
Cs=='ibm367';Cs=='cp367';Cs=='csascii' -> % US-ASCII
Input;
to_unicode(Input,Cs) when Cs=='iso-10646-utf-1';Cs=='csiso10646utf1' ->
Input;
to_unicode(Input,Cs) when Cs=='iso_646.basic:1983';Cs=='ref';
Cs=='csiso646basic1983' ->
Input;
to_unicode(Input,Cs) when Cs=='iso_8859-1:1987';Cs=='iso-ir-100';
Cs=='iso_8859-1';Cs=='iso-8859-1';Cs=='latin1';
Cs=='l1';Cs=='ibm819';
Cs=='cp819';Cs=='csisolatin1' ->
Input;
to_unicode(Input,Cs) when Cs=='iso_8859-15';Cs=='iso-8859-15';Cs=='latin9' ->
from_latin9(Input);
% to_unicode(Input,Cs) when Cs=='mnemonic';Cs=='"mnemonic+ascii+38';
% Cs=='mnem';Cs=='"mnemonic+ascii+8200' ->
% from_mnemonic(Input);
to_unicode(Input,Cs) when Cs=='iso-10646-ucs-2';Cs=='csunicode' ->
from_ucs2be(Input); % Guess byteorder
to_unicode(Input,Cs) when Cs=='iso-10646-ucs-4';Cs=='csucs4' ->
from_ucs4be(Input); % Guess byteorder
to_unicode(Input,Cs) when Cs=='utf-16be';Cs=='utf-16' ->
from_utf16be(Input);
to_unicode(Input,'utf-16le') ->
from_utf16le(Input);
to_unicode(Input,'utf-8') ->
from_utf8(Input);
to_unicode(Input,Charset) ->
exit({bad_character_code,Input,Charset}).
%ucs_data:to_unicode(Input,Charset).
%%% Tests if Char is in Charset.
%%% Do this by trying to convert it into unicode, if possible a mapping was
%%% found and we are ok.
is_incharset(In,Cs) when Cs=='ansi_x3.4-1968';Cs=='iso-ir-6';
Cs=='ansi_x3.4-1986';Cs=='iso_646.irv:1991';
Cs=='ascii';Cs=='iso646-us';Cs=='us-ascii';Cs=='us';
Cs=='ibm367';Cs=='cp367';Cs=='csascii' -> % US-ASCII
if
is_integer(In) -> is_ascii(In);
is_list(In) -> test_charset(fun is_ascii/1,In)
end;
is_incharset(In,Cs) when Cs=='iso-10646-utf-1';Cs=='csiso10646utf1' ->
if
is_integer(In) -> is_unicode(In);
is_list(In) -> test_charset(fun is_unicode/1, In)
end;
is_incharset(In,Cs) when Cs=='iso_646.basic:1983';Cs=='ref';
Cs=='csiso646basic1983' ->
if
is_integer(In) -> is_iso646_basic(In);
is_list(In) -> test_charset(fun is_iso646_basic/1, In)
end;
is_incharset(In,Cs) when Cs=='iso_8859-1:1987';Cs=='iso-ir-100';
Cs=='iso_8859-1';Cs=='iso-8859-1';
Cs=='latin1';Cs=='l1';Cs=='ibm819';
Cs=='cp819';Cs=='csisolatin1' ->
if
is_integer(In) -> is_latin1(In);
is_list(In) -> test_charset(fun is_latin1/1, In)
end;
is_incharset(In,Charset) when is_integer(In) ->
case to_unicode([In],Charset) of
{error,unsupported_charset} ->
{error,unsupported_charset};
{error,_} ->
false;
[Int] when is_integer(Int) ->
true
end;
is_incharset(In,Charset) when is_list(In) ->
case to_unicode(In,Charset) of
{error,unsupported_charset} ->
{error,unsupported_charset};
{error,_} ->
false;
[Int] when is_integer(Int) ->
true
end.
test_charset(Fun,Input) ->
case lists:all(Fun, Input) of
true ->
true;
_ ->
false
end.
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