mirror of
https://github.com/processone/ejabberd.git
synced 2024-12-28 17:38:54 +01:00
6290bac932
the user for the current virual host only and does not require to type the hostname (EJAB-116). * src/jlib.erl: String to JID conversion now returns an error if the JID string contains two arobases. SVN Revision: 588
634 lines
15 KiB
Erlang
634 lines
15 KiB
Erlang
%%%----------------------------------------------------------------------
|
|
%%% File : jlib.erl
|
|
%%% Author : Alexey Shchepin <alexey@sevcom.net>
|
|
%%% Purpose :
|
|
%%% Created : 23 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
|
|
%%% Id : $Id$
|
|
%%%----------------------------------------------------------------------
|
|
|
|
-module(jlib).
|
|
-author('alexey@sevcom.net').
|
|
-vsn('$Revision$ ').
|
|
|
|
-export([make_result_iq_reply/1,
|
|
make_error_reply/3,
|
|
make_error_reply/2,
|
|
make_error_element/2,
|
|
make_correct_from_to_attrs/3,
|
|
replace_from_to_attrs/3,
|
|
replace_from_to/3,
|
|
remove_attr/2,
|
|
make_jid/3,
|
|
make_jid/1,
|
|
string_to_jid/1,
|
|
jid_to_string/1,
|
|
is_nodename/1,
|
|
tolower/1,
|
|
nodeprep/1,
|
|
nameprep/1,
|
|
resourceprep/1,
|
|
jid_tolower/1,
|
|
jid_remove_resource/1,
|
|
jid_replace_resource/2,
|
|
get_iq_namespace/1,
|
|
iq_query_info/1,
|
|
is_iq_request_type/1,
|
|
iq_to_xml/1,
|
|
parse_xdata_submit/1,
|
|
timestamp_to_iso/1,
|
|
timestamp_to_xml/1,
|
|
now_to_utc_string/1,
|
|
now_to_local_string/1,
|
|
datetime_string_to_timestamp/1,
|
|
decode_base64/1,
|
|
encode_base64/1]).
|
|
|
|
-include("jlib.hrl").
|
|
|
|
%send_iq(From, To, ID, SubTags) ->
|
|
% ok.
|
|
|
|
make_result_iq_reply({xmlelement, Name, Attrs, SubTags}) ->
|
|
NewAttrs = make_result_iq_reply_attrs(Attrs),
|
|
{xmlelement, Name, NewAttrs, SubTags}.
|
|
|
|
make_result_iq_reply_attrs(Attrs) ->
|
|
To = xml:get_attr("to", Attrs),
|
|
From = xml:get_attr("from", Attrs),
|
|
Attrs1 = lists:keydelete("to", 1, Attrs),
|
|
Attrs2 = lists:keydelete("from", 1, Attrs1),
|
|
Attrs3 = case To of
|
|
{value, ToVal} ->
|
|
[{"from", ToVal} | Attrs2];
|
|
_ ->
|
|
Attrs2
|
|
end,
|
|
Attrs4 = case From of
|
|
{value, FromVal} ->
|
|
[{"to", FromVal} | Attrs3];
|
|
_ ->
|
|
Attrs3
|
|
end,
|
|
Attrs5 = lists:keydelete("type", 1, Attrs4),
|
|
Attrs6 = [{"type", "result"} | Attrs5],
|
|
Attrs6.
|
|
|
|
make_error_reply({xmlelement, Name, Attrs, SubTags}, Code, Desc) ->
|
|
NewAttrs = make_error_reply_attrs(Attrs),
|
|
{xmlelement, Name, NewAttrs, SubTags ++ [{xmlelement, "error",
|
|
[{"code", Code}],
|
|
[{xmlcdata, Desc}]}]}.
|
|
|
|
make_error_reply({xmlelement, Name, Attrs, SubTags}, Error) ->
|
|
NewAttrs = make_error_reply_attrs(Attrs),
|
|
{xmlelement, Name, NewAttrs, SubTags ++ [Error]}.
|
|
|
|
make_error_reply_attrs(Attrs) ->
|
|
To = xml:get_attr("to", Attrs),
|
|
From = xml:get_attr("from", Attrs),
|
|
Attrs1 = lists:keydelete("to", 1, Attrs),
|
|
Attrs2 = lists:keydelete("from", 1, Attrs1),
|
|
Attrs3 = case To of
|
|
{value, ToVal} ->
|
|
[{"from", ToVal} | Attrs2];
|
|
_ ->
|
|
Attrs2
|
|
end,
|
|
Attrs4 = case From of
|
|
{value, FromVal} ->
|
|
[{"to", FromVal} | Attrs3];
|
|
_ ->
|
|
Attrs3
|
|
end,
|
|
Attrs5 = lists:keydelete("type", 1, Attrs4),
|
|
Attrs6 = [{"type", "error"} | Attrs5],
|
|
Attrs6.
|
|
|
|
make_error_element(Code, Desc) ->
|
|
{xmlelement, "error",
|
|
[{"code", Code}],
|
|
[{xmlcdata, Desc}]}.
|
|
|
|
make_correct_from_to_attrs(From, To, Attrs) ->
|
|
Attrs1 = lists:keydelete("from", 1, Attrs),
|
|
Attrs2 = case xml:get_attr("to", Attrs) of
|
|
{value, _} ->
|
|
Attrs1;
|
|
_ ->
|
|
[{"to", To} | Attrs1]
|
|
end,
|
|
Attrs3 = [{"from", From} | Attrs2],
|
|
Attrs3.
|
|
|
|
|
|
replace_from_to_attrs(From, To, Attrs) ->
|
|
Attrs1 = lists:keydelete("to", 1, Attrs),
|
|
Attrs2 = lists:keydelete("from", 1, Attrs1),
|
|
Attrs3 = [{"to", To} | Attrs2],
|
|
Attrs4 = [{"from", From} | Attrs3],
|
|
Attrs4.
|
|
|
|
replace_from_to(From, To, {xmlelement, Name, Attrs, Els}) ->
|
|
NewAttrs = replace_from_to_attrs(jlib:jid_to_string(From),
|
|
jlib:jid_to_string(To),
|
|
Attrs),
|
|
{xmlelement, Name, NewAttrs, Els}.
|
|
|
|
|
|
remove_attr(Attr, {xmlelement, Name, Attrs, Els}) ->
|
|
NewAttrs = lists:keydelete(Attr, 1, Attrs),
|
|
{xmlelement, Name, NewAttrs, Els}.
|
|
|
|
|
|
make_jid(User, Server, Resource) ->
|
|
case nodeprep(User) of
|
|
error -> error;
|
|
LUser ->
|
|
case nameprep(Server) of
|
|
error -> error;
|
|
LServer ->
|
|
case resourceprep(Resource) of
|
|
error -> error;
|
|
LResource ->
|
|
#jid{user = User,
|
|
server = Server,
|
|
resource = Resource,
|
|
luser = LUser,
|
|
lserver = LServer,
|
|
lresource = LResource}
|
|
end
|
|
end
|
|
end.
|
|
|
|
make_jid({User, Server, Resource}) ->
|
|
make_jid(User, Server, Resource).
|
|
|
|
string_to_jid(J) ->
|
|
string_to_jid1(J, "").
|
|
|
|
string_to_jid1([$@ | _J], "") ->
|
|
error;
|
|
string_to_jid1([$@ | J], N) ->
|
|
string_to_jid2(J, lists:reverse(N), "");
|
|
string_to_jid1([$/ | _J], "") ->
|
|
error;
|
|
string_to_jid1([$/ | J], N) ->
|
|
string_to_jid3(J, "", lists:reverse(N), "");
|
|
string_to_jid1([C | J], N) ->
|
|
string_to_jid1(J, [C | N]);
|
|
string_to_jid1([], "") ->
|
|
error;
|
|
string_to_jid1([], N) ->
|
|
make_jid("", lists:reverse(N), "").
|
|
|
|
%% Only one "@" is admitted per JID
|
|
string_to_jid2([$@ | _J], _N, _S) ->
|
|
error;
|
|
string_to_jid2([$/ | _J], _N, "") ->
|
|
error;
|
|
string_to_jid2([$/ | J], N, S) ->
|
|
string_to_jid3(J, N, lists:reverse(S), "");
|
|
string_to_jid2([C | J], N, S) ->
|
|
string_to_jid2(J, N, [C | S]);
|
|
string_to_jid2([], _N, "") ->
|
|
error;
|
|
string_to_jid2([], N, S) ->
|
|
make_jid(N, lists:reverse(S), "").
|
|
|
|
string_to_jid3([C | J], N, S, R) ->
|
|
string_to_jid3(J, N, S, [C | R]);
|
|
string_to_jid3([], N, S, R) ->
|
|
make_jid(N, S, lists:reverse(R)).
|
|
|
|
jid_to_string(#jid{user = User, server = Server, resource = Resource}) ->
|
|
jid_to_string({User, Server, Resource});
|
|
jid_to_string({Node, Server, Resource}) ->
|
|
S1 = case Node of
|
|
"" ->
|
|
"";
|
|
_ ->
|
|
Node ++ "@"
|
|
end,
|
|
S2 = S1 ++ Server,
|
|
S3 = case Resource of
|
|
"" ->
|
|
S2;
|
|
_ ->
|
|
S2 ++ "/" ++ Resource
|
|
end,
|
|
S3.
|
|
|
|
|
|
is_nodename([]) ->
|
|
false;
|
|
is_nodename(J) ->
|
|
nodeprep(J) /= error.
|
|
|
|
|
|
%tolower_c(C) when C >= $A, C =< $Z ->
|
|
% C + 32;
|
|
%tolower_c(C) ->
|
|
% C.
|
|
|
|
-define(LOWER(Char),
|
|
if
|
|
Char >= $A, Char =< $Z ->
|
|
Char + 32;
|
|
true ->
|
|
Char
|
|
end).
|
|
|
|
%tolower(S) ->
|
|
% lists:map(fun tolower_c/1, S).
|
|
|
|
%tolower(S) ->
|
|
% [?LOWER(Char) || Char <- S].
|
|
|
|
% Not tail-recursive but it seems works faster than variants above
|
|
tolower([C | Cs]) ->
|
|
if
|
|
C >= $A, C =< $Z ->
|
|
[C + 32 | tolower(Cs)];
|
|
true ->
|
|
[C | tolower(Cs)]
|
|
end;
|
|
tolower([]) ->
|
|
[].
|
|
|
|
%tolower([C | Cs]) when C >= $A, C =< $Z ->
|
|
% [C + 32 | tolower(Cs)];
|
|
%tolower([C | Cs]) ->
|
|
% [C | tolower(Cs)];
|
|
%tolower([]) ->
|
|
% [].
|
|
|
|
|
|
nodeprep(S) when length(S) < 1024 ->
|
|
R = stringprep:nodeprep(S),
|
|
if
|
|
length(R) < 1024 -> R;
|
|
true -> error
|
|
end;
|
|
nodeprep(_) ->
|
|
error.
|
|
|
|
nameprep(S) when length(S) < 1024 ->
|
|
R = stringprep:nameprep(S),
|
|
if
|
|
length(R) < 1024 -> R;
|
|
true -> error
|
|
end;
|
|
nameprep(_) ->
|
|
error.
|
|
|
|
resourceprep(S) when length(S) < 1024 ->
|
|
R = stringprep:resourceprep(S),
|
|
if
|
|
length(R) < 1024 -> R;
|
|
true -> error
|
|
end;
|
|
resourceprep(_) ->
|
|
error.
|
|
|
|
|
|
jid_tolower(#jid{luser = U, lserver = S, lresource = R}) ->
|
|
{U, S, R};
|
|
jid_tolower({U, S, R}) ->
|
|
case nodeprep(U) of
|
|
error -> error;
|
|
LUser ->
|
|
case nameprep(S) of
|
|
error -> error;
|
|
LServer ->
|
|
case resourceprep(R) of
|
|
error -> error;
|
|
LResource ->
|
|
{LUser, LServer, LResource}
|
|
end
|
|
end
|
|
end.
|
|
|
|
jid_remove_resource(#jid{} = JID) ->
|
|
JID#jid{resource = "", lresource = ""};
|
|
jid_remove_resource({U, S, _R}) ->
|
|
{U, S, ""}.
|
|
|
|
jid_replace_resource(JID, Resource) ->
|
|
case resourceprep(Resource) of
|
|
error -> error;
|
|
LResource ->
|
|
JID#jid{resource = Resource, lresource = LResource}
|
|
end.
|
|
|
|
|
|
get_iq_namespace({xmlelement, Name, _Attrs, Els}) when Name == "iq" ->
|
|
case xml:remove_cdata(Els) of
|
|
[{xmlelement, _Name2, Attrs2, _Els2}] ->
|
|
xml:get_attr_s("xmlns", Attrs2);
|
|
_ ->
|
|
""
|
|
end;
|
|
get_iq_namespace(_) ->
|
|
"".
|
|
|
|
iq_query_info({xmlelement, Name, Attrs, Els}) when Name == "iq" ->
|
|
ID = xml:get_attr_s("id", Attrs),
|
|
Type = xml:get_attr_s("type", Attrs),
|
|
Lang = xml:get_attr_s("xml:lang", Attrs),
|
|
Type1 = case Type of
|
|
"set" -> set;
|
|
"get" -> get;
|
|
"result" -> reply;
|
|
"error" -> reply;
|
|
_ -> invalid
|
|
end,
|
|
if
|
|
(Type1 /= invalid) and (Type1 /= reply) ->
|
|
case xml:remove_cdata(Els) of
|
|
[{xmlelement, Name2, Attrs2, Els2}] ->
|
|
XMLNS = xml:get_attr_s("xmlns", Attrs2),
|
|
if
|
|
XMLNS /= "" ->
|
|
#iq{id = ID,
|
|
type = Type1,
|
|
xmlns = XMLNS,
|
|
lang = Lang,
|
|
sub_el = {xmlelement, Name2, Attrs2, Els2}};
|
|
true ->
|
|
invalid
|
|
end;
|
|
_ ->
|
|
invalid
|
|
end;
|
|
true ->
|
|
Type1
|
|
end;
|
|
iq_query_info(_) ->
|
|
not_iq.
|
|
|
|
is_iq_request_type(set) -> true;
|
|
is_iq_request_type(get) -> true;
|
|
is_iq_request_type(_) -> false.
|
|
|
|
iq_type_to_string(set) -> "set";
|
|
iq_type_to_string(get) -> "get";
|
|
iq_type_to_string(result) -> "result";
|
|
iq_type_to_string(error) -> "error";
|
|
iq_type_to_string(_) -> invalid.
|
|
|
|
|
|
iq_to_xml(#iq{id = ID, type = Type, sub_el = SubEl}) ->
|
|
if
|
|
ID /= "" ->
|
|
{xmlelement, "iq",
|
|
[{"id", ID}, {"type", iq_type_to_string(Type)}], SubEl};
|
|
true ->
|
|
{xmlelement, "iq",
|
|
[{"type", iq_type_to_string(Type)}], SubEl}
|
|
end.
|
|
|
|
|
|
parse_xdata_submit(El) ->
|
|
{xmlelement, _Name, Attrs, Els} = El,
|
|
case xml:get_attr_s("type", Attrs) of
|
|
"submit" ->
|
|
lists:reverse(parse_xdata_fields(Els, []));
|
|
_ ->
|
|
invalid
|
|
end.
|
|
|
|
parse_xdata_fields([], Res) ->
|
|
Res;
|
|
parse_xdata_fields([{xmlelement, Name, Attrs, SubEls} | Els], Res) ->
|
|
case Name of
|
|
"field" ->
|
|
case xml:get_attr_s("var", Attrs) of
|
|
"" ->
|
|
parse_xdata_fields(Els, Res);
|
|
Var ->
|
|
Field =
|
|
{Var, lists:reverse(parse_xdata_values(SubEls, []))},
|
|
parse_xdata_fields(Els, [Field | Res])
|
|
end;
|
|
_ ->
|
|
parse_xdata_fields(Els, Res)
|
|
end;
|
|
parse_xdata_fields([_ | Els], Res) ->
|
|
parse_xdata_fields(Els, Res).
|
|
|
|
parse_xdata_values([], Res) ->
|
|
Res;
|
|
parse_xdata_values([{xmlelement, Name, _Attrs, SubEls} | Els], Res) ->
|
|
case Name of
|
|
"value" ->
|
|
Val = xml:get_cdata(SubEls),
|
|
parse_xdata_values(Els, [Val | Res]);
|
|
_ ->
|
|
parse_xdata_values(Els, Res)
|
|
end;
|
|
parse_xdata_values([_ | Els], Res) ->
|
|
parse_xdata_values(Els, Res).
|
|
|
|
|
|
timestamp_to_iso({{Year, Month, Day}, {Hour, Minute, Second}}) ->
|
|
lists:flatten(
|
|
io_lib:format("~4..0w~2..0w~2..0wT~2..0w:~2..0w:~2..0w",
|
|
[Year, Month, Day, Hour, Minute, Second])).
|
|
|
|
timestamp_to_xml({{Year, Month, Day}, {Hour, Minute, Second}}) ->
|
|
{xmlelement, "x",
|
|
[{"xmlns", ?NS_DELAY},
|
|
{"stamp", lists:flatten(
|
|
io_lib:format("~4..0w~2..0w~2..0wT~2..0w:~2..0w:~2..0w",
|
|
[Year, Month, Day, Hour, Minute, Second]))}],
|
|
[]}.
|
|
|
|
now_to_utc_string({MegaSecs, Secs, MicroSecs}) ->
|
|
{{Year, Month, Day}, {Hour, Minute, Second}} =
|
|
calendar:now_to_universal_time({MegaSecs, Secs, MicroSecs}),
|
|
lists:flatten(
|
|
io_lib:format("~4..0w-~2..0w-~2..0wT~2..0w:~2..0w:~2..0w.~6..0wZ",
|
|
[Year, Month, Day, Hour, Minute, Second, MicroSecs])).
|
|
|
|
now_to_local_string({MegaSecs, Secs, MicroSecs}) ->
|
|
LocalTime = calendar:now_to_local_time({MegaSecs, Secs, MicroSecs}),
|
|
UTCTime = calendar:now_to_universal_time({MegaSecs, Secs, MicroSecs}),
|
|
Seconds = calendar:datetime_to_gregorian_seconds(LocalTime) -
|
|
calendar:datetime_to_gregorian_seconds(UTCTime),
|
|
{{H, M, _}, Sign} = if
|
|
Seconds < 0 ->
|
|
{calendar:seconds_to_time(-Seconds), "-"};
|
|
true ->
|
|
{calendar:seconds_to_time(Seconds), "+"}
|
|
end,
|
|
{{Year, Month, Day}, {Hour, Minute, Second}} = LocalTime,
|
|
lists:flatten(
|
|
io_lib:format("~4..0w-~2..0w-~2..0wT~2..0w:~2..0w:~2..0w.~6..0w~s~2..0w:~2..0w",
|
|
[Year, Month, Day, Hour, Minute, Second, MicroSecs, Sign, H, M])).
|
|
|
|
|
|
% yyyy-mm-ddThh:mm:ss[.sss]{Z|{+|-}hh:mm} -> {MegaSecs, Secs, MicroSecs}
|
|
datetime_string_to_timestamp(TimeStr) ->
|
|
case catch parse_datetime(TimeStr) of
|
|
{'EXIT', _Err} ->
|
|
undefined;
|
|
TimeStamp ->
|
|
TimeStamp
|
|
end.
|
|
|
|
parse_datetime(TimeStr) ->
|
|
[Date, Time] = string:tokens(TimeStr, "T"),
|
|
D = parse_date(Date),
|
|
{T, MS, TZH, TZM} = parse_time(Time),
|
|
S = calendar:datetime_to_gregorian_seconds({D, T}),
|
|
S1 = calendar:datetime_to_gregorian_seconds({{1970, 1, 1}, {0, 0, 0}}),
|
|
Seconds = (S - S1) - TZH * 60 * 60 - TZM * 60,
|
|
{Seconds div 1000000, Seconds rem 1000000, MS}.
|
|
|
|
% yyyy-mm-dd
|
|
parse_date(Date) ->
|
|
[Y, M, D] = string:tokens(Date, "-"),
|
|
Date1 = {list_to_integer(Y), list_to_integer(M), list_to_integer(D)},
|
|
case calendar:valid_date(Date1) of
|
|
true ->
|
|
Date1;
|
|
_ ->
|
|
false
|
|
end.
|
|
|
|
% hh:mm:ss[.sss]TZD
|
|
parse_time(Time) ->
|
|
case string:str(Time, "Z") of
|
|
0 ->
|
|
parse_time_with_timezone(Time);
|
|
_ ->
|
|
[T | _] = string:tokens(Time, "Z"),
|
|
{TT, MS} = parse_time1(T),
|
|
{TT, MS, 0, 0}
|
|
end.
|
|
|
|
parse_time_with_timezone(Time) ->
|
|
case string:str(Time, "+") of
|
|
0 ->
|
|
case string:str(Time, "-") of
|
|
0 ->
|
|
false;
|
|
_ ->
|
|
parse_time_with_timezone(Time, "-")
|
|
end;
|
|
_ ->
|
|
parse_time_with_timezone(Time, "+")
|
|
end.
|
|
|
|
parse_time_with_timezone(Time, Delim) ->
|
|
[T, TZ] = string:tokens(Time, Delim),
|
|
{TZH, TZM} = parse_timezone(TZ),
|
|
{TT, MS} = parse_time1(T),
|
|
case Delim of
|
|
"-" ->
|
|
{TT, MS, -TZH, -TZM};
|
|
"+" ->
|
|
{TT, MS, TZH, TZM}
|
|
end.
|
|
|
|
parse_timezone(TZ) ->
|
|
[H, M] = string:tokens(TZ, ":"),
|
|
{[H1, M1], true} = check_list([{H, 12}, {M, 60}]),
|
|
{H1, M1}.
|
|
|
|
parse_time1(Time) ->
|
|
[HMS | T] = string:tokens(Time, "."),
|
|
MS = case T of
|
|
[] ->
|
|
0;
|
|
[Val] ->
|
|
list_to_integer(string:left(Val, 6, $0))
|
|
end,
|
|
[H, M, S] = string:tokens(HMS, ":"),
|
|
{[H1, M1, S1], true} = check_list([{H, 24}, {M, 60}, {S, 60}]),
|
|
{{H1, M1, S1}, MS}.
|
|
|
|
check_list(List) ->
|
|
lists:mapfoldl(
|
|
fun({L, N}, B)->
|
|
V = list_to_integer(L),
|
|
if
|
|
(V >= 0) and (V =< N) ->
|
|
{V, B};
|
|
true ->
|
|
{false, false}
|
|
end
|
|
end, true, List).
|
|
|
|
|
|
%
|
|
% Base64 stuff (based on httpd_util.erl)
|
|
%
|
|
|
|
decode_base64(S) ->
|
|
decode1_base64([C || C <- S,
|
|
C /= $ ,
|
|
C /= $\t,
|
|
C /= $\n,
|
|
C /= $\r]).
|
|
|
|
decode1_base64([]) ->
|
|
[];
|
|
decode1_base64([Sextet1,Sextet2,$=,$=|Rest]) ->
|
|
Bits2x6=
|
|
(d(Sextet1) bsl 18) bor
|
|
(d(Sextet2) bsl 12),
|
|
Octet1=Bits2x6 bsr 16,
|
|
[Octet1|decode_base64(Rest)];
|
|
decode1_base64([Sextet1,Sextet2,Sextet3,$=|Rest]) ->
|
|
Bits3x6=
|
|
(d(Sextet1) bsl 18) bor
|
|
(d(Sextet2) bsl 12) bor
|
|
(d(Sextet3) bsl 6),
|
|
Octet1=Bits3x6 bsr 16,
|
|
Octet2=(Bits3x6 bsr 8) band 16#ff,
|
|
[Octet1,Octet2|decode_base64(Rest)];
|
|
decode1_base64([Sextet1,Sextet2,Sextet3,Sextet4|Rest]) ->
|
|
Bits4x6=
|
|
(d(Sextet1) bsl 18) bor
|
|
(d(Sextet2) bsl 12) bor
|
|
(d(Sextet3) bsl 6) bor
|
|
d(Sextet4),
|
|
Octet1=Bits4x6 bsr 16,
|
|
Octet2=(Bits4x6 bsr 8) band 16#ff,
|
|
Octet3=Bits4x6 band 16#ff,
|
|
[Octet1,Octet2,Octet3|decode_base64(Rest)];
|
|
decode1_base64(_CatchAll) ->
|
|
"".
|
|
|
|
d(X) when X >= $A, X =<$Z ->
|
|
X-65;
|
|
d(X) when X >= $a, X =<$z ->
|
|
X-71;
|
|
d(X) when X >= $0, X =<$9 ->
|
|
X+4;
|
|
d($+) -> 62;
|
|
d($/) -> 63;
|
|
d(_) -> 63.
|
|
|
|
|
|
encode_base64([]) ->
|
|
[];
|
|
encode_base64([A]) ->
|
|
[e(A bsr 2), e((A band 3) bsl 4), $=, $=];
|
|
encode_base64([A,B]) ->
|
|
[e(A bsr 2), e(((A band 3) bsl 4) bor (B bsr 4)), e((B band 15) bsl 2), $=];
|
|
encode_base64([A,B,C|Ls]) ->
|
|
encode_base64_do(A,B,C, Ls).
|
|
encode_base64_do(A,B,C, Rest) ->
|
|
BB = (A bsl 16) bor (B bsl 8) bor C,
|
|
[e(BB bsr 18), e((BB bsr 12) band 63),
|
|
e((BB bsr 6) band 63), e(BB band 63)|encode_base64(Rest)].
|
|
|
|
e(X) when X >= 0, X < 26 -> X+65;
|
|
e(X) when X>25, X<52 -> X+71;
|
|
e(X) when X>51, X<62 -> X-4;
|
|
e(62) -> $+;
|
|
e(63) -> $/;
|
|
e(X) -> exit({bad_encode_base64_token, X}).
|