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-rw-r--r--lib/stdlib/src/base64.erl198
1 files changed, 123 insertions, 75 deletions
diff --git a/lib/stdlib/src/base64.erl b/lib/stdlib/src/base64.erl
index 7bf281bd8a..c8cf6fdffe 100644
--- a/lib/stdlib/src/base64.erl
+++ b/lib/stdlib/src/base64.erl
@@ -1,18 +1,19 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2007-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2007-2017. 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.
+%% 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%
%%
@@ -112,9 +113,9 @@ encode_binary(Bin) ->
Data :: ascii_binary().
decode(Bin) when is_binary(Bin) ->
- decode_binary(<<>>, Bin);
+ decode_binary(Bin, <<>>);
decode(List) when is_list(List) ->
- list_to_binary(decode_l(List)).
+ decode_list(List, <<>>).
-spec mime_decode(Base64) -> Data when
Base64 :: ascii_string() | ascii_binary(),
@@ -185,31 +186,41 @@ mime_decode_to_string(List) when is_list(List) ->
bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,
bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad,bad}).
-decode_binary(Result0, <<C:8,T0/bits>>) ->
- case element(C, ?DECODE_MAP) of
- bad ->
- erlang:error({badarg,C});
- ws ->
- decode_binary(Result0, T0);
- eq ->
- case strip_ws(T0) of
- <<$=:8,T/binary>> ->
- <<>> = strip_ws(T),
- Split = byte_size(Result0) - 1,
- <<Result:Split/bytes,_:4>> = Result0,
- Result;
- T ->
- <<>> = strip_ws(T),
- Split = byte_size(Result0) - 1,
- <<Result:Split/bytes,_:2>> = Result0,
- Result
- end;
- Bits ->
- decode_binary(<<Result0/bits,Bits:6>>, T0)
+decode_binary(<<C1:8, Cs/bits>>, A) ->
+ case element(C1, ?DECODE_MAP) of
+ ws -> decode_binary(Cs, A);
+ B1 -> decode_binary(Cs, A, B1)
end;
-decode_binary(Result, <<>>) ->
- true = is_binary(Result),
- Result.
+decode_binary(<<>>, A) ->
+ A.
+
+decode_binary(<<C2:8, Cs/bits>>, A, B1) ->
+ case element(C2, ?DECODE_MAP) of
+ ws -> decode_binary(Cs, A, B1);
+ B2 -> decode_binary(Cs, A, B1, B2)
+ end.
+
+decode_binary(<<C3:8, Cs/bits>>, A, B1, B2) ->
+ case element(C3, ?DECODE_MAP) of
+ ws -> decode_binary(Cs, A, B1, B2);
+ B3 -> decode_binary(Cs, A, B1, B2, B3)
+ end.
+
+decode_binary(<<C4:8, Cs/bits>>, A, B1, B2, B3) ->
+ case element(C4, ?DECODE_MAP) of
+ ws -> decode_binary(Cs, A, B1, B2, B3);
+ eq when B3 =:= eq -> only_ws_binary(Cs, <<A/binary,B1:6,(B2 bsr 4):2>>);
+ eq -> only_ws_binary(Cs, <<A/binary,B1:6,B2:6,(B3 bsr 2):4>>);
+ B4 -> decode_binary(Cs, <<A/binary,B1:6,B2:6,B3:6,B4:6>>)
+ end.
+
+only_ws_binary(<<>>, A) ->
+ A;
+only_ws_binary(<<C:8, Cs/bits>>, A) ->
+ case element(C, ?DECODE_MAP) of
+ ws -> only_ws_binary(Cs, A);
+ _ -> erlang:error(function_clause)
+ end.
%% Skipping pad character if not at end of string. Also liberal about
%% excess padding and skipping of other illegal (non-base64 alphabet)
@@ -218,38 +229,85 @@ mime_decode_binary(Result, <<0:8,T/bits>>) ->
mime_decode_binary(Result, T);
mime_decode_binary(Result0, <<C:8,T/bits>>) ->
case element(C, ?DECODE_MAP) of
- Bits when is_integer(Bits) ->
- mime_decode_binary(<<Result0/bits,Bits:6>>, T);
- eq ->
- case tail_contains_more(T, false) of
- {<<>>, Eq} ->
- %% No more valid data.
- case bit_size(Result0) rem 8 of
- 0 ->
- %% '====' is not uncommon.
- Result0;
- 4 when Eq ->
- %% enforce at least one more '=' only ignoring illegals and spacing
- Split = byte_size(Result0) - 1,
- <<Result:Split/bytes,_:4>> = Result0,
- Result;
- 2 ->
- %% remove 2 bits
- Split = byte_size(Result0) - 1,
- <<Result:Split/bytes,_:2>> = Result0,
- Result
- end;
- {More, _} ->
- %% More valid data, skip the eq as invalid
- mime_decode_binary(Result0, More)
- end;
- _ ->
- mime_decode_binary(Result0, T)
+ Bits when is_integer(Bits) ->
+ mime_decode_binary(<<Result0/bits,Bits:6>>, T);
+ eq ->
+ mime_decode_binary_after_eq(Result0, T, false);
+ _ ->
+ mime_decode_binary(Result0, T)
end;
-mime_decode_binary(Result, <<>>) ->
+mime_decode_binary(Result, _) ->
true = is_binary(Result),
Result.
+mime_decode_binary_after_eq(Result, <<0:8,T/bits>>, Eq) ->
+ mime_decode_binary_after_eq(Result, T, Eq);
+mime_decode_binary_after_eq(Result0, <<C:8,T/bits>>, Eq) ->
+ case element(C, ?DECODE_MAP) of
+ bad ->
+ mime_decode_binary_after_eq(Result0, T, Eq);
+ ws ->
+ mime_decode_binary_after_eq(Result0, T, Eq);
+ eq ->
+ mime_decode_binary_after_eq(Result0, T, true);
+ Bits when is_integer(Bits) ->
+ %% More valid data, skip the eq as invalid
+ mime_decode_binary(<<Result0/bits,Bits:6>>, T)
+ end;
+mime_decode_binary_after_eq(Result0, <<>>, Eq) ->
+ %% No more valid data.
+ case bit_size(Result0) rem 8 of
+ 0 ->
+ %% '====' is not uncommon.
+ Result0;
+ 4 when Eq ->
+ %% enforce at least one more '=' only ignoring illegals and spacing
+ Split = byte_size(Result0) - 1,
+ <<Result:Split/bytes,_:4>> = Result0,
+ Result;
+ 2 ->
+ %% remove 2 bits
+ Split = byte_size(Result0) - 1,
+ <<Result:Split/bytes,_:2>> = Result0,
+ Result
+ end.
+
+decode_list([C1 | Cs], A) ->
+ case element(C1, ?DECODE_MAP) of
+ ws -> decode_list(Cs, A);
+ B1 -> decode_list(Cs, A, B1)
+ end;
+decode_list([], A) ->
+ A.
+
+decode_list([C2 | Cs], A, B1) ->
+ case element(C2, ?DECODE_MAP) of
+ ws -> decode_list(Cs, A, B1);
+ B2 -> decode_list(Cs, A, B1, B2)
+ end.
+
+decode_list([C3 | Cs], A, B1, B2) ->
+ case element(C3, ?DECODE_MAP) of
+ ws -> decode_list(Cs, A, B1, B2);
+ B3 -> decode_list(Cs, A, B1, B2, B3)
+ end.
+
+decode_list([C4 | Cs], A, B1, B2, B3) ->
+ case element(C4, ?DECODE_MAP) of
+ ws -> decode_list(Cs, A, B1, B2, B3);
+ eq when B3 =:= eq -> only_ws(Cs, <<A/binary,B1:6,(B2 bsr 4):2>>);
+ eq -> only_ws(Cs, <<A/binary,B1:6,B2:6,(B3 bsr 2):4>>);
+ B4 -> decode_list(Cs, <<A/binary,B1:6,B2:6,B3:6,B4:6>>)
+ end.
+
+only_ws([], A) ->
+ A;
+only_ws([C | Cs], A) ->
+ case element(C, ?DECODE_MAP) of
+ ws -> only_ws(Cs, A);
+ _ -> erlang:error(function_clause)
+ end.
+
decode([], A) -> A;
decode([$=,$=,C2,C1|Cs], A) ->
Bits2x6 = (b64d(C1) bsl 18) bor (b64d(C2) bsl 12),
@@ -280,16 +338,6 @@ strip_spaces([$\r|Cs], A) -> strip_spaces(Cs, A);
strip_spaces([$\n|Cs], A) -> strip_spaces(Cs, A);
strip_spaces([C|Cs], A) -> strip_spaces(Cs, [C | A]).
-strip_ws(<<$\t,T/binary>>) ->
- strip_ws(T);
-strip_ws(<<$\n,T/binary>>) ->
- strip_ws(T);
-strip_ws(<<$\r,T/binary>>) ->
- strip_ws(T);
-strip_ws(<<$\s,T/binary>>) ->
- strip_ws(T);
-strip_ws(T) -> T.
-
%% Skipping pad character if not at end of string. Also liberal about
%% excess padding and skipping of other illegal (non-base64 alphabet)
%% characters. See section 3.3 of RFC4648
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-29 20:59:02 +0000