diff options
Diffstat (limited to 'lib/ssl/src/ssl_base64.erl')
-rw-r--r-- | lib/ssl/src/ssl_base64.erl | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/lib/ssl/src/ssl_base64.erl b/lib/ssl/src/ssl_base64.erl deleted file mode 100644 index cfc42407e8..0000000000 --- a/lib/ssl/src/ssl_base64.erl +++ /dev/null @@ -1,129 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 2003-2009. 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% -%% - -%% - -%%% Purpose : Base 64 encoding and decoding. - --module(ssl_base64). - --export([encode/1, encode_split/1, decode/1, join_decode/1]). - --define(st(X,A), ((X-A+256) div 256)). --define(CHARS, 64). - -%% A PEM encoding consists of characters A-Z, a-z, 0-9, +, / and -%% =. Each character encodes a 6 bits value from 0 to 63 (A = 0, / = -%% 63); = is a padding character. -%% - -%% -%% encode(Bytes|Binary) -> Chars -%% -%% Take 3 bytes a time (3 x 8 = 24 bits), and make 4 characters out of -%% them (4 x 6 = 24 bits). -%% -encode(Bs) when is_list(Bs) -> - encode(list_to_binary(Bs)); -encode(<<B:3/binary, Bs/binary>>) -> - <<C1:6, C2:6, C3:6, C4:6>> = B, - [enc(C1), enc(C2), enc(C3), enc(C4)| encode(Bs)]; -encode(<<B:2/binary>>) -> - <<C1:6, C2:6, C3:6, _:6>> = <<B/binary, 0>>, - [enc(C1), enc(C2), enc(C3), $=]; -encode(<<B:1/binary>>) -> - <<C1:6, C2:6, _:12>> = <<B/binary, 0, 0>>, - [enc(C1), enc(C2), $=, $=]; -encode(<<>>) -> - []. - -%% -%% encode_split(Bytes|Binary) -> Lines -%% -%% The encoding is divided into lines separated by <NL>, and each line -%% is precisely 64 characters long (excluding the <NL> characters, -%% except the last line which 64 characters long or shorter. <NL> may -%% follow the last line. -%% -encode_split(Bs) -> - split(encode(Bs)). - -%% -%% decode(Chars) -> Binary -%% -decode(Cs) -> - list_to_binary(decode1(Cs)). - -decode1([C1, C2, $=, $=]) -> - <<B1, _:16>> = <<(dec(C1)):6, (dec(C2)):6, 0:12>>, - [B1]; -decode1([C1, C2, C3, $=]) -> - <<B1, B2, _:8>> = <<(dec(C1)):6, (dec(C2)):6, (dec(C3)):6, (dec(0)):6>>, - [B1, B2]; -decode1([C1, C2, C3, C4| Cs]) -> - Bin = <<(dec(C1)):6, (dec(C2)):6, (dec(C3)):6, (dec(C4)):6>>, - [Bin| decode1(Cs)]; -decode1([]) -> - []. - -%% -%% join_decode(Lines) -> Binary -%% -%% Remove <NL> before decoding. -%% -join_decode(Cs) -> - decode(join(Cs)). - -%% -%% Locals -%% - -%% enc/1 and dec/1 -%% -%% Mapping: 0-25 -> A-Z, 26-51 -> a-z, 52-61 -> 0-9, 62 -> +, 63 -> / -%% -enc(C) -> - 65 + C + 6*?st(C,26) - 75*?st(C,52) -15*?st(C,62) + 3*?st(C,63). - -dec(C) -> - 62*?st(C,43) + ?st(C,47) + (C-59)*?st(C,48) - 69*?st(C,65) - 6*?st(C,97). - -%% split encoding into lines -%% -split(Cs) -> - split(Cs, ?CHARS). - -split([], _N) -> - [$\n]; -split(Cs, 0) -> - [$\n| split(Cs, ?CHARS)]; -split([C| Cs], N) -> - [C| split(Cs, N-1)]. - -%% join lines of encodings -%% -join([$\r, $\n| Cs]) -> - join(Cs); -join([$\n| Cs]) -> - join(Cs); -join([C| Cs]) -> - [C| join(Cs)]; -join([]) -> - []. - |