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Diffstat (limited to 'src/couch_inets/http_base_64.erl')
| -rw-r--r-- | src/couch_inets/http_base_64.erl | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/src/couch_inets/http_base_64.erl b/src/couch_inets/http_base_64.erl deleted file mode 100644 index 00cd966b..00000000 --- a/src/couch_inets/http_base_64.erl +++ /dev/null @@ -1,126 +0,0 @@ -%% ``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 via the world wide web 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. -%% -%% The Initial Developer of the Original Code is Ericsson Utvecklings AB. -%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings -%% AB. All Rights Reserved.'' -%% -%% $Id$ -%% -%% Description: Implements base 64 encode and decode, see RFC2045. --module(http_base_64). - --export([encode/1, decode/1]). - --deprecated({'_', '_', next_major_release}). - -%%%========================================================================= -%%% API -%%%========================================================================= - -%%------------------------------------------------------------------------- -%% encode(ASCII) -> Base64 -%% ASCII - string() -%% Base64 - string() -%% -%% Description: Encodes a plain ASCII string into base64. -%%------------------------------------------------------------------------- -encode(ASCII) when is_list(ASCII) -> - encode_base64_list(ASCII). - - -%%------------------------------------------------------------------------- -%% decode(Base64) -> ASCII -%% Base64 - string() -%% ASCII - string() -%% -%% Description: Decodes an base64 encoded string to plain ASCII. -%%------------------------------------------------------------------------- -decode(Base64) when is_list(Base64) -> - decode_base64_list(sixtets(Base64), []). - -%%%======================================================================== -%%% Internal functions -%%%======================================================================== - -%% Base-64 encoding: take 6 bits at a time from the head of the binary -%% and emit it as 8 bit characters. -encode_base64_list([]) -> - []; -encode_base64_list([A]) -> - [int_to_b64(A bsr 2), int_to_b64((A band 3) bsl 4), $=, $=]; -encode_base64_list([A,B]) -> - [int_to_b64(A bsr 2), int_to_b64(((A band 3) bsl 4) bor (B bsr 4)), - int_to_b64((B band 15) bsl 2), $=]; -encode_base64_list([A,B,C|Ls]) -> - encode_base64_list_do(A,B,C, Ls). - -encode_base64_list_do(A,B,C, Rest) -> - BB = (A bsl 16) bor (B bsl 8) bor C, - [int_to_b64(BB bsr 18), int_to_b64((BB bsr 12) band 63), - int_to_b64((BB bsr 6) band 63), int_to_b64(BB band 63) | - encode_base64_list(Rest)]. - -int_to_b64(X) when X >= 0, X =< 25 -> X + $A; -int_to_b64(X) when X >= 26, X =< 51 -> X - 26 + $a; -int_to_b64(X) when X >= 52, X =< 61 -> X - 52 + $0; -int_to_b64(62) -> $+; -int_to_b64(63) -> $/. - -%% This version works by consuming groups of 4 input characters to create -%% a group of 3 output characters, with the three special-cases for -%% end-of-input first: - -decode_base64_list({[],[]}, Acc) -> - lists:reverse(Acc); -decode_base64_list({[Sixtet1,Sixtet2,pad,pad], []}, Acc) -> - Bits2x6 = (Sixtet1 bsl 18) bor (Sixtet2 bsl 12), - Octet1 = Bits2x6 bsr 16, - lists:reverse([Octet1 | Acc]); -decode_base64_list({[Sixtet1,Sixtet2,Sixtet3,pad], []}, Acc) -> - Bits3x6 = (Sixtet1 bsl 18) bor (Sixtet2 bsl 12) bor (Sixtet3 bsl 6), - Octet1 = Bits3x6 bsr 16, - Octet2 = (Bits3x6 bsr 8) band 16#ff, - lists:reverse([Octet2, Octet1 | Acc]); -decode_base64_list({[Sixtet1,Sixtet2,Sixtet3,Sixtet4],Rest}, Acc) when - Sixtet1 =/= pad, - Sixtet2 =/= pad, - Sixtet3 =/= pad, - Sixtet4 =/= pad -> - Bits4x6 = - (Sixtet1 bsl 18) bor (Sixtet2 bsl 12) bor (Sixtet3 bsl 6) bor Sixtet4, - Octet1 = Bits4x6 bsr 16, - Octet2 = (Bits4x6 bsr 8) band 16#ff, - Octet3 = Bits4x6 band 16#ff, - decode_base64_list(sixtets(Rest), [Octet3, Octet2, Octet1 | Acc]). - -b64_to_int(X) when X >= $A, X =< $Z -> X - $A; -b64_to_int(X) when X >= $a, X =< $z -> X - $a + 26; -b64_to_int(X) when X >= $0, X =< $9 -> X - $0 + 52; -b64_to_int($+) -> 62; -b64_to_int($/) -> 63; -b64_to_int($=) -> pad; % Padding will be removed by decode_base64_list/2 -b64_to_int(_) -> ignore. % Not in base 64 should be ignored - -sixtets(Str) -> - sixtets(Str, []). - -sixtets([], Sixtets) -> - {lists:reverse(Sixtets), []}; -sixtets(Rest, Sixtets) when length(Sixtets) == 4 -> - {lists:reverse(Sixtets), Rest}; -sixtets([Base64 | Tail], Sixtets) when length(Sixtets) < 4 -> - case b64_to_int(Base64) of - ignore -> - sixtets(Tail, Sixtets); - Int -> - sixtets(Tail, [Int | Sixtets]) - end. |