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Diffstat (limited to 'src/couch/src/couch_base32.erl')
| -rw-r--r-- | src/couch/src/couch_base32.erl | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/src/couch/src/couch_base32.erl b/src/couch/src/couch_base32.erl deleted file mode 100644 index 776fe773d..000000000 --- a/src/couch/src/couch_base32.erl +++ /dev/null @@ -1,156 +0,0 @@ -% 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. - --module(couch_base32). - --export([encode/1, decode/1]). - --define(SET, <<"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567">>). - --spec encode(binary()) -> binary(). -encode(Plain) when is_binary(Plain) -> - IoList = encode(Plain, 0, byte_size(Plain) * 8, []), - iolist_to_binary(lists:reverse(IoList)). - -encode(_Plain, _ByteOffset, 0, Acc) -> - Acc; -encode(Plain, ByteOffset, BitsRemaining, Acc) when BitsRemaining == 8 -> - <<A:5, B:3>> = binary:part(Plain, ByteOffset, 1), - [<<(binary:at(?SET, A)), (binary:at(?SET, B bsl 2)), "======">> | Acc]; -encode(Plain, ByteOffset, BitsRemaining, Acc) when BitsRemaining == 16 -> - <<A:5, B:5, C:5, D:1>> = binary:part(Plain, ByteOffset, 2), - [ - << - (binary:at(?SET, A)), - (binary:at(?SET, B)), - (binary:at(?SET, C)), - (binary:at(?SET, D bsl 4)), - "====" - >> - | Acc - ]; -encode(Plain, ByteOffset, BitsRemaining, Acc) when BitsRemaining == 24 -> - <<A:5, B:5, C:5, D:5, E:4>> = binary:part(Plain, ByteOffset, 3), - [ - << - (binary:at(?SET, A)), - (binary:at(?SET, B)), - (binary:at(?SET, C)), - (binary:at(?SET, D)), - (binary:at(?SET, E bsl 1)), - "===" - >> - | Acc - ]; -encode(Plain, ByteOffset, BitsRemaining, Acc) when BitsRemaining == 32 -> - <<A:5, B:5, C:5, D:5, E:5, F:5, G:2>> = binary:part(Plain, ByteOffset, 4), - [ - << - (binary:at(?SET, A)), - (binary:at(?SET, B)), - (binary:at(?SET, C)), - (binary:at(?SET, D)), - (binary:at(?SET, E)), - (binary:at(?SET, F)), - (binary:at(?SET, G bsl 3)), - "=" - >> - | Acc - ]; -encode(Plain, ByteOffset, BitsRemaining, Acc) when BitsRemaining >= 40 -> - <<A:5, B:5, C:5, D:5, E:5, F:5, G:5, H:5>> = - binary:part(Plain, ByteOffset, 5), - Output = << - (binary:at(?SET, A)), - (binary:at(?SET, B)), - (binary:at(?SET, C)), - (binary:at(?SET, D)), - (binary:at(?SET, E)), - (binary:at(?SET, F)), - (binary:at(?SET, G)), - (binary:at(?SET, H)) - >>, - encode(Plain, ByteOffset + 5, BitsRemaining - 40, [Output | Acc]). - --spec decode(binary()) -> binary(). -decode(Encoded) when is_binary(Encoded) -> - IoList = decode(Encoded, 0, []), - iolist_to_binary(lists:reverse(IoList)). - -decode(Encoded, ByteOffset, Acc) when ByteOffset == byte_size(Encoded) -> - Acc; -decode(Encoded, ByteOffset, Acc) -> - case binary:part(Encoded, ByteOffset, 8) of - <<A:1/binary, B:1/binary, "======">> -> - [<<(find_in_set(A)):5, (find_in_set(B) bsr 2):3>> | Acc]; - <<A:1/binary, B:1/binary, C:1/binary, D:1/binary, "====">> -> - [ - << - (find_in_set(A)):5, - (find_in_set(B)):5, - (find_in_set(C)):5, - (find_in_set(D) bsr 4):1 - >> - | Acc - ]; - <<A:1/binary, B:1/binary, C:1/binary, D:1/binary, E:1/binary, "===">> -> - [ - << - (find_in_set(A)):5, - (find_in_set(B)):5, - (find_in_set(C)):5, - (find_in_set(D)):5, - (find_in_set(E) bsr 1):4 - >> - | Acc - ]; - <<A:1/binary, B:1/binary, C:1/binary, D:1/binary, E:1/binary, F:1/binary, G:1/binary, "=">> -> - [ - << - (find_in_set(A)):5, - (find_in_set(B)):5, - (find_in_set(C)):5, - (find_in_set(D)):5, - (find_in_set(E)):5, - (find_in_set(F)):5, - (find_in_set(G) bsr 3):2 - >> - | Acc - ]; - <<A:1/binary, B:1/binary, C:1/binary, D:1/binary, E:1/binary, F:1/binary, G:1/binary, - H:1/binary>> -> - decode( - Encoded, - ByteOffset + 8, - [ - << - (find_in_set(A)):5, - (find_in_set(B)):5, - (find_in_set(C)):5, - (find_in_set(D)):5, - (find_in_set(E)):5, - (find_in_set(F)):5, - (find_in_set(G)):5, - (find_in_set(H)):5 - >> - | Acc - ] - ) - end. - -find_in_set(Char) -> - case binary:match(?SET, Char) of - nomatch -> - erlang:error(not_base32); - {Offset, _} -> - Offset - end. |