mirror of
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d1a9ccdd19
git-svn-id: http://encfs.googlecode.com/svn/trunk@123 db9cf616-1c43-0410-9cb8-a902689de0d6
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2002-2003, Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _base64_incl_
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#define _base64_incl_
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#include "base/types.h"
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namespace encfs {
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inline int B64ToB256Bytes(int numB64Bytes) {
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return (numB64Bytes * 6) / 8; // round down
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}
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inline int B32ToB256Bytes(int numB32Bytes) {
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return (numB32Bytes * 5) / 8; // round down
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}
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inline int B256ToB64Bytes(int numB256Bytes) {
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return (numB256Bytes * 8 + 5) / 6; // round up
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}
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inline int B256ToB32Bytes(int numB256Bytes) {
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return (numB256Bytes * 8 + 4) / 5; // round up
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}
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/*
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convert data between different bases - each being a power of 2.
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*/
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void changeBase2(byte *src, int srcLength, int srcPow2, byte *dst,
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int dstLength, int dstPow2);
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/*
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same as changeBase2, but writes output over the top of input data.
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*/
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void changeBase2Inline(byte *buf, int srcLength, int srcPow2, int dst2Pow,
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bool outputPartialLastByte);
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// inplace translation from values [0,2^6] => base64 ASCII
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// This is a nonstandard B64 encoding, which uses ',' and '-' as
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// non-alphanumeric chars.
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void B64ToAscii(byte *buf, int length);
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// inplace translation from values [0,2^5] => base32 ASCII
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void B32ToAscii(byte *buf, int length);
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// inplace translation from values base64 ASCII => [0,2^6]
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// This is a nonstandard B64 encoding, which uses ',' and '-' as
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// non-alphanumeric chars.
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void AsciiToB64(byte *buf, int length);
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// inplace translation from values base32 ASCII => [0,2^5]
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void AsciiToB32(byte *buf, int length);
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// Decode standard B64 into the output array.
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// Used only to decode legacy Boost XML serialized config format.
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// The output size must be at least B64ToB256Bytes(inputLen).
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bool B64StandardDecode(byte *out, const byte *in, int inputLen);
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} // namespace encfs
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#endif
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