167 lines
4.2 KiB
C++
167 lines
4.2 KiB
C++
/*
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* This file is a part of Tito - a cryptography library
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2012-2022, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef headerfile_tito_base64
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#define headerfile_tito_base64
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#include <string>
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namespace Tito
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{
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class Base64
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{
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public:
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Base64();
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/*
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* padding character
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* default '=';
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*/
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void SetPadding(char c);
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/*
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* if false then allow the strings passed to Decode(...) methods to now have the trailing padding characters ('=')
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* default: true
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*/
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void RequirePaddingOnDecodedStrings(bool require);
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void Encode(const char * in, size_t len, std::string & out);
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void Encode(const char * in, std::string & out);
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void Encode(const std::string & in, std::string & out);
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bool Decode(const char * in, size_t len, std::string & out);
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bool Decode(const char * in, std::string & out);
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bool Decode(const std::string & in, std::string & out);
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bool Decode(const wchar_t * in, size_t len, std::string & out);
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bool Decode(const wchar_t * in, std::string & out);
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bool Decode(const std::wstring & in, std::string & out);
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private:
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static const char * tabbase64;
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size_t tabbase64_len;
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char padding;
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unsigned int not_existing;
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bool require_padding_on_decoded_strings;
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void Convert3to4Pieces(const char * s, size_t len, unsigned int * tab4);
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void ConvertFrom4to3Pieces(const unsigned int * tab4, unsigned int * tab3);
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bool CharFromBase64(unsigned int from, unsigned int & to);
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void Save4PiecesToString(std::string & s, const unsigned int * tab4);
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template<typename CharType>
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bool Make4pieces(const CharType * s, size_t len, unsigned int * tab4);
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template<typename StringType>
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void Save3PiecesToString(const unsigned int * tab3, StringType & s);
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template<typename CharType, typename StringType>
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bool DecodeRaw(const CharType * in, size_t len, StringType & out);
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};
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template<typename CharType>
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bool Base64::Make4pieces(const CharType * s, size_t len, unsigned int * tab4)
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{
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for(size_t i=0 ; i<4 ; ++i)
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{
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if( i >= len || s[i] == padding )
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tab4[i] = not_existing;
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else
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if( !CharFromBase64(static_cast<unsigned int>(s[i]), tab4[i]) )
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return false;
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}
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return true;
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}
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template<typename StringType>
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void Base64::Save3PiecesToString(const unsigned int * tab3, StringType & s)
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{
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for(int i=0 ; i<3 ; ++i)
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{
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if( tab3[i] != not_existing )
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s += tab3[i];
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}
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}
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template<typename CharType, typename StringType>
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bool Base64::DecodeRaw(const CharType * in, size_t len, StringType & out)
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{
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unsigned int tab3[3];
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unsigned int tab4[4];
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out.clear();
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size_t new_size = len - len/3 + 3;
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out.reserve(new_size);
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if( require_padding_on_decoded_strings && len % 4 != 0 )
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return false;
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while( len > 0 )
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{
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if( !Make4pieces(in, len, tab4) )
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return false;
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ConvertFrom4to3Pieces(tab4, tab3);
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Save3PiecesToString(tab3, out);
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in += 4;
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len = (len >= 4) ? len - 4 : 0;
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}
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return true;
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}
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} // namespace Tito
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#endif
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