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Base32 Encoder/Decoder
Base 32 Encoder/Decoder
This commit is contained in:
aleks-f
223
Foundation/src/Base32Encoder.cpp
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223
Foundation/src/Base32Encoder.cpp
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//
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// Base32Encoder.cpp
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//
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// $Id: //poco/1.4/Foundation/src/Base32Encoder.cpp#2 $
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//
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// Library: Foundation
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// Package: Streams
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// Module: Base32
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/Base32Encoder.h"
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namespace Poco {
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const unsigned char Base32EncoderBuf::OUT_ENCODING[32] =
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{
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', '2', '3', '4', '5', '6', '8',
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};
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Base32EncoderBuf::Base32EncoderBuf(std::ostream& ostr):
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_groupLength(0),
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_buf(*ostr.rdbuf())
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{
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}
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Base32EncoderBuf::~Base32EncoderBuf()
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{
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try
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{
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close();
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}
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catch (...)
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{
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}
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}
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int Base32EncoderBuf::writeToDevice(char c)
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{
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static const int eof = std::char_traits<char>::eof();
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_group[_groupLength++] = (unsigned char) c;
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if (_groupLength == 5)
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{
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unsigned char idx;
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idx = _group[0] >> 3;
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[0] & 0x07) << 2) | (_group[1] >> 6);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x3E) >> 1);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x01) << 4) | (_group[2] >> 4);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[2] & 0x0F) << 1) | (_group[3] >> 7);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[3] & 0x7C) >> 2);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[3] & 0x03) << 3) | (_group[4] >> 5);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = (_group[4] & 0x1F);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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_groupLength = 0;
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}
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return charToInt(c);
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}
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int Base32EncoderBuf::close()
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{
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static const int eof = std::char_traits<char>::eof();
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if (sync() == eof) return eof;
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if (_groupLength == 1)
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{
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_group[1] = 0;
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unsigned char idx;
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idx = _group[0] >> 3;
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[0] & 0x07) << 2);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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#if 0
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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#endif
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}
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else if (_groupLength == 2)
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{
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_group[2] = 0;
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unsigned char idx;
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idx = _group[0] >> 3;
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[0] & 0x07) << 2) | (_group[1] >> 6);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x3E) >> 1);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x01) << 4);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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#if 0
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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#endif
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}
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else if (_groupLength == 3)
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{
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_group[3] = 0;
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unsigned char idx;
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idx = _group[0] >> 3;
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[0] & 0x07) << 2) | (_group[1] >> 6);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x3E) >> 1);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x01) << 4) | (_group[2] >> 4);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[2] & 0x0F) << 1);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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#if 0
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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if (_buf.sputc('=') == eof) return eof;
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#endif
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}
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else if (_groupLength == 4)
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{
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_group[4] = 0;
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unsigned char idx;
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idx = _group[0] >> 3;
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[0] & 0x07) << 2) | (_group[1] >> 6);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x3E) >> 1);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[1] & 0x01) << 4) | (_group[2] >> 4);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[2] & 0x0F) << 1) | (_group[3] >> 7);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[3] & 0x7C) >> 2);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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idx = ((_group[3] & 0x03) << 3);
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if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
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#if 0
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if (_buf.sputc('=') == eof) return eof;
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#endif
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}
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_groupLength = 0;
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return _buf.pubsync();
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}
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Base32EncoderIOS::Base32EncoderIOS(std::ostream& ostr): _buf(ostr)
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{
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poco_ios_init(&_buf);
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}
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Base32EncoderIOS::~Base32EncoderIOS()
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{
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}
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int Base32EncoderIOS::close()
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{
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return _buf.close();
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}
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Base32EncoderBuf* Base32EncoderIOS::rdbuf()
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{
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return &_buf;
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}
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Base32Encoder::Base32Encoder(std::ostream& ostr): Base32EncoderIOS(ostr), std::ostream(&_buf)
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{
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}
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Base32Encoder::~Base32Encoder()
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{
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}
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} // namespace Poco
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