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Base32 Encoder/Decoder
Base 32 Encoder/Decoder
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aleks-f
181
Foundation/src/Base32Decoder.cpp
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181
Foundation/src/Base32Decoder.cpp
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//
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// Base32Decoder.cpp
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//
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// $Id: //poco/1.4/Foundation/src/Base32Decoder.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/Base32Decoder.h"
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#include "Poco/Base32Encoder.h"
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#include "Poco/Exception.h"
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#include "Poco/Mutex.h"
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namespace Poco {
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unsigned char Base32DecoderBuf::IN_ENCODING[256];
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bool Base32DecoderBuf::IN_ENCODING_INIT = false;
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namespace
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{
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static FastMutex mutex;
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}
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Base32DecoderBuf::Base32DecoderBuf(std::istream& istr):
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_groupLength(0),
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_groupIndex(0),
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_buf(*istr.rdbuf())
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{
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FastMutex::ScopedLock lock(mutex);
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if (!IN_ENCODING_INIT)
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{
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for (unsigned i = 0; i < sizeof(IN_ENCODING); i++)
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{
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IN_ENCODING[i] = 0xFF;
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}
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for (unsigned i = 0; i < sizeof(Base32EncoderBuf::OUT_ENCODING); i++)
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{
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IN_ENCODING[Base32EncoderBuf::OUT_ENCODING[i]] = i;
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}
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IN_ENCODING[static_cast<unsigned char>('=')] = '\0';
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IN_ENCODING_INIT = true;
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}
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}
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Base32DecoderBuf::~Base32DecoderBuf()
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{
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}
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int Base32DecoderBuf::readFromDevice()
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{
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if (_groupIndex < _groupLength)
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{
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return _group[_groupIndex++];
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}
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else
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{
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unsigned char buffer[8];
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memset(buffer, '=', sizeof(buffer));
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int c;
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// per RFC-4648, Section 6, permissible block lengths are:
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// 2, 4, 5, 7, and 8 bytes. Any other length is malformed.
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//
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do {
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if ((c = readOne()) == -1) return -1;
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buffer[0] = (unsigned char) c;
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if (IN_ENCODING[buffer[0]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) throw DataFormatException();
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buffer[1] = (unsigned char) c;
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if (IN_ENCODING[buffer[1]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) break;
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buffer[2] = (unsigned char) c;
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if (IN_ENCODING[buffer[2]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) throw DataFormatException();
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buffer[3] = (unsigned char) c;
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if (IN_ENCODING[buffer[3]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) break;
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buffer[4] = (unsigned char) c;
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if (IN_ENCODING[buffer[4]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) break;
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buffer[5] = (unsigned char) c;
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if (IN_ENCODING[buffer[5]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) throw DataFormatException();
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buffer[6] = (unsigned char) c;
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if (IN_ENCODING[buffer[6]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) break;
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buffer[7] = (unsigned char) c;
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if (IN_ENCODING[buffer[7]] == 0xFF) throw DataFormatException();
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} while (false);
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_group[0] = (IN_ENCODING[buffer[0]] << 3) | (IN_ENCODING[buffer[1]] >> 2);
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_group[1] = ((IN_ENCODING[buffer[1]] & 0x03) << 6) | (IN_ENCODING[buffer[2]] << 1) | (IN_ENCODING[buffer[3]] >> 4);
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_group[2] = ((IN_ENCODING[buffer[3]] & 0x0F) << 4) | (IN_ENCODING[buffer[4]] >> 1);
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_group[3] = ((IN_ENCODING[buffer[4]] & 0x01) << 7) | (IN_ENCODING[buffer[5]] << 2) | (IN_ENCODING[buffer[6]] >> 3);
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_group[4] = ((IN_ENCODING[buffer[6]] & 0x07) << 5) | IN_ENCODING[buffer[7]];
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if (buffer[2] == '=')
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_groupLength = 1;
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else if (buffer[4] == '=')
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_groupLength = 2;
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else if (buffer[5] == '=')
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_groupLength = 3;
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else if (buffer[7] == '=')
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_groupLength = 4;
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else
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_groupLength = 5;
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_groupIndex = 1;
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return _group[0];
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}
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}
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int Base32DecoderBuf::readOne()
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{
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int ch = _buf.sbumpc();
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return ch;
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}
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Base32DecoderIOS::Base32DecoderIOS(std::istream& istr): _buf(istr)
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{
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poco_ios_init(&_buf);
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}
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Base32DecoderIOS::~Base32DecoderIOS()
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{
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}
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Base32DecoderBuf* Base32DecoderIOS::rdbuf()
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{
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return &_buf;
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}
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Base32Decoder::Base32Decoder(std::istream& istr): Base32DecoderIOS(istr), std::istream(&_buf)
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{
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}
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Base32Decoder::~Base32Decoder()
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{
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}
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} // namespace Poco
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