mirror of
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154 lines
3.9 KiB
C++
154 lines
3.9 KiB
C++
//
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// Base64Decoder.cpp
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//
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// $Id: //poco/Main/Foundation/src/Base64Decoder.cpp#15 $
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//
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// Library: Foundation
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// Package: Streams
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// Module: Base64
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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/Base64Decoder.h"
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#include "Poco/Base64Encoder.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 Base64DecoderBuf::IN_ENCODING[256];
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bool Base64DecoderBuf::IN_ENCODING_INIT = false;
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Base64DecoderBuf::Base64DecoderBuf(std::istream& istr):
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_groupLength(0),
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_groupIndex(0),
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_istr(istr)
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{
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static FastMutex mutex;
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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(Base64EncoderBuf::OUT_ENCODING); i++)
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{
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IN_ENCODING[Base64EncoderBuf::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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Base64DecoderBuf::~Base64DecoderBuf()
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{
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}
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int Base64DecoderBuf::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[4];
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int c;
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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) return -1;
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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) return -1;
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buffer[2] = c;
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if (IN_ENCODING[buffer[2]] == 0xFF) throw DataFormatException();
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if ((c = readOne()) == -1) return -1;
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buffer[3] = c;
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if (IN_ENCODING[buffer[3]] == 0xFF) throw DataFormatException();
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_group[0] = (IN_ENCODING[buffer[0]] << 2) | (IN_ENCODING[buffer[1]] >> 4);
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_group[1] = ((IN_ENCODING[buffer[1]] & 0x0F) << 4) | (IN_ENCODING[buffer[2]] >> 2);
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_group[2] = (IN_ENCODING[buffer[2]] << 6) | IN_ENCODING[buffer[3]];
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if (buffer[2] == '=')
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_groupLength = 1;
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else if (buffer[3] == '=')
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_groupLength = 2;
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else
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_groupLength = 3;
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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 Base64DecoderBuf::readOne()
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{
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int ch = _istr.get();
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while (ch == ' ' || ch == '\r' || ch == '\t' || ch == '\n')
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ch = _istr.get();
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return ch;
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}
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Base64DecoderIOS::Base64DecoderIOS(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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Base64DecoderIOS::~Base64DecoderIOS()
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{
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}
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Base64DecoderBuf* Base64DecoderIOS::rdbuf()
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{
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return &_buf;
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}
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Base64Decoder::Base64Decoder(std::istream& istr): Base64DecoderIOS(istr), std::istream(&_buf)
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{
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}
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Base64Decoder::~Base64Decoder()
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{
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}
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} // namespace Poco
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