textconverter.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// TextConverter.cpp
//
// $Id: //poco/Main/Foundation/src/TextConverter.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "Foundation/TextConverter.h"
#include "Foundation/TextIterator.h"
#include "Foundation/TextEncoding.h"


Foundation_BEGIN


TextConverter::TextConverter(const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar):
	_inEncoding(inEncoding),
	_outEncoding(outEncoding),
	_defaultChar(defaultChar)
{
}


TextConverter::~TextConverter()
{
}


int TextConverter::convert(const std::string& source, std::string& destination)
{
	int errors = 0;
	TextIterator it(source, _inEncoding);
	TextIterator end(source);
	unsigned char buffer[TextEncoding::MAX_SEQUENCE_LENGTH];

	while (it != end)
	{
		int c = *it;
		if (c == -1) { ++errors; c = _defaultChar; }
		int n = _outEncoding.convert(c, buffer, sizeof(buffer));
		if (n == 0) n = _outEncoding.convert(_defaultChar, buffer, sizeof(buffer));
		poco_assert (n <= sizeof(buffer));
		destination.append((const char*) buffer, n);
		++it;
	}
	return errors;
}


int TextConverter::convert(const void* source, int length, std::string& destination)
{
	poco_check_ptr (source);

	int errors = 0;
	const unsigned char* it  = (const unsigned char*) source;
	const unsigned char* end = (const unsigned char*) source + length;
	unsigned char buffer[TextEncoding::MAX_SEQUENCE_LENGTH];
	
	while (it < end)
	{
		unsigned char c = *it;
		int n = _inEncoding.characterMap()[c];
		int uc;
		if (n == -1) 
		{
			++errors; 
			uc = _defaultChar; 
			++it;
		}
		else if (n >= 0)
		{
			uc = n;
			++it;
		}
		else
		{
			if (it - n <= end)
			{
				uc = _inEncoding.convert(it);
				if (uc == -1) uc = _defaultChar;
			}
			else 
			{ 
				++errors; 
				uc = _defaultChar; 
			}
			it -= n;
		}
		n = _outEncoding.convert(uc, buffer, sizeof(buffer));
		if (n == 0) n = _outEncoding.convert(_defaultChar, buffer, sizeof(buffer));
		poco_assert (n <= sizeof(buffer));
		destination.append((const char*) buffer, n);
	}
	return errors;
}


Foundation_END