TextConverter.cpp

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//
// TextConverter.cpp
//
// $Id: //poco/1.3/Foundation/src/TextConverter.cpp#2 $
//
// Library: Foundation
// Package: Text
// Module:  TextConverter
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


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


namespace {
        int nullTransform(int ch)
        {
                return ch;
        }
}


namespace Poco {


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


int TextConverter::convert(const void* source, int length, std::string& destination, Transform trans)
{
        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;
                }
                uc = trans(uc);
                n = _outEncoding.convert(uc, buffer, sizeof(buffer));
                if (n == 0) n = _outEncoding.convert(_defaultChar, buffer, sizeof(buffer));
                poco_assert (n <= (int)sizeof(buffer));
                destination.append((const char*) buffer, n);
        }
        return errors;
}


int TextConverter::convert(const std::string& source, std::string& destination)
{
        return convert(source, destination, nullTransform);
}


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


} // namespace Poco