UnicodeConverter.cpp

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//
// UnicodeConverter.cpp
//
// $Id: //poco/1.3/Foundation/src/UnicodeConverter.cpp#2 $
//
// Library: Foundation
// Package: Text
// Module:  UnicodeConverter
//
// Copyright (c) 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.
//


#ifndef POCO_NO_WSTRING


#include "Poco/UnicodeConverter.h"
#include "Poco/TextConverter.h"
#include "Poco/TextIterator.h"
#include "Poco/UTF8Encoding.h"
#include "Poco/UTF16Encoding.h"
#include <cstring>
#include <wchar.h>


namespace Poco {


void UnicodeConverter::toUTF16(const std::string& utf8String, std::wstring& utf16String)
{
        utf16String.clear();
        UTF8Encoding utf8Encoding;
        TextIterator it(utf8String, utf8Encoding);
        TextIterator end(utf8String);
        while (it != end) utf16String += (wchar_t) *it++;
}


void UnicodeConverter::toUTF16(const char* utf8String, int length, std::wstring& utf16String)
{
        poco_check_ptr (utf8String);

        utf16String.clear();

        UTF8Encoding utf8Encoding;
        UTF16Encoding utf16Encoding;
        const unsigned char* it  = (const unsigned char*) utf8String;
        const unsigned char* end = (const unsigned char*) utf8String + length;
        
        while (it < end)
        {
                unsigned char c = *it;
                int n = utf8Encoding.characterMap()[c];
                int uc = '?';
                if (n == -1) 
                {
                        ++it;
                }
                else if (n >= 0)
                {
                        uc = n;
                        ++it;
                }
                else
                {
                        if (it - n <= end)
                        {
                                uc = utf8Encoding.convert(it);
                                if (uc == -1) uc = '?';
                        }
                        it -= n;
                }
                utf16String += (wchar_t) uc; // TODO: surrogates
        }
}


void UnicodeConverter::toUTF16(const char* utf8String, std::wstring& utf16String)
{
        toUTF16(utf8String, (int) std::strlen(utf8String), utf16String);
}


void UnicodeConverter::toUTF8(const std::wstring& utf16String, std::string& utf8String)
{
        utf8String.clear();
        UTF8Encoding utf8Encoding;
        UTF16Encoding utf16Encoding;
        TextConverter converter(utf16Encoding, utf8Encoding);
        converter.convert(utf16String.data(), (int) utf16String.length()*sizeof(wchar_t), utf8String);
}


void UnicodeConverter::toUTF8(const wchar_t* utf16String, int length, std::string& utf8String)
{
        utf8String.clear();
        UTF8Encoding utf8Encoding;
        UTF16Encoding utf16Encoding;
        TextConverter converter(utf16Encoding, utf8Encoding);
        converter.convert(utf16String, (int) length*sizeof(wchar_t), utf8String);
}


void UnicodeConverter::toUTF8(const wchar_t* utf16String, std::string& utf8String)
{
        toUTF8(utf16String, (int) wcslen(utf16String), utf8String);
}


} // namespace Poco


#endif // POCO_NO_WSTRING