UCS2StreamEncoder.cc

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/*
 * UCS2StreamEncoder.h
 *
 * Smalltalk like class library for C++
 * UCS-2 encoding translator.
 *
 * Copyright (c) 2006 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "stlib/UCS2StreamEncoder.h"

#include "stlib/Character.h"
#include "stlib/Integer.h"
#include "stlib/Stream.h"

namespace Core {

UCS2StreamEncoder::UCS2StreamEncoder(void)
{
    big_endian = false;
}

/* Class-accessing protocol */
String *UCS2StreamEncoder::className(void) const
{
    return new String("UCS2StreamEncoder");
}

/* Initialize protocol */
void UCS2StreamEncoder::bigEndian(void)
{
    big_endian = true;
}

void UCS2StreamEncoder::littleEndian(void)
{
    big_endian = false;
}

/* Accessing protocol */
Character *UCS2StreamEncoder::decodeFrom(Stream *stream)
{
    Integer *firstByte, *secondByte;
    unsigned short value;
    firstByte = dynamic_cast<Integer *>(stream->next());
    secondByte = dynamic_cast<Integer *>(stream->next());

    if (secondByte == nil) return nil; // stream end reached

    if (big_endian)
        value = firstByte->asLong() << 8 + secondByte->asLong();
    else
        value = secondByte->asLong() << 8 + firstByte->asLong();
    return Character::value(value);
}

void UCS2StreamEncoder::encodeTo(Stream *stream, Character *character)
{
    if (character->byteSize() > 2)
        error(new String("No character available"),
              new String(__PRETTY_FUNCTION__), character);

    long value = character->asInteger();
    unsigned char first, second;
    first = (value >> 8) & 0xff;
    second = value & 0xff;
    if (big_endian) {
        stream->nextPut(Integer::value(first));
        stream->nextPut(Integer::value(second));
    } else {
        stream->nextPut(Integer::value(second));
        stream->nextPut(Integer::value(first));
    }
}

}; /* namespace Core */

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