LittleEndianBuffer.cpp

/*
 * This file is part of ShapeFusion (Copyright 2000 Tito Dal Canton)
 *
 * ShapeFusion is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * ShapeFusion 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ShapeFusion; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#include <iostream>
#include "LittleEndianBuffer.h"

LittleEndianBuffer::LittleEndianBuffer(unsigned int _size):
		GenericEndianBuffer(_size)
{

}

LittleEndianBuffer::LittleEndianBuffer(unsigned char *_data, unsigned int _size):
		GenericEndianBuffer(_data, _size)
{
	
}

LittleEndianBuffer::~LittleEndianBuffer(void)
{

}

short LittleEndianBuffer::ReadShort(void)
{
	if ((unsigned int)(mPosition - mData + 1) < mSize) {
		unsigned char	lo = *mPosition++,
						hi = *mPosition++;

		return (short)((hi << 8) | lo);
	} else {
		std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
		return 0;
	}
}

unsigned short LittleEndianBuffer::ReadUShort(void)
{
	if ((unsigned int)(mPosition - mData + 1) < mSize) {
		unsigned char	lo = *mPosition++,
						hi = *mPosition++;
		
		return (unsigned short)((hi << 8) | lo);
	} else {
		std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
		return 0;
	}
}

long LittleEndianBuffer::ReadLong(void)
{
	if ((unsigned int)(mPosition - mData + 3) < mSize) {
		unsigned char   a = *mPosition++,
						b = *mPosition++,
						c = *mPosition++,
						d = *mPosition++;
		
		return (long)((d << 24) | (c << 16) | (b << 8) | a);
	} else {
		std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
		return 0;
	}
}

unsigned long LittleEndianBuffer::ReadULong(void)
{
	if ((unsigned int)(mPosition - mData + 3) < mSize) {
		unsigned char   a = *mPosition++,
						b = *mPosition++,
						c = *mPosition++,
						d = *mPosition++;
		
		return (unsigned long)((d << 24) | (c << 16) | (b << 8) | a);
	} else {
		std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
		return 0;
	}
}

void LittleEndianBuffer::WriteShort(short v)
{
	if ((unsigned int)(mPosition - mData + 1) < mSize) {
		*mPosition++ = v & 0xff;
		*mPosition++ = (v >> 8) & 0xff;
	} else {
		std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
	}
}

void LittleEndianBuffer::WriteUShort(unsigned short v)
{
	if ((unsigned int)(mPosition - mData + 1) < mSize) {
		*mPosition++ = v & 0xff;
		*mPosition++ = (v >> 8) & 0xff;
	} else {
		std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
	}
}

void LittleEndianBuffer::WriteLong(long v)
{
	if ((unsigned int)(mPosition - mData + 3) < mSize) {
		*mPosition++ = v & 0xff;
		*mPosition++ = (v >> 8) & 0xff;
		*mPosition++ = (v >> 16) & 0xff;
		*mPosition++ = (v >> 24) & 0xff;
	} else {
		std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
	}
}

void LittleEndianBuffer::WriteULong(unsigned long v)
{
	if ((unsigned int)(mPosition - mData + 3) < mSize) {
		*mPosition++ = v & 0xff;
		*mPosition++ = (v >> 8) & 0xff;
		*mPosition++ = (v >> 16) & 0xff;
		*mPosition++ = (v >> 24) & 0xff;
	} else {
		std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
	}
}