jausUnsignedInteger.c

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// File Name: jausUnsignedInteger.c
//
// Written By: Danny Kent (jaus AT dannykent DOT com), Tom Galluzzo (galluzzo AT gmail DOT com)
//
// Version: 3.3.0a
//
// Date: 08/07/08
//
// Description: This file defines all the basic JausUnsignedInteger funtionality, this should be primarily used through the JausType file and its methods

#include <string.h>
#include <stdlib.h>
#include "jaus.h"

JausUnsignedInteger newJausUnsignedInteger(unsigned int val)
{
	return val;
}

JausBoolean jausUnsignedIntegerFromBuffer(JausUnsignedInteger *jUint, unsigned char *buf, unsigned int bufferSizeBytes)
{
#ifdef JAUS_BIG_ENDIAN
	int i = 0;
#endif	
	unsigned int tempUInt = 0;
	
	if(bufferSizeBytes < JAUS_UNSIGNED_INTEGER_SIZE_BYTES)
		return JAUS_FALSE;
	else
	{
#ifdef JAUS_BIG_ENDIAN
		// swap bytes
		for(i = 0; i < JAUS_UNSIGNED_INTEGER_SIZE_BYTES; i++)
			tempUInt += (buf[i] << (JAUS_UNSIGNED_INTEGER_SIZE_BYTES-i-1)*8);
#else
		memcpy(&(tempUInt), buf, JAUS_UNSIGNED_INTEGER_SIZE_BYTES);
#endif	
		*jUint = newJausUnsignedInteger(tempUInt);
		return JAUS_TRUE;
	}
}

JausBoolean jausUnsignedIntegerToBuffer(JausUnsignedInteger input, unsigned char *buf, unsigned int bufferSizeBytes)
{
#ifdef JAUS_BIG_ENDIAN
	int i = 0;
#endif	

	if(bufferSizeBytes < JAUS_UNSIGNED_INTEGER_SIZE_BYTES)
		return JAUS_FALSE;
	else
	{
#ifdef JAUS_BIG_ENDIAN
		// swap bytes
		for (i = 0; i < JAUS_UNSIGNED_INTEGER_SIZE_BYTES; i++)
			buf[i] = ((input >> (JAUS_UNSIGNED_INTEGER_SIZE_BYTES-i-1)*8) & 0xFF); // 8 bits per byte
#else
		memcpy(buf, &input, JAUS_UNSIGNED_INTEGER_SIZE_BYTES);
#endif	
		return JAUS_TRUE;
	}
}

double jausUnsignedIntegerToDouble(JausUnsignedInteger input, double min, double max)
{
	// BUG: What to do when max < min
	double scaleFactor = (max-min)/JAUS_UNSIGNED_INTEGER_RANGE;
	double bias = min;

	return input*scaleFactor + bias;
}

JausUnsignedInteger jausUnsignedIntegerFromDouble(double value, double min, double max)
{
	//limit value between min and max UnsignedInteger values
	double scaleFactor = (max-min)/JAUS_UNSIGNED_INTEGER_RANGE;
	double bias = min;
	
	// limit real number between min and max
	if(value < min) value = min;
	if(value > max) value = max;
		
	// calculate rounded integer value
	return newJausUnsignedInteger((unsigned int)((value - bias)/scaleFactor + 0.5));
}

JausBoolean jausUnsignedIntegerIsBitSet(JausUnsignedInteger input, int bit)
{
	return (input & (0x01 << bit)) > 0 ? JAUS_TRUE : JAUS_FALSE;
}

JausBoolean jausUnsignedIntegerSetBit(JausUnsignedInteger *input, int bit)
{
	if(JAUS_UNSIGNED_INTEGER_SIZE_BYTES*8 < bit) // 8 bits per byte
	{
		return JAUS_FALSE;
	}
	else
	{
		*input |= 0x01 << bit;
		return JAUS_TRUE;
	}
}

JausBoolean jausUnsignedIntegerClearBit(JausUnsignedInteger *input, int bit)
{
	if(JAUS_UNSIGNED_INTEGER_SIZE_BYTES*8 < bit)
	{
		return JAUS_FALSE;
	}
	else
	{
		*input &= ~(0x01 << bit);
		return JAUS_TRUE;
	}
}