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package com.xagasoft.gats;
import java.io.InputStream;
import java.io.DataInputStream;
import java.io.OutputStream;
import java.io.ByteArrayOutputStream;
import java.lang.Math;
/**
* Represents a simple java double value. This does not represent an arbitrary
* precision floating point number, a class to handle that is forthcoming.
*/
public class GatsFloat extends GatsObject
{
double dValue = 0.0;
public GatsFloat()
{
}
public GatsFloat( double dValue )
{
this.dValue = dValue;
}
public double getValue()
{
return dValue;
}
public void setValue( double dValue )
{
this.dValue = dValue;
}
public String toString()
{
return "" + dValue;
}
public int getType()
{
return GatsObject.FLOAT;
}
void read( InputStream is, char cType ) throws java.io.IOException
{
if( cType == 'F' )
{
char cSubType = (char)is.read();
switch( cSubType )
{
case 'N': dValue = -Double.NaN; break;
case 'n': dValue = Double.NaN; break;
case 'I': dValue = Double.NEGATIVE_INFINITY; break;
case 'i': dValue = Double.POSITIVE_INFINITY; break;
case 'Z': dValue = -0.0; break;
case 'z': dValue = 0.0; break;
}
}
else if( cType == 'f' )
{
int iStr = (int)GatsInteger.readPackedInt( is );
boolean bNeg = false;
if( iStr < 0 )
{
bNeg = true;
iStr = -iStr;
}
int aBuf[] = new int[iStr];
DataInputStream dis = new DataInputStream( is );
for( int j = 0; j < iStr; j++ )
{
aBuf[j] = dis.readUnsignedByte();
}
dValue = 0.0;
for( int j = iStr-1; j > 0; j-- )
{
dValue = (dValue+(double)aBuf[j])*0x1p-8;
}
dValue += aBuf[0];
long iScale = GatsInteger.readPackedInt( is );
dValue *= Math.pow( 256.0, iScale );
if( bNeg )
dValue = -dValue;
}
}
void write( OutputStream os ) throws java.io.IOException
{
if( dValue == 0.0 )
{
os.write( (int)'F' );
os.write( (int)'z' );
}
else if( Double.isInfinite( dValue ) )
{
os.write( (int)'F' );
if( dValue < 0 )
os.write( (int)'I' );
else
os.write( (int)'i' );
}
else if( Double.isNaN( dValue ) )
{
os.write( (int)'F' );
os.write( (int)'n' );
}
else
{
os.write( (int)'f' );
double d = dValue;
boolean bNeg = false;
if( d < 0.0 )
{
bNeg = true;
d = -d;
}
ByteArrayOutputStream oTmp = new ByteArrayOutputStream();
long iScale = (long)(Math.log( d ) / 0x1.62e42fefa39efp+2);
if( iScale < 0 ) iScale--;
d /= Math.pow( 256.0, iScale );
oTmp.write( (int)d );
d -= (int)d;
for( int j = 0; j < 150 && d != 0.0; j++ )
{
d = d*256.0;
oTmp.write( (int)d );
d -= (int)d;
}
if( bNeg )
GatsInteger.writePackedInt( os, -oTmp.size() );
else
GatsInteger.writePackedInt( os, oTmp.size() );
os.write( oTmp.toByteArray() );
GatsInteger.writePackedInt( os, iScale );
}
}
};
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