From fa070d1f3a5853105d678324f2902457c917eab1 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Thu, 21 Apr 2011 20:40:06 +0000
Subject: Gats float should (maybe) work...

---
 java/com/xagasoft/gats/GatsFloat.java  | 119 ++++++++++++++++++++++++++++++++-
 java/com/xagasoft/gats/GatsObject.java |   2 +-
 2 files changed, 119 insertions(+), 2 deletions(-)

(limited to 'java/com/xagasoft/gats')

diff --git a/java/com/xagasoft/gats/GatsFloat.java b/java/com/xagasoft/gats/GatsFloat.java
index 62e763c..d70f910 100644
--- a/java/com/xagasoft/gats/GatsFloat.java
+++ b/java/com/xagasoft/gats/GatsFloat.java
@@ -1,21 +1,138 @@
 package com.xagasoft.gats;
 
 import java.io.InputStream;
+import java.io.DataInputStream;
 import java.io.OutputStream;
+import java.io.ByteArrayOutputStream;
+
+import java.lang.Math;
 
 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;
 	}
 
-	public void read( InputStream is, char cType )
+	public 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;
+		}
 	}
 
 	public 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 );
+		}
 	}
 };
 
diff --git a/java/com/xagasoft/gats/GatsObject.java b/java/com/xagasoft/gats/GatsObject.java
index 266a08f..8c398e8 100644
--- a/java/com/xagasoft/gats/GatsObject.java
+++ b/java/com/xagasoft/gats/GatsObject.java
@@ -46,7 +46,7 @@ public abstract class GatsObject
 
 			case 'f':
 			case 'F':
-		//		goRet = new GatsFloat();
+				goRet = new GatsFloat();
 				break;
 
 			case 'e':
-- 
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