X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.utils%2Fsrc%2Forg%2Fsimantics%2Futils%2Fbytes%2FBEFloat.java;fp=bundles%2Forg.simantics.utils%2Fsrc%2Forg%2Fsimantics%2Futils%2Fbytes%2FBEFloat.java;h=bf305223b9c852288ca9f324895541db4337da73;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

diff --git a/bundles/org.simantics.utils/src/org/simantics/utils/bytes/BEFloat.java b/bundles/org.simantics.utils/src/org/simantics/utils/bytes/BEFloat.java
new file mode 100644
index 000000000..bf305223b
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+++ b/bundles/org.simantics.utils/src/org/simantics/utils/bytes/BEFloat.java
@@ -0,0 +1,170 @@
+/*******************************************************************************
+ * Copyright (c) 2007- VTT Technical Research Centre of Finland.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+/*
+ * Created on Jan 21, 2005
+ * 
+ * Copyright Toni Kalajainen
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.simantics.utils.bytes;
+
+/**
+ * Big Endian float <-> byte array conversions
+ * Motorola order, Network order
+ *
+ * @author Toni Kalajainen
+ */
+public class BEFloat {
+	
+	/**
+	 * Convert float to byte array
+	 * @param l float value
+	 * @return byte array
+	 */
+	public static byte[] toBytes(float value)
+	{
+		byte array[] = new byte[4];
+		int l = Float.floatToIntBits(value);
+		array[0] = (byte) (l & 0xff);
+		array[1] = (byte) ((l >> 8) & 0xff);
+		array[2] = (byte) ((l >> 16) & 0xff);
+		array[3] = (byte) ((l >> 24) & 0xff);
+		return array;
+	}
+	
+	/**
+	 * Write float value to byte array
+	 * @param value the float value
+	 * @param array the byte array
+	 * @param offset the offset
+	 */
+	public static void write(float value, byte array[], int offset)
+	{
+		if (offset+4>array.length)
+			throw new IndexOutOfBoundsException();		
+		int l = Float.floatToIntBits(value);
+		array[0 + offset] = (byte) (l & 0xff);
+		array[1 + offset] = (byte) (l >> 8);
+		array[2 + offset] = (byte) (l >> 16);
+		array[3 + offset] = (byte) (l >> 24);
+	}
+	
+	/**
+	 * Write float value to byte array
+	 * @param value the float value
+	 * @param array the byte array
+	 * @param offset the offset
+	 */
+	public static void write(float value, byte array[])
+	{
+		if (array.length<4)
+			throw new IndexOutOfBoundsException();		
+		int l = Float.floatToIntBits(value);
+		array[0] = (byte) (l & 0xff);
+		array[1] = (byte) (l >> 8);
+		array[2] = (byte) (l >> 16);
+		array[3] = (byte) (l >> 24);
+	}	
+	
+	/**
+	 * read float value from byte array
+	 * @param array the array
+	 * @param offset offset
+	 * @return the value
+	 */
+	public static float toFloat(byte array[], int offset)
+	{
+		if (offset+4>array.length)
+			throw new IndexOutOfBoundsException();		
+		return 
+			Float.intBitsToFloat(
+			( ((int) array[0 + offset] & 0xFF) ) |
+			( ((int) array[1 + offset] & 0xFF) << 8) |
+			( ((int) array[2 + offset] & 0xFF) << 16) | 
+			( ((int) array[3 + offset] & 0xFF) << 24)); 
+	}
+	
+	/**
+	 * read float value from byte array
+	 * @param array the array
+	 * @return the value
+	 */
+	public static float toFloat(byte array[])
+	{
+		if (4>array.length)
+			throw new IndexOutOfBoundsException();		
+
+		return 
+		Float.intBitsToFloat(
+		( ((int) array[0] & 0xFF) ) |
+		( ((int) array[1] & 0xFF) << 8) |
+		( ((int) array[2] & 0xFF) << 16) | 
+		( ((int) array[3] & 0xFF) << 24)); 
+	}
+
+	/**
+	 * Test cases
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		System.out.println("min="+Float.MIN_VALUE+" max="+Float.MAX_VALUE);
+		float value = -123.123123123f;
+		byte array[] = toBytes(value);
+		System.out.print(value);
+		System.out.print(" = ");
+		printByteArray(array);
+		System.out.println();
+		
+		write(value, array, 0);
+		System.out.print(value);
+		System.out.print(" = ");
+		printByteArray(array);
+		System.out.println();
+		
+		write(value, array);
+		System.out.print(value);
+		System.out.print(" = ");
+		printByteArray(array);
+		System.out.println();
+		
+		value = toFloat(array, 0);
+		printByteArray(array);
+		System.out.print(" = ");
+		System.out.print(value);
+		System.out.println();
+				
+		value = toFloat(array);
+		printByteArray(array);
+		System.out.print(" = ");
+		System.out.print(value);
+		System.out.println();
+		
+	}
+	
+	public static void printByteArray(byte array[]) {
+		for (int i=0; i<array.length; i++) {
+			System.out.print(array[i] & 0xff);
+			if (i<array.length-1) 
+				System.out.print(",");
+		}
+	}
+}