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/*
* Copyright 2007 - 2018 ETH Zuerich, CISD and SIS.
*
* 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 ch.systemsx.cisd.hdf5;
import java.math.BigInteger;
import ch.systemsx.cisd.base.convert.NativeData;
import ch.systemsx.cisd.base.convert.NativeData.ByteOrder;
/**
* Utilities for converting signed integers to unsigned integers and vice versa.
*
* @author Bernd Rinn
*/
public final class UnsignedIntUtils
{
private final static short MAX_UINT_8_P1 = 256;
private final static short MAX_UINT_8 = MAX_UINT_8_P1 - 1;
private final static int MAX_UINT_16_P1 = 65536;
private final static int MAX_UINT_16 = MAX_UINT_16_P1 - 1;
private final static long MAX_UINT_32_P1 = 4294967296L;
private final static long MAX_UINT_32 = MAX_UINT_32_P1 - 1;
private final static BigInteger MAX_UINT_64_P1 = new BigInteger("2").pow(64);
private final static BigInteger MAX_UINT_64 = MAX_UINT_64_P1.subtract(BigInteger.ONE);
/**
* Converts <var>value</var> to <code>int8</code>.
*
* @throws IllegalArgumentException if <var>value</var> is either negative or too large to fit
* into <code>uint8</code>.
*/
public static byte toInt8(int value) throws IllegalArgumentException
{
if (value < 0 || value > MAX_UINT_8)
{
throw new IllegalArgumentException("Value " + Integer.toString(value)
+ " cannot be converted to uint8.");
}
return (byte) value;
}
/**
* Converts <var>value</var> as <code>int16</code>.
*
* @throws IllegalArgumentException if <var>value</var> is either negative or too large to fit
* into <code>uint16</code>.
*/
public static short toInt16(int value) throws IllegalArgumentException
{
if (value < 0 || value > MAX_UINT_16)
{
throw new IllegalArgumentException("Value " + Integer.toString(value)
+ " cannot be converted to uint16.");
}
return (short) value;
}
/**
* Converts <var>value</var> as <code>int32</code>.
*
* @throws IllegalArgumentException if <var>value</var> is either negative or too large to fit
* into <code>uint32</code>.
*/
public static int toInt32(long value) throws IllegalArgumentException
{
if (value < 0 || value > MAX_UINT_32)
{
throw new IllegalArgumentException("Value " + Long.toString(value)
+ " cannot be converted to uint32.");
}
return (int) value;
}
/**
* Converts <var>value</var> as <code>int64</code>.
*
* @throws IllegalArgumentException if <var>value</var> is either negative or too large to fit
* into <code>uint64</code>.
*/
public static long toInt64(BigInteger value) throws IllegalArgumentException
{
if (value.compareTo(BigInteger.ZERO) < 0 || value.compareTo(MAX_UINT_64) > 0)
{
throw new IllegalArgumentException("Value " + value.toString()
+ " cannot be converted to uint64.");
}
return value.longValue();
}
/**
* Converts <var>value</var> to <code>uint8</code>.
*/
public static short toUint8(byte value)
{
return (short) (value < 0 ? MAX_UINT_8_P1 + value : value);
}
/**
* Converts <var>value</var> to <code>uint16</code>.
*/
public static int toUint16(short value)
{
return value < 0 ? MAX_UINT_16_P1 + value : value;
}
/**
* Converts <var>value</var> to <code>uint32</code>.
*/
public static long toUint32(int value)
{
return value < 0 ? MAX_UINT_32_P1 + value : value;
}
/**
* Converts <var>value</var> to <code>uint64</code>.
*/
public static BigInteger toUint64(long value)
{
return new BigInteger(1, NativeData.longToByte(new long[]
{ value }, ByteOrder.BIG_ENDIAN));
}
}
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