/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman <swaldman@mchange.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.lang;
public final class
IntegerUtils
{
public final static long
UNSIGNED_MAX_VALUE = (
Integer.
MAX_VALUE * 2) + 1;
public static int
parseInt(
String intStr, int
dflt)
{
if (
intStr == null)
return
dflt;
try
{return
Integer.
parseInt(
intStr);}
catch (
NumberFormatException e)
{return
dflt;}
}
public static int
parseInt(
String intStr, int
radix, int
dflt)
{
if (
intStr == null)
return
dflt;
try
{return
Integer.
parseInt(
intStr,
radix);}
catch (
NumberFormatException e)
{return
dflt;}
}
public static int
intFromByteArray(byte[]
bytes, int
offset)
{
int
out = 0;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 0])) << 24;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 1])) << 16;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 2])) << 8;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 3])) << 0;
return
out;
}
public static byte[]
byteArrayFromInt(int
i)
{
byte[]
out = new byte[4];
intIntoByteArray(
i, 0,
out);
return
out;
}
public static void
intIntoByteArray(int
i, int
offset, byte[]
bytes)
{
bytes[
offset + 0] = (byte) ((
i >>> 24) & 0xFF);
bytes[
offset + 1] = (byte) ((
i >>> 16) & 0xFF);
bytes[
offset + 2] = (byte) ((
i >>> 8) & 0xFF);
bytes[
offset + 3] = (byte) ((
i >>> 0) & 0xFF);
}
public static int
intFromByteArrayLittleEndian(byte[]
bytes, int
offset)
{
int
out = 0;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 3])) << 24;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 2])) << 16;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 1])) << 8;
out |= ((int)
ByteUtils.
unsignedPromote(
bytes[
offset + 0])) << 0;
return
out;
}
public static void
intIntoByteArrayLittleEndian(int
i, int
offset, byte[]
bytes)
{
bytes[
offset + 3] = (byte) ((
i >>> 24) & 0xFF);
bytes[
offset + 2] = (byte) ((
i >>> 16) & 0xFF);
bytes[
offset + 1] = (byte) ((
i >>> 8) & 0xFF);
bytes[
offset + 0] = (byte) ((
i >>> 0) & 0xFF);
}
public static long
toUnsigned(int
i) { return 0x00000000FFFFFFFFL &
i; }
private
IntegerUtils()
{}
}