Mega Code Archive
Make Int From Byte
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
/**
* ByteUtilities.java - Byte manipulation functions.
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
* @since MINA 2.0.0-M3
*/
public class Util{
/**
* Reads an int from 4 bytes of the given array at offset 0.
*
* @param b the byte array to read
* @param offset the offset at which to start
* @return the int value
*/
public static final int makeIntFromByte4(byte[] b) {
return makeIntFromByte4(b, 0);
}
/**
* Reads an int from 4 bytes of the given array at the given offset.
*
* @param b the byte array to read
* @param offset the offset at which to start
* @return the int value
*/
public static final int makeIntFromByte4(byte[] b, int offset) {
return b[offset] << 24 | (b[offset + 1] & 0xff) << 16
| (b[offset + 2] & 0xff) << 8 | (b[offset + 3] & 0xff);
}
/**
* Reads an int from 2 bytes of the given array at offset 0.
*
* @param b the byte array to read
* @return the int value
*/
public static final int makeIntFromByte2(byte[] b) {
return makeIntFromByte2(b, 0);
}
/**
* Reads an int from 2 bytes of the given array at the given offset.
*
* @param b the byte array to read
* @param offset the offset at which to start
* @return the int value
*/
public static final int makeIntFromByte2(byte[] b, int offset) {
return (b[offset] & 0xff) << 8 | (b[offset + 1] & 0xff);
}
}
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