Make Int From Byte : byte « Data Type « Java

1. Java
2. Data Type
3. byte

Make Int From Byte

     


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 *  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
 *
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 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
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/**
 * 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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