Java Long Number From longFromBigEndainArray(byte[] buf, int offset, int len)

Description

utility to build a long from values in an array of bytes in bigEndian order

License

Open Source License

Parameter

Parameter	Description
buf	byte array source
offset	offset into array
len	number to read (must be 8 or less

Return

a long

Declaration

public static long longFromBigEndainArray(byte[] buf, int offset, int len) 

Method Source Code

//package com.java2s;
/**//w w w  . j  av  a2 s  .  c o m
 * static byte array utilities
 *
 * Copyright (c) 2004, Pat Farrell, All rights reserved.
 * 
 * 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. * 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.
 */

public class Main {
    /** 
     * utility to build a long from values in an array of bytes in bigEndian order
     * @param buf byte array source
     * @param offset offset into array
     * @param len number to read (must be  8 or less
     * @return a long
     */
    public static long longFromBigEndainArray(byte[] buf, int offset, int len) {
        long val = 0;
        for (int i = 0; i < len; i++) {
            val = val << 8;
            int d = (0xff & buf[i + offset]);
            val += d;
        }
        return val;
    }
}

Related

1. longFromBase64(String value)
2. longFromByteArray(byte[] bytes)
3. longFromByteArray(final byte[] buf, final int offset)
4. longFromBytes(byte b8, byte b7, byte b6, byte b5, byte b4, byte b3, byte b2, byte b1)
5. longFrombytes(byte[] b, int pos)