Java Long Number From toLongs(byte[] value, int offset, int num)

Description

to Longs

License

Apache License

Declaration

public static long[] toLongs(byte[] value, int offset, int num) 

Method Source Code

//package com.java2s;
/**/*  ww w .  j  a  v  a2  s . co  m*/
 * 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 {
    public static long[] toLongs(byte[] value, int offset, int num) {
        long[] values = new long[num];
        int idx = 0;
        for (int i = offset; i < offset + (num * 8); i += 8) {
            values[idx++] = getLong(value, i);
        }
        return values;
    }

    public static long[] toLongs(byte[] value, int offset) {
        int length = getInt(value, offset);
        return toLongs(value, offset + 4, length);
    }

    public static long getLong(final byte[] b, final int offset) {
        return (b[offset + 0] & 0xFFL) << 56 | (b[offset + 1] & 0xFFL) << 48 | (b[offset + 2] & 0xFFL) << 40
                | (b[offset + 3] & 0xFFL) << 32 | (b[offset + 4] & 0xFFL) << 24 | (b[offset + 5] & 0xFFL) << 16
                | (b[offset + 6] & 0xFFL) << 8 | (b[offset + 7] & 0xFFL) << 0;
    }

    public static int getInt(final byte[] b, final int offset) {
        return (b[offset + 0] & 0xFF) << 24 | (b[offset + 1] & 0xFF) << 16 | (b[offset + 2] & 0xFF) << 8
                | (b[offset + 3] & 0xFF) << 0;
    }
}

Related

1. toLongMatrix(Number[][] matrix)
2. toLongMin(double[] in, long[] out)
3. toLongObject(Object obj)
4. toLongs(byte[] bytes)
5. toLongs(byte[] readBuffer, int o, int l)
6. toLongs(int[] array)
7. toLongs(Long[] values)
8. toLongTime()
9. toLongTimestamp(Object cell)