Java InputStream Read Long readLong(InputStream inputStream)

Description

read Long

License

Apache License

Declaration

public static long readLong(InputStream inputStream) throws IOException 

Method Source Code

//package com.java2s;
/** Copyright 2013 BlackBerry, Inc.
 *
 *  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. /*  www  .j a va  2  s . com*/
 */

import java.io.IOException;
import java.io.InputStream;

public class Main {
    public static long readLong(InputStream inputStream) throws IOException {
        long value = 0L;
        int i = 0;
        long b;
        while (((b = inputStream.read()) & 0x80L) != 0) {
            value |= (b & 0x7F) << i;
            i += 7;
            if (i >= 7 * 10) {
                throw new IOException("Didn't reach the end of the long varint after 10 bytes.");
            }
        }
        value |= b << i;

        // un-zig-zag it
        long temp = (((value << 63) >> 63) ^ value) >> 1;
        // since we lost that first bit during all that zigging and zagging,
        // make sure it's the right one now
        value = temp ^ (value & (1L << 63));

        return value;
    }
}

Related

1. readLong(InputStream in)
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