Java Encode encodeVarUInt32(int unsignedValue, OutputStream outputStream)

Description

Encodes an unsigned uint32 value (represented as a signed int32 value) into a stream.

License

Open Source License

Parameter

Parameter	Description
unsignedValue	the value to encode, interpreted as unsigned
outputStream	the output stream

Return

the number of bytes written to the stream (1-5)

Declaration

static int encodeVarUInt32(int unsignedValue, OutputStream outputStream) throws IOException 

Method Source Code

//package com.java2s;
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

import java.io.IOException;

import java.io.OutputStream;

public class Main {
    /**//from ww  w.  ja  va  2  s. c o m
     * Encodes an unsigned uint32 value (represented as a signed int32 value) into a stream.
     * The sign bit of the value is re-interpreted as the high order bit for encoding purposes.
     *
     * @param unsignedValue the value to encode, interpreted as unsigned
     * @param outputStream  the output stream
     * @return the number of bytes written to the stream (1-5)
     */
    static int encodeVarUInt32(int unsignedValue, OutputStream outputStream) throws IOException {
        int length = 1;

        // byte 0 (needs a special case to test for negative)
        if (unsignedValue >= 0x80 || unsignedValue < 0) {
            outputStream.write((byte) (unsignedValue | 0x80));
            unsignedValue >>>= 7;
            length = 2;

            // byte 1
            if (unsignedValue >= 0x80) {
                outputStream.write((byte) (unsignedValue | 0x80));
                unsignedValue >>>= 7;
                length = 3;

                // byte 2
                if (unsignedValue >= 0x80) {
                    outputStream.write((byte) (unsignedValue | 0x80));
                    unsignedValue >>>= 7;
                    length = 4;

                    // byte 3
                    if (unsignedValue >= 0x80) {
                        outputStream.write((byte) (unsignedValue | 0x80));
                        unsignedValue >>>= 7;
                        length = 5;
                    }
                }
            }
        }

        // last byte
        outputStream.write((byte) unsignedValue);

        return length;
    }
}

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