Writes a string to the OutputStream formatted as a .NET string. - Java java.io

Java examples for java.io:OutputStream

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Description

Writes a string to the OutputStream formatted as a .NET string.

Demo Code


//package com.java2s;

import java.io.IOException;

import java.io.OutputStream;

import java.nio.charset.Charset;

public class Main {
    /**// w  w  w  .  j  a  v  a 2s . c o  m
     * Writes a string to the stream formatted as a .NET string.
     * @param out The output stream
     * @param value The string to write
     * @throws IOException if an IO error occurs
     */
    public static void writeString(final OutputStream out, String value)
            throws IOException {
        if (value == null) //Null check
            throw new NullPointerException("String cannot be null");

        //System.out.printf("String: (Length: %s)\n", value.length());

        write7BitEncodedInt(out, value.length()); //Write the length of the string

        byte[] bytes = value.getBytes(Charset.forName("utf-8"));

        out.write(bytes); //Write  the string bytes

        //printBytes(bytes);
    }

    /**
     * Writes the integer to the stream as a 7 bit encoded integer
     * @param out The output stream
     * @param value The integer to write
     * @throws IOException if an IO error occurs
     */
    public static void write7BitEncodedInt(final OutputStream out, int value)
            throws IOException {
        //Based on the .NET implementation.  See http://referencesource.microsoft.com/#mscorlib/system/io/binarywriter.cs,407

        //Write out an int 7 bits at a time.  The high bit of the byte, when on, tells reader to continue reading more bytes.
        int v = value;

        while (v >= 0x80) {
            out.write(new byte[] { (byte) (v | 0x80) });
            v >>= 7;
        }

        out.write(new byte[] { (byte) v });
    }
}

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