CRLFOutputStream.java Source code

Introduction

Here is the source code for CRLFOutputStream.java

Source

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Convert lines into the canonical format, that is, terminate lines with the
 * CRLF sequence.
 * 
 * @author John Mani
 */
public class CRLFOutputStream extends FilterOutputStream {
    protected int lastb = -1;

    protected boolean atBOL = true; // at beginning of line?

    private static final byte[] newline = { (byte) '\r', (byte) '\n' };

    public CRLFOutputStream(OutputStream os) {
        super(os);
    }

    public void write(int b) throws IOException {
        if (b == '\r') {
            writeln();
        } else if (b == '\n') {
            if (lastb != '\r')
                writeln();
        } else {
            out.write(b);
            atBOL = false;
        }
        lastb = b;
    }

    public void write(byte b[]) throws IOException {
        write(b, 0, b.length);
    }

    public void write(byte b[], int off, int len) throws IOException {
        int start = off;

        len += off;
        for (int i = start; i < len; i++) {
            if (b[i] == '\r') {
                out.write(b, start, i - start);
                writeln();
                start = i + 1;
            } else if (b[i] == '\n') {
                if (lastb != '\r') {
                    out.write(b, start, i - start);
                    writeln();
                }
                start = i + 1;
            }
            lastb = b[i];
        }
        if ((len - start) > 0) {
            out.write(b, start, len - start);
            atBOL = false;
        }
    }

    /*
     * Just write out a new line, something similar to out.println()
     */
    public void writeln() throws IOException {
        out.write(newline);
        atBOL = true;
    }
}