Count the number of bytes read through the stream : Stream « File Input Output « Java

1. Java
2. File Input Output
3. Stream

Count the number of bytes read through the stream

    
// CountInputStream.java
// $Id: CountInputStream.java,v 1.1 2001/04/11 19:03:06 ylafon Exp $
// (c) COPYRIGHT MIT, INRIA and Keio, 2001.
// Please first read the full copyright statement in file COPYRIGHT.html



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

/**
 * count the number of bytes read through the stream
 */
public class CountInputStream extends InputStream {
  long count = 0;

  long marked = -1;

  InputStream is;

  public int available() throws IOException {
    return is.available();
  }

  public boolean markSupported() {
    return is.markSupported();
  }

  public int read() throws IOException {
    int r = is.read();
    if (r > 0) {
      count++;
    }
    return r;
  }

  public int read(byte[] b, int off, int len) throws IOException {
    int r = is.read(b, off, len);
    if (r > 0) {
      count += r;
    }
    return r;
  }

  public long skip(long skipped) throws IOException {
    long l = is.skip(skipped);
    if (l > 0) {
      count += l;
    }
    return l;
  }

  public void mark(int readlimit) {
    is.mark(readlimit);
    marked = count;
  }

  public void reset() throws IOException {
    is.reset();
    count = marked;
  }

  public void close() throws IOException {
    is.close();
  }

  /**
   * get the actual number of bytes read
   * 
   * @return a long, the number of bytes read
   */
  public long getBytesRead() {
    return count;
  }

  public CountInputStream(InputStream is) {
    this.is = is;
  }
}

   
    
    
    
  

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