1,Excerpt from the Java DataInputStream class, showing parts of the byte alignment and ordering code, which are extremely slow. The DataOutputStream implementation has a similar problem.

Power Java
High-Performance Java Software Development
James Schatzman and Roy Donehower
Listing 1. Excerpt from the Java DataInputStream class, showing parts of the byte alignment and ordering code, which are extremely slow. The DataOutputStream implementation has a similar problem.


public final double readDouble() throws IOException {
  return Double.longBitsToDouble(readLong());
}
public final long readLong() throws IOException {
   InputStream in = this.in;
   return ((long) (readInt()) << 32) + (readInt() & 0xFFFFFFFFL);
}
public final int readInt() throws IOException {
   InputStream in = this.in;
   int ch1 = in.read();
   int ch2 = in.read();
   int ch3 = in.read();
   int ch4 = in.read();
   if ((ch1 | ch2 | ch3 | ch4) < 0)
	     throw new EOFException();
   return ((ch1 << 24) + (ch2 << 16) + 
		(ch3 << 8) + (ch4 << 0));
}

Featured

Upcoming Events

AppTrends

Sign up for our newsletter.

I agree to this site's Privacy Policy.