Add a minimal implementation of DataOutputStream

This implements all the methods required by the DataOutput interface; to
run Bio-Formats' bfconvert tool, actually only the write() and writeByte()
methods would be required.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

classpath/java/io/DataOutputStream.java

@@ -0,0 +1,97 @@
+/* Copyright (c) 2008-2013, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.io;
+
+public class DataOutputStream extends OutputStream implements DataOutput {
+  private OutputStream out;
+
+  public DataOutputStream(OutputStream out) {
+    this.out = out;
+  }
+
+  public void close() throws IOException {
+    out.close();
+  }
+
+  public void flush() throws IOException {
+    out.flush();
+  }
+
+  public void write(byte[] buffer) throws IOException {
+    out.write(buffer);
+  }
+
+  public void write(byte[] buffer, int offset, int length) throws IOException {
+    out.write(buffer, offset, length);
+  }
+
+  public void write(int b) throws IOException {
+    out.write(b);
+  }
+
+  public void writeBoolean(boolean b) throws IOException {
+    writeByte(b ? 1 : 0);
+  }
+
+  public void writeByte(int b) throws IOException {
+    out.write(b);
+  }
+
+  public void writeShort(int s) throws IOException {
+    write((byte)(s >> 8));
+    write((byte)s);
+  }
+
+  public void writeInt(int i) throws IOException {
+    write((byte)(i >> 24));
+    write((byte)(i >> 16));
+    write((byte)(i >> 8));
+    write((byte)i);
+  }
+
+  public void writeFloat(float f) throws IOException {
+    writeInt(Float.floatToIntBits(f));
+  }
+
+  public void writeDouble(double d) throws IOException {
+    writeLong(Double.doubleToLongBits(d));
+  }
+
+  public void writeLong(long l) throws IOException {
+    write((byte)(l >> 56));
+    write((byte)(l >> 48));
+    write((byte)(l >> 40));
+    write((byte)(l >> 32));
+    write((byte)(l >> 24));
+    write((byte)(l >> 16));
+    write((byte)(l >> 8));
+    write((byte)l);
+  }
+
+  public void writeChar(int ch) throws IOException {
+    write((byte)(ch >> 8));
+    write((byte)ch);
+  }
+
+  public void writeChars(String s) throws IOException {
+    for (char ch : s.toCharArray()) {
+      writeChar(ch & 0xffff);
+    }
+  }
+
+  public void writeBytes(String s) throws IOException {
+    out.write(s.getBytes());
+  }
+
+  public void writeUTF(String s) throws IOException {
+    out.write(s.getBytes("UTF-8"));
+  }
+}