Implement DataInputStream

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

classpath/java/io/DataInputStream.java

@@ -0,0 +1,132 @@
+/* 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 DataInputStream extends InputStream implements DataInput {
+  private InputStream in;
+
+  public DataInputStream(InputStream in) {
+    this.in = in;
+  }
+
+  public void close() throws IOException {
+    in.close();
+  }
+
+  public int read(byte[] buffer) throws IOException {
+    return in.read(buffer);
+  }
+
+  public int read(byte[] buffer, int offset, int length) throws IOException {
+    return in.read(buffer, offset, length);
+  }
+
+  public void readFully(byte[] b) throws IOException {
+    readFully(b, 0, b.length);
+  }
+
+  public void readFully(byte[] b, int offset, int length) throws IOException {
+    while (length > 0) {
+      int count = read(b, offset, length);
+      if (count < 0) {
+        throw new EOFException("Reached EOF " + length + " bytes too early");
+      }
+      offset += count;
+      length -= count;
+    }
+  }
+
+  public int read() throws IOException {
+    return in.read();
+  }
+
+  private int read0() throws IOException {
+    int b = in.read();
+    if (b < 0) {
+      throw new EOFException();
+    }
+    return b;
+  }
+
+  public boolean readBoolean() throws IOException {
+    return read0() != 0;
+  }
+
+  public byte readByte() throws IOException {
+    return (byte)read0();
+  }
+
+  public short readShort() throws IOException {
+    return (short)((read0() << 8) | read0());
+  }
+
+  public int readInt() throws IOException {
+    return ((read0() << 24) | (read0() << 16) | (read0() << 8) | read0());
+  }
+
+  public float readFloat() throws IOException {
+    return Float.floatToIntBits(readInt());
+  }
+
+  public double readDouble() throws IOException {
+    return Double.doubleToLongBits(readLong());
+  }
+
+  public long readLong() throws IOException {
+    return ((readInt() & 0xffffffffl) << 32) | (readInt() & 0xffffffffl);
+  }
+
+  public char readChar() throws IOException {
+    return (char)readShort();
+  }
+
+  public int readUnsignedByte() throws IOException {
+    return readByte() & 0xff;
+  }
+
+  public int readUnsignedShort() throws IOException {
+    return readShort() & 0xffff;
+  }
+
+  public String readUTF() throws IOException {
+    int length = readUnsignedShort();
+    byte[] bytes = new byte[length];
+    readFully(bytes);
+    return new String(bytes, "UTF-8");
+  }
+
+  @Deprecated
+  public String readLine() throws IOException {
+    int c = read();
+    if (c < 0) {
+      return null;
+    } else if (c == '\n') {
+      return "";
+    }
+    StringBuilder builder = new StringBuilder();
+    for (;;) {
+      builder.append((char)c);
+      c = read();
+      if (c < 0 || c == '\n') {
+        return builder.toString();
+      }
+    }
+  }
+
+  public int skipBytes(int n) throws IOException {
+    for (int count = 0; count < n; ++count) {
+      if (read() < 0) {;
+        return count;
+      }
+    }
+    return n;
+  }
+}