Follow-up to #99.

- Many code style changes.
- Don't increment combo if missing the last slider circle.
- Added player name in ranking screen.
- Don't show null/default player names.
- Only import replays with .osr extension.
- Display loading status for importing replays.
- Moved MD5InputStreamWrapper to package "opsu.io".

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/io/MD5InputStreamWrapper.java

@@ -0,0 +1,118 @@
+/*
+ * opsu! - an open-source osu! client
+ * Copyright (C) 2014, 2015 Jeffrey Han
+ *
+ * opsu! is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * opsu! is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with opsu!.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package itdelatrisu.opsu.io;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * Wrapper for an InputStream that computes the MD5 hash while reading the stream.
+ */
+public class MD5InputStreamWrapper extends InputStream {
+	/** The input stream. */
+	private InputStream in;
+
+	/** Whether the end of stream has been reached. */
+	private boolean eof = false;
+
+	/** A MessageDigest object that implements the MD5 digest algorithm. */
+	private MessageDigest md;
+
+	/** The computed MD5 hash. */
+	private String md5;
+
+	/**
+	 * Constructor.
+	 * @param in the input stream
+	 * @throws NoSuchAlgorithmException if no Provider supports a MessageDigestSpi implementation for the MD5 algorithm
+	 */
+	public MD5InputStreamWrapper(InputStream in) throws NoSuchAlgorithmException {
+		this.in = in;
+		this.md = MessageDigest.getInstance("MD5");
+	}
+
+	@Override
+	public int read() throws IOException {
+		int bytesRead = in.read();
+		if (bytesRead >= 0)
+			md.update((byte) bytesRead);
+		else
+			eof = true;
+		return bytesRead;
+	}
+
+	@Override
+	public int available() throws IOException { return in.available(); }
+
+	@Override
+	public void close() throws IOException { in.close(); }
+
+	@Override
+	public synchronized void mark(int readlimit) { in.mark(readlimit); }
+
+	@Override
+	public boolean markSupported() { return in.markSupported(); }
+
+	@Override
+	public int read(byte[] b, int off, int len) throws IOException {
+		int bytesRead = in.read(b, off, len);
+		if (bytesRead >= 0)
+			md.update(b, off, bytesRead);
+		else
+			eof = true;
+		return bytesRead;
+	}
+
+	@Override
+	public int read(byte[] b) throws IOException { return read(b, 0, b.length); }
+
+	@Override
+	public synchronized void reset() throws IOException {
+		throw new RuntimeException("The reset() method is not implemented.");
+	}
+
+	@Override
+	public long skip(long n) throws IOException {
+		throw new RuntimeException("The skip() method is not implemented.");
+	}
+
+	/**
+	 * Returns the MD5 hash of the input stream.
+	 * @throws IOException if the end of stream has not yet been reached and a call to {@link #read(byte[])} fails
+	 */
+	public String getMD5() throws IOException {
+		if (md5 != null)
+			return md5;
+
+		if (!eof) {  // read the rest of the stream
+			byte[] buf = new byte[0x1000];
+			while (!eof)
+				read(buf);
+		}
+
+		byte[] md5byte = md.digest();
+		StringBuilder result = new StringBuilder();
+		for (byte b : md5byte)
+			result.append(String.format("%02x", b));
+		md5 = result.toString();
+		return md5;
+	}
+}