Cache server CRCs

src/org/apollo/fs/IndexedFileSystem.java

@@ -7,6 +7,7 @@ import java.io.RandomAccessFile;
 import java.nio.ByteBuffer;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.Arrays;
 import java.util.zip.CRC32;
 
 import com.google.common.base.Preconditions;
@@ -24,6 +25,11 @@ public final class IndexedFileSystem implements Closeable {
 	 */
 	private ByteBuffer crcTable;
 
+	/**
+	 * The {@link #crcTable} represented as an {@code int} array.
+	 */
+	private int[] crcs;
+
 	/**
 	 * The data file.
 	 */
@@ -143,6 +149,22 @@ public final class IndexedFileSystem implements Closeable {
 		throw new IllegalStateException("Cannot get CRC table from a writable file system.");
 	}
 
+	/**
+	 * Gets the CRC table as an {@code int} array.
+	 *
+	 * @return The CRC table as an {@code int} array.
+	 * @throws IOException If there is an error accessing files to create the table.
+	 */
+	public int[] getCrcs() throws IOException {
+		if (crcs != null) {
+			return crcs;
+		}
+
+		ByteBuffer buffer = getCrcTable();
+		Arrays.setAll(crcs, crc -> buffer.getInt());
+		return crcs;
+	}
+
 	/**
 	 * Gets a file.
 	 *

src/org/apollo/login/LoginService.java

@@ -3,7 +3,6 @@ package org.apollo.login;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.nio.ByteBuffer;
 import java.util.Arrays;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -120,12 +119,8 @@ public final class LoginService extends Service {
 			return true;
 		}
 
-		ByteBuffer buffer = getContext().getFileSystem().getCrcTable();
-
 		int[] clientCrcs = request.getArchiveCrcs();
-		int[] serverCrcs = new int[clientCrcs.length];
-
-		Arrays.setAll(serverCrcs, crc -> buffer.getInt());
+		int[] serverCrcs = getContext().getFileSystem().getCrcs();
 
 		if (Arrays.equals(clientCrcs, serverCrcs)) {
 			return false;