Initial push

src/main/kotlin/Updater.kt

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+import java.awt.Image
+import java.io.File
+import java.io.RandomAccessFile
+import java.net.URL
+import java.util.concurrent.Executors
+import javax.swing.ImageIcon
+
+object Updater {
+
+    private var status = UpdateStatus.DOWNLOADING
+
+    fun checkUpdate(): Boolean{
+        val localMD5 = Checksum.getLocalChecksum(Settings.SAVE_DIR + File.separator + Settings.SAVE_NAME)
+        val remoteMD5 = Checksum.getRemoteChecksum(Settings.DOWNLOAD_URL)
+
+        return localMD5 != remoteMD5
+    }
+
+    fun runUpdate(){
+        val t = Thread() {
+            var oldText = MainWindow.loadingLabel.text
+            MainWindow.loadingLabel.text = "Updating client..."
+            MainWindow.playButton.isEnabled = false
+            var downloaded = 0
+            var lastBarUpdate = 0
+
+            val connection = URL(Settings.DOWNLOAD_URL).openConnection()
+            connection.connect()
+
+            val length = connection.contentLength
+
+            if (!File(Settings.SAVE_DIR).exists()) {
+                File(Settings.SAVE_DIR).mkdir()
+            }
+            if (File(Settings.SAVE_DIR + File.separator + Settings.SAVE_NAME).exists()) {
+                File(Settings.SAVE_DIR + File.separator + Settings.SAVE_NAME).delete()
+            }
+
+            File(Settings.SAVE_DIR + File.separator + Settings.SAVE_NAME).createNewFile()
+
+            val file = RandomAccessFile(Settings.SAVE_DIR + File.separator + Settings.SAVE_NAME, "rw")
+
+            val stream = connection.getInputStream()
+
+            while(status == UpdateStatus.DOWNLOADING){
+                val buffer = if(length - downloaded > 1024){
+                    ByteArray(1024)
+                } else {
+                    ByteArray(length - downloaded)
+                }
+
+                val read = stream.read(buffer)
+
+                if(read == -1) break
+
+                val progress = ((downloaded / length.toFloat()) * 100).toInt()
+                val barLength = 1 + ((progress / 100.0) * 695.0).toInt()
+
+                MainWindow.loadingLabel.text = "Updating client... $progress%"
+
+                if(barLength - lastBarUpdate > 5){
+                    MainWindow.loadingBar.icon = ImageIcon((MainWindow.loadingBar.icon as ImageIcon).image.getScaledInstance(barLength, 31, Image.SCALE_FAST))
+                    MainWindow.loadingBar.placeAt(103, MainWindow.height - 33, barLength, 31)
+                    lastBarUpdate = barLength
+                }
+
+                file.write(buffer, 0, read)
+                downloaded += read
+
+                if(downloaded >= length){
+                    MainWindow.loadingLabel.text = oldText
+                    MainWindow.playButton.isEnabled = true
+                    file.close()
+                    status = UpdateStatus.COMPLETE
+                }
+            }
+            MainWindow.loadingBar.icon = ImageIcon((MainWindow.loadingBar.icon as ImageIcon).image.getScaledInstance(695, 31, Image.SCALE_FAST))
+            MainWindow.loadingBar.placeAt(103, MainWindow.height - 33, 695, 31)
+        }.start()
+    }
+
+    internal enum class UpdateStatus{
+        DOWNLOADING,
+        COMPLETE
+    }
+}