add missing file

Author: LabyStudio

README.md

@@ -23,7 +23,7 @@ repositories {
 }
 
 dependencies {
-    implementation 'com.github.LabyStudio:java-spotify-api:1.1.13:all'
+    implementation 'com.github.LabyStudio:java-spotify-api:+:all'
 }
 ```
 

src/main/java/de/labystudio/spotifyapi/platform/windows/api/playback/MemoryPlaybackAccessor.java

@@ -0,0 +1,91 @@
+package de.labystudio.spotifyapi.platform.windows.api.playback;
+
+import de.labystudio.spotifyapi.platform.windows.api.WinProcess;
+
+/**
+ * Accessor to read the duration, position and playing state from the Spotify process.
+ *
+ * @author LabyStudio
+ */
+public class MemoryPlaybackAccessor implements PlaybackAccessor {
+
+    private static final long MIN_TRACK_DURATION = 1000; // 1 second
+    private static final long MAX_TRACK_DURATION = 1000 * 60 * 10; // 10 minutes
+
+    private final WinProcess process;
+    private final PointerRegistry pointerRegistry;
+
+    private int length;
+    private int position;
+    private boolean isPlaying;
+
+    /**
+     * Creates a new instance of the PlaybackAccessor.
+     *
+     * @param process The Spotify process to read from.
+     * @param address The reference address of the playback section
+     */
+    public MemoryPlaybackAccessor(WinProcess process, long address) {
+        this.process = process;
+
+        // Create pointer registry to calculate the absolute addresses using the relative offsets
+        this.pointerRegistry = new PointerRegistry(0x0CFF4498, address);
+        this.pointerRegistry.register("position", 0x0CFF4810);
+        this.pointerRegistry.register("length", 0x0CFF4820);
+        this.pointerRegistry.register("is_playing", 0x0CFF4850); // 1=true, 0=false
+
+        this.update();
+    }
+
+    /**
+     * Read the current length, position and playing state from the Spotify process.
+     *
+     * @return true if the new values are valid, false otherwise
+     */
+    @Override
+    public boolean update() {
+        this.position = this.process.readInteger(this.pointerRegistry.getAddress("position"));
+        this.length = this.process.readInteger(this.pointerRegistry.getAddress("length"));
+        this.isPlaying = this.process.readBoolean(this.pointerRegistry.getAddress("is_playing"));
+        return this.isValid();
+    }
+
+    /**
+     * Checks if the current values are valid.
+     * <p>
+     * To make sure that we have correct values from the memory address,
+     * we have to set some rules what kind of duration is correct.
+     * <p>
+     * The values are correct if:<br>
+     * - position {@literal <}= length<br>
+     * - length {@literal >} 0<br>
+     * - length {@literal <}= 10 minutes<br>
+     * - position {@literal >}= 1 second<br>
+     * - the parity bits are correct<br>
+     *
+     * @return true if the current values are valid, false otherwise
+     */
+    @Override
+    public boolean isValid() {
+        return this.position <= this.length
+                && this.position >= 0
+                && this.length <= MAX_TRACK_DURATION
+                && this.length >= MIN_TRACK_DURATION;
+    }
+
+    @Override
+    public int getLength() {
+        return this.length;
+    }
+
+    @Override
+    public int getPosition() {
+        return this.position;
+    }
+
+    @Override
+    public boolean isPlaying() {
+        return this.isPlaying;
+    }
+
+}