From bc1c4b3ec1893a25cb5f9e52185a19c9b330366e Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Wed, 25 Sep 2019 20:37:20 +0200
Subject: ANDROID: Initial code for external storage enumerator

---
 .../org/scummvm/scummvm/ExternalStorage.java       | 142 +++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 backends/platform/android/org/scummvm/scummvm/ExternalStorage.java

(limited to 'backends/platform/android/org')

diff --git a/backends/platform/android/org/scummvm/scummvm/ExternalStorage.java b/backends/platform/android/org/scummvm/scummvm/ExternalStorage.java
new file mode 100644
index 0000000000..42ec185928
--- /dev/null
+++ b/backends/platform/android/org/scummvm/scummvm/ExternalStorage.java
@@ -0,0 +1,142 @@
+package org.scummvm.scummvm;
+
+import android.os.Environment;
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Scanner;
+
+/**
+ * Contains helper methods to get list of available media
+ */
+public class ExternalStorage {
+	public static final String SD_CARD = "sdCard";
+	public static final String EXTERNAL_SD_CARD = "externalSdCard";
+	public static final String DATA_DIRECTORY = "ScummVM data directory";
+
+	/**
+	 * @return True if the external storage is available. False otherwise.
+	 */
+	public static boolean isAvailable() {
+		String state = Environment.getExternalStorageState();
+		if (Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
+			return true;
+		}
+		return false;
+	}
+
+	public static String getSdCardPath() {
+		return Environment.getExternalStorageDirectory().getPath() + "/";
+	}
+
+	/**
+	 * @return True if the external storage is writable. False otherwise.
+	 */
+	public static boolean isWritable() {
+		String state = Environment.getExternalStorageState();
+		if (Environment.MEDIA_MOUNTED.equals(state)) {
+			return true;
+		}
+		return false;
+
+	}
+
+	/**
+	 * @return A map of all storage locations available
+	 */
+	public static Map<String, String> getAllStorageLocations() {
+		Map<String, String> map = new HashMap<String, String>(10);
+
+		List<String> mMounts = new ArrayList<String>(10);
+		List<String> mVold = new ArrayList<String>(10);
+		mMounts.add("/mnt/sdcard");
+		mVold.add("/mnt/sdcard");
+
+		try {
+			File mountFile = new File("/proc/mounts");
+			if (mountFile.exists()){
+				Scanner scanner = new Scanner(mountFile);
+				while (scanner.hasNext()) {
+					String line = scanner.nextLine();
+					if (line.startsWith("/dev/block/vold/")) {
+						String[] lineElements = line.split(" ");
+						String element = lineElements[1];
+
+						// don't add the default mount path
+						// it's already in the list.
+						if (!element.equals("/mnt/sdcard"))
+							mMounts.add(element);
+					}
+				}
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+
+		try {
+			File voldFile = new File("/system/etc/vold.fstab");
+			if (voldFile.exists()){
+				Scanner scanner = new Scanner(voldFile);
+				while (scanner.hasNext()) {
+					String line = scanner.nextLine();
+					if (line.startsWith("dev_mount")) {
+						String[] lineElements = line.split(" ");
+						String element = lineElements[2];
+
+						if (element.contains(":"))
+							element = element.substring(0, element.indexOf(":"));
+						if (!element.equals("/mnt/sdcard"))
+							mVold.add(element);
+					}
+				}
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+
+
+		for (int i = 0; i < mMounts.size(); i++) {
+			String mount = mMounts.get(i);
+			if (!mVold.contains(mount))
+				mMounts.remove(i--);
+		}
+		mVold.clear();
+
+		List<String> mountHash = new ArrayList<String>(10);
+
+		for (String mount : mMounts){
+			File root = new File(mount);
+			if (root.exists() && root.isDirectory() && root.canRead()) {
+				File[] list = root.listFiles();
+				String hash = "[";
+				if (list != null) {
+					for (File f : list) {
+						hash += f.getName().hashCode() + ":" + f.length() + ", ";
+					}
+				}
+				hash += "]";
+				if (!mountHash.contains(hash)){
+					String key = SD_CARD + "_" + map.size();
+					if (map.size() == 0) {
+						key = SD_CARD;
+					} else if (map.size() == 1) {
+						key = EXTERNAL_SD_CARD;
+					}
+					mountHash.add(hash);
+					map.put(key, root.getAbsolutePath());
+				}
+			}
+		}
+
+		mMounts.clear();
+
+		map.put(SD_CARD, Environment.getDataDirectory().getAbsolutePath());
+
+		if (map.isEmpty()) {
+			map.put(DATA_DIRECTORY, Environment.getExternalStorageDirectory().getAbsolutePath());
+		}
+		return map;
+	}
+}
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