Revert "archive: Use memfd instead"

* It sucks, seems simplify the conditions, but more syscalls are
  made(read/seek/write), more context switch, futhermore AImageDecoder itself does support
  read raw buffer, and we are not intend to support multi-process decoding

This reverts commit f4826ea727.

app/src/main/java/com/hippo/UriArchiveAccessor.java

@@ -21,6 +21,10 @@ package com.hippo;
 import android.content.Context;
 import android.net.Uri;
 import android.os.ParcelFileDescriptor;
+import android.system.Os;
+import android.system.OsConstants;
+
+import java.io.FileDescriptor;
 
 public class UriArchiveAccessor {
     ParcelFileDescriptor pfd;
@@ -39,7 +43,7 @@ public class UriArchiveAccessor {
 
     private native int openArchive(int fd, long size);
 
-    public native int extractToMemfd(int index);
+    public native long extracttoOutputStream(int index);
 
     public native boolean needPassword();
 

app/src/main/java/com/hippo/ehviewer/gallery/ArchiveGalleryProvider.java

@@ -49,7 +49,7 @@ public class ArchiveGalleryProvider extends GalleryProvider2 {
     private final UriArchiveAccessor archiveAccessor;
     private final Stack<Integer> requests = new Stack<>();
     private final AtomicInteger extractingIndex = new AtomicInteger(GalleryPageView.INVALID_INDEX);
-    private final LinkedHashMap<Integer, Integer> streams = new LinkedHashMap<>();
+    private final LinkedHashMap<Integer, Long> streams = new LinkedHashMap<>();
     private final AtomicInteger decodingIndex = new AtomicInteger(GalleryPageView.INVALID_INDEX);
     private Thread archiveThread;
     private Thread decodeThread;
@@ -255,10 +255,10 @@ public class ArchiveGalleryProvider extends GalleryProvider2 {
                     }
                 }
 
-                int fd = archiveAccessor.extractToMemfd(index);
+                long addr = archiveAccessor.extracttoOutputStream(index);
 
                 synchronized (streams) {
-                    streams.put(index, fd);
+                    streams.put(index, addr);
                     streams.notify();
                 }
             }
@@ -270,7 +270,7 @@ public class ArchiveGalleryProvider extends GalleryProvider2 {
         public void run() {
             while (!Thread.currentThread().isInterrupted()) {
                 int index;
-                int fd;
+                Long addr;
                 synchronized (streams) {
                     if (streams.isEmpty()) {
                         try {
@@ -282,16 +282,16 @@ public class ArchiveGalleryProvider extends GalleryProvider2 {
                         continue;
                     }
 
-                    Iterator<Map.Entry<Integer, Integer>> iterator = streams.entrySet().iterator();
-                    Map.Entry<Integer, Integer> entry = iterator.next();
+                    Iterator<Map.Entry<Integer, Long>> iterator = streams.entrySet().iterator();
+                    Map.Entry<Integer, Long> entry = iterator.next();
                     iterator.remove();
                     index = entry.getKey();
-                    fd = entry.getValue();
+                    addr = entry.getValue();
                     decodingIndex.lazySet(index);
                 }
 
                 try {
-                    Image image = Image.decode(fd, false);
+                    Image image = Image.decodeAddr(addr, true);
                     if (image != null) {
                         notifyPageSucceed(index, image);
                     } else {

app/src/main/java/com/hippo/image/Image.java

@@ -71,6 +71,14 @@ public final class Image {
         return newFromAddr(nativeDecodeFdInt(fd));
     }
 
+    /**
+     * Decode image from {@code InputStream}
+     */
+    @Nullable
+    public static Image decodeAddr(Long addr, boolean partially) {
+        return newFromAddr(nativeDecodeAddr(addr));
+    }
+
     /**
      * Create a plain image from Bitmap
      */
@@ -91,6 +99,8 @@ public final class Image {
 
     private static native long nativeDecodeFdInt(int fd);
 
+    private static native long nativeDecodeAddr(long addr);
+
     private static native long nativeCreate(Bitmap bitmap);
 
     private static native void nativeRender(long nativePtr,