diff --git a/adb/adb_client.cpp b/adb/adb_client.cpp
index 0b1ba32..ef52189 100644
--- a/adb/adb_client.cpp
+++ b/adb/adb_client.cpp
@@ -46,21 +46,11 @@
 
 static const char* __adb_server_socket_spec;
 
-void adb_set_transport(TransportType type, const char* serial)
-{
+void adb_set_transport(TransportType type, const char* serial) {
     __adb_transport = type;
     __adb_serial = serial;
 }
 
-void adb_get_transport(TransportType* type, const char** serial) {
-    if (type) {
-        *type = __adb_transport;
-    }
-    if (serial) {
-        *serial = __adb_serial;
-    }
-}
-
 void adb_set_socket_spec(const char* socket_spec) {
     if (__adb_server_socket_spec) {
         LOG(FATAL) << "attempted to reinitialize adb_server_socket_spec " << socket_spec << " (was " << __adb_server_socket_spec << ")";
diff --git a/adb/adb_client.h b/adb/adb_client.h
index d35d705..d07c1e9 100644
--- a/adb/adb_client.h
+++ b/adb/adb_client.h
@@ -40,9 +40,6 @@
 // Set the preferred transport to connect to.
 void adb_set_transport(TransportType type, const char* _Nullable serial);
 
-// Get the preferred transport to connect to.
-void adb_get_transport(TransportType* _Nullable type, const char* _Nullable* _Nullable serial);
-
 // Set the socket specification for the adb server.
 // This function can only be called once, and the argument must live to the end of the process.
 void adb_set_socket_spec(const char* _Nonnull socket_spec);
diff --git a/include/private/android_filesystem_config.h b/include/private/android_filesystem_config.h
index c364317..c9e1923 100644
--- a/include/private/android_filesystem_config.h
+++ b/include/private/android_filesystem_config.h
@@ -96,6 +96,9 @@
 #define AID_DNS_TETHER    1052  /* DNS resolution daemon (tether: dnsmasq) */
 #define AID_WEBVIEW_ZYGOTE 1053 /* WebView zygote process */
 #define AID_VEHICLE_NETWORK 1054 /* Vehicle network service */
+#define AID_MEDIA_AUDIO   1055 /* GID for audio files on internal media storage */
+#define AID_MEDIA_VIDEO   1056 /* GID for video files on internal media storage */
+#define AID_MEDIA_IMAGE   1057 /* GID for image files on internal media storage */
 /* Changes to this file must be made in AOSP, *not* in internal branches. */
 
 #define AID_SHELL         2000  /* adb and debug shell user */
@@ -210,6 +213,9 @@
     { "dns_tether",    AID_DNS_TETHER, },
     { "webview_zygote", AID_WEBVIEW_ZYGOTE, },
     { "vehicle_network", AID_VEHICLE_NETWORK, },
+    { "media_audio",   AID_MEDIA_AUDIO, },
+    { "media_video",   AID_MEDIA_VIDEO, },
+    { "media_image",   AID_MEDIA_IMAGE, },
 
     { "shell",         AID_SHELL, },
     { "cache",         AID_CACHE, },
diff --git a/libsparse/include/sparse/sparse.h b/libsparse/include/sparse/sparse.h
index 42d4adb..356f65f 100644
--- a/libsparse/include/sparse/sparse.h
+++ b/libsparse/include/sparse/sparse.h
@@ -176,6 +176,13 @@
 int64_t sparse_file_len(struct sparse_file *s, bool sparse, bool crc);
 
 /**
+ * sparse_file_block_size
+ *
+ * @s - sparse file cookie
+ */
+unsigned int sparse_file_block_size(struct sparse_file *s);
+
+/**
  * sparse_file_callback - call a callback for blocks in sparse file
  *
  * @s - sparse file cookie
@@ -197,6 +204,24 @@
 		int (*write)(void *priv, const void *data, int len), void *priv);
 
 /**
+ * sparse_file_foreach_chunk - call a callback for data blocks in sparse file
+ *
+ * @s - sparse file cookie
+ * @sparse - write in the Android sparse file format
+ * @crc - append a crc chunk
+ * @write - function to call for each block
+ * @priv - value that will be passed as the first argument to write
+ *
+ * The function has the same behavior as 'sparse_file_callback', except it only
+ * iterates on blocks that contain data.
+ *
+ * Returns 0 on success, negative errno on error.
+ */
+int sparse_file_foreach_chunk(struct sparse_file *s, bool sparse, bool crc,
+	int (*write)(void *priv, const void *data, int len, unsigned int block,
+		     unsigned int nr_blocks),
+	void *priv);
+/**
  * sparse_file_read - read a file into a sparse file cookie
  *
  * @s - sparse file cookie
diff --git a/libsparse/sparse.c b/libsparse/sparse.c
index 311678a..b175860 100644
--- a/libsparse/sparse.c
+++ b/libsparse/sparse.c
@@ -199,6 +199,57 @@
 	return ret;
 }
 
+struct chunk_data {
+	void		*priv;
+	unsigned int	block;
+	unsigned int	nr_blocks;
+	int (*write)(void *priv, const void *data, int len, unsigned int block,
+		     unsigned int nr_blocks);
+};
+
+static int foreach_chunk_write(void *priv, const void *data, int len)
+{
+	struct chunk_data *chk = priv;
+
+	return chk->write(chk->priv, data, len, chk->block, chk->nr_blocks);
+}
+
+int sparse_file_foreach_chunk(struct sparse_file *s, bool sparse, bool crc,
+	int (*write)(void *priv, const void *data, int len, unsigned int block,
+		     unsigned int nr_blocks),
+	void *priv)
+{
+	int ret;
+	int chunks;
+	struct chunk_data chk;
+	struct output_file *out;
+	struct backed_block *bb;
+
+	chk.priv = priv;
+	chk.write = write;
+	chk.block = chk.nr_blocks = 0;
+	chunks = sparse_count_chunks(s);
+	out = output_file_open_callback(foreach_chunk_write, &chk,
+					s->block_size, s->len, false, sparse,
+					chunks, crc);
+
+	if (!out)
+		return -ENOMEM;
+
+	for (bb = backed_block_iter_new(s->backed_block_list); bb;
+			bb = backed_block_iter_next(bb)) {
+		chk.block = backed_block_block(bb);
+		chk.nr_blocks = (backed_block_len(bb) - 1) / s->block_size + 1;
+		ret = sparse_file_write_block(out, bb);
+		if (ret)
+			return ret;
+	}
+
+	output_file_close(out);
+
+	return ret;
+}
+
 static int out_counter_write(void *priv, const void *data __unused, int len)
 {
 	int64_t *count = priv;
@@ -230,6 +281,11 @@
 	return count;
 }
 
+unsigned int sparse_file_block_size(struct sparse_file *s)
+{
+	return s->block_size;
+}
+
 static struct backed_block *move_chunks_up_to_len(struct sparse_file *from,
 		struct sparse_file *to, unsigned int len)
 {