Implementation for getting data for import csv

AnkiDroid/src/main/java/com/ichi2/libanki/DecksV16.kt

@@ -873,3 +873,8 @@ class DecksV16(private val col: Collection, private val decksBackend: DecksBacke
     val Deck.name: str get() = this.getString("name")
     val Deck.conf: Long get() = this.getLong("conf")
 }
+
+// These take and return bytes that the frontend TypeScript code will encode/decode.
+fun CollectionV16.getDeckNamesRaw(input: ByteArray): ByteArray {
+    return backend.getDeckNamesRaw(input)
+}

AnkiDroid/src/main/java/com/ichi2/libanki/ModelsV16.kt

@@ -720,3 +720,12 @@ private fun Deck.getLongOrNull(key: String): int? {
         return null
     }
 }
+
+// These take and return bytes that the frontend TypeScript code will encode/decode.
+fun CollectionV16.getNotetypeNamesRaw(input: ByteArray): ByteArray {
+    return backend.getNotetypeNamesRaw(input)
+}
+
+fun CollectionV16.getFieldNamesRaw(input: ByteArray): ByteArray {
+    return backend.getFieldNamesRaw(input)
+}

AnkiDroid/src/main/java/com/ichi2/libanki/importer/BackendCsvImportV16.kt

@@ -0,0 +1,29 @@
+/***************************************************************************************
+ * Copyright (c) 2022 Ankitects Pty Ltd <http://apps.ankiweb.net>                       *
+ *                                                                                      *
+ * This program is free software; you can redistribute it and/or modify it under        *
+ * the terms of the GNU General Public License as published by the Free Software        *
+ * Foundation; either version 3 of the License, or (at your option) any later           *
+ * version.                                                                             *
+ *                                                                                      *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY      *
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A      *
+ * PARTICULAR PURPOSE. See the GNU General Public License for more details.             *
+ *                                                                                      *
+ * You should have received a copy of the GNU General Public License along with         *
+ * this program.  If not, see <http://www.gnu.org/licenses/>.                           *
+ ****************************************************************************************/
+
+package com.ichi2.libanki.importer
+
+import com.ichi2.libanki.CollectionV16
+
+// These take and return bytes that the frontend TypeScript code will encode/decode.
+
+fun CollectionV16.getCsvMetadataRaw(input: ByteArray): ByteArray {
+    return backend.getCsvMetadataRaw(input)
+}
+
+fun CollectionV16.importCsvRaw(input: ByteArray): ByteArray {
+    return backend.importCsvRaw(input)
+}