From c3a2f0580ec7cd6ef39aa0966443b048b76f5360 Mon Sep 17 00:00:00 2001
From: "CaptainDario @ MBP M1" <daapplab@gmail.com>
Date: Wed, 10 Jan 2024 10:48:35 +0100
Subject: [PATCH 1/3] rollback tf lite to version 2.11 to allow using
 minSdkVersion 19

---
 android/build.gradle | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/android/build.gradle b/android/build.gradle
index 8cf93da..61cfc68 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -55,13 +55,13 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 26
+        minSdkVersion 19
     }
 }
 
 
 dependencies {
-    def tflite_version = "2.12.0"
+    def tflite_version = "2.11.0"
     
     implementation("org.tensorflow:tensorflow-lite:${tflite_version}")
     implementation("org.tensorflow:tensorflow-lite-gpu:${tflite_version}")

From 06d2fdc3e9329cc3aa356f1a4e492867f3b76e87 Mon Sep 17 00:00:00 2001
From: "CaptainDario @ MBP M1" <daapplab@gmail.com>
Date: Sun, 11 Feb 2024 14:22:07 +0100
Subject: [PATCH 2/3] allow decoding tf strings

---
 lib/src/util/byte_conversion_utils.dart | 36 +++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/lib/src/util/byte_conversion_utils.dart b/lib/src/util/byte_conversion_utils.dart
index a52054e..db25d57 100644
--- a/lib/src/util/byte_conversion_utils.dart
+++ b/lib/src/util/byte_conversion_utils.dart
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import 'dart:convert';
+import 'dart:ffi';
 import 'dart:typed_data';
 
 import 'package:tflite_flutter/tflite_flutter.dart';
@@ -165,6 +167,37 @@ class ByteConversionUtils {
     );
   }
 
+  /// Decodes a TensorFlow string to a List<String>
+  static List<String> decodeTFStrings(Uint8List bytes){
+    /// The decoded string
+    List<String> decodedStrings = [];
+    /// get the first 32bit int representing num of strings
+    int numStrings = ByteData.view(bytes.sublist(0,sizeOf<Int32>()).buffer).getInt32(0, Endian.little);
+
+    /// parse subsequent string position and sizes
+    for(int s = 0; s < numStrings; s++){
+
+      // get current str index
+      int startIdx = ByteData.view(
+        bytes.sublist(
+          (1+s)*sizeOf<Int32>(),
+          (2+s)*sizeOf<Int32>()
+        )
+      .buffer).getInt32(0, Endian.little);
+      // get next str index, or in last case the ending byte position
+      int endIdx = ByteData.view(
+        bytes.sublist(
+          (2+s)*sizeOf<Int32>(),
+          (3+s)*sizeOf<Int32>()
+        )
+      .buffer).getInt32(0, Endian.little);
+      
+      decodedStrings.add(utf8.decode(bytes.sublist(startIdx,endIdx)));
+    }
+
+    return decodedStrings;
+  }
+
   static Object convertBytesToObject(
       Uint8List bytes, TensorType tensorType, List<int> shape) {
     // stores flattened data
@@ -209,6 +242,9 @@ class ByteConversionUtils {
         list.add(ByteData.view(bytes.buffer).getInt64(i));
       }
       return list.reshape<int>(shape);
+    } else if (tensorType.value == TfLiteType.kTfLiteString) {
+      list.add(decodeTFStrings(bytes));
+      return list;
     }
     throw UnsupportedError("$tensorType is not Supported.");
   }

From 7c292604eb3e6bf0a3354253f220a8a15cf97d6a Mon Sep 17 00:00:00 2001
From: "CaptainDario @ MBP M1" <daapplab@gmail.com>
Date: Sun, 11 Feb 2024 14:30:19 +0100
Subject: [PATCH 3/3] dart format

---
 lib/src/util/byte_conversion_utils.dart | 33 +++++++++++--------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/lib/src/util/byte_conversion_utils.dart b/lib/src/util/byte_conversion_utils.dart
index db25d57..2538c67 100644
--- a/lib/src/util/byte_conversion_utils.dart
+++ b/lib/src/util/byte_conversion_utils.dart
@@ -168,31 +168,28 @@ class ByteConversionUtils {
   }
 
   /// Decodes a TensorFlow string to a List<String>
-  static List<String> decodeTFStrings(Uint8List bytes){
+  static List<String> decodeTFStrings(Uint8List bytes) {
     /// The decoded string
     List<String> decodedStrings = [];
+
     /// get the first 32bit int representing num of strings
-    int numStrings = ByteData.view(bytes.sublist(0,sizeOf<Int32>()).buffer).getInt32(0, Endian.little);
+    int numStrings = ByteData.view(bytes.sublist(0, sizeOf<Int32>()).buffer)
+        .getInt32(0, Endian.little);
 
     /// parse subsequent string position and sizes
-    for(int s = 0; s < numStrings; s++){
-
+    for (int s = 0; s < numStrings; s++) {
       // get current str index
-      int startIdx = ByteData.view(
-        bytes.sublist(
-          (1+s)*sizeOf<Int32>(),
-          (2+s)*sizeOf<Int32>()
-        )
-      .buffer).getInt32(0, Endian.little);
+      int startIdx = ByteData.view(bytes
+              .sublist((1 + s) * sizeOf<Int32>(), (2 + s) * sizeOf<Int32>())
+              .buffer)
+          .getInt32(0, Endian.little);
       // get next str index, or in last case the ending byte position
-      int endIdx = ByteData.view(
-        bytes.sublist(
-          (2+s)*sizeOf<Int32>(),
-          (3+s)*sizeOf<Int32>()
-        )
-      .buffer).getInt32(0, Endian.little);
-      
-      decodedStrings.add(utf8.decode(bytes.sublist(startIdx,endIdx)));
+      int endIdx = ByteData.view(bytes
+              .sublist((2 + s) * sizeOf<Int32>(), (3 + s) * sizeOf<Int32>())
+              .buffer)
+          .getInt32(0, Endian.little);
+
+      decodedStrings.add(utf8.decode(bytes.sublist(startIdx, endIdx)));
     }
 
     return decodedStrings;