From 6282bfd1c556e7e4ccfc50f68b0f8d1cb5c41a5e Mon Sep 17 00:00:00 2001
From: Christien Rioux <chris@veilid.org>
Date: Wed, 15 May 2024 21:20:39 -0400
Subject: [PATCH] add lengths to typedkey

---
 veilid-flutter/lib/veilid_crypto.dart   | 34 +++++++++++++++++++++++++
 veilid-flutter/lib/veilid_encoding.dart | 26 +++++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/veilid-flutter/lib/veilid_crypto.dart b/veilid-flutter/lib/veilid_crypto.dart
index 17ee4b5f..186d8e01 100644
--- a/veilid-flutter/lib/veilid_crypto.dart
+++ b/veilid-flutter/lib/veilid_crypto.dart
@@ -28,6 +28,9 @@ Uint8List cryptoKindToBytes(CryptoKind kind) {
   return b;
 }
 
+CryptoKind cryptoKindFromBytes(Uint8List b) =>
+    ByteData.sublistView(b).getUint32(0);
+
 CryptoKind cryptoKindFromString(String s) {
   if (s.codeUnits.length != 4) {
     throw const FormatException('malformed string');
@@ -53,6 +56,11 @@ class Typed<V extends EncodedString> extends Equatable {
     final value = EncodedString.fromString<V>(parts.sublist(1).join(':'));
     return Typed(kind: kind, value: value);
   }
+  factory Typed.fromBytes(Uint8List b) {
+    final kind = cryptoKindFromBytes(b);
+    final value = EncodedString.fromBytes<V>(b.sublist(4));
+    return Typed(kind: kind, value: value);
+  }
   factory Typed.fromJson(dynamic json) => Typed.fromString(json as String);
   final CryptoKind kind;
   final V value;
@@ -69,6 +77,32 @@ class Typed<V extends EncodedString> extends Equatable {
     return b.toBytes();
   }
 
+  static int encodedLength<X>() {
+    switch (X) {
+      case const (Typed<FixedEncodedString32>):
+        return FixedEncodedString32.encodedLength() + 5;
+      case const (Typed<FixedEncodedString43>):
+        return FixedEncodedString43.encodedLength() + 5;
+      case const (Typed<FixedEncodedString86>):
+        return FixedEncodedString86.encodedLength() + 5;
+      default:
+        throw UnimplementedError();
+    }
+  }
+
+  static int decodedLength<X>() {
+    switch (X) {
+      case const (Typed<FixedEncodedString32>):
+        return FixedEncodedString32.decodedLength() + 4;
+      case const (Typed<FixedEncodedString43>):
+        return FixedEncodedString43.decodedLength() + 4;
+      case const (Typed<FixedEncodedString86>):
+        return FixedEncodedString86.decodedLength() + 4;
+      default:
+        throw UnimplementedError();
+    }
+  }
+
   String toJson() => toString();
 }
 
diff --git a/veilid-flutter/lib/veilid_encoding.dart b/veilid-flutter/lib/veilid_encoding.dart
index 5022bd84..4cde365a 100644
--- a/veilid-flutter/lib/veilid_encoding.dart
+++ b/veilid-flutter/lib/veilid_encoding.dart
@@ -52,6 +52,32 @@ abstract class EncodedString extends Equatable {
   @override
   String toString() => contents;
 
+  static int encodedLength<T extends EncodedString>() {
+    switch (T) {
+      case FixedEncodedString32:
+        return FixedEncodedString32.encodedLength();
+      case FixedEncodedString43:
+        return FixedEncodedString43.encodedLength();
+      case FixedEncodedString86:
+        return FixedEncodedString86.encodedLength();
+      default:
+        throw UnimplementedError();
+    }
+  }
+
+  static int decodedLength<T extends EncodedString>() {
+    switch (T) {
+      case FixedEncodedString32:
+        return FixedEncodedString32.decodedLength();
+      case FixedEncodedString43:
+        return FixedEncodedString43.decodedLength();
+      case FixedEncodedString86:
+        return FixedEncodedString86.decodedLength();
+      default:
+        throw UnimplementedError();
+    }
+  }
+
   static T fromBytes<T extends EncodedString>(Uint8List bytes) {
     switch (T) {
       case FixedEncodedString32: