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add lengths to typedkey

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This commit is contained in:
Christien Rioux 2024-05-15 21:20:39 -04:00
parent 81134bad67
commit 6282bfd1c5
2 changed files with 60 additions and 0 deletions
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34
veilid-flutter/lib/veilid_crypto.dart
View file

@ -28,6 +28,9 @@ Uint8List cryptoKindToBytes(CryptoKind kind) {
return b; return b;
} }
CryptoKind cryptoKindFromBytes(Uint8List b) =>
ByteData.sublistView(b).getUint32(0);
CryptoKind cryptoKindFromString(String s) { CryptoKind cryptoKindFromString(String s) {
if (s.codeUnits.length != 4) { if (s.codeUnits.length != 4) {
throw const FormatException('malformed string'); 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(':')); final value = EncodedString.fromString<V>(parts.sublist(1).join(':'));
return Typed(kind: kind, value: value); 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); factory Typed.fromJson(dynamic json) => Typed.fromString(json as String);
final CryptoKind kind; final CryptoKind kind;
final V value; final V value;
@ -69,6 +77,32 @@ class Typed<V extends EncodedString> extends Equatable {
return b.toBytes(); 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(); String toJson() => toString();
} }

26
veilid-flutter/lib/veilid_encoding.dart
View file

@ -52,6 +52,32 @@ abstract class EncodedString extends Equatable {
@override @override
String toString() => contents; 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) { static T fromBytes<T extends EncodedString>(Uint8List bytes) {
switch (T) { switch (T) {
case FixedEncodedString32: case FixedEncodedString32: