[dart-misc] How to make fast convert String(UTF16)->UTF8(UInt8List). UInt8List -> String(UTF16)?

[Игорь Демьянов]

I'm ported node_redis to Dart language. https://github.com/DisDis/dart_redis
I found big problem. Redis uses UTF8, Dart uses UTF16.
I used "UTF8.decode" for convert input socket data.
String bufferToString(List<int> data) => UTF8.decode(data);
But that is bad performance(lose 56%).

How to set/get internal byte(0-255) list of string?

P.S.: string.codeUnits return int(0-65535) list.

['Anders Johnsen ' via Dart Misc]

Hi,

To convert between String and UTF8 encoded bytes, you should use:

UTF8.decode(List<int> bytes) / UTF8.encode(String string)

from the 'dart:convert' library, as you correctly do.

On the server-side, UTF8.decode will in most cases return a Uint8List while
in the browser a List<int>. This is because we are still supporting
browsers, where typed data is not implemented.

Do you have an example where you see this slow performance, as it may be an
unoptimized case in our converters?

Cheers,

- Anders

Post by Игорь Демьянов
I'm ported node_redis to Dart language.
https://github.com/DisDis/dart_redis
I found big problem. Redis uses UTF8, Dart uses UTF16.
I used "UTF8.decode" for convert input socket data.
String bufferToString(List<int> data) => UTF8.decode(data);
But that is bad performance(lose 56%).
How to set/get internal byte(0-255) list of string?
P.S.: string.codeUnits return int(0-65535) list.
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