CODEWITHSUNDEEP
dartcopybytebuffer
Joe Lapp
Joe Lapp

Reputation: 2965

Fast copy ByteBuffer into ByteBuffer in Dart

How do I perform a fast copy of the bytes of a ByteBuffer into another larger ByteBuffer (at non-zero offset) in Dart?

There are slow ways to do this. One is to cast each to a Uint8List and copy over one index at a time. Another is to cast into each into a Uint8List, get an iterator for the first, and call setRange() on the second.

I'm thinking there ought to be a more direct way that asks the Dart API to speedily copy a byte sequence from one buffer to the other. The API can natively optimize this copy. If not, what's the fastest way to do this?

Upvotes: 6

Views: 393

Answers (1)

Ivo Skalický
Ivo Skalický

Reputation: 318

Try this, it should be faster than copy Uint8List value by value for larger dataset.

        String url = Url.createObjectUrlFromBlob(new Blob([srcBuffer]));
        ByteBuffer dstBuffer = (await HttpRequest.request(url, responseType: 'arraybuffer')).response;
        Url.revokeObjectUrl(url);

Upvotes: 1

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