Uint8List.view constructor

Uint8List.view(ByteBuffer buffer, [ int offsetInBytes = 0 int length ])

Creates a Uint8List view of the specified region in buffer.

Changes in the Uint8List will be visible in the byte buffer and vice versa. If the offsetInBytes index of the region is not specified, it defaults to zero (the first byte in the byte buffer). If the length is not specified, it defaults to null, which indicates that the view extends to the end of the byte buffer.

Throws RangeError if offsetInBytes or length are negative, or if offsetInBytes + (length * elementSizeInBytes) is greater than the length of buffer.

Note that when creating a view from a TypedData list or byte data, that list or byte data may itself be a view on a larger buffer with a TypedData.offsetInBytes greater than zero. Merely doing Uint8List.view(other.buffer, 0, count) may not point to the bytes you intended. Instead you may need to do:

Uint8List.view(other.buffer, other.offsetInBytes, count)

Alternatively, use Uint8List.sublistView which includes this computation.

Uint8List.sublistView(other, 0, count)

(The third argument is an end index rather than a length, so if you start from a position greater than zero, you need not reduce the count correspondingly).

Implementation

factory Uint8List.view(ByteBuffer buffer,
    [int offsetInBytes = 0, int length]) {
  return buffer.asUint8List(offsetInBytes, length);
}