markSupported method

Tests if this input stream supports the mark and reset methods.

Whether or not mark and reset are supported is an invariant property of a particular input stream instance. The markSupported method returns true if and only if this stream supports the mark/reset functionality.

Returns

true if this stream instance supports the mark and reset methods; false otherwise.

Example

final input = FileInputStream('data.txt');
if (input.markSupported()) {
  input.mark(1024); // Mark current position
  
  // Read some data
  final preview = await input.readFully(100);
  
  // Reset to marked position
  await input.reset();
  
  // Read again from the marked position
  final actualData = await input.readAll();
}