description

# readInto method Null safety

Future<int> readInto (

1. List<int> buffer,
2. [int start = 0,
3. int? end]

)

Reads into an existing List<int> from the file. If `start` is present, the bytes will be filled into `buffer` from at index `start`, otherwise index 0. If `end` is present, the `end` - `start` bytes will be read into `buffer`, otherwise up to `buffer.length`. If `end` == `start` nothing happens.

Returns a `Future<int>` that completes with the number of bytes read.

## Implementation

    Future<int> readInto(List<int> buffer, [int start = 0, int? end]);