# readInto method

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

Reads into an existing List 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]);