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

Reads into an existing List<int> from the socket into the range: [start,end).

Reads into an existing List<int> from the socket. If start is present, the bytes will be filled into buffer from index start, otherwise index

  1. If end is present, end - start bytes will be read into buffer,otherwise up to buffer.length. If end == start, no bytes are read.Returns the number of bytes read.

Source 

int readIntoSync(List<int> buffer, [int start = 0, int end]);