Add Piece writes more than needed

[ortyomka]

Description

If we transfer a file with size N to add_piece and ask to write M bytes (where N > M)

Then the function will write N bytes. It seems like overkill.

I think add_piece should write M bytes only

Acceptance criteria

add_piece function writes piece_size bytes

Risks + pitfalls

If you pass /dev/zero file, then the copy will be infinite.

Where to begin

Here