fn copyRangeAll(in: File, in_offset: u64, out: File, out_offset: u64, len: u64) CopyRangeError!u64

Returns the number of bytes copied. If the number read is smaller than buffer.len, it means the in file reached the end. Reaching the end of a file is not an error condition.

Parameters

in: File,
in_offset: u64,
out: File,
out_offset: u64,
len: u64,