Well, I guess the difference in data block I/O semantics can be
abstracted. For example `fread` is just `read` with an additional
parameter. In particular
fread(buffer,1,N,stream) <=> read(fd,buffer,N)
It is harder if some file format requires `seek`, and underlying I/O
system does not support such operations. The solution is to let
`nullptr` denote that the I/O system does not support this operation. If
the file format requires `seek` (TIFF and OpenEXR does, but PNG does
not), and the user sets it to `nullptr`, there are two options: 1) Copy
data to temporary storage, and process it further from there. 2) Fail.
Or what happens if I `TIFFOpen("/dev/stdin","r")`.
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