(https://github.com/ruby/fiddle/pull/123)
This commit adds two new methods, `Fiddle::Pointer.read` and
`Fiddle::Pointer.write`. Both methods take an address, and will read or
write bytes at that address respectively.
For example we can read from an address without making a Pointer object:
```ruby
Fiddle::Pointer.read(address, 5) # read 5 bytes
```
We can also write to an address without allocating a Pointer object:
```ruby
Fiddle::Pointer.write(address, "bytes") # write 5 bytes
```
This allows us to read / write memory at arbitrary addresses without
instantiating a new `Fiddle::Pointer` object.
Examples where this API would be useful
[1](https://github.com/tenderlove/tenderjit/blob/f03481d28bff4d248746e596929b0841de65f181/lib/tenderjit/fiddle_hacks.rb#L26-L28)
[2](https://github.com/tenderlove/ruby/blob/77c8daa2d40dd58eeb3785ce17dea2ee38f308d1/lib/ruby_vm/rjit/c_pointer.rb#L193)
[3](https://github.com/tenderlove/ruby/blob/77c8daa2d40dd58eeb3785ce17dea2ee38f308d1/lib/ruby_vm/rjit/c_pointer.rb#L284)
I also added a writer method for the same reasons as the reader.
---------
https://github.com/ruby/fiddle/commit/04238cefed
Co-authored-by: Sutou Kouhei <kou@clear-code.com>