The core-avr-io library provides various objects and abstractions that are useful for IO on AVR.
AvrStream is the interface for reading and writing bytes. The naming convention is to avoid naming collisions with various standard library streams.
When the need arises to manipulate a fixed size memory buffer, MemoryStream provides a reliable implementation. We provide thorough testing in the test/ directory.
The EEPROMStream is one of the more complicated implementations. It covers up the morass of dealing with EEPROM through the DataFlash library. Paging is taken care of behind the scenes.