Filesystem File I/O

Modules
	Filesystem File Producers
	Filesystem File Consumers

Detailed Description

Adapters for using low-level FSFile handles as stream buffer producers and consumers.

These functions provide convenient ways to read from or write to filesystem files using the stream buffer abstraction, supporting both push and pull modes.

Producer (Input) Functions:

• sbufFSFileIn() - Read entire file contents into stream buffer
• sbufFSFilePRegisterPull() - Register filesystem file as pull-mode producer

Consumer (Output) Functions:

• sbufFSFileOut() - Write all stream buffer data to filesystem file
• sbufFSFileCRegisterPush() - Register filesystem file as push-mode consumer

Note: For VFS (Virtual File System) operations, use the functions in sbfile.h instead. FSFile provides direct low-level filesystem access.