HFS+ UEFI File System Operations

Overview

This project implements HFS+ file system operations within a UEFI application built on the EDKII Enviorment. The application includes the ability to:

• Read and write files using HFS+ file structures (including support for fragmented files) and journaled file systems.
• Traverse the HFS+ catalog B-tree to locate files and directories.
• Find and load boot.efi from a system drive formatted in HFS+, typically located at /System/Library/CoreServices/boot.efi.

Features

1. HFS+ File System Support:

   • Reading and writing of files in HFS+ volumes.
   • Handling of fragmented files using the HFS+ extent overflow file.

2. Catalog B-tree Traversal:

   • Parsing and traversal of the HFS+ catalog B-tree to locate files and directories.
   • Support for reading metadata to identify files such as boot.efi.

3. Boot.efi Loading:

   • Locates boot.efi in the /System/Library/CoreServices directory of an HFS+ system drive.
   • Loads the contents of boot.efi for potential execution by the UEFI firmware.

Project Structure

• HFSPlusFileOps.h/c: Implements the core HFS+ file system logic, including file reading, writing, and catalog B-tree traversal.
• MockBlockIo.h/c: Provides a mock block I/O protocol for simulating disk read and write operations, useful for testing.
• TestLargeFile.c: Contains test cases to validate file read and write operations, as well as the process for locating boot.efi.
• HfsPlusFileOpsTest.inf: The build configuration file for EDK II, describing the application's source files, dependencies, and build settings.

Building the Application

To build this UEFI application use the EDK II build environment.

This code is experimental and should be used with caution.

Copyright (c) 2007-Present The PureDarwin Project.

All rights reserved.