https://github.com/puredarwin/hfsplus_efi

Open Source HFSPlus EFI file built under EDKII
https://github.com/puredarwin/hfsplus_efi

Last synced: 4 months ago
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Open Source HFSPlus EFI file built under EDKII

• Host: GitHub
• URL: https://github.com/puredarwin/hfsplus_efi
• Owner: PureDarwin
• License: other
• Created: 2024-08-25T19:30:49.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-08-25T19:45:12.000Z (almost 2 years ago)
• Last Synced: 2024-08-25T20:49:54.569Z (almost 2 years ago)
• Language: C
• Size: 16.6 KB
• Stars: 0
• Watchers: 7
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

          
# 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.