SGA

What is SGA? SGA is a file format used by Relic games studio for many of their games. This library helps to parse and extract those files for viewing.

Installation

To install just run cargo add sga or add the following to your Cargo.toml

[dependencies]
sga = "0.1"

Usage

To unpack to a specified destination, just use the extract_all function.

use sga::extract_all;

fn main() {
    extract_all("./ArtJapanese.sga", "./ArtJapanese").unwrap();
}

If you wish to do something more elaborate, for example only extracting the first folder and files from the table_of_contents, it is possible to construct the file tree, and then write it to disk.

pub fn extract_toc_folders_only<P: AsRef<Path>>(sga_file: P, out_path: P) -> anyhow::Result<()> {
    // open the file as a buffer
    let mut sga_file = BufReader::new(File::open(sga_file)?);

    // construct the entries from the buffer.
    // contains header, files, folders, and table_of_contents information
    let mut entries = SgaEntries::new(&mut sga_file)?;
    // Just take out the table of contents entries, and replace the taken with an empty vec.
    let toc_entries = std::mem::replace(&mut entries.tocs, Vec::new());
    // Create a new Toc from those entries
    let tocs: Vec<_> = toc_entries
        .into_iter()
        .map(|toc| Toc::initialize_from_entry(&mut sga_file, &entries, toc).unwrap())
        .collect();

    // loop over the tocs
    for toc in tocs {
        // Clone folder for more use.
        let folder = toc.root_folder.clone();
        // read all files from the folder
        let files = FolderNode::read_files_from_folder(folder.clone(), &mut sga_file, &entries)?;
    
        // add all those files into the folder
        for file in files {
            let file = Arc::new(file);
            folder.lock().unwrap().add_child(Node::File(file));
        }

        // write the entire folder to the disk
        write_to_disk(&mut sga_file, folder, &out_path)?;
    }

    Ok(())
}