Krys4lide/crates/fsv-sys/src/lib.rs

#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]

pub mod BINDINGS {
    include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
}

// We need to keep the this use statement to get `ssv_function` macro working well
use BINDINGS::*;

/// Macro to generate a function that implements a call to an external function in BINDINGS
macro_rules! ssv_function {
    ($binding:ty, $func_name:ident, {$($arg_name:ident: $arg_type:ty),*}) => {
        /// # Safety
        /// This function is unsafe because it calls an external function through FFI.
        /// The caller must ensure that the provided arguments are valid and that the
        /// external function is safe to call.
        pub unsafe fn $func_name(&self, $($arg_name: $arg_type),*) -> Result<u16, Error> {
            let func_struct: libloading::Symbol<'_, $binding> =
                unsafe { self.library.get(stringify!($binding).as_bytes())? };
            let func = match *func_struct {
                Some(func) => func,
                None => return Err(Error::SymbolMissing(stringify!($binding))),
            };
            Ok(func($($arg_name),*))
        }
    };
}

#[derive(thiserror::Error, Debug)]
pub enum Error {
    #[error(transparent)]
    LibLoading(#[from] libloading::Error),
    #[error("Symbol missing: {0}")]
    SymbolMissing(&'static str),
}

/// Wrapper around the SESAM-VITALE library
/// This struct is responsible for loading the library and providing an interface to call its functions.
/// The library is loaded at creation and kept in memory until the struct is dropped.
#[derive(Debug)]
pub struct SSVLibrary {
    library: libloading::Library,
}

pub fn get_library_path() -> String {
    // TODO : Use libloading::library_filename to get platform-specific filename ?
    "/opt/santesocial/fsv/1.40.13/lib/libssvlux64.so".to_string()
}

impl SSVLibrary {
    pub fn new(library_path: &str) -> Result<Self, Error> {
        let library = unsafe { libloading::Library::new(library_path)? };
        Ok(SSVLibrary { library })
    }

    pub fn library(&self) -> &libloading::Library {
        &self.library
    }

    ssv_function!(SSV_InitLIB2, ssv_init_lib2, {
        pcFichierSesam: *const i8
    });
    
    ssv_function!(SSV_LireConfig, ssv_lire_config, {
        pZDataOut: *mut *mut libc::c_void,
        psTailleDataOut: *mut usize
    });

    ssv_function!(SSV_LireCartePS, ssv_lire_carte_ps, {
        NomRessourcePS: *const i8,
        NomRessourceLecteur: *const i8,
        CodePorteurPS: *const i8,
        pZDataOut: *mut *mut libc::c_void,
        pTailleZone: *mut usize
    });
}

#[cfg(test)]
mod test {
    use std::{ffi::CString, ptr};

    use super::*;         

    #[test]
    fn test_initlib2() {
        let library_path = get_library_path();
        let ssv_library = SSVLibrary::new(&library_path).expect("SSVLibrary::new failed");

        let sesam_ini_str = CString::new("/etc/opt/santesocial/fsv/1.40.13/conf/sesam.ini")
            .expect("CString::new failed");
        let result = unsafe { ssv_library.ssv_init_lib2(sesam_ini_str.as_ptr()) }.unwrap();
        assert_eq!(result, 0);
    }

    #[test]
    fn test_lire_config_and_carte_ps() {
        let library_path = get_library_path();
        let ssv_library = SSVLibrary::new(&library_path).expect("SSVLibrary::new failed");

        let sesam_ini_str = CString::new("/etc/opt/santesocial/fsv/1.40.13/conf/sesam.ini")
            .expect("CString::new failed");
        let result = unsafe { ssv_library.ssv_init_lib2(sesam_ini_str.as_ptr()) }.unwrap();
        assert_eq!(result, 0);

        let mut buffer_ptr: *mut libc::c_void = ptr::null_mut();
        let mut size: libc::size_t = 0;
        let result = unsafe { ssv_library.ssv_lire_config(&mut buffer_ptr, &mut size) }.unwrap();
        assert_eq!(result, 0);

        let nom_ressource_ps = CString::new("Gemalto PC Twin Reader (645D94C3) 00 00")
            .expect("CString::new failed");
        let nom_ressource_lecteur = CString::new("Gemalto PC Twin Reader (645D94C3) 00 00")
            .expect("CString::new failed");
        let code_porteur_ps = CString::new("1234").expect("CString::new failed");
        let mut buffer_ptr: *mut libc::c_void = ptr::null_mut();
        let mut size: libc::size_t = 0;
        let result = unsafe {
            ssv_library.ssv_lire_carte_ps(
                nom_ressource_ps.as_ptr(),
                nom_ressource_lecteur.as_ptr(),
                code_porteur_ps.as_ptr(),
                &mut buffer_ptr,
                &mut size,
            )
        }.unwrap();
        assert_eq!(result, 0);
    }
}