rssn 0.2.9

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
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//! Handle-based FFI API for electromagnetism functions.

use std::ffi::CStr;
use std::os::raw::c_char;

use crate::symbolic::core::Expr;
use crate::symbolic::electromagnetism;
use crate::symbolic::vector::Vector;

/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
unsafe fn c_str_to_str<'a>(s: *const c_char) -> Option<&'a str> {
    unsafe {
        if s.is_null() {
            None
        } else {
            CStr::from_ptr(s).to_str().ok()
        }
    }
}

/// Calculates the Lorentz force.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_lorentz_force(
    charge: *const Expr,
    e_field: *const Vector,
    velocity: *const Vector,
    b_field: *const Vector,
) -> *mut Vector {
    unsafe {
        if charge.is_null() || e_field.is_null() || velocity.is_null() || b_field.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(electromagnetism::lorentz_force(
            &*charge, &*e_field, &*velocity, &*b_field,
        )))
    }
}

/// Calculates the Poynting vector.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_poynting_vector(
    e_field: *const Vector,
    b_field: *const Vector,
) -> *mut Vector {
    unsafe {
        if e_field.is_null() || b_field.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(electromagnetism::poynting_vector(
            &*e_field, &*b_field,
        )))
    }
}

/// Calculates energy density.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_electromagnetic_energy_density(
    e_field: *const Vector,
    b_field: *const Vector,
) -> *mut Expr {
    unsafe {
        if e_field.is_null() || b_field.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(electromagnetism::energy_density(
            &*e_field, &*b_field,
        )))
    }
}

/// Computes magnetic field from vector potential.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_magnetic_field_from_vector_potential(
    a: *const Vector,
    x: *const c_char,
    y: *const c_char,
    z: *const c_char,
) -> *mut Vector {
    unsafe {
        if a.is_null() || x.is_null() || y.is_null() || z.is_null() {
            return std::ptr::null_mut();
        }

        let xs = match c_str_to_str(x) {
            | Some(s) => s,
            | None => return std::ptr::null_mut(),
        };

        let ys = match c_str_to_str(y) {
            | Some(s) => s,
            | None => return std::ptr::null_mut(),
        };

        let zs = match c_str_to_str(z) {
            | Some(s) => s,
            | None => return std::ptr::null_mut(),
        };

        Box::into_raw(Box::new(
            electromagnetism::magnetic_field_from_vector_potential(&*a, (xs, ys, zs)),
        ))
    }
}

/// Computes electric field from scalar and vector potentials.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_electric_field_from_potentials(
    v: *const Expr,
    a: *const Vector,
    x: *const c_char,
    y: *const c_char,
    z: *const c_char,
    t: *const c_char,
) -> *mut Vector {
    unsafe {
        if v.is_null() || a.is_null() || x.is_null() || y.is_null() || z.is_null() || t.is_null() {
            return std::ptr::null_mut();
        }

        let xs = match c_str_to_str(x) {
            | Some(s) => s,
            | None => return std::ptr::null_mut(),
        };

        let ys = match c_str_to_str(y) {
            | Some(s) => s,
            | None => return std::ptr::null_mut(),
        };

        let zs = match c_str_to_str(z) {
            | Some(s) => s,
            | None => return std::ptr::null_mut(),
        };

        let ts = match c_str_to_str(t) {
            | Some(s) => s,
            | None => return std::ptr::null_mut(),
        };

        Box::into_raw(Box::new(electromagnetism::electric_field_from_potentials(
            &*v,
            &*a,
            (xs, ys, zs),
            ts,
        )))
    }
}

/// Calculates Coulomb's Law field.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_coulombs_law(
    charge: *const Expr,
    r: *const Vector,
) -> *mut Vector {
    unsafe {
        if charge.is_null() || r.is_null() {
            return std::ptr::null_mut();
        }

        Box::into_raw(Box::new(electromagnetism::coulombs_law(&*charge, &*r)))
    }
}