rssn 0.2.9

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
Documentation 
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//! Bincode-based FFI API for numerical equation solvers.

use serde::Deserialize;
use serde::Serialize;

use crate::ffi_apis::common::BincodeBuffer;
use crate::numerical::matrix::Matrix;
use crate::numerical::solve::LinearSolution;
use crate::numerical::solve::{
    self,
};

#[derive(Deserialize)]
struct SolveLinearInput {
    matrix: Matrix<f64>,
    vector: Vec<f64>,
}

#[derive(Serialize)]
struct FfiResult<T> {
    ok: Option<T>,
    err: Option<String>,
}

pub(crate) fn decode<T: for<'de> Deserialize<'de>>(buffer: BincodeBuffer) -> Option<T> {
    let slice = unsafe { buffer.as_slice() };

    bincode_next::serde::decode_from_slice(slice, bincode_next::config::standard())
        .ok()
        .map(|(v, _)| v)
}

fn encode<T: Serialize>(val: T) -> BincodeBuffer {
    match bincode_next::serde::encode_to_vec(&val, bincode_next::config::standard()) {
        | Ok(bytes) => BincodeBuffer::from_vec(bytes),
        | Err(_) => BincodeBuffer::empty(),
    }
}

/// Bincode FFI for solving linear systems.
///
/// # 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_solve_linear_system_bincode(buffer: BincodeBuffer) -> BincodeBuffer {
    let input: SolveLinearInput = match decode(buffer) {
        | Some(v) => v,
        | None => {
            return encode(FfiResult::<LinearSolution> {
                ok: None,
                err: Some("Bincode decode error".to_string()),
            });
        },
    };

    match solve::solve_linear_system(&input.matrix, &input.vector) {
        | Ok(sol) => {
            encode(FfiResult {
                ok: Some(sol),
                err: None::<String>,
            })
        },
        | Err(e) => {
            encode(FfiResult::<LinearSolution> {
                ok: None,
                err: Some(e),
            })
        },
    }
}