unity-native-plugin 0.9.0

Unity Native Plugin API for Rust
Documentation 
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use crate::interface::UnityInterface;
use std::ffi::{CStr, c_void};

define_unity_interface!(
    UnityMemoryManager,
    unity_native_plugin_sys::IUnityMemoryManager,
    0xBAF9E57C61A811EC_u64,
    0xC5A7CC7861A811EC_u64
);

pub trait UnityMemoryManagerInterface {
    /// # Safety
    /// `area_name` and `object_name` must remain valid for the lifetime of the
    /// returned [`UnityAllocator`].
    unsafe fn create_allocator(
        &self,
        area_name: &CStr,
        object_name: &CStr,
    ) -> Option<UnityAllocator>;
}

pub use UnityMemoryManagerInterface as IUnityMemoryManager;

pub struct UnityAllocator {
    allocator: *mut unity_native_plugin_sys::UnityAllocator,
    memory_manager: UnityMemoryManager,
}

impl Drop for UnityAllocator {
    fn drop(&mut self) {
        unsafe {
            self.memory_manager.destroy_allocator(self.allocator);
        }
    }
}

impl UnityAllocator {
    pub unsafe fn allocate(
        &self,
        size: usize,
        align: usize,
        file: &CStr,
        line: i32,
    ) -> *mut c_void {
        unsafe {
            self.memory_manager
                .allocate(self.allocator, size, align, file, line)
        }
    }

    pub unsafe fn deallocate(&self, ptr: *mut c_void, file: &CStr, line: i32) {
        unsafe {
            self.memory_manager
                .deallocate(self.allocator, ptr, file, line)
        }
    }

    pub unsafe fn reallocate(
        &self,
        ptr: *mut c_void,
        size: usize,
        align: usize,
        file: &CStr,
        line: i32,
    ) -> *mut c_void {
        unsafe {
            self.memory_manager
                .reallocate(self.allocator, ptr, size, align, file, line)
        }
    }
}

impl UnityMemoryManagerInterface for UnityMemoryManager {
    unsafe fn create_allocator(
        &self,
        area_name: &CStr,
        object_name: &CStr,
    ) -> Option<UnityAllocator> {
        unsafe {
            let allocator = self.interface().CreateAllocator.expect("CreateAllocator")(
                area_name.as_ptr(),
                object_name.as_ptr(),
            );
            if !allocator.is_null() {
                Some(UnityAllocator {
                    allocator,
                    memory_manager: *self,
                })
            } else {
                None
            }
        }
    }
}

impl UnityMemoryManager {
    pub(crate) unsafe fn destroy_allocator(
        &self,
        allocator: *mut unity_native_plugin_sys::UnityAllocator,
    ) {
        unsafe { self.interface().DestroyAllocator.expect("DestroyAllocator")(allocator) }
    }

    pub(crate) unsafe fn allocate(
        &self,
        allocator: *mut unity_native_plugin_sys::UnityAllocator,
        size: usize,
        align: usize,
        file: &CStr,
        line: i32,
    ) -> *mut c_void {
        unsafe {
            self.interface().Allocate.expect("Allocate")(
                allocator,
                size,
                align,
                file.as_ptr(),
                line,
            )
        }
    }

    pub(crate) unsafe fn deallocate(
        &self,
        allocator: *mut unity_native_plugin_sys::UnityAllocator,
        ptr: *mut c_void,
        file: &CStr,
        line: i32,
    ) {
        unsafe {
            self.interface().Deallocate.expect("Deallocate")(allocator, ptr, file.as_ptr(), line)
        }
    }

    pub(crate) unsafe fn reallocate(
        &self,
        allocator: *mut unity_native_plugin_sys::UnityAllocator,
        ptr: *mut c_void,
        size: usize,
        align: usize,
        file: &CStr,
        line: i32,
    ) -> *mut c_void {
        unsafe {
            self.interface().Reallocate.expect("Reallocate")(
                allocator,
                ptr,
                size,
                align,
                file.as_ptr(),
                line,
            )
        }
    }
}