mirror of
https://github.com/kodjodevf/mangayomi.git
synced 2026-03-11 17:25:32 +00:00
75 lines
2.2 KiB
Rust
75 lines
2.2 KiB
Rust
//! Functions that support auto-generated Rust code.
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//! These functions are *not* meant to be used by humans directly.
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#![doc(hidden)]
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use std::mem;
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pub use crate::bridge::bridge_engine::ffi::*;
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pub use lazy_static::lazy_static;
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pub use crate::bridge::bridge_engine::handler::DefaultHandler;
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// ref https://stackoverflow.com/questions/39224904/how-to-expose-a-rust-vect-to-ffi
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pub fn new_leak_vec_ptr<T: Clone>(fill: T, length: i32) -> *mut T {
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into_leak_vec_ptr(vec![fill; length as usize]).0
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}
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pub fn into_leak_vec_ptr<T: Clone>(mut v: Vec<T>) -> (*mut T, i32) {
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v.shrink_to_fit();
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assert!(v.len() == v.capacity());
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let ptr = v.as_mut_ptr();
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let len = v.len() as i32;
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mem::forget(v);
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(ptr, len)
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}
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/// # Safety
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/// Use it in pair with [new_leak_vec_ptr].
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pub unsafe fn vec_from_leak_ptr<T>(ptr: *mut T, len: i32) -> Vec<T> {
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Vec::from_raw_parts(ptr, len as usize, len as usize)
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}
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/// Convert [Vec<T>] to array length `N`.
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///
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/// # Panics
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///
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/// Panics if length of [Vec<T>] != `N`.
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pub fn from_vec_to_array<T, const N: usize>(v: Vec<T>) -> [T; N] {
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core::convert::TryInto::try_into(v)
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.unwrap_or_else(|v: Vec<T>| panic!("Expected a Vec of length {} but it was {}", N, v.len()))
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}
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// ref: doc of [Box::into_raw]
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pub fn new_leak_box_ptr<T>(t: T) -> *mut T {
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let x: Box<T> = Box::new(t);
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Box::into_raw(x)
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}
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/// # Safety
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/// Use it in pair with [new_leak_box_ptr].
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pub unsafe fn box_from_leak_ptr<T>(ptr: *mut T) -> Box<T> {
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Box::from_raw(ptr)
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}
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/// Cast a byte buffer into a boxed slice of the target type without making any copies.
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/// Panics if the cast fails.
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pub fn slice_from_byte_buffer<T: bytemuck::Pod>(buffer: Vec<u8>) -> Box<[T]> {
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let buf = Box::leak(buffer.into_boxed_slice());
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match bytemuck::try_cast_slice_mut(buf) {
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Ok(buf) => unsafe { Box::from_raw(buf) },
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Err(err) => {
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// clean up before panicking
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unsafe { core::ptr::drop_in_place(buf) }
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panic!("cast error: {}", err);
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}
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}
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}
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#[cfg(not(target_family = "wasm"))]
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use allo_isolate::ffi::DartCObject;
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#[cfg(not(target_family = "wasm"))]
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pub type WireSyncReturn = *mut DartCObject;
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#[cfg(target_family = "wasm")]
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pub type WireSyncReturn = wasm_bindgen::JsValue;
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