158 lines
3.9 KiB
Rust
158 lines
3.9 KiB
Rust
use crate::{heap_drop, heap_move, heap_move_nonnull, heap_remove, ByteSlice};
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use servicepoint::{
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Cp437Grid, Cp437GridCommand, DataRef, Grid, Origin, Packet,
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};
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use std::ptr::NonNull;
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/// Creates a new [Cp437Grid] with the specified dimensions.
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///
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/// returns: [Cp437Grid] initialized to 0.
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_new(
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width: usize,
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height: usize,
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) -> NonNull<Cp437Grid> {
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heap_move_nonnull(Cp437Grid::new(width, height))
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}
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/// Loads a [Cp437Grid] with the specified dimensions from the provided data.
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_load(
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width: usize,
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height: usize,
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data: ByteSlice,
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) -> *mut Cp437Grid {
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let data = unsafe { data.as_slice() };
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let grid = Cp437Grid::load(width, height, data);
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if let Some(grid) = grid {
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heap_move(grid)
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} else {
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std::ptr::null_mut()
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}
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}
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/// Clones a [Cp437Grid].
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_clone(
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cp437_grid: NonNull<Cp437Grid>,
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) -> NonNull<Cp437Grid> {
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heap_move_nonnull(unsafe { cp437_grid.as_ref().clone() })
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}
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/// Deallocates a [Cp437Grid].
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_free(cp437_grid: NonNull<Cp437Grid>) {
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unsafe { heap_drop(cp437_grid) }
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}
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/// Gets the current value at the specified position.
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///
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/// # Arguments
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///
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/// - `cp437_grid`: instance to read from
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/// - `x` and `y`: position of the cell to read
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///
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/// # Panics
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///
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/// - when accessing `x` or `y` out of bounds
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_get(
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cp437_grid: NonNull<Cp437Grid>,
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x: usize,
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y: usize,
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) -> u8 {
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unsafe { cp437_grid.as_ref().get(x, y) }
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}
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/// Sets the value of the specified position in the [Cp437Grid].
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///
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/// # Arguments
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///
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/// - `cp437_grid`: instance to write to
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/// - `x` and `y`: position of the cell
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/// - `value`: the value to write to the cell
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///
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/// returns: old value of the cell
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///
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/// # Panics
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///
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/// - when accessing `x` or `y` out of bounds
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_set(
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cp437_grid: NonNull<Cp437Grid>,
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x: usize,
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y: usize,
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value: u8,
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) {
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unsafe { (*cp437_grid.as_ptr()).set(x, y, value) };
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}
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/// Sets the value of all cells in the [Cp437Grid].
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///
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/// # Arguments
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///
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/// - `cp437_grid`: instance to write to
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/// - `value`: the value to set all cells to
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_fill(
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cp437_grid: NonNull<Cp437Grid>,
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value: u8,
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) {
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unsafe { (*cp437_grid.as_ptr()).fill(value) };
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}
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/// Gets the width of the [Cp437Grid] instance.
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///
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/// # Arguments
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///
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/// - `cp437_grid`: instance to read from
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_width(
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cp437_grid: NonNull<Cp437Grid>,
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) -> usize {
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unsafe { cp437_grid.as_ref().width() }
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}
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/// Gets the height of the [Cp437Grid] instance.
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///
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/// # Arguments
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///
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/// - `cp437_grid`: instance to read from
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_height(
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cp437_grid: NonNull<Cp437Grid>,
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) -> usize {
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unsafe { cp437_grid.as_ref().height() }
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}
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/// Gets an unsafe reference to the data of the [Cp437Grid] instance.
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///
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/// The returned memory is valid for the lifetime of the grid.
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_unsafe_data_ref(
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cp437_grid: NonNull<Cp437Grid>,
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) -> ByteSlice {
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unsafe { ByteSlice::from_slice((*cp437_grid.as_ptr()).data_ref_mut()) }
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}
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/// Creates a [Cp437GridCommand] and immediately turns that into a [Packet].
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///
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/// The provided [Cp437Grid] gets consumed.
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///
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/// Returns NULL in case of an error.
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#[no_mangle]
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pub unsafe extern "C" fn sp_cp437_grid_into_packet(
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grid: NonNull<Cp437Grid>,
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x: usize,
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y: usize,
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) -> *mut Packet {
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let grid = unsafe { heap_remove(grid) };
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match Packet::try_from(Cp437GridCommand {
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grid,
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origin: Origin::new(x, y),
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}) {
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Ok(packet) => heap_move(packet),
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Err(_) => std::ptr::null_mut(),
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}
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}
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