add command code constants, send header

src/brightness_grid.rs

@@ -9,7 +9,7 @@ use std::ptr::NonNull;
 ///
 /// # Examples
 /// ```C
-/// UdpConnection connection = sp_connection_open("127.0.0.1:2342");
+/// UdpConnection connection = sp_udp_open("127.0.0.1:2342");
 /// if (connection == NULL)
 ///     return 1;
 ///
@@ -18,7 +18,7 @@ use std::ptr::NonNull;
 /// sp_brightness_grid_set(grid, 1, 1, 10);
 ///
 /// TypedCommand command = sp_command_char_brightness(grid);
-/// sp_connection_free(connection);
+/// sp_udp_free(connection);
 /// ```
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_new(
@@ -167,5 +167,5 @@ pub unsafe extern "C" fn sp_brightness_grid_unsafe_data_ref(
     const _: () = assert!(size_of::<Brightness>() == 1);
 
     let data = unsafe { (*brightness_grid.as_ptr()).data_ref_mut() };
-    unsafe { ByteSlice::from_slice(transmute(data)) }
+    unsafe { ByteSlice::from_slice(transmute::<&mut [Brightness], &mut [u8]>(data)) }
 }

src/byte_slice.rs

@@ -24,7 +24,7 @@ impl ByteSlice {
         unsafe { std::slice::from_raw_parts(self.start.as_ptr(), self.length) }
     }
 
-    pub(crate) unsafe fn as_slice_mut(&self) -> &mut [u8] {
+    pub(crate) unsafe fn as_slice_mut(&mut self) -> &mut [u8] {
         unsafe {
             std::slice::from_raw_parts_mut(self.start.as_ptr(), self.length)
         }

src/commands/mod.rs

@@ -0,0 +1,3 @@
+mod typed;
+
+pub use typed::*;

src/commands/typed.rs

@@ -40,7 +40,7 @@ pub unsafe extern "C" fn sp_command_clone(
 /// # Examples
 ///
 /// ```C
-/// sp_connection_send_command(connection, sp_command_clear());
+/// sp_udp_send_command(connection, sp_command_clear());
 /// ```
 #[no_mangle]
 pub unsafe extern "C" fn sp_command_clear() -> NonNull<TypedCommand> {
@@ -115,10 +115,6 @@ pub unsafe extern "C" fn sp_command_bitvec(
     operation: BinaryOperation,
 ) -> *mut TypedCommand {
     let bit_vec = unsafe { *Box::from_raw(bit_vec.as_ptr()) };
-    let compression = match compression.try_into() {
-        Ok(compression) => compression,
-        Err(_) => return std::ptr::null_mut(),
-    };
     let command = servicepoint::BitVecCommand {
         offset,
         operation,
@@ -182,10 +178,6 @@ pub unsafe extern "C" fn sp_command_bitmap(
     compression: CompressionCode,
 ) -> *mut TypedCommand {
     let bitmap = unsafe { *Box::from_raw(bitmap.as_ptr()) };
-    let compression = match compression.try_into() {
-        Ok(compression) => compression,
-        Err(_) => return std::ptr::null_mut(),
-    };
     let command = servicepoint::BitmapCommand {
         origin: servicepoint::Origin::new(x, y),
         bitmap,

src/connection.rs

@@ -1,5 +1,5 @@
 use crate::{heap_drop, heap_move};
-use servicepoint::{Connection, Packet, TypedCommand, UdpConnection};
+use servicepoint::{Connection, Header, Packet, TypedCommand, UdpConnection};
 use std::ffi::{c_char, CStr};
 use std::net::{Ipv4Addr, SocketAddrV4};
 use std::ptr::NonNull;
@@ -11,9 +11,9 @@ use std::ptr::NonNull;
 /// # Examples
 ///
 /// ```C
-/// UdpConnection connection = sp_connection_open("172.23.42.29:2342");
+/// UdpConnection connection = sp_udp_open("172.23.42.29:2342");
 /// if (connection != NULL)
-///     sp_connection_send_command(connection, sp_command_clear());
+///     sp_udp_send_command(connection, sp_command_clear());
 /// ```
 #[no_mangle]
 pub unsafe extern "C" fn sp_udp_open(
@@ -37,9 +37,9 @@ pub unsafe extern "C" fn sp_udp_open(
 /// # Examples
 ///
 /// ```C
-/// UdpConnection connection = sp_connection_open_ipv4(172, 23, 42, 29, 2342);
+/// UdpConnection connection = sp_udp_open_ipv4(172, 23, 42, 29, 2342);
 /// if (connection != NULL)
-///     sp_connection_send_command(connection, sp_command_clear());
+///     sp_udp_send_command(connection, sp_command_clear());
 /// ```
 #[no_mangle]
 pub unsafe extern "C" fn sp_udp_open_ipv4(
@@ -80,8 +80,7 @@ pub unsafe extern "C" fn sp_udp_send_packet(
 /// # Examples
 ///
 /// ```C
-/// sp_connection_send_command(connection, sp_command_clear());
-/// sp_connection_send_command(connection, sp_command_brightness(5));
+/// sp_udp_send_command(connection, sp_command_brightness(5));
 /// ```
 #[no_mangle]
 pub unsafe extern "C" fn sp_udp_send_command(
@@ -92,6 +91,27 @@ pub unsafe extern "C" fn sp_udp_send_command(
     unsafe { connection.as_ref().send(command) }.is_ok()
 }
 
+/// Sends a [Header] to the display using the [UdpConnection].
+///
+/// returns: true in case of success
+///
+/// # Examples
+///
+/// ```C
+/// sp_udp_send_header(connection, sp_command_brightness(5));
+/// ```
+#[no_mangle]
+pub unsafe extern "C" fn sp_udp_send_header(
+    udp_connection: NonNull<UdpConnection>,
+    header: Header,
+) -> bool {
+    let packet = Packet {
+        header,
+        payload: vec![],
+    };
+    unsafe { udp_connection.as_ref() }.send(packet).is_ok()
+}
+
 /// Closes and deallocates a [UdpConnection].
 #[no_mangle]
 pub unsafe extern "C" fn sp_udp_free(connection: NonNull<UdpConnection>) {

src/lib.rs

@@ -9,7 +9,7 @@
 //! #include "servicepoint.h"
 //!
 //! int main(void) {
-//!     UdpConnection *connection = sp_connection_open("172.23.42.29:2342");
+//!     UdpConnection *connection = sp_udp_open("172.23.42.29:2342");
 //!     if (connection == NULL)
 //!         return 1;
 //!
@@ -17,10 +17,10 @@
 //!     sp_bitmap_fill(pixels, true);
 //!
 //!     TypedCommand *command = sp_command_bitmap_linear_win(0, 0, pixels, Uncompressed);
-//!     while (sp_connection_send_command(connection, sp_command_clone(command)));
+//!     while (sp_udp_send_command(connection, sp_command_clone(command)));
 //!
 //!     sp_command_free(command);
-//!     sp_connection_free(connection);
+//!     sp_udp_free(connection);
 //!     return 0;
 //! }
 //! ```
@@ -30,10 +30,11 @@ pub use crate::bitvec::*;
 pub use crate::brightness_grid::*;
 pub use crate::byte_slice::*;
 pub use crate::char_grid::*;
-pub use crate::command::*;
+pub use crate::commands::*;
 pub use crate::connection::*;
 pub use crate::cp437_grid::*;
 pub use crate::packet::*;
+pub use servicepoint::CommandCode;
 use std::ptr::NonNull;
 
 mod bitmap;
@@ -41,7 +42,7 @@ mod bitvec;
 mod brightness_grid;
 mod byte_slice;
 mod char_grid;
-mod command;
+mod commands;
 mod connection;
 mod cp437_grid;
 mod packet;

src/packet.rs

@@ -1,5 +1,5 @@
 use crate::{heap_drop, heap_move, heap_move_nonnull, ByteSlice};
-use servicepoint::{Header, Packet, TypedCommand};
+use servicepoint::{CommandCode, Header, Packet, TypedCommand};
 use std::ptr::NonNull;
 
 /// Turns a [TypedCommand] into a [Packet].
@@ -65,7 +65,7 @@ pub unsafe extern "C" fn sp_packet_get_header(
 pub unsafe extern "C" fn sp_packet_get_payload(
     packet: NonNull<Packet>,
 ) -> ByteSlice {
-    unsafe { ByteSlice::from_slice(&mut *(*packet.as_ptr()).payload) }
+    unsafe { ByteSlice::from_slice(&mut (*packet.as_ptr()).payload) }
 }
 
 /// Sets the payload of the provided packet to the provided data.
@@ -87,7 +87,7 @@ pub unsafe extern "C" fn sp_packet_set_payload(
 #[no_mangle]
 pub unsafe extern "C" fn sp_packet_serialize_to(
     packet: NonNull<Packet>,
-    buffer: ByteSlice,
+    mut buffer: ByteSlice,
 ) {
     unsafe {
         packet.as_ref().serialize_to(buffer.as_slice_mut());
@@ -107,3 +107,19 @@ pub unsafe extern "C" fn sp_packet_clone(
 pub unsafe extern "C" fn sp_packet_free(packet: NonNull<Packet>) {
     unsafe { heap_drop(packet) }
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn sp_u16_to_command_code(
+    code: u16,
+    result: *mut CommandCode,
+) -> bool {
+    match CommandCode::try_from(code) {
+        Ok(code) => {
+            unsafe {
+                *result = code;
+            }
+            true
+        }
+        Err(_) => false,
+    }
+}