Cargo.lock

@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "adler2"
@@ -408,7 +408,7 @@ dependencies = [
 [[package]]
 name = "servicepoint"
 version = "0.13.2"
-source = "git+https://git.berlin.ccc.de/servicepoint/servicepoint/?branch=next#fe67160974d9fed542eb37e5e9a202eaf6fe00dc"
+source = "git+https://git.berlin.ccc.de/servicepoint/servicepoint/?branch=next#aafa2bc9f91c3ae7d88607bf545d9665d50fc0db"
 dependencies = [
  "bitvec",
  "bzip2",

build.rs

@@ -6,21 +6,18 @@
 
 use std::{env, fs::copy};
 
-use cbindgen::{generate_with_config, Config};
-
 fn main() {
     let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
     println!("cargo::rerun-if-changed={crate_dir}");
 
-    let config =
+    let config = cbindgen::Config::from_file(crate_dir.clone() + "/cbindgen.toml").unwrap();
-        Config::from_file(crate_dir.clone() + "/cbindgen.toml").unwrap();
 
     let output_dir = env::var("OUT_DIR").unwrap();
     let header_file = output_dir.clone() + "/servicepoint.h";
 
-    generate_with_config(crate_dir, config)
+    if let Ok(bindings) = cbindgen::generate_with_config(crate_dir, config) {
-        .unwrap()
+        bindings.write_to_file(&header_file);
-        .write_to_file(&header_file);
+
         println!("cargo:include={output_dir}");
 
         println!("cargo::rerun-if-env-changed=SERVICEPOINT_HEADER_OUT");
@@ -30,4 +27,7 @@ fn main() {
             copy(header_file, &header_copy).unwrap();
             println!("cargo::rerun-if-changed={header_copy}");
         }
+    } else {
+        eprintln!("cargo:warning=Servicepoint header could not be generated");
+    }
 }

cbindgen.toml

@@ -19,11 +19,12 @@ line_endings = "LF"
 style = "type"
 usize_is_size_t = true
 
-# this is needed because otherwise the order in the C# bindings is different on different machines
+# this is needed because otherwise the order in the C bindings is different on different machines
 sort_by = "Name"
 
 [parse]
-parse_deps = false
+parse_deps = true
+include = ["servicepoint"]
 
 [parse.expand]
 features = ["full"]
@@ -32,5 +33,8 @@ features = ["full"]
 include = []
 exclude = []
 
+[export.rename]
+"TypedCommand" = "Command"
+
 [enum]
 rename_variants = "QualifiedScreamingSnakeCase"

example/main.c

@@ -2,17 +2,17 @@
 #include "servicepoint.h"
 
 int main(void) {
-    SPConnection *connection = sp_connection_open("localhost:2342");
+    UdpConnection *connection = sp_connection_open("localhost:2342");
     if (connection == NULL)
         return 1;
 
-    SPBitmap *pixels = sp_bitmap_new(SP_PIXEL_WIDTH, SP_PIXEL_HEIGHT);
+    Bitmap *pixels = sp_bitmap_new(SP_PIXEL_WIDTH, SP_PIXEL_HEIGHT);
     if (pixels == NULL)
       return 1;
 
     sp_bitmap_fill(pixels, true);
 
-    SPCommand *command = sp_command_bitmap_linear_win(0, 0, pixels, SP_COMPRESSION_CODE_UNCOMPRESSED);
+    Command *command = sp_command_bitmap_linear_win(0, 0, pixels, SP_COMPRESSION_CODE_UNCOMPRESSED);
     if (command == NULL)
       return 1;
 

examples/lang_c/Makefile

@@ -36,7 +36,7 @@ CCFLAGS := -static -Os \
 	-fvisibility=hidden \
 	-Bsymbolic \
 	-Wl,--exclude-libs,ALL \
-	-fno-ident \
+	-fno-ident
 	#-fuse-ld=gold \
 	-fno-exceptions
 	#-Wl,--icf=all \

include/servicepoint.h

@@ -86,6 +86,32 @@ enum SPCompressionCode
 typedef uint16_t SPCompressionCode;
 #endif // __cplusplus
 
+/**
+ * A fixed-size 2D grid of booleans.
+ *
+ * The values are stored in packed bytes (8 values per byte) in the same order as used by the display for storing pixels.
+ * This means that no conversion is necessary for sending the data to the display.
+ * The downside is that the width has to be a multiple of 8.
+ *
+ * # Examples
+ *
+ * ```rust
+ * use servicepoint::Bitmap;
+ * let mut bitmap = Bitmap::new(8, 2);
+ *
+ * ```
+ */
+typedef struct Bitmap Bitmap;
+
+/**
+ * The raw packet.
+ *
+ * Contents should probably only be used directly to use features not exposed by the library.
+ *
+ * You may want to use [`crate::Command`] or [`crate::TypedCommand`] instead.
+ */
+typedef struct Packet Packet;
+
 /**
  * A vector of bits
  *
@@ -99,108 +125,51 @@ typedef uint16_t SPCompressionCode;
 typedef struct SPBitVec SPBitVec;
 
 /**
- * A grid of pixels.
+ * This enum contains all commands provided by the library.
+ * This is useful in case you want one data type for all kinds of commands without using `dyn`.
  *
- * # Examples
+ * Please look at the contained structs for documentation per command.
- *
- * ```C
- * Cp437Grid grid = sp_bitmap_new(8, 3);
- * sp_bitmap_fill(grid, true);
- * sp_bitmap_set(grid, 0, 0, false);
- * sp_bitmap_free(grid);
- * ```
  */
-typedef struct SPBitmap SPBitmap;
+typedef struct Command Command;
 
 /**
- * A grid containing brightness values.
+ * A connection using the UDP protocol.
  *
- * # Examples
+ * Use this when sending commands directly to the display.
- * ```C
- * SPConnection connection = sp_connection_open("127.0.0.1:2342");
- * if (connection == NULL)
- *     return 1;
  *
- * SPBrightnessGrid grid = sp_brightness_grid_new(2, 2);
+ * Requires the feature "`protocol_udp`" which is enabled by default.
- * sp_brightness_grid_set(grid, 0, 0, 0);
- * sp_brightness_grid_set(grid, 1, 1, 10);
- *
- * SPCommand command = sp_command_char_brightness(grid);
- * sp_connection_free(connection);
- * ```
  */
-typedef struct SPBrightnessGrid SPBrightnessGrid;
+typedef struct UdpConnection UdpConnection;
 
 /**
- * A C-wrapper for grid containing UTF-8 characters.
+ * A 2D grid of values.
  *
- * As the rust [char] type is not FFI-safe, characters are passed in their UTF-32 form as 32bit unsigned integers.
+ * The memory layout is the one the display expects in [`crate::Command`]s.
  *
- * The encoding is enforced in most cases by the rust standard library
+ * This structure can be used with any type that implements the [Value] trait.
- * and will panic when provided with illegal characters.
+ * You can also use the concrete type aliases provided in this crate, e.g. [`crate::CharGrid`] and [`crate::ByteGrid`].
- *
- * # Examples
- *
- * ```C
- * CharGrid grid = sp_char_grid_new(4, 3);
- * sp_char_grid_fill(grid, '?');
- * sp_char_grid_set(grid, 0, 0, '!');
- * sp_char_grid_free(grid);
- * ```
  */
-typedef struct SPCharGrid SPCharGrid;
+typedef struct ValueGrid_Brightness ValueGrid_Brightness;
 
 /**
- * A low-level display command.
+ * A 2D grid of values.
  *
- * This struct and associated functions implement the UDP protocol for the display.
+ * The memory layout is the one the display expects in [`crate::Command`]s.
  *
- * To send a [SPCommand], use a [SPConnection].
+ * This structure can be used with any type that implements the [Value] trait.
- *
+ * You can also use the concrete type aliases provided in this crate, e.g. [`crate::CharGrid`] and [`crate::ByteGrid`].
- * # Examples
- *
- * ```C
- * sp_connection_send_command(connection, sp_command_clear());
- * sp_connection_send_command(connection, sp_command_brightness(5));
- * ```
- *
- * [SPConnection]: [crate::SPConnection]
  */
-typedef struct SPCommand SPCommand;
+typedef struct ValueGrid_char ValueGrid_char;
 
 /**
- * A connection to the display.
+ * A 2D grid of values.
  *
- * # Examples
+ * The memory layout is the one the display expects in [`crate::Command`]s.
  *
- * ```C
+ * This structure can be used with any type that implements the [Value] trait.
- * CConnection connection = sp_connection_open("172.23.42.29:2342");
+ * You can also use the concrete type aliases provided in this crate, e.g. [`crate::CharGrid`] and [`crate::ByteGrid`].
- * if (connection != NULL)
- *     sp_connection_send_command(connection, sp_command_clear());
- * ```
  */
-typedef struct SPConnection SPConnection;
+typedef struct ValueGrid_u8 ValueGrid_u8;
-
-/**
- * A C-wrapper for grid containing codepage 437 characters.
- *
- * The encoding is currently not enforced.
- *
- * # Examples
- *
- * ```C
- * Cp437Grid grid = sp_cp437_grid_new(4, 3);
- * sp_cp437_grid_fill(grid, '?');
- * sp_cp437_grid_set(grid, 0, 0, '!');
- * sp_cp437_grid_free(grid);
- * ```
- */
-typedef struct SPCp437Grid SPCp437Grid;
-
-/**
- * The raw packet
- */
-typedef struct SPPacket SPPacket;
 
 /**
  * Represents a span of memory (`&mut [u8]` ) as a struct usable by C code.
@@ -228,6 +197,105 @@ typedef struct {
     size_t length;
 } SPByteSlice;
 
+/**
+ * A grid containing brightness values.
+ *
+ * # Examples
+ *
+ * ```rust
+ * # use servicepoint::*;
+ * let mut grid = BrightnessGrid::new(2,2);
+ * grid.set(0, 0, Brightness::MIN);
+ * grid.set(1, 1, Brightness::MIN);
+ *
+ * # let connection = FakeConnection;
+ * connection.send(BrightnessGridCommand {
+ *     origin: Origin::new(3, 7),
+ *     grid
+ * }).unwrap()
+ * ```
+ */
+typedef ValueGrid_Brightness BrightnessGrid;
+
+/**
+ * A grid containing UTF-8 characters.
+ *
+ * To send a `CharGrid` to the display, use a [`crate::CharGridCommand`].
+ *
+ * Also see [`ValueGrid`] for the non-specialized operations and examples.
+ *
+ * # Examples
+ *
+ * ```rust
+ * # use servicepoint::*;
+ * let grid = CharGrid::from("You can\nload multiline\nstrings directly");
+ * assert_eq!(grid.get_row_str(1), Some("load multiline\0\0".to_string()));
+ *
+ * # let connection = FakeConnection;
+ * let command = CharGridCommand { origin: Origin::ZERO, grid };
+ * connection.send(command).unwrap()
+ * ```
+ */
+typedef ValueGrid_char CharGrid;
+
+/**
+ * A grid containing codepage 437 characters.
+ *
+ * The encoding is currently not enforced.
+ */
+typedef ValueGrid_u8 Cp437Grid;
+
+/**
+ * A C-wrapper for grid containing codepage 437 characters.
+ *
+ * The encoding is currently not enforced.
+ *
+ * # Examples
+ *
+ * ```C
+ * Cp437Grid grid = sp_cp437_grid_new(4, 3);
+ * sp_cp437_grid_fill(grid, '?');
+ * sp_cp437_grid_set(grid, 0, 0, '!');
+ * sp_cp437_grid_free(grid);
+ * ```
+ */
+typedef Cp437Grid SPCp437Grid;
+
+/**
+ * A raw header.
+ *
+ * The header specifies the kind of command, the size of the payload and where to display the
+ * payload, where applicable.
+ *
+ * Because the meaning of most fields depend on the command, there are no speaking names for them.
+ *
+ * The contained values are in platform endian-ness and may need to be converted before sending.
+ */
+typedef struct {
+    /**
+     * The first two bytes specify which command this packet represents.
+     */
+    uint16_t command_code;
+    /**
+     * First command-specific value
+     */
+    uint16_t a;
+    /**
+     * Second command-specific value
+     */
+    uint16_t b;
+    /**
+     * Third command-specific value
+     */
+    uint16_t c;
+    /**
+     * Fourth command-specific value
+     */
+    uint16_t d;
+} Header;
+
+
+
 #ifdef __cplusplus
 extern "C" {
 #endif // __cplusplus
@@ -250,7 +318,7 @@ extern "C" {
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_bitmap_free`.
  */
-SPBitmap *sp_bitmap_clone(const SPBitmap *bitmap);
+Bitmap *sp_bitmap_clone(const Bitmap *bitmap);
 
 /**
  * Sets the state of all pixels in the [SPBitmap].
@@ -271,7 +339,7 @@ SPBitmap *sp_bitmap_clone(const SPBitmap *bitmap);
  * - `bitmap` points to a valid [SPBitmap]
  * - `bitmap` is not written to or read from concurrently
  */
-void sp_bitmap_fill(SPBitmap *bitmap, bool value);
+void sp_bitmap_fill(Bitmap *bitmap, bool value);
 
 /**
  * Deallocates a [SPBitmap].
@@ -290,7 +358,7 @@ void sp_bitmap_fill(SPBitmap *bitmap, bool value);
  *
  * [SPCommand]: [crate::SPCommand]
  */
-void sp_bitmap_free(SPBitmap *bitmap);
+void sp_bitmap_free(Bitmap *bitmap);
 
 /**
  * Gets the current value at the specified position in the [SPBitmap].
@@ -312,7 +380,7 @@ void sp_bitmap_free(SPBitmap *bitmap);
  * - `bitmap` points to a valid [SPBitmap]
  * - `bitmap` is not written to concurrently
  */
-bool sp_bitmap_get(const SPBitmap *bitmap, size_t x, size_t y);
+bool sp_bitmap_get(const Bitmap *bitmap, size_t x, size_t y);
 
 /**
  * Gets the height in pixels of the [SPBitmap] instance.
@@ -331,7 +399,7 @@ bool sp_bitmap_get(const SPBitmap *bitmap, size_t x, size_t y);
  *
  * - `bitmap` points to a valid [SPBitmap]
  */
-size_t sp_bitmap_height(const SPBitmap *bitmap);
+size_t sp_bitmap_height(const Bitmap *bitmap);
 
 /**
  * Loads a [SPBitmap] with the specified dimensions from the provided data.
@@ -362,7 +430,7 @@ size_t sp_bitmap_height(const SPBitmap *bitmap);
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_bitmap_free`.
  */
-SPBitmap *sp_bitmap_load(size_t width,
+Bitmap *sp_bitmap_load(size_t width,
                        size_t height,
                        const uint8_t *data,
                        size_t data_length);
@@ -390,7 +458,7 @@ SPBitmap *sp_bitmap_load(size_t width,
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_bitmap_free`.
  */
-SPBitmap *sp_bitmap_new(size_t width,
+Bitmap *sp_bitmap_new(size_t width,
                       size_t height);
 
 /**
@@ -405,7 +473,7 @@ SPBitmap *sp_bitmap_new(size_t width,
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling [sp_bitmap_free].
  */
-SPBitmap *sp_bitmap_new_screen_sized(void);
+Bitmap *sp_bitmap_new_screen_sized(void);
 
 /**
  * Sets the value of the specified position in the [SPBitmap].
@@ -430,7 +498,7 @@ SPBitmap *sp_bitmap_new_screen_sized(void);
  * - `bitmap` points to a valid [SPBitmap]
  * - `bitmap` is not written to or read from concurrently
  */
-void sp_bitmap_set(SPBitmap *bitmap, size_t x, size_t y, bool value);
+void sp_bitmap_set(Bitmap *bitmap, size_t x, size_t y, bool value);
 
 /**
  * Gets an unsafe reference to the data of the [SPBitmap] instance.
@@ -447,7 +515,7 @@ void sp_bitmap_set(SPBitmap *bitmap, size_t x, size_t y, bool value);
  * - the returned memory range is never accessed after the passed [SPBitmap] has been freed
  * - the returned memory range is never accessed concurrently, either via the [SPBitmap] or directly
  */
-SPByteSlice sp_bitmap_unsafe_data_ref(SPBitmap *bitmap);
+SPByteSlice sp_bitmap_unsafe_data_ref(Bitmap *bitmap);
 
 /**
  * Gets the width in pixels of the [SPBitmap] instance.
@@ -466,7 +534,7 @@ SPByteSlice sp_bitmap_unsafe_data_ref(SPBitmap *bitmap);
  *
  * - `bitmap` points to a valid [SPBitmap]
  */
-size_t sp_bitmap_width(const SPBitmap *bitmap);
+size_t sp_bitmap_width(const Bitmap *bitmap);
 
 /**
  * Clones a [SPBitVec].
@@ -699,7 +767,7 @@ SPByteSlice sp_bitvec_unsafe_data_ref(SPBitVec *bit_vec);
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_brightness_grid_free`.
  */
-SPBrightnessGrid *sp_brightness_grid_clone(const SPBrightnessGrid *brightness_grid);
+BrightnessGrid *sp_brightness_grid_clone(const BrightnessGrid *brightness_grid);
 
 /**
  * Sets the value of all cells in the [SPBrightnessGrid].
@@ -721,7 +789,7 @@ SPBrightnessGrid *sp_brightness_grid_clone(const SPBrightnessGrid *brightness_gr
  * - `brightness_grid` points to a valid [SPBrightnessGrid]
  * - `brightness_grid` is not written to or read from concurrently
  */
-void sp_brightness_grid_fill(SPBrightnessGrid *brightness_grid, uint8_t value);
+void sp_brightness_grid_fill(BrightnessGrid *brightness_grid, uint8_t value);
 
 /**
  * Deallocates a [SPBrightnessGrid].
@@ -744,7 +812,7 @@ void sp_brightness_grid_fill(SPBrightnessGrid *brightness_grid, uint8_t value);
  *
  * [SPCommand]: [crate::SPCommand]
  */
-void sp_brightness_grid_free(SPBrightnessGrid *brightness_grid);
+void sp_brightness_grid_free(BrightnessGrid *brightness_grid);
 
 /**
  * Gets the current value at the specified position.
@@ -768,7 +836,7 @@ void sp_brightness_grid_free(SPBrightnessGrid *brightness_grid);
  * - `brightness_grid` points to a valid [SPBrightnessGrid]
  * - `brightness_grid` is not written to concurrently
  */
-uint8_t sp_brightness_grid_get(const SPBrightnessGrid *brightness_grid,
+uint8_t sp_brightness_grid_get(const BrightnessGrid *brightness_grid,
                                size_t x,
                                size_t y);
 
@@ -791,7 +859,7 @@ uint8_t sp_brightness_grid_get(const SPBrightnessGrid *brightness_grid,
  *
  * - `brightness_grid` points to a valid [SPBrightnessGrid]
  */
-size_t sp_brightness_grid_height(const SPBrightnessGrid *brightness_grid);
+size_t sp_brightness_grid_height(const BrightnessGrid *brightness_grid);
 
 /**
  * Loads a [SPBrightnessGrid] with the specified dimensions from the provided data.
@@ -812,7 +880,7 @@ size_t sp_brightness_grid_height(const SPBrightnessGrid *brightness_grid);
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_brightness_grid_free`.
  */
-SPBrightnessGrid *sp_brightness_grid_load(size_t width,
+BrightnessGrid *sp_brightness_grid_load(size_t width,
                                         size_t height,
                                         const uint8_t *data,
                                         size_t data_length);
@@ -829,7 +897,7 @@ SPBrightnessGrid *sp_brightness_grid_load(size_t width,
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_brightness_grid_free`.
  */
-SPBrightnessGrid *sp_brightness_grid_new(size_t width,
+BrightnessGrid *sp_brightness_grid_new(size_t width,
                                        size_t height);
 
 /**
@@ -856,7 +924,7 @@ SPBrightnessGrid *sp_brightness_grid_new(size_t width,
  * - `brightness_grid` points to a valid [SPBrightnessGrid]
  * - `brightness_grid` is not written to or read from concurrently
  */
-void sp_brightness_grid_set(SPBrightnessGrid *brightness_grid,
+void sp_brightness_grid_set(BrightnessGrid *brightness_grid,
                             size_t x,
                             size_t y,
                             uint8_t value);
@@ -882,7 +950,7 @@ void sp_brightness_grid_set(SPBrightnessGrid *brightness_grid,
  * - the returned memory range is never accessed after the passed [SPBrightnessGrid] has been freed
  * - the returned memory range is never accessed concurrently, either via the [SPBrightnessGrid] or directly
  */
-SPByteSlice sp_brightness_grid_unsafe_data_ref(SPBrightnessGrid *brightness_grid);
+SPByteSlice sp_brightness_grid_unsafe_data_ref(BrightnessGrid *brightness_grid);
 
 /**
  * Gets the width of the [SPBrightnessGrid] instance.
@@ -903,7 +971,7 @@ SPByteSlice sp_brightness_grid_unsafe_data_ref(SPBrightnessGrid *brightness_grid
  *
  * - `brightness_grid` points to a valid [SPBrightnessGrid]
  */
-size_t sp_brightness_grid_width(const SPBrightnessGrid *brightness_grid);
+size_t sp_brightness_grid_width(const BrightnessGrid *brightness_grid);
 
 /**
  * Clones a [SPCharGrid].
@@ -923,7 +991,7 @@ size_t sp_brightness_grid_width(const SPBrightnessGrid *brightness_grid);
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_char_grid_free`.
  */
-SPCharGrid *sp_char_grid_clone(const SPCharGrid *char_grid);
+CharGrid *sp_char_grid_clone(const CharGrid *char_grid);
 
 /**
  * Sets the value of all cells in the [SPCharGrid].
@@ -944,7 +1012,7 @@ SPCharGrid *sp_char_grid_clone(const SPCharGrid *char_grid);
  * - `char_grid` points to a valid [SPCharGrid]
  * - `char_grid` is not written to or read from concurrently
  */
-void sp_char_grid_fill(SPCharGrid *char_grid, uint32_t value);
+void sp_char_grid_fill(CharGrid *char_grid, uint32_t value);
 
 /**
  * Deallocates a [SPCharGrid].
@@ -963,7 +1031,7 @@ void sp_char_grid_fill(SPCharGrid *char_grid, uint32_t value);
  *
  * [SPCommand]: [crate::SPCommand]
  */
-void sp_char_grid_free(SPCharGrid *char_grid);
+void sp_char_grid_free(CharGrid *char_grid);
 
 /**
  * Gets the current value at the specified position.
@@ -985,7 +1053,7 @@ void sp_char_grid_free(SPCharGrid *char_grid);
  * - `char_grid` points to a valid [SPCharGrid]
  * - `char_grid` is not written to concurrently
  */
-uint32_t sp_char_grid_get(const SPCharGrid *char_grid, size_t x, size_t y);
+uint32_t sp_char_grid_get(const CharGrid *char_grid, size_t x, size_t y);
 
 /**
  * Gets the height of the [SPCharGrid] instance.
@@ -1004,7 +1072,7 @@ uint32_t sp_char_grid_get(const SPCharGrid *char_grid, size_t x, size_t y);
  *
  * - `char_grid` points to a valid [SPCharGrid]
  */
-size_t sp_char_grid_height(const SPCharGrid *char_grid);
+size_t sp_char_grid_height(const CharGrid *char_grid);
 
 /**
  * Loads a [SPCharGrid] with the specified dimensions from the provided data.
@@ -1026,7 +1094,7 @@ size_t sp_char_grid_height(const SPCharGrid *char_grid);
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_char_grid_free`.
  */
-SPCharGrid *sp_char_grid_load(size_t width,
+CharGrid *sp_char_grid_load(size_t width,
                             size_t height,
                             const uint8_t *data,
                             size_t data_length);
@@ -1043,7 +1111,7 @@ SPCharGrid *sp_char_grid_load(size_t width,
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_char_grid_free`.
  */
-SPCharGrid *sp_char_grid_new(size_t width,
+CharGrid *sp_char_grid_new(size_t width,
                            size_t height);
 
 /**
@@ -1071,10 +1139,7 @@ SPCharGrid *sp_char_grid_new(size_t width,
  *
  * [SPBitVec]: [crate::SPBitVec]
  */
-void sp_char_grid_set(SPCharGrid *char_grid,
+void sp_char_grid_set(CharGrid *char_grid, size_t x, size_t y, uint32_t value);
-                      size_t x,
-                      size_t y,
-                      uint32_t value);
 
 /**
  * Gets the width of the [SPCharGrid] instance.
@@ -1093,7 +1158,7 @@ void sp_char_grid_set(SPCharGrid *char_grid,
  *
  * - `char_grid` points to a valid [SPCharGrid]
  */
-size_t sp_char_grid_width(const SPCharGrid *char_grid);
+size_t sp_char_grid_width(const CharGrid *char_grid);
 
 /**
  * Set pixel data starting at the pixel offset on screen.
@@ -1122,7 +1187,7 @@ size_t sp_char_grid_width(const SPCharGrid *char_grid);
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_bitmap_linear(size_t offset,
+Command *sp_command_bitmap_linear(size_t offset,
                                   SPBitVec *bit_vec,
                                   SPCompressionCode compression);
 
@@ -1153,7 +1218,7 @@ SPCommand *sp_command_bitmap_linear(size_t offset,
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_bitmap_linear_and(size_t offset,
+Command *sp_command_bitmap_linear_and(size_t offset,
                                       SPBitVec *bit_vec,
                                       SPCompressionCode compression);
 
@@ -1184,7 +1249,7 @@ SPCommand *sp_command_bitmap_linear_and(size_t offset,
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_bitmap_linear_or(size_t offset,
+Command *sp_command_bitmap_linear_or(size_t offset,
                                      SPBitVec *bit_vec,
                                      SPCompressionCode compression);
 
@@ -1210,9 +1275,9 @@ SPCommand *sp_command_bitmap_linear_or(size_t offset,
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_bitmap_linear_win(size_t x,
+Command *sp_command_bitmap_linear_win(size_t x,
                                       size_t y,
-                                        SPBitmap *bitmap,
+                                      Bitmap *bitmap,
                                       SPCompressionCode compression);
 
 /**
@@ -1242,7 +1307,7 @@ SPCommand *sp_command_bitmap_linear_win(size_t x,
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_bitmap_linear_xor(size_t offset,
+Command *sp_command_bitmap_linear_xor(size_t offset,
                                       SPBitVec *bit_vec,
                                       SPCompressionCode compression);
 
@@ -1262,7 +1327,7 @@ SPCommand *sp_command_bitmap_linear_xor(size_t offset,
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_brightness(uint8_t brightness);
+Command *sp_command_brightness(uint8_t brightness);
 
 /**
  * Set the brightness of individual tiles in a rectangular area of the display.
@@ -1284,9 +1349,9 @@ SPCommand *sp_command_brightness(uint8_t brightness);
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_char_brightness(size_t x,
+Command *sp_command_char_brightness(size_t x,
                                     size_t y,
-                                      SPBrightnessGrid *grid);
+                                    BrightnessGrid *grid);
 
 /**
  * Set all pixels to the off state.
@@ -1308,7 +1373,7 @@ SPCommand *sp_command_char_brightness(size_t x,
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_clear(void);
+Command *sp_command_clear(void);
 
 /**
  * Clones a [SPCommand] instance.
@@ -1328,7 +1393,7 @@ SPCommand *sp_command_clear(void);
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_clone(const SPCommand *command);
+Command *sp_command_clone(const Command *command);
 
 /**
  * Show codepage 437 encoded text on the screen.
@@ -1350,7 +1415,7 @@ SPCommand *sp_command_clone(const SPCommand *command);
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_cp437_data(size_t x,
+Command *sp_command_cp437_data(size_t x,
                                size_t y,
                                SPCp437Grid *grid);
 
@@ -1366,7 +1431,7 @@ SPCommand *sp_command_cp437_data(size_t x,
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_fade_out(void);
+Command *sp_command_fade_out(void);
 
 /**
  * Deallocates a [SPCommand].
@@ -1390,7 +1455,7 @@ SPCommand *sp_command_fade_out(void);
  * - `command` is not used concurrently or after this call
  * - `command` was not passed to another consuming function, e.g. to create a [SPPacket]
  */
-void sp_command_free(SPCommand *command);
+void sp_command_free(Command *command);
 
 /**
  * Kills the udp daemon on the display, which usually results in a restart.
@@ -1406,9 +1471,23 @@ void sp_command_free(SPCommand *command);
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_hard_reset(void);
+Command *sp_command_hard_reset(void);
 
 /**
+ * A low-level display command.
+ *
+ * This struct and associated functions implement the UDP protocol for the display.
+ *
+ * To send a [SPCommand], use a [SPConnection].
+ *
+ * # Examples
+ *
+ * ```C
+ * sp_connection_send_command(connection, sp_command_clear());
+ * sp_connection_send_command(connection, sp_command_brightness(5));
+ * ```
+ *
+ * [SPConnection]: [crate::SPConnection]
  * Tries to turn a [SPPacket] into a [SPCommand].
  *
  * The packet is deallocated in the process.
@@ -1429,7 +1508,7 @@ SPCommand *sp_command_hard_reset(void);
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_try_from_packet(SPPacket *packet);
+Command *sp_command_try_from_packet(Packet *packet);
 
 /**
  * Show UTF-8 encoded text on the screen.
@@ -1451,9 +1530,9 @@ SPCommand *sp_command_try_from_packet(SPPacket *packet);
  * - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_command_free`.
  */
-SPCommand *sp_command_utf8_data(size_t x,
+Command *sp_command_utf8_data(size_t x,
                               size_t y,
-                                SPCharGrid *grid);
+                              CharGrid *grid);
 
 /**
  * Closes and deallocates a [SPConnection].
@@ -1469,7 +1548,7 @@ SPCommand *sp_command_utf8_data(size_t x,
  * - `connection` points to a valid [SPConnection]
  * - `connection` is not used concurrently or after this call
  */
-void sp_connection_free(SPConnection *connection);
+void sp_connection_free(UdpConnection *connection);
 
 /**
  * Creates a new instance of [SPConnection].
@@ -1487,7 +1566,7 @@ void sp_connection_free(SPConnection *connection);
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_connection_free`.
  */
-SPConnection *sp_connection_open(const char *host);
+UdpConnection *sp_connection_open(const char *host);
 
 /**
  * Sends a [SPCommand] to the display using the [SPConnection].
@@ -1509,8 +1588,8 @@ SPConnection *sp_connection_open(const char *host);
  * - `command` points to a valid instance of [SPPacket]
  * - `command` is not used concurrently or after this call
  */
-bool sp_connection_send_command(const SPConnection *connection,
+bool sp_connection_send_command(const UdpConnection *connection,
-                                SPCommand *command);
+                                Command *command);
 
 /**
  * Sends a [SPPacket] to the display using the [SPConnection].
@@ -1532,8 +1611,7 @@ bool sp_connection_send_command(const SPConnection *connection,
  * - `packet` points to a valid instance of [SPPacket]
  * - `packet` is not used concurrently or after this call
  */
-bool sp_connection_send_packet(const SPConnection *connection,
+bool sp_connection_send_packet(const UdpConnection *connection, Packet *packet);
-                               SPPacket *packet);
 
 /**
  * Clones a [SPCp437Grid].
@@ -1761,7 +1839,7 @@ size_t sp_cp437_grid_width(const SPCp437Grid *cp437_grid);
  * - the returned instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_packet_free`.
  */
-SPPacket *sp_packet_clone(const SPPacket *packet);
+Packet *sp_packet_clone(const Packet *packet);
 
 /**
  * Deallocates a [SPPacket].
@@ -1777,7 +1855,7 @@ SPPacket *sp_packet_clone(const SPPacket *packet);
  * - `packet` points to a valid [SPPacket]
  * - `packet` is not used concurrently or after this call
  */
-void sp_packet_free(SPPacket *packet);
+void sp_packet_free(Packet *packet);
 
 /**
  * Turns a [SPCommand] into a [SPPacket].
@@ -1798,7 +1876,7 @@ void sp_packet_free(SPPacket *packet);
  * - the returned [SPPacket] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_packet_free`.
  */
-SPPacket *sp_packet_from_command(SPCommand *command);
+Packet *sp_packet_from_command(Command *command);
 
 /**
  * Creates a raw [SPPacket] from parts.
@@ -1826,14 +1904,12 @@ SPPacket *sp_packet_from_command(SPCommand *command);
  * - the returned [SPPacket] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling [sp_packet_free].
  */
-SPPacket *sp_packet_from_parts(uint16_t command_code,
+Packet *sp_packet_from_parts(Header header,
-                               uint16_t a,
-                               uint16_t b,
-                               uint16_t c,
-                               uint16_t d,
                              const uint8_t *payload,
                              size_t payload_len);
 
+Header sp_packet_get_header(const Packet *packet);
+
 /**
  * Tries to load a [SPPacket] from the passed array with the specified length.
  *
@@ -1852,7 +1928,7 @@ SPPacket *sp_packet_from_parts(uint16_t command_code,
  * - the returned [SPPacket] instance is freed in some way, either by using a consuming function or
  *   by explicitly calling `sp_packet_free`.
  */
-SPPacket *sp_packet_try_load(const uint8_t *data,
+Packet *sp_packet_try_load(const uint8_t *data,
                            size_t length);
 
 #ifdef __cplusplus

src/bitmap.rs

@@ -1,23 +1,23 @@
 //! C functions for interacting with [SPBitmap]s
 //!
 //! prefix `sp_bitmap_`
+//!
+//! A grid of pixels.
+//!
+//! # Examples
+//!
+//! ```C
+//! Cp437Grid grid = sp_bitmap_new(8, 3);
+//! sp_bitmap_fill(grid, true);
+//! sp_bitmap_set(grid, 0, 0, false);
+//! sp_bitmap_free(grid);
+//! ```
 
 use servicepoint::{DataRef, Grid};
 use std::ptr::NonNull;
 
 use crate::byte_slice::SPByteSlice;
 
-/// A grid of pixels.
-///
-/// # Examples
-///
-/// ```C
-/// Cp437Grid grid = sp_bitmap_new(8, 3);
-/// sp_bitmap_fill(grid, true);
-/// sp_bitmap_set(grid, 0, 0, false);
-/// sp_bitmap_free(grid);
-/// ```
-pub struct SPBitmap(pub(crate) servicepoint::Bitmap);
 
 /// Creates a new [SPBitmap] with the specified dimensions.
 ///
@@ -44,9 +44,9 @@ pub struct SPBitmap(pub(crate) servicepoint::Bitmap);
 pub unsafe extern "C" fn sp_bitmap_new(
     width: usize,
     height: usize,
-) -> *mut SPBitmap {
+) -> *mut servicepoint::Bitmap {
     if let Some(bitmap) = servicepoint::Bitmap::new(width, height) {
-        Box::leak(Box::new(SPBitmap(bitmap)))
+        Box::leak(Box::new(bitmap))
     } else {
         std::ptr::null_mut()
     }
@@ -63,8 +63,8 @@ pub unsafe extern "C" fn sp_bitmap_new(
 /// - the returned instance is freed in some way, either by using a consuming function or
 ///   by explicitly calling [sp_bitmap_free].
 #[no_mangle]
-pub unsafe extern "C" fn sp_bitmap_new_screen_sized() -> NonNull<SPBitmap> {
+pub unsafe extern "C" fn sp_bitmap_new_screen_sized() -> NonNull<servicepoint::Bitmap> {
-    let result = Box::new(SPBitmap(servicepoint::Bitmap::max_sized()));
+    let result = Box::new(servicepoint::Bitmap::max_sized());
     NonNull::from(Box::leak(result))
 }
 
@@ -101,11 +101,11 @@ pub unsafe extern "C" fn sp_bitmap_load(
     height: usize,
     data: *const u8,
     data_length: usize,
-) -> *mut SPBitmap {
+) -> *mut servicepoint::Bitmap {
     assert!(!data.is_null());
     let data = unsafe { std::slice::from_raw_parts(data, data_length) };
     if let Ok(bitmap) = servicepoint::Bitmap::load(width, height, data) {
-        Box::leak(Box::new(SPBitmap(bitmap)))
+        Box::leak(Box::new(bitmap))
     } else {
         std::ptr::null_mut()
     }
@@ -129,10 +129,10 @@ pub unsafe extern "C" fn sp_bitmap_load(
 ///   by explicitly calling `sp_bitmap_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_bitmap_clone(
-    bitmap: *const SPBitmap,
+    bitmap: *const servicepoint::Bitmap,
-) -> NonNull<SPBitmap> {
+) -> NonNull<servicepoint::Bitmap> {
     assert!(!bitmap.is_null());
-    let result = Box::new(SPBitmap(unsafe { (*bitmap).0.clone() }));
+    let result = Box::new(unsafe { (*bitmap).clone() });
     NonNull::from(Box::leak(result))
 }
 
@@ -152,7 +152,7 @@ pub unsafe extern "C" fn sp_bitmap_clone(
 ///
 /// [SPCommand]: [crate::SPCommand]
 #[no_mangle]
-pub unsafe extern "C" fn sp_bitmap_free(bitmap: *mut SPBitmap) {
+pub unsafe extern "C" fn sp_bitmap_free(bitmap: *mut servicepoint::Bitmap) {
     assert!(!bitmap.is_null());
     _ = unsafe { Box::from_raw(bitmap) };
 }
@@ -177,12 +177,12 @@ pub unsafe extern "C" fn sp_bitmap_free(bitmap: *mut SPBitmap) {
 /// - `bitmap` is not written to concurrently
 #[no_mangle]
 pub unsafe extern "C" fn sp_bitmap_get(
-    bitmap: *const SPBitmap,
+    bitmap: *const servicepoint::Bitmap,
     x: usize,
     y: usize,
 ) -> bool {
     assert!(!bitmap.is_null());
-    unsafe { (*bitmap).0.get(x, y) }
+    unsafe { (*bitmap).get(x, y) }
 }
 
 /// Sets the value of the specified position in the [SPBitmap].
@@ -208,13 +208,13 @@ pub unsafe extern "C" fn sp_bitmap_get(
 /// - `bitmap` is not written to or read from concurrently
 #[no_mangle]
 pub unsafe extern "C" fn sp_bitmap_set(
-    bitmap: *mut SPBitmap,
+    bitmap: *mut servicepoint::Bitmap,
     x: usize,
     y: usize,
     value: bool,
 ) {
     assert!(!bitmap.is_null());
-    unsafe { (*bitmap).0.set(x, y, value) };
+    unsafe { (*bitmap).set(x, y, value) };
 }
 
 /// Sets the state of all pixels in the [SPBitmap].
@@ -235,9 +235,9 @@ pub unsafe extern "C" fn sp_bitmap_set(
 /// - `bitmap` points to a valid [SPBitmap]
 /// - `bitmap` is not written to or read from concurrently
 #[no_mangle]
-pub unsafe extern "C" fn sp_bitmap_fill(bitmap: *mut SPBitmap, value: bool) {
+pub unsafe extern "C" fn sp_bitmap_fill(bitmap: *mut servicepoint::Bitmap, value: bool) {
     assert!(!bitmap.is_null());
-    unsafe { (*bitmap).0.fill(value) };
+    unsafe { (*bitmap).fill(value) };
 }
 
 /// Gets the width in pixels of the [SPBitmap] instance.
@@ -256,9 +256,9 @@ pub unsafe extern "C" fn sp_bitmap_fill(bitmap: *mut SPBitmap, value: bool) {
 ///
 /// - `bitmap` points to a valid [SPBitmap]
 #[no_mangle]
-pub unsafe extern "C" fn sp_bitmap_width(bitmap: *const SPBitmap) -> usize {
+pub unsafe extern "C" fn sp_bitmap_width(bitmap: *const servicepoint::Bitmap) -> usize {
     assert!(!bitmap.is_null());
-    unsafe { (*bitmap).0.width() }
+    unsafe { (*bitmap).width() }
 }
 
 /// Gets the height in pixels of the [SPBitmap] instance.
@@ -277,9 +277,9 @@ pub unsafe extern "C" fn sp_bitmap_width(bitmap: *const SPBitmap) -> usize {
 ///
 /// - `bitmap` points to a valid [SPBitmap]
 #[no_mangle]
-pub unsafe extern "C" fn sp_bitmap_height(bitmap: *const SPBitmap) -> usize {
+pub unsafe extern "C" fn sp_bitmap_height(bitmap: *const servicepoint::Bitmap) -> usize {
     assert!(!bitmap.is_null());
-    unsafe { (*bitmap).0.height() }
+    unsafe { (*bitmap).height() }
 }
 
 /// Gets an unsafe reference to the data of the [SPBitmap] instance.
@@ -297,10 +297,10 @@ pub unsafe extern "C" fn sp_bitmap_height(bitmap: *const SPBitmap) -> usize {
 /// - the returned memory range is never accessed concurrently, either via the [SPBitmap] or directly
 #[no_mangle]
 pub unsafe extern "C" fn sp_bitmap_unsafe_data_ref(
-    bitmap: *mut SPBitmap,
+    bitmap: *mut servicepoint::Bitmap,
 ) -> SPByteSlice {
     assert!(!bitmap.is_null());
-    let data = unsafe { (*bitmap).0.data_ref_mut() };
+    let data = unsafe { (*bitmap).data_ref_mut() };
     SPByteSlice {
         start: NonNull::new(data.as_mut_ptr_range().start).unwrap(),
         length: data.len(),

src/bitvec.rs

@@ -13,15 +13,15 @@ use std::ptr::NonNull;
 /// sp_bitvec_set(vec, 5, true);
 /// sp_bitvec_free(vec);
 /// ```
-pub struct SPBitVec(servicepoint::BitVec);
+pub struct SPBitVec(servicepoint::BitVecU8Msb0);
 
-impl From<servicepoint::BitVec> for SPBitVec {
+impl From<servicepoint::BitVecU8Msb0> for SPBitVec {
-    fn from(actual: servicepoint::BitVec) -> Self {
+    fn from(actual: servicepoint::BitVecU8Msb0) -> Self {
         Self(actual)
     }
 }
 
-impl From<SPBitVec> for servicepoint::BitVec {
+impl From<SPBitVec> for servicepoint::BitVecU8Msb0 {
     fn from(value: SPBitVec) -> Self {
         value.0
     }
@@ -53,7 +53,7 @@ impl Clone for SPBitVec {
 ///   by explicitly calling `sp_bitvec_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_bitvec_new(size: usize) -> NonNull<SPBitVec> {
-    let result = Box::new(SPBitVec(servicepoint::BitVec::repeat(false, size)));
+    let result = Box::new(SPBitVec(servicepoint::BitVecU8Msb0::repeat(false, size)));
     NonNull::from(Box::leak(result))
 }
 
@@ -80,7 +80,7 @@ pub unsafe extern "C" fn sp_bitvec_load(
 ) -> NonNull<SPBitVec> {
     assert!(!data.is_null());
     let data = unsafe { std::slice::from_raw_parts(data, data_length) };
-    let result = Box::new(SPBitVec(servicepoint::BitVec::from_slice(data)));
+    let result = Box::new(SPBitVec(servicepoint::BitVecU8Msb0::from_slice(data)));
     NonNull::from(Box::leak(result))
 }
 

src/brightness_grid.rs

@@ -1,9 +1,26 @@
 //! C functions for interacting with [SPBrightnessGrid]s
 //!
 //! prefix `sp_brightness_grid_`
+//!
+//!
+//! A grid containing brightness values.
+//!
+//! # Examples
+//! ```C
+//! SPConnection connection = sp_connection_open("127.0.0.1:2342");
+//! if (connection == NULL)
+//!     return 1;
+//!
+//! SPBrightnessGrid grid = sp_brightness_grid_new(2, 2);
+//! sp_brightness_grid_set(grid, 0, 0, 0);
+//! sp_brightness_grid_set(grid, 1, 1, 10);
+//!
+//! SPCommand command = sp_command_char_brightness(grid);
+//! sp_connection_free(connection);
+//! ```
 
 use crate::SPByteSlice;
-use servicepoint::{DataRef, Grid};
+use servicepoint::{BrightnessGrid, DataRef, Grid};
 use std::convert::Into;
 use std::mem::transmute;
 use std::ptr::NonNull;
@@ -15,23 +32,6 @@ pub const SP_BRIGHTNESS_MAX: u8 = 11;
 /// Count of possible brightness values
 pub const SP_BRIGHTNESS_LEVELS: u8 = 12;
 
-/// A grid containing brightness values.
-///
-/// # Examples
-/// ```C
-/// SPConnection connection = sp_connection_open("127.0.0.1:2342");
-/// if (connection == NULL)
-///     return 1;
-///
-/// SPBrightnessGrid grid = sp_brightness_grid_new(2, 2);
-/// sp_brightness_grid_set(grid, 0, 0, 0);
-/// sp_brightness_grid_set(grid, 1, 1, 10);
-///
-/// SPCommand command = sp_command_char_brightness(grid);
-/// sp_connection_free(connection);
-/// ```
-#[derive(Clone)]
-pub struct SPBrightnessGrid(pub(crate) servicepoint::BrightnessGrid);
 
 /// Creates a new [SPBrightnessGrid] with the specified dimensions.
 ///
@@ -47,10 +47,10 @@ pub struct SPBrightnessGrid(pub(crate) servicepoint::BrightnessGrid);
 pub unsafe extern "C" fn sp_brightness_grid_new(
     width: usize,
     height: usize,
-) -> NonNull<SPBrightnessGrid> {
+) -> NonNull<BrightnessGrid> {
-    let result = Box::new(SPBrightnessGrid(servicepoint::BrightnessGrid::new(
+    let result = Box::new(servicepoint::BrightnessGrid::new(
         width, height,
-    )));
+    ));
     NonNull::from(Box::leak(result))
 }
 
@@ -77,7 +77,7 @@ pub unsafe extern "C" fn sp_brightness_grid_load(
     height: usize,
     data: *const u8,
     data_length: usize,
-) -> *mut SPBrightnessGrid {
+) -> *mut BrightnessGrid {
     assert!(!data.is_null());
     let data = unsafe { std::slice::from_raw_parts(data, data_length) };
     let grid = match servicepoint::ByteGrid::load(width, height, data) {
@@ -85,7 +85,7 @@ pub unsafe extern "C" fn sp_brightness_grid_load(
         Some(grid) => grid,
     };
     if let Ok(grid) = servicepoint::BrightnessGrid::try_from(grid) {
-        Box::leak(Box::new(SPBrightnessGrid(grid)))
+        Box::leak(Box::new(grid))
     } else {
         std::ptr::null_mut()
     }
@@ -113,8 +113,8 @@ pub unsafe extern "C" fn sp_brightness_grid_load(
 ///   by explicitly calling `sp_brightness_grid_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_clone(
-    brightness_grid: *const SPBrightnessGrid,
+    brightness_grid: *const BrightnessGrid,
-) -> NonNull<SPBrightnessGrid> {
+) -> NonNull<BrightnessGrid> {
     assert!(!brightness_grid.is_null());
     let result = Box::new(unsafe { (*brightness_grid).clone() });
     NonNull::from(Box::leak(result))
@@ -141,7 +141,7 @@ pub unsafe extern "C" fn sp_brightness_grid_clone(
 /// [SPCommand]: [crate::SPCommand]
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_free(
-    brightness_grid: *mut SPBrightnessGrid,
+    brightness_grid: *mut BrightnessGrid,
 ) {
     assert!(!brightness_grid.is_null());
     _ = unsafe { Box::from_raw(brightness_grid) };
@@ -169,12 +169,12 @@ pub unsafe extern "C" fn sp_brightness_grid_free(
 /// - `brightness_grid` is not written to concurrently
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_get(
-    brightness_grid: *const SPBrightnessGrid,
+    brightness_grid: *const BrightnessGrid,
     x: usize,
     y: usize,
 ) -> u8 {
     assert!(!brightness_grid.is_null());
-    unsafe { (*brightness_grid).0.get(x, y) }.into()
+    unsafe { (*brightness_grid).get(x, y) }.into()
 }
 
 /// Sets the value of the specified position in the [SPBrightnessGrid].
@@ -201,7 +201,7 @@ pub unsafe extern "C" fn sp_brightness_grid_get(
 /// - `brightness_grid` is not written to or read from concurrently
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_set(
-    brightness_grid: *mut SPBrightnessGrid,
+    brightness_grid: *mut BrightnessGrid,
     x: usize,
     y: usize,
     value: u8,
@@ -209,7 +209,7 @@ pub unsafe extern "C" fn sp_brightness_grid_set(
     assert!(!brightness_grid.is_null());
     let brightness = servicepoint::Brightness::try_from(value)
         .expect("invalid brightness value");
-    unsafe { (*brightness_grid).0.set(x, y, brightness) };
+    unsafe { (*brightness_grid).set(x, y, brightness) };
 }
 
 /// Sets the value of all cells in the [SPBrightnessGrid].
@@ -232,13 +232,13 @@ pub unsafe extern "C" fn sp_brightness_grid_set(
 /// - `brightness_grid` is not written to or read from concurrently
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_fill(
-    brightness_grid: *mut SPBrightnessGrid,
+    brightness_grid: *mut BrightnessGrid,
     value: u8,
 ) {
     assert!(!brightness_grid.is_null());
     let brightness = servicepoint::Brightness::try_from(value)
         .expect("invalid brightness value");
-    unsafe { (*brightness_grid).0.fill(brightness) };
+    unsafe { (*brightness_grid).fill(brightness) };
 }
 
 /// Gets the width of the [SPBrightnessGrid] instance.
@@ -260,10 +260,10 @@ pub unsafe extern "C" fn sp_brightness_grid_fill(
 /// - `brightness_grid` points to a valid [SPBrightnessGrid]
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_width(
-    brightness_grid: *const SPBrightnessGrid,
+    brightness_grid: *const BrightnessGrid,
 ) -> usize {
     assert!(!brightness_grid.is_null());
-    unsafe { (*brightness_grid).0.width() }
+    unsafe { (*brightness_grid).width() }
 }
 
 /// Gets the height of the [SPBrightnessGrid] instance.
@@ -285,10 +285,10 @@ pub unsafe extern "C" fn sp_brightness_grid_width(
 /// - `brightness_grid` points to a valid [SPBrightnessGrid]
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_height(
-    brightness_grid: *const SPBrightnessGrid,
+    brightness_grid: *const BrightnessGrid,
 ) -> usize {
     assert!(!brightness_grid.is_null());
-    unsafe { (*brightness_grid).0.height() }
+    unsafe { (*brightness_grid).height() }
 }
 
 /// Gets an unsafe reference to the data of the [SPBrightnessGrid] instance.
@@ -312,11 +312,11 @@ pub unsafe extern "C" fn sp_brightness_grid_height(
 /// - the returned memory range is never accessed concurrently, either via the [SPBrightnessGrid] or directly
 #[no_mangle]
 pub unsafe extern "C" fn sp_brightness_grid_unsafe_data_ref(
-    brightness_grid: *mut SPBrightnessGrid,
+    brightness_grid: *mut BrightnessGrid,
 ) -> SPByteSlice {
     assert!(!brightness_grid.is_null());
     assert_eq!(core::mem::size_of::<servicepoint::Brightness>(), 1);
-    let data = unsafe { (*brightness_grid).0.data_ref_mut() };
+    let data = unsafe { (*brightness_grid).data_ref_mut() };
     // this assumes more about the memory layout than rust guarantees. yikes!
     let data: &mut [u8] = unsafe { transmute(data) };
     SPByteSlice {

src/char_grid.rs

@@ -1,33 +1,26 @@
 //! C functions for interacting with [SPCharGrid]s
 //!
 //! prefix `sp_char_grid_`
+//!
+//! A C-wrapper for grid containing UTF-8 characters.
+//!
+//! As the rust [char] type is not FFI-safe, characters are passed in their UTF-32 form as 32bit unsigned integers.
+//!
+//! The encoding is enforced in most cases by the rust standard library
+//! and will panic when provided with illegal characters.
+//!
+//! # Examples
+//!
+//! ```C
+//! CharGrid grid = sp_char_grid_new(4, 3);
+//! sp_char_grid_fill(grid, '?');
+//! sp_char_grid_set(grid, 0, 0, '!');
+//! sp_char_grid_free(grid);
+//! ```
 
-use servicepoint::Grid;
+use servicepoint::{CharGrid, Grid};
 use std::ptr::NonNull;
 
-/// A C-wrapper for grid containing UTF-8 characters.
-///
-/// As the rust [char] type is not FFI-safe, characters are passed in their UTF-32 form as 32bit unsigned integers.
-///
-/// The encoding is enforced in most cases by the rust standard library
-/// and will panic when provided with illegal characters.
-///
-/// # Examples
-///
-/// ```C
-/// CharGrid grid = sp_char_grid_new(4, 3);
-/// sp_char_grid_fill(grid, '?');
-/// sp_char_grid_set(grid, 0, 0, '!');
-/// sp_char_grid_free(grid);
-/// ```
-pub struct SPCharGrid(pub(crate) servicepoint::CharGrid);
-
-impl Clone for SPCharGrid {
-    fn clone(&self) -> Self {
-        SPCharGrid(self.0.clone())
-    }
-}
-
 /// Creates a new [SPCharGrid] with the specified dimensions.
 ///
 /// returns: [SPCharGrid] initialized to 0. Will never return NULL.
@@ -42,9 +35,8 @@ impl Clone for SPCharGrid {
 pub unsafe extern "C" fn sp_char_grid_new(
     width: usize,
     height: usize,
-) -> NonNull<SPCharGrid> {
+) -> NonNull<CharGrid> {
-    let result =
+    let result =        Box::new(CharGrid::new(width, height));
-        Box::new(SPCharGrid(servicepoint::CharGrid::new(width, height)));
     NonNull::from(Box::leak(result))
 }
 
@@ -72,13 +64,14 @@ pub unsafe extern "C" fn sp_char_grid_load(
     height: usize,
     data: *const u8,
     data_length: usize,
-) -> NonNull<SPCharGrid> {
+) -> NonNull<CharGrid> {
     assert!(data.is_null());
     let data = unsafe { std::slice::from_raw_parts(data, data_length) };
-    let result = Box::new(SPCharGrid(
+    // TODO remove unwrap
-        servicepoint::CharGrid::load_utf8(width, height, data.to_vec())
+    let result = Box::new(
+        CharGrid::load_utf8(width, height, data.to_vec())
             .unwrap(),
-    ));
+    );
     NonNull::from(Box::leak(result))
 }
 
@@ -100,8 +93,8 @@ pub unsafe extern "C" fn sp_char_grid_load(
 ///   by explicitly calling `sp_char_grid_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_char_grid_clone(
-    char_grid: *const SPCharGrid,
+    char_grid: *const CharGrid,
-) -> NonNull<SPCharGrid> {
+) -> NonNull<CharGrid> {
     assert!(!char_grid.is_null());
     let result = Box::new(unsafe { (*char_grid).clone() });
     NonNull::from(Box::leak(result))
@@ -123,7 +116,7 @@ pub unsafe extern "C" fn sp_char_grid_clone(
 ///
 /// [SPCommand]: [crate::SPCommand]
 #[no_mangle]
-pub unsafe extern "C" fn sp_char_grid_free(char_grid: *mut SPCharGrid) {
+pub unsafe extern "C" fn sp_char_grid_free(char_grid: *mut CharGrid) {
     assert!(!char_grid.is_null());
     _ = unsafe { Box::from_raw(char_grid) };
 }
@@ -148,12 +141,12 @@ pub unsafe extern "C" fn sp_char_grid_free(char_grid: *mut SPCharGrid) {
 /// - `char_grid` is not written to concurrently
 #[no_mangle]
 pub unsafe extern "C" fn sp_char_grid_get(
-    char_grid: *const SPCharGrid,
+    char_grid: *const CharGrid,
     x: usize,
     y: usize,
 ) -> u32 {
     assert!(!char_grid.is_null());
-    unsafe { (*char_grid).0.get(x, y) as u32 }
+    unsafe { (*char_grid).get(x, y) as u32 }
 }
 
 /// Sets the value of the specified position in the [SPCharGrid].
@@ -181,13 +174,13 @@ pub unsafe extern "C" fn sp_char_grid_get(
 /// [SPBitVec]: [crate::SPBitVec]
 #[no_mangle]
 pub unsafe extern "C" fn sp_char_grid_set(
-    char_grid: *mut SPCharGrid,
+    char_grid: *mut CharGrid,
     x: usize,
     y: usize,
     value: u32,
 ) {
     assert!(!char_grid.is_null());
-    unsafe { (*char_grid).0.set(x, y, char::from_u32(value).unwrap()) };
+    unsafe { (*char_grid).set(x, y, char::from_u32(value).unwrap()) };
 }
 
 /// Sets the value of all cells in the [SPCharGrid].
@@ -209,11 +202,11 @@ pub unsafe extern "C" fn sp_char_grid_set(
 /// - `char_grid` is not written to or read from concurrently
 #[no_mangle]
 pub unsafe extern "C" fn sp_char_grid_fill(
-    char_grid: *mut SPCharGrid,
+    char_grid: *mut CharGrid,
     value: u32,
 ) {
     assert!(!char_grid.is_null());
-    unsafe { (*char_grid).0.fill(char::from_u32(value).unwrap()) };
+    unsafe { (*char_grid).fill(char::from_u32(value).unwrap()) };
 }
 
 /// Gets the width of the [SPCharGrid] instance.
@@ -233,10 +226,10 @@ pub unsafe extern "C" fn sp_char_grid_fill(
 /// - `char_grid` points to a valid [SPCharGrid]
 #[no_mangle]
 pub unsafe extern "C" fn sp_char_grid_width(
-    char_grid: *const SPCharGrid,
+    char_grid: *const CharGrid,
 ) -> usize {
     assert!(!char_grid.is_null());
-    unsafe { (*char_grid).0.width() }
+    unsafe { (*char_grid).width() }
 }
 
 /// Gets the height of the [SPCharGrid] instance.
@@ -256,8 +249,8 @@ pub unsafe extern "C" fn sp_char_grid_width(
 /// - `char_grid` points to a valid [SPCharGrid]
 #[no_mangle]
 pub unsafe extern "C" fn sp_char_grid_height(
-    char_grid: *const SPCharGrid,
+    char_grid: *const CharGrid,
 ) -> usize {
     assert!(!char_grid.is_null());
-    unsafe { (*char_grid).0.height() }
+    unsafe { (*char_grid).height() }
 }

src/command.rs

@@ -2,11 +2,8 @@
 //!
 //! prefix `sp_command_`
 
-use crate::{
+use crate::{SPBitVec, SPCompressionCode, SPCp437Grid};
-    SPBitVec, SPBitmap, SPBrightnessGrid, SPCharGrid, SPCompressionCode,
+use servicepoint::{BinaryOperation, BrightnessGrid, CharGrid, GlobalBrightnessCommand, Packet, TypedCommand};
-    SPCp437Grid, SPPacket,
-};
-use servicepoint::{BinaryOperation, GlobalBrightnessCommand};
 use std::ptr::NonNull;
 
 /// A low-level display command.
@@ -23,13 +20,7 @@ use std::ptr::NonNull;
 /// ```
 ///
 /// [SPConnection]: [crate::SPConnection]
-pub struct SPCommand(pub(crate) servicepoint::TypedCommand);
 
-impl Clone for SPCommand {
-    fn clone(&self) -> Self {
-        SPCommand(self.0.clone())
-    }
-}
 
 /// Tries to turn a [SPPacket] into a [SPCommand].
 ///
@@ -52,12 +43,12 @@ impl Clone for SPCommand {
 ///   by explicitly calling `sp_command_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_command_try_from_packet(
-    packet: *mut SPPacket,
+    packet: *mut Packet,
-) -> *mut SPCommand {
+) -> *mut TypedCommand {
     let packet = *unsafe { Box::from_raw(packet) };
-    match servicepoint::TypedCommand::try_from(packet.0) {
+    match servicepoint::TypedCommand::try_from(packet) {
         Err(_) => std::ptr::null_mut(),
-        Ok(command) => Box::into_raw(Box::new(SPCommand(command))),
+        Ok(command) => Box::into_raw(Box::new(command)),
     }
 }
 
@@ -79,8 +70,8 @@ pub unsafe extern "C" fn sp_command_try_from_packet(
 ///   by explicitly calling `sp_command_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_command_clone(
-    command: *const SPCommand,
+    command: *const TypedCommand,
-) -> NonNull<SPCommand> {
+) -> NonNull<TypedCommand> {
     assert!(!command.is_null());
     let result = Box::new(unsafe { (*command).clone() });
     NonNull::from(Box::leak(result))
@@ -105,8 +96,8 @@ pub unsafe extern "C" fn sp_command_clone(
 /// - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
 ///   by explicitly calling `sp_command_free`.
 #[no_mangle]
-pub unsafe extern "C" fn sp_command_clear() -> NonNull<SPCommand> {
+pub unsafe extern "C" fn sp_command_clear() -> NonNull<TypedCommand> {
-    let result = Box::new(SPCommand(servicepoint::ClearCommand.into()));
+    let result = Box::new(servicepoint::ClearCommand.into());
     NonNull::from(Box::leak(result))
 }
 
@@ -123,8 +114,8 @@ pub unsafe extern "C" fn sp_command_clear() -> NonNull<SPCommand> {
 /// - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
 ///   by explicitly calling `sp_command_free`.
 #[no_mangle]
-pub unsafe extern "C" fn sp_command_hard_reset() -> NonNull<SPCommand> {
+pub unsafe extern "C" fn sp_command_hard_reset() -> NonNull<TypedCommand> {
-    let result = Box::new(SPCommand(servicepoint::HardResetCommand.into()));
+    let result = Box::new(servicepoint::HardResetCommand.into());
     NonNull::from(Box::leak(result))
 }
 
@@ -139,8 +130,8 @@ pub unsafe extern "C" fn sp_command_hard_reset() -> NonNull<SPCommand> {
 /// - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
 ///   by explicitly calling `sp_command_free`.
 #[no_mangle]
-pub unsafe extern "C" fn sp_command_fade_out() -> NonNull<SPCommand> {
+pub unsafe extern "C" fn sp_command_fade_out() -> NonNull<TypedCommand> {
-    let result = Box::new(SPCommand(servicepoint::FadeOutCommand.into()));
+    let result = Box::new(servicepoint::FadeOutCommand.into());
     NonNull::from(Box::leak(result))
 }
 
@@ -161,11 +152,11 @@ pub unsafe extern "C" fn sp_command_fade_out() -> NonNull<SPCommand> {
 #[no_mangle]
 pub unsafe extern "C" fn sp_command_brightness(
     brightness: u8,
-) -> NonNull<SPCommand> {
+) -> NonNull<TypedCommand> {
     let brightness = servicepoint::Brightness::try_from(brightness)
         .expect("invalid brightness");
     let result =
-        Box::new(SPCommand(GlobalBrightnessCommand::from(brightness).into()));
+        Box::new(GlobalBrightnessCommand::from(brightness).into());
     NonNull::from(Box::leak(result))
 }
 
@@ -191,17 +182,17 @@ pub unsafe extern "C" fn sp_command_brightness(
 pub unsafe extern "C" fn sp_command_char_brightness(
     x: usize,
     y: usize,
-    grid: *mut SPBrightnessGrid,
+    grid: *mut BrightnessGrid,
-) -> NonNull<SPCommand> {
+) -> NonNull<TypedCommand> {
     assert!(!grid.is_null());
-    let byte_grid = unsafe { *Box::from_raw(grid) };
+    let grid = unsafe { *Box::from_raw(grid) };
-    let result = Box::new(SPCommand(
+    let result = Box::new(
         servicepoint::BrightnessGridCommand {
             origin: servicepoint::Origin::new(x, y),
-            grid: byte_grid.0,
+            grid,
         }
         .into(),
-    ));
+    );
     NonNull::from(Box::leak(result))
 }
 
@@ -235,7 +226,7 @@ pub unsafe extern "C" fn sp_command_bitmap_linear(
     offset: usize,
     bit_vec: *mut SPBitVec,
     compression: SPCompressionCode,
-) -> *mut SPCommand {
+) -> *mut TypedCommand {
     unsafe {
         sp_command_bitmap_linear_internal(
             offset,
@@ -276,7 +267,7 @@ pub unsafe extern "C" fn sp_command_bitmap_linear_and(
     offset: usize,
     bit_vec: *mut SPBitVec,
     compression: SPCompressionCode,
-) -> *mut SPCommand {
+) -> *mut TypedCommand {
     unsafe {
         sp_command_bitmap_linear_internal(
             offset,
@@ -317,7 +308,7 @@ pub unsafe extern "C" fn sp_command_bitmap_linear_or(
     offset: usize,
     bit_vec: *mut SPBitVec,
     compression: SPCompressionCode,
-) -> *mut SPCommand {
+) -> *mut TypedCommand {
     unsafe {
         sp_command_bitmap_linear_internal(
             offset,
@@ -358,7 +349,7 @@ pub unsafe extern "C" fn sp_command_bitmap_linear_xor(
     offset: usize,
     bit_vec: *mut SPBitVec,
     compression: SPCompressionCode,
-) -> *mut SPCommand {
+) -> *mut TypedCommand {
     unsafe {
         sp_command_bitmap_linear_internal(
             offset,
@@ -375,22 +366,20 @@ unsafe fn sp_command_bitmap_linear_internal(
     bit_vec: *mut SPBitVec,
     compression: SPCompressionCode,
     operation: BinaryOperation,
-) -> *mut SPCommand {
+) -> *mut TypedCommand {
     assert!(!bit_vec.is_null());
     let bit_vec = unsafe { *Box::from_raw(bit_vec) };
     let compression = match compression.try_into() {
         Ok(compression) => compression,
         Err(_) => return std::ptr::null_mut(),
     };
-    let command = SPCommand(
+    let command =         servicepoint::BitVecCommand {
-        servicepoint::BitVecCommand {
             offset,
             operation,
             bitvec: bit_vec.into(),
             compression,
         }
-        .into(),
+        .into();
-    );
     Box::leak(Box::new(command))
 }
 
@@ -417,16 +406,16 @@ pub unsafe extern "C" fn sp_command_cp437_data(
     x: usize,
     y: usize,
     grid: *mut SPCp437Grid,
-) -> NonNull<SPCommand> {
+) -> NonNull<TypedCommand> {
     assert!(!grid.is_null());
     let grid = *unsafe { Box::from_raw(grid) };
-    let result = Box::new(SPCommand(
+    let result = Box::new(
         servicepoint::Cp437GridCommand {
             origin: servicepoint::Origin::new(x, y),
             grid: grid.0,
         }
         .into(),
-    ));
+    );
     NonNull::from(Box::leak(result))
 }
 
@@ -452,17 +441,17 @@ pub unsafe extern "C" fn sp_command_cp437_data(
 pub unsafe extern "C" fn sp_command_utf8_data(
     x: usize,
     y: usize,
-    grid: *mut SPCharGrid,
+    grid: *mut CharGrid,
-) -> NonNull<SPCommand> {
+) -> NonNull<TypedCommand> {
     assert!(!grid.is_null());
     let grid = unsafe { *Box::from_raw(grid) };
-    let result = Box::new(SPCommand(
+    let result = Box::new(
         servicepoint::CharGridCommand {
             origin: servicepoint::Origin::new(x, y),
-            grid: grid.0,
+            grid,
         }
         .into(),
-    ));
+    );
     NonNull::from(Box::leak(result))
 }
 
@@ -490,23 +479,21 @@ pub unsafe extern "C" fn sp_command_utf8_data(
 pub unsafe extern "C" fn sp_command_bitmap_linear_win(
     x: usize,
     y: usize,
-    bitmap: *mut SPBitmap,
+    bitmap: *mut servicepoint::Bitmap,
     compression: SPCompressionCode,
-) -> *mut SPCommand {
+) -> *mut TypedCommand {
     assert!(!bitmap.is_null());
-    let bitmap = unsafe { *Box::from_raw(bitmap) }.0;
+    let bitmap = unsafe { *Box::from_raw(bitmap) };
     let compression = match compression.try_into() {
         Ok(compression) => compression,
         Err(_) => return std::ptr::null_mut(),
     };
-    let command = SPCommand(
+    let command =         servicepoint::BitmapCommand {
-        servicepoint::BitmapCommand {
             origin: servicepoint::Origin::new(x, y),
             bitmap,
             compression,
         }
-        .into(),
+        .into();
-    );
     Box::leak(Box::new(command))
 }
 
@@ -531,7 +518,7 @@ pub unsafe extern "C" fn sp_command_bitmap_linear_win(
 /// - `command` is not used concurrently or after this call
 /// - `command` was not passed to another consuming function, e.g. to create a [SPPacket]
 #[no_mangle]
-pub unsafe extern "C" fn sp_command_free(command: *mut SPCommand) {
+pub unsafe extern "C" fn sp_command_free(command: *mut TypedCommand) {
     assert!(!command.is_null());
     _ = unsafe { Box::from_raw(command) };
 }

src/connection.rs

@@ -1,22 +1,20 @@
 //! C functions for interacting with [SPConnection]s
 //!
 //! prefix `sp_connection_`
+//!
+//! A connection to the display.
+//!
+//! # Examples
+//!
+//! ```C
+//! CConnection connection = sp_connection_open("172.23.42.29:2342");
+//! if (connection != NULL)
+//!     sp_connection_send_command(connection, sp_command_clear());
+//! ```
 
-use crate::{SPCommand, SPPacket};
+use servicepoint::{Connection, Packet, TypedCommand, UdpConnection};
-use servicepoint::Connection;
 use std::ffi::{c_char, CStr};
 
-/// A connection to the display.
-///
-/// # Examples
-///
-/// ```C
-/// CConnection connection = sp_connection_open("172.23.42.29:2342");
-/// if (connection != NULL)
-///     sp_connection_send_command(connection, sp_command_clear());
-/// ```
-pub struct SPConnection(pub(crate) servicepoint::UdpConnection);
-
 /// Creates a new instance of [SPConnection].
 ///
 /// returns: NULL if connection fails, or connected instance
@@ -34,19 +32,31 @@ pub struct SPConnection(pub(crate) servicepoint::UdpConnection);
 #[no_mangle]
 pub unsafe extern "C" fn sp_connection_open(
     host: *const c_char,
-) -> *mut SPConnection {
+) -> *mut UdpConnection {
     assert!(!host.is_null());
     let host = unsafe { CStr::from_ptr(host) }
         .to_str()
         .expect("Bad encoding");
-    let connection = match servicepoint::UdpConnection::open(host) {
+    let connection = match UdpConnection::open(host) {
         Err(_) => return std::ptr::null_mut(),
         Ok(value) => value,
     };
 
-    Box::into_raw(Box::new(SPConnection(connection)))
+    Box::into_raw(Box::new(connection))
 }
 
+//#[no_mangle]
+//pub unsafe extern "C" fn sp_connection_open_ipv4(
+//    host: SocketAddrV4,
+//) -> *mut SPConnection {
+//    let connection = match servicepoint::UdpConnection::open(host) {
+//        Err(_) => return std::ptr::null_mut(),
+//        Ok(value) => value,
+//    };
+//
+//    Box::into_raw(Box::new(SPConnection(connection)))
+//}
+
 // /// Creates a new instance of [SPUdpConnection] for testing that does not actually send anything.
 // ///
 // /// returns: a new instance. Will never return NULL.
@@ -83,13 +93,13 @@ pub unsafe extern "C" fn sp_connection_open(
 /// - `packet` is not used concurrently or after this call
 #[no_mangle]
 pub unsafe extern "C" fn sp_connection_send_packet(
-    connection: *const SPConnection,
+    connection: *const UdpConnection,
-    packet: *mut SPPacket,
+    packet: *mut Packet,
 ) -> bool {
     assert!(!connection.is_null());
     assert!(!packet.is_null());
     let packet = unsafe { Box::from_raw(packet) };
-    unsafe { (*connection).0.send((*packet).0) }.is_ok()
+    unsafe { (*connection).send(*packet) }.is_ok()
 }
 
 /// Sends a [SPCommand] to the display using the [SPConnection].
@@ -112,13 +122,13 @@ pub unsafe extern "C" fn sp_connection_send_packet(
 /// - `command` is not used concurrently or after this call
 #[no_mangle]
 pub unsafe extern "C" fn sp_connection_send_command(
-    connection: *const SPConnection,
+    connection: *const UdpConnection,
-    command: *mut SPCommand,
+    command: *mut TypedCommand,
 ) -> bool {
     assert!(!connection.is_null());
     assert!(!command.is_null());
-    let command = (*unsafe { Box::from_raw(command) }).0;
+    let command = *unsafe { Box::from_raw(command) };
-    unsafe { (*connection).0.send(command) }.is_ok()
+    unsafe { (*connection).send(command) }.is_ok()
 }
 
 /// Closes and deallocates a [SPConnection].
@@ -134,7 +144,7 @@ pub unsafe extern "C" fn sp_connection_send_command(
 /// - `connection` points to a valid [SPConnection]
 /// - `connection` is not used concurrently or after this call
 #[no_mangle]
-pub unsafe extern "C" fn sp_connection_free(connection: *mut SPConnection) {
+pub unsafe extern "C" fn sp_connection_free(connection: *mut UdpConnection) {
     assert!(!connection.is_null());
     _ = unsafe { Box::from_raw(connection) };
 }

src/cp437_grid.rs

@@ -18,6 +18,7 @@ use std::ptr::NonNull;
 /// sp_cp437_grid_set(grid, 0, 0, '!');
 /// sp_cp437_grid_free(grid);
 /// ```
+#[repr(transparent)]
 pub struct SPCp437Grid(pub(crate) servicepoint::Cp437Grid);
 
 impl Clone for SPCp437Grid {

src/packet.rs

@@ -1,13 +1,12 @@
 //! C functions for interacting with [SPPacket]s
 //!
 //! prefix `sp_packet_`
+//!
+//!
+//! The raw packet
 
 use std::ptr::NonNull;
-
+use servicepoint::{Header, Packet, TypedCommand};
-use crate::SPCommand;
-
-/// The raw packet
-pub struct SPPacket(pub(crate) servicepoint::Packet);
 
 /// Turns a [SPCommand] into a [SPPacket].
 /// The [SPCommand] gets consumed.
@@ -28,12 +27,12 @@ pub struct SPPacket(pub(crate) servicepoint::Packet);
 ///   by explicitly calling `sp_packet_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_packet_from_command(
-    command: *mut SPCommand,
+    command: *mut TypedCommand,
-) -> *mut SPPacket {
+) -> *mut Packet {
     assert!(!command.is_null());
     let command = unsafe { *Box::from_raw(command) };
-    if let Ok(packet) = command.0.try_into() {
+    if let Ok(packet) = command.try_into() {
-        Box::leak(Box::new(SPPacket(packet)))
+        Box::leak(Box::new(packet))
     } else {
         std::ptr::null_mut()
     }
@@ -59,12 +58,12 @@ pub unsafe extern "C" fn sp_packet_from_command(
 pub unsafe extern "C" fn sp_packet_try_load(
     data: *const u8,
     length: usize,
-) -> *mut SPPacket {
+) -> *mut Packet {
     assert!(!data.is_null());
     let data = unsafe { std::slice::from_raw_parts(data, length) };
     match servicepoint::Packet::try_from(data) {
         Err(_) => std::ptr::null_mut(),
-        Ok(packet) => Box::into_raw(Box::new(SPPacket(packet))),
+        Ok(packet) => Box::into_raw(Box::new(packet)),
     }
 }
 
@@ -94,14 +93,10 @@ pub unsafe extern "C" fn sp_packet_try_load(
 ///   by explicitly calling [sp_packet_free].
 #[no_mangle]
 pub unsafe extern "C" fn sp_packet_from_parts(
-    command_code: u16,
+    header: Header,
-    a: u16,
-    b: u16,
-    c: u16,
-    d: u16,
     payload: *const u8,
     payload_len: usize,
-) -> NonNull<SPPacket> {
+) -> NonNull<Packet> {
     assert_eq!(payload.is_null(), payload_len == 0);
 
     let payload = if payload.is_null() {
@@ -112,18 +107,19 @@ pub unsafe extern "C" fn sp_packet_from_parts(
         Vec::from(payload)
     };
 
-    let packet = servicepoint::Packet {
+    let packet = Box::new(Packet {
-        header: servicepoint::Header {
+        header,
-            command_code,
-            a,
-            b,
-            c,
-            d,
-        },
         payload,
-    };
+    });
-    let result = Box::new(SPPacket(packet));
+    NonNull::from(Box::leak(packet))
-    NonNull::from(Box::leak(result))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn sp_packet_get_header(
+    packet: *const Packet,
+) -> Header {
+    assert!(!packet.is_null());
+    unsafe { (*packet).header }
 }
 
 /// Clones a [SPPacket].
@@ -144,10 +140,10 @@ pub unsafe extern "C" fn sp_packet_from_parts(
 ///   by explicitly calling `sp_packet_free`.
 #[no_mangle]
 pub unsafe extern "C" fn sp_packet_clone(
-    packet: *const SPPacket,
+    packet: *const Packet,
-) -> NonNull<SPPacket> {
+) -> NonNull<Packet> {
     assert!(!packet.is_null());
-    let result = Box::new(SPPacket(unsafe { (*packet).0.clone() }));
+    let result = Box::new(unsafe { (*packet).clone() });
     NonNull::from(Box::leak(result))
 }
 
@@ -164,7 +160,7 @@ pub unsafe extern "C" fn sp_packet_clone(
 /// - `packet` points to a valid [SPPacket]
 /// - `packet` is not used concurrently or after this call
 #[no_mangle]
-pub unsafe extern "C" fn sp_packet_free(packet: *mut SPPacket) {
+pub unsafe extern "C" fn sp_packet_free(packet: *mut Packet) {
     assert!(!packet.is_null());
     _ = unsafe { Box::from_raw(packet) }
 }