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a bunch of minor changes combined:

Browse source 
- From instead of Into
- unsafe_data_ref for other payloads
- CByteSlice for returning memory spans
- send Packet instead of Into<Packet>
- expose packet layer to C/C#
This commit is contained in:
Vinzenz Schroeter 2024-05-15 20:34:51 +02:00
parent 5803b71f3a
commit 1dad113ca1
33 changed files with 462 additions and 733 deletions
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11
Cargo.toml Normal file
View file

@ -0,0 +1,11 @@
[workspace]
resolver = "2"
members = [
"servicepoint2",
"servicepoint2-binding-cs",
"examples/announce",
"examples/game_of_life",
"examples/moving_line",
"examples/wiping_clear",
"examples/random_brightness"
]

2
README.md
View file

@ -49,6 +49,7 @@ Uses C bindings internally to provide a similar API to rust. Things to keep in m
- C# specifics are documented in the library. Use the rust documentation for everything else. Naming and semantics are the same apart from CamelCase instead of kebap_case. - C# specifics are documented in the library. Use the rust documentation for everything else. Naming and semantics are the same apart from CamelCase instead of kebap_case.
- You will only get rust backtraces in debug builds of the native code. - You will only get rust backtraces in debug builds of the native code.
- F# is not explicitly tested. If there are usability or functionality problems, please open an issue. - F# is not explicitly tested. If there are usability or functionality problems, please open an issue.
- Reading and writing to instances concurrently is not safe. Only reading concurrently is safe.
```csharp ```csharp
using ServicePoint2; using ServicePoint2;
@ -79,6 +80,7 @@ The lowest common denominator. Things to keep in mind:
- Instances get consumed in the same way they do when writing rust / C# code. Do not use an instance after an (implicit!) free. - Instances get consumed in the same way they do when writing rust / C# code. Do not use an instance after an (implicit!) free.
- Option<T> or Result<T, E> turn into nullable return values - check for NULL! - Option<T> or Result<T, E> turn into nullable return values - check for NULL!
- There are no specifics for C++ here yet. You might get a nicer header when generating directly for C++, but it should be usable. - There are no specifics for C++ here yet. You might get a nicer header when generating directly for C++, but it should be usable.
- Reading and writing to instances concurrently is not safe. Only reading concurrently is safe.
```c++ ```c++
#include <stdio.h> #include <stdio.h>

567
examples/Cargo.lock generated
View file

@ -1,567 +0,0 @@
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9
examples/Cargo.toml
View file

@ -1,9 +0,0 @@
[workspace]
resolver = "2"
members = [
"announce",
"game_of_life",
"moving_line",
"wiping_clear",
"random_brightness"
]

4
examples/announce/src/main.rs
View file

@ -20,7 +20,7 @@ fn main() {
let connection = Connection::open(&cli.destination).unwrap(); let connection = Connection::open(&cli.destination).unwrap();
if cli.clear { if cli.clear {
connection.send(Command::Clear).unwrap(); connection.send(Command::Clear.into()).unwrap();
} }
let mut max_width = 0; let mut max_width = 0;
@ -43,6 +43,6 @@ fn main() {
} }
connection connection
.send(Command::Cp437Data(Origin::top_left(), chars)) .send(Command::Cp437Data(Origin::top_left(), chars).into())
.unwrap(); .unwrap();
} }

2
examples/game_of_life/src/main.rs
View file

@ -23,7 +23,7 @@ fn main() {
loop { loop {
connection connection
.send(Command::BitmapLinearWin(Origin::top_left(), field.clone())) .send(Command::BitmapLinearWin(Origin::top_left(), field.clone()).into())
.expect("could not send"); .expect("could not send");
thread::sleep(Duration::from_millis(14)); thread::sleep(Duration::from_millis(14));
field = iteration(field); field = iteration(field);

4
examples/lang_c/Makefile
View file

@ -3,11 +3,11 @@ OUT_DIR := ${ROOT_DIR}/out
SP2_DIR := ${ROOT_DIR}/../../servicepoint2 SP2_DIR := ${ROOT_DIR}/../../servicepoint2
SP2_INCLUDE := ${ROOT_DIR}/../../servicepoint2-binding-c SP2_INCLUDE := ${ROOT_DIR}/../../servicepoint2-binding-c
SP2_TARGET_RELEASE := ${ROOT_DIR}/../../target/release SP2_TARGET_RELEASE := ${SP2_DIR}/target/release
.PHONY: build run clean .PHONY: build run clean
build: ${OUT_DIR}/lang_c all: ${OUT_DIR}/lang_c
run: ${OUT_DIR}/lang_c run: ${OUT_DIR}/lang_c
out/lang_c out/lang_c

8
examples/lang_c/main.c
View file

@ -8,11 +8,11 @@ int main(void) {
sp2_PixelGrid *pixels = sp2_pixel_grid_new(sp2_PIXEL_WIDTH, sp2_PIXEL_HEIGHT); sp2_PixelGrid *pixels = sp2_pixel_grid_new(sp2_PIXEL_WIDTH, sp2_PIXEL_HEIGHT);
sp2_pixel_grid_fill(pixels, true); sp2_pixel_grid_fill(pixels, true);
sp2_Command *command = sp2_command_bitmap_linear_win(0, 0, pixels); sp2_Command *command = sp2_command_bitmap_linear_win(0, 0, pixels);
if (command == NULL) sp2_Packet *packet = sp2_packet_from_command(command);
return 4; if (!sp2_connection_send(connection, packet))
if (!sp2_connection_send(connection, command)) return 1;
return 5;
sp2_connection_dealloc(connection); sp2_connection_dealloc(connection);
return 0; return 0;

6
examples/lang_cs/Program.cs
View file

@ -2,8 +2,8 @@
using var connection = Connection.Open("127.0.0.1:2342"); using var connection = Connection.Open("127.0.0.1:2342");
connection.Send(Command.Clear()); connection.Send(Command.Clear().IntoPacket());
connection.Send(Command.Brightness(128)); connection.Send(Command.Brightness(128).IntoPacket());
using var pixels = PixelGrid.New(Constants.PixelWidth, Constants.PixelHeight); using var pixels = PixelGrid.New(Constants.PixelWidth, Constants.PixelHeight);
@ -14,6 +14,6 @@ for (var offset = 0; offset < int.MaxValue; offset++)
for (var y = 0; y < pixels.Height; y++) for (var y = 0; y < pixels.Height; y++)
pixels[(y + offset) % Constants.PixelWidth, y] = true; pixels[(y + offset) % Constants.PixelWidth, y] = true;
connection.Send(Command.BitmapLinearWin(0, 0, pixels.Clone())); connection.Send(Command.BitmapLinearWin(0, 0, pixels.Clone()).IntoPacket());
Thread.Sleep(14); Thread.Sleep(14);
} }

2
examples/moving_line/src/main.rs
View file

@ -24,7 +24,7 @@ fn main() {
pixels.set((y + x_offset) % PIXEL_WIDTH as usize, y, true); pixels.set((y + x_offset) % PIXEL_WIDTH as usize, y, true);
} }
connection connection
.send(Command::BitmapLinearWin(Origin::top_left(), pixels.clone())) .send(Command::BitmapLinearWin(Origin::top_left(), pixels.clone()).into())
.unwrap(); .unwrap();
thread::sleep(Duration::from_millis(14)); thread::sleep(Duration::from_millis(14));
} }

6
examples/random_brightness/src/main.rs
View file

@ -30,13 +30,13 @@ fn main() {
let mut filled_grid = PixelGrid::max_sized(); let mut filled_grid = PixelGrid::max_sized();
filled_grid.fill(true); filled_grid.fill(true);
connection connection
.send(BitmapLinearWin(Origin::top_left(), filled_grid)) .send(BitmapLinearWin(Origin::top_left(), filled_grid).into())
.unwrap(); .unwrap();
} }
// set all pixels to the same random brightness // set all pixels to the same random brightness
let mut rng = rand::thread_rng(); let mut rng = rand::thread_rng();
connection.send(Brightness(rng.gen())).unwrap(); connection.send(Brightness(rng.gen()).into()).unwrap();
// continuously update random windows to new random brightness // continuously update random windows to new random brightness
loop { loop {
@ -56,7 +56,7 @@ fn main() {
} }
} }
connection.send(CharBrightness(origin, luma)).unwrap(); connection.send(CharBrightness(origin, luma).into()).unwrap();
std::thread::sleep(wait_duration); std::thread::sleep(wait_duration);
} }
} }

2
examples/wiping_clear/src/main.rs
View file

@ -36,7 +36,7 @@ fn main() {
let bit_vec = BitVec::from(&*pixel_data); let bit_vec = BitVec::from(&*pixel_data);
connection connection
.send(Command::BitmapLinearAnd(0, bit_vec, CompressionCode::Gz)) .send(Command::BitmapLinearAnd(0, bit_vec, CompressionCode::Gz).into())
.unwrap(); .unwrap();
thread::sleep(sleep_duration); thread::sleep(sleep_duration);
} }

86
servicepoint2-binding-c/servicepoint2.h
View file

@ -68,7 +68,7 @@ typedef uint16_t sp2_CompressionCode;
typedef struct sp2_BitVec sp2_BitVec; typedef struct sp2_BitVec sp2_BitVec;
/** /**
* A grid of bytes * A 2D grid of bytes
*/ */
typedef struct sp2_ByteGrid sp2_ByteGrid; typedef struct sp2_ByteGrid sp2_ByteGrid;
@ -82,13 +82,40 @@ typedef struct sp2_Command sp2_Command;
*/ */
typedef struct sp2_Connection sp2_Connection; typedef struct sp2_Connection sp2_Connection;
/**
* The raw packet. Should probably not be used directly.
*/
typedef struct sp2_Packet sp2_Packet;
/** /**
* A grid of pixels stored in packed bytes. * A grid of pixels stored in packed bytes.
*/ */
typedef struct sp2_PixelGrid sp2_PixelGrid; typedef struct sp2_PixelGrid sp2_PixelGrid;
/**
* Represents a `&mut [u8]` as a struct usable by C code.
*
* Usage of this type is inherently unsafe.
*/
typedef struct sp2_CByteSlice {
/**
* The start address of the memory
*/
uint8_t *start;
/**
* The amount of memory in bytes
*/
size_t length;
} sp2_CByteSlice;
/**
* Type alias for documenting the meaning of the u16 in enum values
*/
typedef uint16_t sp2_Offset; typedef uint16_t sp2_Offset;
/**
* Type alias for documenting the meaning of the u16 in enum values
*/
typedef uint8_t sp2_Brightness; typedef uint8_t sp2_Brightness;
#ifdef __cplusplus #ifdef __cplusplus
@ -140,6 +167,19 @@ struct sp2_BitVec *sp2_bit_vec_new(size_t size);
*/ */
bool sp2_bit_vec_set(struct sp2_BitVec *this_, size_t index, bool value); bool sp2_bit_vec_set(struct sp2_BitVec *this_, size_t index, bool value);
/**
* Gets an unsafe reference to the data of the `BitVec` instance.
*
* ## Safety
*
* The caller has to make sure to never access the returned memory after the `BitVec`
* instance has been consumed or manually deallocated.
*
* Reading and writing concurrently to either the original instance or the returned data will
* result in undefined behavior.
*/
struct sp2_CByteSlice sp2_bit_vec_unsafe_data_ref(struct sp2_BitVec *this_);
/** /**
* Clones a `ByteGrid`. * Clones a `ByteGrid`.
* The returned instance has to be freed with `byte_grid_dealloc`. * The returned instance has to be freed with `byte_grid_dealloc`.
@ -166,7 +206,7 @@ uint8_t sp2_byte_grid_get(const struct sp2_ByteGrid *this_, size_t x, size_t y);
/** /**
* Gets the height in pixels of the `ByteGrid` instance. * Gets the height in pixels of the `ByteGrid` instance.
*/ */
size_t sp2_byte_grid_height(const struct sp2_PixelGrid *this_); size_t sp2_byte_grid_height(const struct sp2_ByteGrid *this_);
/** /**
* Loads a `ByteGrid` with the specified dimensions from the provided data. * Loads a `ByteGrid` with the specified dimensions from the provided data.
@ -191,10 +231,23 @@ void sp2_byte_grid_set(struct sp2_ByteGrid *this_,
size_t y, size_t y,
uint8_t value); uint8_t value);
/**
* Gets an unsafe reference to the data of the `ByteGrid` instance.
*
* ## Safety
*
* The caller has to make sure to never access the returned memory after the `ByteGrid`
* instance has been consumed or manually deallocated.
*
* Reading and writing concurrently to either the original instance or the returned data will
* result in undefined behavior.
*/
struct sp2_CByteSlice sp2_byte_grid_unsafe_data_ref(struct sp2_ByteGrid *this_);
/** /**
* Gets the width in pixels of the `ByteGrid` instance. * Gets the width in pixels of the `ByteGrid` instance.
*/ */
size_t sp2_byte_grid_width(const struct sp2_PixelGrid *this_); size_t sp2_byte_grid_width(const struct sp2_ByteGrid *this_);
/** /**
* Allocates a new `Command::BitmapLinear` instance. * Allocates a new `Command::BitmapLinear` instance.
@ -283,6 +336,13 @@ struct sp2_Command *sp2_command_fade_out(void);
*/ */
struct sp2_Command *sp2_command_hard_reset(void); struct sp2_Command *sp2_command_hard_reset(void);
/**
* Tries to turn a `Packet` into a `Command`. The packet is gets deallocated in the process.
*
* Returns: pointer to command or NULL
*/
struct sp2_Command *sp2_command_try_from_packet(struct sp2_Packet *packet);
/** /**
* Tries to load a `Command` from the passed array with the specified length. * Tries to load a `Command` from the passed array with the specified length.
* *
@ -309,7 +369,12 @@ struct sp2_Connection *sp2_connection_open(const char *host);
* Sends the command instance. The instance is consumed / destroyed and cannot be used after this call. * Sends the command instance. The instance is consumed / destroyed and cannot be used after this call.
*/ */
bool sp2_connection_send(const struct sp2_Connection *connection, bool sp2_connection_send(const struct sp2_Connection *connection,
struct sp2_Command *command_ptr); struct sp2_Packet *command_ptr);
/**
* Turns a `Command` into a `Packet`. The command gets deallocated in the process.
*/
struct sp2_Packet *sp2_packet_from_command(struct sp2_Command *command);
/** /**
* Clones a `PixelGrid`. * Clones a `PixelGrid`.
@ -362,6 +427,19 @@ void sp2_pixel_grid_set(struct sp2_PixelGrid *this_,
size_t y, size_t y,
bool value); bool value);
/**
* Gets an unsafe reference to the data of the `PixelGrid` instance.
*
* ## Safety
*
* The caller has to make sure to never access the returned memory after the `PixelGrid`
* instance has been consumed or manually deallocated.
*
* Reading and writing concurrently to either the original instance or the returned data will
* result in undefined behavior.
*/
struct sp2_CByteSlice sp2_pixel_grid_unsafe_data_ref(struct sp2_PixelGrid *this_);
/** /**
* Gets the width in pixels of the `PixelGrid` instance. * Gets the width in pixels of the `PixelGrid` instance.
*/ */

2
servicepoint2-binding-cs/build.rs
View file

@ -8,6 +8,8 @@ fn main() {
.input_extern_file("../servicepoint2/src/connection.rs") .input_extern_file("../servicepoint2/src/connection.rs")
.input_extern_file("../servicepoint2/src/pixel_grid.rs") .input_extern_file("../servicepoint2/src/pixel_grid.rs")
.input_extern_file("../servicepoint2/src/lib.rs") .input_extern_file("../servicepoint2/src/lib.rs")
.input_extern_file("../servicepoint2/src/c_slice.rs")
.input_extern_file("../servicepoint2/src/packet.rs")
.csharp_dll_name("servicepoint2") .csharp_dll_name("servicepoint2")
.csharp_namespace("ServicePoint2.BindGen") .csharp_namespace("ServicePoint2.BindGen")
.csharp_use_nint_types(true) .csharp_use_nint_types(true)

46
servicepoint2-binding-cs/src/BindGen/ServicePoint2.g.cs
View file

@ -50,6 +50,10 @@ namespace ServicePoint2.BindGen
[DllImport(__DllName, EntryPoint = "sp2_bit_vec_len", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_bit_vec_len", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern nuint sp2_bit_vec_len(BitVec* @this); public static extern nuint sp2_bit_vec_len(BitVec* @this);
/// <summary>Gets an unsafe reference to the data of the `BitVec` instance. ## Safety The caller has to make sure to never access the returned memory after the `BitVec` instance has been consumed or manually deallocated. Reading and writing concurrently to either the original instance or the returned data will result in undefined behavior.</summary>
[DllImport(__DllName, EntryPoint = "sp2_bit_vec_unsafe_data_ref", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern CByteSlice sp2_bit_vec_unsafe_data_ref(BitVec* @this);
/// <summary>Creates a new `ByteGrid` instance. The returned instance has to be freed with `byte_grid_dealloc`.</summary> /// <summary>Creates a new `ByteGrid` instance. The returned instance has to be freed with `byte_grid_dealloc`.</summary>
[DllImport(__DllName, EntryPoint = "sp2_byte_grid_new", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_byte_grid_new", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern ByteGrid* sp2_byte_grid_new(nuint width, nuint height); public static extern ByteGrid* sp2_byte_grid_new(nuint width, nuint height);
@ -86,9 +90,13 @@ namespace ServicePoint2.BindGen
[DllImport(__DllName, EntryPoint = "sp2_byte_grid_height", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_byte_grid_height", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern nuint sp2_byte_grid_height(ByteGrid* @this); public static extern nuint sp2_byte_grid_height(ByteGrid* @this);
/// <summary>Tries to load a `Command` from the passed array with the specified length. returns: NULL in case of an error, pointer to the allocated command otherwise</summary> /// <summary>Gets an unsafe reference to the data of the `ByteGrid` instance. ## Safety The caller has to make sure to never access the returned memory after the `ByteGrid` instance has been consumed or manually deallocated. Reading and writing concurrently to either the original instance or the returned data will result in undefined behavior.</summary>
[DllImport(__DllName, EntryPoint = "sp2_command_try_load", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_byte_grid_unsafe_data_ref", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern Command* sp2_command_try_load(byte* data, nuint length); public static extern CByteSlice sp2_byte_grid_unsafe_data_ref(ByteGrid* @this);
/// <summary>Tries to turn a `Packet` into a `Command`. The packet is gets deallocated in the process. Returns: pointer to command or NULL</summary>
[DllImport(__DllName, EntryPoint = "sp2_command_try_from_packet", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern Command* sp2_command_try_from_packet(Packet* packet);
/// <summary>Clones a `Command` instance</summary> /// <summary>Clones a `Command` instance</summary>
[DllImport(__DllName, EntryPoint = "sp2_command_clone", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_command_clone", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
@ -149,7 +157,7 @@ namespace ServicePoint2.BindGen
/// <summary>Sends the command instance. The instance is consumed / destroyed and cannot be used after this call.</summary> /// <summary>Sends the command instance. The instance is consumed / destroyed and cannot be used after this call.</summary>
[DllImport(__DllName, EntryPoint = "sp2_connection_send", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_connection_send", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
[return: MarshalAs(UnmanagedType.U1)] [return: MarshalAs(UnmanagedType.U1)]
public static extern bool sp2_connection_send(Connection* connection, Command* command_ptr); public static extern bool sp2_connection_send(Connection* connection, Packet* command_ptr);
/// <summary>Closes and deallocates a connection instance</summary> /// <summary>Closes and deallocates a connection instance</summary>
[DllImport(__DllName, EntryPoint = "sp2_connection_dealloc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_connection_dealloc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
@ -192,9 +200,21 @@ namespace ServicePoint2.BindGen
[DllImport(__DllName, EntryPoint = "sp2_pixel_grid_height", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_pixel_grid_height", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern nuint sp2_pixel_grid_height(PixelGrid* @this); public static extern nuint sp2_pixel_grid_height(PixelGrid* @this);
/// <summary>Gets a reference to the data of the `PixelGrid` instance.</summary> /// <summary>Gets an unsafe reference to the data of the `PixelGrid` instance. ## Safety The caller has to make sure to never access the returned memory after the `PixelGrid` instance has been consumed or manually deallocated. Reading and writing concurrently to either the original instance or the returned data will result in undefined behavior.</summary>
[DllImport(__DllName, EntryPoint = "sp2_pixel_grid_data_ref", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)] [DllImport(__DllName, EntryPoint = "sp2_pixel_grid_unsafe_data_ref", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern byte* sp2_pixel_grid_data_ref(PixelGrid* @this); public static extern CByteSlice sp2_pixel_grid_unsafe_data_ref(PixelGrid* @this);
/// <summary>Turns a `Command` into a `Packet`. The command gets deallocated in the process.</summary>
[DllImport(__DllName, EntryPoint = "sp2_packet_from_command", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern Packet* sp2_packet_from_command(Command* command);
/// <summary>Tries to load a `Packet` from the passed array with the specified length. returns: NULL in case of an error, pointer to the allocated packet otherwise</summary>
[DllImport(__DllName, EntryPoint = "sp2_packet_try_load", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern Packet* sp2_packet_try_load(byte* data, nuint length);
/// <summary>Deallocates a `Packet`. Note: do not call this if the instance has been consumed in another way, e.g. by sending it.</summary>
[DllImport(__DllName, EntryPoint = "sp2_packet_dealloc", CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
public static extern void sp2_packet_dealloc(Packet* @this);
} }
@ -219,6 +239,18 @@ namespace ServicePoint2.BindGen
{ {
} }
[StructLayout(LayoutKind.Sequential)]
public unsafe partial struct CByteSlice
{
public byte* start;
public nuint length;
}
[StructLayout(LayoutKind.Sequential)]
public unsafe partial struct Packet
{
}
public enum Command public enum Command
{ {

14
servicepoint2-binding-cs/src/BitVec.cs
View file

@ -68,11 +68,23 @@ public sealed class BitVec : Sp2NativeInstance<BindGen.BitVec>
} }
} }
public Span<byte> Data
{
get
{
unsafe
{
var slice = NativeMethods.sp2_bit_vec_unsafe_data_ref(Instance);
return new Span<byte>(slice.start, (int)slice.length);
}
}
}
private unsafe BitVec(BindGen.BitVec* instance) : base(instance) private unsafe BitVec(BindGen.BitVec* instance) : base(instance)
{ {
} }
protected override unsafe void Dealloc() private protected override unsafe void Dealloc()
{ {
NativeMethods.sp2_bit_vec_dealloc(Instance); NativeMethods.sp2_bit_vec_dealloc(Instance);
} }

14
servicepoint2-binding-cs/src/ByteGrid.cs
View file

@ -111,11 +111,23 @@ public sealed class ByteGrid : Sp2NativeInstance<BindGen.ByteGrid>
} }
} }
public Span<byte> Data
{
get
{
unsafe
{
var slice = NativeMethods.sp2_byte_grid_unsafe_data_ref(Instance);
return new Span<byte>(slice.start, (int)slice.length);
}
}
}
private unsafe ByteGrid(BindGen.ByteGrid* instance) : base(instance) private unsafe ByteGrid(BindGen.ByteGrid* instance) : base(instance)
{ {
} }
protected override unsafe void Dealloc() private protected override unsafe void Dealloc()
{ {
NativeMethods.sp2_byte_grid_dealloc(Instance); NativeMethods.sp2_byte_grid_dealloc(Instance);
} }

33
servicepoint2-binding-cs/src/Command.cs
View file

@ -5,6 +5,22 @@ namespace ServicePoint2;
public sealed class Command : Sp2NativeInstance<BindGen.Command> public sealed class Command : Sp2NativeInstance<BindGen.Command>
{ {
public static bool TryFromPacket(Packet packet, [MaybeNullWhen(false)] out Command command)
{
unsafe
{
var result = NativeMethods.sp2_command_try_from_packet(packet.Into());
if (result == null)
{
command = null;
return false;
}
command = new Command(result);
return true;
}
}
public Command Clone() public Command Clone()
{ {
unsafe unsafe
@ -13,21 +29,6 @@ public sealed class Command : Sp2NativeInstance<BindGen.Command>
} }
} }
public static bool TryLoad(Span<byte> bytes, [MaybeNullWhen(false)] out Command command)
{
unsafe
{
fixed (byte* bytesPtr = bytes)
{
var instance = NativeMethods.sp2_command_try_load(bytesPtr, (nuint)bytes.Length);
command = instance == null
? null
: new Command(instance);
return command != null;
}
}
}
public static Command Clear() public static Command Clear()
{ {
unsafe unsafe
@ -124,7 +125,7 @@ public sealed class Command : Sp2NativeInstance<BindGen.Command>
{ {
} }
protected override unsafe void Dealloc() private protected override unsafe void Dealloc()
{ {
NativeMethods.sp2_command_dealloc(Instance); NativeMethods.sp2_command_dealloc(Instance);
} }

6
servicepoint2-binding-cs/src/Connection.cs
View file

@ -16,15 +16,15 @@ public sealed class Connection : Sp2NativeInstance<BindGen.Connection>
} }
} }
public bool Send(Command command) public bool Send(Packet packet)
{ {
unsafe unsafe
{ {
return NativeMethods.sp2_connection_send(Instance, command.Into()); return NativeMethods.sp2_connection_send(Instance, packet.Into());
} }
} }
protected override unsafe void Dealloc() private protected override unsafe void Dealloc()
{ {
NativeMethods.sp2_connection_dealloc(Instance); NativeMethods.sp2_connection_dealloc(Instance);
} }

39
servicepoint2-binding-cs/src/Packet.cs Normal file
View file

@ -0,0 +1,39 @@
using System.Diagnostics.CodeAnalysis;
using ServicePoint2.BindGen;
namespace ServicePoint2;
public sealed class Packet : Sp2NativeInstance<BindGen.Packet>
{
public static Packet FromCommand(Command command)
{
unsafe
{
return new Packet(NativeMethods.sp2_packet_from_command(command.Into()));
}
}
public static bool TryFromBytes(Span<byte> bytes, [MaybeNullWhen(false)] out Packet packet)
{
unsafe
{
fixed (byte* bytesPtr = bytes)
{
var instance = NativeMethods.sp2_packet_try_load(bytesPtr, (nuint)bytes.Length);
packet = instance == null
? null
: new Packet(instance);
return packet != null;
}
}
}
private unsafe Packet(BindGen.Packet* instance) : base(instance)
{
}
private protected override unsafe void Dealloc()
{
NativeMethods.sp2_packet_dealloc(Instance);
}
}

6
servicepoint2-binding-cs/src/PixelGrid.cs
View file

@ -86,8 +86,8 @@ public sealed class PixelGrid : Sp2NativeInstance<BindGen.PixelGrid>
{ {
unsafe unsafe
{ {
var ptr = NativeMethods.sp2_pixel_grid_data_ref(Instance); var slice = NativeMethods.sp2_pixel_grid_unsafe_data_ref(Instance);
return new Span<byte>(ptr, Width * Height / 8); return new Span<byte>(slice.start, (int)slice.length);
} }
} }
} }
@ -96,7 +96,7 @@ public sealed class PixelGrid : Sp2NativeInstance<BindGen.PixelGrid>
{ {
} }
protected override unsafe void Dealloc() private protected override unsafe void Dealloc()
{ {
NativeMethods.sp2_pixel_grid_dealloc(Instance); NativeMethods.sp2_pixel_grid_dealloc(Instance);
} }

16
servicepoint2-binding-cs/src/ServicePoint2Extensions.cs Normal file
View file

@ -0,0 +1,16 @@
using System.Diagnostics.CodeAnalysis;
namespace ServicePoint2;
public static class ServicePoint2Extensions
{
public static Packet IntoPacket(this Command command)
{
return Packet.FromCommand(command);
}
public static bool TryIntoCommand(this Packet packet, [MaybeNullWhen(false)] out Command command)
{
return Command.TryFromPacket(packet, out command);
}
}

2
servicepoint2-binding-cs/src/Sp2NativeInstance.cs
View file

@ -22,7 +22,7 @@ public abstract class Sp2NativeInstance<T>
_instance = instance; _instance = instance;
} }
protected abstract void Dealloc(); private protected abstract void Dealloc();
internal unsafe T* Into() internal unsafe T* Into()
{ {

36
servicepoint2/src/bit_vec.rs
View file

@ -71,14 +71,17 @@ impl BitVec {
self.data.fill(byte); self.data.fill(byte);
} }
/// Gets the length in bits
pub fn len(&self) -> usize { pub fn len(&self) -> usize {
self.data.len() * 8 self.data.len() * 8
} }
pub fn data_ref(&self) -> &[u8] { /// Get the underlying bits in their raw packed bytes form
&*self.data pub fn mut_data_ref(&mut self) -> &mut [u8] {
self.data.as_mut_slice()
} }
/// Calculates the byte index and bitmask for a specific bit in the vector
fn get_indexes(&self, index: usize) -> (usize, u8) { fn get_indexes(&self, index: usize) -> (usize, u8) {
let byte_index = index / 8; let byte_index = index / 8;
let bit_in_byte_index = 7 - index % 8; let bit_in_byte_index = 7 - index % 8;
@ -87,13 +90,15 @@ impl BitVec {
} }
} }
impl Into<Vec<u8>> for BitVec { impl From<BitVec> for Vec<u8> {
fn into(self) -> Vec<u8> { /// Turns the `BitVec` into the underlying `Vec<u8>`
self.data fn from(value: BitVec) -> Self {
value.data
} }
} }
impl From<&[u8]> for BitVec { impl From<&[u8]> for BitVec {
/// Interpret the data as a series of bits and load then into a new `BitVec` instance.
fn from(value: &[u8]) -> Self { fn from(value: &[u8]) -> Self {
Self { Self {
data: Vec::from(value), data: Vec::from(value),
@ -102,6 +107,7 @@ impl From<&[u8]> for BitVec {
} }
impl std::fmt::Debug for BitVec { impl std::fmt::Debug for BitVec {
/// Formats a `BitVec` for debug. The manual implementation includes the length of the instance.
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
fmt.debug_struct("BitVec") fmt.debug_struct("BitVec")
.field("len", &self.len()) .field("len", &self.len())
@ -112,7 +118,7 @@ impl std::fmt::Debug for BitVec {
#[cfg(feature = "c-api")] #[cfg(feature = "c-api")]
pub mod c_api { pub mod c_api {
use crate::BitVec; use crate::{BitVec, CByteSlice};
/// Creates a new `BitVec` instance. /// Creates a new `BitVec` instance.
/// The returned instance has to be freed with `bit_vec_dealloc`. /// The returned instance has to be freed with `bit_vec_dealloc`.
@ -167,4 +173,22 @@ pub mod c_api {
pub unsafe extern "C" fn sp2_bit_vec_len(this: *const BitVec) -> usize { pub unsafe extern "C" fn sp2_bit_vec_len(this: *const BitVec) -> usize {
(*this).len() (*this).len()
} }
/// Gets an unsafe reference to the data of the `BitVec` instance.
///
/// ## Safety
///
/// The caller has to make sure to never access the returned memory after the `BitVec`
/// instance has been consumed or manually deallocated.
///
/// Reading and writing concurrently to either the original instance or the returned data will
/// result in undefined behavior.
#[no_mangle]
pub unsafe extern "C" fn sp2_bit_vec_unsafe_data_ref(this: *mut BitVec) -> CByteSlice {
let data = (*this).mut_data_ref();
CByteSlice {
start: data.as_mut_ptr_range().start,
length: data.len(),
}
}
} }

36
servicepoint2/src/byte_grid.rs
View file

@ -1,7 +1,9 @@
/// A grid of bytes /// A 2D grid of bytes
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
pub struct ByteGrid { pub struct ByteGrid {
/// Size in the x-axis
pub width: usize, pub width: usize,
/// Size in the y-axis
pub height: usize, pub height: usize,
data: Vec<u8>, data: Vec<u8>,
} }
@ -50,18 +52,24 @@ impl ByteGrid {
pub fn fill(&mut self, value: u8) { pub fn fill(&mut self, value: u8) {
self.data.fill(value) self.data.fill(value)
} }
/// Get the underlying byte rows
pub fn mut_data_ref(&mut self) -> &mut [u8] {
self.data.as_mut_slice()
}
} }
impl Into<Vec<u8>> for ByteGrid { impl From<ByteGrid> for Vec<u8> {
fn into(self) -> Vec<u8> { /// Turn into the underlying `Vec<u8>` containing the rows of bytes.
self.data fn from(value: ByteGrid) -> Self {
value.data
} }
} }
#[cfg(feature = "c-api")] #[cfg(feature = "c-api")]
pub mod c_api pub mod c_api
{ {
use crate::ByteGrid; use crate::{ByteGrid, CByteSlice};
/// Creates a new `ByteGrid` instance. /// Creates a new `ByteGrid` instance.
/// The returned instance has to be freed with `byte_grid_dealloc`. /// The returned instance has to be freed with `byte_grid_dealloc`.
@ -122,4 +130,22 @@ pub mod c_api
pub unsafe extern "C" fn sp2_byte_grid_height(this: *const ByteGrid) -> usize { pub unsafe extern "C" fn sp2_byte_grid_height(this: *const ByteGrid) -> usize {
(*this).height (*this).height
} }
/// Gets an unsafe reference to the data of the `ByteGrid` instance.
///
/// ## Safety
///
/// The caller has to make sure to never access the returned memory after the `ByteGrid`
/// instance has been consumed or manually deallocated.
///
/// Reading and writing concurrently to either the original instance or the returned data will
/// result in undefined behavior.
#[no_mangle]
pub unsafe extern "C" fn sp2_byte_grid_unsafe_data_ref(this: *mut ByteGrid) -> CByteSlice {
let data = (*this).mut_data_ref();
CByteSlice {
start: data.as_mut_ptr_range().start,
length: data.len(),
}
}
} }

11
servicepoint2/src/c_slice.rs Normal file
View file

@ -0,0 +1,11 @@
#[cfg(feature = "c-api")]
#[repr(C)]
/// Represents a span of memory (`&mut [u8]` ) as a struct usable by C code.
///
/// Usage of this type is inherently unsafe.
pub struct CByteSlice {
/// The start address of the memory
pub start: *mut u8,
/// The amount of memory in bytes
pub length: usize,
}

81
servicepoint2/src/command.rs
View file

@ -1,7 +1,8 @@
use crate::{ use crate::{
BitVec, ByteGrid, CommandCode, CompressionCode, Header, Packet, PixelGrid, BitVec, ByteGrid, CompressionCode, Header, Packet, PixelGrid,
TILE_SIZE, TILE_SIZE,
}; };
use crate::command_code::CommandCode;
use crate::compression::{into_compressed, into_decompressed}; use crate::compression::{into_compressed, into_decompressed};
/// An origin marks the top left position of a window sent to the display. /// An origin marks the top left position of a window sent to the display.
@ -18,8 +19,10 @@ impl Origin {
#[derive(Debug, Clone, Copy)] #[derive(Debug, Clone, Copy)]
pub struct Size(pub u16, pub u16); pub struct Size(pub u16, pub u16);
/// Type alias for documenting the meaning of the u16 in enum values
pub type Offset = u16; pub type Offset = u16;
/// Type alias for documenting the meaning of the u16 in enum values
pub type Brightness = u8; pub type Brightness = u8;
/// A command to send to the display. /// A command to send to the display.
@ -29,12 +32,14 @@ pub enum Command {
Clear, Clear,
/// Kills the udp daemon, usually results in a reboot of the display. /// Kills the udp daemon, usually results in a reboot of the display.
HardReset, HardReset,
/// Slowly decrease brightness until off? Untested.
FadeOut, FadeOut,
/// Set the brightness of tiles /// Set the brightness of tiles
CharBrightness(Origin, ByteGrid), CharBrightness(Origin, ByteGrid),
/// Set the brightness of all tiles /// Set the brightness of all tiles
Brightness(Brightness), Brightness(Brightness),
#[deprecated] #[deprecated]
/// Legacy command code, gets ignored by the real display.
BitmapLegacy, BitmapLegacy,
/// Set pixel data starting at the offset. /// Set pixel data starting at the offset.
/// The contained BitVec is always uncompressed. /// The contained BitVec is always uncompressed.
@ -54,9 +59,10 @@ pub enum Command {
BitmapLinearWin(Origin, PixelGrid), BitmapLinearWin(Origin, PixelGrid),
} }
impl Into<Packet> for Command { impl From<Command> for Packet {
fn into(self) -> Packet { /// Move the `Command` into a `Packet` instance for sending.
match self { fn from(value: Command) -> Self {
match value {
Command::Clear => command_code_only(CommandCode::Clear), Command::Clear => command_code_only(CommandCode::Clear),
Command::FadeOut => command_code_only(CommandCode::FadeOut), Command::FadeOut => command_code_only(CommandCode::FadeOut),
Command::HardReset => command_code_only(CommandCode::HardReset), Command::HardReset => command_code_only(CommandCode::HardReset),
@ -64,10 +70,9 @@ impl Into<Packet> for Command {
Command::BitmapLegacy => { Command::BitmapLegacy => {
command_code_only(CommandCode::BitmapLegacy) command_code_only(CommandCode::BitmapLegacy)
} }
Command::CharBrightness(origin, grid) => origin_size_payload( Command::CharBrightness(Origin(x, y), grid) => Packet(
CommandCode::CharBrightness, Header(CommandCode::CharBrightness.into(),
origin, x, y, grid.width as u16, grid.height as u16),
Size(grid.width as u16, grid.height as u16),
grid.into(), grid.into(),
), ),
Command::Brightness(brightness) => Packet( Command::Brightness(brightness) => Packet(
@ -126,10 +131,8 @@ impl Into<Packet> for Command {
bits.into(), bits.into(),
) )
} }
Command::Cp437Data(origin, grid) => origin_size_payload( Command::Cp437Data(Origin(x, y), grid) => Packet(
CommandCode::Cp437Data, Header(CommandCode::Cp437Data.into(), x, y, grid.width as u16, grid.height as u16),
origin,
Size(grid.width as u16, grid.height as u16),
grid.into(), grid.into(),
), ),
} }
@ -137,6 +140,7 @@ impl Into<Packet> for Command {
} }
#[derive(Debug)] #[derive(Debug)]
/// Err values for `Command::try_from`.
pub enum TryFromPacketError { pub enum TryFromPacketError {
/// the contained command code does not correspond to a known command /// the contained command code does not correspond to a known command
InvalidCommand(u16), InvalidCommand(u16),
@ -155,6 +159,7 @@ pub enum TryFromPacketError {
impl TryFrom<Packet> for Command { impl TryFrom<Packet> for Command {
type Error = TryFromPacketError; type Error = TryFromPacketError;
/// Try to interpret the `Packet` as one containing a `Command`
fn try_from(value: Packet) -> Result<Self, Self::Error> { fn try_from(value: Packet) -> Result<Self, Self::Error> {
let Packet(Header(command_u16, a, b, c, d), _) = value; let Packet(Header(command_u16, a, b, c, d), _) = value;
let command_code = match CommandCode::try_from(command_u16) { let command_code = match CommandCode::try_from(command_u16) {
@ -178,9 +183,11 @@ impl TryFrom<Packet> for Command {
)); ));
} }
match check_empty_header(header) { let Header(_, a, b, c, d) = header;
Some(err) => Err(err), if a != 0 || b != 0 || c != 0 || d != 0 {
None => Ok(Command::Brightness(payload[0])), Err(TryFromPacketError::ExtraneousHeaderValues)
} else {
Ok(Command::Brightness(payload[0]))
} }
} }
CommandCode::HardReset => match check_command_only(value) { CommandCode::HardReset => match check_command_only(value) {
@ -238,6 +245,7 @@ impl TryFrom<Packet> for Command {
} }
} }
/// Helper method for BitMapLinear*-Commands into Packet
fn bitmap_linear_into_packet( fn bitmap_linear_into_packet(
command: CommandCode, command: CommandCode,
offset: Offset, offset: Offset,
@ -257,30 +265,12 @@ fn bitmap_linear_into_packet(
) )
} }
fn origin_size_payload( /// Helper method for creating empty packets only containing the command code
command: CommandCode,
origin: Origin,
size: Size,
payload: Vec<u8>,
) -> Packet {
let Origin(x, y) = origin;
let Size(w, h) = size;
Packet(Header(command.into(), x, y, w, h), payload.into())
}
fn command_code_only(code: CommandCode) -> Packet { fn command_code_only(code: CommandCode) -> Packet {
Packet(Header(code.into(), 0x0000, 0x0000, 0x0000, 0x0000), vec![]) Packet(Header(code.into(), 0x0000, 0x0000, 0x0000, 0x0000), vec![])
} }
fn check_empty_header(header: Header) -> Option<TryFromPacketError> { /// Helper method for checking that a packet is empty and only contains a command code
let Header(_, a, b, c, d) = header;
if a != 0 || b != 0 || c != 0 || d != 0 {
Some(TryFromPacketError::ExtraneousHeaderValues)
} else {
None
}
}
fn check_command_only(packet: Packet) -> Option<TryFromPacketError> { fn check_command_only(packet: Packet) -> Option<TryFromPacketError> {
let Packet(Header(_, a, b, c, d), payload) = packet; let Packet(Header(_, a, b, c, d), payload) = packet;
if payload.len() != 0 { if payload.len() != 0 {
@ -292,6 +282,7 @@ fn check_command_only(packet: Packet) -> Option<TryFromPacketError> {
} }
} }
/// Helper method for Packets into BitMapLinear*-Commands
fn packet_into_linear_bitmap( fn packet_into_linear_bitmap(
packet: Packet, packet: Packet,
) -> Result<(BitVec, CompressionCode), TryFromPacketError> { ) -> Result<(BitVec, CompressionCode), TryFromPacketError> {
@ -323,21 +314,17 @@ pub mod c_api
use crate::{BitVec, Brightness, ByteGrid, Command, CompressionCode, Offset, Origin, Packet, PixelGrid}; use crate::{BitVec, Brightness, ByteGrid, Command, CompressionCode, Offset, Origin, Packet, PixelGrid};
/// Tries to load a `Command` from the passed array with the specified length.
/// Tries to turn a `Packet` into a `Command`. The packet is gets deallocated in the process.
/// ///
/// returns: NULL in case of an error, pointer to the allocated command otherwise /// Returns: pointer to command or NULL
#[no_mangle] #[no_mangle]
pub unsafe extern "C" fn sp2_command_try_load(data: *const u8, length: usize) -> *mut Command { pub unsafe extern "C" fn sp2_command_try_from_packet(packet: *mut Packet) -> *mut Command {
let data = std::slice::from_raw_parts(data, length); let packet = *Box::from_raw(packet);
let packet = match Packet::try_from(data) { match Command::try_from(packet) {
Err(_) => return null_mut(), Err(_) => return null_mut(),
Ok(packet) => packet Ok(command) => Box::into_raw(Box::new(command)),
}; }
let command = match Command::try_from(packet) {
Err(_) => return null_mut(),
Ok(command) => command,
};
Box::into_raw(Box::new(command))
} }
/// Clones a `Command` instance /// Clones a `Command` instance

16
servicepoint2/src/command_code.rs
View file

@ -1,9 +1,7 @@
use CommandCode::*; /// The u16 command codes used for the `Commands`.
/// The codes used for the commands. See the documentation on the corresponding commands.
#[repr(u16)] #[repr(u16)]
#[derive(Debug, Copy, Clone)] #[derive(Debug, Copy, Clone)]
pub enum CommandCode { pub(crate) enum CommandCode {
Clear = 0x0002, Clear = 0x0002,
Cp437Data = 0x0003, Cp437Data = 0x0003,
CharBrightness = 0x0005, CharBrightness = 0x0005,
@ -19,16 +17,20 @@ pub enum CommandCode {
BitmapLinearXor = 0x0016, BitmapLinearXor = 0x0016,
} }
impl Into<u16> for CommandCode { impl From<CommandCode> for u16 {
fn into(self) -> u16 { /// returns the u16 command code corresponding to the enum value
self as u16 fn from(value: CommandCode) -> Self {
value as u16
} }
} }
impl TryFrom<u16> for CommandCode { impl TryFrom<u16> for CommandCode {
type Error = (); type Error = ();
/// Returns the enum value for the specified `u16` or `Error` if the code is unknown.
fn try_from(value: u16) -> Result<Self, Self::Error> { fn try_from(value: u16) -> Result<Self, Self::Error> {
use CommandCode::*;
match value { match value {
value if value == Clear as u16 => Ok(Clear), value if value == Clear as u16 => Ok(Clear),
value if value == Cp437Data as u16 => Ok(Cp437Data), value if value == Cp437Data as u16 => Ok(Cp437Data),

6
servicepoint2/src/compression_code.rs
View file

@ -15,9 +15,9 @@ pub enum CompressionCode {
Zs = 0x7a73, Zs = 0x7a73,
} }
impl Into<u16> for CompressionCode { impl From<CompressionCode> for u16 {
fn into(self) -> u16 { fn from(value: CompressionCode) -> Self {
self as u16 value as u16
} }
} }

17
servicepoint2/src/connection.rs
View file

@ -42,7 +42,7 @@ impl Connection {
/// .expect("connection failed"); /// .expect("connection failed");
/// ///
/// // turn off all pixels /// // turn off all pixels
/// connection.send(servicepoint2::Command::Clear) /// connection.send(servicepoint2::Command::Clear.into())
/// .expect("send failed"); /// .expect("send failed");
/// ///
/// // turn on all pixels /// // turn on all pixels
@ -50,12 +50,12 @@ impl Connection {
/// pixels.fill(true); /// pixels.fill(true);
/// ///
/// // send pixels to display /// // send pixels to display
/// connection.send(servicepoint2::Command::BitmapLinearWin(servicepoint2::Origin::top_left(), pixels)) /// connection.send(servicepoint2::Command::BitmapLinearWin(servicepoint2::Origin::top_left(), pixels).into())
/// .expect("send failed"); /// .expect("send failed");
/// ``` /// ```
pub fn send( pub fn send(
&self, &self,
packet: impl Into<Packet> + Debug, packet: Packet,
) -> Result<(), std::io::Error> { ) -> Result<(), std::io::Error> {
debug!("sending {packet:?}"); debug!("sending {packet:?}");
let packet: Packet = packet.into(); let packet: Packet = packet.into();
@ -71,7 +71,7 @@ pub mod c_api
use std::ffi::{c_char, CStr}; use std::ffi::{c_char, CStr};
use std::ptr::null_mut; use std::ptr::null_mut;
use crate::{Command, Connection}; use crate::{Connection, Packet};
/// Creates a new instance of Connection. /// Creates a new instance of Connection.
/// The returned instance has to be deallocated with `connection_dealloc`. /// The returned instance has to be deallocated with `connection_dealloc`.
@ -87,15 +87,14 @@ pub mod c_api
Ok(value) => value Ok(value) => value
}; };
let boxed = Box::new(connection); Box::into_raw(Box::new(connection))
Box::into_raw(boxed)
} }
/// Sends the command instance. The instance is consumed / destroyed and cannot be used after this call. /// Sends the command instance. The instance is consumed / destroyed and cannot be used after this call.
#[no_mangle] #[no_mangle]
pub unsafe extern "C" fn sp2_connection_send(connection: *const Connection, command_ptr: *mut Command) -> bool{ pub unsafe extern "C" fn sp2_connection_send(connection: *const Connection, command_ptr: *mut Packet) -> bool{
let command = Box::from_raw(command_ptr); let packet = Box::from_raw(command_ptr);
(*connection).send(*command).is_ok() (*connection).send(*packet).is_ok()
} }
/// Closes and deallocates a connection instance /// Closes and deallocates a connection instance

5
servicepoint2/src/lib.rs
View file

@ -1,12 +1,14 @@
pub use crate::bit_vec::BitVec; pub use crate::bit_vec::BitVec;
pub use crate::byte_grid::ByteGrid; pub use crate::byte_grid::ByteGrid;
pub use crate::command::{Brightness, Command, Offset, Origin, Size}; pub use crate::command::{Brightness, Command, Offset, Origin, Size};
pub use crate::command_code::CommandCode;
pub use crate::compression_code::CompressionCode; pub use crate::compression_code::CompressionCode;
pub use crate::connection::Connection; pub use crate::connection::Connection;
pub use crate::packet::{Header, Packet, Payload}; pub use crate::packet::{Header, Packet, Payload};
pub use crate::pixel_grid::PixelGrid; pub use crate::pixel_grid::PixelGrid;
#[cfg(feature = "c-api")]
pub use crate::c_slice::CByteSlice;
mod bit_vec; mod bit_vec;
mod byte_grid; mod byte_grid;
mod command; mod command;
@ -16,6 +18,7 @@ mod compression_code;
mod connection; mod connection;
mod packet; mod packet;
mod pixel_grid; mod pixel_grid;
mod c_slice;
/// size of a single tile in one dimension /// size of a single tile in one dimension
pub const TILE_SIZE: u16 = 8; pub const TILE_SIZE: u16 = 8;

67
servicepoint2/src/packet.rs
View file

@ -1,3 +1,5 @@
use std::mem::size_of;
/// A raw header. Should probably not be used directly. /// A raw header. Should probably not be used directly.
#[derive(Debug)] #[derive(Debug)]
pub struct Header(pub u16, pub u16, pub u16, pub u16, pub u16); pub struct Header(pub u16, pub u16, pub u16, pub u16, pub u16);
@ -9,12 +11,13 @@ pub type Payload = Vec<u8>;
#[derive(Debug)] #[derive(Debug)]
pub struct Packet(pub Header, pub Payload); pub struct Packet(pub Header, pub Payload);
impl Into<Payload> for Packet { impl From<Packet> for Vec<u8> {
fn into(self) -> Vec<u8> { /// Turn the packet into raw bytes ready to send
let Packet(Header(mode, a, b, c, d), payload) = self; fn from(value: Packet) -> Self {
let Packet(Header(mode, a, b, c, d), payload) = value;
let mut packet = vec![0u8; 10 + payload.len()]; let mut packet = vec![0u8; 10 + payload.len()];
packet[0..=1].copy_from_slice(&u16::to_be_bytes(mode)); packet[0..=1].copy_from_slice(&u16::to_be_bytes(mode.into()));
packet[2..=3].copy_from_slice(&u16::to_be_bytes(a)); packet[2..=3].copy_from_slice(&u16::to_be_bytes(a));
packet[4..=5].copy_from_slice(&u16::to_be_bytes(b)); packet[4..=5].copy_from_slice(&u16::to_be_bytes(b));
packet[6..=7].copy_from_slice(&u16::to_be_bytes(c)); packet[6..=7].copy_from_slice(&u16::to_be_bytes(c));
@ -33,8 +36,17 @@ fn u16_from_be_slice(slice: &[u8]) -> u16 {
u16::from_be_bytes(bytes) u16::from_be_bytes(bytes)
} }
impl From<Payload> for Packet { impl TryFrom<&[u8]> for Packet {
fn from(value: Vec<u8>) -> Self { type Error = ();
/// Tries to interpret the bytes as a `Packet`.
///
/// returns: `Error` if slice is not long enough to be a `Packet`
fn try_from(value: &[u8]) -> Result<Self, Self::Error> {
if value.len() < size_of::<Header>() {
return Err(());
}
let mode = u16_from_be_slice(&value[0..=1]); let mode = u16_from_be_slice(&value[0..=1]);
let a = u16_from_be_slice(&value[2..=3]); let a = u16_from_be_slice(&value[2..=3]);
let b = u16_from_be_slice(&value[4..=5]); let b = u16_from_be_slice(&value[4..=5]);
@ -42,19 +54,42 @@ impl From<Payload> for Packet {
let d = u16_from_be_slice(&value[8..=9]); let d = u16_from_be_slice(&value[8..=9]);
let payload = value[10..].to_vec(); let payload = value[10..].to_vec();
Packet(Header(mode, a, b, c, d), payload) Ok(Packet(Header(mode, a, b, c, d), payload))
} }
} }
impl From<&[u8]> for Packet { #[cfg(feature = "c-api")]
fn from(value: &[u8]) -> Self { mod c_api {
let mode = u16_from_be_slice(&value[0..=1]); use std::ptr::null_mut;
let a = u16_from_be_slice(&value[2..=3]);
let b = u16_from_be_slice(&value[4..=5]);
let c = u16_from_be_slice(&value[6..=7]);
let d = u16_from_be_slice(&value[8..=9]);
let payload = value[10..].to_vec();
Packet(Header(mode, a, b, c, d), payload) use crate::{Command, Packet};
/// Turns a `Command` into a `Packet`. The command gets deallocated in the process.
#[no_mangle]
pub unsafe extern "C" fn sp2_packet_from_command(command: *mut Command) -> *mut Packet {
let command = *Box::from_raw(command);
let packet = command.into();
Box::into_raw(Box::new(packet))
}
/// Tries to load a `Packet` from the passed array with the specified length.
///
/// returns: NULL in case of an error, pointer to the allocated packet otherwise
#[no_mangle]
pub unsafe extern "C" fn sp2_packet_try_load(data: *const u8, length: usize) -> *mut Packet {
let data = std::slice::from_raw_parts(data, length);
match Packet::try_from(data) {
Err(_) => null_mut(),
Ok(packet) => Box::into_raw(Box::new(packet))
}
}
/// Deallocates a `Packet`.
///
/// Note: do not call this if the instance has been consumed in another way, e.g. by sending it.
#[no_mangle]
pub unsafe extern "C" fn sp2_packet_dealloc(this: *mut Packet) {
_ = Box::from_raw(this)
} }
} }

31
servicepoint2/src/pixel_grid.rs
View file

@ -77,20 +77,22 @@ impl PixelGrid {
self.bit_vec.fill(value); self.bit_vec.fill(value);
} }
pub fn data_ref(&self) -> &[u8] { pub fn mut_data_ref(&mut self) -> &mut [u8] {
self.bit_vec.data_ref() self.bit_vec.mut_data_ref()
} }
} }
impl Into<Vec<u8>> for PixelGrid { impl From<PixelGrid> for Vec<u8> {
fn into(self) -> Vec<u8> { /// Turns a `PixelGrid` into the underlying `Vec<u8>`.
self.bit_vec.into() fn from(value: PixelGrid) -> Self {
value.bit_vec.into()
} }
} }
#[cfg(feature = "c-api")] #[cfg(feature = "c-api")]
pub mod c_api pub mod c_api
{ {
use crate::c_slice::CByteSlice;
use crate::PixelGrid; use crate::PixelGrid;
/// Creates a new `PixelGrid` instance. /// Creates a new `PixelGrid` instance.
@ -153,10 +155,21 @@ pub mod c_api
(*this).height (*this).height
} }
/// Gets a reference to the data of the `PixelGrid` instance. /// Gets an unsafe reference to the data of the `PixelGrid` instance.
///
/// ## Safety
///
/// The caller has to make sure to never access the returned memory after the `PixelGrid`
/// instance has been consumed or manually deallocated.
///
/// Reading and writing concurrently to either the original instance or the returned data will
/// result in undefined behavior.
#[no_mangle] #[no_mangle]
pub unsafe extern "C" fn sp2_pixel_grid_data_ref(this: *const PixelGrid) -> *const u8 { pub unsafe extern "C" fn sp2_pixel_grid_unsafe_data_ref(this: *mut PixelGrid) -> CByteSlice {
// TODO: also return length let data = (*this).mut_data_ref();
(*this).data_ref().as_ptr_range().start CByteSlice {
start: data.as_mut_ptr_range().start,
length: data.len(),
}
} }
} }