commit e7e6c622082a40d9716a6f4a7b7c1d7554a61be7
Author: pjht <terppa05@gmail.com>
Date:   Tue Nov 1 12:41:41 2022 -0500

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eb5a316
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..bb19628
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,325 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2bfc7e8
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "file_rpc"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+postcard = { version = "1.0.2", default-features = false, features = ["alloc"] }
+serde = { version = "1.0.144", default-features = false, features = ["alloc", "derive"] }
+spin = "0.9.4"
+std = { version = "0.1.0", path = "../std" }
+
+[profile.dev]
+panic="abort"
+
+[profile.release]
+panic="abort"
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..5d56faf
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..fe2e503
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,95 @@
+#![no_std]
+
+use std::{
+    boxed::Box,
+    io,
+    ipc::rpc::{self, IncomingCall},
+    vec::Vec,
+};
+
+use spin::RwLock;
+
+static SERVER: RwLock<Option<Box<dyn Server>>> = RwLock::new(None);
+
+const PROTO: u16 = 1;
+
+pub trait Server: Send + Sync {
+    fn read(&self, fd: u64, pos: u64, len: usize) -> Result<Vec<u8>, io::Error>;
+    fn write(&self, fd: u64, pos: u64, data: &[u8]) -> Result<(), io::Error>;
+    fn close(&self, fd: u64);
+}
+
+#[derive(Copy, Clone)]
+pub struct Client(u64);
+
+impl Client {
+    pub fn new(pid: u64) -> Self {
+        Self(pid)
+    }
+
+    pub fn read(self, fd: u64, pos: u64, len: usize) -> Result<Vec<u8>, io::Error> {
+        postcard::from_bytes(
+            &rpc::send_call(
+                self.0,
+                PROTO,
+                0,
+                &postcard::to_allocvec(&(fd, pos, len)).unwrap(),
+            )
+            .get_return(),
+        )
+        .unwrap()
+    }
+
+    pub fn write(self, fd: u64, pos: u64, data: &[u8]) -> Result<(), io::Error> {
+        postcard::from_bytes(
+            &rpc::send_call(
+                self.0,
+                PROTO,
+                1,
+                &postcard::to_allocvec(&(fd, pos, data)).unwrap(),
+            )
+            .get_return(),
+        )
+        .unwrap()
+    }
+
+    pub fn close(self, fd: u64) {
+        postcard::from_bytes(
+            &rpc::send_call(self.0, PROTO, 2, &postcard::to_allocvec(&fd).unwrap()).get_return(),
+        )
+        .unwrap()
+    }
+}
+
+pub fn register_server(server: Box<dyn Server>) {
+    *SERVER.write() = Some(server);
+    rpc::register_callback(PROTO, callback);
+}
+
+pub fn unregister_server() {
+    rpc::unregister_callback(PROTO);
+    *SERVER.write() = None;
+}
+
+fn callback(call: IncomingCall) {
+    let server_lock = SERVER.read();
+    let server = server_lock.as_ref().unwrap();
+    match call.func {
+        0 => {
+            let (fd, pos, len) = postcard::from_bytes(&call.args).unwrap();
+            let ret = postcard::to_allocvec(&server.read(fd, pos, len)).unwrap();
+            call.send_return(&ret);
+        }
+        1 => {
+            let (fd, pos, data) = postcard::from_bytes(&call.args).unwrap();
+            let ret = postcard::to_allocvec(&server.write(fd, pos, data)).unwrap();
+            call.send_return(&ret);
+        }
+        2 => {
+            let fd = postcard::from_bytes(&call.args).unwrap();
+            let ret = postcard::to_allocvec(&server.close(fd)).unwrap();
+            call.send_return(&ret);
+        }
+        _ => (),
+    }
+}