Add temporary hash function.

examples/hashtest.rs

@@ -0,0 +1,22 @@
+use unshell::hash;
+
+macro_rules! hashtest {
+    ($input:tt) => {
+        ($input, hash($input))
+    };
+}
+
+const MAP: [(&'static str, u32); 6] = [
+    hashtest!("abc123"),
+    hashtest!("abc124"),
+    hashtest!("abc125"),
+    hashtest!("abc122"),
+    hashtest!("somethingelse"),
+    hashtest!("org.io.abc1234"),
+];
+
+pub fn main() {
+    for (a, b) in MAP {
+        println!("unshell::hash(\"{}\") = {}", a, b)
+    }
+}

src/hash.rs

@@ -0,0 +1,57 @@
+//! Temporary hash function
+
+const fn hash_recursive<'a>(state: &mut [u8; 4], input: &'a [u8]) {
+    match input.len() {
+        3 => {
+            state[0] ^= input[0];
+            state[1] ^= input[1];
+            state[2] ^= input[2];
+        }
+        2 => {
+            state[0] ^= input[0];
+            state[1] ^= input[1];
+        }
+        1 => {
+            state[0] ^= input[0];
+        }
+        0 => {}
+        _ => {
+            state[0] ^= input[0];
+            state[1] ^= input[1];
+            state[2] ^= input[2];
+            state[3] ^= input[3];
+
+            // Mess with the state quite a bit
+            state[0] = u8::reverse_bits(state[0]) ^ state[2];
+            state[2] = state[0].wrapping_add(state[2]).wrapping_add(state[3]) ^ state[0];
+            state[3] = state[2].wrapping_add(state[3] << 2) ^ state[1];
+            state[1] = state[3] ^ 0xa3;
+
+            hash_recursive(state, &input[1..]);
+        }
+    }
+}
+
+pub const fn hash(input: &'static str) -> u32 {
+    let mut data = [0xDE, 0xED, 0xBE, 0xEF];
+    hash_recursive(&mut data, input.as_bytes());
+
+    // throw the data back into itself because why not
+    let input2 = [
+        u8::reverse_bits(data[1]),
+        data[2],
+        data[2],
+        data[1],
+        u8::reverse_bits(data[0]),
+        data[2],
+        u8::reverse_bits(data[3]),
+        u8::reverse_bits(data[2]),
+        data[3],
+        u8::reverse_bits(data[3]),
+        u8::reverse_bits(data[2]),
+        data[0],
+    ];
+    hash_recursive(&mut data, &input2);
+
+    u32::from_be_bytes(data)
+}

src/lib.rs

@@ -10,9 +10,12 @@
 //! The library requires `alloc` for path and payload management.
 
 #![no_std]
+#![feature(const_index)]
+#![feature(const_trait_impl)]
 
 pub extern crate alloc;
 
+mod hash;
 pub mod logger;
 
 pub mod protocol {
@@ -20,3 +23,5 @@ pub mod protocol {
 
     pub use unshell_macros::unshell_leaf;
 }
+
+pub use hash::hash;

unshell-leaves/leaf-pty/src/constants.rs

@@ -1,8 +1,8 @@
 /// Leaf id used by the generated fake PTY wrapper.
-pub const LEAF_FAKE_PTY: u32 = 300;
+pub const LEAF_FAKE_PTY: u32 = unshell::hash("dev.unshell.v1.pty");
 
 /// Outer procedure id used by all fake PTY session packets.
-pub const PROC_PTY: u32 = 30;
+pub const PROC_PTY: u32 = unshell::hash("dev.unshell.v1.pty.pty");
 
 /// Downward opcode that opens one PTY session.
 pub const OP_OPEN: u8 = 0;