From 9866c0f34c268a09ecaaa9a4361c1c267799358e Mon Sep 17 00:00:00 2001
From: Graham Northup <grissess@nexusg.org>
Date: Tue, 19 Sep 2017 23:56:15 -0400
Subject: Starting work on proto decode

---
 src/proto.rs | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/proto.rs

(limited to 'src/proto.rs')

diff --git a/src/proto.rs b/src/proto.rs
new file mode 100644
index 0000000..06d7b49
--- /dev/null
+++ b/src/proto.rs
@@ -0,0 +1,58 @@
+use std::mem;
+use std::time::Duration;
+use super::*;
+
+use ::byteorder::{ByteOrder, NetworkEndian};
+
+const OBLIGATE_POLYPHONE: u32 = 0xffffffff;
+
+pub enum Command {
+    KeepAlive,
+    Ping{data: [u8; 32]},
+    Quit,
+    Play{sec: u32, usec: u32, freq: u32, amp: f32, voice: u32},
+    Caps{voices: u32, tp: [u8; 4], ident: [u8; 24]},
+    PCM{samples: [i16; 16]},
+    Unknown{data: [u8; 36]},
+}
+
+impl Command {
+    const SIZE: usize = 36;
+
+    fn duration(&self) -> Option<Duration> {
+        match *self {
+            Command::Play{sec, usec, ..} => Some(Duration::new(sec as u64, usec * 1000)),
+            _ => None,
+        }
+    }
+
+    fn pitch(&self) -> Option<Pitch> {
+        match *self {
+            Command::Play{freq, ..} => Some(Pitch::Freq(freq as f32)),
+            _ => None,
+        }
+    }
+}
+
+impl<'a> From<&'a [u8; 36]> for Command {
+    fn from(packet: &'a [u8; 36]) -> Command {
+        let mut fields_u32: [u32; 9] = unsafe { mem::uninitialized() };
+        let mut fields_f32: [f32; 9] = unsafe { mem::uninitialized() };
+        NetworkEndian::read_u32_into(packet, &mut fields_u32);
+        unsafe { NetworkEndian::read_f32_into_unchecked(packet, &mut fields_f32); }
+
+        match fields_u32[0] {
+            0 => Command::KeepAlive,
+            1 => {
+                let mut data: [u8; 32] = unsafe { mem::uninitialized() };
+                data.copy_from_slice(&packet[4..]);
+                Command::Ping{data: data}
+            }
+            _ => {
+                let mut data: [u8; 36] = unsafe { mem::uninitialized() };
+                data.copy_from_slice(packet);
+                Command::Unknown{data: data}
+            }
+        }
+    }
+}
-- 
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