1 files changed, 67 insertions, 0 deletions
diff --git a/src/count.rs b/src/count.rs
new file mode 100644
index 0000000..c3d92bf
--- /dev/null
+++ b/src/count.rs
@@ -0,0 +1,67 @@
+const U16_MAX: usize = u16::MAX as usize;
+
+pub struct Count {
+	tcp_tx: Box<[usize]>,
+	tcp_rx: Box<[usize]>,
+	udp_tx: Box<[usize]>,
+	udp_rx: Box<[usize]>,
+}
+
+impl Count {
+	pub fn new() -> Self {
+		Self {
+			tcp_tx: Box::new([0; U16_MAX]),
+			tcp_rx: Box::new([0; U16_MAX]),
+			udp_tx: Box::new([0; U16_MAX]),
+			udp_rx: Box::new([0; U16_MAX]),
+		}
+	}
+
+	pub fn push_tcp(&mut self, tx_flag: bool, src: u16, dst: u16, len: usize) {
+		// The unsafe code here is bad and not good. As far as I am aware, this
+		// is safe except for allowing race conditions.
+		if tx_flag {
+			let bad_mut = unsafe { &mut *(self.tcp_tx.as_ptr() as *mut [usize; U16_MAX]) };
+			bad_mut[src as usize] += len;
+		} else {
+			let bad_mut = unsafe { &mut *(self.tcp_rx.as_ptr() as *mut [usize; U16_MAX]) };
+			bad_mut[dst as usize] += len;
+		}
+	}
+
+	pub fn push_udp(&mut self, tx_flag: bool, src: u16, dst: u16, len: usize) {
+		// The unsafe code here is bad and not good. As far as I am aware, this
+		// is safe except for allowing race conditions.
+		if tx_flag {
+			let bad_mut = unsafe { &mut *(self.udp_tx.as_ptr() as *mut [usize; U16_MAX]) };
+			bad_mut[src as usize] += len;
+		} else {
+			let bad_mut = unsafe { &mut *(self.udp_rx.as_ptr() as *mut [usize; U16_MAX]) };
+			bad_mut[dst as usize] += len;
+		}
+	}
+
+	pub fn tcp_tx(&self, port: u16) -> usize {
+		self.tcp_tx[port as usize]
+	}
+
+	pub fn tcp_rx(&self, port: u16) -> usize {
+		self.tcp_rx[port as usize]
+	}
+
+	pub fn udp_tx(&self, port: u16) -> usize {
+		self.udp_tx[port as usize]
+	}
+
+	pub fn udp_rx(&self, port: u16) -> usize {
+		self.udp_rx[port as usize]
+	}
+
+	pub fn many_tcp_tx(&self, ports: &[u16]) -> usize {
+		ports.iter().fold(0, |acc, port| acc + self.tcp_tx[*port as usize])
+	}
+
+	pub fn many_tcp_rx(&self, ports: &[u16]) -> usize {
+		ports.iter().fold(0, |acc, port| acc + self.tcp_rx[*port as usize])
+	}
+}