refactor: 将 DTLS 本地依赖迁移到 libs 目录

libs/dtls/src/extension/renegotiation_info.rs

@@ -0,0 +1,53 @@
+#[cfg(test)]
+mod renegotiation_info_test;
+
+use super::*;
+use crate::error::Error::ErrInvalidPacketLength;
+
+const RENEGOTIATION_INFO_HEADER_SIZE: usize = 5;
+
+/// RenegotiationInfo allows a Client/Server to
+/// communicate their renegotiation support
+///
+/// ## Specifications
+///
+/// * [RFC 5746]
+///
+/// [RFC 5746]: https://tools.ietf.org/html/rfc5746
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct ExtensionRenegotiationInfo {
+    pub(crate) renegotiated_connection: u8,
+}
+
+impl ExtensionRenegotiationInfo {
+    // TypeValue returns the extension TypeValue
+    pub fn extension_value(&self) -> ExtensionValue {
+        ExtensionValue::RenegotiationInfo
+    }
+
+    pub fn size(&self) -> usize {
+        3
+    }
+
+    /// marshal encodes the extension
+    pub fn marshal<W: Write>(&self, writer: &mut W) -> Result<()> {
+        writer.write_u16::<BigEndian>(1)?; //length
+        writer.write_u8(self.renegotiated_connection)?;
+
+        Ok(writer.flush()?)
+    }
+
+    /// Unmarshal populates the extension from encoded data
+    pub fn unmarshal<R: Read>(reader: &mut R) -> Result<Self> {
+        let l = reader.read_u16::<BigEndian>()?; //length
+        if l != 1 {
+            return Err(ErrInvalidPacketLength);
+        }
+
+        let renegotiated_connection = reader.read_u8()?;
+
+        Ok(ExtensionRenegotiationInfo {
+            renegotiated_connection,
+        })
+    }
+}