openpgp: Rename openpgp::constants to openpgp::types.

  - Fixes #381.

1 files changed, 74 insertions, 0 deletions

diff --git a/openpgp/src/types/server_preferences.rs b/openpgp/src/types/server_preferences.rs
new file mode 100644
index 00000000..5567f4a9
--- /dev/null
+++ b/openpgp/src/types/server_preferences.rs
@@ -0,0 +1,74 @@
+use std::fmt;
+
+/// Describes preferences regarding key servers.
+#[derive(Clone, PartialEq, Eq)]
+pub struct KeyServerPreferences{
+    no_modify: bool,
+    unknown: Box<[u8]>,
+}
+
+impl Default for KeyServerPreferences {
+    fn default() -> Self {
+        KeyServerPreferences::new(&[0])
+    }
+}
+
+impl fmt::Debug for KeyServerPreferences {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        if self.no_modify() {
+            f.write_str("no modify")?;
+        }
+
+        Ok(())
+    }
+}
+
+impl KeyServerPreferences {
+    /// Creates a new instance from `bits`.
+    pub fn new(bits: &[u8]) -> Self {
+        let no_mod = bits.get(0)
+            .map(|x| x & KEYSERVER_PREFERENCE_NO_MODIFY != 0).unwrap_or(false);
+        let unk = if bits.is_empty() {
+            Box::default()
+        } else {
+            let mut cpy = Vec::from(bits);
+
+            cpy[0] &= KEYSERVER_PREFERENCE_NO_MODIFY ^ 0xff;
+
+            while cpy.last().cloned() == Some(0) { cpy.pop(); }
+            cpy.into_boxed_slice()
+        };
+
+        KeyServerPreferences{
+            no_modify: no_mod, unknown: unk
+        }
+    }
+
+    /// Returns a slice referencing the raw values.
+    pub(crate) fn as_vec(&self) -> Vec<u8> {
+        let mut ret = if self.unknown.is_empty() {
+            vec![0]
+        } else {
+            self.unknown.clone().into()
+        };
+
+        if self.no_modify { ret[0] |= KEYSERVER_PREFERENCE_NO_MODIFY; }
+
+        ret
+    }
+
+    /// Whether or not keyservers are allowed to modify this key.
+    pub fn no_modify(&self) -> bool {
+        !self.no_modify
+    }
+
+    /// Sets whether or not keyservers are allowed to modify this key.
+    pub fn set_no_modify(mut self, v: bool) -> Self {
+        self.no_modify = v;
+        self
+    }
+}
+
+/// The private component of this key may be in the possession of more
+/// than one person.
+const KEYSERVER_PREFERENCE_NO_MODIFY: u8 = 0x80;