impls for null-terminated FFI string types

serde/src/de/impls.rs

@@ -25,6 +25,8 @@ use std::net;
 #[cfg(feature = "std")]
 use std::path;
 use core::str;
+#[cfg(feature = "std")]
+use std::ffi::CString;
 
 #[cfg(feature = "std")]
 use std::rc::Rc;
@@ -53,6 +55,9 @@ use de::{Deserialize, Deserializer, EnumVisitor, Error, MapVisitor, SeqVisitor,
          VariantVisitor, Visitor};
 use de::from_primitive::FromPrimitive;
 
+#[cfg(feature = "std")]
+use bytes::ByteBuf;
+
 ///////////////////////////////////////////////////////////////////////////////
 
 /// A visitor that produces a `()`.
@@ -295,6 +300,19 @@ impl Deserialize for String {
 
 ///////////////////////////////////////////////////////////////////////////////
 
+#[cfg(feature = "std")]
+impl Deserialize for CString {
+    fn deserialize<D>(deserializer: D) -> Result<CString, D::Error>
+        where D: Deserializer
+    {
+        let v: Vec<u8> = try!(ByteBuf::deserialize(deserializer)).into();
+        CString::new(v)
+            .map_err(|e| Error::custom(format!("unexpected NULL at byte {}", e.nul_position())))
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 struct OptionVisitor<T> {
     marker: PhantomData<T>,
 }

serde/src/ser/impls.rs

@@ -22,6 +22,8 @@ use core::ops;
 #[cfg(feature = "std")]
 use std::path;
 #[cfg(feature = "std")]
+use std::ffi::{CString, CStr};
+#[cfg(feature = "std")]
 use std::rc::Rc;
 #[cfg(all(feature = "alloc", not(feature = "std")))]
 use alloc::rc::Rc;
@@ -98,6 +100,28 @@ impl Serialize for String {
 
 ///////////////////////////////////////////////////////////////////////////////
 
+#[cfg(feature = "std")]
+impl Serialize for CStr {
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        serializer.serialize_bytes(self.to_bytes())
+    }
+}
+
+#[cfg(feature = "std")]
+impl Serialize for CString {
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        serializer.serialize_bytes(self.to_bytes())
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 impl<T> Serialize for Option<T>
     where T: Serialize
 {

test_suite/tests/test_de.rs

@@ -6,6 +6,7 @@ use std::net;
 use std::path::PathBuf;
 use std::time::Duration;
 use std::default::Default;
+use std::ffi::CString;
 
 extern crate serde;
 use serde::Deserialize;
@@ -878,6 +879,11 @@ declare_tests! {
             Token::String("/usr/local/lib".to_owned()),
         ],
     }
+    test_cstring {
+        CString::new("abc").unwrap() => &[
+            Token::Bytes(b"abc"),
+        ],
+    }
 }
 
 #[cfg(feature = "unstable")]
@@ -995,4 +1001,16 @@ declare_error_tests! {
         ],
         Error::Message("invalid length 1, expected an array of length 3".into()),
     }
+    test_cstring_internal_null<CString> {
+        &[
+            Token::Bytes(b"a\0c"),
+        ],
+        Error::Message("unexpected NULL at byte 1".into()),
+    }
+    test_cstring_internal_null_end<CString> {
+        &[
+            Token::Bytes(b"ac\0"),
+        ],
+        Error::Message("unexpected NULL at byte 2".into()),
+    }
 }

test_suite/tests/test_ser.rs

@@ -6,6 +6,7 @@ use std::net;
 use std::path::{Path, PathBuf};
 use std::str;
 use std::time::Duration;
+use std::ffi::CString;
 
 extern crate serde;
 
@@ -389,6 +390,16 @@ declare_tests! {
             Token::Str("/usr/local/lib"),
         ],
     }
+    test_cstring {
+        CString::new("abc").unwrap() => &[
+            Token::Bytes(b"abc"),
+        ],
+    }
+    test_cstr {
+        (&*CString::new("abc").unwrap()) => &[
+            Token::Bytes(b"abc"),
+        ],
+    }
 }