added fixint support

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "bipack_ru"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 license = "Apache-2.0"
 description = "binary size-effective format used in Divan smart contracts, wasm bindings, network protocols, etc."

README.md

@@ -44,6 +44,10 @@ The autodoc documentation is good enough already, so we do not repeat it here no
 
 - just ad this package to your dependencies, it is on crates.io.
 
+## Big thanks
+
+- to https://github.com/jamesmunns for the brilliant postcard format which was used as a model.
+
 # License
 
 For compliance with other modules this work is provided under APACHE 2.0 license a copy of which is included in the file `LICENSE`.

src/contrail.rs

@@ -18,6 +18,7 @@ pub fn create_contrail(data: &[u8]) -> Vec<u8> {
     result
 }
 
+#[cfg(test)]
 mod tests {
     use crate::contrail::{create_contrail, is_valid_contrail};
 

src/de.rs

@@ -260,7 +260,11 @@ impl<'de, 'a> MapAccess<'de> for SimpleMap<'a> {
     }
 }
 
+#[cfg(test)]
 mod tests {
+    // use std::collections::{HashMap, HashSet};
+    // use std::fmt::Debug;
+
     use std::collections::{HashMap, HashSet};
     use std::fmt::Debug;
 

src/fixint.rs

@@ -0,0 +1,189 @@
+//! # Fixed Size Integers
+//!
+//! In some cases, the use of variably length encoded data may not be
+//! preferrable. These modules, for use with `#[serde(with = ...)]`
+//! "opt out" of variable length encoding.
+//!
+//! Support explicitly not provided for `usize` or `isize`, as
+//! these types would not be portable between systems of different
+//! pointer widths.
+//!
+//! Although all data in Postcard is typically encoded in little-endian
+//! order, these modules provide a choice to the user to encode the data
+//! in either little or big endian form, which may be useful for zero-copy
+//! applications.
+
+use serde::{Deserialize, Serialize, Serializer};
+
+/// Use with the `#[serde(with = "bipack_ru::fixint::le")]` field attribute.
+/// Disables smartint serialization/deserialization for the specified integer
+/// field. The integer will always be serialized in the same way as a fixed
+/// size array, in **Little Endian** order on the wire.
+///
+/// ```rust
+/// # use serde::Serialize;
+/// #[derive(Serialize)]
+/// pub struct DefinitelyLittleEndian {
+///     #[serde(with = "bipack_ru::fixint::le")]
+///     x: u16,
+/// }
+/// ```
+pub mod le {
+    use serde::{Deserialize, Deserializer, Serialize, Serializer};
+
+    use super::LE;
+
+    /// Serialize the integer value as a little-endian fixed-size array.
+    pub fn serialize<S, T>(val: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        T: Copy,
+        LE<T>: Serialize,
+    {
+        LE(*val).serialize(serializer)
+    }
+
+    /// Deserialize the integer value from a little-endian fixed-size array.
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        LE<T>: Deserialize<'de>,
+    {
+        LE::<T>::deserialize(deserializer).map(|x| x.0)
+    }
+}
+
+/// Use with the `#[serde(with = "bipack_ru::fixint::be")]` field attribute.
+/// Disables smartint serialization/deserialization for the specified integer
+/// field. The integer will always be serialized in the same way as a fixed
+/// size array, in **Big Endian** order on the wire.
+///
+/// ```rust
+/// # use serde::Serialize;
+/// #[derive(Serialize)]
+/// pub struct DefinitelyBigEndian {
+///     #[serde(with = "bipack_ru::fixint::be")]
+///     x: u16,
+/// }
+/// ```
+pub mod be {
+    use serde::{Deserialize, Deserializer, Serialize, Serializer};
+
+    use super::BE;
+
+    /// Serialize the integer value as a big-endian fixed-size array.
+    pub fn serialize<S, T>(val: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        T: Copy,
+        BE<T>: Serialize,
+    {
+        BE(*val).serialize(serializer)
+    }
+
+    /// Deserialize the integer value from a big-endian fixed-size array.
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        BE<T>: Deserialize<'de>,
+    {
+        BE::<T>::deserialize(deserializer).map(|x| x.0)
+    }
+}
+
+#[doc(hidden)]
+pub struct LE<T>(T);
+
+#[doc(hidden)]
+pub struct BE<T>(T);
+
+macro_rules! impl_fixint {
+    ($( $int:ty ),*) => {
+        $(
+            impl Serialize for LE<$int> {
+                #[inline]
+                fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+                where
+                    S: Serializer,
+                {
+                    self.0.to_le_bytes().serialize(serializer)
+                }
+            }
+
+            impl<'de> Deserialize<'de> for LE<$int> {
+                #[inline]
+                fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+                where
+                    D: serde::Deserializer<'de>,
+                {
+                    <_ as Deserialize>::deserialize(deserializer)
+                        .map(<$int>::from_le_bytes)
+                        .map(Self)
+                }
+            }
+
+            impl Serialize for BE<$int> {
+                #[inline]
+                fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+                where
+                    S: Serializer,
+                {
+                    self.0.to_be_bytes().serialize(serializer)
+                }
+            }
+
+            impl<'de> Deserialize<'de> for BE<$int> {
+                #[inline]
+                fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+                where
+                    D: serde::Deserializer<'de>,
+                {
+                    <_ as Deserialize>::deserialize(deserializer)
+                        .map(<$int>::from_be_bytes)
+                        .map(Self)
+                }
+            }
+        )*
+    };
+}
+
+impl_fixint![i16, i32, i64, i128, u16, u32, u64, u128];
+
+#[cfg(test)]
+mod tests {
+    use serde::{Deserialize, Serialize};
+    use crate::de::from_bytes;
+    use crate::ser::to_bytes;
+
+    #[test]
+    fn test_little_endian() {
+        #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
+        pub struct DefinitelyLE {
+            #[serde(with = "crate::fixint::le")]
+            x: u16,
+        }
+
+        let input = DefinitelyLE { x: 0xABCD };
+        let serialized = to_bytes(&input).unwrap();
+        assert_eq!(serialized, &[0xCD, 0xAB]);
+
+        let deserialized: DefinitelyLE = from_bytes(&serialized).unwrap();
+        assert_eq!(deserialized, input);
+    }
+
+    #[test]
+    fn test_big_endian() {
+        #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
+        pub struct DefinitelyBE {
+            #[serde(with = "crate::fixint::be")]
+            x: u16,
+        }
+
+        let input = DefinitelyBE { x: 0xABCD };
+        let serialized = to_bytes(&input).unwrap();
+        assert_eq!(serialized, &[0xAB, 0xCD]);
+
+        let deserialized: DefinitelyBE = from_bytes(&serialized).unwrap();
+        assert_eq!(deserialized, input);
+    }
+}

src/lib.rs

@@ -118,11 +118,12 @@ pub mod bipack_source;
 pub mod bipack_sink;
 pub mod tools;
 pub mod bipack;
-mod error;
-mod ser;
-mod de;
-mod crc;
-mod contrail;
+pub mod error;
+pub mod ser;
+pub mod de;
+pub mod crc;
+pub mod contrail;
+pub mod fixint;
 
 #[cfg(test)]
 mod tests {

src/ser.rs

@@ -1,12 +1,7 @@
-use std::collections::HashMap;
-use std::string::FromUtf8Error;
-
 use serde::{ser, Serialize};
 
 use crate::bipack_sink::{BipackSink, IntoU64};
-use crate::bipack_source::{BipackError, BipackSource, SliceSource};
 use crate::error::{Error, Result};
-use crate::tools::{to_dump, to_hex};
 
 pub struct Serializer {
     // This string starts empty and JSON is appended as values are serialized.
@@ -159,7 +154,8 @@ impl<'a> ser::Serializer for &'a mut Serializer {
     }
 
     fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
-        self.serialize_seq(Some(len))
+        Ok(self)
+        // self.serialize_seq(Some(len))
     }
 
     fn serialize_tuple_struct(
@@ -342,6 +338,18 @@ impl<'a> ser::SerializeStructVariant for &'a mut Serializer {
     }
 }
 
+#[cfg(test)]
+mod test {
+    use std::collections::HashMap;
+    use std::string::FromUtf8Error;
+
+    use serde::Serialize;
+
+    use crate::bipack_source::{BipackError, BipackSource, SliceSource};
+    use crate::error;
+    use crate::ser::to_bytes;
+    use crate::tools::{to_dump, to_hex};
+
     #[test]
     fn test_struct() -> std::result::Result<(), BipackError> {
         #[derive(Serialize)]
@@ -409,8 +417,7 @@ fn test_enum() -> std::result::Result<(), FromUtf8Error> {
     }
 
     #[test]
-fn test_map() -> Result<()> {
-
+    fn test_map() -> error::Result<()> {
         let mut src = HashMap::new();
         src.insert("foo", 1);
         src.insert("foo", 42);
@@ -420,3 +427,4 @@ fn test_map() -> Result<()> {
         println!("{}", to_dump(&packed));
         Ok(())
     }
+}