Attempt to add DBus, it compiles but I did not achive a conversion (in either direction)

Cargo.lock

@@ -288,6 +288,17 @@ dependencies = [
  "sha1",
 ]
 
+[[package]]
+name = "proc-macro-crate"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eda0fc3b0fb7c975631757e14d9049da17374063edb6ebbcbc54d880d4fe94e9"
+dependencies = [
+ "once_cell",
+ "thiserror",
+ "toml",
+]
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -457,6 +468,12 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "strsim"
 version = "0.10.0"
@@ -509,10 +526,20 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "toml"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d82e1a7758622a465f8cee077614c73484dac5b836c02ff6a40d5d1010324d7"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "tradaf"
 version = "0.1.0"
 dependencies = [
+ "byteorder",
  "clap",
  "json5",
  "rmp-serde",
@@ -523,6 +550,7 @@ dependencies = [
  "serde_json",
  "serde_qs",
  "serde_yaml",
+ "zvariant",
 ]
 
 [[package]]
@@ -585,3 +613,28 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "zvariant"
+version = "3.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bd68e4e6432ef19df47d7e90e2e72b5e7e3d778e0ae3baddf12b951265cc758"
+dependencies = [
+ "byteorder",
+ "libc",
+ "serde",
+ "static_assertions",
+ "zvariant_derive",
+]
+
+[[package]]
+name = "zvariant_derive"
+version = "3.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08e977eaa3af652f63d479ce50d924254ad76722a6289ec1a1eac3231ca30430"
+dependencies = [
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn",
+]

Cargo.toml

@@ -16,11 +16,11 @@ edition = "2021"
 [dependencies]
 # TODO: handle errors (or pass them to main) instead of unwrapping
 #anyhow = "1.0.64"
-clap = { version = "3.2.20", features = ["derive"] }
+clap = { version = "3.2", features = ["derive"] }
 # TODO: May be used to "deserialize any" if I understood correctly. (Or maybe `typetag`?) But I did not achieved to make it work with serde-transcode
 #erased-serde = "0.3.23"
 serde = "1.0"
-serde-transcode = "1.1.1"
+serde-transcode = "1.1"
 
 # Data types we support
 # Should tend to be equal to the official list of data formats supported by serde: https://serde.rs/#data-formats
@@ -37,4 +37,5 @@ rmp-serde = "1.1"
 ron = "0.8"
 #toml = "0.5"
 serde_yaml = "0.9"
- 
+zvariant = "3.6" # D-Bus & GVariant  # TODO: try to implement it with the from signature?
+  byteorder = "1.3" # required by zvariant

src/lib.rs

@@ -1,6 +1,9 @@
 use clap::{Parser, ValueEnum};
 use serde::de::Deserializer;
-use std::io::{Read, Write};
+use std::{
+    convert::TryFrom,
+    io::{Read, Write},
+};
 
 #[derive(Debug, Parser)]
 #[clap(author, version, about, long_about = None)]
@@ -12,6 +15,11 @@ pub struct Opt {
     #[clap(value_enum, ignore_case = true)]
     pub output: Output,
 
+    #[clap(long, short = 'F')]
+    pub format_in: Option<String>,
+    #[clap(long, short = 'f', required_if_eq_any(&[("output", "d-bus")]))]
+    pub format_out: Option<String>,
+
     /// For data format compatible, a default pretty format is output instead of a minified one
     /// Output a pretty formated data instead of minified, only for format compatible
     #[clap(long, short)]
@@ -25,6 +33,7 @@ pub struct Opt {
 pub enum Input {
     //Bson,
     //Cbor,
+    DBus,
     Json,
     Json5,
     //SExpression,
@@ -40,6 +49,8 @@ pub enum Input {
 pub enum Output {
     //Bson,
     //Cbor,
+    //#[clap(requires("format_out"))]
+    DBus,
     Json,
     //Json5,    // NOTE: The crate is not noted "(deserialization only)" on the [serde listing](https://serde.rs/#data-formats) but it does not expose a `Serializer`
     //SExpression,
@@ -78,6 +89,24 @@ fn de(opt: &Opt, input: &mut dyn Read, output: &mut dyn Write) {
             ser(opt, deserializer, output);
         }
         */
+        Input::DBus => {
+            use zvariant::dbus::Deserializer;
+            use zvariant::EncodingContext;
+            use zvariant::Signature;
+
+            use byteorder::LE;
+
+            let sig = opt.format_in.clone().unwrap();
+            let mut buf = String::new();
+            let _buf_size = input.read_to_string(&mut buf).unwrap();
+            let mut deserializer = Deserializer::new(
+                buf.as_bytes(),
+                None,
+                &Signature::try_from(sig).unwrap(),
+                EncodingContext::<LE>::new_dbus(0),
+            );
+            ser(opt, &mut deserializer, output);
+        }
         Input::Json => {
             use serde_json::Deserializer;
 
@@ -149,6 +178,28 @@ where
             serde_transcode::transcode(deserializer, serializer).unwrap();
         }
         */
+        Output::DBus => {
+            use zvariant::dbus::Serializer;
+            use zvariant::EncodingContext;
+            use zvariant::Signature;
+
+            use byteorder::LE;
+
+            let sig = opt.format_out.clone().unwrap();
+            let mut out = std::io::Cursor::new(vec![]);
+            let mut fs = vec![];
+            let serializer = &mut Serializer::new(
+                &Signature::try_from(dbg!(sig)).unwrap(),
+                &mut out,
+                &mut fs, //None,
+                EncodingContext::<LE>::new_dbus(0),
+            );
+
+            //let mut buf = String::new();
+            //           let _buf_size = output.read_to_string(&mut buf).unwrap();
+            //            let mut deserializer = Deserializer::new();
+            serde_transcode::transcode(deserializer, serializer).unwrap();
+        }
         Output::Json => {
             use serde_json::Serializer;