From 2af68aa7030eb84a616affd35aa581a94b1d71a8 Mon Sep 17 00:00:00 2001
From: Jakub Kotur <qtr@google.com>
Date: Mon, 21 Dec 2020 17:28:16 +0100
Subject: Initial import of serde_cbor-0.11.1

Bug: 155309706
Change-Id: I76f4c8f21175d62b941d8a6fc6d80d86f93e84f3
---
 examples/readme.rs | 39 +++++++++++++++++++++++++
 examples/tags.rs   | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 examples/tux.cbor  |  1 +
 3 files changed, 124 insertions(+)
 create mode 100644 examples/readme.rs
 create mode 100644 examples/tags.rs
 create mode 100644 examples/tux.cbor

(limited to 'examples')

diff --git a/examples/readme.rs b/examples/readme.rs
new file mode 100644
index 0000000..7689394
--- /dev/null
+++ b/examples/readme.rs
@@ -0,0 +1,39 @@
+// NOTE: This file should be kept in sync with README.md
+
+use serde_derive::{Deserialize, Serialize};
+use std::error::Error;
+use std::fs::File;
+
+// Types annotated with `Serialize` can be stored as CBOR.
+// To be able to load them again add `Deserialize`.
+#[derive(Debug, Serialize, Deserialize)]
+struct Mascot {
+    name: String,
+    species: String,
+    year_of_birth: u32,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let ferris = Mascot {
+        name: "Ferris".to_owned(),
+        species: "crab".to_owned(),
+        year_of_birth: 2015,
+    };
+
+    let ferris_file = File::create("examples/ferris.cbor")?;
+    // Write Ferris to the given file.
+    // Instead of a file you can use any type that implements `io::Write`
+    // like a HTTP body, database connection etc.
+    serde_cbor::to_writer(ferris_file, &ferris)?;
+
+    let tux_file = File::open("examples/tux.cbor")?;
+    // Load Tux from a file.
+    // Serde CBOR performs roundtrip serialization meaning that
+    // the data will not change in any way.
+    let tux: Mascot = serde_cbor::from_reader(tux_file)?;
+
+    println!("{:?}", tux);
+    // prints: Mascot { name: "Tux", species: "penguin", year_of_birth: 1996 }
+
+    Ok(())
+}
diff --git a/examples/tags.rs b/examples/tags.rs
new file mode 100644
index 0000000..9281b9b
--- /dev/null
+++ b/examples/tags.rs
@@ -0,0 +1,84 @@
+use serde::de::{Deserialize, Deserializer};
+use serde::ser::{Serialize, Serializer};
+use serde_cbor::tags::Tagged;
+use serde_cbor::Value;
+use serde_derive::{Deserialize, Serialize};
+use std::error::Error;
+
+/// https://tools.ietf.org/html/rfc7049#section-2.4.1
+#[derive(Debug, PartialEq)]
+struct Date(String);
+
+impl Serialize for Date {
+    fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
+        Tagged::new(Some(0), &self.0).serialize(s)
+    }
+}
+
+impl<'de> Deserialize<'de> for Date {
+    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        let tagged = Tagged::<String>::deserialize(deserializer)?;
+        match tagged.tag {
+            Some(0) | None => Ok(Date(tagged.value)),
+            Some(_) => Err(serde::de::Error::custom("unexpected tag")),
+        }
+    }
+}
+
+/// https://tools.ietf.org/html/rfc7049#section-2.4.4.3
+#[derive(Debug, PartialEq)]
+struct Uri(String);
+
+impl Serialize for Uri {
+    fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
+        Tagged::new(Some(32), &self.0).serialize(s)
+    }
+}
+impl<'de> Deserialize<'de> for Uri {
+    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        let tagged = Tagged::<String>::deserialize(deserializer)?;
+        match tagged.tag {
+            // allow deserialization even if there is no tag. Allows roundtrip via other formats such as json
+            Some(0) | None => Ok(Uri(tagged.value)),
+            Some(_) => Err(serde::de::Error::custom("unexpected tag")),
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+struct Bookmark {
+    title: String,
+    link: Uri,
+    created: Date,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let bookmark = Bookmark {
+        title: "The Example Domain".into(),
+        link: Uri("http://example.org/".into()),
+        created: Date("2003-12-13T18:30:02Z".into()),
+    };
+
+    // serialize the struct to bytes
+    let bytes1 = serde_cbor::to_vec(&bookmark)?;
+    // deserialize to a serde_cbor::Value
+    let value1: Value = serde_cbor::from_slice(&bytes1)?;
+    println!("{:?}", value1);
+    // serialize the value to bytes
+    let bytes2 = serde_cbor::to_vec(&value1)?;
+    // deserialize to a serde_cbor::Value
+    let value2: Value = serde_cbor::from_slice(&bytes2)?;
+    println!("{:?}", value2);
+    // deserialize to a Bookmark
+    let result: Bookmark = serde_cbor::from_slice(&bytes2)?;
+
+    // check that the roundtrip was successful
+    assert_eq!(value1, value2);
+    assert_eq!(bookmark, result);
+
+    // check that going via a format that does not support tags does work
+    // let json = serde_json::to_vec(&bookmark)?;
+    // let result: Bookmark = serde_json::from_slice(&json)?;
+    // assert_eq!(bookmark, result);
+    Ok(())
+}
diff --git a/examples/tux.cbor b/examples/tux.cbor
new file mode 100644
index 0000000..c3331aa
--- /dev/null
+++ b/examples/tux.cbor
@@ -0,0 +1 @@
+£dnamecTuxgspeciesgpenguinmyear_of_birthÌ
\ No newline at end of file
-- 
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