Introduce de::from_reader

2 files changed, 15 insertions, 1 deletions

diff --git a/src/de.rs b/src/de.rs
index 95208e9..95999d0 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -4,6 +4,7 @@ use serde::de;
 
 pub use serde::de::value::Error;
 use serde::de::value::MapDeserializer;
+use std::io::Read;
 use url::form_urlencoded::Parse as UrlEncodedParse;
 use url::form_urlencoded::parse;
 
@@ -45,6 +46,19 @@ pub fn from_str<T: de::Deserialize>(input: &str) -> Result<T, Error> {
     from_bytes(input.as_bytes())
 }
 
+/// Convenience function that reads all bytes from `reader` and deserializes
+/// them with `from_bytes`.
+pub fn from_reader<T, R>(mut reader: R) -> Result<T, Error>
+    where T: de::Deserialize, R: Read
+{
+    let mut buf = vec![];
+    reader.read_to_end(&mut buf)
+        .map_err(|e| {
+            de::Error::custom(format_args!("could not read input: {}", e))
+        })?;
+    from_bytes(&buf)
+}
+
 /// A deserializer for the `application/x-www-form-urlencoded` format.
 ///
 /// * Supported top-level outputs are structs, maps and sequences of pairs,
diff --git a/src/lib.rs b/src/lib.rs
index 285a091..db5f3a7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,5 +11,5 @@ extern crate url;
 pub mod de;
 pub mod ser;
 
-pub use de::{Deserializer, from_bytes, from_str};
+pub use de::{Deserializer, from_bytes, from_str, from_reader};
 pub use ser::{Serializer, to_string};