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Use itoa to not allocate a String to serialize an integer

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This commit is contained in:
Anthony Ramine 2017-01-28 23:56:15 +01:00
parent e140c2b5c5
commit 1d88bbb26b
3 changed files with 22 additions and 8 deletions
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1
Cargo.toml
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@ -12,6 +12,7 @@ keywords = ["serde", "serialization", "urlencoded"]
test = false test = false
[dependencies] [dependencies]
itoa = "0.3.0"
serde = "0.9.2" serde = "0.9.2"
url = "1.0.0" url = "1.0.0"
void = "1.0.2" void = "1.0.2"

1
src/lib.rs
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@ -1,5 +1,6 @@
//! `x-www-form-urlencoded` meets Serde //! `x-www-form-urlencoded` meets Serde
extern crate itoa;
#[macro_use] #[macro_use]
extern crate serde; extern crate serde;
extern crate url; extern crate url;

28
src/ser/part.rs
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@ -1,3 +1,4 @@
use itoa;
use ser::Error; use ser::Error;
use ser::void::VoidSerializer; use ser::void::VoidSerializer;
use serde::ser; use serde::ser;
@ -50,35 +51,35 @@ impl<S: Sink> ser::Serializer for PartSerializer<S> {
} }
fn serialize_i8(self, v: i8) -> Result<S::Ok, Error> { fn serialize_i8(self, v: i8) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_i16(self, v: i16) -> Result<S::Ok, Error> { fn serialize_i16(self, v: i16) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_i32(self, v: i32) -> Result<S::Ok, Error> { fn serialize_i32(self, v: i32) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_i64(self, v: i64) -> Result<S::Ok, Error> { fn serialize_i64(self, v: i64) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_u8(self, v: u8) -> Result<S::Ok, Error> { fn serialize_u8(self, v: u8) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_u16(self, v: u16) -> Result<S::Ok, Error> { fn serialize_u16(self, v: u16) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_u32(self, v: u32) -> Result<S::Ok, Error> { fn serialize_u32(self, v: u32) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_u64(self, v: u64) -> Result<S::Ok, Error> { fn serialize_u64(self, v: u64) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string()) self.serialize_integer(v)
} }
fn serialize_f32(self, v: f32) -> Result<S::Ok, Error> { fn serialize_f32(self, v: f32) -> Result<S::Ok, Error> {
@ -207,3 +208,14 @@ impl<S: Sink> ser::Serializer for PartSerializer<S> {
Err(self.sink.unsupported()) Err(self.sink.unsupported())
} }
} }
impl<S: Sink> PartSerializer<S> {
fn serialize_integer<I>(self, value: I) -> Result<S::Ok, Error>
where I: itoa::Integer
{
let mut buf = [b'\0'; 20];
let len = itoa::write(&mut buf[..], value).unwrap();
let part = unsafe { str::from_utf8_unchecked(&buf[0..len]) };
ser::Serializer::serialize_str(self, part)
}
}