Remove libc dependency.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_cbor"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Pyfisch <pyfisch@gmail.com>"]
 repository = "https://github.com/pyfisch/cbor"
 documentation = "http://pyfisch.github.io/cbor/serde_cbor/index.html"
@@ -11,7 +11,6 @@ keywords = ["serde", "cbor", "serialization"]
 
 [dependencies]
 byteorder = "0.3"
-libc = "0.2.6"
 serde = "0.7.0"
 
 [features]

src/de.rs

@@ -160,27 +160,14 @@ impl<R: Read> Deserializer<R> {
 
     #[inline]
     fn parse_simple_value<V: Visitor>(&mut self, first: u8, mut visitor: V) -> Result<V::Value> {
-        // Workaround to not require the currently unstable `f32::ldexp`:
-        mod ffi {
-            use libc::c_int;
-
-            extern "C" {
-                pub fn ldexpf(x: f32, exp: c_int) -> f32;
-            }
-
-            #[inline]
-            pub fn c_ldexpf(x: f32, exp: isize) -> f32 {
-                unsafe { ldexpf(x, exp as c_int) }
-            }
-        }
         #[inline]
         fn decode_f16(half: u16) -> f32 {
             let exp: u16 = half >> 10 & 0x1f;
             let mant: u16 = half & 0x3ff;
             let val: f32 = if exp == 0 {
-                ffi::c_ldexpf(mant as f32, -24)
+                (mant as f32) * (2.0f32).powi(-24)
             } else if exp != 31 {
-                ffi::c_ldexpf(mant as f32 + 1024f32, exp as isize - 25)
+                (mant as f32 + 1024f32) * (2.0f32).powi(exp as i32 - 25)
             } else if mant == 0 {
                 ::std::f32::INFINITY
             } else {

src/lib.rs

@@ -115,7 +115,6 @@
 #![deny(missing_docs)]
 
 extern crate byteorder;
-extern crate libc;
 extern crate serde;
 
 pub use de::{from_slice, from_reader};