From 3164ac0214c991b993f7b8e0b1410024eb7a7986 Mon Sep 17 00:00:00 2001
From: Valerii Hiora <valerii.hiora@gmail.com>
Date: Tue, 14 Oct 2014 22:39:07 +0300
Subject: [PATCH] Cleaned up BigNum constructors

---
 src/bn/mod.rs | 36 +++++++++++-------------------------
 1 file changed, 11 insertions(+), 25 deletions(-)

diff --git a/src/bn/mod.rs b/src/bn/mod.rs
index 510c9269..6311e89c 100644
--- a/src/bn/mod.rs
+++ b/src/bn/mod.rs
@@ -79,41 +79,27 @@ macro_rules! with_bn_in_ctx(
 )
 
 impl BigNum {
-    // FIXME: squash 3 constructors into one
     pub fn new() -> Result<BigNum, SslError> {
         unsafe {
             ffi::init();
-            let v = ffi::BN_new();
-            if v.is_null() {
-                Err(SslError::get())
-            } else {
-                Ok(BigNum(v))
-            }
+
+            let v = try_ssl_null!(ffi::BN_new());
+            Ok(BigNum(v))
         }
     }
 
     pub fn new_from(n: u64) -> Result<BigNum, SslError> {
-        unsafe {
-            ffi::init();
-            let bn = ffi::BN_new();
-            if bn.is_null() || ffi::BN_set_word(bn, n as c_ulong) == 0 {
-                Err(SslError::get())
-            } else {
-                Ok(BigNum(bn))
-            }
-        }
+        BigNum::new().and_then(|v| unsafe {
+            try_ssl!(ffi::BN_set_word(v.raw(), n as c_ulong));
+            Ok(v)
+        })
     }
 
     pub fn new_from_slice(n: &[u8]) -> Result<BigNum, SslError> {
-        unsafe {
-            ffi::init();
-            let bn = ffi::BN_new();
-            if bn.is_null() || ffi::BN_bin2bn(n.as_ptr(), n.len() as c_int, bn).is_null() {
-                Err(SslError::get())
-            } else {
-                Ok(BigNum(bn))
-            }
-        }
+        BigNum::new().and_then(|v| unsafe {
+            try_ssl_null!(ffi::BN_bin2bn(n.as_ptr(), n.len() as c_int, v.raw()));
+            Ok(v)
+        })
     }
 
     pub fn checked_sqr(&self) -> Result<BigNum, SslError> {