From b1d7787ab67f7913f4eb7c1b1ef9f2f5ab87a996 Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@electriccoin.co>
Date: Tue, 15 Feb 2022 22:47:05 +0000
Subject: [PATCH] Re-introduce `ValueSum::from_raw` as a `pub(crate)` method

We removed this in zcash/orchard#267 as it did not need to be part of
the public API, but we do still need a way to convert the user-defined
valueBalance type into a `ValueSum` when constructing `bvk`, and this
method is preferable to exposing the `ValueSum` internals.
---
 src/value.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/value.rs b/src/value.rs
index 1568a5ae..f4ebdeef 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -140,6 +140,16 @@ impl ValueSum {
         // Default for i64 is zero.
         Default::default()
     }
+
+    /// Creates a value sum from its raw numeric value.
+    ///
+    /// This only enforces that the value is a signed 63-bit integer. We use it internally
+    /// in `Bundle::binding_validating_key`, where we are converting from the user-defined
+    /// `valueBalance` type that enforces any additional constraints on the value's valid
+    /// range.
+    pub(crate) fn from_raw(value: i64) -> Self {
+        ValueSum(value as i128)
+    }
 }
 
 impl Add for ValueSum {