From 9322eee80aadd6d9f80ebc11d29d09898237a14a Mon Sep 17 00:00:00 2001
From: Jonathan Marler <jonathan.j.marler@hp.com>
Date: Thu, 22 Aug 2019 13:56:04 -0600
Subject: Encapsulate bigint representation, assert on cast data loss

---
 src/bigint.cpp | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

(limited to 'src/bigint.cpp')

diff --git a/src/bigint.cpp b/src/bigint.cpp
index da53a2b129..b227b3b4f7 100644
--- a/src/bigint.cpp
+++ b/src/bigint.cpp
@@ -15,6 +15,8 @@
 #include <limits>
 #include <algorithm>
 
+static uint64_t bigint_as_unsigned(const BigInt *bigint);
+
 static void bigint_normalize(BigInt *dest) {
     const uint64_t *digits = bigint_ptr(dest);
 
@@ -1660,7 +1662,7 @@ size_t bigint_clz(const BigInt *bi, size_t bit_count) {
     return count;
 }
 
-uint64_t bigint_as_unsigned(const BigInt *bigint) {
+static uint64_t bigint_as_unsigned(const BigInt *bigint) {
     assert(!bigint->is_negative);
     if (bigint->digit_count == 0) {
         return 0;
@@ -1671,6 +1673,25 @@ uint64_t bigint_as_unsigned(const BigInt *bigint) {
     }
 }
 
+uint64_t bigint_as_u64(const BigInt *bigint)
+{
+    return bigint_as_unsigned(bigint);
+}
+
+uint32_t bigint_as_u32(const BigInt *bigint) {
+    uint64_t value64 = bigint_as_unsigned(bigint);
+    uint32_t value32 = (uint32_t)value64;
+    assert (value64 == value32);
+    return value32;
+}
+
+size_t bigint_as_usize(const BigInt *bigint) {
+    uint64_t value64 = bigint_as_unsigned(bigint);
+    size_t valueUsize = (size_t)value64;
+    assert (value64 == valueUsize);
+    return valueUsize;
+}
+
 int64_t bigint_as_signed(const BigInt *bigint) {
     if (bigint->digit_count == 0) {
         return 0;
-- 
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