Certificate path builder for new certificate verification library

net/der/input.cc

Index: net/der/input.cc
diff --git a/net/der/input.cc b/net/der/input.cc
index 49955905fa2d1f3db570b8badb4362dab5763330..3b6037b124772bddde0e550b6f8cbda1ec345b20 100644
--- a/net/der/input.cc
+++ b/net/der/input.cc
@@ -16,6 +16,18 @@ namespace der {
 Input::Input() : data_(nullptr), len_(0) {
 }
 
+Input::Input(const Input& other, const Input& old_base, const Input& new_base)
+    : data_(other.data_ ? new_base.data_ + (other.data_ - old_base.data_)
+                        : nullptr),
+      len_(other.len_) {
+  if (other.data_) {
+    DCHECK_EQ(new_base.len_, old_base.len_);
+    DCHECK_GE(data_, new_base.data_);
+    DCHECK_LE(data_ + len_, new_base.data_ + new_base.len_);
+  }
+  DCHECK(*this == other);
+}
+
 Input::Input(const uint8_t* data, size_t len) : data_(data), len_(len) {
 }