StorePath: Rewrite in C++

On nix-env -qa -f '<nixpkgs>', this reduces maximum RSS by 20970 KiB
and runtime by 0.8%. This is mostly because we're not parsing the hash
part as a hash anymore (just validating that it consists of base-32
characters).

Also, replace storePathToHash() by StorePath::hashPart().

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstore/nar-info.cc b/src/libstore/nar-info.cc
index 232284723..d7fc30e91 100644
--- a/src/libstore/nar-info.cc
+++ b/src/libstore/nar-info.cc
@@ -56,11 +56,11 @@ NarInfo::NarInfo(const Store & store, const std::string & s, const std::string &
             auto refs = tokenizeString<Strings>(value, " ");
             if (!references.empty()) corrupt();
             for (auto & r : refs)
-                references.insert(StorePath::fromBaseName(r));
+                references.insert(StorePath(r));
         }
         else if (name == "Deriver") {
             if (value != "unknown-deriver")
-                deriver = StorePath::fromBaseName(value);
+                deriver = StorePath(value);
         }
         else if (name == "System")
             system = value;