1 files changed, 28 insertions, 1 deletions
diff --git a/src/libstore/references.hh b/src/libstore/references.hh
index 013809d12..c38bdd720 100644
--- a/src/libstore/references.hh
+++ b/src/libstore/references.hh
@@ -7,5 +7,32 @@ namespace nix {
 
 PathSet scanForReferences(const Path & path, const PathSet & refs,
     HashResult & hash);
-    
+
+struct RewritingSink : Sink
+{
+    std::string from, to, prev;
+    Sink & nextSink;
+    uint64_t pos = 0;
+
+    std::vector<uint64_t> matches;
+
+    RewritingSink(const std::string & from, const std::string & to, Sink & nextSink);
+
+    void operator () (const unsigned char * data, size_t len) override;
+
+    void flush();
+};
+
+struct HashModuloSink : AbstractHashSink
+{
+    HashSink hashSink;
+    RewritingSink rewritingSink;
+
+    HashModuloSink(HashType ht, const std::string & modulus);
+
+    void operator () (const unsigned char * data, size_t len) override;
+
+    HashResult finish() override;
+};
+
 }