* Move parseHash16or32 into libutil, and use in nix-hash.

2 files changed, 19 insertions, 0 deletions

diff --git a/src/libutil/hash.cc b/src/libutil/hash.cc
index b9e7846992f6..53342344107d 100644
--- a/src/libutil/hash.cc
+++ b/src/libutil/hash.cc
@@ -204,6 +204,22 @@ Hash parseHash32(HashType ht, const string & s)
 }
 
 
+Hash parseHash16or32(HashType ht, const string & s)
+{
+    Hash hash(ht);
+    if (s.size() == hash.hashSize * 2)
+        /* hexadecimal representation */
+        hash = parseHash(ht, s);
+    else if (s.size() == hashLength32(hash))
+        /* base-32 representation */
+        hash = parseHash32(ht, s);
+    else
+        throw Error(format("hash `%1%' has wrong length for hash type `%2%'")
+            % s % printHashType(ht));
+    return hash;
+}
+
+
 bool isHash(const string & s)
 {
     if (s.length() != 32) return false;
diff --git a/src/libutil/hash.hh b/src/libutil/hash.hh
index 13740954d625..cbdcf4c8d4ff 100644
--- a/src/libutil/hash.hh
+++ b/src/libutil/hash.hh
@@ -58,6 +58,9 @@ string printHash32(const Hash & hash);
 /* Parse a base-32 representation of a hash code. */
 Hash parseHash32(HashType ht, const string & s);
 
+/* Parse a base-16 or base-32 representation of a hash code. */
+Hash parseHash16or32(HashType ht, const string & s);
+
 /* Verify that the given string is a valid hash code. */
 bool isHash(const string & s);