1 files changed, 51 insertions, 0 deletions
diff --git a/src/libutil/hash.hh b/src/libutil/hash.hh
new file mode 100644
index 000000000000..0062f987c021
--- /dev/null
+++ b/src/libutil/hash.hh
@@ -0,0 +1,51 @@
+#ifndef __HASH_H
+#define __HASH_H
+
+#include <string>
+
+#include "util.hh"
+
+using namespace std;
+
+
+struct Hash
+{
+    static const unsigned int hashSize = 16;
+    unsigned char hash[hashSize];
+
+    /* Create a zeroed hash object. */
+    Hash();
+
+    /* Check whether two hash are equal. */
+    bool operator == (const Hash & h2) const;
+
+    /* Check whether two hash are not equal. */
+    bool operator != (const Hash & h2) const;
+
+    /* For sorting. */
+    bool operator < (const Hash & h) const;
+
+    /* Convert a hash code into a hexadecimal representation. */
+    operator string() const;
+};
+
+
+/* Parse a hexadecimal representation of a hash code. */
+Hash parseHash(const string & s);
+
+/* Verify that the given string is a valid hash code. */
+bool isHash(const string & s);
+
+/* Compute the hash of the given string. */
+Hash hashString(const string & s);
+
+/* Compute the hash of the given file. */
+Hash hashFile(const Path & path);
+
+/* Compute the hash of the given path.  The hash is defined as
+   md5(dump(path)).
+*/
+Hash hashPath(const Path & path);
+
+
+#endif /* !__HASH_H */