1 files changed, 17 insertions, 0 deletions
diff --git a/dev/libSystem/src/System.cc b/dev/libSystem/src/System.cc
index 3870ff18..ba848a18 100644
--- a/dev/libSystem/src/System.cc
+++ b/dev/libSystem/src/System.cc
@@ -23,6 +23,23 @@ IMPORT_C Void _rtl_assert(Bool expr, const Char* origin) {
   }
 }
 
+/// @note this uses the FNV 64-bit variant.
+IMPORT_C UInt64 libsys_hash_64(const Char* path) {
+  if (!path || *path == 0) return 0;
+
+  const UInt64 kFNVSeed  = 0xcbf29ce484222325ULL;
+  const UInt64 kFNVPrime = 0x100000001b3ULL;
+
+  UInt64 hash = kFNVSeed;
+
+  while (*path) {
+    hash ^= (Char) (*path++);
+    hash *= kFNVPrime;
+  }
+
+  return hash;
+}
+
 // memmove-style copy
 IMPORT_C VoidPtr MmCopyMemory(_Input VoidPtr dest, _Input VoidPtr src, _Input SizeT len) {
   // handles overlap, prefers 64-bit word copies when aligned