feat: libSystem: `libsys_hash_64` is now defined in `src/System.cc`

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

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