1 files changed, 19 insertions, 0 deletions
diff --git a/isam/open.c b/isam/open.c
index 48fab27cac1..824fbe804ee 100644
--- a/isam/open.c
+++ b/isam/open.c
@@ -453,3 +453,22 @@ static void setup_key_functions(register N_KEYDEF *keyinfo)
   }
   return;
 }
+
+/*
+  Calculate a long checksum for a memoryblock. Used to verify pack_isam
+
+  SYNOPSIS
+    checksum()
+      mem	Pointer to memory block
+      count	Count of bytes
+*/
+
+ulong _nisam_checksum(const byte *mem, uint count)
+{
+  ulong crc;
+  for (crc= 0; count-- ; mem++)
+    crc= ((crc << 1) + *((uchar*) mem)) +
+      test(crc & ((ulong) 1L << (8*sizeof(ulong)-1)));
+  return crc;
+}
+