Move string hash function into String class.

hashCode() seems to do sampling while creating the hash.
hashCode64() will not.

Change-Id: Id30f5a2a774cf5244dbc00da9649e95a532484be

1 files changed, 18 insertions, 0 deletions

diff --git a/include/rtl/string.h b/include/rtl/string.h
index 32344bfa4413..71e095561a37 100644
--- a/include/rtl/string.h
+++ b/include/rtl/string.h
@@ -277,6 +277,24 @@ SAL_DLLPUBLIC sal_Int32 SAL_CALL rtl_str_hashCode(
 SAL_DLLPUBLIC sal_Int32 SAL_CALL rtl_str_hashCode_WithLength(
         const sal_Char * str, sal_Int32 len ) SAL_THROW_EXTERN_C();
 
+/** Return a hash code (64bit) for a string.
+
+    It is not allowed to store the hash code persistently, because later
+    versions could return other hash codes.
+
+    @param str
+    a string.  Need not be null-terminated, but must be at least as long as
+    the specified len.
+
+    @param len
+    the length of the string.
+
+    @return
+    a hash code for the given string.
+ */
+SAL_DLLPUBLIC sal_uInt64 SAL_CALL rtl_str_hashCode64_WithLength(
+        const sal_Char * str, sal_Int32 len ) SAL_THROW_EXTERN_C();
+
 /** Search for the first occurrence of a character within a string.
 
     The string must be null-terminated.