From 227c1560530dc822180e71690795d4a97d2d7310 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Tue, 27 Mar 2018 00:00:28 +0000
Subject: sid helper interfaces: added ntapi_tt_sid_compare().

---
 include/ntapi/nt_object.h  |  5 +++++
 include/ntapi/ntapi.h      |  1 +
 src/internal/ntapi.c       |  1 +
 src/internal/ntapi_fnapi.h |  1 +
 src/object/ntapi_tt_sid.c  | 30 ++++++++++++++++++++++++++++++
 5 files changed, 38 insertions(+)

diff --git a/include/ntapi/nt_object.h b/include/ntapi/nt_object.h
index b76b43b..c89467e 100644
--- a/include/ntapi/nt_object.h
+++ b/include/ntapi/nt_object.h
@@ -569,4 +569,9 @@ typedef void    __stdcall ntapi_tt_sid_copy(
 	__in	const nt_sid *		src);
 
 
+typedef int32_t __stdcall ntapi_tt_sid_compare(
+	__in	const nt_sid *		sida,
+	__in	const nt_sid *		sidb);
+
+
 #endif
diff --git a/include/ntapi/ntapi.h b/include/ntapi/ntapi.h
index d25116c..fbd5694 100644
--- a/include/ntapi/ntapi.h
+++ b/include/ntapi/ntapi.h
@@ -374,6 +374,7 @@ typedef struct _ntapi_vtbl {
 	ntapi_tt_open_keyed_object_directory *		tt_open_keyed_object_directory;
 	ntapi_tt_create_keyed_object_directory_entry *	tt_create_keyed_object_directory_entry;
 	ntapi_tt_sid_copy *				tt_sid_copy;
+	ntapi_tt_sid_compare *				tt_sid_compare;
 
 	/* nt_crc32.h */
 	ntapi_tt_buffer_crc32 *				tt_buffer_crc32;
diff --git a/src/internal/ntapi.c b/src/internal/ntapi.c
index 6421cb1..f0b4431 100644
--- a/src/internal/ntapi.c
+++ b/src/internal/ntapi.c
@@ -167,6 +167,7 @@ static int32_t __fastcall __ntapi_init_once(ntapi_vtbl ** pvtbl)
 	__ntapi->tt_open_keyed_object_directory			= __ntapi_tt_open_keyed_object_directory;
 	__ntapi->tt_create_keyed_object_directory_entry		= __ntapi_tt_create_keyed_object_directory_entry;
 	__ntapi->tt_sid_copy					= __ntapi_tt_sid_copy;
+	__ntapi->tt_sid_compare					= __ntapi_tt_sid_compare;
 
 	/* nt_crc32.h */
 	__ntapi->tt_buffer_crc32 				= __ntapi_tt_buffer_crc32;
diff --git a/src/internal/ntapi_fnapi.h b/src/internal/ntapi_fnapi.h
index c8567f1..5aaae4c 100644
--- a/src/internal/ntapi_fnapi.h
+++ b/src/internal/ntapi_fnapi.h
@@ -29,6 +29,7 @@ ntapi_tt_create_keyed_object_directory		__ntapi_tt_create_keyed_object_directory
 ntapi_tt_open_keyed_object_directory		__ntapi_tt_open_keyed_object_directory;
 ntapi_tt_create_keyed_object_directory_entry	__ntapi_tt_create_keyed_object_directory_entry;
 ntapi_tt_sid_copy				__ntapi_tt_sid_copy;
+ntapi_tt_sid_compare				__ntapi_tt_sid_compare;
 
 /* nt_crc32.h */
 ntapi_tt_buffer_crc32				__ntapi_tt_buffer_crc32;
diff --git a/src/object/ntapi_tt_sid.c b/src/object/ntapi_tt_sid.c
index d93775c..a35b9a7 100644
--- a/src/object/ntapi_tt_sid.c
+++ b/src/object/ntapi_tt_sid.c
@@ -21,3 +21,33 @@ void __stdcall __ntapi_tt_sid_copy(
 	for (i=0; i<src->sub_authority_count; i++)
 		dst->sub_authority[i] = src->sub_authority[i];
 }
+
+int32_t __stdcall __ntapi_tt_sid_compare(
+	__in	const nt_sid *	sida,
+	__in	const nt_sid *	sidb)
+{
+	int			i;
+	int32_t			a;
+	int32_t			b;
+	const unsigned char *	va;
+	const unsigned char *	vb;
+
+	if ((a = sida->revision) - (b = sidb->revision))
+		return a-b;
+
+	if ((a = sida->sub_authority_count) - (b = sidb->sub_authority_count))
+		return a-b;
+
+	va=sida->identifier_authority.value;
+	vb=sidb->identifier_authority.value;
+
+	for (i=0; i<6; i++)
+		if ((a = va[i]) - (b = vb[i]))
+			return a-b;
+
+	for (i=0; i<sida->sub_authority_count; i++)
+		if ((a = sida->sub_authority[i]) - (b = sidb->sub_authority[i]))
+			return a-b;
+
+	return 0;
+}
-- 
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