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-rw-r--r--lib/uuid/gen_uuid_nt.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/lib/uuid/gen_uuid_nt.c b/lib/uuid/gen_uuid_nt.c
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+++ b/lib/uuid/gen_uuid_nt.c
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+/*
+ * gen_uuid_nt.c -- Use NT api to generate uuid
+ *
+ * Written by Andrey Shedel (andreys@ns.cr.cyco.com)
+ */
+
+
+#include "config.h"
+#include "uuidP.h"
+
+#pragma warning(push,4)
+
+#pragma comment(lib, "ntdll.lib")
+
+//
+// Here is a nice example why it's not a good idea
+// to use native API in ordinary applications.
+// Number of parameters in function below was changed from 3 to 4
+// for NT5.
+//
+//
+// NTSYSAPI
+// NTSTATUS
+// NTAPI
+// NtAllocateUuids(
+// OUT PULONG p1,
+// OUT PULONG p2,
+// OUT PULONG p3,
+// OUT PUCHAR Seed // 6 bytes
+// );
+//
+//
+
+unsigned long
+__stdcall
+NtAllocateUuids(
+ void* p1, // 8 bytes
+ void* p2, // 4 bytes
+ void* p3 // 4 bytes
+ );
+
+typedef
+unsigned long
+(__stdcall*
+NtAllocateUuids_2000)(
+ void* p1, // 8 bytes
+ void* p2, // 4 bytes
+ void* p3, // 4 bytes
+ void* seed // 6 bytes
+ );
+
+
+
+//
+// Nice, but instead of including ntddk.h ot winnt.h
+// I should define it here because they MISSED __stdcall in those headers.
+//
+
+__declspec(dllimport)
+struct _TEB*
+__stdcall
+NtCurrentTeb(void);
+
+
+//
+// The only way to get version information from the system is to examine
+// one stored in PEB. But it's pretty dangerous because this value could
+// be altered in image header.
+//
+
+static
+int
+Nt5(void)
+{
+ //return NtCuttentTeb()->Peb->OSMajorVersion >= 5;
+ return (int)*(int*)((char*)(int)(*(int*)((char*)NtCurrentTeb() + 0x30)) + 0xA4) >= 5;
+}
+
+
+
+
+void uuid_generate(uuid_t out)
+{
+ if(Nt5())
+ {
+ unsigned char seed[6];
+ ((NtAllocateUuids_2000)NtAllocateUuids)(out, ((char*)out)+8, ((char*)out)+12, &seed[0] );
+ }
+ else
+ {
+ NtAllocateUuids(out, ((char*)out)+8, ((char*)out)+12);
+ }
+}