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/*
* gen_uuid_nt.c -- Use NT api to generate uuid
*
* Written by Andrey Shedel (andreys@ns.cr.cyco.com)
* Copyright (C) 2005, Net Integration Technologies, Inc.
*
* %Begin-Header%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
* WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
* %End-Header%
*/
#ifdef WIN32
#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 dangerouse 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;
}
/* Use the native Windows UUID generation facilities. */
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);
}
}
/* The following two functions exist to provide compatibility. */
void uuid_generate_random(uuid_t out)
{
uuid_generate(out);
}
void uuid_generate_time(uuid_t out)
{
uuid_generate(out);
}
#endif /* WIN32 */
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