Theodore Ts'o | 6c979d5 | 1999-10-26 02:50:36 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * gen_uuid_nt.c -- Use NT api to generate uuid |
| 3 | * |
| 4 | * Written by Andrey Shedel (andreys@ns.cr.cyco.com) |
| 5 | */ |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 6 | |
| 7 | |
| 8 | #include "uuidP.h" |
| 9 | |
Theodore Ts'o | 6c979d5 | 1999-10-26 02:50:36 +0000 | [diff] [blame^] | 10 | #pragma warning(push,4) |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 11 | |
| 12 | #pragma comment(lib, "ntdll.lib") |
| 13 | |
Theodore Ts'o | 6c979d5 | 1999-10-26 02:50:36 +0000 | [diff] [blame^] | 14 | // |
| 15 | // Here is a nice example why it's not a good idea |
| 16 | // to use native API in ordinary applications. |
| 17 | // Number of parameters in function below was changed from 3 to 4 |
| 18 | // for NT5. |
| 19 | // |
| 20 | // |
| 21 | // NTSYSAPI |
| 22 | // NTSTATUS |
| 23 | // NTAPI |
| 24 | // NtAllocateUuids( |
| 25 | // OUT PULONG p1, |
| 26 | // OUT PULONG p2, |
| 27 | // OUT PULONG p3, |
| 28 | // OUT PUCHAR Seed // 6 bytes |
| 29 | // ); |
| 30 | // |
| 31 | // |
| 32 | |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 33 | unsigned long |
| 34 | __stdcall |
| 35 | NtAllocateUuids( |
| 36 | void* p1, // 8 bytes |
| 37 | void* p2, // 4 bytes |
| 38 | void* p3 // 4 bytes |
| 39 | ); |
| 40 | |
Theodore Ts'o | 6c979d5 | 1999-10-26 02:50:36 +0000 | [diff] [blame^] | 41 | typedef |
| 42 | unsigned long |
| 43 | (__stdcall* |
| 44 | NtAllocateUuids_2000)( |
| 45 | void* p1, // 8 bytes |
| 46 | void* p2, // 4 bytes |
| 47 | void* p3, // 4 bytes |
| 48 | void* seed // 6 bytes |
| 49 | ); |
| 50 | |
| 51 | |
| 52 | |
| 53 | // |
| 54 | // Nice, but instead of including ntddk.h ot winnt.h |
| 55 | // I should define it here because they MISSED __stdcall in those headers. |
| 56 | // |
| 57 | |
| 58 | __declspec(dllimport) |
| 59 | struct _TEB* |
| 60 | __stdcall |
| 61 | NtCurrentTeb(void); |
| 62 | |
| 63 | |
| 64 | // |
| 65 | // The only way to get version information from the system is to examine |
| 66 | // one stored in PEB. But it's pretty dangerouse because this value could |
| 67 | // be altered in image header. |
| 68 | // |
| 69 | |
| 70 | static |
| 71 | int |
| 72 | Nt5(void) |
| 73 | { |
| 74 | //return NtCuttentTeb()->Peb->OSMajorVersion >= 5; |
| 75 | return (int)*(int*)((char*)(int)(*(int*)((char*)NtCurrentTeb() + 0x30)) + 0xA4) >= 5; |
| 76 | } |
| 77 | |
| 78 | |
| 79 | |
| 80 | |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 81 | void uuid_generate(uuid_t out) |
| 82 | { |
Theodore Ts'o | 6c979d5 | 1999-10-26 02:50:36 +0000 | [diff] [blame^] | 83 | if(Nt5()) |
| 84 | { |
| 85 | unsigned char seed[6]; |
| 86 | ((NtAllocateUuids_2000)NtAllocateUuids)(out, ((char*)out)+8, ((char*)out)+12, &seed[0] ); |
| 87 | } |
| 88 | else |
| 89 | { |
| 90 | NtAllocateUuids(out, ((char*)out)+8, ((char*)out)+12); |
| 91 | } |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 92 | } |