Convert C Struct bit fields to FASM

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mns

Joined: 20 Dec 2007
Posts: 150
Location: Piliyandala,Sri lanka

mns 03 Jul 2020, 13:48

I am trying to convert d3d11.h file to FASM include file and found this.

typedef struct D3D11_VIDEO_PROCESSOR_COLOR_SPACE
{
UINT Usage : 1;
UINT RGB_Range : 1;
UINT YCbCr_Matrix : 1;
UINT YCbCr_xvYCC : 1;
UINT Nominal_Range : 2;
UINT Reserved : 26;
} D3D11_VIDEO_PROCESSOR_COLOR_SPACE;

Is there way to convert bit field parts to FASM or I just have to convert the struct without bit fields as this,
struct D3D11_VIDEO_PROCESSOR_COLOR_SPACE
Usage dd ?
RGB_Range dd ?
YCbCr_Matrix dd ?
YCbCr_xvYCC dd ?
Nominal_Range dd ?
Reserved dd ?
ends

(although I found a previous post on similar topic using unions but couldn't understand a bit)
Hope someone can help? Shocked

03 Jul 2020, 13:48

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system

revolution 03 Jul 2020, 14:03

The whole structure is one dword. And within that are the bits.

Code:

D3D11_VIDEO_PROCESSOR_COLOR_SPACE  dd ?

;for multipliers
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.Usage  = 1 shl 0
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.RGB_Range  = 1 shl 1
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.YCbCr_Matrix  = 1 shl 2
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.YCbCr_xvYCC  = 1 shl 3
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.Nominal_Range  = 1 shl 4

;for masks
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.Usage  = 1 shl 0
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.RGB_Range  = 1 shl 1
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.YCbCr_Matrix  = 1 shl 2
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.YCbCr_xvYCC  = 1 shl 3
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.Nominal_Range  = 3 shl 4

;for shifts
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.Usage  = 0
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.RGB_Range  = 1
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.YCbCr_Matrix  = 2
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.YCbCr_xvYCC  = 3
D3D11_VIDEO_PROCESSOR_COLOR_SPACE.Nominal_Range  = 4

03 Jul 2020, 14:03

mns

Joined: 20 Dec 2007
Posts: 150
Location: Piliyandala,Sri lanka

mns 03 Jul 2020, 17:28

Thank you revolution, for the kind quick response.
So the "=" will define the size of the struct: members?(If the question is silly and not grasping the basic knowladge of FASM, kindly bear with me) Confused

03 Jul 2020, 17:28

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system

revolution 03 Jul 2020, 23:22

"=" is just defining a value, there is no special meaning, it is just a number.

You can use the number to examine the bits you need. For example if you are using masks:

Code:

mov eax, [D3D11_VIDEO_PROCESSOR_COLOR_SPACE]
test eax, D3D11_VIDEO_PROCESSOR_COLOR_SPACE.RGB_Range

03 Jul 2020, 23:22

mns

Joined: 20 Dec 2007
Posts: 150
Location: Piliyandala,Sri lanka

mns 04 Jul 2020, 08:08

Thank you very much revolution

04 Jul 2020, 08:08

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