[solved] Massive HEX to Data Section

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Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 21 Jul 2020, 03:50

Hi
I have some HEX data to be included into program. How to do this?
It looks like this:

Code:

2353657474696E67730D0A0923566F6C
756D650D0A09094576616C3A20464C65
76656C3D...

"db" needs to be separated by comma for each byte. That means:

Code:

   db    23h,53h,65h,74h,74h,69h,6Eh,67h,73h,0Dh,0Ah,09h,23h,56h,6Fh,6Ch
   ...

Is there any advice to do that much quickly?[/code]

21 Jul 2020, 03:50

bitRAKE

Joined: 21 Jul 2003
Posts: 4073
Location: vpcmpistri

bitRAKE 21 Jul 2020, 04:32

In fasmg:

Code:

macro T H*
        eval "dbx (lengthof `H)/2:0x",`H
end macro

T 2353657474696E67730D0A0923566F6C
T 756D650D0A09094576616C3A20464C65
T 76656C3D

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Last edited by bitRAKE on 21 Jul 2020, 04:37; edited 1 time in total

21 Jul 2020, 04:32

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 21 Jul 2020, 04:33

How is your data stored? In the source file, or on a separate file?

Code:

virtual at 0
  file "my_hex_data.hex"
 my_data::
  ;do your ASCII to binary decoding here
  while ...
    ;..
  end while
end virtual

Or use a good editor or parser (awk, sed, etc.) to pre-process it and generate the DBs

21 Jul 2020, 04:33

bitRAKE

Joined: 21 Jul 2003
Posts: 4073
Location: vpcmpistri

bitRAKE 21 Jul 2020, 04:44

I should have said the macro assumes big endian. Using BWAP we can produce little endian - which is more common.

Code:

macro t H*
        B = (lengthof `H)/2
        eval "dbx B:0x",`H," bswap B"
end macro

t 2353657474696E67730D0A0923566F6C
t 756D650D0A09094576616C3A20464C65
t 76656C3D

21 Jul 2020, 04:44

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 21 Jul 2020, 05:05

Data is an ASCII file which I want to put into my program as file buffer to write that file later. Some parts of this buffer should be modificated. I convert it to HEX, don't I need that?

Code:

buff_point equ $
                        T 2353657474696E67730D0A0923566F6C
                        T 756D650D0A09094576616C3A20464C65
                        T 76656C3D
value_point equ $
                        T ...
                        T ...
buff_end equ $
                        db 0

I don't use fasmg as I don't know enough about it. There is no IDE editor for example.
Is any chance to make fasm macro with the same functionality?

21 Jul 2020, 05:05

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 21 Jul 2020, 05:10

Unrelated but important. Use equals =, not equ. equ is textual replacement so it always expands to current address where it is used, not the address where it was defined.

Overclick wrote:

I don't use fasmg as I don't know enough about it. There is no IDE editor for example.
Is any chance to make fasm macro with the same functionality?

See my post above.

21 Jul 2020, 05:10

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 21 Jul 2020, 05:20

revolution wrote:

Unrelated but important. Use equals =

Got it, thanks
About your post: You mean to copy-paste some huge massives of data or inklude files, but I was looking for some simple way, short one, to see and quickly edit HEX too. Macro above is an ideal way for me, just help me with that macro for fasm

21 Jul 2020, 05:20

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 21 Jul 2020, 05:24

file will include the raw hex for you. No need to copy/paste. That is why I asked how your data was stored.

21 Jul 2020, 05:24

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 21 Jul 2020, 05:29

I need to set up 100+ value points on it. In this way I need to use "file" 100+ times separatelly

21 Jul 2020, 05:29

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 21 Jul 2020, 05:30

Not sure if this will work. Try it;

Code:

macro byteify hash {
        local   ..hash,..length
        virtual at 0
            ..hash:: db hash
            ..length = $/2
        end virtual
        while % <= ..length
                load b_1 byte from ..hash:(%-1)*2
                load b_2 byte from ..hash:(%-1)*2+1
                if b_1 > '9'
                        b_1 = b_1 - 'A' + 10
                else
                        b_1 = b_1 - '0'
                end if
                if b_2 > '9'
                        b_2 = b_2 - 'A' + 10
                else
                        b_2 = b_2 - '0'
                end if
                db b_1 shl 4 + b_2
        end while
}
byteify "2353657474696E67730D0A0923566F6C"

But that doesn't use file so it would need copy/paste.

21 Jul 2020, 05:30

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 21 Jul 2020, 05:56

Seems it works thanks

Description:
Filesize:	16.7 KB
Viewed:	10230 Time(s)

21 Jul 2020, 05:56

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 21 Jul 2020, 07:19

little upgrade for your macro

Code:

..hash:: db `hash

Allows it to use without quotes

21 Jul 2020, 07:19

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 21 Jul 2020, 08:25

Also, if it is "too slow" you could replace the /2 with shr 1.

21 Jul 2020, 08:25

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 21 Jul 2020, 09:53

Why fasm doesn't allow to use # to stick numeric value? Is there any another trick/macro to make it possible? I understand assembler doesn't sure what exactly value should be, but it can make some memory space where programmer could stick it for own riscs. Am I right?
For example: I have defined names as ID100, ID101 etc. I wish to stic ID with number to reach it, simple, why not? Also I understand variable names needed just for assembling/coding, but what if I save this names in memory by myself? Ok, it's different situation then let's see your macro. It simply works with decimal values but heximal where it needs just one mark "h" to go.

21 Jul 2020, 09:53

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 21 Jul 2020, 10:05

String manipulation in macros is tricky. It can be done, but it is usually more trouble than alternatives.

Show your use case, perhaps there is a better way.

21 Jul 2020, 10:05

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