File as DB sequence

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NEASM

Joined: 13 Apr 2018
Posts: 13

NEASM 05 May 2018, 13:49

I have a problem. I want to include files in my FASM program, like this:

file db 0x30, 0x1A, 0xCB,
db 0x45, 0xA3, 0x6C....

Exist a program that makes stuff like this? Or exist another method? Thanks in advance. (Sorry for my english, i'm italian).

05 May 2018, 13:49

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8353
Location: Kraków, Poland

Tomasz Grysztar 05 May 2018, 14:01

The simplest method is to use FILE directive:

Code:

my_file FILE 'name.ext'

This way you include the binary data directly (some other assemblers, like NASM, have a directive named INCBIN that does the same).

But if for some reason you need to have your entire source in text form, you can also use fasm to convert any binary file into DB definitions:

Code:

BYTES_PER_LINE = 16

virtual at 0
        buffer:: file 'name.ext'
        size = $
end virtual

repeat size
        if (%-1) mod BYTES_PER_LINE = 0
                if %-1 > 0
                        db 13,10
                end if
                db 'DB '
        else
                db ','
        end if
        load a byte from buffer:%-1
        h = a shr 4
        l = a and 0Fh
        if h >= 10
                db '0', 'A' + h - 10
        else
                db '0' + h
        end if
        if l >= 10
                db 'A' + l - 10
        else
                db '0' + l
        end if
        db 'h'
end repeat

Note: this source works the same with either fasm 1 or fasmg.

05 May 2018, 14:01

NEASM

Joined: 13 Apr 2018
Posts: 13

NEASM 05 May 2018, 22:08

Thanks, Grysztar. I really appreciate your hard work to create a fast, portable and multiplatform assembler. And I have to say, the job succeeded perfectly. In fact, FASM is one of the best assemblers that exist. And, as icing on the cake, one of the best forums there are. Brilliant, and thank you very much for your reply.

05 May 2018, 22:08

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 05 May 2018, 22:38

Just FYI, I think the tool frequently used for this kind of thing is od (octal dump) although that has somewhat been supplanted in recent OSes with hexdump (and its alias "hd", which IIRC is same as "hexdump -C"). IIRC, for hex output you can use "od -v -Ax -tx1".

Oh, and just to keep barely on-topic, Brian Raiter rewrote hexdump in NASM assembly for Linux (202 bytes!).

05 May 2018, 22:38

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