Binary to object Windows dev tool

Converts a binary file to a machine-independent Windows object (OBJ) file, so you can link the binary file with your own code.

How to build & run

1. Open the Command Prompt for VS (Visual Studio).

2. Run the Program Maintenance Utility:

   nmake

3. Convert your binary file to an object file:

   binobj.exe MyArray 16 my_data.bin my_data.obj

   Replace MyArray with the symbol name you want to use for your data, and replace 16 with the alignment (in bytes) that is appropriate for your data.

4. Add this line to your own source code to declare the data as external:

   extern "C" const unsigned char MyArray[1024*1024];

   Replace unsigned char with the POD type of your binary data, and replace 1024*1024 with the number of elements that are needed to hold your data. If you don't need to know the size at compile time, then you can also omit the number of elements.

5. Link your own code against the object file, e.g.:

   cl my_program.cpp my_data.obj

Alternate solution for other platforms

This tool is Windows only, so it won't work on other platforms, like macOS or Linux. However, if your platform comes with the GNU Binary Utilities, and if it includes objcopy, then you could do the following:

1. Create a C source file (my_data.c) that contains a single line:

   const unsigned char MyArray[1024*1024] = { 0 };

   Replace unsigned char with the POD type of your binary data, and replace 1024*1024 with the number of elements that are needed to hold your data.

2. Compile this C file to create an object file containing zeros, and then use objcopy to replace the zeros with the actual binary data:

   gcc -fvisibility=hidden -c -o my_data.o my_data.c
objcopy --update-section .rodata=my_data.bin my_data.o

3. Add this line to your own source code to declare the data as external:

   extern "C" const unsigned char MyArray[1024*1024];

   If you don't need to know the size at compile time, then you can also omit the number of elements here.

4. Link your own code against the object file, e.g.:

   g++ my_program.cpp my_data.o

Note that Apple's Xcode apparently doesn't include objcopy, but there is yet another way:

1. Create an assembly source file (my_data.s) that contains the following lines:

   .static_const
.align 4
.globl _MyArray
_MyArray: .incbin "my_data.bin"

   Replace .align 4 with the alignment that is appropriate for your data. Note that this alignment is in 2^n bytes, so .align 4 actually means 2^4 = 16 bytes.

2. Assemble this assembly file to create an object file:

   as -o my_data.o my_data.s

3. Add this line to your own source code to declare the data as external:

   extern "C" const unsigned char MyArray[1024*1024];

   If you don't need to know the size at compile time, then you can also omit the number of elements here.

4. Link your own code against the object file:

   g++ my_program.cpp my_data.o

5. Create a symbol file (my_symbols.exp) containing the following line:

   _MyArray

   Note that this file can also hold multiple lines/symbols, in case you have multiple binary files.

6. Strip the symbols from your binary code:

   strip -R my_symbols.exp -i a.out

Note that you can also add the assembly file to your Xcode project, and then set Build Settings > Additional Strip Flags to -R my_symbols.exp -i, so you can build using Xcode.

License

Copyright © 2021-2024 Theo Niessink <[email protected]>
This work is free. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.