How Can I Seamlessly Embed Resources into Executables Using GCC?
Dec 18, 2024 pm 04:32 PM
Embed Resources Seamlessly in Executables with GCC
To effortlessly embed external binary data within C/C applications compiled by GCC, consider the following methods:
Utilizing ld's Object Creation Feature:
ld, the linker, offers the capability to convert any file into an object. To embed a file, run the command:
ld -r -b binary -o binary.o foo.bar # then link in binary.o
This creates an object file ("binary.o") with symbols such as:
- _binary_foo_bar_start
- _binary_foo_bar_end
- _binary_foo_bar_size
For instance, to access the contents of a simple text file embedded using this method:
#include <stdio.h>
extern char _binary_foo_bar_start[];
extern char _binary_foo_bar_end[];
int main(void)
{
// Print the contents of the embedded resource
for (char* p = _binary_foo_bar_start; p != _binary_foo_bar_end; ++p) {
putchar( *p);
}
return 0;
}
Employing a Bin2c/Bin2h Utility:
These utilities convert files into an array of bytes. Integrate the resulting array into your code.
Example with ld Object Creation:
Here's how to incorporate a resource into an object file:
ld -r -b binary -o foo.bar.o foo.bar
The resulting object file contains these symbols:
- _binary_foo_bar_start
- _binary_foo_bar_end
- _binary_foo_bar_size
To access the embedded resource within your code:
unsigned int iSize = (unsigned int)(&_binary_foo_bar_end - &_binary_foo_bar_start);
This provides an alternative method to determine the resource size.
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