Wednesday, August 6, 2008

c/c++: embed binary data into elf v.2

In previos post I've described how to embed data into object.
The other opprotunity is to store data in the c/c++ array.
Again, I'll use data.txt:

$cat data.txt 
data file
To create a source file with this data I'll use xxd utility:
xxd -i data.txt data.c
$cat data.c
unsigned char data_txt[] = {
  0x64, 0x61, 0x74, 0x61, 0x20, 0x66, 0x69, 0x6c, 0x65, 0x0a
unsigned int data_txt_len = 10;

Simple c source file to use this array will look like:
#include <stdio.h>

extern unsigned char data_txt[];
extern unsigned int data_txt_len;

main(int argc, char **argv)
    printf("%d", data_txt_len);
    printf("%s", data_txt);

    return 0;
To compile
gcc test.c data.c

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