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1

I am trying to create a program that can modify a compiled (or equivalent) file. The problem is to locate the different values in the compiled file, I manage to find string values but not integer values.

What I have done so far is that I take a compiled file as an input and produce a new file that is "human readable", basically I read the compiled file byte by byte and write each byte in the new file as a string of bits, for example a byte in the original file with value 124 becomes "01111100" in the new file. This seems to be working fine, I am able to do the reverse operation on the "human readable" file and run it.

#include <stdlib.h>
#include <stdio.h>

int main()

 printf("Hello world!n");
 return 0;

For example, if I compile and translate the output file of the code above, I can find a sequence of bits corresponding to "Hello world!n".

But in the code below, when translating the output file after compiling it, I can't find something corresponding to 3000 (whether I am looking for an Integer or a String corresponding to 3000).

#include <stdlib.h>
#include <stdio.h>

int main()

 int x = 3000;
 printf("%d", x);
 return 0;

My guess so far is that 3000 is written in a way I do not know about. Although it is equally possible that I'm doing something wrong in the translation process. So far I have tried to look for 3000 with the two following sequence of bits:

• As a Integer 00001011 10111000


• As a String 00110011 00110000 00110000 00110000

Edit: It may be important to underline that I compile with the no optimization flag -O0.

c compilation

share|improve this question

edited Mar 23 at 21:29

Jonathan Leffler

579k966931049

asked Mar 23 at 20:55

LeopLeop

456

add a comment | 

1

I am trying to create a program that can modify a compiled (or equivalent) file. The problem is to locate the different values in the compiled file, I manage to find string values but not integer values.

What I have done so far is that I take a compiled file as an input and produce a new file that is "human readable", basically I read the compiled file byte by byte and write each byte in the new file as a string of bits, for example a byte in the original file with value 124 becomes "01111100" in the new file. This seems to be working fine, I am able to do the reverse operation on the "human readable" file and run it.

#include <stdlib.h>
#include <stdio.h>

int main()

 printf("Hello world!n");
 return 0;

For example, if I compile and translate the output file of the code above, I can find a sequence of bits corresponding to "Hello world!n".

But in the code below, when translating the output file after compiling it, I can't find something corresponding to 3000 (whether I am looking for an Integer or a String corresponding to 3000).

#include <stdlib.h>
#include <stdio.h>

int main()

 int x = 3000;
 printf("%d", x);
 return 0;

My guess so far is that 3000 is written in a way I do not know about. Although it is equally possible that I'm doing something wrong in the translation process. So far I have tried to look for 3000 with the two following sequence of bits:

• As a Integer 00001011 10111000


• As a String 00110011 00110000 00110000 00110000

Edit: It may be important to underline that I compile with the no optimization flag -O0.

c compilation

share|improve this question

edited Mar 23 at 21:29

Jonathan Leffler

579k966931049

asked Mar 23 at 20:55

LeopLeop

456

add a comment | 

I am trying to create a program that can modify a compiled (or equivalent) file. The problem is to locate the different values in the compiled file, I manage to find string values but not integer values.

What I have done so far is that I take a compiled file as an input and produce a new file that is "human readable", basically I read the compiled file byte by byte and write each byte in the new file as a string of bits, for example a byte in the original file with value 124 becomes "01111100" in the new file. This seems to be working fine, I am able to do the reverse operation on the "human readable" file and run it.

#include <stdlib.h>
#include <stdio.h>

int main()

 printf("Hello world!n");
 return 0;

For example, if I compile and translate the output file of the code above, I can find a sequence of bits corresponding to "Hello world!n".

But in the code below, when translating the output file after compiling it, I can't find something corresponding to 3000 (whether I am looking for an Integer or a String corresponding to 3000).

#include <stdlib.h>
#include <stdio.h>

int main()

 int x = 3000;
 printf("%d", x);
 return 0;

My guess so far is that 3000 is written in a way I do not know about. Although it is equally possible that I'm doing something wrong in the translation process. So far I have tried to look for 3000 with the two following sequence of bits:

• As a Integer 00001011 10111000


• As a String 00110011 00110000 00110000 00110000

Edit: It may be important to underline that I compile with the no optimization flag -O0.

c compilation

share|improve this question

edited Mar 23 at 21:29

Jonathan Leffler

579k966931049

asked Mar 23 at 20:55

LeopLeop

456

#include <stdlib.h>
#include <stdio.h>

int main()

 printf("Hello world!n");
 return 0;

#include <stdlib.h>
#include <stdio.h>

int main()

 int x = 3000;
 printf("%d", x);
 return 0;

share|improve this question

edited Mar 23 at 21:29

Jonathan Leffler

579k966931049

asked Mar 23 at 20:55

LeopLeop

456

share|improve this question

edited Mar 23 at 21:29

Jonathan Leffler

579k966931049

asked Mar 23 at 20:55

LeopLeop

456

edited Mar 23 at 21:29

Jonathan Leffler

579k966931049

edited Mar 23 at 21:29

Jonathan Leffler

579k966931049

asked Mar 23 at 20:55

LeopLeop

456

asked Mar 23 at 20:55

LeopLeop

456

1 Answer
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4

You're probably on an Intel machine which stores integers in little-endian order. You'd need to search for 10111000 00001011 (written in binary — the bytes in the reverse order from what you used before) or 0xB8 0x0B in hex bytes.

share|improve this answer

answered Mar 23 at 21:07

Jonathan LefflerJonathan Leffler

579k966931049

add a comment | 

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4

You're probably on an Intel machine which stores integers in little-endian order. You'd need to search for 10111000 00001011 (written in binary — the bytes in the reverse order from what you used before) or 0xB8 0x0B in hex bytes.

share|improve this answer

answered Mar 23 at 21:07

Jonathan LefflerJonathan Leffler

579k966931049

add a comment | 

4

You're probably on an Intel machine which stores integers in little-endian order. You'd need to search for 10111000 00001011 (written in binary — the bytes in the reverse order from what you used before) or 0xB8 0x0B in hex bytes.

share|improve this answer

answered Mar 23 at 21:07

Jonathan LefflerJonathan Leffler

579k966931049

add a comment | 

You're probably on an Intel machine which stores integers in little-endian order. You'd need to search for 10111000 00001011 (written in binary — the bytes in the reverse order from what you used before) or 0xB8 0x0B in hex bytes.

share|improve this answer

answered Mar 23 at 21:07

Jonathan LefflerJonathan Leffler

579k966931049

share|improve this answer

answered Mar 23 at 21:07

Jonathan LefflerJonathan Leffler

579k966931049

answered Mar 23 at 21:07

Jonathan LefflerJonathan Leffler

579k966931049

answered Mar 23 at 21:07

Jonathan LefflerJonathan Leffler

579k966931049