libtcc.c

//http://z0mbie.daemonlab.org/libtcc.c.txt

/*
 * Simple Test program for libtcc // modified
 *
 * libtcc can be useful to use tcc as a "backend" for a code generator.
 *                                                ^^^^^^^^^^^^^^^^^^^^
 */

 // nb: compiled win32 .exe uses ~80k

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

#include "src/libtcc.h"

void addcode(char* src, char* fmt, ...)
{
  va_list va;

  va_start(va, fmt);
  sprintf(src+strlen(src), fmt, va);
  va_end(va);
}

int main(int argc, char *argv[])
{
    TCCState *s;
    //int (*func)(int);
    unsigned long val;
    char* src;

    s = tcc_new();
    if (!s) {
        fprintf(stderr, "Could not create tcc state\n");
        exit(1);
    }

    src = malloc(0x29A*0x29A);
    src[0] = 0;

    addcode(src,"void decrypt(unsigned long ptr, unsigned long count)" );
    addcode(src,"{"                                                    );
    addcode(src,"  unsigned long keys[4];"                             );
    addcode(src,"  keys[0] = 0x11111111;"                              );
    addcode(src,"  keys[1] = 0x22222222;"                              );
    addcode(src,"  keys[2] = 0x33333333;"                              );
    addcode(src,"  keys[3] = 0x44444444;"                              );
    addcode(src,"  count = (count + 3) >> 2;"                          );
    addcode(src,"  while(count--)"                                     );
    addcode(src,"  {"                                                  );
    addcode(src,"    *((unsigned long*)ptr) ^= keys[count % 4];"       );
    addcode(src,"    ptr += 4;"                                        );
    addcode(src,"  }"                                                  );
    addcode(src,"}"                                                    );

    /* MUST BE CALLED before any compilation or file loading */
    tcc_set_output_type(s, TCC_OUTPUT_OBJ);

    tcc_compile_string(s, src/*my_program*/);

    tcc_output_file(s,"1.bin");

    tcc_delete(s);

    exit(0);
    return 0;

} /* main() */

/* EOF */