JNIEXPORT jdouble JNICALL Java_AutoSteg_spotf5(JNIEnv *env, jclass clazz, jstring name){
char *filename = (*env)->GetStringUTFChars(env, name, NULL);
double beta;
if (jpg_open(filename) == -1) {
printf("Couldn't open %s\n", filename);
return beta == -1;
}
beta = detect_f5(filename);
char tmp[80];
int stars;
char outbuf[1024];
sprintf(outbuf, "%s :", filename);
if (beta < 0.25) {
//no f5 detected
} else {
//f5 detected
stars = 1;
if (beta > 0.25)
stars++;
if (beta > 0.4)
stars++;
snprintf(tmp, sizeof(tmp), "\n\tCODE RED CODE RED: f5[%f] DETECTED", beta);
//strlcat(outbuf, quality(tmp, stars), sizeof(outbuf));
//printf("%s\n", outbuf);
}
return beta;
}
int main(int argc, char *argv[]) {
if( argc <= 1 ) {
printf("usage: %s image.jpeg\n", argv[0]);
exit(1);
}
argc--;
while(argc > 0) {
argc--;
argv++;
char *name = argv[0];
printf("looking for f5 in: %s\n", name);
if (jpg_open(name) == -1) {
printf("Couldn't open %s\n", name);
continue;
}
double beta = detect_f5(name);
char tmp[80];
int stars;
char outbuf[1024];
sprintf(outbuf, "%s :", name);
if (beta < 0.25) {
// no f5
} else {
//f5 detected
stars = 1;
if (beta > 0.25)
stars++;
if (beta > 0.4)
stars++;
snprintf(tmp, sizeof(tmp), "\n\tCODE RED CODE RED: f5[%f] DETECTED", beta);
strlcat(outbuf, quality(tmp, stars), sizeof(outbuf));
printf("%s\n", outbuf);
}
}
}
void
docompare(char *file1, char *file2)
{
int i;
int bits1, bits2, count, last, sumlast;
int hist1[257], hist2[257];
int shist[257], shist1[257], shist2[257];
float ratio;
int one;
short *dcts1, *dcts2;
dcts1 = dcts2 = NULL;
/* Open first file */
if (jpg_open(file1) == -1)
goto out;
if (scans & FLAG_DOJPHIDE)
prepare_jphide(&dcts1, &bits1);
else
prepare_all(&dcts1, &bits1);
jpg_finish();
jpg_destroy();
/* Open second file */
if (jpg_open(file2) == -1)
goto out;
if (scans & FLAG_DOJPHIDE)
prepare_jphide(&dcts2, &bits2);
else
prepare_all(&dcts2, &bits2);
jpg_finish();
jpg_destroy();
if (bits1 != bits2) {
warnx("Size of images differs: %d != %d", bits1, bits2);
goto out;
}
fprintf(stdout, "Size: %d\n", bits1);
memset(hist, 0, sizeof(hist));
memset(hist1, 0, sizeof(hist1));
memset(hist2, 0, sizeof(hist2));
last = -1;
sumlast = 0;
count = 0;
one = 0;
ratio = 0.5;
for (i = 0; i < bits1; i++) {
if (dcts1[i] >= -127 &&
dcts1[i] <= 127)
hist1[dcts1[i] + 128]++;
if (dcts2[i] >= -127 &&
dcts2[i] <= 127)
hist2[dcts2[i] + 128]++;
if (abs(dcts2[i]) & 1)
one++;
if ((i % 500) == 0 && i) {
ratio = 0.7*ratio + 0.3*((float)one/500);
one = 0;
}
if (dcts1[i] != dcts2[i]) {
unsigned short first, second;
count++;
/* jphide */
if (scans & FLAG_DOJPHIDE) {
first = dcts1[i] > 0 ? dcts1[i] : -dcts1[i];
second = dcts2[i] > 0 ? dcts2[i] : -dcts2[i];
} else {
/* outguess */
first = dcts1[i];
second = dcts2[i];
}
sumlast += last >= 0 ? i - last : 0;
if ((scans & FLAG_HIST) == 0) {
fprintf(stdout,
"% 9d: % 5d != % 5d: %0x | % 5d : %7.2f| %4.2f\n",
i, dcts1[i], dcts2[i], first ^ second,
last >= 0 ? i - last : 0,
(float)sumlast/count,
ratio);
}
last = i;
if (dcts1[i] >= -127 &&
dcts1[i] <= 127)
hist[dcts1[i] + 128]++;
if (scans & FLAG_DOJPHIDE) {
memcpy(shist, hist, sizeof(shist));
memcpy(shist1, hist1, sizeof(shist1));
memcpy(shist2, hist2, sizeof(shist2));
}
}
}
if (scans & FLAG_DOJPHIDE) {
memcpy(hist, shist, sizeof(hist));
memcpy(hist1, shist1, sizeof(hist1));
memcpy(hist2, shist2, sizeof(hist2));
}
if (scans & FLAG_HIST) {
for (i = 0; i <= 256; i++)
fprintf(stdout, "% 4d % 5d % 5d\n",
i - 128, hist1[i], hist2[i]);
goto out;
}
fprintf(stdout, "Total changes: %d bits, %d bytes\n",
count, count/8);
for (i = 0; i <= 256; i++)
list[i] = i;
qsort(list, sizeof(list)/sizeof(int), sizeof(int),
compare);
fprintf(stdout, "Histogram of changes to coefficients:\n");
for (i = 0; i <= 256; i++)
if (hist[list[i]])
fprintf(stdout,
"% 4d: % 5d(%.3f) | %6.3f%% || % 7d | % 7d : %7.3f%%\n",
list[i] - 128,
hist[list[i]], (float)hist[list[i]]/hist1[list[i]],
(float)hist[list[i]]/count * 100,
hist1[list[i]], hist2[list[i]],
(float)(hist2[list[i]] - hist1[list[i]])/
hist1[list[i]] * 100);
fprintf(stdout, "Histogram of changes to coefficients (in order):\n");
for (i = 0; i <= 256; i++)
if (hist[i])
fprintf(stdout,
"% 4d: % 5d(%.3f) | %6.3f%% || % 7d | % 7d : %7.3f%%\n",
i - 128,
hist[i], (float)hist[i]/hist1[i],
(float)hist[i]/count * 100,
hist1[i], hist2[i],
(float)(hist2[i] - hist1[i])/
hist1[i] * 100);
out:
if (dcts1)
free(dcts1);
if (dcts2)
free(dcts2);
}