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/**
* Test for uninitialized color map entries
*
* We're reading a crafted GIF which consists of 16x16 color blocks and which
* has only two palette entries in the global color map, but uses other palette
* indexes as well. We verify whether all undefined palette indexes produce the
* color black.
*
* See also <CAKm_7a-AO++B6cXYWM_DtycPENG5WNWK7NSEvQ5OmZziMY_JyA@mail.gmail.com>
* which had been sent to security@libgd.org.
*/
#include "gd.h"
#include "gdtest.h"
int main()
{
gdImagePtr im;
FILE *fp;
int i, j, col;
fp = gdTestFileOpen2("gif", "unitialized_memory_read.gif");
gdTestAssert(fp != NULL);
im = gdImageCreateFromGif(fp);
gdTestAssert(im != NULL);
fclose(fp);
for (i = 0; i < gdImageSX(im); i += 16) {
for (j = 0; j < gdImageSY(im); j += 16) {
if (gdImageGetPixel(im, i, j) >= 2) {
col = gdImageGetTrueColorPixel(im, i, j);
gdTestAssertMsg(col == 0, "(%d,%d): expected color 0, but got %d\n", i, j, col);
}
}
}
gdImageDestroy(im);
return gdNumFailures();
}
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