/**

 * 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();

}