cairo/test/create-from-broken-png-stream.c

/*
 * Copyright © 2017 Uli Schlachter
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of
 * Red Hat, Inc. not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior
 * permission. Red Hat, Inc. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Author: Uli Schlachter <psychon@znc.in>
 */

#include "cairo-test.h"

#include <stdlib.h>

static const unsigned char broken_png_data[] = {
  0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d,
  0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x02,
  0x08, 0x02, 0x00, 0x00, 0x00, 0xfd, 0xd4, 0x9a, 0xff, 0x00, 0x00, 0x00,
};
static const size_t broken_png_data_length
    = sizeof(broken_png_data) / sizeof(broken_png_data[0]);

static cairo_status_t
read_png_from_data (void *closure, unsigned char *data, unsigned int length)
{
    size_t *offset = closure;
    size_t remaining = broken_png_data_length - *offset;

    if (remaining < length)
	return CAIRO_STATUS_READ_ERROR;

    memcpy (data, &broken_png_data[*offset], length);
    *offset += length;

    return CAIRO_STATUS_SUCCESS;
}

static cairo_test_status_t
preamble (cairo_test_context_t *ctx)
{
    cairo_surface_t *surface;
    cairo_status_t status;
    cairo_status_t expected;
    size_t offset = 0;

    surface = cairo_image_surface_create_from_png_stream (read_png_from_data,
							  &offset);

    expected = CAIRO_STATUS_PNG_ERROR;
    status = cairo_surface_status (surface);
    cairo_surface_destroy (surface);
    if (status != expected) {
	cairo_test_log (ctx,
			"Error: expected error %s, but got %s\n",
			cairo_status_to_string (expected),
			cairo_status_to_string (status));

	return CAIRO_TEST_FAILURE;
    }

    return CAIRO_TEST_SUCCESS;
}

CAIRO_TEST (create_from_broken_png_stream,
	    "Tests the creation of a PNG from malformed data",
	    "png", /* keywords */
	    NULL, /* requirements */
	    0, 0,
	    preamble, NULL)