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Add test for error handling with broken PNG streams

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Would-have-caught: https://bugs.freedesktop.org/show_bug.cgi?id=104325
Signed-off-by: Uli Schlachter <psychon@znc.in>
This commit is contained in:
Uli Schlachter 2017-12-24 13:23:13 +01:00
parent 82f4028532
commit 6b0593827b
2 changed files with 88 additions and 0 deletions
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1
test/Makefile.sources
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@ -87,6 +87,7 @@ test_sources = \
copy-path.c \
coverage.c \
create-for-stream.c \
create-from-broken-png-stream.c \
create-from-png.c \
create-from-png-stream.c \
culled-glyphs.c \

87
test/create-from-broken-png-stream.c Normal file
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@ -0,0 +1,87 @@
/*
* 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);
/* XXX: The actual error is CAIRO_STATUS_PNG_ERROR, but
* _cairo_surface_create_in_error() does not support that.
*/
expected = CAIRO_STATUS_NO_MEMORY;
status = cairo_surface_status (surface);
cairo_surface_destroy (surface);
if (status != CAIRO_STATUS_NO_MEMORY) {
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)