[cairo-commit] test/create-from-broken-png-stream.c test/Makefile.sources

[Uli Schlachter]

 test/Makefile.sources                |    1 
 test/create-from-broken-png-stream.c |   87 +++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)

New commits:
commit 6b0593827b072abd701ea47448981bcc9bdde9f3
Author: Uli Schlachter <psychon at znc.in>
Date:   Sun Dec 24 13:23:13 2017 +0100

    Add test for error handling with broken PNG streams
    
    Would-have-caught: https://bugs.freedesktop.org/show_bug.cgi?id=104325
    Signed-off-by: Uli Schlachter <psychon at znc.in>

diff --git a/test/Makefile.sources b/test/Makefile.sources
index a3134d51..5e9aeaaa 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -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					\
diff --git a/test/create-from-broken-png-stream.c b/test/create-from-broken-png-stream.c
new file mode 100644
index 00000000..7c02a263
--- /dev/null
+++ b/test/create-from-broken-png-stream.c
@@ -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 at 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)