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-rw-r--r--test/text-zero-len.c203
1 files changed, 203 insertions, 0 deletions
diff --git a/test/text-zero-len.c b/test/text-zero-len.c
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+/*
+ * Copyright © 2006 Red Hat, Inc.
+ *
+ * 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: Behdad Esfahbod <behdad@behdad.org>
+ */
+
+/* Related bug 5177
+ *
+ * In short:
+ *
+ * _cairo_atsui_font_text_to_glyph with a zero-sized string crashes.
+ *
+ * Moreover, the fallback path in cairo_scaled_font_text_to_glyphs()
+ * when handling a zero-sized string, allocates a zero-sized glyph array
+ * and when NULL is returned by malloc, recognizes that as an out-of-memory
+ * error. The glibc implementation of malloc() does not return NULL from
+ * malloc(0), but I don't think it's a safe assumption.
+ *
+ * By just bailing out on zero-sized text, we fix both issues.
+ */
+
+#include "cairo-test.h"
+
+#define NUM_TEXT 20
+#define TEXT_SIZE 12
+
+static cairo_bool_t
+text_extents_equal (const cairo_text_extents_t *A,
+ const cairo_text_extents_t *B)
+{
+ return A->x_bearing == B->x_bearing &&
+ A->y_bearing == B->y_bearing &&
+ A->width == B->width &&
+ A->height == B->height &&
+ A->x_advance == B->x_advance &&
+ A->y_advance == B->y_advance;
+}
+
+static cairo_bool_t
+font_extents_equal (const cairo_font_extents_t *A,
+ const cairo_font_extents_t *B)
+{
+ return A->ascent == B->ascent &&
+ A->descent == B->descent &&
+ A->height == B->height &&
+ A->max_x_advance == B->max_x_advance &&
+ A->max_y_advance == B->max_y_advance;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ const cairo_test_context_t *ctx = cairo_test_get_context (cr);
+ cairo_text_extents_t extents, nil_extents;
+ cairo_font_extents_t font_extents, nil_font_extents;
+ cairo_scaled_font_t *scaled_font;
+
+ cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_NORMAL);
+ cairo_set_font_size (cr, 16);
+
+ cairo_move_to (cr, 10, 25);
+ cairo_show_text (cr, NULL);
+ cairo_show_text (cr, "");
+ cairo_show_glyphs (cr, NULL, 0);
+ cairo_show_glyphs (cr, (void*)8, 0);
+
+ cairo_move_to (cr, 10, 55);
+ cairo_text_path (cr, NULL);
+ cairo_text_path (cr, "");
+ cairo_glyph_path (cr, (void*)8, 0);
+ cairo_fill (cr);
+
+ memset (&nil_extents, 0, sizeof (cairo_text_extents_t));
+
+ memset (&extents, 0xff, sizeof (cairo_text_extents_t));
+ cairo_text_extents (cr, "", &extents);
+ if (! text_extents_equal (&extents, &nil_extents)) {
+ cairo_test_log (ctx, "Error: cairo_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n",
+ extents.x_bearing, extents.y_bearing,
+ extents.width, extents.height,
+ extents.x_advance, extents.y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ memset (&extents, 0xff, sizeof (cairo_text_extents_t));
+ cairo_text_extents (cr, NULL, &extents);
+ if (! text_extents_equal (&extents, &nil_extents)) {
+ cairo_test_log (ctx, "Error: cairo_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",
+ extents.x_bearing, extents.y_bearing,
+ extents.width, extents.height,
+ extents.x_advance, extents.y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ memset (&extents, 0xff, sizeof (cairo_text_extents_t));
+ cairo_glyph_extents (cr, (void*)8, 0, &extents);
+ if (! text_extents_equal (&extents, &nil_extents)) {
+ cairo_test_log (ctx, "Error: cairo_glyph_extents(); extents (%g, %g, %g, %g, %g, %g)\n",
+ extents.x_bearing, extents.y_bearing,
+ extents.width, extents.height,
+ extents.x_advance, extents.y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ scaled_font = cairo_get_scaled_font (cr);
+
+ memset (&extents, 0xff, sizeof (cairo_text_extents_t));
+ cairo_scaled_font_text_extents (scaled_font, "", &extents);
+ if (! text_extents_equal (&extents, &nil_extents)) {
+ cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n",
+ extents.x_bearing, extents.y_bearing,
+ extents.width, extents.height,
+ extents.x_advance, extents.y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ memset (&extents, 0xff, sizeof (cairo_text_extents_t));
+ cairo_scaled_font_text_extents (scaled_font, NULL, &extents);
+ if (! text_extents_equal (&extents, &nil_extents)) {
+ cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",
+ extents.x_bearing, extents.y_bearing,
+ extents.width, extents.height,
+ extents.x_advance, extents.y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ memset (&extents, 0xff, sizeof (cairo_text_extents_t));
+ cairo_scaled_font_glyph_extents (scaled_font, (void*)8, 0, &extents);
+ if (! text_extents_equal (&extents, &nil_extents)) {
+ cairo_test_log (ctx, "Error: cairo_scaled_font_glyph_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",
+ extents.x_bearing, extents.y_bearing,
+ extents.width, extents.height,
+ extents.x_advance, extents.y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ /* Lets also try font size 0 while here */
+ cairo_set_font_size (cr, 0);
+
+ memset (&extents, 0xff, sizeof (cairo_text_extents_t));
+ cairo_text_extents (cr, "test", &extents);
+ if (! text_extents_equal (&extents, &nil_extents)) {
+ cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_text_extents(\"test\"); extents (%g, %g, %g, %g, %g, %g)\n",
+ extents.x_bearing, extents.y_bearing,
+ extents.width, extents.height,
+ extents.x_advance, extents.y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ memset (&nil_font_extents, 0, sizeof (cairo_font_extents_t));
+
+ memset (&font_extents, 0xff, sizeof (cairo_font_extents_t));
+ cairo_font_extents (cr, &font_extents);
+ if (! font_extents_equal (&font_extents, &nil_font_extents)) {
+ cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_font_extents(); extents (%g, %g, %g, %g, %g)\n",
+ font_extents.ascent, font_extents.descent,
+ font_extents.height,
+ font_extents.max_x_advance, font_extents.max_y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ scaled_font = cairo_get_scaled_font (cr);
+
+ memset (&font_extents, 0xff, sizeof (cairo_font_extents_t));
+ cairo_scaled_font_extents (scaled_font, &font_extents);
+ if (! font_extents_equal (&font_extents, &nil_font_extents)) {
+ cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_scaled_font_extents(); extents (%g, %g, %g, %g, %g)\n",
+ font_extents.ascent, font_extents.descent,
+ font_extents.height,
+ font_extents.max_x_advance, font_extents.max_y_advance);
+ return CAIRO_TEST_FAILURE;
+ }
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (text_zero_len,
+ "Tests show_text and text_path with a zero-sized string",
+ "text, stress, extents", /* keywords */
+ NULL, /* requirements */
+ 0, 0,
+ NULL, draw)
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