[meta] Add a test program for metadata

src/Makefile.am

@@ -332,6 +332,7 @@ noinst_PROGRAMS = \
 	main \
 	test \
 	test-buffer-serialize \
+	test-ot-metadata \
 	test-ot-name \
 	test-gpos-size-params \
 	test-gsub-would-substitute \
@@ -350,6 +351,10 @@ test_buffer_serialize_SOURCES = test-buffer-serialize.cc
 test_buffer_serialize_CPPFLAGS = $(HBCFLAGS)
 test_buffer_serialize_LDADD = libharfbuzz.la $(HBLIBS)
 
+test_ot_metadata_SOURCES = test-ot-metadata.cc
+test_ot_metadata_CPPFLAGS = $(HBCFLAGS)
+test_ot_metadata_LDADD = libharfbuzz.la $(HBLIBS)
+
 test_ot_name_SOURCES = test-ot-name.cc
 test_ot_name_CPPFLAGS = $(HBCFLAGS)
 test_ot_name_LDADD = libharfbuzz.la $(HBLIBS)

src/test-ot-metadata.cc

@@ -0,0 +1,70 @@
+/*
+ * Copyright © 2019  Ebrahim Byagowi
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#include "hb.hh"
+#include "hb-ot.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef HB_NO_OPEN
+#define hb_blob_create_from_file(x)  hb_blob_get_empty ()
+#endif
+
+int
+main (int argc, char **argv)
+{
+  if (argc != 2) {
+    fprintf (stderr, "usage: %s font-file\n", argv[0]);
+    exit (1);
+  }
+
+  hb_blob_t *blob = hb_blob_create_from_file (argv[1]);
+  hb_face_t *face = hb_face_create (blob, 0 /* first face */);
+  hb_blob_destroy (blob);
+  blob = nullptr;
+
+  unsigned int count = 0;
+
+#ifndef HB_NO_META
+  count = hb_ot_metadata_get_entries (face, 0, nullptr, nullptr);
+
+  hb_ot_metadata_t *tags = (hb_ot_metadata_t *)
+			   malloc (sizeof (hb_ot_metadata_t) * count);
+  hb_ot_metadata_get_entries (face, 0, &count, tags);
+  for (unsigned i = 0; i < count; ++i)
+  {
+    hb_blob_t *entry = hb_ot_metadata_reference_entry (face, tags[i]);
+    printf ("%c%c%c%c, size: %d: %.*s\n",
+	    HB_UNTAG (tags[i]), hb_blob_get_length (entry),
+	    hb_blob_get_length (entry), hb_blob_get_data (entry, nullptr));
+    hb_blob_destroy (entry);
+  }
+  free (tags);
+#endif
+
+  hb_face_destroy (face);
+
+  return !count;
+}