[util] Add hb-shape utility

Like hb-view, but prints out buffer contents.

The output format is kinda cryptic.  Suggestions welcome.

util/hb-shape.cc

diff --git a/util/hb-shape.cc b/util/hb-shape.cc
new file mode 100644
index 0000000..906bac2
--- /dev/null
+++ b/util/hb-shape.cc
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2010  Behdad Esfahbod
+ * Copyright © 2011  Google, Inc.
+ *
+ *  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.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-view.hh"
+
+struct output_buffer_t : output_options_t, format_options_t
+{
+  output_buffer_t (option_parser_t *parser)
+		  : output_options_t (parser),
+		    format_options_t (parser) {}
+
+  void init (const font_options_t *font_opts);
+  void consume_line (hb_buffer_t  *buffer,
+		     const char   *text,
+		     unsigned int  text_len);
+  void finish (const font_options_t *font_opts);
+
+  protected:
+  GString *gs;
+  hb_font_t *font;
+};
+
+void
+output_buffer_t::init (const font_options_t *font_opts)
+{
+  get_file_handle ();
+  font = hb_font_reference (font_opts->get_font ());
+  gs = g_string_new (NULL);
+}
+
+void
+output_buffer_t::consume_line (hb_buffer_t  *buffer,
+			       const char   *text,
+			       unsigned int  text_len)
+{
+  g_string_set_size (gs, 0);
+  serialize (buffer, font, gs);
+  fprintf (fp, "%s\n", gs->str);
+}
+
+void
+output_buffer_t::finish (const font_options_t *font_opts)
+{
+  g_string_free (gs, TRUE);
+  gs = NULL;
+  hb_font_destroy (font);
+  font = NULL;
+}
+
+int
+main (int argc, char **argv)
+{
+  return hb_view_t<output_buffer_t>::main (argc, argv);
+}