test/test-buffer.c - third_party/harfbuzz - Git at Google

 /*
  * 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-test.h"

 /* This file tests types defined in hb-buffer.h */


 static const char utf8[10] = "ab\360\240\200\200defg";
 static const uint16_t utf16[8] = {'a', 'b', 0xD840, 0xDC00, 'd', 'e', 'f', 'g'};
 static const uint32_t utf32[7] = {'a', 'b', 0x20000, 'd', 'e', 'f', 'g'};

 typedef enum {
   BUFFER_EMPTY,
   BUFFER_ONE_BY_ONE,
   BUFFER_UTF32,
   BUFFER_UTF16,
   BUFFER_UTF8,
   BUFFER_NUM_TYPES,
 } buffer_type_t;

 static const char *buffer_names[] = {
   "empty",
   "one-by-one",
   "utf32",
   "utf16",
   "utf8"
 };

 typedef struct
 {
   hb_buffer_t *b;
 } fixture_t;

 static void
 fixture_init (fixture_t *fixture, gconstpointer user_data)
 {
   unsigned int i;

   fixture->b = hb_buffer_create (0);

   switch (GPOINTER_TO_INT (user_data)) {
     case BUFFER_EMPTY:
       break;

     case BUFFER_ONE_BY_ONE:
       for (i = 1; i < G_N_ELEMENTS (utf32) - 1; i++)
 	hb_buffer_add (fixture->b, utf32[i], 1, i);
       break;

     case BUFFER_UTF32:
       hb_buffer_add_utf32 (fixture->b, utf32, G_N_ELEMENTS (utf32), 1, G_N_ELEMENTS (utf32) - 2);
       break;

     case BUFFER_UTF16:
       hb_buffer_add_utf16 (fixture->b, utf16, G_N_ELEMENTS (utf16), 1, G_N_ELEMENTS (utf16) - 2);
       break;

     case BUFFER_UTF8:
       hb_buffer_add_utf8  (fixture->b, utf8,  G_N_ELEMENTS (utf8),  1, G_N_ELEMENTS (utf8)  - 2);
       break;

     default:
       g_assert_not_reached ();
   }
 }

 static void
 fixture_fini (fixture_t *fixture, gconstpointer user_data)
 {
   hb_buffer_destroy (fixture->b);
 }


 static void
 test_buffer_properties (fixture_t *fixture, gconstpointer user_data)
 {
   hb_unicode_funcs_t *ufuncs;

   /* test default properties */

   g_assert (hb_buffer_get_unicode_funcs (fixture->b) == hb_unicode_funcs_get_default ());
   g_assert (hb_buffer_get_direction (fixture->b) == HB_DIRECTION_INVALID);
   g_assert (hb_buffer_get_script (fixture->b) == HB_SCRIPT_INVALID);
   g_assert (hb_buffer_get_language (fixture->b) == NULL);


   /* test property changes are retained */
   ufuncs = hb_unicode_funcs_create (NULL);
   hb_buffer_set_unicode_funcs (fixture->b, ufuncs);
   hb_unicode_funcs_destroy (ufuncs);
   g_assert (hb_buffer_get_unicode_funcs (fixture->b) == ufuncs);

   hb_buffer_set_direction (fixture->b, HB_DIRECTION_RTL);
   g_assert (hb_buffer_get_direction (fixture->b) == HB_DIRECTION_RTL);

   hb_buffer_set_script (fixture->b, HB_SCRIPT_ARABIC);
   g_assert (hb_buffer_get_script (fixture->b) == HB_SCRIPT_ARABIC);

   hb_buffer_set_language (fixture->b, hb_language_from_string ("fa"));
   g_assert (hb_buffer_get_language (fixture->b) == hb_language_from_string ("Fa"));


   /* test reset clears properties */

   hb_buffer_reset (fixture->b);

   g_assert (hb_buffer_get_unicode_funcs (fixture->b) == hb_unicode_funcs_get_default ());
   g_assert (hb_buffer_get_direction (fixture->b) == HB_DIRECTION_INVALID);
   g_assert (hb_buffer_get_script (fixture->b) == HB_SCRIPT_INVALID);
   g_assert (hb_buffer_get_language (fixture->b) == NULL);
 }

 static void
 test_buffer_contents (fixture_t *fixture, gconstpointer user_data)
 {
   unsigned int i, len, len2;
   buffer_type_t buffer_type = GPOINTER_TO_INT (user_data);
   hb_glyph_info_t *glyphs;

   if (buffer_type == BUFFER_EMPTY) {
     g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
     return;
   }

   len = hb_buffer_get_length (fixture->b);
   glyphs = hb_buffer_get_glyph_infos (fixture->b, NULL); /* test NULL */
   glyphs = hb_buffer_get_glyph_infos (fixture->b, &len2);
   g_assert_cmpint (len, ==, len2);
   g_assert_cmpint (len, ==, 5);

   for (i = 0; i < len; i++) {
     g_assert_cmphex (glyphs[i].mask,      ==, 1);
     g_assert_cmphex (glyphs[i].var1.u32,  ==, 0);
     g_assert_cmphex (glyphs[i].var2.u32,  ==, 0);
   }

   for (i = 0; i < len; i++) {
     unsigned int cluster;
     cluster = 1+i;
     if (i >= 2) {
       if (buffer_type == BUFFER_UTF16)
 	cluster++;
       else if (buffer_type == BUFFER_UTF8)
         cluster += 3;
     }
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);
     g_assert_cmphex (glyphs[i].cluster,   ==, cluster);
   }

   /* reverse, test, and reverse back */

   hb_buffer_reverse (fixture->b);
   for (i = 0; i < len; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[len-i]);

   hb_buffer_reverse (fixture->b);
   for (i = 0; i < len; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);

   /* reverse_clusters works same as reverse for now since each codepoint is
    * in its own cluster */

   hb_buffer_reverse_clusters (fixture->b);
   for (i = 0; i < len; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[len-i]);

   hb_buffer_reverse_clusters (fixture->b);
   for (i = 0; i < len; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);

   /* now form a cluster and test again */
   glyphs[2].cluster = glyphs[1].cluster;

   /* reverse, test, and reverse back */

   hb_buffer_reverse (fixture->b);
   for (i = 0; i < len; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[len-i]);

   hb_buffer_reverse (fixture->b);
   for (i = 0; i < len; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);

   /* reverse_clusters twice still should return the original string,
    * but when applied once, the 1-2 cluster should be retained. */

   hb_buffer_reverse_clusters (fixture->b);
   for (i = 0; i < len; i++) {
     unsigned int j = len-1-i;
     if (j == 1)
       j = 2;
     else if (j == 2)
       j = 1;
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+j]);
   }

   hb_buffer_reverse_clusters (fixture->b);
   for (i = 0; i < len; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);


   /* test setting length */

   /* enlarge */
   g_assert (hb_buffer_set_length (fixture->b, 10));
   glyphs = hb_buffer_get_glyph_infos (fixture->b, NULL);
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 10);
   for (i = 0; i < 5; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);
   for (i = 5; i < 10; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, 0);
   /* shrink */
   g_assert (hb_buffer_set_length (fixture->b, 3));
   glyphs = hb_buffer_get_glyph_infos (fixture->b, NULL);
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 3);
   for (i = 0; i < 3; i++)
     g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);


   g_assert (hb_buffer_allocation_successful (fixture->b));


   /* test reset clears content */

   hb_buffer_reset (fixture->b);
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
 }

 static void
 test_buffer_positions (fixture_t *fixture, gconstpointer user_data)
 {
   unsigned int i, len, len2;
   hb_glyph_position_t *positions;

   /* Without shaping, positions should all be zero */
   len = hb_buffer_get_length (fixture->b);
   positions = hb_buffer_get_glyph_positions (fixture->b, NULL); /* test NULL */
   positions = hb_buffer_get_glyph_positions (fixture->b, &len2);
   g_assert_cmpint (len, ==, len2);
   for (i = 0; i < len; i++) {
     g_assert_cmpint (0, ==, positions[i].x_advance);
     g_assert_cmpint (0, ==, positions[i].y_advance);
     g_assert_cmpint (0, ==, positions[i].x_offset);
     g_assert_cmpint (0, ==, positions[i].y_offset);
     g_assert_cmpint (0, ==, positions[i].var.i32);
   }

   /* test reset clears content */
   hb_buffer_reset (fixture->b);
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
 }

 static void
 test_buffer_allocation (fixture_t *fixture, gconstpointer user_data)
 {
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);

   g_assert (hb_buffer_pre_allocate (fixture->b, 100));
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
   g_assert (hb_buffer_allocation_successful (fixture->b));

   /* lets try a huge allocation, make sure it fails */
   g_assert (!hb_buffer_pre_allocate (fixture->b, (unsigned int) -1));
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
   g_assert (!hb_buffer_allocation_successful (fixture->b));

   /* small one again */
   g_assert (hb_buffer_pre_allocate (fixture->b, 50));
   g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
   g_assert (!hb_buffer_allocation_successful (fixture->b));

   hb_buffer_reset (fixture->b);
   g_assert (hb_buffer_allocation_successful (fixture->b));

   /* all allocation and size  */
   g_assert (!hb_buffer_pre_allocate (fixture->b, ((unsigned int) -1) / 20 + 1));
   g_assert (!hb_buffer_allocation_successful (fixture->b));

   hb_buffer_reset (fixture->b);
   g_assert (hb_buffer_allocation_successful (fixture->b));

   /* technically, this one can actually pass on 64bit machines, but
    * I'm doubtful that any malloc allows 4GB allocations at a time.
    * But let's only enable it on a 32-bit machine. */
   if (sizeof (long) == 4) {
     g_assert (!hb_buffer_pre_allocate (fixture->b, ((unsigned int) -1) / 20 - 1));
     g_assert (!hb_buffer_allocation_successful (fixture->b));
   }

   hb_buffer_reset (fixture->b);
   g_assert (hb_buffer_allocation_successful (fixture->b));
 }


 int
 main (int argc, char **argv)
 {
   int i;

   g_test_init (&argc, &argv, NULL);

   for (i = 0; i < BUFFER_NUM_TYPES; i++) {
 #define TEST_ADD(path, func) \
     G_STMT_START { \
       char *s = g_strdup_printf ("%s/%s", path, buffer_names[i]); \
       g_test_add (s, fixture_t, GINT_TO_POINTER (i), fixture_init, func, fixture_fini); \
       g_free (s); \
     } G_STMT_END
     TEST_ADD ("/buffer/properties", test_buffer_properties);
     TEST_ADD ("/buffer/contents", test_buffer_contents);
     TEST_ADD ("/buffer/positions", test_buffer_positions);
 #undef TEST_ADD
   }

   g_test_add ("/buffer/allocation", fixture_t, GINT_TO_POINTER (BUFFER_EMPTY), fixture_init, test_buffer_allocation, fixture_fini);

   /* XXX test invalid UTF-8 / UTF-16 text input (also overlong sequences) */

   return g_test_run();
 }
	/*
	* 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-test.h"

	/* This file tests types defined in hb-buffer.h */


	static const char utf8[10] = "ab\360\240\200\200defg";
	static const uint16_t utf16[8] = {'a', 'b', 0xD840, 0xDC00, 'd', 'e', 'f', 'g'};
	static const uint32_t utf32[7] = {'a', 'b', 0x20000, 'd', 'e', 'f', 'g'};

	typedef enum {
	BUFFER_EMPTY,
	BUFFER_ONE_BY_ONE,
	BUFFER_UTF32,
	BUFFER_UTF16,
	BUFFER_UTF8,
	BUFFER_NUM_TYPES,
	} buffer_type_t;

	static const char *buffer_names[] = {
	"empty",
	"one-by-one",
	"utf32",
	"utf16",
	"utf8"
	};

	typedef struct
	{
	hb_buffer_t *b;
	} fixture_t;

	static void
	fixture_init (fixture_t *fixture, gconstpointer user_data)
	{
	unsigned int i;

	fixture->b = hb_buffer_create (0);

	switch (GPOINTER_TO_INT (user_data)) {
	case BUFFER_EMPTY:
	break;

	case BUFFER_ONE_BY_ONE:
	for (i = 1; i < G_N_ELEMENTS (utf32) - 1; i++)
	hb_buffer_add (fixture->b, utf32[i], 1, i);
	break;

	case BUFFER_UTF32:
	hb_buffer_add_utf32 (fixture->b, utf32, G_N_ELEMENTS (utf32), 1, G_N_ELEMENTS (utf32) - 2);
	break;

	case BUFFER_UTF16:
	hb_buffer_add_utf16 (fixture->b, utf16, G_N_ELEMENTS (utf16), 1, G_N_ELEMENTS (utf16) - 2);
	break;

	case BUFFER_UTF8:
	hb_buffer_add_utf8 (fixture->b, utf8, G_N_ELEMENTS (utf8), 1, G_N_ELEMENTS (utf8) - 2);
	break;

	default:
	g_assert_not_reached ();
	}
	}

	static void
	fixture_fini (fixture_t *fixture, gconstpointer user_data)
	{
	hb_buffer_destroy (fixture->b);
	}


	static void
	test_buffer_properties (fixture_t *fixture, gconstpointer user_data)
	{
	hb_unicode_funcs_t *ufuncs;

	/* test default properties */

	g_assert (hb_buffer_get_unicode_funcs (fixture->b) == hb_unicode_funcs_get_default ());
	g_assert (hb_buffer_get_direction (fixture->b) == HB_DIRECTION_INVALID);
	g_assert (hb_buffer_get_script (fixture->b) == HB_SCRIPT_INVALID);
	g_assert (hb_buffer_get_language (fixture->b) == NULL);


	/* test property changes are retained */
	ufuncs = hb_unicode_funcs_create (NULL);
	hb_buffer_set_unicode_funcs (fixture->b, ufuncs);
	hb_unicode_funcs_destroy (ufuncs);
	g_assert (hb_buffer_get_unicode_funcs (fixture->b) == ufuncs);

	hb_buffer_set_direction (fixture->b, HB_DIRECTION_RTL);
	g_assert (hb_buffer_get_direction (fixture->b) == HB_DIRECTION_RTL);

	hb_buffer_set_script (fixture->b, HB_SCRIPT_ARABIC);
	g_assert (hb_buffer_get_script (fixture->b) == HB_SCRIPT_ARABIC);

	hb_buffer_set_language (fixture->b, hb_language_from_string ("fa"));
	g_assert (hb_buffer_get_language (fixture->b) == hb_language_from_string ("Fa"));


	/* test reset clears properties */

	hb_buffer_reset (fixture->b);

	g_assert (hb_buffer_get_unicode_funcs (fixture->b) == hb_unicode_funcs_get_default ());
	g_assert (hb_buffer_get_direction (fixture->b) == HB_DIRECTION_INVALID);
	g_assert (hb_buffer_get_script (fixture->b) == HB_SCRIPT_INVALID);
	g_assert (hb_buffer_get_language (fixture->b) == NULL);
	}

	static void
	test_buffer_contents (fixture_t *fixture, gconstpointer user_data)
	{
	unsigned int i, len, len2;
	buffer_type_t buffer_type = GPOINTER_TO_INT (user_data);
	hb_glyph_info_t *glyphs;

	if (buffer_type == BUFFER_EMPTY) {
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
	return;
	}

	len = hb_buffer_get_length (fixture->b);
	glyphs = hb_buffer_get_glyph_infos (fixture->b, NULL); /* test NULL */
	glyphs = hb_buffer_get_glyph_infos (fixture->b, &len2);
	g_assert_cmpint (len, ==, len2);
	g_assert_cmpint (len, ==, 5);

	for (i = 0; i < len; i++) {
	g_assert_cmphex (glyphs[i].mask, ==, 1);
	g_assert_cmphex (glyphs[i].var1.u32, ==, 0);
	g_assert_cmphex (glyphs[i].var2.u32, ==, 0);
	}

	for (i = 0; i < len; i++) {
	unsigned int cluster;
	cluster = 1+i;
	if (i >= 2) {
	if (buffer_type == BUFFER_UTF16)
	cluster++;
	else if (buffer_type == BUFFER_UTF8)
	cluster += 3;
	}
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);
	g_assert_cmphex (glyphs[i].cluster, ==, cluster);
	}

	/* reverse, test, and reverse back */

	hb_buffer_reverse (fixture->b);
	for (i = 0; i < len; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[len-i]);

	hb_buffer_reverse (fixture->b);
	for (i = 0; i < len; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);

	/* reverse_clusters works same as reverse for now since each codepoint is
	* in its own cluster */

	hb_buffer_reverse_clusters (fixture->b);
	for (i = 0; i < len; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[len-i]);

	hb_buffer_reverse_clusters (fixture->b);
	for (i = 0; i < len; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);

	/* now form a cluster and test again */
	glyphs[2].cluster = glyphs[1].cluster;

	/* reverse, test, and reverse back */

	hb_buffer_reverse (fixture->b);
	for (i = 0; i < len; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[len-i]);

	hb_buffer_reverse (fixture->b);
	for (i = 0; i < len; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);

	/* reverse_clusters twice still should return the original string,
	* but when applied once, the 1-2 cluster should be retained. */

	hb_buffer_reverse_clusters (fixture->b);
	for (i = 0; i < len; i++) {
	unsigned int j = len-1-i;
	if (j == 1)
	j = 2;
	else if (j == 2)
	j = 1;
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+j]);
	}

	hb_buffer_reverse_clusters (fixture->b);
	for (i = 0; i < len; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);


	/* test setting length */

	/* enlarge */
	g_assert (hb_buffer_set_length (fixture->b, 10));
	glyphs = hb_buffer_get_glyph_infos (fixture->b, NULL);
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 10);
	for (i = 0; i < 5; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);
	for (i = 5; i < 10; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, 0);
	/* shrink */
	g_assert (hb_buffer_set_length (fixture->b, 3));
	glyphs = hb_buffer_get_glyph_infos (fixture->b, NULL);
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 3);
	for (i = 0; i < 3; i++)
	g_assert_cmphex (glyphs[i].codepoint, ==, utf32[1+i]);


	g_assert (hb_buffer_allocation_successful (fixture->b));


	/* test reset clears content */

	hb_buffer_reset (fixture->b);
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
	}

	static void
	test_buffer_positions (fixture_t *fixture, gconstpointer user_data)
	{
	unsigned int i, len, len2;
	hb_glyph_position_t *positions;

	/* Without shaping, positions should all be zero */
	len = hb_buffer_get_length (fixture->b);
	positions = hb_buffer_get_glyph_positions (fixture->b, NULL); /* test NULL */
	positions = hb_buffer_get_glyph_positions (fixture->b, &len2);
	g_assert_cmpint (len, ==, len2);
	for (i = 0; i < len; i++) {
	g_assert_cmpint (0, ==, positions[i].x_advance);
	g_assert_cmpint (0, ==, positions[i].y_advance);
	g_assert_cmpint (0, ==, positions[i].x_offset);
	g_assert_cmpint (0, ==, positions[i].y_offset);
	g_assert_cmpint (0, ==, positions[i].var.i32);
	}

	/* test reset clears content */
	hb_buffer_reset (fixture->b);
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
	}

	static void
	test_buffer_allocation (fixture_t *fixture, gconstpointer user_data)
	{
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);

	g_assert (hb_buffer_pre_allocate (fixture->b, 100));
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
	g_assert (hb_buffer_allocation_successful (fixture->b));

	/* lets try a huge allocation, make sure it fails */
	g_assert (!hb_buffer_pre_allocate (fixture->b, (unsigned int) -1));
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
	g_assert (!hb_buffer_allocation_successful (fixture->b));

	/* small one again */
	g_assert (hb_buffer_pre_allocate (fixture->b, 50));
	g_assert_cmpint (hb_buffer_get_length (fixture->b), ==, 0);
	g_assert (!hb_buffer_allocation_successful (fixture->b));

	hb_buffer_reset (fixture->b);
	g_assert (hb_buffer_allocation_successful (fixture->b));

	/* all allocation and size */
	g_assert (!hb_buffer_pre_allocate (fixture->b, ((unsigned int) -1) / 20 + 1));
	g_assert (!hb_buffer_allocation_successful (fixture->b));

	hb_buffer_reset (fixture->b);
	g_assert (hb_buffer_allocation_successful (fixture->b));

	/* technically, this one can actually pass on 64bit machines, but
	* I'm doubtful that any malloc allows 4GB allocations at a time.
	* But let's only enable it on a 32-bit machine. */
	if (sizeof (long) == 4) {
	g_assert (!hb_buffer_pre_allocate (fixture->b, ((unsigned int) -1) / 20 - 1));
	g_assert (!hb_buffer_allocation_successful (fixture->b));
	}

	hb_buffer_reset (fixture->b);
	g_assert (hb_buffer_allocation_successful (fixture->b));
	}


	int
	main (int argc, char **argv)
	{
	int i;

	g_test_init (&argc, &argv, NULL);

	for (i = 0; i < BUFFER_NUM_TYPES; i++) {
	#define TEST_ADD(path, func) \
	G_STMT_START { \
	char *s = g_strdup_printf ("%s/%s", path, buffer_names[i]); \
	g_test_add (s, fixture_t, GINT_TO_POINTER (i), fixture_init, func, fixture_fini); \
	g_free (s); \
	} G_STMT_END
	TEST_ADD ("/buffer/properties", test_buffer_properties);
	TEST_ADD ("/buffer/contents", test_buffer_contents);
	TEST_ADD ("/buffer/positions", test_buffer_positions);
	#undef TEST_ADD
	}

	g_test_add ("/buffer/allocation", fixture_t, GINT_TO_POINTER (BUFFER_EMPTY), fixture_init, test_buffer_allocation, fixture_fini);

	/* XXX test invalid UTF-8 / UTF-16 text input (also overlong sequences) */

	return g_test_run();
	}