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/*
* Copyright © 2025 Luca Bacci
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <glib.h>
#include <glib/gunicodeprivate.h>
static void
test_utf8_to_utf16_make_valid (void)
{
#define MAKE_ENTRY(string, string_is_valid_utf8) \
{string, string_is_valid_utf8, NULL, 0}
#define MAKE_VALID_UTF8_ENTRY(string) \
MAKE_ENTRY(string, TRUE)
#define MAKE_INVALID_UTF8_ENTRY(string) \
MAKE_ENTRY(string, FALSE)
struct {
const char *utf8;
gboolean utf8_is_valid;
gunichar2 *utf16;
glong utf16_length;
} strings[] = {
MAKE_VALID_UTF8_ENTRY ("hello"),
MAKE_INVALID_UTF8_ENTRY ("\xf4\xf4\xf4"),
MAKE_VALID_UTF8_ENTRY ("world"),
MAKE_INVALID_UTF8_ENTRY ("\xf4\xf4\xf4"),
MAKE_VALID_UTF8_ENTRY ("絵文字"),
MAKE_VALID_UTF8_ENTRY (" 🚀"),
};
#undef MAKE_INVALID_UTF8_ENTRY
#undef MAKE_VALID_UTF8_ENTRY
#undef MAKE_ENTRY
/* Set up structures */
GString *utf8 = g_string_sized_new (100);
for (size_t i = 0; i < G_N_ELEMENTS (strings); i++)
g_string_append (utf8, strings[i].utf8);
/* Could use UTF-16 string literals beginning with C23 */
for (size_t i = 0; i < G_N_ELEMENTS (strings); i++)
{
if (strings[i].utf8_is_valid)
{
strings[i].utf16 = g_utf8_to_utf16 (strings[i].utf8, -1, NULL,
&strings[i].utf16_length, NULL);
}
}
/* Actual test */
{
gunichar2 buffer[500];
gunichar2 *utf16;
size_t utf16_length = 0;
const gunichar2 *iter = buffer;
g_utf8_to_utf16_make_valid (utf8->str,
buffer, G_N_ELEMENTS (buffer),
&utf16, &utf16_length);
/* The result fits in the passed staging buffer */
g_assert_true (utf16 == buffer);
for (size_t i = 0; i < G_N_ELEMENTS (strings); i++)
{
if (strings[i].utf8_is_valid)
{
size_t size = strings[i].utf16_length * sizeof (gunichar2);
g_assert_true (memcmp (iter, strings[i].utf16, size) == 0);
iter += strings[i].utf16_length;
}
else
{
g_assert_cmpint (*iter, ==, 0xFFFD);
while (*iter == 0xFFFD)
iter++;
}
}
g_assert_cmpint (*iter, ==, (gunichar2) 0);
/* Test small buffer */
g_utf8_to_utf16_make_valid (utf8->str,
buffer, 10,
&utf16, &utf16_length);
g_assert_true (utf16 != buffer);
g_assert_cmpint (buffer[utf16_length], == , (gunichar2) 0);
g_assert_cmpint (utf16[utf16_length], == , (gunichar2) 0);
g_assert_cmpmem (utf16, utf16_length, buffer, utf16_length);
g_free (utf16);
}
/* Clean up structures */
g_string_free (utf8, TRUE);
for (size_t i = 0; i < G_N_ELEMENTS (strings); i++)
{
g_free (strings[i].utf16);
}
}
static void
test_utf8_to_utf16_make_valid_backtrack (void)
{
const char *utf8 =
"a" /* 1 byte => 1 gunichar2 */
"α" /* 2 bytes => 1 gunichar2 */
"⍺" /* 3 bytes => 1 gunichar2 */
"𝐀" /* 4 bytes => 2 gunichar2 */
"\xf4\xf4"; /* invalid sequence of 2 bytes => 2 gunichar2 */
gunichar2 buffer[50];
gunichar2 *utf16;
size_t utf8_offset = 0;
size_t utf16_offset = 0;
size_t i;
g_utf8_to_utf16_make_valid (utf8, buffer, G_N_ELEMENTS (buffer), &utf16, NULL);
for (i = 0; i <= 3; i++)
{
utf8_offset = g_utf8_to_utf16_make_valid_backtrack (utf8, utf16_offset++);
g_assert_cmpint (utf8_offset, ==, i * (i + 1) / 2);
}
for (i = 0; i < 2; i++)
{
utf8_offset = g_utf8_to_utf16_make_valid_backtrack (utf8, utf16_offset++);
g_assert_cmpint (utf8_offset, ==, 6 + 4);
}
for (i = 0; i < 2; i++)
{
utf8_offset = g_utf8_to_utf16_make_valid_backtrack (utf8, utf16_offset++);
g_assert_cmpint (utf8_offset, ==, 6 + 4 + i + 1);
}
/* Passing overlong offsets is safe */
utf8_offset = g_utf8_to_utf16_make_valid_backtrack (utf8, 1000);
g_assert_cmpint (utf8_offset, ==, strlen (utf8));
/* Edge case */
g_assert_cmpint (g_utf8_to_utf16_make_valid_backtrack ("", 0), ==, 0);
/* No need to call g_free */
g_assert_true (buffer == utf16);
}
int
main (int argc,
char *argv[])
{
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/utf8/utf8-to-utf16-make-valid", test_utf8_to_utf16_make_valid);
g_test_add_func ("/utf8/utf8-to-utf16-make-valid-backtrack", test_utf8_to_utf16_make_valid_backtrack);
return g_test_run();
}
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