Add g_converter_convert_bytes

Add a utility api to apply a GConverter to data in memory.

Test included.

gio/tests/converter.c

@@ -0,0 +1,68 @@
+/* GLib testing framework examples and tests
+ * Copyright (C) 2024 Red Hat, Inc.
+ * Authors: Matthias Clasen
+ *
+ * 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 <glib/glib.h>
+#include <gio/gio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+static void
+test_convert_bytes (void)
+{
+  char data[8192];
+  GBytes *bytes;
+  GConverter *converter;
+  GError *error = NULL;
+  GBytes *result;
+
+  for (gsize i = 0; i < sizeof (data); i++)
+    data[i] = g_test_rand_int_range (0, 256);
+
+  bytes = g_bytes_new_static (data, sizeof (data));
+
+  converter = G_CONVERTER (g_zlib_compressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP, 9));
+  result = g_converter_convert_bytes (converter, bytes, &error);
+  g_assert_no_error (error);
+  g_assert_nonnull (result);
+
+  g_bytes_unref (result);
+  g_object_unref (converter);
+
+  converter = G_CONVERTER (g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP));
+  result = g_converter_convert_bytes (converter, bytes, &error);
+  g_assert_nonnull (error);
+  g_error_free (error);
+  g_assert_true (result == NULL);
+
+  g_object_unref (converter);
+  g_bytes_unref (bytes);
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/converter/bytes", test_convert_bytes);
+
+  return g_test_run();
+}

gio/tests/meson.build

@@ -70,6 +70,7 @@ gio_tests = {
     # "LC_COLLATE support for collation orders other than simple codepoint order"
     'can_fail' : linux_libc == 'musl',
   },
+  'converter' : {},
   'credentials' : {},
   'data-input-stream' : {},
   'data-output-stream' : {},