1 files changed, 51 insertions, 0 deletions
diff --git a/src/lib-charset/charset-utf8-only.c b/src/lib-charset/charset-utf8-only.c
new file mode 100644
index 0000000..e8ea810
--- /dev/null
+++ b/src/lib-charset/charset-utf8-only.c
@@ -0,0 +1,51 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "charset-utf8-private.h"
+
+struct charset_translation {
+	normalizer_func_t *normalizer;
+};
+
+static int
+utf8only_charset_to_utf8_begin(const char *charset,
+			       normalizer_func_t *normalizer,
+			       struct charset_translation **t_r)
+{
+	struct charset_translation *t;
+
+	if (!charset_is_utf8(charset)) {
+		/* no support for charsets that need translation */
+		return -1;
+	}
+
+	t = i_new(struct charset_translation, 1);
+	t->normalizer = normalizer;
+	*t_r = t;
+	return 0;
+}
+
+static void utf8only_charset_to_utf8_end(struct charset_translation *t)
+{
+	i_free(t);
+}
+
+static void
+utf8only_charset_to_utf8_reset(struct charset_translation *t ATTR_UNUSED)
+{
+}
+
+static enum charset_result
+utf8only_charset_to_utf8(struct charset_translation *t,
+			 const unsigned char *src, size_t *src_size,
+			 buffer_t *dest)
+{
+	return charset_utf8_to_utf8(t->normalizer, src, src_size, dest);
+}
+
+const struct charset_utf8_vfuncs charset_utf8only = {
+	.to_utf8_begin = utf8only_charset_to_utf8_begin,
+	.to_utf8_end = utf8only_charset_to_utf8_end,
+	.to_utf8_reset = utf8only_charset_to_utf8_reset,
+	.to_utf8 = utf8only_charset_to_utf8,
+};