1 files changed, 53 insertions, 0 deletions
diff --git a/src/lib-charset/charset-utf8.h b/src/lib-charset/charset-utf8.h
new file mode 100644
index 0000000..c17ab30
--- /dev/null
+++ b/src/lib-charset/charset-utf8.h
@@ -0,0 +1,53 @@
+#ifndef CHARSET_UTF8_H
+#define CHARSET_UTF8_H
+
+#include "unichar.h"
+
+/* Max number of bytes that iconv can require for a single character.
+   UTF-8 takes max 6 bytes per character. Not sure about others, but I'd think
+   10 is more than enough for everyone.. */
+#define CHARSET_MAX_PENDING_BUF_SIZE 10
+
+struct charset_translation;
+
+enum charset_result {
+	CHARSET_RET_OK = 1,
+	CHARSET_RET_INCOMPLETE_INPUT = -1,
+	CHARSET_RET_INVALID_INPUT = -2
+};
+
+/* Begin translation to UTF-8. Returns -1 if charset is unknown. */
+int charset_to_utf8_begin(const char *charset, normalizer_func_t *normalizer,
+			  struct charset_translation **t_r)
+	ATTR_NULL(2);
+/* Translate UTF-8 to UTF-8 while validating the input. */
+struct charset_translation *
+charset_utf8_to_utf8_begin(normalizer_func_t *normalizer);
+void charset_to_utf8_end(struct charset_translation **t);
+void charset_to_utf8_reset(struct charset_translation *t);
+
+/* Returns TRUE if charset is UTF-8 or ASCII */
+bool charset_is_utf8(const char *charset) ATTR_PURE;
+
+/* Translate src to UTF-8. src_size is updated to contain the number of
+   characters actually translated from src. The src_size should never shrink
+   more than CHARSET_MAX_PENDING_BUF_SIZE bytes.
+
+   If src contains invalid input, UNICODE_REPLACEMENT_CHAR is placed in such
+   positions and the invalid input is skipped over. Return value is also
+   CHARSET_RET_INCOMPLETE_INPUT in that case. */
+enum charset_result
+charset_to_utf8(struct charset_translation *t,
+		const unsigned char *src, size_t *src_size, buffer_t *dest);
+
+/* Translate a single string to UTF8. */
+int charset_to_utf8_str(const char *charset, normalizer_func_t *normalizer,
+			const char *input, string_t *output,
+			enum charset_result *result_r) ATTR_NULL(2);
+
+/* INTERNAL: */
+enum charset_result
+charset_utf8_to_utf8(normalizer_func_t *normalizer,
+		     const unsigned char *src, size_t *src_size, buffer_t *dest);
+
+#endif