--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/cext/charencode.h	Sun May 21 14:23:22 2017 +0900
@@ -0,0 +1,57 @@
+/*
+ charencode.h - miscellaneous character encoding
+
+ This software may be used and distributed according to the terms of
+ the GNU General Public License, incorporated herein by reference.
+*/
+
+#ifndef _HG_CHARENCODE_H_
+#define _HG_CHARENCODE_H_
+
+#include <Python.h>
+#include "compat.h"
+
+/* This should be kept in sync with normcasespecs in encoding.py. */
+enum normcase_spec {
+	NORMCASE_LOWER = -1,
+	NORMCASE_UPPER = 1,
+	NORMCASE_OTHER = 0
+};
+
+PyObject *unhexlify(const char *str, int len);
+PyObject *asciilower(PyObject *self, PyObject *args);
+PyObject *asciiupper(PyObject *self, PyObject *args);
+PyObject *make_file_foldmap(PyObject *self, PyObject *args);
+
+static const int8_t hextable[256] = {
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1, -1, -1, -1, -1, /* 0-9 */
+	-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* A-F */
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* a-f */
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
+};
+
+static inline int hexdigit(const char *p, Py_ssize_t off)
+{
+	int8_t val = hextable[(unsigned char)p[off]];
+
+	if (val >= 0) {
+		return val;
+	}
+
+	PyErr_SetString(PyExc_ValueError, "input contains non-hex character");
+	return 0;
+}
+
+#endif /* _HG_CHARENCODE_H_ */