1 files changed, 69 insertions, 0 deletions
diff --git a/xps/xpsutf.c b/xps/xpsutf.c
new file mode 100644
index 00000000..3e1c05c9
--- /dev/null
+++ b/xps/xpsutf.c
@@ -0,0 +1,69 @@
+/* Copyright (C) 2006-2010 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied, modified
+   or distributed except as expressly authorized under the terms of that
+   license.  Refer to licensing information at http://www.artifex.com/
+   or contact Artifex Software, Inc.,  7 Mt. Lassen  Drive - Suite A-134,
+   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
+*/
+
+/* XPS interpreter - unicode text functions */
+
+#include "ghostxps.h"
+
+/*
+ * http://tools.ietf.org/html/rfc3629
+ */
+
+int
+xps_utf8_to_ucs(int *p, const char *ss, int n)
+{
+	unsigned char *s = (unsigned char *)ss;
+
+	if (s == NULL)
+		goto bad;
+
+	if ((s[0] & 0x80) == 0)
+	{
+		*p = (s[0] & 0x7f);
+		return 1;
+	}
+
+	if ((s[0] & 0xe0) == 0xc0)
+	{
+		if (n < 2 || s[1] < 0x80)
+			goto bad;
+		*p = (s[0] & 0x1f) << 6;
+		*p |= (s[1] & 0x3f);
+		return 2;
+	}
+
+	if ((s[0] & 0xf0) == 0xe0)
+	{
+		if (n < 3 || s[1] < 0x80 || s[2] < 0x80)
+			goto bad;
+		*p = (s[0] & 0x0f) << 12;
+		*p |= (s[1] & 0x3f) << 6;
+		*p |= (s[2] & 0x3f);
+		return 3;
+	}
+
+	if ((s[0] & 0xf8) == 0xf0)
+	{
+		if (n < 4 || s[1] < 0x80 || s[2] < 0x80 || s[3] < 0x80)
+			goto bad;
+		*p = (s[0] & 0x07) << 18;
+		*p |= (s[1] & 0x3f) << 12;
+		*p |= (s[2] & 0x3f) << 6;
+		*p |= (s[3] & 0x3f);
+		return 4;
+	}
+
+bad:
+	*p = 0x80;
+	return 1;
+}