1 files changed, 54 insertions, 0 deletions
diff --git a/xps/xpsutf.c b/xps/xpsutf.c
new file mode 100644
index 000000000..fa972942a
--- /dev/null
+++ b/xps/xpsutf.c
@@ -0,0 +1,54 @@
+#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; 
+}
+