1 files changed, 103 insertions, 0 deletions
diff --git a/libmscgen/mscgen_utf8.c b/libmscgen/mscgen_utf8.c
new file mode 100644
index 0000000..9614c47
--- /dev/null
+++ b/libmscgen/mscgen_utf8.c
@@ -0,0 +1,103 @@
+/***************************************************************************
+ *
+ * $Id: utf8.c 93 2009-08-24 20:57:31Z Michael.McTernan $
+ *
+ * UTF8 decode routine.
+ * Copyright (C) 2008 Michael C McTernan, Michael.McTernan.2001@cs.bris.ac.uk
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ **************************************************************************/
+
+/**************************************************************************
+ * Includes
+ **************************************************************************/
+
+#include "mscgen_utf8.h"
+
+/**************************************************************************
+ * Manfest Constants
+ **************************************************************************/
+
+/**************************************************************************
+ * Macros
+ **************************************************************************/
+
+/**************************************************************************
+ * Types
+ **************************************************************************/
+
+/**************************************************************************
+ * Local Variables
+ **************************************************************************/
+
+/**************************************************************************
+ * Local Functions
+ **************************************************************************/
+
+/** Count leading ones from the MSB.
+ */
+static unsigned int clo(char c)
+{
+    unsigned int t = 0;
+
+    while((c & (0x80 >> t)) != 0 && t < 8)
+    {
+        t++;
+    }
+
+    return t;
+}
+
+/**************************************************************************
+ * Global Functions
+ **************************************************************************/
+
+Boolean Utf8Decode(const char *s, unsigned int *r, unsigned int *bytes)
+{
+    if((*s & 0x80) == 0)
+    {
+        return FALSE;
+    }
+    else
+    {
+        unsigned int t;
+
+        /* Set default return values */
+        *bytes = clo(*s);
+        *r = 0;
+
+        /* Loop through string, checking for null termination */
+        for(t = 0; t < *bytes && s[t] != '\0'; t++)
+        {
+            /* Shift up previous bits */
+            *r <<= 6;
+
+            /* Add the required bits */
+            if(t == 0)
+            {
+                *r |= s[t] & (0xff >> (*bytes + 1));
+            }
+            else
+            {
+                *r |= s[t] & 0x3f;
+            }
+        }
+
+        /* Success if no NULL was encoutered */
+        return t == *bytes;
+    }
+}
+
+/* END OF FILE */