1 files changed, 96 insertions, 0 deletions
diff --git a/src/ext/libcharsetdetect/mozilla/extensions/universalchardet/src/base/nsUTF8Prober.cpp b/src/ext/libcharsetdetect/mozilla/extensions/universalchardet/src/base/nsUTF8Prober.cpp
new file mode 100644
index 0000000..7f134a9
--- /dev/null
+++ b/src/ext/libcharsetdetect/mozilla/extensions/universalchardet/src/base/nsUTF8Prober.cpp
@@ -0,0 +1,96 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsUTF8Prober.h"
+
+void  nsUTF8Prober::Reset(void)
+{
+  mCodingSM->Reset(); 
+  mNumOfMBChar = 0;
+  mState = eDetecting;
+}
+
+nsProbingState nsUTF8Prober::HandleData(const char* aBuf, PRUint32 aLen)
+{
+  nsSMState codingState;
+
+  if (mState == eNotMe)
+    return eNotMe;
+
+  for (PRUint32 i = 0; i < aLen; i++)
+  {
+    codingState = mCodingSM->NextState(aBuf[i]);
+    if (codingState == eItsMe)
+    {
+      mState = eFoundIt;
+      break;
+    }
+    if (codingState == eStart)
+    {
+      if (mCodingSM->GetCurrentCharLen() >= 2)
+        mNumOfMBChar++;
+    }
+    else if (codingState == eError)
+    {
+      return mState = eNotMe;
+    }
+  }
+
+  if (mState == eDetecting)
+    if (GetConfidence() > SHORTCUT_THRESHOLD)
+      mState = eFoundIt;
+  return mState;
+}
+
+#define ONE_CHAR_PROB   (float)0.50
+
+float nsUTF8Prober::GetConfidence(void)
+{
+  if (mState == eNotMe)
+    return 0.001;
+  float unlike = (float)0.99;
+
+  if (mNumOfMBChar < 6)
+  {
+    for (PRUint32 i = 0; i < mNumOfMBChar; i++)
+      unlike *= ONE_CHAR_PROB;
+    return (float)1.0 - unlike;
+  }
+  else
+    return (float)0.99;
+}
+