1 files changed, 127 insertions, 0 deletions
diff --git a/src/ext/libcharsetdetect/mozilla/extensions/universalchardet/src/base/nsSBCharSetProber.cpp b/src/ext/libcharsetdetect/mozilla/extensions/universalchardet/src/base/nsSBCharSetProber.cpp
new file mode 100644
index 0000000..7ef8004
--- /dev/null
+++ b/src/ext/libcharsetdetect/mozilla/extensions/universalchardet/src/base/nsSBCharSetProber.cpp
@@ -0,0 +1,127 @@
+/* -*- 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 Universal charset detector code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *          Shy Shalom <shooshX@gmail.com>
+ *
+ * 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 <stdio.h>
+#include "nsSBCharSetProber.h"
+
+nsProbingState nsSingleByteCharSetProber::HandleData(const char* aBuf, PRUint32 aLen)
+{
+  unsigned char order;
+
+  for (PRUint32 i = 0; i < aLen; i++)
+  {
+    // Order is in [1-64] but we want 0-63 here. 
+    order = mModel->charToOrderMap[(unsigned char)aBuf[i]] -1;
+
+    if (order < SYMBOL_CAT_ORDER)
+      mTotalChar++;
+    if (order < SAMPLE_SIZE)
+    {
+        mFreqChar++;
+
+      if (mLastOrder < SAMPLE_SIZE)
+      {
+        mTotalSeqs++;
+        if (!mReversed)
+          ++(mSeqCounters[mModel->precedenceMatrix[mLastOrder*SAMPLE_SIZE+order]]);
+        else // reverse the order of the letters in the lookup
+          ++(mSeqCounters[mModel->precedenceMatrix[order*SAMPLE_SIZE+mLastOrder]]);
+      }
+    }
+    mLastOrder = order;
+  }
+
+  if (mState == eDetecting)
+    if (mTotalSeqs > SB_ENOUGH_REL_THRESHOLD)
+    {
+      float cf = GetConfidence();
+      if (cf > POSITIVE_SHORTCUT_THRESHOLD)
+        mState = eFoundIt;
+      else if (cf < NEGATIVE_SHORTCUT_THRESHOLD)
+        mState = eNotMe;
+    }
+
+  return mState;
+}
+
+void  nsSingleByteCharSetProber::Reset(void)
+{
+  mState = eDetecting;
+  mLastOrder = 255;
+  for (PRUint32 i = 0; i < NUMBER_OF_SEQ_CAT; i++)
+    mSeqCounters[i] = 0;
+  mTotalSeqs = 0;
+  mTotalChar = 0;
+  mFreqChar = 0;
+}
+
+//#define NEGATIVE_APPROACH 1
+
+float nsSingleByteCharSetProber::GetConfidence(void)
+{
+#ifdef NEGATIVE_APPROACH
+  if (mTotalSeqs > 0)
+    if (mTotalSeqs > mSeqCounters[NEGATIVE_CAT]*10 )
+      return ((float)(mTotalSeqs - mSeqCounters[NEGATIVE_CAT]*10))/mTotalSeqs * mFreqChar / mTotalChar;
+  return (float)0.01;
+#else  //POSITIVE_APPROACH
+  float r;
+
+  if (mTotalSeqs > 0) {
+    r = ((float)1.0) * mSeqCounters[POSITIVE_CAT] / mTotalSeqs / mModel->mTypicalPositiveRatio;
+    r = r*mFreqChar/mTotalChar;
+    if (r >= (float)1.00)
+      r = (float)0.99;
+    return r;
+  }
+  return (float)0.01;
+#endif
+}
+
+const char* nsSingleByteCharSetProber::GetCharSetName() 
+{
+  if (!mNameProber)
+    return mModel->charsetName;
+  return mNameProber->GetCharSetName();
+}
+
+#ifdef DEBUG_chardet
+void nsSingleByteCharSetProber::DumpStatus()
+{
+  printf("  SBCS: %1.3f [%s] [%s]\r\n", GetConfidence(), mModel->langName, GetCharSetName());
+}
+#endif