The Tor Browser: extensions/universalchardet/src/base/nsSJISProber.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 // for S-JIS encoding, obeserve characteristic:

     7 // 1, kana character (or hankaku?) often have hight frequency of appereance

     8 // 2, kana character often exist in group

     9 // 3, certain combination of kana is never used in japanese language

    11 #include "nsSJISProber.h"

    12 #include "nsDebug.h"

    14 void  nsSJISProber::Reset(void)

    15 {

    16   mCodingSM->Reset();

    17   mState = eDetecting;

    18   mContextAnalyser.Reset(mIsPreferredLanguage);

    19   mDistributionAnalyser.Reset(mIsPreferredLanguage);

    20 }

    22 nsProbingState nsSJISProber::HandleData(const char* aBuf, uint32_t aLen)

    23 {

    24   NS_ASSERTION(aLen, "HandleData called with empty buffer");

    25   nsSMState codingState;

    27   for (uint32_t i = 0; i < aLen; i++)

    28   {

    29     codingState = mCodingSM->NextState(aBuf[i]);

    30     if (codingState == eItsMe)

    31     {

    32       mState = eFoundIt;

    33       break;

    34     }

    35     if (codingState == eStart)

    36     {

    37       uint32_t charLen = mCodingSM->GetCurrentCharLen();

    38       if (i == 0)

    39       {

    40         mLastChar[1] = aBuf[0];

    41         mContextAnalyser.HandleOneChar(mLastChar+2-charLen, charLen);

    42         mDistributionAnalyser.HandleOneChar(mLastChar, charLen);

    43       }

    44       else

    45       {

    46         mContextAnalyser.HandleOneChar(aBuf+i+1-charLen, charLen);

    47         mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);

    48       }

    49     }

    50   }

    52   mLastChar[0] = aBuf[aLen-1];

    54   if (mState == eDetecting)

    55     if (mContextAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)

    56       mState = eFoundIt;

    58   return mState;

    59 }

    61 float nsSJISProber::GetConfidence(void)

    62 {

    63   float contxtCf = mContextAnalyser.GetConfidence();

    64   float distribCf = mDistributionAnalyser.GetConfidence();

    66   return (contxtCf > distribCf ? contxtCf : distribCf);

    67 }

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