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comparison: extensions/universalchardet/src/base/nsSJISProber.cpp
extensions/universalchardet/src/base/nsSJISProber.cpp
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| 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/. */ | |
| 5 | |
| 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 | |
| 10 | |
| 11 #include "nsSJISProber.h" | |
| 12 #include "nsDebug.h" | |
| 13 | |
| 14 void nsSJISProber::Reset(void) | |
| 15 { | |
| 16 mCodingSM->Reset(); | |
| 17 mState = eDetecting; | |
| 18 mContextAnalyser.Reset(mIsPreferredLanguage); | |
| 19 mDistributionAnalyser.Reset(mIsPreferredLanguage); | |
| 20 } | |
| 21 | |
| 22 nsProbingState nsSJISProber::HandleData(const char* aBuf, uint32_t aLen) | |
| 23 { | |
| 24 NS_ASSERTION(aLen, "HandleData called with empty buffer"); | |
| 25 nsSMState codingState; | |
| 26 | |
| 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 } | |
| 51 | |
| 52 mLastChar[0] = aBuf[aLen-1]; | |
| 53 | |
| 54 if (mState == eDetecting) | |
| 55 if (mContextAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD) | |
| 56 mState = eFoundIt; | |
| 57 | |
| 58 return mState; | |
| 59 } | |
| 60 | |
| 61 float nsSJISProber::GetConfidence(void) | |
| 62 { | |
| 63 float contxtCf = mContextAnalyser.GetConfidence(); | |
| 64 float distribCf = mDistributionAnalyser.GetConfidence(); | |
| 65 | |
| 66 return (contxtCf > distribCf ? contxtCf : distribCf); | |
| 67 } | |
| 68 |
