The Tor Browser / file comparison
comparison: extensions/universalchardet/src/base/CharDistribution.cpp
extensions/universalchardet/src/base/CharDistribution.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:a807117c3856 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; 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 #include "CharDistribution.h" | |
| 7 | |
| 8 #include "JISFreq.tab" | |
| 9 #include "Big5Freq.tab" | |
| 10 #include "EUCKRFreq.tab" | |
| 11 #include "EUCTWFreq.tab" | |
| 12 #include "GB2312Freq.tab" | |
| 13 #include "mozilla/ArrayUtils.h" | |
| 14 | |
| 15 #define SURE_YES 0.99f | |
| 16 #define SURE_NO 0.01f | |
| 17 | |
| 18 //return confidence base on received data | |
| 19 float CharDistributionAnalysis::GetConfidence(void) | |
| 20 { | |
| 21 //if we didn't receive any character in our consideration range, or the | |
| 22 // number of frequent characters is below the minimum threshold, return | |
| 23 // negative answer | |
| 24 if (mTotalChars <= 0 || mFreqChars <= mDataThreshold) | |
| 25 return SURE_NO; | |
| 26 | |
| 27 if (mTotalChars != mFreqChars) { | |
| 28 float r = mFreqChars / ((mTotalChars - mFreqChars) * mTypicalDistributionRatio); | |
| 29 | |
| 30 if (r < SURE_YES) | |
| 31 return r; | |
| 32 } | |
| 33 //normalize confidence, (we don't want to be 100% sure) | |
| 34 return SURE_YES; | |
| 35 } | |
| 36 | |
| 37 EUCTWDistributionAnalysis::EUCTWDistributionAnalysis() | |
| 38 { | |
| 39 mCharToFreqOrder = EUCTWCharToFreqOrder; | |
| 40 mTableSize = mozilla::ArrayLength(EUCTWCharToFreqOrder); | |
| 41 mTypicalDistributionRatio = EUCTW_TYPICAL_DISTRIBUTION_RATIO; | |
| 42 } | |
| 43 | |
| 44 EUCKRDistributionAnalysis::EUCKRDistributionAnalysis() | |
| 45 { | |
| 46 mCharToFreqOrder = EUCKRCharToFreqOrder; | |
| 47 mTableSize = mozilla::ArrayLength(EUCKRCharToFreqOrder); | |
| 48 mTypicalDistributionRatio = EUCKR_TYPICAL_DISTRIBUTION_RATIO; | |
| 49 } | |
| 50 | |
| 51 GB2312DistributionAnalysis::GB2312DistributionAnalysis() | |
| 52 { | |
| 53 mCharToFreqOrder = GB2312CharToFreqOrder; | |
| 54 mTableSize = mozilla::ArrayLength(GB2312CharToFreqOrder); | |
| 55 mTypicalDistributionRatio = GB2312_TYPICAL_DISTRIBUTION_RATIO; | |
| 56 } | |
| 57 | |
| 58 Big5DistributionAnalysis::Big5DistributionAnalysis() | |
| 59 { | |
| 60 mCharToFreqOrder = Big5CharToFreqOrder; | |
| 61 mTableSize = mozilla::ArrayLength(Big5CharToFreqOrder); | |
| 62 mTypicalDistributionRatio = BIG5_TYPICAL_DISTRIBUTION_RATIO; | |
| 63 } | |
| 64 | |
| 65 SJISDistributionAnalysis::SJISDistributionAnalysis() | |
| 66 { | |
| 67 mCharToFreqOrder = JISCharToFreqOrder; | |
| 68 mTableSize = mozilla::ArrayLength(JISCharToFreqOrder); | |
| 69 mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO; | |
| 70 } | |
| 71 | |
| 72 EUCJPDistributionAnalysis::EUCJPDistributionAnalysis() | |
| 73 { | |
| 74 mCharToFreqOrder = JISCharToFreqOrder; | |
| 75 mTableSize = mozilla::ArrayLength(JISCharToFreqOrder); | |
| 76 mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO; | |
| 77 } | |
| 78 |
