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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /extensions/universalchardet/src/base/nsMBCSGroupProber.cpp | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'extensions/universalchardet/src/base/nsMBCSGroupProber.cpp')
-rw-r--r-- | extensions/universalchardet/src/base/nsMBCSGroupProber.cpp | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/extensions/universalchardet/src/base/nsMBCSGroupProber.cpp b/extensions/universalchardet/src/base/nsMBCSGroupProber.cpp new file mode 100644 index 000000000..b47691443 --- /dev/null +++ b/extensions/universalchardet/src/base/nsMBCSGroupProber.cpp @@ -0,0 +1,177 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ +#include <stdio.h> + +#include "nsMBCSGroupProber.h" +#include "nsUniversalDetector.h" + +#if defined(DEBUG_chardet) || defined(DEBUG_jgmyers) +const char *ProberName[] = +{ + "UTF8", + "SJIS", + "EUCJP", +}; + +#endif + +nsMBCSGroupProber::nsMBCSGroupProber() +{ + mProbers[0] = new nsUTF8Prober(); + mProbers[1] = new nsSJISProber(); + mProbers[2] = new nsEUCJPProber(); + Reset(); +} + +nsMBCSGroupProber::~nsMBCSGroupProber() +{ + for (uint32_t i = 0; i < NUM_OF_PROBERS; i++) + { + delete mProbers[i]; + } +} + +const char* nsMBCSGroupProber::GetCharSetName() +{ + if (mBestGuess == -1) + { + GetConfidence(); + if (mBestGuess == -1) + mBestGuess = 0; + } + return mProbers[mBestGuess]->GetCharSetName(); +} + +void nsMBCSGroupProber::Reset(void) +{ + mActiveNum = 0; + for (uint32_t i = 0; i < NUM_OF_PROBERS; i++) + { + if (mProbers[i]) + { + mProbers[i]->Reset(); + mIsActive[i] = true; + ++mActiveNum; + } + else + mIsActive[i] = false; + } + mBestGuess = -1; + mState = eDetecting; + mKeepNext = 0; +} + +nsProbingState nsMBCSGroupProber::HandleData(const char* aBuf, uint32_t aLen) +{ + nsProbingState st; + uint32_t start = 0; + uint32_t keepNext = mKeepNext; + + //do filtering to reduce load to probers + for (uint32_t pos = 0; pos < aLen; ++pos) + { + if (aBuf[pos] & 0x80) + { + if (!keepNext) + start = pos; + keepNext = 2; + } + else if (keepNext) + { + if (--keepNext == 0) + { + for (uint32_t i = 0; i < NUM_OF_PROBERS; i++) + { + if (!mIsActive[i]) + continue; + st = mProbers[i]->HandleData(aBuf + start, pos + 1 - start); + if (st == eFoundIt) + { + mBestGuess = i; + mState = eFoundIt; + return mState; + } + } + } + } + } + + if (keepNext) { + for (uint32_t i = 0; i < NUM_OF_PROBERS; i++) + { + if (!mIsActive[i]) + continue; + st = mProbers[i]->HandleData(aBuf + start, aLen - start); + if (st == eFoundIt) + { + mBestGuess = i; + mState = eFoundIt; + return mState; + } + } + } + mKeepNext = keepNext; + + return mState; +} + +float nsMBCSGroupProber::GetConfidence(void) +{ + uint32_t i; + float bestConf = 0.0, cf; + + switch (mState) + { + case eFoundIt: + return (float)0.99; + case eNotMe: + return (float)0.01; + default: + for (i = 0; i < NUM_OF_PROBERS; i++) + { + if (!mIsActive[i]) + continue; + cf = mProbers[i]->GetConfidence(); + if (bestConf < cf) + { + bestConf = cf; + mBestGuess = i; + } + } + } + return bestConf; +} + +#ifdef DEBUG_chardet +void nsMBCSGroupProber::DumpStatus() +{ + uint32_t i; + float cf; + + GetConfidence(); + for (i = 0; i < NUM_OF_PROBERS; i++) + { + if (!mIsActive[i]) + printf(" MBCS inactive: [%s] (confidence is too low).\r\n", ProberName[i]); + else + { + cf = mProbers[i]->GetConfidence(); + printf(" MBCS %1.3f: [%s]\r\n", cf, ProberName[i]); + } + } +} +#endif + +#ifdef DEBUG_jgmyers +void nsMBCSGroupProber::GetDetectorState(nsUniversalDetector::DetectorState (&states)[nsUniversalDetector::NumDetectors], uint32_t &offset) +{ + for (uint32_t i = 0; i < NUM_OF_PROBERS; ++i) { + states[offset].name = ProberName[i]; + states[offset].isActive = mIsActive[i]; + states[offset].confidence = mIsActive[i] ? mProbers[i]->GetConfidence() : 0.0; + ++offset; + } +} +#endif /* DEBUG_jgmyers */ |