KDECore
nsBig5Prober.cpp
Go to the documentation of this file.00001 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 00002 /* -*- C++ -*- 00003 * Copyright (C) 1998 <developer@mozilla.org> 00004 * 00005 * 00006 * Permission is hereby granted, free of charge, to any person obtaining 00007 * a copy of this software and associated documentation files (the 00008 * "Software"), to deal in the Software without restriction, including 00009 * without limitation the rights to use, copy, modify, merge, publish, 00010 * distribute, sublicense, and/or sell copies of the Software, and to 00011 * permit persons to whom the Software is furnished to do so, subject to 00012 * the following conditions: 00013 * 00014 * The above copyright notice and this permission notice shall be included 00015 * in all copies or substantial portions of the Software. 00016 * 00017 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 00018 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 00019 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 00020 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 00021 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 00022 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 00023 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 00024 */ 00025 00026 #include "nsBig5Prober.h" 00027 00028 namespace kencodingprober { 00029 void nsBig5Prober::Reset(void) 00030 { 00031 mCodingSM->Reset(); 00032 mState = eDetecting; 00033 mDistributionAnalyser.Reset(); 00034 } 00035 00036 nsProbingState nsBig5Prober::HandleData(const char* aBuf, unsigned int aLen) 00037 { 00038 nsSMState codingState; 00039 00040 for (unsigned int i = 0; i < aLen; i++) 00041 { 00042 codingState = mCodingSM->NextState(aBuf[i]); 00043 if (codingState == eError) 00044 { 00045 mState = eNotMe; 00046 break; 00047 } 00048 if (codingState == eItsMe) 00049 { 00050 mState = eFoundIt; 00051 break; 00052 } 00053 if (codingState == eStart) 00054 { 00055 unsigned int charLen = mCodingSM->GetCurrentCharLen(); 00056 00057 if (i == 0) 00058 { 00059 mLastChar[1] = aBuf[0]; 00060 mDistributionAnalyser.HandleOneChar(mLastChar, charLen); 00061 } 00062 else 00063 mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen); 00064 } 00065 } 00066 00067 mLastChar[0] = aBuf[aLen-1]; 00068 00069 if (mState == eDetecting) 00070 if (mDistributionAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD) 00071 mState = eFoundIt; 00072 00073 return mState; 00074 } 00075 00076 float nsBig5Prober::GetConfidence(void) 00077 { 00078 float distribCf = mDistributionAnalyser.GetConfidence(); 00079 00080 return (float)distribCf; 00081 } 00082 } 00083 00084