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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /extensions/universalchardet/src/base/nsEUCJPProber.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'extensions/universalchardet/src/base/nsEUCJPProber.cpp')
-rw-r--r--extensions/universalchardet/src/base/nsEUCJPProber.cpp69
1 files changed, 69 insertions, 0 deletions
diff --git a/extensions/universalchardet/src/base/nsEUCJPProber.cpp b/extensions/universalchardet/src/base/nsEUCJPProber.cpp
new file mode 100644
index 000000000..663421f03
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+++ b/extensions/universalchardet/src/base/nsEUCJPProber.cpp
@@ -0,0 +1,69 @@
+/* -*- 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/. */
+
+// for japanese encoding, obeserve characteristic:
+// 1, kana character (or hankaku?) often have hight frequency of appereance
+// 2, kana character often exist in group
+// 3, certain combination of kana is never used in japanese language
+
+#include "nsEUCJPProber.h"
+#include "nsDebug.h"
+
+void nsEUCJPProber::Reset(void)
+{
+ mCodingSM->Reset();
+ mState = eDetecting;
+ mContextAnalyser.Reset();
+ mDistributionAnalyser.Reset();
+}
+
+nsProbingState nsEUCJPProber::HandleData(const char* aBuf, uint32_t aLen)
+{
+ NS_ASSERTION(aLen, "HandleData called with empty buffer");
+ nsSMState codingState;
+
+ for (uint32_t i = 0; i < aLen; i++)
+ {
+ codingState = mCodingSM->NextState(aBuf[i]);
+ if (codingState == eItsMe)
+ {
+ mState = eFoundIt;
+ break;
+ }
+ if (codingState == eStart)
+ {
+ uint32_t charLen = mCodingSM->GetCurrentCharLen();
+
+ if (i == 0)
+ {
+ mLastChar[1] = aBuf[0];
+ mContextAnalyser.HandleOneChar(mLastChar, charLen);
+ mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
+ }
+ else
+ {
+ mContextAnalyser.HandleOneChar(aBuf+i-1, charLen);
+ mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
+ }
+ }
+ }
+
+ mLastChar[0] = aBuf[aLen-1];
+
+ if (mState == eDetecting)
+ if (mContextAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
+ mState = eFoundIt;
+
+ return mState;
+}
+
+float nsEUCJPProber::GetConfidence(void)
+{
+ float contxtCf = mContextAnalyser.GetConfidence();
+ float distribCf = mDistributionAnalyser.GetConfidence();
+
+ return (contxtCf > distribCf ? contxtCf : distribCf);
+}
+