1 files changed, 85 insertions, 0 deletions
diff --git a/extensions/universalchardet/src/base/nsCodingStateMachine.h b/extensions/universalchardet/src/base/nsCodingStateMachine.h
new file mode 100644
index 000000000..53779959c
--- /dev/null
+++ b/extensions/universalchardet/src/base/nsCodingStateMachine.h
@@ -0,0 +1,85 @@
+/* -*- 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/. */
+#ifndef nsCodingStateMachine_h__
+#define nsCodingStateMachine_h__
+
+#include "mozilla/ArrayUtils.h"
+ 
+#include "nsPkgInt.h"
+
+typedef enum {
+   eStart = 0,
+   eError = 1,
+   eItsMe = 2 
+} nsSMState;
+
+#define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
+
+//state machine model
+typedef struct 
+{
+  nsPkgInt classTable;
+  uint32_t classFactor;
+  nsPkgInt stateTable;
+  const uint32_t* charLenTable;
+#ifdef DEBUG
+  const size_t charLenTableLength;
+#endif
+  const char* name;
+} SMModel;
+
+class nsCodingStateMachine {
+public:
+  explicit nsCodingStateMachine(const SMModel* sm) : mModel(sm) { mCurrentState = eStart; }
+  nsSMState NextState(char c){
+    //for each byte we get its class , if it is first byte, we also get byte length
+    uint32_t byteCls = GETCLASS(c);
+    if (mCurrentState == eStart)
+    { 
+      mCurrentBytePos = 0; 
+      MOZ_ASSERT(byteCls < mModel->charLenTableLength);
+      mCurrentCharLen = mModel->charLenTable[byteCls];
+    }
+    //from byte's class and stateTable, we get its next state
+    mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
+                                       mModel->stateTable);
+    mCurrentBytePos++;
+    return mCurrentState;
+  }
+  uint32_t  GetCurrentCharLen(void) {return mCurrentCharLen;}
+  void      Reset(void) {mCurrentState = eStart;}
+  const char * GetCodingStateMachine() {return mModel->name;}
+
+protected:
+  nsSMState mCurrentState;
+  uint32_t mCurrentCharLen;
+  uint32_t mCurrentBytePos;
+
+  const SMModel *mModel;
+};
+
+extern const SMModel UTF8SMModel;
+extern const SMModel Big5SMModel;
+extern const SMModel EUCJPSMModel;
+extern const SMModel EUCKRSMModel;
+extern const SMModel EUCTWSMModel;
+extern const SMModel GB18030SMModel;
+extern const SMModel SJISSMModel;
+
+
+extern const SMModel HZSMModel;
+extern const SMModel ISO2022CNSMModel;
+extern const SMModel ISO2022JPSMModel;
+extern const SMModel ISO2022KRSMModel;
+
+#undef CHAR_LEN_TABLE
+#ifdef DEBUG
+#define CHAR_LEN_TABLE(x) x, mozilla::ArrayLength(x)
+#else
+#define CHAR_LEN_TABLE(x) x
+#endif
+
+#endif /* nsCodingStateMachine_h__ */
+