Split up JBig2_GeneralDecoder.cpp.

core/src/fxcodec/jbig2/JBig2_ArithDecoder.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#ifndef _JBIG2_ARITHMETIC_DECODER_H_
-#define _JBIG2_ARITHMETIC_DECODER_H_
-#include "JBig2_Define.h"
-#include "JBig2_BitStream.h"
-#include "JBig2_ArithQe.h"
+#ifndef CORE_SRC_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_
+#define CORE_SRC_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_
+
+class CJBig2_BitStream;
 
 struct JBig2ArithCtx {
   unsigned int MPS;
   unsigned int I;
 };
 
 class CJBig2_ArithDecoder {
  public:
   explicit CJBig2_ArithDecoder(CJBig2_BitStream* pStream);
 
   ~CJBig2_ArithDecoder();
 
   int DECODE(JBig2ArithCtx* pCX);
 
  private:
   void INITDEC();
   void BYTEIN();
 
   unsigned char B;
   unsigned int C;
   unsigned int A;
   unsigned int CT;
   CJBig2_BitStream* m_pStream;
 };
 
-inline CJBig2_ArithDecoder::CJBig2_ArithDecoder(CJBig2_BitStream* pStream) {

[Lei Zhang, 2015/09/23 01:23:28]

This went into JBig2_ArithDecoder.cpp.

[Tom Sepez, 2015/09/23 23:03:34]

But performance will plummet !!! (not).

-  m_pStream = pStream;
-  INITDEC();
-}
-inline CJBig2_ArithDecoder::~CJBig2_ArithDecoder() {}
-inline void CJBig2_ArithDecoder::INITDEC() {
-  B = m_pStream->getCurByte_arith();
-  C = (B ^ 0xff) << 16;
-  ;
-  BYTEIN();
-  C = C << 7;
-  CT = CT - 7;
-  A = 0x8000;
-}
-inline void CJBig2_ArithDecoder::BYTEIN() {
-  unsigned char B1;
-  if (B == 0xff) {
-    B1 = m_pStream->getNextByte_arith();
-    if (B1 > 0x8f) {
-      CT = 8;
-    } else {
-      m_pStream->incByteIdx();
-      B = B1;
-      C = C + 0xfe00 - (B << 9);
-      CT = 7;
-    }
-  } else {
-    m_pStream->incByteIdx();
-    B = m_pStream->getCurByte_arith();
-    C = C + 0xff00 - (B << 8);
-    CT = 8;
-  }
-}
-inline int CJBig2_ArithDecoder::DECODE(JBig2ArithCtx* pCX) {
-  if (!pCX || pCX->I >= JBIG2_QE_NUM) {
-    return 0;
-  }
-
-  int D;
-  const JBig2ArithQe* qe = &QeTable[pCX->I];
-  A = A - qe->Qe;
-  if ((C >> 16) < A) {
-    if (A & 0x8000) {
-      D = pCX->MPS;
-    } else {
-      if (A < qe->Qe) {
-        D = 1 - pCX->MPS;
-        if (qe->nSwitch == 1) {
-          pCX->MPS = 1 - pCX->MPS;
-        }
-        pCX->I = qe->NLPS;
-      } else {
-        D = pCX->MPS;
-        pCX->I = qe->NMPS;
-      }
-      do {
-        if (CT == 0) {
-          BYTEIN();
-        }
-        A <<= 1;
-        C <<= 1;
-        CT--;
-      } while ((A & 0x8000) == 0);
-    }
-  } else {
-    C -= A << 16;
-    if (A < qe->Qe) {
-      A = qe->Qe;
-      D = pCX->MPS;
-      pCX->I = qe->NMPS;
-    } else {
-      A = qe->Qe;
-      D = 1 - pCX->MPS;
-      if (qe->nSwitch == 1) {
-        pCX->MPS = 1 - pCX->MPS;
-      }
-      pCX->I = qe->NLPS;
-    }
-    do {
-      if (CT == 0) {
-        BYTEIN();
-      }
-      A <<= 1;
-      C <<= 1;
-      CT--;
-    } while ((A & 0x8000) == 0);
-  }
-  return D;
-}
-#endif
+#endif  // CORE_SRC_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_