Move core/src/ up to core/.

core/src/fxcodec/jbig2/JBig2_ArithDecoder.cpp

-// 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
-
-#include "core/src/fxcodec/jbig2/JBig2_ArithDecoder.h"
-
-#include "core/include/fxcrt/fx_basic.h"
-#include "core/src/fxcodec/jbig2/JBig2_BitStream.h"
-
-namespace {
-
-struct JBig2ArithQe {
-  unsigned int Qe;
-  unsigned int NMPS;
-  unsigned int NLPS;
-  unsigned int nSwitch;
-};
-
-const JBig2ArithQe kQeTable[] = {
-    // Stupid hack to keep clang-format from reformatting this badly.
-    {0x5601, 1, 1, 1},
-    {0x3401, 2, 6, 0},
-    {0x1801, 3, 9, 0},
-    {0x0AC1, 4, 12, 0},
-    {0x0521, 5, 29, 0},
-    {0x0221, 38, 33, 0},
-    {0x5601, 7, 6, 1},
-    {0x5401, 8, 14, 0},
-    {0x4801, 9, 14, 0},
-    {0x3801, 10, 14, 0},
-    {0x3001, 11, 17, 0},
-    {0x2401, 12, 18, 0},
-    {0x1C01, 13, 20, 0},
-    {0x1601, 29, 21, 0},
-    {0x5601, 15, 14, 1},
-    {0x5401, 16, 14, 0},
-    {0x5101, 17, 15, 0},
-    {0x4801, 18, 16, 0},
-    {0x3801, 19, 17, 0},
-    {0x3401, 20, 18, 0},
-    {0x3001, 21, 19, 0},
-    {0x2801, 22, 19, 0},
-    {0x2401, 23, 20, 0},
-    {0x2201, 24, 21, 0},
-    {0x1C01, 25, 22, 0},
-    {0x1801, 26, 23, 0},
-    {0x1601, 27, 24, 0},
-    {0x1401, 28, 25, 0},
-    {0x1201, 29, 26, 0},
-    {0x1101, 30, 27, 0},
-    {0x0AC1, 31, 28, 0},
-    {0x09C1, 32, 29, 0},
-    {0x08A1, 33, 30, 0},
-    {0x0521, 34, 31, 0},
-    {0x0441, 35, 32, 0},
-    {0x02A1, 36, 33, 0},
-    {0x0221, 37, 34, 0},
-    {0x0141, 38, 35, 0},
-    {0x0111, 39, 36, 0},
-    {0x0085, 40, 37, 0},
-    {0x0049, 41, 38, 0},
-    {0x0025, 42, 39, 0},
-    {0x0015, 43, 40, 0},
-    {0x0009, 44, 41, 0},
-    {0x0005, 45, 42, 0},
-    {0x0001, 45, 43, 0},
-    {0x5601, 46, 46, 0}};
-
-const unsigned int kDefaultAValue = 0x8000;
-
-int DecodeNMPS(JBig2ArithCtx* pCX, const JBig2ArithQe& qe) {
-  pCX->I = qe.NMPS;
-  return pCX->MPS;
-}
-
-int DecodeNLPS(JBig2ArithCtx* pCX, const JBig2ArithQe& qe) {
-  // TODO(thestig): |D|, |MPS| and friends probably should be booleans.
-  int D = 1 - pCX->MPS;
-  if (qe.nSwitch == 1)
-    pCX->MPS = 1 - pCX->MPS;
-  pCX->I = qe.NLPS;
-  return D;
-}
-
-}  // namespace
-
-CJBig2_ArithDecoder::CJBig2_ArithDecoder(CJBig2_BitStream* pStream)
-    : m_pStream(pStream) {
-  m_B = m_pStream->getCurByte_arith();
-  m_C = (m_B ^ 0xff) << 16;
-  BYTEIN();
-  m_C = m_C << 7;
-  m_CT = m_CT - 7;
-  m_A = kDefaultAValue;
-}
-
-CJBig2_ArithDecoder::~CJBig2_ArithDecoder() {
-}
-
-int CJBig2_ArithDecoder::DECODE(JBig2ArithCtx* pCX) {
-  if (!pCX || pCX->I >= FX_ArraySize(kQeTable))
-    return 0;
-
-  const JBig2ArithQe& qe = kQeTable[pCX->I];
-  m_A -= qe.Qe;
-  if ((m_C >> 16) < m_A) {
-    if (m_A & kDefaultAValue)
-      return pCX->MPS;
-
-    const int D = m_A < qe.Qe ? DecodeNLPS(pCX, qe) : DecodeNMPS(pCX, qe);
-    ReadValueA();
-    return D;
-  }
-
-  m_C -= m_A << 16;
-  const int D = m_A < qe.Qe ? DecodeNMPS(pCX, qe) : DecodeNLPS(pCX, qe);
-  m_A = qe.Qe;
-  ReadValueA();
-  return D;
-}
-
-void CJBig2_ArithDecoder::BYTEIN() {
-  unsigned char B1;
-  if (m_B == 0xff) {
-    B1 = m_pStream->getNextByte_arith();
-    if (B1 > 0x8f) {
-      m_CT = 8;
-    } else {
-      m_pStream->incByteIdx();
-      m_B = B1;
-      m_C = m_C + 0xfe00 - (m_B << 9);
-      m_CT = 7;
-    }
-  } else {
-    m_pStream->incByteIdx();
-    m_B = m_pStream->getCurByte_arith();
-    m_C = m_C + 0xff00 - (m_B << 8);
-    m_CT = 8;
-  }
-}
-
-void CJBig2_ArithDecoder::ReadValueA() {
-  do {
-    if (m_CT == 0)
-      BYTEIN();
-    m_A <<= 1;
-    m_C <<= 1;
-    --m_CT;
-  } while ((m_A & kDefaultAValue) == 0);
-}