diff options
Diffstat (limited to 'core/src/fxcodec/jbig2/JBig2_ArithDecoder.cpp')
-rw-r--r-- | core/src/fxcodec/jbig2/JBig2_ArithDecoder.cpp | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/core/src/fxcodec/jbig2/JBig2_ArithDecoder.cpp b/core/src/fxcodec/jbig2/JBig2_ArithDecoder.cpp deleted file mode 100644 index 9e32304f41..0000000000 --- a/core/src/fxcodec/jbig2/JBig2_ArithDecoder.cpp +++ /dev/null @@ -1,152 +0,0 @@ -// 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); -} |