diff options
Diffstat (limited to 'core/src/fxcodec/jbig2/JBig2_ArithDecoder.h')
| -rw-r--r-- | core/src/fxcodec/jbig2/JBig2_ArithDecoder.h | 252 |
1 files changed, 126 insertions, 126 deletions
diff --git a/core/src/fxcodec/jbig2/JBig2_ArithDecoder.h b/core/src/fxcodec/jbig2/JBig2_ArithDecoder.h index 1664257411..214688d3b2 100644 --- a/core/src/fxcodec/jbig2/JBig2_ArithDecoder.h +++ b/core/src/fxcodec/jbig2/JBig2_ArithDecoder.h @@ -1,126 +1,126 @@ -// 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"
-typedef struct {
- unsigned int MPS;
- unsigned int I;
-} JBig2ArithCtx;
-class CJBig2_ArithDecoder : public CJBig2_Object
-{
-public:
-
- 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)
-{
- 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)
-{
- 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
+// 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" +typedef struct { + unsigned int MPS; + unsigned int I; +} JBig2ArithCtx; +class CJBig2_ArithDecoder : public CJBig2_Object +{ +public: + + 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) +{ + 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) +{ + 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 |