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| 1 // Copyright 2014 PDFium Authors. All rights reserved. | 1 // Copyright 2014 PDFium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| 6 | 6 |
| 7 #include "JBig2_ArithIntDecoder.h" | 7 #include "JBig2_ArithIntDecoder.h" |
| 8 | 8 |
| 9 #include "../../../include/fxcrt/fx_basic.h" | 9 #include "core/include/fxcrt/fx_basic.h" |
| 10 | 10 |
| 11 namespace { | 11 namespace { |
| 12 | 12 |
| 13 int ShiftOr(int val, int bitwise_or_val) { | 13 int ShiftOr(int val, int bitwise_or_val) { |
| 14 return (val << 1) | bitwise_or_val; | 14 return (val << 1) | bitwise_or_val; |
| 15 } | 15 } |
| 16 | 16 |
| 17 const struct ArithIntDecodeData { | 17 const struct ArithIntDecodeData { |
| 18 int nNeedBits; | 18 int nNeedBits; |
| 19 int nValue; | 19 int nValue; |
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| 88 void CJBig2_ArithIaidDecoder::decode(CJBig2_ArithDecoder* pArithDecoder, | 88 void CJBig2_ArithIaidDecoder::decode(CJBig2_ArithDecoder* pArithDecoder, |
| 89 FX_DWORD* nResult) { | 89 FX_DWORD* nResult) { |
| 90 int PREV = 1; | 90 int PREV = 1; |
| 91 for (unsigned char i = 0; i < SBSYMCODELEN; ++i) { | 91 for (unsigned char i = 0; i < SBSYMCODELEN; ++i) { |
| 92 JBig2ArithCtx* pCX = &m_IAID[PREV]; | 92 JBig2ArithCtx* pCX = &m_IAID[PREV]; |
| 93 int D = pArithDecoder->DECODE(pCX); | 93 int D = pArithDecoder->DECODE(pCX); |
| 94 PREV = ShiftOr(PREV, D); | 94 PREV = ShiftOr(PREV, D); |
| 95 } | 95 } |
| 96 *nResult = PREV - (1 << SBSYMCODELEN); | 96 *nResult = PREV - (1 << SBSYMCODELEN); |
| 97 } | 97 } |
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