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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 "core/fxcodec/jbig2/JBig2_ArithIntDecoder.h" | 7 #include "core/fxcodec/jbig2/JBig2_ArithIntDecoder.h" |
8 | 8 |
9 #include <vector> | 9 #include <vector> |
10 | 10 |
11 #include "core/fxcrt/include/fx_basic.h" | 11 #include "core/fxcrt/fx_basic.h" |
12 | 12 |
13 namespace { | 13 namespace { |
14 | 14 |
15 int ShiftOr(int val, int bitwise_or_val) { | 15 int ShiftOr(int val, int bitwise_or_val) { |
16 return (val << 1) | bitwise_or_val; | 16 return (val << 1) | bitwise_or_val; |
17 } | 17 } |
18 | 18 |
19 const struct ArithIntDecodeData { | 19 const struct ArithIntDecodeData { |
20 int nNeedBits; | 20 int nNeedBits; |
21 int nValue; | 21 int nValue; |
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83 void CJBig2_ArithIaidDecoder::decode(CJBig2_ArithDecoder* pArithDecoder, | 83 void CJBig2_ArithIaidDecoder::decode(CJBig2_ArithDecoder* pArithDecoder, |
84 uint32_t* nResult) { | 84 uint32_t* nResult) { |
85 int PREV = 1; | 85 int PREV = 1; |
86 for (unsigned char i = 0; i < SBSYMCODELEN; ++i) { | 86 for (unsigned char i = 0; i < SBSYMCODELEN; ++i) { |
87 JBig2ArithCtx* pCX = &m_IAID[PREV]; | 87 JBig2ArithCtx* pCX = &m_IAID[PREV]; |
88 int D = pArithDecoder->DECODE(pCX); | 88 int D = pArithDecoder->DECODE(pCX); |
89 PREV = ShiftOr(PREV, D); | 89 PREV = ShiftOr(PREV, D); |
90 } | 90 } |
91 *nResult = PREV - (1 << SBSYMCODELEN); | 91 *nResult = PREV - (1 << SBSYMCODELEN); |
92 } | 92 } |
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