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1 // Copyright 2015 PDFium Authors. All rights reserved. | 1 // Copyright 2015 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_BitStream.h" | 7 #include "core/fxcodec/jbig2/JBig2_BitStream.h" |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 | 10 |
11 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h" | 11 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h" |
12 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h" | 12 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h" |
13 | 13 |
14 CJBig2_BitStream::CJBig2_BitStream(CPDF_StreamAcc* pSrcStream) | 14 CJBig2_BitStream::CJBig2_BitStream(CPDF_StreamAcc* pSrcStream) |
15 : m_pBuf(pSrcStream->GetData()), | 15 : m_pBuf(pSrcStream->GetData()), |
16 m_dwLength(pSrcStream->GetSize()), | 16 m_dwLength(pSrcStream->GetSize()), |
17 m_dwByteIdx(0), | 17 m_dwByteIdx(0), |
18 m_dwBitIdx(0), | 18 m_dwBitIdx(0), |
19 m_dwObjNum(pSrcStream->GetStream() ? pSrcStream->GetStream()->GetObjNum() | 19 m_dwObjNum(pSrcStream->GetStream() ? pSrcStream->GetStream()->GetObjNum() |
20 : 0) { | 20 : 0) { |
21 if (m_dwLength > 256 * 1024 * 1024) { | 21 if (m_dwLength > 256 * 1024 * 1024) { |
22 m_dwLength = 0; | 22 m_dwLength = 0; |
23 m_pBuf = nullptr; | 23 m_pBuf = nullptr; |
24 } | 24 } |
25 } | 25 } |
26 | 26 |
27 CJBig2_BitStream::~CJBig2_BitStream() {} | 27 CJBig2_BitStream::~CJBig2_BitStream() {} |
28 | 28 |
29 int32_t CJBig2_BitStream::readNBits(FX_DWORD dwBits, FX_DWORD* dwResult) { | 29 int32_t CJBig2_BitStream::readNBits(uint32_t dwBits, uint32_t* dwResult) { |
30 FX_DWORD dwBitPos = getBitPos(); | 30 uint32_t dwBitPos = getBitPos(); |
31 if (dwBitPos > LengthInBits()) | 31 if (dwBitPos > LengthInBits()) |
32 return -1; | 32 return -1; |
33 | 33 |
34 *dwResult = 0; | 34 *dwResult = 0; |
35 if (dwBitPos + dwBits <= LengthInBits()) | 35 if (dwBitPos + dwBits <= LengthInBits()) |
36 dwBitPos = dwBits; | 36 dwBitPos = dwBits; |
37 else | 37 else |
38 dwBitPos = LengthInBits() - dwBitPos; | 38 dwBitPos = LengthInBits() - dwBitPos; |
39 | 39 |
40 for (; dwBitPos > 0; --dwBitPos) { | 40 for (; dwBitPos > 0; --dwBitPos) { |
41 *dwResult = | 41 *dwResult = |
42 (*dwResult << 1) | ((m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01); | 42 (*dwResult << 1) | ((m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01); |
43 AdvanceBit(); | 43 AdvanceBit(); |
44 } | 44 } |
45 return 0; | 45 return 0; |
46 } | 46 } |
47 | 47 |
48 int32_t CJBig2_BitStream::readNBits(FX_DWORD dwBits, int32_t* nResult) { | 48 int32_t CJBig2_BitStream::readNBits(uint32_t dwBits, int32_t* nResult) { |
49 FX_DWORD dwBitPos = getBitPos(); | 49 uint32_t dwBitPos = getBitPos(); |
50 if (dwBitPos > LengthInBits()) | 50 if (dwBitPos > LengthInBits()) |
51 return -1; | 51 return -1; |
52 | 52 |
53 *nResult = 0; | 53 *nResult = 0; |
54 if (dwBitPos + dwBits <= LengthInBits()) | 54 if (dwBitPos + dwBits <= LengthInBits()) |
55 dwBitPos = dwBits; | 55 dwBitPos = dwBits; |
56 else | 56 else |
57 dwBitPos = LengthInBits() - dwBitPos; | 57 dwBitPos = LengthInBits() - dwBitPos; |
58 | 58 |
59 for (; dwBitPos > 0; --dwBitPos) { | 59 for (; dwBitPos > 0; --dwBitPos) { |
60 *nResult = | 60 *nResult = |
61 (*nResult << 1) | ((m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01); | 61 (*nResult << 1) | ((m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01); |
62 AdvanceBit(); | 62 AdvanceBit(); |
63 } | 63 } |
64 return 0; | 64 return 0; |
65 } | 65 } |
66 | 66 |
67 int32_t CJBig2_BitStream::read1Bit(FX_DWORD* dwResult) { | 67 int32_t CJBig2_BitStream::read1Bit(uint32_t* dwResult) { |
68 if (!IsInBound()) | 68 if (!IsInBound()) |
69 return -1; | 69 return -1; |
70 | 70 |
71 *dwResult = (m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01; | 71 *dwResult = (m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01; |
72 AdvanceBit(); | 72 AdvanceBit(); |
73 return 0; | 73 return 0; |
74 } | 74 } |
75 | 75 |
76 int32_t CJBig2_BitStream::read1Bit(FX_BOOL* bResult) { | 76 int32_t CJBig2_BitStream::read1Bit(FX_BOOL* bResult) { |
77 if (!IsInBound()) | 77 if (!IsInBound()) |
78 return -1; | 78 return -1; |
79 | 79 |
80 *bResult = (m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01; | 80 *bResult = (m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01; |
81 AdvanceBit(); | 81 AdvanceBit(); |
82 return 0; | 82 return 0; |
83 } | 83 } |
84 | 84 |
85 int32_t CJBig2_BitStream::read1Byte(uint8_t* cResult) { | 85 int32_t CJBig2_BitStream::read1Byte(uint8_t* cResult) { |
86 if (!IsInBound()) | 86 if (!IsInBound()) |
87 return -1; | 87 return -1; |
88 | 88 |
89 *cResult = m_pBuf[m_dwByteIdx]; | 89 *cResult = m_pBuf[m_dwByteIdx]; |
90 ++m_dwByteIdx; | 90 ++m_dwByteIdx; |
91 return 0; | 91 return 0; |
92 } | 92 } |
93 | 93 |
94 int32_t CJBig2_BitStream::readInteger(FX_DWORD* dwResult) { | 94 int32_t CJBig2_BitStream::readInteger(uint32_t* dwResult) { |
95 if (m_dwByteIdx + 3 >= m_dwLength) | 95 if (m_dwByteIdx + 3 >= m_dwLength) |
96 return -1; | 96 return -1; |
97 | 97 |
98 *dwResult = (m_pBuf[m_dwByteIdx] << 24) | (m_pBuf[m_dwByteIdx + 1] << 16) | | 98 *dwResult = (m_pBuf[m_dwByteIdx] << 24) | (m_pBuf[m_dwByteIdx + 1] << 16) | |
99 (m_pBuf[m_dwByteIdx + 2] << 8) | m_pBuf[m_dwByteIdx + 3]; | 99 (m_pBuf[m_dwByteIdx + 2] << 8) | m_pBuf[m_dwByteIdx + 3]; |
100 m_dwByteIdx += 4; | 100 m_dwByteIdx += 4; |
101 return 0; | 101 return 0; |
102 } | 102 } |
103 | 103 |
104 int32_t CJBig2_BitStream::readShortInteger(uint16_t* dwResult) { | 104 int32_t CJBig2_BitStream::readShortInteger(uint16_t* dwResult) { |
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127 } | 127 } |
128 | 128 |
129 uint8_t CJBig2_BitStream::getCurByte_arith() const { | 129 uint8_t CJBig2_BitStream::getCurByte_arith() const { |
130 return IsInBound() ? m_pBuf[m_dwByteIdx] : 0xFF; | 130 return IsInBound() ? m_pBuf[m_dwByteIdx] : 0xFF; |
131 } | 131 } |
132 | 132 |
133 uint8_t CJBig2_BitStream::getNextByte_arith() const { | 133 uint8_t CJBig2_BitStream::getNextByte_arith() const { |
134 return m_dwByteIdx + 1 < m_dwLength ? m_pBuf[m_dwByteIdx + 1] : 0xFF; | 134 return m_dwByteIdx + 1 < m_dwLength ? m_pBuf[m_dwByteIdx + 1] : 0xFF; |
135 } | 135 } |
136 | 136 |
137 FX_DWORD CJBig2_BitStream::getOffset() const { | 137 uint32_t CJBig2_BitStream::getOffset() const { |
138 return m_dwByteIdx; | 138 return m_dwByteIdx; |
139 } | 139 } |
140 | 140 |
141 void CJBig2_BitStream::setOffset(FX_DWORD dwOffset) { | 141 void CJBig2_BitStream::setOffset(uint32_t dwOffset) { |
142 m_dwByteIdx = std::min(dwOffset, m_dwLength); | 142 m_dwByteIdx = std::min(dwOffset, m_dwLength); |
143 } | 143 } |
144 | 144 |
145 FX_DWORD CJBig2_BitStream::getBitPos() const { | 145 uint32_t CJBig2_BitStream::getBitPos() const { |
146 return (m_dwByteIdx << 3) + m_dwBitIdx; | 146 return (m_dwByteIdx << 3) + m_dwBitIdx; |
147 } | 147 } |
148 | 148 |
149 void CJBig2_BitStream::setBitPos(FX_DWORD dwBitPos) { | 149 void CJBig2_BitStream::setBitPos(uint32_t dwBitPos) { |
150 m_dwByteIdx = dwBitPos >> 3; | 150 m_dwByteIdx = dwBitPos >> 3; |
151 m_dwBitIdx = dwBitPos & 7; | 151 m_dwBitIdx = dwBitPos & 7; |
152 } | 152 } |
153 | 153 |
154 const uint8_t* CJBig2_BitStream::getBuf() const { | 154 const uint8_t* CJBig2_BitStream::getBuf() const { |
155 return m_pBuf; | 155 return m_pBuf; |
156 } | 156 } |
157 | 157 |
158 const uint8_t* CJBig2_BitStream::getPointer() const { | 158 const uint8_t* CJBig2_BitStream::getPointer() const { |
159 return m_pBuf + m_dwByteIdx; | 159 return m_pBuf + m_dwByteIdx; |
160 } | 160 } |
161 | 161 |
162 void CJBig2_BitStream::offset(FX_DWORD dwOffset) { | 162 void CJBig2_BitStream::offset(uint32_t dwOffset) { |
163 m_dwByteIdx += dwOffset; | 163 m_dwByteIdx += dwOffset; |
164 } | 164 } |
165 | 165 |
166 FX_DWORD CJBig2_BitStream::getByteLeft() const { | 166 uint32_t CJBig2_BitStream::getByteLeft() const { |
167 return m_dwLength - m_dwByteIdx; | 167 return m_dwLength - m_dwByteIdx; |
168 } | 168 } |
169 | 169 |
170 void CJBig2_BitStream::AdvanceBit() { | 170 void CJBig2_BitStream::AdvanceBit() { |
171 if (m_dwBitIdx == 7) { | 171 if (m_dwBitIdx == 7) { |
172 ++m_dwByteIdx; | 172 ++m_dwByteIdx; |
173 m_dwBitIdx = 0; | 173 m_dwBitIdx = 0; |
174 } else { | 174 } else { |
175 ++m_dwBitIdx; | 175 ++m_dwBitIdx; |
176 } | 176 } |
177 } | 177 } |
178 | 178 |
179 bool CJBig2_BitStream::IsInBound() const { | 179 bool CJBig2_BitStream::IsInBound() const { |
180 return m_dwByteIdx < m_dwLength; | 180 return m_dwByteIdx < m_dwLength; |
181 } | 181 } |
182 | 182 |
183 FX_DWORD CJBig2_BitStream::LengthInBits() const { | 183 uint32_t CJBig2_BitStream::LengthInBits() const { |
184 return m_dwLength << 3; | 184 return m_dwLength << 3; |
185 } | 185 } |
186 | 186 |
187 FX_DWORD CJBig2_BitStream::getObjNum() const { | 187 uint32_t CJBig2_BitStream::getObjNum() const { |
188 return m_dwObjNum; | 188 return m_dwObjNum; |
189 } | 189 } |
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