1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
// 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 CORE_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
#define CORE_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
#include <list>
#include <memory>
#include <utility>
#include <vector>
#include "core/fpdfapi/parser/cpdf_object.h"
#include "core/fxcodec/fx_codec_def.h"
#include "core/fxcodec/jbig2/JBig2_Page.h"
#include "core/fxcodec/jbig2/JBig2_Segment.h"
#include "core/fxcrt/fx_safe_types.h"
class CJBig2_ArithDecoder;
class CJBig2_GRDProc;
class CPDF_StreamAcc;
class PauseIndicatorIface;
// Cache is keyed by the ObjNum of a stream and an index within the stream.
using CJBig2_CacheKey = std::pair<uint32_t, uint32_t>;
using CJBig2_CachePair =
std::pair<CJBig2_CacheKey, std::unique_ptr<CJBig2_SymbolDict>>;
#define JBIG2_MIN_SEGMENT_SIZE 11
enum class JBig2_Result { kSuccess, kFailure, kEndReached };
class CJBig2_Context {
public:
CJBig2_Context(const RetainPtr<CPDF_StreamAcc>& pGlobalStream,
const RetainPtr<CPDF_StreamAcc>& pSrcStream,
std::list<CJBig2_CachePair>* pSymbolDictCache,
bool bIsGlobal);
~CJBig2_Context();
static bool HuffmanAssignCode(JBig2HuffmanCode* SBSYMCODES, uint32_t NTEMP);
bool GetFirstPage(uint8_t* pBuf,
int32_t width,
int32_t height,
int32_t stride,
PauseIndicatorIface* pPause);
bool Continue(PauseIndicatorIface* pPause);
FXCODEC_STATUS GetProcessingStatus() const { return m_ProcessingStatus; }
private:
JBig2_Result DecodeSequential(PauseIndicatorIface* pPause);
JBig2_Result DecodeRandomFirstPage(PauseIndicatorIface* pPause);
JBig2_Result DecodeRandom(PauseIndicatorIface* pPause);
CJBig2_Segment* FindSegmentByNumber(uint32_t dwNumber);
CJBig2_Segment* FindReferredTableSegmentByIndex(CJBig2_Segment* pSegment,
int32_t nIndex);
JBig2_Result ParseSegmentHeader(CJBig2_Segment* pSegment);
JBig2_Result ParseSegmentData(CJBig2_Segment* pSegment,
PauseIndicatorIface* pPause);
JBig2_Result ProcessingParseSegmentData(CJBig2_Segment* pSegment,
PauseIndicatorIface* pPause);
JBig2_Result ParseSymbolDict(CJBig2_Segment* pSegment);
JBig2_Result ParseTextRegion(CJBig2_Segment* pSegment);
JBig2_Result ParsePatternDict(CJBig2_Segment* pSegment,
PauseIndicatorIface* pPause);
JBig2_Result ParseHalftoneRegion(CJBig2_Segment* pSegment,
PauseIndicatorIface* pPause);
JBig2_Result ParseGenericRegion(CJBig2_Segment* pSegment,
PauseIndicatorIface* pPause);
JBig2_Result ParseGenericRefinementRegion(CJBig2_Segment* pSegment);
JBig2_Result ParseTable(CJBig2_Segment* pSegment);
JBig2_Result ParseRegionInfo(JBig2RegionInfo* pRI);
std::vector<JBig2HuffmanCode> DecodeSymbolIDHuffmanTable(uint32_t SBNUMSYMS);
const CJBig2_HuffmanTable* GetHuffmanTable(size_t idx);
std::unique_ptr<CJBig2_Context> m_pGlobalContext;
std::unique_ptr<CJBig2_BitStream> m_pStream;
std::vector<std::unique_ptr<CJBig2_Segment>> m_SegmentList;
std::vector<std::unique_ptr<JBig2PageInfo>> m_PageInfoList;
std::unique_ptr<CJBig2_Image> m_pPage;
std::vector<std::unique_ptr<CJBig2_HuffmanTable>> m_HuffmanTables;
size_t m_nSegmentDecoded;
bool m_bInPage;
bool m_bBufSpecified;
int32_t m_PauseStep;
FXCODEC_STATUS m_ProcessingStatus;
std::vector<JBig2ArithCtx> m_gbContext;
std::unique_ptr<CJBig2_ArithDecoder> m_pArithDecoder;
std::unique_ptr<CJBig2_GRDProc> m_pGRD;
std::unique_ptr<CJBig2_Segment> m_pSegment;
FX_SAFE_UINT32 m_dwOffset;
JBig2RegionInfo m_ri;
std::list<CJBig2_CachePair>* const m_pSymbolDictCache;
bool m_bIsGlobal;
};
#endif // CORE_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
|
