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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
// Copyright 2016 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_FPDFAPI_PAGE_CPDF_PSENGINE_H_
#define CORE_FPDFAPI_PAGE_CPDF_PSENGINE_H_
#include <memory>
#include <vector>
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/fx_system.h"
class CPDF_PSEngine;
class CPDF_PSProc;
class CPDF_SimpleParser;
enum PDF_PSOP : uint8_t {
PSOP_ADD,
PSOP_SUB,
PSOP_MUL,
PSOP_DIV,
PSOP_IDIV,
PSOP_MOD,
PSOP_NEG,
PSOP_ABS,
PSOP_CEILING,
PSOP_FLOOR,
PSOP_ROUND,
PSOP_TRUNCATE,
PSOP_SQRT,
PSOP_SIN,
PSOP_COS,
PSOP_ATAN,
PSOP_EXP,
PSOP_LN,
PSOP_LOG,
PSOP_CVI,
PSOP_CVR,
PSOP_EQ,
PSOP_NE,
PSOP_GT,
PSOP_GE,
PSOP_LT,
PSOP_LE,
PSOP_AND,
PSOP_OR,
PSOP_XOR,
PSOP_NOT,
PSOP_BITSHIFT,
PSOP_TRUE,
PSOP_FALSE,
PSOP_IF,
PSOP_IFELSE,
PSOP_POP,
PSOP_EXCH,
PSOP_DUP,
PSOP_COPY,
PSOP_INDEX,
PSOP_ROLL,
PSOP_PROC,
PSOP_CONST
};
class CPDF_PSOP {
public:
CPDF_PSOP();
explicit CPDF_PSOP(PDF_PSOP op);
explicit CPDF_PSOP(float value);
~CPDF_PSOP();
float GetFloatValue() const;
CPDF_PSProc* GetProc() const;
PDF_PSOP GetOp() const { return m_op; }
private:
const PDF_PSOP m_op;
const float m_value;
std::unique_ptr<CPDF_PSProc> m_proc;
};
class CPDF_PSProc {
public:
CPDF_PSProc();
~CPDF_PSProc();
bool Parse(CPDF_SimpleParser* parser, int depth);
bool Execute(CPDF_PSEngine* pEngine);
// These methods are exposed for testing.
void AddOperatorForTesting(const ByteStringView& word);
size_t num_operators() const { return m_Operators.size(); }
const std::unique_ptr<CPDF_PSOP>& last_operator() {
return m_Operators.back();
}
private:
static const int kMaxDepth = 128;
void AddOperator(const ByteStringView& word);
std::vector<std::unique_ptr<CPDF_PSOP>> m_Operators;
};
class CPDF_PSEngine {
public:
CPDF_PSEngine();
~CPDF_PSEngine();
bool Parse(const char* str, int size);
bool Execute();
bool DoOperator(PDF_PSOP op);
void Reset() { m_StackCount = 0; }
void Push(float value);
float Pop();
int PopInt();
uint32_t GetStackSize() const { return m_StackCount; }
private:
static constexpr uint32_t kPSEngineStackSize = 100;
float m_Stack[kPSEngineStackSize];
uint32_t m_StackCount;
CPDF_PSProc m_MainProc;
};
#endif // CORE_FPDFAPI_PAGE_CPDF_PSENGINE_H_
|
