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1 // Copyright 2016 PDFium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | |
6 | |
7 #include "core/fpdfapi/fpdf_parser/cpdf_simple_parser.h" | |
8 | |
9 #include "core/fpdfapi/fpdf_parser/fpdf_parser_utility.h" | |
10 | |
11 CPDF_SimpleParser::CPDF_SimpleParser(const uint8_t* pData, uint32_t dwSize) | |
12 : m_pData(pData), m_dwSize(dwSize), m_dwCurPos(0) {} | |
13 | |
14 CPDF_SimpleParser::CPDF_SimpleParser(const CFX_ByteStringC& str) | |
15 : m_pData(str.raw_str()), m_dwSize(str.GetLength()), m_dwCurPos(0) {} | |
16 | |
17 void CPDF_SimpleParser::ParseWord(const uint8_t*& pStart, uint32_t& dwSize) { | |
18 pStart = nullptr; | |
19 dwSize = 0; | |
20 uint8_t ch; | |
21 while (1) { | |
22 if (m_dwSize <= m_dwCurPos) | |
23 return; | |
24 ch = m_pData[m_dwCurPos++]; | |
25 while (PDFCharIsWhitespace(ch)) { | |
26 if (m_dwSize <= m_dwCurPos) | |
27 return; | |
28 ch = m_pData[m_dwCurPos++]; | |
29 } | |
30 | |
31 if (ch != '%') | |
32 break; | |
33 | |
34 while (1) { | |
35 if (m_dwSize <= m_dwCurPos) | |
36 return; | |
37 ch = m_pData[m_dwCurPos++]; | |
38 if (PDFCharIsLineEnding(ch)) | |
39 break; | |
40 } | |
41 } | |
42 | |
43 uint32_t start_pos = m_dwCurPos - 1; | |
44 pStart = m_pData + start_pos; | |
45 if (PDFCharIsDelimiter(ch)) { | |
46 if (ch == '/') { | |
47 while (1) { | |
48 if (m_dwSize <= m_dwCurPos) | |
49 return; | |
50 ch = m_pData[m_dwCurPos++]; | |
51 if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) { | |
52 m_dwCurPos--; | |
53 dwSize = m_dwCurPos - start_pos; | |
54 return; | |
55 } | |
56 } | |
57 } else { | |
58 dwSize = 1; | |
59 if (ch == '<') { | |
60 if (m_dwSize <= m_dwCurPos) | |
61 return; | |
62 ch = m_pData[m_dwCurPos++]; | |
63 if (ch == '<') | |
64 dwSize = 2; | |
65 else | |
66 m_dwCurPos--; | |
67 } else if (ch == '>') { | |
68 if (m_dwSize <= m_dwCurPos) | |
69 return; | |
70 ch = m_pData[m_dwCurPos++]; | |
71 if (ch == '>') | |
72 dwSize = 2; | |
73 else | |
74 m_dwCurPos--; | |
75 } | |
76 } | |
77 return; | |
78 } | |
79 | |
80 dwSize = 1; | |
81 while (1) { | |
82 if (m_dwSize <= m_dwCurPos) | |
83 return; | |
84 ch = m_pData[m_dwCurPos++]; | |
85 | |
86 if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) { | |
87 m_dwCurPos--; | |
88 break; | |
89 } | |
90 dwSize++; | |
91 } | |
92 } | |
93 | |
94 CFX_ByteStringC CPDF_SimpleParser::GetWord() { | |
95 const uint8_t* pStart; | |
96 uint32_t dwSize; | |
97 ParseWord(pStart, dwSize); | |
98 if (dwSize == 1 && pStart[0] == '<') { | |
99 while (m_dwCurPos < m_dwSize && m_pData[m_dwCurPos] != '>') { | |
100 m_dwCurPos++; | |
101 } | |
102 if (m_dwCurPos < m_dwSize) { | |
103 m_dwCurPos++; | |
104 } | |
105 return CFX_ByteStringC(pStart, | |
106 (FX_STRSIZE)(m_dwCurPos - (pStart - m_pData))); | |
107 } | |
108 if (dwSize == 1 && pStart[0] == '(') { | |
109 int level = 1; | |
110 while (m_dwCurPos < m_dwSize) { | |
111 if (m_pData[m_dwCurPos] == ')') { | |
112 level--; | |
113 if (level == 0) { | |
114 break; | |
115 } | |
116 } | |
117 if (m_pData[m_dwCurPos] == '\\') { | |
118 if (m_dwSize <= m_dwCurPos) { | |
119 break; | |
120 } | |
121 m_dwCurPos++; | |
122 } else if (m_pData[m_dwCurPos] == '(') { | |
123 level++; | |
124 } | |
125 if (m_dwSize <= m_dwCurPos) { | |
126 break; | |
127 } | |
128 m_dwCurPos++; | |
129 } | |
130 if (m_dwCurPos < m_dwSize) { | |
131 m_dwCurPos++; | |
132 } | |
133 return CFX_ByteStringC(pStart, | |
134 (FX_STRSIZE)(m_dwCurPos - (pStart - m_pData))); | |
135 } | |
136 return CFX_ByteStringC(pStart, dwSize); | |
137 } | |
138 | |
139 bool CPDF_SimpleParser::FindTagParamFromStart(const CFX_ByteStringC& token, | |
140 int nParams) { | |
141 nParams++; | |
142 uint32_t* pBuf = FX_Alloc(uint32_t, nParams); | |
143 int buf_index = 0; | |
144 int buf_count = 0; | |
145 m_dwCurPos = 0; | |
146 while (1) { | |
147 pBuf[buf_index++] = m_dwCurPos; | |
148 if (buf_index == nParams) { | |
149 buf_index = 0; | |
150 } | |
151 buf_count++; | |
152 if (buf_count > nParams) { | |
153 buf_count = nParams; | |
154 } | |
155 CFX_ByteStringC word = GetWord(); | |
156 if (word.IsEmpty()) { | |
157 FX_Free(pBuf); | |
158 return false; | |
159 } | |
160 if (word == token) { | |
161 if (buf_count < nParams) { | |
162 continue; | |
163 } | |
164 m_dwCurPos = pBuf[buf_index]; | |
165 FX_Free(pBuf); | |
166 return true; | |
167 } | |
168 } | |
169 return false; | |
170 } | |
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