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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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Chromium Code Reviews
Issue 2392603004:
Move core/fpdfapi/fpdf_parser to core/fpdfapi/parser (Closed)
