kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 1 | // Copyright 2016 The PDFium Authors |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 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/page/cpdf_streamparser.h" |
| 8 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 9 | #include <ctype.h> |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 10 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 11 | #include <algorithm> |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 12 | #include <memory> |
| 13 | #include <utility> |
| 14 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 15 | #include "constants/stream_dict_common.h" |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 16 | #include "core/fpdfapi/page/cpdf_docpagedata.h" |
| 17 | #include "core/fpdfapi/parser/cpdf_array.h" |
| 18 | #include "core/fpdfapi/parser/cpdf_boolean.h" |
| 19 | #include "core/fpdfapi/parser/cpdf_dictionary.h" |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 20 | #include "core/fpdfapi/parser/cpdf_name.h" |
| 21 | #include "core/fpdfapi/parser/cpdf_null.h" |
| 22 | #include "core/fpdfapi/parser/cpdf_number.h" |
| 23 | #include "core/fpdfapi/parser/cpdf_stream.h" |
| 24 | #include "core/fpdfapi/parser/cpdf_string.h" |
| 25 | #include "core/fpdfapi/parser/fpdf_parser_decode.h" |
| 26 | #include "core/fpdfapi/parser/fpdf_parser_utility.h" |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 27 | #include "core/fxcodec/jpeg/jpegmodule.h" |
| 28 | #include "core/fxcodec/scanlinedecoder.h" |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 29 | #include "core/fxcrt/data_vector.h" |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 30 | #include "core/fxcrt/fx_extension.h" |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 31 | #include "core/fxcrt/fx_memory_wrappers.h" |
| 32 | #include "core/fxcrt/fx_safe_types.h" |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 33 | #include "core/fxcrt/span_util.h" |
| 34 | #include "core/fxge/calculate_pitch.h" |
| 35 | #include "third_party/base/check.h" |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 36 | |
| 37 | namespace { |
| 38 | |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 39 | const uint32_t kMaxNestedParsingLevel = 512; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 40 | const size_t kMaxStringLength = 32767; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 41 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 42 | const char kTrue[] = "true"; |
| 43 | const char kFalse[] = "false"; |
| 44 | const char kNull[] = "null"; |
| 45 | |
| 46 | uint32_t DecodeAllScanlines(std::unique_ptr<ScanlineDecoder> pDecoder) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 47 | if (!pDecoder) |
| 48 | return FX_INVALID_OFFSET; |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 49 | |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 50 | int ncomps = pDecoder->CountComps(); |
| 51 | int bpc = pDecoder->GetBPC(); |
| 52 | int width = pDecoder->GetWidth(); |
| 53 | int height = pDecoder->GetHeight(); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 54 | if (width <= 0 || height <= 0) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 55 | return FX_INVALID_OFFSET; |
| 56 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 57 | absl::optional<uint32_t> maybe_size = |
| 58 | fxge::CalculatePitch8(bpc, ncomps, width); |
| 59 | if (!maybe_size.has_value()) |
| 60 | return FX_INVALID_OFFSET; |
| 61 | |
| 62 | FX_SAFE_UINT32 size = maybe_size.value(); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 63 | size *= height; |
| 64 | if (size.ValueOrDefault(0) == 0) |
| 65 | return FX_INVALID_OFFSET; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 66 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 67 | for (int row = 0; row < height; ++row) { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 68 | if (pDecoder->GetScanline(row).empty()) |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 69 | break; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 70 | } |
| 71 | return pDecoder->GetSrcOffset(); |
| 72 | } |
| 73 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 74 | uint32_t DecodeInlineStream(pdfium::span<const uint8_t> src_span, |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 75 | int width, |
| 76 | int height, |
| 77 | const ByteString& decoder, |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 78 | RetainPtr<const CPDF_Dictionary> pParam, |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 79 | uint32_t orig_size) { |
| 80 | // |decoder| should not be an abbreviation. |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 81 | DCHECK(decoder != "A85"); |
| 82 | DCHECK(decoder != "AHx"); |
| 83 | DCHECK(decoder != "CCF"); |
| 84 | DCHECK(decoder != "DCT"); |
| 85 | DCHECK(decoder != "Fl"); |
| 86 | DCHECK(decoder != "LZW"); |
| 87 | DCHECK(decoder != "RL"); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 88 | |
| 89 | std::unique_ptr<uint8_t, FxFreeDeleter> ignored_result; |
| 90 | uint32_t ignored_size; |
| 91 | if (decoder == "FlateDecode") { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 92 | return FlateOrLZWDecode(false, src_span, pParam.Get(), orig_size, |
| 93 | &ignored_result, &ignored_size); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 94 | } |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 95 | if (decoder == "LZWDecode") { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 96 | return FlateOrLZWDecode(true, src_span, pParam.Get(), 0, &ignored_result, |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 97 | &ignored_size); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 98 | } |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 99 | if (decoder == "DCTDecode") { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 100 | std::unique_ptr<ScanlineDecoder> pDecoder = JpegModule::CreateDecoder( |
| 101 | src_span, width, height, 0, |
| 102 | !pParam || pParam->GetIntegerFor("ColorTransform", 1)); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 103 | return DecodeAllScanlines(std::move(pDecoder)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 104 | } |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 105 | if (decoder == "CCITTFaxDecode") { |
| 106 | std::unique_ptr<ScanlineDecoder> pDecoder = |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 107 | CreateFaxDecoder(src_span, width, height, pParam.Get()); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 108 | return DecodeAllScanlines(std::move(pDecoder)); |
| 109 | } |
| 110 | |
| 111 | if (decoder == "ASCII85Decode") |
| 112 | return A85Decode(src_span, &ignored_result, &ignored_size); |
| 113 | if (decoder == "ASCIIHexDecode") |
| 114 | return HexDecode(src_span, &ignored_result, &ignored_size); |
| 115 | if (decoder == "RunLengthDecode") |
| 116 | return RunLengthDecode(src_span, &ignored_result, &ignored_size); |
| 117 | |
| 118 | return FX_INVALID_OFFSET; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | } // namespace |
| 122 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 123 | CPDF_StreamParser::CPDF_StreamParser(pdfium::span<const uint8_t> span) |
| 124 | : m_pBuf(span) {} |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 125 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 126 | CPDF_StreamParser::CPDF_StreamParser(pdfium::span<const uint8_t> span, |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 127 | const WeakPtr<ByteStringPool>& pPool) |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 128 | : m_pPool(pPool), m_pBuf(span) {} |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 129 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 130 | CPDF_StreamParser::~CPDF_StreamParser() = default; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 131 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 132 | RetainPtr<CPDF_Stream> CPDF_StreamParser::ReadInlineStream( |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 133 | CPDF_Document* pDoc, |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 134 | RetainPtr<CPDF_Dictionary> pDict, |
| 135 | const CPDF_Object* pCSObj) { |
| 136 | if (m_Pos < m_pBuf.size() && PDFCharIsWhitespace(m_pBuf[m_Pos])) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 137 | m_Pos++; |
| 138 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 139 | if (m_Pos == m_pBuf.size()) |
| 140 | return nullptr; |
| 141 | |
| 142 | ByteString decoder; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 143 | RetainPtr<const CPDF_Dictionary> pParam; |
| 144 | RetainPtr<const CPDF_Object> pFilter = pDict->GetDirectObjectFor("Filter"); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 145 | if (pFilter) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 146 | const CPDF_Array* pArray = pFilter->AsArray(); |
| 147 | if (pArray) { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 148 | decoder = pArray->GetByteStringAt(0); |
| 149 | RetainPtr<const CPDF_Array> pParams = |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 150 | pDict->GetArrayFor(pdfium::stream::kDecodeParms); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 151 | if (pParams) |
| 152 | pParam = pParams->GetDictAt(0); |
| 153 | } else { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 154 | decoder = pFilter->GetString(); |
| 155 | pParam = pDict->GetDictFor(pdfium::stream::kDecodeParms); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 156 | } |
| 157 | } |
| 158 | uint32_t width = pDict->GetIntegerFor("Width"); |
| 159 | uint32_t height = pDict->GetIntegerFor("Height"); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 160 | uint32_t bpc = 1; |
| 161 | uint32_t nComponents = 1; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 162 | if (pCSObj) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 163 | RetainPtr<CPDF_ColorSpace> pCS = |
| 164 | CPDF_DocPageData::FromDocument(pDoc)->GetColorSpace(pCSObj, nullptr); |
| 165 | nComponents = pCS ? pCS->CountComponents() : 3; |
| 166 | bpc = pDict->GetIntegerFor("BitsPerComponent"); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 167 | } |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 168 | absl::optional<uint32_t> maybe_size = |
| 169 | fxge::CalculatePitch8(bpc, nComponents, width); |
| 170 | if (!maybe_size.has_value()) |
| 171 | return nullptr; |
| 172 | |
| 173 | FX_SAFE_UINT32 size = maybe_size.value(); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 174 | size *= height; |
| 175 | if (!size.IsValid()) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 176 | return nullptr; |
| 177 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 178 | uint32_t dwOrigSize = size.ValueOrDie(); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 179 | DataVector<uint8_t> data; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 180 | uint32_t dwStreamSize; |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 181 | if (decoder.IsEmpty()) { |
| 182 | dwOrigSize = std::min<uint32_t>(dwOrigSize, m_pBuf.size() - m_Pos); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 183 | auto src_span = m_pBuf.subspan(m_Pos, dwOrigSize); |
| 184 | data = DataVector<uint8_t>(src_span.begin(), src_span.end()); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 185 | dwStreamSize = dwOrigSize; |
| 186 | m_Pos += dwOrigSize; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 187 | } else { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 188 | dwStreamSize = DecodeInlineStream(m_pBuf.subspan(m_Pos), width, height, |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 189 | decoder, std::move(pParam), dwOrigSize); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 190 | if (!pdfium::base::IsValueInRangeForNumericType<int>(dwStreamSize)) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 191 | return nullptr; |
| 192 | |
| 193 | uint32_t dwSavePos = m_Pos; |
| 194 | m_Pos += dwStreamSize; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 195 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 196 | uint32_t dwPrevPos = m_Pos; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 197 | ElementType type = ParseNextElement(); |
| 198 | if (type == ElementType::kEndOfData) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 199 | break; |
| 200 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 201 | if (type != ElementType::kKeyword) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 202 | dwStreamSize += m_Pos - dwPrevPos; |
| 203 | continue; |
| 204 | } |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 205 | if (GetWord() == "EI") { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 206 | m_Pos = dwPrevPos; |
| 207 | break; |
| 208 | } |
| 209 | dwStreamSize += m_Pos - dwPrevPos; |
| 210 | } |
| 211 | m_Pos = dwSavePos; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 212 | auto src_span = m_pBuf.subspan(m_Pos, dwStreamSize); |
| 213 | data = DataVector<uint8_t>(src_span.begin(), src_span.end()); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 214 | m_Pos += dwStreamSize; |
| 215 | } |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 216 | pDict->SetNewFor<CPDF_Number>("Length", static_cast<int>(dwStreamSize)); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 217 | return pdfium::MakeRetain<CPDF_Stream>(std::move(data), std::move(pDict)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 218 | } |
| 219 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 220 | CPDF_StreamParser::ElementType CPDF_StreamParser::ParseNextElement() { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 221 | m_pLastObj.Reset(); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 222 | m_WordSize = 0; |
| 223 | if (!PositionIsInBounds()) |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 224 | return ElementType::kEndOfData; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 225 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 226 | uint8_t ch = m_pBuf[m_Pos++]; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 227 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 228 | while (PDFCharIsWhitespace(ch)) { |
| 229 | if (!PositionIsInBounds()) |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 230 | return ElementType::kEndOfData; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 231 | |
| 232 | ch = m_pBuf[m_Pos++]; |
| 233 | } |
| 234 | |
| 235 | if (ch != '%') |
| 236 | break; |
| 237 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 238 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 239 | if (!PositionIsInBounds()) |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 240 | return ElementType::kEndOfData; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 241 | |
| 242 | ch = m_pBuf[m_Pos++]; |
| 243 | if (PDFCharIsLineEnding(ch)) |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | if (PDFCharIsDelimiter(ch) && ch != '/') { |
| 249 | m_Pos--; |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 250 | m_pLastObj = ReadNextObject(false, false, 0); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 251 | return ElementType::kOther; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | bool bIsNumber = true; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 255 | while (true) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 256 | if (m_WordSize < kMaxWordLength) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 257 | m_WordBuffer[m_WordSize++] = ch; |
| 258 | |
| 259 | if (!PDFCharIsNumeric(ch)) |
| 260 | bIsNumber = false; |
| 261 | |
| 262 | if (!PositionIsInBounds()) |
| 263 | break; |
| 264 | |
| 265 | ch = m_pBuf[m_Pos++]; |
| 266 | |
| 267 | if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) { |
| 268 | m_Pos--; |
| 269 | break; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | m_WordBuffer[m_WordSize] = 0; |
| 274 | if (bIsNumber) |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 275 | return ElementType::kNumber; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 276 | |
| 277 | if (m_WordBuffer[0] == '/') |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 278 | return ElementType::kName; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 279 | |
| 280 | if (m_WordSize == 4) { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 281 | if (GetWord() == kTrue) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 282 | m_pLastObj = pdfium::MakeRetain<CPDF_Boolean>(true); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 283 | return ElementType::kOther; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 284 | } |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 285 | if (GetWord() == kNull) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 286 | m_pLastObj = pdfium::MakeRetain<CPDF_Null>(); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 287 | return ElementType::kOther; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 288 | } |
| 289 | } else if (m_WordSize == 5) { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 290 | if (GetWord() == kFalse) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 291 | m_pLastObj = pdfium::MakeRetain<CPDF_Boolean>(false); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 292 | return ElementType::kOther; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 293 | } |
| 294 | } |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 295 | return ElementType::kKeyword; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 296 | } |
| 297 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 298 | RetainPtr<CPDF_Object> CPDF_StreamParser::ReadNextObject( |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 299 | bool bAllowNestedArray, |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 300 | bool bInArray, |
| 301 | uint32_t dwRecursionLevel) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 302 | bool bIsNumber; |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 303 | // Must get the next word before returning to avoid infinite loops. |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 304 | GetNextWord(bIsNumber); |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 305 | if (!m_WordSize || dwRecursionLevel > kMaxNestedParsingLevel) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 306 | return nullptr; |
| 307 | |
| 308 | if (bIsNumber) { |
| 309 | m_WordBuffer[m_WordSize] = 0; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 310 | return pdfium::MakeRetain<CPDF_Number>(GetWord()); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | int first_char = m_WordBuffer[0]; |
| 314 | if (first_char == '/') { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 315 | ByteString name = PDF_NameDecode(GetWord().Substr(1)); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 316 | return pdfium::MakeRetain<CPDF_Name>(m_pPool, name); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | if (first_char == '(') { |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 320 | ByteString str = ReadString(); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 321 | return pdfium::MakeRetain<CPDF_String>(m_pPool, str, false); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | if (first_char == '<') { |
| 325 | if (m_WordSize == 1) |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 326 | return pdfium::MakeRetain<CPDF_String>(m_pPool, ReadHexString(), true); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 327 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 328 | auto pDict = pdfium::MakeRetain<CPDF_Dictionary>(m_pPool); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 329 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 330 | GetNextWord(bIsNumber); |
| 331 | if (m_WordSize == 2 && m_WordBuffer[0] == '>') |
| 332 | break; |
| 333 | |
| 334 | if (!m_WordSize || m_WordBuffer[0] != '/') |
| 335 | return nullptr; |
| 336 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 337 | ByteString key = PDF_NameDecode(GetWord().Substr(1)); |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 338 | RetainPtr<CPDF_Object> pObj = |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 339 | ReadNextObject(true, bInArray, dwRecursionLevel + 1); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 340 | if (!pObj) |
| 341 | return nullptr; |
| 342 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 343 | pDict->SetFor(key, std::move(pObj)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 344 | } |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 345 | return pDict; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | if (first_char == '[') { |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 349 | if ((!bAllowNestedArray && bInArray)) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 350 | return nullptr; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 351 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 352 | auto pArray = pdfium::MakeRetain<CPDF_Array>(); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 353 | while (true) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 354 | RetainPtr<CPDF_Object> pObj = |
Philip P. Moltmann | 33357ca | 2017-05-11 09:25:13 -0700 | [diff] [blame] | 355 | ReadNextObject(bAllowNestedArray, true, dwRecursionLevel + 1); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 356 | if (pObj) { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 357 | pArray->Append(std::move(pObj)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 358 | continue; |
| 359 | } |
| 360 | if (!m_WordSize || m_WordBuffer[0] == ']') |
| 361 | break; |
| 362 | } |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 363 | return pArray; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 364 | } |
| 365 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 366 | if (GetWord() == kFalse) |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 367 | return pdfium::MakeRetain<CPDF_Boolean>(false); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 368 | if (GetWord() == kTrue) |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 369 | return pdfium::MakeRetain<CPDF_Boolean>(true); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 370 | if (GetWord() == kNull) |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 371 | return pdfium::MakeRetain<CPDF_Null>(); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 372 | return nullptr; |
| 373 | } |
| 374 | |
| 375 | // TODO(npm): the following methods are almost identical in cpdf_syntaxparser |
| 376 | void CPDF_StreamParser::GetNextWord(bool& bIsNumber) { |
| 377 | m_WordSize = 0; |
| 378 | bIsNumber = true; |
| 379 | if (!PositionIsInBounds()) |
| 380 | return; |
| 381 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 382 | uint8_t ch = m_pBuf[m_Pos++]; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 383 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 384 | while (PDFCharIsWhitespace(ch)) { |
| 385 | if (!PositionIsInBounds()) { |
| 386 | return; |
| 387 | } |
| 388 | ch = m_pBuf[m_Pos++]; |
| 389 | } |
| 390 | |
| 391 | if (ch != '%') |
| 392 | break; |
| 393 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 394 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 395 | if (!PositionIsInBounds()) |
| 396 | return; |
| 397 | ch = m_pBuf[m_Pos++]; |
| 398 | if (PDFCharIsLineEnding(ch)) |
| 399 | break; |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | if (PDFCharIsDelimiter(ch)) { |
| 404 | bIsNumber = false; |
| 405 | m_WordBuffer[m_WordSize++] = ch; |
| 406 | if (ch == '/') { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 407 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 408 | if (!PositionIsInBounds()) |
| 409 | return; |
| 410 | ch = m_pBuf[m_Pos++]; |
| 411 | if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) { |
| 412 | m_Pos--; |
| 413 | return; |
| 414 | } |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 415 | if (m_WordSize < kMaxWordLength) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 416 | m_WordBuffer[m_WordSize++] = ch; |
| 417 | } |
| 418 | } else if (ch == '<') { |
| 419 | if (!PositionIsInBounds()) |
| 420 | return; |
| 421 | ch = m_pBuf[m_Pos++]; |
| 422 | if (ch == '<') |
| 423 | m_WordBuffer[m_WordSize++] = ch; |
| 424 | else |
| 425 | m_Pos--; |
| 426 | } else if (ch == '>') { |
| 427 | if (!PositionIsInBounds()) |
| 428 | return; |
| 429 | ch = m_pBuf[m_Pos++]; |
| 430 | if (ch == '>') |
| 431 | m_WordBuffer[m_WordSize++] = ch; |
| 432 | else |
| 433 | m_Pos--; |
| 434 | } |
| 435 | return; |
| 436 | } |
| 437 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 438 | while (true) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 439 | if (m_WordSize < kMaxWordLength) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 440 | m_WordBuffer[m_WordSize++] = ch; |
| 441 | if (!PDFCharIsNumeric(ch)) |
| 442 | bIsNumber = false; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 443 | if (!PositionIsInBounds()) |
| 444 | return; |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 445 | |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 446 | ch = m_pBuf[m_Pos++]; |
| 447 | if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) { |
| 448 | m_Pos--; |
| 449 | break; |
| 450 | } |
| 451 | } |
| 452 | } |
| 453 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 454 | ByteString CPDF_StreamParser::ReadString() { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 455 | if (!PositionIsInBounds()) |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 456 | return ByteString(); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 457 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 458 | ByteString buf; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 459 | int parlevel = 0; |
| 460 | int status = 0; |
| 461 | int iEscCode = 0; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 462 | uint8_t ch = m_pBuf[m_Pos++]; |
| 463 | while (true) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 464 | switch (status) { |
| 465 | case 0: |
| 466 | if (ch == ')') { |
| 467 | if (parlevel == 0) { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 468 | return buf.First(std::min(buf.GetLength(), kMaxStringLength)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 469 | } |
| 470 | parlevel--; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 471 | buf += ')'; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 472 | } else if (ch == '(') { |
| 473 | parlevel++; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 474 | buf += '('; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 475 | } else if (ch == '\\') { |
| 476 | status = 1; |
| 477 | } else { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 478 | buf += static_cast<char>(ch); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 479 | } |
| 480 | break; |
| 481 | case 1: |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 482 | if (FXSYS_IsOctalDigit(ch)) { |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 483 | iEscCode = FXSYS_DecimalCharToInt(static_cast<char>(ch)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 484 | status = 2; |
| 485 | break; |
| 486 | } |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 487 | if (ch == '\r') { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 488 | status = 4; |
| 489 | break; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 490 | } |
| 491 | if (ch == '\n') { |
| 492 | // Do nothing. |
| 493 | } else if (ch == 'n') { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 494 | buf += '\n'; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 495 | } else if (ch == 'r') { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 496 | buf += '\r'; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 497 | } else if (ch == 't') { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 498 | buf += '\t'; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 499 | } else if (ch == 'b') { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 500 | buf += '\b'; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 501 | } else if (ch == 'f') { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 502 | buf += '\f'; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 503 | } else { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 504 | buf += static_cast<char>(ch); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 505 | } |
| 506 | status = 0; |
| 507 | break; |
| 508 | case 2: |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 509 | if (FXSYS_IsOctalDigit(ch)) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 510 | iEscCode = |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 511 | iEscCode * 8 + FXSYS_DecimalCharToInt(static_cast<char>(ch)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 512 | status = 3; |
| 513 | } else { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 514 | buf += static_cast<char>(iEscCode); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 515 | status = 0; |
| 516 | continue; |
| 517 | } |
| 518 | break; |
| 519 | case 3: |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 520 | if (FXSYS_IsOctalDigit(ch)) { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 521 | iEscCode = |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 522 | iEscCode * 8 + FXSYS_DecimalCharToInt(static_cast<char>(ch)); |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 523 | buf += static_cast<char>(iEscCode); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 524 | status = 0; |
| 525 | } else { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 526 | buf += static_cast<char>(iEscCode); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 527 | status = 0; |
| 528 | continue; |
| 529 | } |
| 530 | break; |
| 531 | case 4: |
| 532 | status = 0; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 533 | if (ch != '\n') |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 534 | continue; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 535 | break; |
| 536 | } |
| 537 | if (!PositionIsInBounds()) |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 538 | return buf.First(std::min(buf.GetLength(), kMaxStringLength)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 539 | |
| 540 | ch = m_pBuf[m_Pos++]; |
| 541 | } |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 542 | } |
| 543 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 544 | ByteString CPDF_StreamParser::ReadHexString() { |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 545 | if (!PositionIsInBounds()) |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 546 | return ByteString(); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 547 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 548 | ByteString buf; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 549 | bool bFirst = true; |
| 550 | int code = 0; |
| 551 | while (PositionIsInBounds()) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 552 | uint8_t ch = m_pBuf[m_Pos++]; |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 553 | if (ch == '>') |
| 554 | break; |
| 555 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 556 | if (!isxdigit(ch)) |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 557 | continue; |
| 558 | |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 559 | int val = FXSYS_HexCharToInt(ch); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 560 | if (bFirst) { |
| 561 | code = val * 16; |
| 562 | } else { |
| 563 | code += val; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 564 | buf += static_cast<uint8_t>(code); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 565 | } |
| 566 | bFirst = !bFirst; |
| 567 | } |
| 568 | if (!bFirst) |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 569 | buf += static_cast<char>(code); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 570 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 571 | return buf.First(std::min<size_t>(buf.GetLength(), kMaxStringLength)); |
Philip P. Moltmann | 4d3acf4 | 2017-03-20 11:05:52 -0700 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | bool CPDF_StreamParser::PositionIsInBounds() const { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 575 | return m_Pos < m_pBuf.size(); |
| 576 | } |