diff options
Diffstat (limited to 'core/fpdfapi/font/cpdf_cmapparser.cpp')
| -rw-r--r-- | core/fpdfapi/font/cpdf_cmapparser.cpp | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/core/fpdfapi/font/cpdf_cmapparser.cpp b/core/fpdfapi/font/cpdf_cmapparser.cpp new file mode 100644 index 0000000000..0f9bca6018 --- /dev/null +++ b/core/fpdfapi/font/cpdf_cmapparser.cpp @@ -0,0 +1,204 @@ +// 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 + +#include "core/fpdfapi/font/cpdf_cmapparser.h" + +#include <vector> + +#include "core/fpdfapi/cmaps/cmap_int.h" +#include "core/fpdfapi/cpdf_modulemgr.h" +#include "core/fpdfapi/page/cpdf_pagemodule.h" +#include "core/fpdfapi/parser/cpdf_array.h" +#include "core/fpdfapi/parser/cpdf_dictionary.h" +#include "core/fpdfapi/parser/cpdf_simple_parser.h" +#include "core/fxcrt/fx_extension.h" +#include "core/fxge/fx_freetype.h" +#include "third_party/base/logging.h" +#include "third_party/base/stl_util.h" + +namespace { + +const char* const g_CharsetNames[CIDSET_NUM_SETS] = {nullptr, "GB1", "CNS1", + "Japan1", "Korea1", "UCS"}; + +CIDSet CIDSetFromSizeT(size_t index) { + if (index >= CIDSET_NUM_SETS) { + NOTREACHED(); + return CIDSET_UNKNOWN; + } + return static_cast<CIDSet>(index); +} + +CFX_ByteStringC CMap_GetString(const CFX_ByteStringC& word) { + if (word.GetLength() <= 2) + return CFX_ByteStringC(); + return CFX_ByteStringC(&word[1], word.GetLength() - 2); +} + +} // namespace + +CPDF_CMapParser::CPDF_CMapParser(CPDF_CMap* pCMap) + : m_pCMap(pCMap), m_Status(0), m_CodeSeq(0) {} + +CPDF_CMapParser::~CPDF_CMapParser() {} + +void CPDF_CMapParser::ParseWord(const CFX_ByteStringC& word) { + if (word.IsEmpty()) { + return; + } + if (word == "begincidchar") { + m_Status = 1; + m_CodeSeq = 0; + } else if (word == "begincidrange") { + m_Status = 2; + m_CodeSeq = 0; + } else if (word == "endcidrange" || word == "endcidchar") { + m_Status = 0; + } else if (word == "/WMode") { + m_Status = 6; + } else if (word == "/Registry") { + m_Status = 3; + } else if (word == "/Ordering") { + m_Status = 4; + } else if (word == "/Supplement") { + m_Status = 5; + } else if (word == "begincodespacerange") { + m_Status = 7; + m_CodeSeq = 0; + } else if (word == "usecmap") { + } else if (m_Status == 1 || m_Status == 2) { + m_CodePoints[m_CodeSeq] = CMap_GetCode(word); + m_CodeSeq++; + uint32_t StartCode, EndCode; + uint16_t StartCID; + if (m_Status == 1) { + if (m_CodeSeq < 2) { + return; + } + EndCode = StartCode = m_CodePoints[0]; + StartCID = (uint16_t)m_CodePoints[1]; + } else { + if (m_CodeSeq < 3) { + return; + } + StartCode = m_CodePoints[0]; + EndCode = m_CodePoints[1]; + StartCID = (uint16_t)m_CodePoints[2]; + } + if (EndCode < 0x10000) { + for (uint32_t code = StartCode; code <= EndCode; code++) { + m_pCMap->m_DirectCharcodeToCIDTable[code] = + static_cast<uint16_t>(StartCID + code - StartCode); + } + } else { + m_AdditionalCharcodeToCIDMappings.push_back( + {StartCode, EndCode, StartCID}); + } + m_CodeSeq = 0; + } else if (m_Status == 3) { + m_Status = 0; + } else if (m_Status == 4) { + m_pCMap->m_Charset = CharsetFromOrdering(CMap_GetString(word)); + m_Status = 0; + } else if (m_Status == 5) { + m_Status = 0; + } else if (m_Status == 6) { + m_pCMap->m_bVertical = CMap_GetCode(word) != 0; + m_Status = 0; + } else if (m_Status == 7) { + if (word == "endcodespacerange") { + uint32_t nSegs = pdfium::CollectionSize<uint32_t>(m_CodeRanges); + if (nSegs > 1) { + m_pCMap->m_CodingScheme = CPDF_CMap::MixedFourBytes; + m_pCMap->m_MixedFourByteLeadingRanges = m_CodeRanges; + } else if (nSegs == 1) { + m_pCMap->m_CodingScheme = (m_CodeRanges[0].m_CharSize == 2) + ? CPDF_CMap::TwoBytes + : CPDF_CMap::OneByte; + } + m_Status = 0; + } else { + if (word.GetLength() == 0 || word.GetAt(0) != '<') { + return; + } + if (m_CodeSeq % 2) { + CPDF_CMap::CodeRange range; + if (CMap_GetCodeRange(range, m_LastWord.AsStringC(), word)) + m_CodeRanges.push_back(range); + } + m_CodeSeq++; + } + } + m_LastWord = word; +} + +// Static. +uint32_t CPDF_CMapParser::CMap_GetCode(const CFX_ByteStringC& word) { + pdfium::base::CheckedNumeric<uint32_t> num = 0; + if (word.GetAt(0) == '<') { + for (int i = 1; i < word.GetLength() && std::isxdigit(word.GetAt(i)); ++i) { + num = num * 16 + FXSYS_HexCharToInt(word.GetAt(i)); + if (!num.IsValid()) + return 0; + } + return num.ValueOrDie(); + } + + for (int i = 0; i < word.GetLength() && std::isdigit(word.GetAt(i)); ++i) { + num = + num * 10 + FXSYS_DecimalCharToInt(static_cast<wchar_t>(word.GetAt(i))); + if (!num.IsValid()) + return 0; + } + return num.ValueOrDie(); +} + +// Static. +bool CPDF_CMapParser::CMap_GetCodeRange(CPDF_CMap::CodeRange& range, + const CFX_ByteStringC& first, + const CFX_ByteStringC& second) { + if (first.GetLength() == 0 || first.GetAt(0) != '<') + return false; + + int i; + for (i = 1; i < first.GetLength(); ++i) { + if (first.GetAt(i) == '>') { + break; + } + } + range.m_CharSize = (i - 1) / 2; + if (range.m_CharSize > 4) + return false; + + for (i = 0; i < range.m_CharSize; ++i) { + uint8_t digit1 = first.GetAt(i * 2 + 1); + uint8_t digit2 = first.GetAt(i * 2 + 2); + range.m_Lower[i] = + FXSYS_HexCharToInt(digit1) * 16 + FXSYS_HexCharToInt(digit2); + } + + uint32_t size = second.GetLength(); + for (i = 0; i < range.m_CharSize; ++i) { + uint8_t digit1 = ((uint32_t)i * 2 + 1 < size) + ? second.GetAt((FX_STRSIZE)i * 2 + 1) + : '0'; + uint8_t digit2 = ((uint32_t)i * 2 + 2 < size) + ? second.GetAt((FX_STRSIZE)i * 2 + 2) + : '0'; + range.m_Upper[i] = + FXSYS_HexCharToInt(digit1) * 16 + FXSYS_HexCharToInt(digit2); + } + return true; +} + +// static +CIDSet CPDF_CMapParser::CharsetFromOrdering(const CFX_ByteStringC& ordering) { + for (size_t charset = 1; charset < FX_ArraySize(g_CharsetNames); ++charset) { + if (ordering == g_CharsetNames[charset]) + return CIDSetFromSizeT(charset); + } + return CIDSET_UNKNOWN; +} |