diff options
Diffstat (limited to 'core/fpdfapi/font/cpdf_tounicodemap.cpp')
| -rw-r--r-- | core/fpdfapi/font/cpdf_tounicodemap.cpp | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/core/fpdfapi/font/cpdf_tounicodemap.cpp b/core/fpdfapi/font/cpdf_tounicodemap.cpp new file mode 100644 index 0000000000..8989f0be37 --- /dev/null +++ b/core/fpdfapi/font/cpdf_tounicodemap.cpp @@ -0,0 +1,233 @@ +// Copyright 2017 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_tounicodemap.h" + +#include "core/fpdfapi/cpdf_modulemgr.h" +#include "core/fpdfapi/font/cpdf_cid2unicodemap.h" +#include "core/fpdfapi/page/cpdf_pagemodule.h" +#include "core/fpdfapi/parser/cpdf_simple_parser.h" +#include "core/fxcrt/fx_extension.h" +#include "core/fxcrt/fx_safe_types.h" +#include "third_party/base/numerics/safe_conversions.h" + +CFX_WideString CPDF_ToUnicodeMap::Lookup(uint32_t charcode) const { + auto it = m_Map.find(charcode); + if (it != m_Map.end()) { + uint32_t value = it->second; + wchar_t unicode = (wchar_t)(value & 0xffff); + if (unicode != 0xffff) { + return unicode; + } + const wchar_t* buf = m_MultiCharBuf.GetBuffer(); + uint32_t buf_len = m_MultiCharBuf.GetLength(); + if (!buf || buf_len == 0) { + return CFX_WideString(); + } + uint32_t index = value >> 16; + if (index >= buf_len) { + return CFX_WideString(); + } + uint32_t len = buf[index]; + if (index + len < index || index + len >= buf_len) { + return CFX_WideString(); + } + return CFX_WideString(buf + index + 1, len); + } + if (m_pBaseMap) { + return m_pBaseMap->UnicodeFromCID((uint16_t)charcode); + } + return CFX_WideString(); +} + +uint32_t CPDF_ToUnicodeMap::ReverseLookup(wchar_t unicode) const { + for (const auto& pair : m_Map) { + if (pair.second == static_cast<uint32_t>(unicode)) + return pair.first; + } + return 0; +} + +// Static. +uint32_t CPDF_ToUnicodeMap::StringToCode(const CFX_ByteStringC& str) { + int len = str.GetLength(); + if (len == 0) + return 0; + + uint32_t result = 0; + if (str[0] == '<') { + for (int i = 1; i < len && std::isxdigit(str[i]); ++i) + result = result * 16 + FXSYS_HexCharToInt(str.CharAt(i)); + return result; + } + + for (int i = 0; i < len && std::isdigit(str[i]); ++i) + result = result * 10 + FXSYS_DecimalCharToInt(str.CharAt(i)); + + return result; +} + +static CFX_WideString StringDataAdd(CFX_WideString str) { + CFX_WideString ret; + int len = str.GetLength(); + wchar_t value = 1; + for (int i = len - 1; i >= 0; --i) { + wchar_t ch = str[i] + value; + if (ch < str[i]) { + ret.Insert(0, 0); + } else { + ret.Insert(0, ch); + value = 0; + } + } + if (value) { + ret.Insert(0, value); + } + return ret; +} + +// Static. +CFX_WideString CPDF_ToUnicodeMap::StringToWideString( + const CFX_ByteStringC& str) { + int len = str.GetLength(); + if (len == 0) + return CFX_WideString(); + + CFX_WideString result; + if (str[0] == '<') { + int byte_pos = 0; + wchar_t ch = 0; + for (int i = 1; i < len && std::isxdigit(str[i]); ++i) { + ch = ch * 16 + FXSYS_HexCharToInt(str[i]); + byte_pos++; + if (byte_pos == 4) { + result += ch; + byte_pos = 0; + ch = 0; + } + } + return result; + } + return result; +} + +CPDF_ToUnicodeMap::CPDF_ToUnicodeMap() : m_pBaseMap(nullptr) {} + +CPDF_ToUnicodeMap::~CPDF_ToUnicodeMap() {} + +uint32_t CPDF_ToUnicodeMap::GetUnicode() { + FX_SAFE_UINT32 uni = m_MultiCharBuf.GetLength(); + uni = uni * 0x10000 + 0xffff; + return uni.ValueOrDefault(0); +} + +void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) { + CIDSet cid_set = CIDSET_UNKNOWN; + auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream); + pAcc->LoadAllData(false); + CPDF_SimpleParser parser(pAcc->GetData(), pAcc->GetSize()); + while (1) { + CFX_ByteStringC word = parser.GetWord(); + if (word.IsEmpty()) { + break; + } + if (word == "beginbfchar") { + while (1) { + word = parser.GetWord(); + if (word.IsEmpty() || word == "endbfchar") { + break; + } + uint32_t srccode = StringToCode(word); + word = parser.GetWord(); + CFX_WideString destcode = StringToWideString(word); + int len = destcode.GetLength(); + if (len == 0) { + continue; + } + if (len == 1) { + m_Map[srccode] = destcode.GetAt(0); + } else { + m_Map[srccode] = GetUnicode(); + m_MultiCharBuf.AppendChar(destcode.GetLength()); + m_MultiCharBuf << destcode; + } + } + } else if (word == "beginbfrange") { + while (1) { + CFX_ByteString low, high; + low = parser.GetWord(); + if (low.IsEmpty() || low == "endbfrange") { + break; + } + high = parser.GetWord(); + uint32_t lowcode = StringToCode(low.AsStringC()); + uint32_t highcode = + (lowcode & 0xffffff00) | (StringToCode(high.AsStringC()) & 0xff); + if (highcode == (uint32_t)-1) { + break; + } + CFX_ByteString start(parser.GetWord()); + if (start == "[") { + for (uint32_t code = lowcode; code <= highcode; code++) { + CFX_ByteString dest(parser.GetWord()); + CFX_WideString destcode = StringToWideString(dest.AsStringC()); + int len = destcode.GetLength(); + if (len == 0) { + continue; + } + if (len == 1) { + m_Map[code] = destcode.GetAt(0); + } else { + m_Map[code] = GetUnicode(); + m_MultiCharBuf.AppendChar(destcode.GetLength()); + m_MultiCharBuf << destcode; + } + } + parser.GetWord(); + } else { + CFX_WideString destcode = StringToWideString(start.AsStringC()); + int len = destcode.GetLength(); + uint32_t value = 0; + if (len == 1) { + value = StringToCode(start.AsStringC()); + for (uint32_t code = lowcode; code <= highcode; code++) { + m_Map[code] = value++; + } + } else { + for (uint32_t code = lowcode; code <= highcode; code++) { + CFX_WideString retcode; + if (code == lowcode) { + retcode = destcode; + } else { + retcode = StringDataAdd(destcode); + } + m_Map[code] = GetUnicode(); + m_MultiCharBuf.AppendChar(retcode.GetLength()); + m_MultiCharBuf << retcode; + destcode = retcode; + } + } + } + } + } else if (word == "/Adobe-Korea1-UCS2") { + cid_set = CIDSET_KOREA1; + } else if (word == "/Adobe-Japan1-UCS2") { + cid_set = CIDSET_JAPAN1; + } else if (word == "/Adobe-CNS1-UCS2") { + cid_set = CIDSET_CNS1; + } else if (word == "/Adobe-GB1-UCS2") { + cid_set = CIDSET_GB1; + } + } + if (cid_set) { + m_pBaseMap = CPDF_ModuleMgr::Get() + ->GetPageModule() + ->GetFontGlobals() + ->m_CMapManager.GetCID2UnicodeMap(cid_set, false); + } else { + m_pBaseMap = nullptr; + } +} |