| // 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/edit/cpdf_creator.h" |
| |
| #include "core/fpdfapi/edit/cpdf_encryptor.h" |
| #include "core/fpdfapi/edit/cpdf_flateencoder.h" |
| #include "core/fpdfapi/edit/cpdf_objectstream.h" |
| #include "core/fpdfapi/edit/cpdf_xrefstream.h" |
| #include "core/fpdfapi/parser/cpdf_array.h" |
| #include "core/fpdfapi/parser/cpdf_crypto_handler.h" |
| #include "core/fpdfapi/parser/cpdf_document.h" |
| #include "core/fpdfapi/parser/cpdf_number.h" |
| #include "core/fpdfapi/parser/cpdf_parser.h" |
| #include "core/fpdfapi/parser/cpdf_security_handler.h" |
| #include "core/fpdfapi/parser/cpdf_string.h" |
| #include "core/fpdfapi/parser/fpdf_parser_decode.h" |
| #include "core/fxcrt/fx_extension.h" |
| |
| namespace { |
| |
| const uint32_t kXRefStreamMaxSize = 10000; |
| |
| std::vector<uint8_t> GenerateFileID(uint32_t dwSeed1, uint32_t dwSeed2) { |
| std::vector<uint8_t> buffer(sizeof(uint32_t) * 4); |
| uint32_t* pBuffer = reinterpret_cast<uint32_t*>(buffer.data()); |
| void* pContext = FX_Random_MT_Start(dwSeed1); |
| for (int i = 0; i < 2; ++i) |
| *pBuffer++ = FX_Random_MT_Generate(pContext); |
| |
| FX_Random_MT_Close(pContext); |
| pContext = FX_Random_MT_Start(dwSeed2); |
| for (int i = 0; i < 2; ++i) |
| *pBuffer++ = FX_Random_MT_Generate(pContext); |
| |
| FX_Random_MT_Close(pContext); |
| return buffer; |
| } |
| |
| int32_t OutputIndex(CFX_FileBufferArchive* pFile, FX_FILESIZE offset) { |
| if (pFile->AppendByte(static_cast<uint8_t>(offset >> 24)) < 0) |
| return -1; |
| if (pFile->AppendByte(static_cast<uint8_t>(offset >> 16)) < 0) |
| return -1; |
| if (pFile->AppendByte(static_cast<uint8_t>(offset >> 8)) < 0) |
| return -1; |
| if (pFile->AppendByte(static_cast<uint8_t>(offset)) < 0) |
| return -1; |
| if (pFile->AppendByte(0) < 0) |
| return -1; |
| return 0; |
| } |
| |
| } // namespace |
| |
| CPDF_Creator::CPDF_Creator(CPDF_Document* pDoc, |
| const CFX_RetainPtr<IFX_WriteStream>& pFile) |
| : m_pDocument(pDoc), |
| m_pParser(pDoc->GetParser()), |
| m_bSecurityChanged(false), |
| m_pEncryptDict(m_pParser ? m_pParser->GetEncryptDict() : nullptr), |
| m_dwEncryptObjNum(0), |
| m_pCryptoHandler(m_pParser ? m_pParser->GetCryptoHandler() : nullptr), |
| m_pMetadata(nullptr), |
| m_ObjectStreamSize(200), |
| m_dwLastObjNum(m_pDocument->GetLastObjNum()), |
| m_Offset(0), |
| m_SavedOffset(0), |
| m_iStage(-1), |
| m_dwFlags(0), |
| m_CurObjNum(0), |
| m_XrefStart(0), |
| m_pIDArray(nullptr), |
| m_FileVersion(0) { |
| m_File.AttachFile(pFile); |
| } |
| |
| CPDF_Creator::~CPDF_Creator() { |
| Clear(); |
| } |
| |
| bool CPDF_Creator::IsXRefNeedEnd() { |
| if (!IsIncremental()) |
| return false; |
| return m_pXRefStream->CountIndexArrayItems() >= kXRefStreamMaxSize; |
| } |
| |
| int32_t CPDF_Creator::WriteIndirectObjectToStream(const CPDF_Object* pObj) { |
| if (!m_pXRefStream) |
| return 1; |
| |
| uint32_t objnum = pObj->GetObjNum(); |
| if (m_pParser && m_pParser->GetObjectGenNum(objnum) > 0) |
| return 1; |
| if (pObj->IsNumber()) |
| return 1; |
| |
| CPDF_Dictionary* pDict = pObj->GetDict(); |
| if (pObj->IsStream()) { |
| if (pDict && pDict->GetStringFor("Type") == "XRef") |
| return 0; |
| return 1; |
| } |
| |
| if (pDict) { |
| if (pDict == m_pDocument->GetRoot() || pDict == m_pEncryptDict) |
| return 1; |
| if (pDict->IsSignatureDict()) |
| return 1; |
| if (pDict->GetStringFor("Type") == "Page") |
| return 1; |
| } |
| |
| m_pXRefStream->AddObjectNumberToIndexArray(objnum); |
| if (m_pXRefStream->CompressIndirectObject(objnum, pObj, this) < 0) |
| return -1; |
| if (!IsXRefNeedEnd()) |
| return 0; |
| if (!m_pXRefStream->End(this, false)) |
| return -1; |
| if (!m_pXRefStream->Start()) |
| return -1; |
| return 0; |
| } |
| int32_t CPDF_Creator::WriteIndirectObjectToStream(uint32_t objnum, |
| const uint8_t* pBuffer, |
| uint32_t dwSize) { |
| if (!m_pXRefStream) |
| return 1; |
| |
| m_pXRefStream->AddObjectNumberToIndexArray(objnum); |
| int32_t iRet = |
| m_pXRefStream->CompressIndirectObject(objnum, pBuffer, dwSize, this); |
| if (iRet < 1) |
| return iRet; |
| if (!IsXRefNeedEnd()) |
| return 0; |
| if (!m_pXRefStream->End(this, false)) |
| return -1; |
| if (!m_pXRefStream->Start()) |
| return -1; |
| return 0; |
| } |
| |
| int32_t CPDF_Creator::AppendObjectNumberToXRef(uint32_t objnum) { |
| if (!m_pXRefStream) |
| return 1; |
| |
| m_pXRefStream->AddObjectNumberToIndexArray(objnum); |
| if (!IsXRefNeedEnd()) |
| return 0; |
| if (!m_pXRefStream->End(this, false)) |
| return -1; |
| if (!m_pXRefStream->Start()) |
| return -1; |
| return 0; |
| } |
| |
| int32_t CPDF_Creator::WriteStream(const CPDF_Object* pStream, |
| uint32_t objnum, |
| CPDF_CryptoHandler* pCrypto) { |
| CPDF_FlateEncoder encoder(const_cast<CPDF_Stream*>(pStream->AsStream()), |
| pStream != m_pMetadata); |
| CPDF_Encryptor encryptor(pCrypto, objnum, encoder.GetData(), |
| encoder.GetSize()); |
| if (static_cast<uint32_t>(encoder.GetDict()->GetIntegerFor("Length")) != |
| encryptor.GetSize()) { |
| encoder.CloneDict(); |
| encoder.GetDict()->SetNewFor<CPDF_Number>( |
| "Length", static_cast<int>(encryptor.GetSize())); |
| } |
| if (WriteDirectObj(objnum, encoder.GetDict()) < 0) |
| return -1; |
| |
| int len = m_File.AppendString("stream\r\n"); |
| if (len < 0) |
| return -1; |
| |
| m_Offset += len; |
| if (m_File.AppendBlock(encryptor.GetData(), encryptor.GetSize()) < 0) |
| return -1; |
| |
| m_Offset += encryptor.GetSize(); |
| if ((len = m_File.AppendString("\r\nendstream")) < 0) |
| return -1; |
| |
| m_Offset += len; |
| return 1; |
| } |
| |
| int32_t CPDF_Creator::WriteIndirectObj(uint32_t objnum, |
| const CPDF_Object* pObj) { |
| int32_t len = m_File.AppendDWord(objnum); |
| if (len < 0) |
| return -1; |
| |
| m_Offset += len; |
| if ((len = m_File.AppendString(" 0 obj\r\n")) < 0) |
| return -1; |
| |
| m_Offset += len; |
| if (pObj->IsStream()) { |
| CPDF_CryptoHandler* pHandler = |
| pObj != m_pMetadata ? m_pCryptoHandler.Get() : nullptr; |
| if (WriteStream(pObj, objnum, pHandler) < 0) |
| return -1; |
| } else { |
| if (WriteDirectObj(objnum, pObj) < 0) |
| return -1; |
| } |
| if ((len = m_File.AppendString("\r\nendobj\r\n")) < 0) |
| return -1; |
| |
| m_Offset += len; |
| if (AppendObjectNumberToXRef(objnum) < 0) |
| return -1; |
| return 0; |
| } |
| |
| int32_t CPDF_Creator::WriteIndirectObj(const CPDF_Object* pObj) { |
| int32_t iRet = WriteIndirectObjectToStream(pObj); |
| if (iRet < 1) |
| return iRet; |
| return WriteIndirectObj(pObj->GetObjNum(), pObj); |
| } |
| |
| int32_t CPDF_Creator::WriteDirectObj(uint32_t objnum, |
| const CPDF_Object* pObj, |
| bool bEncrypt) { |
| switch (pObj->GetType()) { |
| case CPDF_Object::BOOLEAN: |
| case CPDF_Object::NAME: |
| case CPDF_Object::NULLOBJ: |
| case CPDF_Object::NUMBER: |
| case CPDF_Object::REFERENCE: |
| if (!pObj->WriteTo(&m_File, &m_Offset)) |
| return -1; |
| break; |
| |
| case CPDF_Object::STRING: { |
| CFX_ByteString str = pObj->GetString(); |
| bool bHex = pObj->AsString()->IsHex(); |
| if (!m_pCryptoHandler || !bEncrypt) { |
| if (!pObj->WriteTo(&m_File, &m_Offset)) |
| return -1; |
| break; |
| } |
| CPDF_Encryptor encryptor(m_pCryptoHandler.Get(), objnum, |
| (uint8_t*)str.c_str(), str.GetLength()); |
| CFX_ByteString content = PDF_EncodeString( |
| CFX_ByteString(encryptor.GetData(), encryptor.GetSize()), bHex); |
| int32_t len = m_File.AppendString(content.AsStringC()); |
| if (len < 0) |
| return -1; |
| |
| m_Offset += len; |
| break; |
| } |
| case CPDF_Object::STREAM: { |
| CPDF_FlateEncoder encoder(const_cast<CPDF_Stream*>(pObj->AsStream()), |
| true); |
| CPDF_Encryptor encryptor(m_pCryptoHandler.Get(), objnum, |
| encoder.GetData(), encoder.GetSize()); |
| if (static_cast<uint32_t>(encoder.GetDict()->GetIntegerFor("Length")) != |
| encryptor.GetSize()) { |
| encoder.CloneDict(); |
| encoder.GetDict()->SetNewFor<CPDF_Number>( |
| "Length", static_cast<int>(encryptor.GetSize())); |
| } |
| if (WriteDirectObj(objnum, encoder.GetDict()) < 0) |
| return -1; |
| |
| int32_t len = m_File.AppendString("stream\r\n"); |
| if (len < 0) |
| return -1; |
| |
| m_Offset += len; |
| if (m_File.AppendBlock(encryptor.GetData(), encryptor.GetSize()) < 0) |
| return -1; |
| |
| m_Offset += encryptor.GetSize(); |
| len = m_File.AppendString("\r\nendstream"); |
| if (len < 0) |
| return -1; |
| |
| m_Offset += len; |
| break; |
| } |
| case CPDF_Object::ARRAY: { |
| if (m_File.AppendString("[") < 0) |
| return -1; |
| |
| m_Offset += 1; |
| const CPDF_Array* p = pObj->AsArray(); |
| for (size_t i = 0; i < p->GetCount(); i++) { |
| CPDF_Object* pElement = p->GetObjectAt(i); |
| if (!pElement->IsInline()) { |
| if (m_File.AppendString(" ") < 0) |
| return -1; |
| |
| int32_t len = m_File.AppendDWord(pElement->GetObjNum()); |
| if (len < 0) |
| return -1; |
| if (m_File.AppendString(" 0 R") < 0) |
| return -1; |
| |
| m_Offset += len + 5; |
| } else { |
| if (WriteDirectObj(objnum, pElement) < 0) |
| return -1; |
| } |
| } |
| if (m_File.AppendString("]") < 0) |
| return -1; |
| |
| m_Offset += 1; |
| break; |
| } |
| case CPDF_Object::DICTIONARY: { |
| if (!m_pCryptoHandler || pObj == m_pEncryptDict) { |
| if (!pObj->WriteTo(&m_File, &m_Offset)) |
| return -1; |
| break; |
| } |
| |
| if (m_File.AppendString("<<") < 0) |
| return -1; |
| |
| m_Offset += 2; |
| const CPDF_Dictionary* p = pObj->AsDictionary(); |
| bool bSignDict = p->IsSignatureDict(); |
| for (const auto& it : *p) { |
| bool bSignValue = false; |
| const CFX_ByteString& key = it.first; |
| CPDF_Object* pValue = it.second.get(); |
| if (m_File.AppendString("/") < 0) |
| return -1; |
| |
| int32_t len = m_File.AppendString(PDF_NameEncode(key).AsStringC()); |
| if (len < 0) |
| return -1; |
| |
| m_Offset += len + 1; |
| if (bSignDict && key == "Contents") |
| bSignValue = true; |
| |
| if (!pValue->IsInline()) { |
| if (m_File.AppendString(" ") < 0) |
| return -1; |
| |
| len = m_File.AppendDWord(pValue->GetObjNum()); |
| if (len < 0) |
| return -1; |
| if (m_File.AppendString(" 0 R ") < 0) |
| return -1; |
| |
| m_Offset += len + 6; |
| } else { |
| if (WriteDirectObj(objnum, pValue, !bSignValue) < 0) |
| return -1; |
| } |
| } |
| if (m_File.AppendString(">>") < 0) |
| return -1; |
| |
| m_Offset += 2; |
| break; |
| } |
| } |
| return 1; |
| } |
| |
| int32_t CPDF_Creator::WriteOldIndirectObject(uint32_t objnum) { |
| if (m_pParser->IsObjectFreeOrNull(objnum)) |
| return 0; |
| |
| m_ObjectOffsets[objnum] = m_Offset; |
| bool bExistInMap = !!m_pDocument->GetIndirectObject(objnum); |
| const uint8_t object_type = m_pParser->GetObjectType(objnum); |
| bool bObjStm = (object_type == 2) && m_pEncryptDict && !m_pXRefStream; |
| if (m_pParser->IsVersionUpdated() || m_bSecurityChanged || bExistInMap || |
| bObjStm) { |
| CPDF_Object* pObj = m_pDocument->GetOrParseIndirectObject(objnum); |
| if (!pObj) { |
| m_ObjectOffsets.erase(objnum); |
| return 0; |
| } |
| if (WriteIndirectObj(pObj)) |
| return -1; |
| if (!bExistInMap) |
| m_pDocument->DeleteIndirectObject(objnum); |
| } else { |
| uint8_t* pBuffer; |
| uint32_t size; |
| m_pParser->GetIndirectBinary(objnum, pBuffer, size); |
| if (!pBuffer) |
| return 0; |
| if (object_type == 2) { |
| if (m_pXRefStream) { |
| if (WriteIndirectObjectToStream(objnum, pBuffer, size) < 0) { |
| FX_Free(pBuffer); |
| return -1; |
| } |
| } else { |
| int32_t len = m_File.AppendDWord(objnum); |
| if (len < 0) |
| return -1; |
| if (m_File.AppendString(" 0 obj ") < 0) |
| return -1; |
| |
| m_Offset += len + 7; |
| if (m_File.AppendBlock(pBuffer, size) < 0) |
| return -1; |
| |
| m_Offset += size; |
| if (m_File.AppendString("\r\nendobj\r\n") < 0) |
| return -1; |
| |
| m_Offset += 10; |
| } |
| } else { |
| if (m_File.AppendBlock(pBuffer, size) < 0) |
| return -1; |
| |
| m_Offset += size; |
| if (AppendObjectNumberToXRef(objnum) < 0) |
| return -1; |
| } |
| FX_Free(pBuffer); |
| } |
| return 1; |
| } |
| |
| int32_t CPDF_Creator::WriteOldObjs() { |
| uint32_t nLastObjNum = m_pParser->GetLastObjNum(); |
| if (!m_pParser->IsValidObjectNumber(nLastObjNum)) |
| return 0; |
| |
| for (uint32_t objnum = m_CurObjNum; objnum <= nLastObjNum; ++objnum) { |
| int32_t iRet = WriteOldIndirectObject(objnum); |
| if (iRet < 0) |
| return iRet; |
| if (!iRet) |
| continue; |
| } |
| return 0; |
| } |
| |
| int32_t CPDF_Creator::WriteNewObjs(bool bIncremental) { |
| uint32_t iCount = pdfium::CollectionSize<uint32_t>(m_NewObjNumArray); |
| uint32_t index = m_CurObjNum; |
| while (index < iCount) { |
| uint32_t objnum = m_NewObjNumArray[index]; |
| CPDF_Object* pObj = m_pDocument->GetIndirectObject(objnum); |
| if (!pObj) { |
| ++index; |
| continue; |
| } |
| m_ObjectOffsets[objnum] = m_Offset; |
| if (WriteIndirectObj(pObj)) |
| return -1; |
| |
| index++; |
| } |
| return 0; |
| } |
| |
| void CPDF_Creator::InitOldObjNumOffsets() { |
| if (!m_pParser) |
| return; |
| |
| uint32_t j = 0; |
| uint32_t dwStart = 0; |
| uint32_t dwEnd = m_pParser->GetLastObjNum(); |
| while (dwStart <= dwEnd) { |
| while (dwStart <= dwEnd && m_pParser->IsObjectFreeOrNull(dwStart)) |
| dwStart++; |
| |
| if (dwStart > dwEnd) |
| break; |
| |
| j = dwStart; |
| while (j <= dwEnd && !m_pParser->IsObjectFreeOrNull(j)) |
| j++; |
| |
| dwStart = j; |
| } |
| } |
| |
| void CPDF_Creator::InitNewObjNumOffsets() { |
| for (const auto& pair : *m_pDocument) { |
| const uint32_t objnum = pair.first; |
| const CPDF_Object* pObj = pair.second.get(); |
| if (IsIncremental() || pObj->GetObjNum() == CPDF_Object::kInvalidObjNum) |
| continue; |
| if (m_pParser && m_pParser->IsValidObjectNumber(objnum) && |
| m_pParser->GetObjectType(objnum)) { |
| continue; |
| } |
| m_NewObjNumArray.insert(std::lower_bound(m_NewObjNumArray.begin(), |
| m_NewObjNumArray.end(), objnum), |
| objnum); |
| } |
| } |
| |
| int32_t CPDF_Creator::WriteDoc_Stage1() { |
| ASSERT(m_iStage > -1 || m_iStage < 20); |
| if (m_iStage == 0) { |
| if (!m_pParser) |
| m_dwFlags &= ~FPDFCREATE_INCREMENTAL; |
| if (m_bSecurityChanged && (m_dwFlags & FPDFCREATE_NO_ORIGINAL) == 0) |
| m_dwFlags &= ~FPDFCREATE_INCREMENTAL; |
| |
| CPDF_Dictionary* pDict = m_pDocument->GetRoot(); |
| m_pMetadata = pDict ? pDict->GetDirectObjectFor("Metadata") : nullptr; |
| if (m_dwFlags & FPDFCREATE_OBJECTSTREAM) { |
| m_pXRefStream = pdfium::MakeUnique<CPDF_XRefStream>(); |
| m_pXRefStream->Start(); |
| if (IsIncremental() && m_pParser) |
| m_pXRefStream->SetPreviousOffset(m_pParser->GetLastXRefOffset()); |
| } |
| m_iStage = 10; |
| } |
| if (m_iStage == 10) { |
| if (!IsIncremental()) { |
| if (m_File.AppendString("%PDF-1.") < 0) |
| return -1; |
| |
| m_Offset += 7; |
| int32_t version = 7; |
| if (m_FileVersion) |
| version = m_FileVersion; |
| else if (m_pParser) |
| version = m_pParser->GetFileVersion(); |
| |
| int32_t len = m_File.AppendDWord(version % 10); |
| if (len < 0) |
| return -1; |
| |
| m_Offset += len; |
| if ((len = m_File.AppendString("\r\n%\xA1\xB3\xC5\xD7\r\n")) < 0) |
| return -1; |
| |
| m_Offset += len; |
| InitOldObjNumOffsets(); |
| m_iStage = 20; |
| } else { |
| CFX_RetainPtr<IFX_SeekableReadStream> pSrcFile = |
| m_pParser->GetFileAccess(); |
| m_Offset = pSrcFile->GetSize(); |
| m_SavedOffset = m_Offset; |
| m_iStage = 15; |
| } |
| } |
| if (m_iStage == 15) { |
| if ((m_dwFlags & FPDFCREATE_NO_ORIGINAL) == 0 && m_SavedOffset > 0) { |
| CFX_RetainPtr<IFX_SeekableReadStream> pSrcFile = |
| m_pParser->GetFileAccess(); |
| std::vector<uint8_t> buffer(4096); |
| FX_FILESIZE src_size = m_SavedOffset; |
| while (src_size) { |
| uint32_t block_size = src_size > 4096 ? 4096 : src_size; |
| if (!pSrcFile->ReadBlock(buffer.data(), m_Offset - src_size, |
| block_size)) { |
| return -1; |
| } |
| if (m_File.AppendBlock(buffer.data(), block_size) < 0) |
| return -1; |
| |
| src_size -= block_size; |
| } |
| } |
| if ((m_dwFlags & FPDFCREATE_NO_ORIGINAL) == 0 && |
| m_pParser->GetLastXRefOffset() == 0) { |
| InitOldObjNumOffsets(); |
| uint32_t dwEnd = m_pParser->GetLastObjNum(); |
| bool bObjStm = (m_dwFlags & FPDFCREATE_OBJECTSTREAM) != 0; |
| for (uint32_t objnum = 0; objnum <= dwEnd; objnum++) { |
| if (m_pParser->IsObjectFreeOrNull(objnum)) |
| continue; |
| |
| m_ObjectOffsets[objnum] = m_pParser->GetObjectPositionOrZero(objnum); |
| if (bObjStm) |
| m_pXRefStream->AddObjectNumberToIndexArray(objnum); |
| } |
| if (bObjStm) { |
| m_pXRefStream->EndXRefStream(this); |
| m_pXRefStream->Start(); |
| } |
| } |
| m_iStage = 20; |
| } |
| InitNewObjNumOffsets(); |
| return m_iStage; |
| } |
| |
| int32_t CPDF_Creator::WriteDoc_Stage2() { |
| ASSERT(m_iStage >= 20 || m_iStage < 30); |
| if (m_iStage == 20) { |
| if (!IsIncremental() && m_pParser) { |
| m_CurObjNum = 0; |
| m_iStage = 21; |
| } else { |
| m_iStage = 25; |
| } |
| } |
| if (m_iStage == 21) { |
| int32_t iRet = WriteOldObjs(); |
| if (iRet) |
| return iRet; |
| |
| m_iStage = 25; |
| } |
| if (m_iStage == 25) { |
| m_CurObjNum = 0; |
| m_iStage = 26; |
| } |
| if (m_iStage == 26) { |
| int32_t iRet = WriteNewObjs(IsIncremental()); |
| if (iRet) |
| return iRet; |
| |
| m_iStage = 27; |
| } |
| if (m_iStage == 27) { |
| if (m_pEncryptDict && m_pEncryptDict->IsInline()) { |
| m_dwLastObjNum += 1; |
| FX_FILESIZE saveOffset = m_Offset; |
| if (WriteIndirectObj(m_dwLastObjNum, m_pEncryptDict) < 0) |
| return -1; |
| |
| m_ObjectOffsets[m_dwLastObjNum] = saveOffset; |
| m_dwEncryptObjNum = m_dwLastObjNum; |
| if (IsIncremental()) |
| m_NewObjNumArray.push_back(m_dwLastObjNum); |
| } |
| m_iStage = 80; |
| } |
| return m_iStage; |
| } |
| |
| int32_t CPDF_Creator::WriteDoc_Stage3() { |
| ASSERT(m_iStage >= 80 || m_iStage < 90); |
| uint32_t dwLastObjNum = m_dwLastObjNum; |
| if (m_iStage == 80) { |
| m_XrefStart = m_Offset; |
| if (m_dwFlags & FPDFCREATE_OBJECTSTREAM) { |
| m_pXRefStream->End(this, true); |
| m_XrefStart = m_pXRefStream->GetPreviousOffset(); |
| m_iStage = 90; |
| } else if (!IsIncremental() || !m_pParser->IsXRefStream()) { |
| if (!IsIncremental() || m_pParser->GetLastXRefOffset() == 0) { |
| CFX_ByteString str; |
| str = pdfium::ContainsKey(m_ObjectOffsets, 1) |
| ? "xref\r\n" |
| : "xref\r\n0 1\r\n0000000000 65535 f\r\n"; |
| if (m_File.AppendString(str.AsStringC()) < 0) |
| return -1; |
| |
| m_CurObjNum = 1; |
| m_iStage = 81; |
| } else { |
| if (m_File.AppendString("xref\r\n") < 0) |
| return -1; |
| |
| m_CurObjNum = 0; |
| m_iStage = 82; |
| } |
| } else { |
| m_iStage = 90; |
| } |
| } |
| if (m_iStage == 81) { |
| CFX_ByteString str; |
| uint32_t i = m_CurObjNum; |
| uint32_t j; |
| while (i <= dwLastObjNum) { |
| while (i <= dwLastObjNum && !pdfium::ContainsKey(m_ObjectOffsets, i)) |
| i++; |
| |
| if (i > dwLastObjNum) |
| break; |
| |
| j = i; |
| while (j <= dwLastObjNum && pdfium::ContainsKey(m_ObjectOffsets, j)) |
| j++; |
| |
| if (i == 1) |
| str.Format("0 %d\r\n0000000000 65535 f\r\n", j); |
| else |
| str.Format("%d %d\r\n", i, j - i); |
| |
| if (m_File.AppendBlock(str.c_str(), str.GetLength()) < 0) |
| return -1; |
| |
| while (i < j) { |
| str.Format("%010d 00000 n\r\n", m_ObjectOffsets[i++]); |
| if (m_File.AppendBlock(str.c_str(), str.GetLength()) < 0) |
| return -1; |
| } |
| if (i > dwLastObjNum) |
| break; |
| } |
| m_iStage = 90; |
| } |
| if (m_iStage == 82) { |
| CFX_ByteString str; |
| uint32_t iCount = pdfium::CollectionSize<uint32_t>(m_NewObjNumArray); |
| uint32_t i = m_CurObjNum; |
| while (i < iCount) { |
| size_t j = i; |
| uint32_t objnum = m_NewObjNumArray[i]; |
| while (j < iCount) { |
| if (++j == iCount) |
| break; |
| uint32_t dwCurrent = m_NewObjNumArray[j]; |
| if (dwCurrent - objnum > 1) |
| break; |
| objnum = dwCurrent; |
| } |
| objnum = m_NewObjNumArray[i]; |
| if (objnum == 1) |
| str.Format("0 %d\r\n0000000000 65535 f\r\n", j - i + 1); |
| else |
| str.Format("%d %d\r\n", objnum, j - i); |
| |
| if (m_File.AppendBlock(str.c_str(), str.GetLength()) < 0) |
| return -1; |
| |
| while (i < j) { |
| objnum = m_NewObjNumArray[i++]; |
| str.Format("%010d 00000 n\r\n", m_ObjectOffsets[objnum]); |
| if (m_File.AppendBlock(str.c_str(), str.GetLength()) < 0) |
| return -1; |
| } |
| } |
| m_iStage = 90; |
| } |
| return m_iStage; |
| } |
| |
| int32_t CPDF_Creator::WriteDoc_Stage4() { |
| ASSERT(m_iStage >= 90); |
| if ((m_dwFlags & FPDFCREATE_OBJECTSTREAM) == 0) { |
| bool bXRefStream = IsIncremental() && m_pParser->IsXRefStream(); |
| if (!bXRefStream) { |
| if (m_File.AppendString("trailer\r\n<<") < 0) |
| return -1; |
| } else { |
| if (m_File.AppendDWord(m_pDocument->GetLastObjNum() + 1) < 0) |
| return -1; |
| if (m_File.AppendString(" 0 obj <<") < 0) |
| return -1; |
| } |
| |
| if (m_pParser) { |
| CPDF_Dictionary* p = m_pParser->GetTrailer(); |
| for (const auto& it : *p) { |
| const CFX_ByteString& key = it.first; |
| CPDF_Object* pValue = it.second.get(); |
| // TODO(ochang): Consolidate with similar check in |
| // CPDF_XRefStream::WriteTrailer. |
| if (key == "Encrypt" || key == "Size" || key == "Filter" || |
| key == "Index" || key == "Length" || key == "Prev" || key == "W" || |
| key == "XRefStm" || key == "ID") { |
| continue; |
| } |
| if (m_File.AppendString(("/")) < 0) |
| return -1; |
| if (m_File.AppendString(PDF_NameEncode(key).AsStringC()) < 0) |
| return -1; |
| if (!pValue->IsInline()) { |
| if (m_File.AppendString(" ") < 0) |
| return -1; |
| if (m_File.AppendDWord(pValue->GetObjNum()) < 0) |
| return -1; |
| if (m_File.AppendString(" 0 R ") < 0) |
| return -1; |
| } else { |
| FX_FILESIZE offset = 0; |
| if (!pValue->WriteTo(&m_File, &offset)) |
| return -1; |
| } |
| } |
| } else { |
| if (m_File.AppendString("\r\n/Root ") < 0) |
| return -1; |
| if (m_File.AppendDWord(m_pDocument->GetRoot()->GetObjNum()) < 0) |
| return -1; |
| if (m_File.AppendString(" 0 R\r\n") < 0) |
| return -1; |
| if (m_pDocument->GetInfo()) { |
| if (m_File.AppendString("/Info ") < 0) |
| return -1; |
| if (m_File.AppendDWord(m_pDocument->GetInfo()->GetObjNum()) < 0) |
| return -1; |
| if (m_File.AppendString(" 0 R\r\n") < 0) |
| return -1; |
| } |
| } |
| if (m_pEncryptDict) { |
| if (m_File.AppendString("/Encrypt") < 0) |
| return -1; |
| |
| uint32_t dwObjNum = m_pEncryptDict->GetObjNum(); |
| if (dwObjNum == 0) |
| dwObjNum = m_pDocument->GetLastObjNum() + 1; |
| if (m_File.AppendString(" ") < 0) |
| return -1; |
| if (m_File.AppendDWord(dwObjNum) < 0) |
| return -1; |
| if (m_File.AppendString(" 0 R ") < 0) |
| return -1; |
| } |
| |
| if (m_File.AppendString("/Size ") < 0) |
| return -1; |
| if (m_File.AppendDWord(m_dwLastObjNum + (bXRefStream ? 2 : 1)) < 0) |
| return -1; |
| if (IsIncremental()) { |
| FX_FILESIZE prev = m_pParser->GetLastXRefOffset(); |
| if (prev) { |
| if (m_File.AppendString("/Prev ") < 0) |
| return -1; |
| |
| char offset_buf[20]; |
| memset(offset_buf, 0, sizeof(offset_buf)); |
| FXSYS_i64toa(prev, offset_buf, 10); |
| if (m_File.AppendBlock(offset_buf, FXSYS_strlen(offset_buf)) < 0) |
| return -1; |
| } |
| } |
| if (m_pIDArray) { |
| if (m_File.AppendString(("/ID")) < 0) |
| return -1; |
| |
| FX_FILESIZE offset = 0; |
| if (!m_pIDArray->WriteTo(&m_File, &offset)) |
| return -1; |
| } |
| if (!bXRefStream) { |
| if (m_File.AppendString(">>") < 0) |
| return -1; |
| } else { |
| if (m_File.AppendString("/W[0 4 1]/Index[") < 0) |
| return -1; |
| if (IsIncremental() && m_pParser && m_pParser->GetLastXRefOffset() == 0) { |
| uint32_t i = 0; |
| for (i = 0; i < m_dwLastObjNum; i++) { |
| if (!pdfium::ContainsKey(m_ObjectOffsets, i)) |
| continue; |
| if (m_File.AppendDWord(i) < 0) |
| return -1; |
| if (m_File.AppendString(" 1 ") < 0) |
| return -1; |
| } |
| if (m_File.AppendString("]/Length ") < 0) |
| return -1; |
| if (m_File.AppendDWord(m_dwLastObjNum * 5) < 0) |
| return -1; |
| if (m_File.AppendString(">>stream\r\n") < 0) |
| return -1; |
| for (i = 0; i < m_dwLastObjNum; i++) { |
| auto it = m_ObjectOffsets.find(i); |
| if (it == m_ObjectOffsets.end()) |
| continue; |
| OutputIndex(&m_File, it->second); |
| } |
| } else { |
| size_t count = m_NewObjNumArray.size(); |
| size_t i = 0; |
| for (i = 0; i < count; i++) { |
| if (m_File.AppendDWord(m_NewObjNumArray[i]) < 0) |
| return -1; |
| if (m_File.AppendString(" 1 ") < 0) |
| return -1; |
| } |
| if (m_File.AppendString("]/Length ") < 0) |
| return -1; |
| if (m_File.AppendDWord(count * 5) < 0) |
| return -1; |
| if (m_File.AppendString(">>stream\r\n") < 0) |
| return -1; |
| for (i = 0; i < count; i++) |
| OutputIndex(&m_File, m_ObjectOffsets[m_NewObjNumArray[i]]); |
| } |
| if (m_File.AppendString("\r\nendstream") < 0) |
| return -1; |
| } |
| } |
| |
| if (m_File.AppendString("\r\nstartxref\r\n") < 0) |
| return -1; |
| |
| char offset_buf[20]; |
| memset(offset_buf, 0, sizeof(offset_buf)); |
| FXSYS_i64toa(m_XrefStart, offset_buf, 10); |
| if (m_File.AppendBlock(offset_buf, FXSYS_strlen(offset_buf)) < 0) |
| return -1; |
| if (m_File.AppendString("\r\n%%EOF\r\n") < 0) |
| return -1; |
| |
| m_File.Flush(); |
| return m_iStage = 100; |
| } |
| |
| void CPDF_Creator::Clear() { |
| m_pXRefStream.reset(); |
| m_File.Clear(); |
| m_NewObjNumArray.clear(); |
| m_pIDArray.reset(); |
| } |
| |
| bool CPDF_Creator::Create(uint32_t flags) { |
| m_dwFlags = flags; |
| m_iStage = 0; |
| m_Offset = 0; |
| m_dwLastObjNum = m_pDocument->GetLastObjNum(); |
| m_ObjectOffsets.clear(); |
| m_NewObjNumArray.clear(); |
| InitID(); |
| if (flags & FPDFCREATE_PROGRESSIVE) |
| return true; |
| return Continue() > -1; |
| } |
| |
| void CPDF_Creator::InitID(bool bDefault) { |
| CPDF_Array* pOldIDArray = m_pParser ? m_pParser->GetIDArray() : nullptr; |
| bool bNewId = !m_pIDArray; |
| if (bNewId) { |
| m_pIDArray = pdfium::MakeUnique<CPDF_Array>(); |
| CPDF_Object* pID1 = pOldIDArray ? pOldIDArray->GetObjectAt(0) : nullptr; |
| if (pID1) { |
| m_pIDArray->Add(pID1->Clone()); |
| } else { |
| std::vector<uint8_t> buffer = |
| GenerateFileID((uint32_t)(uintptr_t)this, m_dwLastObjNum); |
| CFX_ByteString bsBuffer(buffer.data(), buffer.size()); |
| m_pIDArray->AddNew<CPDF_String>(bsBuffer, true); |
| } |
| } |
| if (!bDefault) |
| return; |
| |
| if (pOldIDArray) { |
| CPDF_Object* pID2 = pOldIDArray->GetObjectAt(1); |
| if (IsIncremental() && m_pEncryptDict && pID2) { |
| m_pIDArray->Add(pID2->Clone()); |
| return; |
| } |
| std::vector<uint8_t> buffer = |
| GenerateFileID((uint32_t)(uintptr_t)this, m_dwLastObjNum); |
| CFX_ByteString bsBuffer(buffer.data(), buffer.size()); |
| m_pIDArray->AddNew<CPDF_String>(bsBuffer, true); |
| return; |
| } |
| |
| m_pIDArray->Add(m_pIDArray->GetObjectAt(0)->Clone()); |
| if (m_pEncryptDict && !pOldIDArray && m_pParser && bNewId) { |
| if (m_pEncryptDict->GetStringFor("Filter") == "Standard") { |
| CFX_ByteString user_pass = m_pParser->GetPassword(); |
| uint32_t flag = PDF_ENCRYPT_CONTENT; |
| CPDF_SecurityHandler handler; |
| handler.OnCreate(m_pEncryptDict, m_pIDArray.get(), user_pass.raw_str(), |
| user_pass.GetLength(), flag); |
| m_pCryptoHandler = pdfium::MakeRetain<CPDF_CryptoHandler>(); |
| m_pCryptoHandler->Init(m_pEncryptDict, &handler); |
| m_bSecurityChanged = true; |
| } |
| } |
| } |
| |
| int32_t CPDF_Creator::Continue() { |
| if (m_iStage < 0) |
| return m_iStage; |
| |
| int32_t iRet = 0; |
| while (m_iStage < 100) { |
| if (m_iStage < 20) |
| iRet = WriteDoc_Stage1(); |
| else if (m_iStage < 30) |
| iRet = WriteDoc_Stage2(); |
| else if (m_iStage < 90) |
| iRet = WriteDoc_Stage3(); |
| else |
| iRet = WriteDoc_Stage4(); |
| |
| if (iRet < m_iStage) |
| break; |
| } |
| |
| if (iRet < 1 || m_iStage == 100) { |
| m_iStage = -1; |
| Clear(); |
| return iRet > 99 ? 0 : (iRet < 1 ? -1 : iRet); |
| } |
| return m_iStage; |
| } |
| |
| bool CPDF_Creator::SetFileVersion(int32_t fileVersion) { |
| if (fileVersion < 10 || fileVersion > 17) |
| return false; |
| |
| m_FileVersion = fileVersion; |
| return true; |
| } |
| |
| void CPDF_Creator::IncrementOffset(FX_FILESIZE inc) { |
| pdfium::base::CheckedNumeric<FX_FILESIZE> size = m_Offset; |
| size += inc; |
| m_Offset = size.ValueOrDie(); |
| } |
| |
| void CPDF_Creator::RemoveSecurity() { |
| m_pCryptoHandler.Reset(); |
| m_bSecurityChanged = true; |
| m_pEncryptDict = nullptr; |
| } |
