diff options
Diffstat (limited to 'core/fpdfapi/edit/cpdf_creator.cpp')
| -rw-r--r-- | core/fpdfapi/edit/cpdf_creator.cpp | 1024 |
1 files changed, 1024 insertions, 0 deletions
diff --git a/core/fpdfapi/edit/cpdf_creator.cpp b/core/fpdfapi/edit/cpdf_creator.cpp new file mode 100644 index 0000000000..32dd28456e --- /dev/null +++ b/core/fpdfapi/edit/cpdf_creator.cpp @@ -0,0 +1,1024 @@ +// 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) + : 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) {} + +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(const CFX_RetainPtr<IFX_WriteStream>& pFile, + uint32_t flags) { + m_File.AttachFile(pFile); + return Create(flags); +} + +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; +} |