/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */ /* * This file is part of the LibreOffice project. * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include #include #include #include #include #include #include #include namespace svt { namespace { bool isWordFormat(const OUString& sExt) { return sExt.equalsIgnoreAsciiCase("DOC") || sExt.equalsIgnoreAsciiCase("DOCX") || sExt.equalsIgnoreAsciiCase("RTF") || sExt.equalsIgnoreAsciiCase("ODT"); } bool isExcelFormat(const OUString& sExt) { return //sExt.equalsIgnoreAsciiCase("XLS") || // MSO does not create lockfile for XLS sExt.equalsIgnoreAsciiCase("XLSX") || sExt.equalsIgnoreAsciiCase("ODS"); } bool isPowerPointFormat(const OUString& sExt) { return sExt.equalsIgnoreAsciiCase("PPTX") || sExt.equalsIgnoreAsciiCase("PPT") || sExt.equalsIgnoreAsciiCase("ODP"); } // Need to generate different lock file name for MSO. OUString GenerateMSOLockFileURL(const OUString& aOrigURL) { INetURLObject aURL = LockFileCommon::ResolveLinks(INetURLObject(aOrigURL)); // For text documents MSO Word cuts some of the first characters of the file name OUString sFileName = aURL.GetLastName(); const OUString sExt = aURL.GetFileExtension(); if (isWordFormat(sExt)) { const sal_Int32 nFileNameLength = sFileName.getLength() - sExt.getLength() - 1; if (nFileNameLength >= 8) sFileName = sFileName.copy(2); else if (nFileNameLength == 7) sFileName = sFileName.copy(1); } aURL.SetName("~$" + sFileName); return aURL.GetMainURL(INetURLObject::DecodeMechanism::NONE); } } // static MSODocumentLockFile::AppType MSODocumentLockFile::getAppType(const OUString& sOrigURL) { AppType eResult = AppType::PowerPoint; INetURLObject aDocURL = LockFileCommon::ResolveLinks(INetURLObject(sOrigURL)); const OUString sExt = aDocURL.GetFileExtension(); if (isWordFormat(sExt)) eResult = AppType::Word; else if (isExcelFormat(sExt)) eResult = AppType::Excel; return eResult; } MSODocumentLockFile::MSODocumentLockFile(const OUString& aOrigURL) : GenDocumentLockFile(GenerateMSOLockFileURL(aOrigURL)) , m_eAppType(getAppType(aOrigURL)) { } MSODocumentLockFile::~MSODocumentLockFile() {} void MSODocumentLockFile::WriteEntryToStream( const LockFileEntry& aEntry, const css::uno::Reference& xOutput) { ::osl::MutexGuard aGuard(m_aMutex); // Reallocate the date with the right size, different lock file size for different components int nLockFileSize = m_eAppType == AppType::Word ? MSO_WORD_LOCKFILE_SIZE : MSO_EXCEL_AND_POWERPOINT_LOCKFILE_SIZE; css::uno::Sequence aData(nLockFileSize); // Write out the user name's length as a single byte integer // The maximum length is 52 in MSO, so we'll need to truncate the user name if it's longer OUString aUserName = aEntry[LockFileComponent::OOOUSERNAME]; int nIndex = 0; aData[nIndex] = static_cast( std::min(aUserName.getLength(), sal_Int32(MSO_USERNAME_MAX_LENGTH))); if (aUserName.getLength() > MSO_USERNAME_MAX_LENGTH) aUserName = aUserName.copy(0, MSO_USERNAME_MAX_LENGTH); // From the second position write out the user name using one byte characters. nIndex = 1; for (int nChar = 0; nChar < aUserName.getLength(); ++nChar) { aData[nIndex] = static_cast(aUserName[nChar]); ++nIndex; } // Fill up the remaining bytes with dummy data switch (m_eAppType) { case AppType::Word: while (nIndex < MSO_USERNAME_MAX_LENGTH + 2) { aData[nIndex] = static_cast(0); ++nIndex; } break; case AppType::PowerPoint: aData[nIndex] = static_cast(0); ++nIndex; [[fallthrough]]; case AppType::Excel: while (nIndex < MSO_USERNAME_MAX_LENGTH + 3) { aData[nIndex] = static_cast(0x20); ++nIndex; } break; } // At the next position we have the user name's length again, but now as a 2 byte integer aData[nIndex] = static_cast( std::min(aUserName.getLength(), sal_Int32(MSO_USERNAME_MAX_LENGTH))); ++nIndex; aData[nIndex] = 0; ++nIndex; // And the user name again with unicode characters for (int nChar = 0; nChar < aUserName.getLength(); ++nChar) { aData[nIndex] = static_cast(aUserName[nChar] & 0xff); ++nIndex; aData[nIndex] = static_cast(aUserName[nChar] >> 8); ++nIndex; } // Fill the remaining part with dummy bits switch (m_eAppType) { case AppType::Word: while (nIndex < nLockFileSize) { aData[nIndex] = static_cast(0); ++nIndex; } break; case AppType::Excel: case AppType::PowerPoint: while (nIndex < nLockFileSize) { aData[nIndex] = static_cast(0x20); ++nIndex; if (nIndex < nLockFileSize) { aData[nIndex] = static_cast(0); ++nIndex; } } break; } xOutput->writeBytes(aData); } css::uno::Reference MSODocumentLockFile::OpenStream() { ::osl::MutexGuard aGuard(m_aMutex); css::uno::Reference xEnv; ::ucbhelper::Content aSourceContent(GetURL(), xEnv, comphelper::getProcessComponentContext()); // the file can be opened readonly, no locking will be done return aSourceContent.openStreamNoLock(); } LockFileEntry MSODocumentLockFile::GetLockData() { ::osl::MutexGuard aGuard(m_aMutex); LockFileEntry aResult; css::uno::Reference xInput = OpenStream(); if (!xInput.is()) throw css::uno::RuntimeException(); const sal_Int32 nBufLen = 256; css::uno::Sequence aBuf(nBufLen); const sal_Int32 nRead = xInput->readBytes(aBuf, nBufLen); xInput->closeInput(); if (nRead >= 162) { // Reverse engineering of MS Office Owner Files format (MS Office 2016 tested). // It starts with a single byte with name length, after which characters of username go // in current Windows 8-bit codepage. // For Word lockfiles, the name is followed by zero bytes up to position 54. // For PowerPoint lockfiles, the name is followed by a single zero byte, and then 0x20 // bytes up to position 55. // For Excel lockfiles, the name is followed by 0x20 bytes up to position 55. // At those positions in each type of lockfile, a name length 2-byte word goes, followed // by UTF-16-LE-encoded copy of username. Spaces or some garbage follow up to the end of // the lockfile (total 162 bytes for Word, 165 bytes for Excel/PowerPoint). // Apparently MS Office does not allow username to be longer than 52 characters (trying // to enter more in its options dialog results in error messages stating this limit). const int nACPLen = aBuf[0]; if (nACPLen > 0 && nACPLen <= 52) // skip wrong format { const sal_Int8* pBuf = aBuf.getConstArray() + 54; int nUTF16Len = *pBuf; // try Word position // If UTF-16 length is 0x20, then ACP length is also less than maximal, which means // that in Word lockfile case, at least two preceding bytes would be zero. Both // Excel and PowerPoint lockfiles would have at least one of those bytes non-zero. if (nUTF16Len == 0x20 && (*(pBuf - 1) != 0 || *(pBuf - 2) != 0)) nUTF16Len = *++pBuf; // use Excel/PowerPoint position if (nUTF16Len > 0 && nUTF16Len <= 52) // skip wrong format aResult[LockFileComponent::OOOUSERNAME] = OUString(reinterpret_cast(pBuf + 2), nUTF16Len); } } return aResult; } void MSODocumentLockFile::RemoveFile() { ::osl::MutexGuard aGuard(m_aMutex); // TODO/LATER: the removing is not atomic, is it possible in general to make it atomic? LockFileEntry aNewEntry = GenerateOwnEntry(); LockFileEntry aFileData = GetLockData(); if (aFileData[LockFileComponent::OOOUSERNAME] != aNewEntry[LockFileComponent::OOOUSERNAME]) throw css::io::IOException(); // not the owner, access denied RemoveFileDirectly(); } bool MSODocumentLockFile::IsMSOSupportedFileFormat(const OUString& aURL) { INetURLObject aDocURL = LockFileCommon::ResolveLinks(INetURLObject(aURL)); const OUString sExt = aDocURL.GetFileExtension(); return isWordFormat(sExt) || isExcelFormat(sExt) || isPowerPointFormat(sExt); } } // namespace svt /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ wFrameBorder'>feature/SwFrameBorder LibreOffice 核心代码仓库文档基金会
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