diff options
Diffstat (limited to 'store/source/lockbyte.cxx')
| -rw-r--r-- | store/source/lockbyte.cxx | 907 |
1 files changed, 907 insertions, 0 deletions
diff --git a/store/source/lockbyte.cxx b/store/source/lockbyte.cxx new file mode 100644 index 000000000..4a163fff6 --- /dev/null +++ b/store/source/lockbyte.cxx @@ -0,0 +1,907 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * 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/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include "lockbyte.hxx" + +#include <sal/types.h> +#include <osl/diagnose.h> +#include <osl/file.h> +#include <osl/process.h> +#include <rtl/ustring.hxx> +#include <sal/log.hxx> + +#include "object.hxx" +#include "storbase.hxx" + +#include <memory> +#include <string.h> + +using namespace store; + +/*======================================================================== + * + * ILockBytes (non-virtual interface) implementation. + * + *======================================================================*/ + +storeError ILockBytes::initialize (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize) +{ + OSL_PRECOND((STORE_MINIMUM_PAGESIZE <= nPageSize) && (nPageSize <= STORE_MAXIMUM_PAGESIZE), "invalid PageSize"); + return initialize_Impl (rxAllocator, nPageSize); +} + +storeError ILockBytes::readPageAt (std::shared_ptr<PageData> & rPage, sal_uInt32 nOffset) +{ + OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::ILockBytes::readPageAt(): invalid Offset"); + if (nOffset == STORE_PAGE_NULL) + return store_E_CantSeek; + + return readPageAt_Impl (rPage, nOffset); +} + +storeError ILockBytes::writePageAt (std::shared_ptr<PageData> const & rPage, sal_uInt32 nOffset) +{ + // [SECURITY:ValInput] + PageData const * pagedata = rPage.get(); + OSL_PRECOND(!(pagedata == nullptr), "store::ILockBytes::writePageAt(): invalid Page"); + if (pagedata == nullptr) + return store_E_InvalidParameter; + + sal_uInt32 const offset = pagedata->location(); + OSL_PRECOND(!(nOffset != offset), "store::ILockBytes::writePageAt(): inconsistent Offset"); + if (nOffset != offset) + return store_E_InvalidParameter; + + OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::ILockBytes::writePageAt(): invalid Offset"); + if (nOffset == STORE_PAGE_NULL) + return store_E_CantSeek; + + return writePageAt_Impl (rPage, nOffset); +} + +storeError ILockBytes::readAt (sal_uInt32 nOffset, void * pBuffer, sal_uInt32 nBytes) +{ + // [SECURITY:ValInput] + sal_uInt8 * dst_lo = static_cast<sal_uInt8*>(pBuffer); + if (dst_lo == nullptr) + return store_E_InvalidParameter; + + sal_uInt8 * dst_hi = dst_lo + nBytes; + if (dst_lo >= dst_hi) + return (dst_lo > dst_hi) ? store_E_InvalidParameter : store_E_None; + + OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::ILockBytes::readAt(): invalid Offset"); + if (nOffset == STORE_PAGE_NULL) + return store_E_CantSeek; + + sal_uInt64 const src_size = static_cast<sal_uInt64>(nOffset) + nBytes; + if (src_size > SAL_MAX_UINT32) + return store_E_CantSeek; + + return readAt_Impl (nOffset, dst_lo, nBytes); +} + +storeError ILockBytes::writeAt (sal_uInt32 nOffset, void const * pBuffer, sal_uInt32 nBytes) +{ + // [SECURITY:ValInput] + sal_uInt8 const * src_lo = static_cast<sal_uInt8 const*>(pBuffer); + if (src_lo == nullptr) + return store_E_InvalidParameter; + + sal_uInt8 const * src_hi = src_lo + nBytes; + if (src_lo >= src_hi) + return (src_lo > src_hi) ? store_E_InvalidParameter : store_E_None; + + OSL_PRECOND(!(nOffset == STORE_PAGE_NULL), "store::ILockBytes::writeAt(): invalid Offset"); + if (nOffset == STORE_PAGE_NULL) + return store_E_CantSeek; + + sal_uInt64 const dst_size = static_cast<sal_uInt64>(nOffset) + nBytes; + if (dst_size > SAL_MAX_UINT32) + return store_E_CantSeek; + + return writeAt_Impl (nOffset, src_lo, nBytes); +} + +storeError ILockBytes::getSize (sal_uInt32 & rnSize) +{ + rnSize = 0; + return getSize_Impl (rnSize); +} + +storeError ILockBytes::setSize (sal_uInt32 nSize) +{ + return setSize_Impl (nSize); +} + +storeError ILockBytes::flush() +{ + return flush_Impl(); +} + +/*======================================================================== + * + * FileLockBytes implementation. + * + *======================================================================*/ +namespace store +{ + +namespace { + +struct FileHandle +{ + oslFileHandle m_handle; + + FileHandle() : m_handle(nullptr) {} + + bool operator != (FileHandle const & rhs) + { + return (m_handle != rhs.m_handle); + } + + static storeError errorFromNative (oslFileError eErrno) + { + switch (eErrno) + { + case osl_File_E_None: + return store_E_None; + + case osl_File_E_NOENT: + return store_E_NotExists; + + case osl_File_E_ACCES: + case osl_File_E_PERM: + return store_E_AccessViolation; + + case osl_File_E_AGAIN: + case osl_File_E_DEADLK: + return store_E_LockingViolation; + + case osl_File_E_BADF: + return store_E_InvalidHandle; + + case osl_File_E_INVAL: + return store_E_InvalidParameter; + + case osl_File_E_NOMEM: + return store_E_OutOfMemory; + + case osl_File_E_NOSPC: + return store_E_OutOfSpace; + + case osl_File_E_OVERFLOW: + return store_E_CantSeek; + + default: + return store_E_Unknown; + } + } + + static sal_uInt32 modeToNative (storeAccessMode eAccessMode) + { + sal_uInt32 nFlags = 0; + switch (eAccessMode) + { + case storeAccessMode::Create: + nFlags |= osl_File_OpenFlag_Create; + [[fallthrough]]; + case storeAccessMode::ReadWrite: + nFlags |= osl_File_OpenFlag_Write; + [[fallthrough]]; + case storeAccessMode::ReadOnly: + nFlags |= osl_File_OpenFlag_Read; + break; + default: + OSL_PRECOND(false, "store::FileHandle: unknown storeAccessMode"); + } + return nFlags; + } + + storeError initialize (rtl_uString * pFilename, storeAccessMode eAccessMode) + { + // Verify arguments. + sal_uInt32 nFlags = modeToNative (eAccessMode); + if (!pFilename || !nFlags) + return store_E_InvalidParameter; + + // Convert into FileUrl. + OUString aFileUrl; + if (osl_getFileURLFromSystemPath (pFilename, &(aFileUrl.pData)) != osl_File_E_None) + { + // Not system path. Assume file url. + rtl_uString_assign (&(aFileUrl.pData), pFilename); + } + if (!aFileUrl.startsWith("file://")) + { + // Not file url. Assume relative path. + OUString aCwdUrl; + (void) osl_getProcessWorkingDir (&(aCwdUrl.pData)); + + // Absolute file url. + (void) osl_getAbsoluteFileURL (aCwdUrl.pData, aFileUrl.pData, &(aFileUrl.pData)); + } + + // Acquire handle. + oslFileError result = osl_openFile (aFileUrl.pData, &m_handle, nFlags); + if (result == osl_File_E_EXIST) + { + // Already existing (O_CREAT | O_EXCL). + result = osl_openFile (aFileUrl.pData, &m_handle, osl_File_OpenFlag_Read | osl_File_OpenFlag_Write); + if ((result == osl_File_E_None) && (eAccessMode == storeAccessMode::Create)) + { + // Truncate existing file. + result = osl_setFileSize (m_handle, 0); + } + } + if (result != osl_File_E_None) + return errorFromNative(result); + return store_E_None; + } + + /** @see FileLockBytes destructor + */ + static void closeFile (oslFileHandle hFile) + { + (void) osl_closeFile (hFile); + } + + /** @see ResourceHolder<T>::destructor_type + */ + struct CloseFile + { + void operator()(FileHandle & rFile) const + { + // Release handle. + closeFile (rFile.m_handle); + rFile.m_handle = nullptr; + } + }; + typedef CloseFile destructor_type; +}; + +class FileLockBytes : + public store::OStoreObject, + public store::ILockBytes +{ + /** Representation. + */ + oslFileHandle m_hFile; + sal_uInt32 m_nSize; + rtl::Reference< PageData::Allocator > m_xAllocator; + + storeError initSize_Impl (sal_uInt32 & rnSize); + + /** ILockBytes implementation. + */ + virtual storeError initialize_Impl (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize) override; + + virtual storeError readPageAt_Impl (std::shared_ptr<PageData> & rPage, sal_uInt32 nOffset) override; + virtual storeError writePageAt_Impl (std::shared_ptr<PageData> const & rPage, sal_uInt32 nOffset) override; + + virtual storeError readAt_Impl (sal_uInt32 nOffset, void * pBuffer, sal_uInt32 nBytes) override; + virtual storeError writeAt_Impl (sal_uInt32 nOffset, void const * pBuffer, sal_uInt32 nBytes) override; + + virtual storeError getSize_Impl (sal_uInt32 & rnSize) override; + virtual storeError setSize_Impl (sal_uInt32 nSize) override; + + virtual storeError flush_Impl() override; + +public: + /** Construction. + */ + explicit FileLockBytes (FileHandle const & rFile); + + FileLockBytes(const FileLockBytes&) = delete; + FileLockBytes& operator=(const FileLockBytes&) = delete; + +protected: + /** Destruction. + */ + virtual ~FileLockBytes() override; +}; + +} + +} // namespace store + +FileLockBytes::FileLockBytes (FileHandle const & rFile) + : m_hFile (rFile.m_handle), m_nSize (SAL_MAX_UINT32) +{ +} + +FileLockBytes::~FileLockBytes() +{ + FileHandle::closeFile (m_hFile); +} + +storeError FileLockBytes::initSize_Impl (sal_uInt32 & rnSize) +{ + /* osl_getFileSize() uses slow 'fstat(h, &size)', + * instead of fast 'size = lseek(h, 0, SEEK_END)'. + * so, init size here, and track changes. + */ + sal_uInt64 uSize = 0; + oslFileError result = osl_getFileSize (m_hFile, &uSize); + if (result != osl_File_E_None) + return FileHandle::errorFromNative(result); + if (uSize > SAL_MAX_UINT32) + return store_E_CantSeek; + + rnSize = sal::static_int_cast<sal_uInt32>(uSize); + return store_E_None; +} + +storeError FileLockBytes::initialize_Impl (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize) +{ + storeError result = initSize_Impl (m_nSize); + if (result != store_E_None) + return result; + + result = PageData::Allocator::createInstance (rxAllocator, nPageSize); + if (result != store_E_None) + return result; + + // @see readPageAt_Impl(). + m_xAllocator = rxAllocator; + return store_E_None; +} + +storeError FileLockBytes::readPageAt_Impl (std::shared_ptr<PageData> & rPage, sal_uInt32 nOffset) +{ + if (m_xAllocator.is()) + { + std::shared_ptr<PageData> page (m_xAllocator->construct<PageData>(), PageData::Deallocate(m_xAllocator)); + page.swap (rPage); + } + + if (!m_xAllocator.is()) + return store_E_InvalidAccess; + if (!rPage) + return store_E_OutOfMemory; + + PageData * pagedata = rPage.get(); + return readAt_Impl (nOffset, pagedata, pagedata->size()); +} + +storeError FileLockBytes::writePageAt_Impl (std::shared_ptr<PageData> const & rPage, sal_uInt32 nOffset) +{ + PageData const * pagedata = rPage.get(); + OSL_PRECOND(pagedata != nullptr, "contract violation"); + return writeAt_Impl (nOffset, pagedata, pagedata->size()); +} + +storeError FileLockBytes::readAt_Impl (sal_uInt32 nOffset, void * pBuffer, sal_uInt32 nBytes) +{ + sal_uInt64 nDone = 0; + oslFileError result = osl_readFileAt (m_hFile, nOffset, pBuffer, nBytes, &nDone); + if (result != osl_File_E_None) + return FileHandle::errorFromNative(result); + if (nDone != nBytes) + return (nDone != 0) ? store_E_CantRead : store_E_NotExists; + return store_E_None; +} + +storeError FileLockBytes::writeAt_Impl (sal_uInt32 nOffset, void const * pBuffer, sal_uInt32 nBytes) +{ + sal_uInt64 nDone = 0; + oslFileError result = osl_writeFileAt (m_hFile, nOffset, pBuffer, nBytes, &nDone); + if (result != osl_File_E_None) + return FileHandle::errorFromNative(result); + if (nDone != nBytes) + return store_E_CantWrite; + + sal_uInt64 const uSize = nOffset + nBytes; + OSL_PRECOND(uSize < SAL_MAX_UINT32, "store::ILockBytes::writeAt() contract violation"); + if (uSize > m_nSize) + m_nSize = sal::static_int_cast<sal_uInt32>(uSize); + return store_E_None; +} + +storeError FileLockBytes::getSize_Impl (sal_uInt32 & rnSize) +{ + rnSize = m_nSize; + return store_E_None; +} + +storeError FileLockBytes::setSize_Impl (sal_uInt32 nSize) +{ + oslFileError result = osl_setFileSize (m_hFile, nSize); + if (result != osl_File_E_None) + return FileHandle::errorFromNative(result); + + m_nSize = nSize; + return store_E_None; +} + +storeError FileLockBytes::flush_Impl() +{ + oslFileError result = osl_syncFile (m_hFile); + if (result != osl_File_E_None) + return FileHandle::errorFromNative(result); + return store_E_None; +} + +/*======================================================================== + * + * MappedLockBytes implementation. + * + *======================================================================*/ +namespace store +{ + +namespace { + +struct FileMapping +{ + sal_uInt8 * m_pAddr; + sal_uInt32 m_nSize; + oslFileHandle m_hFile; + + FileMapping() : m_pAddr(nullptr), m_nSize(0), m_hFile(nullptr) {} + + bool operator != (FileMapping const & rhs) const + { + return ((m_pAddr != rhs.m_pAddr) || (m_nSize != rhs.m_nSize)); + } + + oslFileError initialize (oslFileHandle hFile) + { + // Determine mapping size. + sal_uInt64 uSize = 0; + oslFileError result = osl_getFileSize (hFile, &uSize); + if (result != osl_File_E_None) + return result; + + // [SECURITY:IntOver] + if (uSize > SAL_MAX_UINT32) + return osl_File_E_OVERFLOW; + m_nSize = sal::static_int_cast<sal_uInt32>(uSize); + + m_hFile = hFile; + + // Acquire mapping. + return osl_mapFile (hFile, reinterpret_cast<void**>(&m_pAddr), m_nSize, 0, osl_File_MapFlag_RandomAccess); + } + + /** @see MappedLockBytes::destructor. + */ + static void unmapFile (oslFileHandle hFile, sal_uInt8 * pAddr, sal_uInt32 nSize) + { + (void) osl_unmapMappedFile (hFile, pAddr, nSize); + (void) osl_closeFile (hFile); + } + + /** @see ResourceHolder<T>::destructor_type + */ + struct UnmapFile + { + void operator ()(FileMapping & rMapping) const + { + // Release mapping. + unmapFile (rMapping.m_hFile, rMapping.m_pAddr, rMapping.m_nSize); + rMapping.m_pAddr = nullptr; + rMapping.m_nSize = 0; + } + }; + typedef UnmapFile destructor_type; +}; + +class MappedLockBytes : + public store::OStoreObject, + public store::PageData::Allocator, + public store::ILockBytes +{ + /** Representation. + */ + sal_uInt8 * m_pData; + sal_uInt32 m_nSize; + sal_uInt16 m_nPageSize; + oslFileHandle m_hFile; + + /** PageData::Allocator implementation. + */ + virtual void allocate_Impl (void ** ppPage, sal_uInt16 * pnSize) override; + virtual void deallocate_Impl (void * pPage) override; + + /** ILockBytes implementation. + */ + virtual storeError initialize_Impl (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize) override; + + virtual storeError readPageAt_Impl (std::shared_ptr<PageData> & rPage, sal_uInt32 nOffset) override; + virtual storeError writePageAt_Impl (std::shared_ptr<PageData> const & rPage, sal_uInt32 nOffset) override; + + virtual storeError readAt_Impl (sal_uInt32 nOffset, void * pBuffer, sal_uInt32 nBytes) override; + virtual storeError writeAt_Impl (sal_uInt32 nOffset, const void * pBuffer, sal_uInt32 nBytes) override; + + virtual storeError getSize_Impl (sal_uInt32 & rnSize) override; + virtual storeError setSize_Impl (sal_uInt32 nSize) override; + + virtual storeError flush_Impl() override; + +public: + /** Construction. + */ + explicit MappedLockBytes (FileMapping const & rMapping); + + MappedLockBytes(const MappedLockBytes&) = delete; + MappedLockBytes& operator=(const MappedLockBytes&) = delete; + +protected: + /* Destruction. + */ + virtual ~MappedLockBytes() override; +}; + +} + +} // namespace store + +MappedLockBytes::MappedLockBytes (FileMapping const & rMapping) + : m_pData (rMapping.m_pAddr), m_nSize (rMapping.m_nSize), m_nPageSize(0), m_hFile (rMapping.m_hFile) +{ +} + +MappedLockBytes::~MappedLockBytes() +{ + FileMapping::unmapFile (m_hFile, m_pData, m_nSize); +} + +void MappedLockBytes::allocate_Impl (void ** ppPage, sal_uInt16 * pnSize) +{ + OSL_PRECOND((ppPage != nullptr) && (pnSize != nullptr), "contract violation"); + if ((ppPage != nullptr) && (pnSize != nullptr)) + { + *ppPage = nullptr; + *pnSize = m_nPageSize; + } +} + +void MappedLockBytes::deallocate_Impl (void * pPage) +{ + OSL_PRECOND((m_pData <= pPage) && (pPage < m_pData + m_nSize), "contract violation"); +} + +storeError MappedLockBytes::initialize_Impl (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize) +{ + rxAllocator = this; + m_nPageSize = nPageSize; + return store_E_None; +} + +storeError MappedLockBytes::readPageAt_Impl (std::shared_ptr<PageData> & rPage, sal_uInt32 nOffset) +{ + sal_uInt8 * src_lo = m_pData + nOffset; + if ((m_pData > src_lo) || (src_lo >= m_pData + m_nSize)) + return store_E_NotExists; + + sal_uInt8 * src_hi = src_lo + m_nPageSize; + if ((m_pData > src_hi) || (src_hi > m_pData + m_nSize)) + return store_E_CantRead; + + std::shared_ptr<PageData> page (reinterpret_cast< PageData* >(src_lo), PageData::Deallocate(static_cast< PageData::Allocator* >(this))); + page.swap (rPage); + + return store_E_None; +} + +storeError MappedLockBytes::writePageAt_Impl (std::shared_ptr<PageData> const & /*rPage*/, sal_uInt32 /*nOffset*/) +{ + return store_E_AccessViolation; +} + +storeError MappedLockBytes::readAt_Impl (sal_uInt32 nOffset, void * pBuffer, sal_uInt32 nBytes) +{ + sal_uInt8 const * src_lo = m_pData + nOffset; + if ((m_pData > src_lo) || (src_lo >= m_pData + m_nSize)) + return store_E_NotExists; + + sal_uInt8 const * src_hi = src_lo + nBytes; + if ((m_pData > src_hi) || (src_hi > m_pData + m_nSize)) + return store_E_CantRead; + + memcpy (pBuffer, src_lo, (src_hi - src_lo)); + return store_E_None; +} + +storeError MappedLockBytes::writeAt_Impl (sal_uInt32 /*nOffset*/, void const * /*pBuffer*/, sal_uInt32 /*nBytes*/) +{ + return store_E_AccessViolation; +} + +storeError MappedLockBytes::getSize_Impl (sal_uInt32 & rnSize) +{ + rnSize = m_nSize; + return store_E_None; +} + +storeError MappedLockBytes::setSize_Impl (sal_uInt32 /*nSize*/) +{ + return store_E_AccessViolation; +} + +storeError MappedLockBytes::flush_Impl() +{ + return store_E_None; +} + +/*======================================================================== + * + * MemoryLockBytes implementation. + * + *======================================================================*/ +namespace store +{ + +namespace { + +class MemoryLockBytes : + public store::OStoreObject, + public store::ILockBytes +{ + /** Representation. + */ + sal_uInt8 * m_pData; + sal_uInt32 m_nSize; + rtl::Reference< PageData::Allocator > m_xAllocator; + + /** ILockBytes implementation. + */ + virtual storeError initialize_Impl (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize) override; + + virtual storeError readPageAt_Impl (std::shared_ptr<PageData> & rPage, sal_uInt32 nOffset) override; + virtual storeError writePageAt_Impl (std::shared_ptr<PageData> const & rPage, sal_uInt32 nOffset) override; + + virtual storeError readAt_Impl (sal_uInt32 nOffset, void * pBuffer, sal_uInt32 nBytes) override; + virtual storeError writeAt_Impl (sal_uInt32 nOffset, const void * pBuffer, sal_uInt32 nBytes) override; + + virtual storeError getSize_Impl (sal_uInt32 & rnSize) override; + virtual storeError setSize_Impl (sal_uInt32 nSize) override; + + virtual storeError flush_Impl() override; + +public: + /** Construction. + */ + MemoryLockBytes(); + + MemoryLockBytes(const MemoryLockBytes&) = delete; + MemoryLockBytes& operator=(const MemoryLockBytes&) = delete; + +protected: + /** Destruction. + */ + virtual ~MemoryLockBytes() override; +}; + +} + +} // namespace store + +MemoryLockBytes::MemoryLockBytes() + : m_pData (nullptr), m_nSize (0) +{} + +MemoryLockBytes::~MemoryLockBytes() +{ + std::free (m_pData); +} + +storeError MemoryLockBytes::initialize_Impl (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize) +{ + storeError result = PageData::Allocator::createInstance (rxAllocator, nPageSize); + if (result == store_E_None) + { + // @see readPageAt_Impl(). + m_xAllocator = rxAllocator; + } + return result; +} + +storeError MemoryLockBytes::readPageAt_Impl (std::shared_ptr<PageData> & rPage, sal_uInt32 nOffset) +{ + if (m_xAllocator.is()) + { + std::shared_ptr<PageData> page (m_xAllocator->construct<PageData>(), PageData::Deallocate(m_xAllocator)); + page.swap (rPage); + } + + if (!m_xAllocator.is()) + return store_E_InvalidAccess; + if (!rPage) + return store_E_OutOfMemory; + + PageData * pagedata = rPage.get(); + return readAt_Impl (nOffset, pagedata, pagedata->size()); +} + +storeError MemoryLockBytes::writePageAt_Impl (std::shared_ptr<PageData> const & rPage, sal_uInt32 nOffset) +{ + PageData const * pagedata = rPage.get(); + OSL_PRECOND(!(pagedata == nullptr), "contract violation"); + return writeAt_Impl (nOffset, pagedata, pagedata->size()); +} + +storeError MemoryLockBytes::readAt_Impl (sal_uInt32 nOffset, void * pBuffer, sal_uInt32 nBytes) +{ + sal_uInt8 const * src_lo = m_pData + nOffset; + if ((m_pData > src_lo) || (src_lo >= m_pData + m_nSize)) + return store_E_NotExists; + + sal_uInt8 const * src_hi = src_lo + nBytes; + if ((m_pData > src_hi) || (src_hi > m_pData + m_nSize)) + return store_E_CantRead; + + memcpy (pBuffer, src_lo, (src_hi - src_lo)); + return store_E_None; +} + +storeError MemoryLockBytes::writeAt_Impl (sal_uInt32 nOffset, const void * pBuffer, sal_uInt32 nBytes) +{ + sal_uInt64 const dst_size = nOffset + nBytes; + OSL_PRECOND(dst_size < SAL_MAX_UINT32, "store::ILockBytes::writeAt() contract violation"); + if (dst_size > m_nSize) + { + storeError eErrCode = setSize_Impl (sal::static_int_cast<sal_uInt32>(dst_size)); + if (eErrCode != store_E_None) + return eErrCode; + } + SAL_WARN_IF(dst_size > m_nSize, "store", "store::MemoryLockBytes::setSize_Impl() contract violation"); + + sal_uInt8 * dst_lo = m_pData + nOffset; + if (dst_lo >= m_pData + m_nSize) + return store_E_CantSeek; + + sal_uInt8 * dst_hi = dst_lo + nBytes; + if (dst_hi > m_pData + m_nSize) + return store_E_CantWrite; + + memcpy (dst_lo, pBuffer, (dst_hi - dst_lo)); + return store_E_None; +} + +storeError MemoryLockBytes::getSize_Impl (sal_uInt32 & rnSize) +{ + rnSize = m_nSize; + return store_E_None; +} + +storeError MemoryLockBytes::setSize_Impl (sal_uInt32 nSize) +{ + if (nSize != m_nSize) + { + sal_uInt8 * pData = static_cast<sal_uInt8*>(std::realloc (m_pData, nSize)); + if (pData != nullptr) + { + if (nSize > m_nSize) + memset (pData + m_nSize, 0, sal::static_int_cast<size_t>(nSize - m_nSize)); + } + else + { + if (nSize != 0) + return store_E_OutOfMemory; + } + m_pData = pData; + m_nSize = nSize; + } + return store_E_None; +} + +storeError MemoryLockBytes::flush_Impl() +{ + return store_E_None; +} + +/*======================================================================== + * + * ILockBytes factory implementations. + * + *======================================================================*/ +namespace store +{ + +namespace { + +template< class T > struct ResourceHolder +{ + typedef typename T::destructor_type destructor_type; + + T m_value; + + explicit ResourceHolder (T const & value = T()) : m_value (value) {} + ~ResourceHolder() { reset(T()); } + + T & get() { return m_value; } + T const & get() const { return m_value; } + + void set (T const & value) { m_value = value; } + void reset (T const & value) + { + T tmp (m_value); + if (tmp != value) + destructor_type()(tmp); + set (value); + } + T release() + { + T tmp (m_value); + set (T()); + return tmp; + } + + ResourceHolder & operator= (ResourceHolder & rhs) + { + reset (rhs.release()); + return *this; + } +}; + +} + +storeError +FileLockBytes_createInstance ( + rtl::Reference< ILockBytes > & rxLockBytes, + rtl_uString * pFilename, + storeAccessMode eAccessMode +) +{ + // Acquire file handle. + ResourceHolder<FileHandle> xFile; + storeError result = xFile.get().initialize (pFilename, eAccessMode); + if (result != store_E_None) + return result; + + if (eAccessMode == storeAccessMode::ReadOnly) + { + ResourceHolder<FileMapping> xMapping; + if (xMapping.get().initialize (xFile.get().m_handle) == osl_File_E_None) + { + rxLockBytes = new MappedLockBytes (xMapping.get()); + if (!rxLockBytes.is()) + return store_E_OutOfMemory; + (void) xFile.release(); + (void) xMapping.release(); + } + } + if (!rxLockBytes.is()) + { + rxLockBytes = new FileLockBytes (xFile.get()); + if (!rxLockBytes.is()) + return store_E_OutOfMemory; + (void) xFile.release(); + } + + return store_E_None; +} + +storeError +MemoryLockBytes_createInstance ( + rtl::Reference< ILockBytes > & rxLockBytes +) +{ + rxLockBytes = new MemoryLockBytes(); + if (!rxLockBytes.is()) + return store_E_OutOfMemory; + + return store_E_None; +} + +} // namespace store + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |