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416 | /* -*- 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 "storlckb.hxx"
#include <sal/types.h>
#include <rtl/string.h>
#include <rtl/ref.hxx>
#include <osl/mutex.hxx>
#include <store/types.h>
#include "storbase.hxx"
#include "stordata.hxx"
#include "storpage.hxx"
using namespace store;
/*========================================================================
*
* OStoreLockBytes implementation.
*
*======================================================================*/
const sal_uInt32 OStoreLockBytes::m_nTypeId(0x94190310);
/*
* OStoreLockBytes.
*/
OStoreLockBytes::OStoreLockBytes()
: m_xManager (),
m_xNode (),
m_bWriteable (false)
{
}
/*
* ~OStoreLockBytes.
*/
OStoreLockBytes::~OStoreLockBytes()
{
if (m_xManager.is() && m_xNode.is())
{
m_xManager->releasePage(m_xNode->m_aDescr);
}
}
/*
* isKindOf.
*/
bool OStoreLockBytes::isKindOf (sal_uInt32 nTypeId)
{
return (nTypeId == m_nTypeId);
}
/*
* create.
*/
storeError OStoreLockBytes::create (
OStorePageManager *pManager,
rtl_String const *pPath,
rtl_String const *pName,
storeAccessMode eMode)
{
rtl::Reference<OStorePageManager> xManager (pManager);
if (!xManager.is())
return store_E_InvalidAccess;
if (!(pPath && pName))
return store_E_InvalidParameter;
OStoreDirectoryPageObject aPage;
storeError eErrCode = xManager->iget (
aPage, STORE_ATTRIB_ISFILE,
pPath, pName, eMode);
if (eErrCode != store_E_None)
return eErrCode;
if (!(aPage.attrib() & STORE_ATTRIB_ISFILE))
{
// No ISFILE in older versions (backward compatibility).
if (aPage.attrib() & STORE_ATTRIB_ISLINK)
return store_E_NotFile;
}
inode_holder_type xNode (aPage.get());
if (eMode != storeAccessMode::ReadOnly)
eErrCode = xManager->acquirePage (xNode->m_aDescr, storeAccessMode::ReadWrite);
else
eErrCode = xManager->acquirePage (xNode->m_aDescr, storeAccessMode::ReadOnly);
if (eErrCode != store_E_None)
return eErrCode;
m_xManager = xManager;
m_xNode = xNode;
m_bWriteable = (eMode != storeAccessMode::ReadOnly);
// Check for truncation.
if (eMode == storeAccessMode::Create)
{
// Truncate to zero length.
eErrCode = setSize(0);
}
return eErrCode;
}
/*
* readAt.
*/
storeError OStoreLockBytes::readAt (
sal_uInt32 nOffset,
void *pBuffer,
sal_uInt32 nBytes,
sal_uInt32 &rnDone)
{
rnDone = 0;
if (!m_xManager.is())
return store_E_InvalidAccess;
if (!pBuffer)
return store_E_InvalidParameter;
if (!nBytes)
return store_E_None;
// Acquire exclusive access.
osl::MutexGuard aGuard (*m_xManager);
// Determine data length.
OStoreDirectoryPageObject aPage (m_xNode.get());
sal_uInt32 nDataLen = aPage.dataLength();
if ((nOffset + nBytes) > nDataLen)
nBytes = nDataLen - nOffset;
// Read data.
OStoreDataPageObject aData;
sal_uInt8 *pData = static_cast<sal_uInt8*>(pBuffer);
while ((0 < nBytes) && (nOffset < nDataLen))
{
// Determine 'Offset' scope.
inode::ChunkScope eScope = m_xNode->scope (nOffset);
if (eScope == inode::SCOPE_INTERNAL)
{
// Read from inode page (internal scope).
inode::ChunkDescriptor aDescr (
nOffset, m_xNode->capacity());
sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
if(nLength > nBytes)
{
nLength = nBytes;
}
memcpy (
&pData[rnDone],
&m_xNode->m_pData[aDescr.m_nOffset],
nLength);
// Adjust counters.
rnDone += nLength;
nOffset += nLength;
nBytes -= nLength;
}
else
{
// Read from data page (external scope).
inode::ChunkDescriptor aDescr (
nOffset - m_xNode->capacity(), OStoreDataPageData::capacity(m_xNode->m_aDescr)); // @@@
sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
if(nLength > nBytes)
{
nLength = nBytes;
}
storeError eErrCode = aPage.read (aDescr.m_nPage, aData, *m_xManager);
if (eErrCode != store_E_None)
{
if (eErrCode != store_E_NotExists)
return eErrCode;
memset (
&pData[rnDone],
0,
nLength);
}
else
{
PageHolderObject< data > xData (aData.makeHolder<data>());
memcpy (
&pData[rnDone],
&xData->m_pData[aDescr.m_nOffset],
nLength);
}
// Adjust counters.
rnDone += nLength;
nOffset += nLength;
nBytes -= nLength;
}
}
// Done.
return store_E_None;
}
/*
* writeAt.
*/
storeError OStoreLockBytes::writeAt (
sal_uInt32 nOffset,
const void *pBuffer,
sal_uInt32 nBytes,
sal_uInt32 &rnDone)
{
rnDone = 0;
if (!m_xManager.is())
return store_E_InvalidAccess;
if (!m_bWriteable)
return store_E_AccessViolation;
if (!pBuffer)
return store_E_InvalidParameter;
if (!nBytes)
return store_E_None;
// Acquire exclusive access.
osl::MutexGuard aGuard (*m_xManager);
// Write data.
OStoreDirectoryPageObject aPage (m_xNode.get());
const sal_uInt8 *pData = static_cast<const sal_uInt8*>(pBuffer);
storeError eErrCode = store_E_None;<--- Variable 'eErrCode' is assigned a value that is never used.
while (nBytes > 0)
{
// Determine 'Offset' scope.
inode::ChunkScope eScope = m_xNode->scope (nOffset);
if (eScope == inode::SCOPE_INTERNAL)
{
// Write to inode page (internal scope).
inode::ChunkDescriptor aDescr (
nOffset, m_xNode->capacity());
sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
if(nLength > nBytes)
{
nLength = nBytes;
}
memcpy (
&m_xNode->m_pData[aDescr.m_nOffset],
&pData[rnDone], nLength);
// Mark inode dirty.
aPage.touch();
// Adjust counters.
rnDone += nLength;
nOffset += nLength;
nBytes -= nLength;
// Adjust data length.
if (aPage.dataLength() < nOffset)
aPage.dataLength (nOffset);
}
else
{
// Write to data page (external scope).
OStoreDataPageObject aData;
inode::ChunkDescriptor aDescr (
nOffset - m_xNode->capacity(), OStoreDataPageData::capacity(m_xNode->m_aDescr)); // @@@
sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
if ((aDescr.m_nOffset > 0) || (nBytes < nLength))
{
// Unaligned. Need to load/create data page.
// @@@ loadOrCreate()
eErrCode = aPage.read (aDescr.m_nPage, aData, *m_xManager);
if (eErrCode != store_E_None)
{
if (eErrCode != store_E_NotExists)
return eErrCode;
eErrCode = aData.construct<data>(m_xManager->allocator());
if (eErrCode != store_E_None)
return eErrCode;
}
}
PageHolderObject< data > xData (aData.makeHolder<data>());
if (!xData.is())
{
eErrCode = aData.construct<data>(m_xManager->allocator());
if (eErrCode != store_E_None)
return eErrCode;
xData = aData.makeHolder<data>();
}
// Modify data page.
if(nLength > nBytes)
{
nLength = nBytes;
}
memcpy (
&xData->m_pData[aDescr.m_nOffset],
&pData[rnDone], nLength);
// Save data page.
eErrCode = aPage.write (aDescr.m_nPage, aData, *m_xManager);
if (eErrCode != store_E_None)
return eErrCode;
// Adjust counters.
rnDone += nLength;
nOffset += nLength;
nBytes -= nLength;
// Adjust data length.
if (aPage.dataLength() < nOffset)
aPage.dataLength (nOffset);
}
}
// Check for modified inode.
if (aPage.dirty())
return m_xManager->saveObjectAt (aPage, aPage.location());
else
return store_E_None;
}
/*
* setSize.
*/
storeError OStoreLockBytes::setSize (sal_uInt32 nSize)
{
if (!m_xManager.is())
return store_E_InvalidAccess;
if (!m_bWriteable)
return store_E_AccessViolation;
// Acquire exclusive access.
osl::MutexGuard aGuard (*m_xManager);
// Determine current length.
OStoreDirectoryPageObject aPage (m_xNode.get());
sal_uInt32 nDataLen = aPage.dataLength();
if (nSize == nDataLen)
return store_E_None;
if (nSize < nDataLen)
{
// Truncate.
storeError eErrCode = store_E_None;<--- Variable 'eErrCode' is assigned a value that is never used.
// Determine 'Size' scope.
inode::ChunkScope eSizeScope = m_xNode->scope (nSize);
if (eSizeScope == inode::SCOPE_INTERNAL)
{
// Internal 'Size' scope. Determine 'Data' scope.
inode::ChunkScope eDataScope = m_xNode->scope (nDataLen);
if (eDataScope == inode::SCOPE_EXTERNAL)
{
// External 'Data' scope. Truncate all external data pages.
eErrCode = aPage.truncate (0, *m_xManager);
if (eErrCode != store_E_None)
return eErrCode;
}
// Truncate internal data page.
inode::ChunkDescriptor aDescr (nSize, m_xNode->capacity());
memset (
&(m_xNode->m_pData[aDescr.m_nOffset]),
0, aDescr.m_nLength);
}
else
{
// External 'Size' scope. Truncate external data pages.
inode::ChunkDescriptor aDescr (
nSize - m_xNode->capacity(), OStoreDataPageData::capacity(m_xNode->m_aDescr)); // @@@
sal_uInt32 nPage = aDescr.m_nPage;
if (aDescr.m_nOffset) nPage += 1;
eErrCode = aPage.truncate (nPage, *m_xManager);
if (eErrCode != store_E_None)
return eErrCode;
}
}
// Set (extended or truncated) size.
aPage.dataLength (nSize);
// Save modified inode.
return m_xManager->saveObjectAt (aPage, aPage.location());
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|