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FragExp.cpp
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/* FragExt - Shell extension for providing file fragmentation
* information.
*
* Copyright (C) 2004-2006 Jeremy Boschen. All rights reserved.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software in
* a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source
* distribution.
*/
/* FragExp.h
* FragEng export implementations
*
* Copyright (C) 2004-2006 Jeremy Boschen
*
* Version History
* 0.0.001 - 12/12/2006 - Created
*/
#include "Stdafx.h"
#include "FragExp.h"
/**********************************************************************
Public
**********************************************************************/
DWORD FRAGAPI FpOpenFile( LPCWSTR FileName, HANDLE* FileHandle ) throw()
{
DWORD dwErr;
DWORD dwShareMode;
DWORD dwAccessMode;
DWORD dwAttributes;
/* Validate parameters */
if ( !FileName || !FileHandle )
{
/* Failure */
return ( ERROR_INVALID_PARAMETER );
}
(*FileHandle) = INVALID_HANDLE_VALUE;
/* Initialize locals... */
dwShareMode = FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE;
dwAccessMode = FILE_READ_ATTRIBUTES;
SetLastError(NO_ERROR);
dwAttributes = GetFileAttributes(FileName);
if ( INVALID_FILE_ATTRIBUTES == dwAttributes )
{
dwErr = GetLastError();
/* Failure */
return ( dwErr );
}
if ( (FILE_ATTRIBUTE_ENCRYPTED & dwAttributes) && !_IsWinNT(MAKELONG(5,1)) )
{
dwAccessMode |= FILE_READ_DATA;
}
while ( 0 != dwShareMode )
{
(*FileHandle) = CreateFileW(FileName,
dwAccessMode,
dwShareMode,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING|FILE_FLAG_BACKUP_SEMANTICS,
NULL);
if ( INVALID_HANDLE_VALUE != (*FileHandle) )
{
dwErr = NO_ERROR;
/* Success */
return ( dwErr );
}
/* Failed to open the file with the current share rights, so try the
* next least restrictive set */
dwShareMode >>= 1;
}
dwErr = GetLastError();
/* Failure */
return ( dwErr );
}
DWORD FRAGAPI FpOpenContext( LPCWSTR FileName, DWORD Flags, HANDLE* hFragCtx ) throw()
{
DWORD dwErr;
DWORD dwAttr;
size_t cchFile;
size_t cbData;
LARGE_INTEGER cbFile;
ULARGE_INTEGER cbFileOnDisk;
PFRAG_CONTEXT pFragCtx;
UNREFERENCED_PARAMETER(Flags);
/* Initialize locals... */
pFragCtx = NULL;
/* Validate input parameters and initialize output parameters */
if ( !FileName || !hFragCtx )
{
dwErr = ERROR_INVALID_PARAMETER;
/* Failure */
goto __CLEANUP;
}
(*hFragCtx) = NULL;
dwAttr = GetFileAttributes(FileName);
if ( INVALID_FILE_ATTRIBUTES == dwAttr )
{
dwErr = GetLastError();
/* Failure */
goto __CLEANUP;
}
/* Allocate and initialize the context record */
cchFile = wcslen(FileName);
_ASSERTE(cchFile > 0);
cbData = (cchFile * sizeof(WCHAR)) + sizeof(FRAG_CONTEXT);
pFragCtx = reinterpret_cast<PFRAG_CONTEXT>(new BYTE[cbData]);
if ( !pFragCtx )
{
dwErr = ERROR_OUTOFMEMORY;
/* Failure */
return ( dwErr );
}
ZeroMemory(pFragCtx,
cbData);
/* Attempt to open the file. This sets File to what is expected by the cleanup code upon failure. */
dwErr = FpOpenFile(FileName,
&pFragCtx->File);
if ( NO_ERROR != dwErr )
{
/* Failure */
goto __CLEANUP;
}
if ( !GetFileSizeEx(pFragCtx->File,
&cbFile) )
{
dwErr = GetLastError();
/* Failure */
goto __CLEANUP;
}
pFragCtx->FileSize = static_cast<ULONGLONG>(cbFile.QuadPart);
pFragCtx->FileSizeOnDisk = 0;
pFragCtx->ClusterSize = _GetFileBytesPerCluster(FileName);
if ( 0 == pFragCtx->ClusterSize )
{
dwErr = ERROR_CAN_NOT_COMPLETE;
/* Failure */
goto __CLEANUP;
}
if ( FAILED(StringCchCopyW(pFragCtx->FileName,
cchFile + 1,
FileName)) )
{
dwErr = ERROR_BAD_ARGUMENTS;
/* Failure */
goto __CLEANUP;
}
dwErr = FpiInitializeFragInfo(pFragCtx,
Flags);
if ( NO_ERROR != dwErr )
{
/* Failure */
goto __CLEANUP;
}
if ( (FILE_ATTRIBUTE_COMPRESSED|FILE_ATTRIBUTE_SPARSE_FILE) & dwAttr )
{
cbFileOnDisk.LowPart = GetCompressedFileSize(FileName,
&cbFileOnDisk.HighPart);
if ( INVALID_FILE_SIZE == cbFileOnDisk.LowPart )
{
dwErr = GetLastError();
if ( NO_ERROR != dwErr )
{
/* Failure */
goto __CLEANUP;
}
}
}
else
{
cbFileOnDisk.QuadPart = (static_cast<ULONGLONG>(pFragCtx->ClusterSize) * pFragCtx->ClusterCount);
}
pFragCtx->FileSizeOnDisk = cbFileOnDisk.QuadPart;
(*hFragCtx) = FragContextToHandle(pFragCtx);
/* Success */
pFragCtx = NULL;
dwErr = NO_ERROR;
__CLEANUP:
if ( NULL != pFragCtx )
{
if ( INVALID_HANDLE_VALUE != pFragCtx->File )
{
CloseHandle(pFragCtx->File);
}
delete [] reinterpret_cast<BYTE*>(pFragCtx);
}
/* Success / Failure */
return ( dwErr );
}
VOID FRAGAPI FpCloseContext( HANDLE hFragCtx ) throw()
{
PFRAG_CONTEXT pFragCtx;
HANDLE hFile;
/* Validate parameters */
if ( !IsValidFragContextHandle(hFragCtx) )
{
SetLastError(ERROR_INVALID_HANDLE);
/* Failure */
return;
}
/* Initialize locals... */
pFragCtx = HandleToFragContext(hFragCtx);
/* To be able to preserve an error caused by the call to CloseHandle(), the handle is cached and the
* record is deleted prior to the handle being closed */
hFile = pFragCtx->File;
delete [] reinterpret_cast<BYTE*>(pFragCtx);
SetLastError(NO_ERROR);
if ( INVALID_HANDLE_VALUE != hFile )
{
CloseHandle(hFile);
}
}
DWORD FRAGAPI FpGetFileInfo( HANDLE FragCtx, PFRAGCTXINFO CtxInfo )
{
PFRAG_CONTEXT pFragCtx;
/* Validate parameters */
if ( !IsValidFragContextHandle(FragCtx) )
{
/* Failure */
return ( ERROR_INVALID_HANDLE );
}
if ( !CtxInfo )
{
/* Failure */
return ( ERROR_INVALID_PARAMETER );
}
/* Initialize locals */
pFragCtx = HandleToFragContext(FragCtx);
/* Copy fixed size members... */
CtxInfo->FileSize = pFragCtx->FileSize;
CtxInfo->FileSizeOnDisk = pFragCtx->FileSizeOnDisk;
CtxInfo->ClusterCount = pFragCtx->ClusterCount;
CtxInfo->FragmentCount = pFragCtx->FragmentCount;
CtxInfo->ExtentCount = pFragCtx->ExtentCount;
CtxInfo->ClusterSize = pFragCtx->ClusterSize;
/* Success */
return ( NO_ERROR );
}
DWORD FRAGAPI FpGetFileName( HANDLE hFragCtx, LPWSTR FileName, ULONG FileNameLength ) throw()
{
PFRAG_CONTEXT pFragCtx;
/* Validate parameters */
if ( !IsValidFragContextHandle(hFragCtx) )
{
/* Failure */
return ( ERROR_INVALID_HANDLE );
}
if ( !FileName )
{
/* Failure */
return ( ERROR_INVALID_PARAMETER );
}
/* Initialize locals */
pFragCtx = HandleToFragContext(hFragCtx);
if ( FAILED(StringCchCopy(FileName,
static_cast<size_t>(FileNameLength),
pFragCtx->FileName)) )
{
/* Failure */
return ( ERROR_BUFFER_OVERFLOW );
}
/* Success */
return ( NO_ERROR );
}
DWORD FRAGAPI FpGetFileFragmentInfo( HANDLE FragCtx, ULONG SequenceId, PFRAGMENTINFO FragmentInfo ) throw()
{
PFRAG_CONTEXT pFragCtx;
/* Validate parameters */
if ( !IsValidFragContextHandle(FragCtx) )
{
/* Failure */
return ( ERROR_INVALID_HANDLE );
}
/* Initialize locals */
pFragCtx = HandleToFragContext(FragCtx);
/* Ensure the fragment exists. Sequence IDs are 1 based, so they are always less than or equal to
* the fragment count */
if ( (SequenceId == 0) || (SequenceId > pFragCtx->FragmentCount) )
{
/* Failure */
return ( ERROR_INVALID_INDEX );
}
_ASSERT(NULL != pFragCtx->FragmentInfo);
/* The sequence id is a 1 based index */
(*FragmentInfo) = pFragCtx->FragmentInfo[SequenceId - 1];
/* Success */
return ( NO_ERROR );
}
DWORD FRAGAPI FpEnumFileFragmentInfo( HANDLE hFragCtx, PENUMFILEFRAGMENTINFOPROC Callback, PVOID Parameter ) throw()
{
DWORD dwErr;
PFRAG_CONTEXT pFragCtx;
PFRAGMENTINFO pFragInfo;
ULONG iFragCount;
ULONG iIdx;
/* Validate in/out parameters */
if ( !IsValidFragContextHandle(hFragCtx) )
{
/* Failure */
return ( ERROR_INVALID_HANDLE );
}
if ( !Callback )
{
/* Failure */
return ( ERROR_INVALID_PARAMETER );
}
/* Initialize locals */
dwErr = NO_ERROR;
pFragCtx = HandleToFragContext(hFragCtx);
pFragInfo = pFragCtx->FragmentInfo;
iFragCount = pFragCtx->FragmentCount;
for ( iIdx = 0; iIdx < iFragCount; iIdx++ )
{
/* Pass this one on to the caller */
dwErr = (*Callback)(Parameter,
hFragCtx,
&pFragInfo[iIdx]);
if ( NO_ERROR != dwErr )
{
/* Caller failed prematurely */
break;
}
}
/* Success / Failure */
return ( dwErr );
}
DWORD FRAGAPI FpDefragmentFile( LPCWSTR FileName, DWORD Flags, PDEFRAGMENTFILEPROC Callback, PVOID Parameter ) throw()
{
DWORD dwErr;
HANDLE hFile;
HANDLE hVolume;
ULONG cbFragData;
PRETRIEVAL_POINTERS_BUFFER pFragData;
DWORD iIdx;
ULONGLONG iVCN;
ULONGLONG iLCN;
DWORD iBlockSize;
ULONGLONG iClustersTotal;
ULONGLONG iClustersMoved;
ULONGLONG iClustersRemaining;
ULONGLONG iClustersBlock;
ULONGLONG iClustersExtent;
PEXTENT pExtent;
BOOL bRet;
DWORD cbRet;
MOVE_FILE_DATA MoveData;
/* Validate parameters */
/* Initialize locals */
hFile = INVALID_HANDLE_VALUE;
hVolume = INVALID_HANDLE_VALUE;
pFragData = NULL;
iBlockSize = GetClusterBlockSize(Flags);
iBlockSize = max(iBlockSize, FPIF_DEFRAG_CLUSTERBLOCKSIZE_MIN);
/* Open the file */
dwErr = FpOpenFile(FileName,
&hFile);
if ( NO_ERROR != dwErr )
{
/* Failure */
goto __CLEANUP;
}
/* Open a handle to the file's volume */
hVolume = FpiOpenFileVolume(FileName);
if ( INVALID_HANDLE_VALUE == hVolume )
{
dwErr = GetLastError();
/* Failure */
goto __CLEANUP;
}
/* Load the retrieval pointer data */
dwErr = FpiGetRetrievalPointers(hFile,
FPF_RAWEXTENTDATA,
reinterpret_cast<PVOID*>(&pFragData),
&cbFragData);
if ( NO_ERROR != dwErr )
{
if ( ERROR_HANDLE_EOF == dwErr )
{
/* This code is returned for files that do not have extent data, such as those that fit
* within their MFT record. Map it to success and return */
dwErr = NO_ERROR;
}
/* Success / Failure */
goto __CLEANUP;
}
_ASSERTE(NULL != pFragData);
/* Update the extent data so that each extent's Lcn is the actual number of clusters,
* not relative to the previous extent. Also sum up the total number of clusters */
iClustersTotal = pFragData->Extents[0].NextVcn.QuadPart;
for ( iIdx = pFragData->ExtentCount - 1; iIdx >= 1; iIdx-- )
{
pFragData->Extents[iIdx].NextVcn.QuadPart -= pFragData->Extents[iIdx - 1].NextVcn.QuadPart;
iClustersTotal += pFragData->Extents[iIdx].NextVcn.QuadPart;
}
/* Initialize the starting LCN for searching free space */
iVCN = pFragData->StartingVcn.QuadPart;
iLCN = 0;
iClustersMoved = 0;
iClustersRemaining = iClustersTotal;
pExtent = reinterpret_cast<PEXTENT>(pFragData->Extents);
iClustersExtent = pExtent->ClusterCount;
while ( true )
{
dwErr = FpiLocateFreeClusterRange(hVolume,
iClustersRemaining,
&iLCN);
if ( NO_ERROR != dwErr )
{
/* Failure */
goto __CLEANUP;
}
while ( iClustersRemaining )
{
MoveData.ClusterCount = static_cast<DWORD>(min(iBlockSize, iClustersRemaining));
MoveData.FileHandle = hFile;
MoveData.StartingVcn.QuadPart = iVCN;
MoveData.StartingLcn.QuadPart = iLCN;
bRet = DeviceIoControl(hVolume,
FSCTL_MOVE_FILE,
&MoveData,
sizeof(MoveData),
NULL,
0,
&cbRet,
NULL);
if ( !bRet )
{
dwErr = GetLastError();
/* For whatever reason this move failed so break out and search for
* a new area */
break;
}
/* The virtual cluster number (VCN) will always move up by the number of clusters
* moved, regardless of whether they were physical or compressed/sparse. The same
* goes for the total remaining */
iVCN += static_cast<ULONGLONG>(MoveData.ClusterCount);
iClustersRemaining -= static_cast<ULONGLONG>(MoveData.ClusterCount);
/* The logical cluster number (LCN) only moves up by the number of physical clusters
* moved. This loop calculates how many physical clusters were part of this move and
* increments the extent data for the next iteration */
while ( MoveData.ClusterCount > 0 )
{
iClustersBlock = iClustersExtent;
if ( iClustersBlock > MoveData.ClusterCount )
{
iClustersBlock = MoveData.ClusterCount;
}
MoveData.ClusterCount -= static_cast<DWORD>(iClustersBlock);
iClustersExtent -= iClustersBlock;
if ( !IsVirtualCluster(pExtent->LCN) )
{
iClustersMoved += iClustersBlock;
iLCN += iClustersBlock;
}
if ( 0 == iClustersExtent )
{
pExtent += 1;
iClustersExtent = pExtent->ClusterCount;
}
}
/* Notify the caller of the update */
if ( NULL != Callback )
{
dwErr = (*Callback)(Parameter,
FileName,
iClustersTotal,
iClustersMoved);
/* If the callback routine has returned a failure code, then abort */
if ( NO_ERROR != dwErr )
{
/* Callback failure */
goto __CLEANUP;
}
}
}
if ( 0 == iClustersRemaining )
{
dwErr = NO_ERROR;
/* Success */
goto __CLEANUP;
}
}
__CLEANUP:
FpiFreeRetrievalPointers(pFragData);
if ( INVALID_HANDLE_VALUE != hVolume )
{
CloseHandle(hVolume);
}
if ( NULL != hFile )
{
CloseHandle(hFile);
}
/* Success / Failure */
return ( dwErr );
}
DWORD FRAGAPI FpEnumFileStreamInfo( PVOID File, DWORD Flags, PENUMFILESTREAMINFOPROC Callback, PVOID Parameter ) throw()
{
DWORD dwErr;
SYSTEM_INFO SysInfo;
HANDLE hFile;
ULONG cbBuff;
PVOID pBuff;
NTSTATUS NtStatus;
IO_STATUS_BLOCK IoStatus;
ULONG iStreams;
PFILE_STREAM_INFORMATION pStream;
WCHAR chTerm;
BOOL bDefault;
/* Validate input params */
if ( !File || !Callback || !((FPF_OPENBYFILENAME|FPF_OPENBYFILEHANDLE) & Flags) )
{
/* Failure */
return ( ERROR_INVALID_PARAMETER );
}
/* Initialize locals */
GetSystemInfo(&SysInfo);
hFile = INVALID_HANDLE_VALUE;
cbBuff = 0;
pBuff = NULL;
if ( FPF_OPENBYFILENAME & Flags )
{
/* Attempt to open the file */
dwErr = FpOpenFile(reinterpret_cast<LPCWSTR>(File),
&hFile);
}
else
{
hFile = reinterpret_cast<HANDLE>(File);
if ( INVALID_HANDLE_VALUE != hFile )
{
dwErr = NO_ERROR;
}
else
{
dwErr = ERROR_INVALID_HANDLE;
}
}
if ( NO_ERROR != dwErr )
{
/* Failure */
goto __CLEANUP;
}
/* Get the stream information */
while ( true )
{
cbBuff += SysInfo.dwAllocationGranularity;
pBuff = VirtualAlloc(NULL,
cbBuff,
MEM_COMMIT,
PAGE_READWRITE);
if ( !pBuff )
{
dwErr = ERROR_OUTOFMEMORY;
/* Failure */
goto __CLEANUP;
}
NtStatus = NtQueryInformationFile(hFile,
&IoStatus,
pBuff,
cbBuff,
FileStreamInformation);
if ( NT_SUCCESS(NtStatus) )
{
break;
}
if ( STATUS_BUFFER_OVERFLOW != NtStatus )
{
dwErr = RtlNtStatusToDosError(NtStatus);
if ( NO_ERROR == dwErr )
{
dwErr = ERROR_GEN_FAILURE;
}
/* Failure */
goto __CLEANUP;
}
VirtualFree(pBuff,
0,
MEM_RELEASE);
pBuff = NULL;
}
/* First get a count of the streams */
pStream = reinterpret_cast<PFILE_STREAM_INFORMATION>(pBuff);
iStreams = 0;
while ( true )
{
iStreams += 1;
if ( 0 == pStream->NextEntryOffset )
{
break;
}
/* Bump up to the next stream record */
pStream = reinterpret_cast<PFILE_STREAM_INFORMATION>(reinterpret_cast<ULONG_PTR>(pStream) + pStream->NextEntryOffset);
}
/* Enumerate over the stream data */
bDefault = false;
pStream = reinterpret_cast<PFILE_STREAM_INFORMATION>(pBuff);
while ( true )
{
if ( FPF_STREAM_NODEFAULTDATASTREAM & Flags )
{
bDefault = (0 == memcmp(L"::$DATA",
pStream->StreamName,
min(pStream->StreamNameLength, sizeof(L"::$DATA"))) ? TRUE : FALSE);
}
if ( !bDefault )
{
/* Make sure the stream name is null terminated */
chTerm = pStream->StreamName[pStream->StreamNameLength / sizeof(WCHAR)];
pStream->StreamName[pStream->StreamNameLength / sizeof(WCHAR)] = L'\0';
dwErr = (*Callback)(Parameter,
iStreams,
static_cast<ULONGLONG>(pStream->EndOfStream.QuadPart),
pStream->StreamName);
if ( NO_ERROR != dwErr )
{
/* Failure */
goto __CLEANUP;
}
/* Reset whatever character was swapped out for the null term */
pStream->StreamName[pStream->StreamNameLength / sizeof(WCHAR)] = chTerm;
}
if ( 0 == pStream->NextEntryOffset )
{
break;
}
/* Bump up to the next stream record */
pStream = reinterpret_cast<PFILE_STREAM_INFORMATION>(reinterpret_cast<ULONG_PTR>(pStream) + pStream->NextEntryOffset);
}
/* Success */
dwErr = NO_ERROR;
__CLEANUP:
if ( NULL != pBuff )
{
VirtualFree(pBuff,
0,
MEM_RELEASE);
}
/* Only close the file handle if this routine created it */
if ( (Flags & FPF_OPENBYFILENAME) && (INVALID_HANDLE_VALUE != hFile) )
{
CloseHandle(hFile);
}
/* Success / Failure */
return ( dwErr );
}
/**********************************************************************
Private
**********************************************************************/
LPVOID FpiAlloc( DWORD dwFlags, SIZE_T cbAlloc ) throw()
{
return ( HeapAlloc(GetProcessHeap(),
dwFlags,
cbAlloc) );
}
VOID FpiFree( DWORD dwFlags, LPVOID pMem ) throw()
{
HeapFree(GetProcessHeap(),
dwFlags,
pMem);
}
DWORD FpiGetFileHandle( PVOID pFile, DWORD Flags, HANDLE* phFile ) throw()
{
DWORD dwErr;
BOOL bRet;
/* Initialize locals */
dwErr = ERROR_INVALID_PARAMETER;
if ( FPF_OPENBYFILENAME & Flags )
{
dwErr = FpOpenFile(reinterpret_cast<LPCWSTR>(pFile),
phFile);
}
else if ( (FPF_OPENBYFILEHANDLE|FPF_OPENBYCONTEXT) & Flags )
{
bRet = DuplicateHandle(GetCurrentProcess(),
Flags & FPF_OPENBYFILEHANDLE ? reinterpret_cast<HANDLE>(pFile) : reinterpret_cast<PFRAG_CONTEXT>(pFile)->File,
GetCurrentProcess(),
phFile,
0,
FALSE,
DUPLICATE_SAME_ACCESS);
if ( !bRet )
{
dwErr = GetLastError();
}
else
{
dwErr = NO_ERROR;
}
}
/* Success / Failure */
return ( dwErr );
}
HANDLE FpiOpenFileVolume( LPCWSTR pwszFile ) throw()
{
HANDLE hVolume;
size_t cchVolumeGuid;
WCHAR chVolumeGuid[50];
WCHAR chVolumeName[MAX_PATH];
/* Initialize locals */
hVolume = INVALID_HANDLE_VALUE;
/* Determine the actual volume name for the file */
if ( !GetVolumePathNameW(pwszFile,
chVolumeName,
_countof(chVolumeName)) )
{
/* Failure */
return ( INVALID_HANDLE_VALUE );
}
/* Get the guid name for the volume */
if ( !GetVolumeNameForVolumeMountPointW(chVolumeName,
chVolumeGuid,
_countof(chVolumeGuid)) )
{
/* Failure */
return ( INVALID_HANDLE_VALUE );
}
/* CreateFile() requires that there is no trailing \ on a volume guid
* name, so remove it if it is there */
cchVolumeGuid = wcslen(chVolumeGuid);
if ( cchVolumeGuid > 0 )
{
if ( L'\\' == chVolumeGuid[--cchVolumeGuid] )
{
chVolumeGuid[cchVolumeGuid] = L'\0';
}
}
/* Open the volume with an access right that will force it to be mounted
* if it presently isn't */
hVolume = CreateFileW(chVolumeGuid,
FILE_GENERIC_READ,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL);
/* Success / Failure */
return ( hVolume );
}
DWORD FpiGetRetrievalPointers( HANDLE hFile, DWORD dwFlags, PVOID* ppBuff, ULONG* pcbBuff ) throw()
{
DWORD dwErr;
BOOL bRet;
SYSTEM_INFO SysInfo;
DWORD cbRet;
DWORD cbBuff;
PRETRIEVAL_POINTERS_BUFFER pBuff;
LONGLONG iVCN;
UNREFERENCED_PARAMETER(dwFlags);
/* Initialize outputs */
(*ppBuff) = NULL;
(*pcbBuff) = 0;
/* Initialize locals */
GetSystemInfo(&SysInfo);
dwErr = NO_ERROR;
cbBuff = 0;
pBuff = NULL;
/* Retrieve all of the file's extent info */
while ( true )
{
cbBuff += SysInfo.dwPageSize;
pBuff = reinterpret_cast<PRETRIEVAL_POINTERS_BUFFER>(FpiAlloc(HEAP_ZERO_MEMORY,
cbBuff));
if ( !pBuff )
{
dwErr = ERROR_OUTOFMEMORY;
/* Failure */
goto __CLEANUP;
}
iVCN = 0;
cbRet = 0;
bRet = DeviceIoControl(hFile,
FSCTL_GET_RETRIEVAL_POINTERS,
&iVCN,
sizeof(iVCN),
pBuff,
cbBuff,
&cbRet,
NULL);
if ( bRet )
{
/* Do not allow returning 0 extents. This occurs for directories when they fit in a file record */
if ( 0 == pBuff->ExtentCount )
{
dwErr = ERROR_HANDLE_EOF;
/* Failure */
goto __CLEANUP;
}
/* Success */
break;
}
dwErr = GetLastError();
if ( ERROR_MORE_DATA != dwErr )
{
/* ERROR_HANDLE_EOF is returned for files with no extent data */
/* Failure */
goto __CLEANUP;
}
/* Need a larger buffer, so free this one and start over */
FpiFree(0,
pBuff);
pBuff = NULL;
}
(*ppBuff) = pBuff;
(*pcbBuff) = cbRet;
dwErr = NO_ERROR;
pBuff = NULL;
__CLEANUP:
if ( NULL != pBuff )
{
FpiFree(0,
pBuff);
}
/* Success / Failure */
return ( dwErr );
}
VOID FpiFreeRetrievalPointers( PVOID pBuff ) throw()
{