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windows-nt/Source/XPSP1/NT/shell/shell32/stg2stgx.cpp

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//+-------------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1999.
//
// File: Stg2StgX.cpp
//
// Contents: Wrapper object that takes an IStorage and makes it act like and ITransferDest
//
// History: 18-July-2000 ToddB
//
//--------------------------------------------------------------------------
#include "shellprv.h"
#include "ids.h"
#pragma hdrstop
#include "isproc.h"
#include "ConfirmationUI.h"
#include "clsobj.h"
class CShellItem2TransferDest : public ITransferDest
{
public:
// IUnknown
STDMETHOD_(ULONG, AddRef)();
STDMETHOD_(ULONG, Release)();
STDMETHOD(QueryInterface)(REFIID riid, void **ppvObj);
// ITransferDest
STDMETHOD(Advise)(ITransferAdviseSink *pAdvise, DWORD *pdwCookie);
STDMETHOD(Unadvise)(DWORD dwCookie);
STDMETHOD(OpenElement)(
const WCHAR *pwcsName,
STGXMODE grfMode,
DWORD *pdwType,
REFIID riid,
void **ppunk);
STDMETHOD(CreateElement)(
const WCHAR *pwcsName,
IShellItem *psiTemplate,
STGXMODE grfMode,
DWORD dwType,
REFIID riid,
void **ppunk);
STDMETHOD(MoveElement)(
IShellItem *psiItem,
WCHAR *pwcsNewName, // Pointer to new name of element in destination
STGXMOVE grfOptions); // Options (STGMOVEEX_ enum)
STDMETHOD(DestroyElement)(
const WCHAR *pwcsName,
STGXDESTROY grfOptions);
// commented out in the interface declaration
STDMETHOD(RenameElement)(
const WCHAR *pwcsOldName,
const WCHAR *pwcsNewName);
// CShellItem2TransferDest
CShellItem2TransferDest();
STDMETHOD(Init)(IShellItem *psi, IStorageProcessor *pEngine);
protected:
ULONG _cRef;
IShellItem *_psi;
ITransferAdviseSink *_ptas;
IStorageProcessor *_pEngine;
BOOL _fWebFolders;
~CShellItem2TransferDest();
HRESULT _OpenHelper(const WCHAR *pwcsName, DWORD grfMode, DWORD *pdwType, REFIID riid, void **ppunk);
HRESULT _CreateHelper(const WCHAR *pwcsName, DWORD grfMode, DWORD dwType, REFIID riid, void **ppunk);
HRESULT _GetItemType(IShellItem *psi, DWORD *pdwType);
HRESULT _BindToHandlerWithMode(IShellItem *psi, STGXMODE grfMode, REFIID riid, void **ppv);
BOOL _CanHardLink(LPCWSTR pszSourceName, LPCWSTR pszDestName);
HRESULT _CopyStreamHardLink(IShellItem *psiSource, IShellItem *psiDest, LPCWSTR pszName);
HRESULT _CopyStreamBits(IShellItem *psiSource, IShellItem *psiDest);
HRESULT _CopyStreamWithOptions(IShellItem *psiSource, IShellItem *psiDest, LPCWSTR pszName, STGXMOVE grfOptions);
BOOL _HasMultipleStreams(IShellItem *psiItem);
};
STDAPI CreateStg2StgExWrapper(IShellItem *psi, IStorageProcessor *pEngine, ITransferDest **pptd)
{
if (!psi || !pptd)
return E_INVALIDARG;
*pptd = NULL;
CShellItem2TransferDest *pobj = new CShellItem2TransferDest();
if (!pobj)
return E_OUTOFMEMORY;
HRESULT hr = pobj->Init(psi, pEngine);
if (SUCCEEDED(hr))
{
hr = pobj->QueryInterface(IID_PPV_ARG(ITransferDest, pptd));
}
pobj->Release();
return hr;
}
CShellItem2TransferDest::CShellItem2TransferDest() : _cRef(1)
{
}
CShellItem2TransferDest::~CShellItem2TransferDest()
{
if (_psi)
_psi->Release();
if (_pEngine)
_pEngine->Release();
if (_ptas)
_ptas->Release();
}
HRESULT CShellItem2TransferDest::QueryInterface(REFIID riid, void **ppv)
{
static const QITAB qit[] =
{
QITABENT(CShellItem2TransferDest, ITransferDest),
{ 0 },
};
return QISearch(this, qit, riid, ppv);
}
STDMETHODIMP_(ULONG) CShellItem2TransferDest::AddRef()
{
return InterlockedIncrement((LONG *)&_cRef);
}
STDMETHODIMP_(ULONG) CShellItem2TransferDest::Release()
{
if (InterlockedDecrement((LONG *)&_cRef))
return _cRef;
delete this;
return 0;
}
BOOL _IsWebfolders(IShellItem *psi);
STDMETHODIMP CShellItem2TransferDest::Init(IShellItem *psi, IStorageProcessor *pEngine)
{
if (!psi)
return E_INVALIDARG;
if (_psi)
return E_FAIL;
_psi = psi;
_psi->AddRef();
_fWebFolders = _IsWebfolders(_psi);
if (pEngine)
{
_pEngine = pEngine;
_pEngine->AddRef();
}
return S_OK;
}
// ITransferDest
STDMETHODIMP CShellItem2TransferDest::Advise(ITransferAdviseSink *pAdvise, DWORD *pdwCookie)
{
if (!pAdvise || !pdwCookie)
return E_INVALIDARG;
if (_ptas)
return E_FAIL;
_ptas = pAdvise;
*pdwCookie = 1;
_ptas->AddRef();
return S_OK;
}
STDMETHODIMP CShellItem2TransferDest::Unadvise(DWORD dwCookie)
{
if (dwCookie != 1)
return E_INVALIDARG;
ATOMICRELEASE(_ptas);
return S_OK;
}
HRESULT CShellItem2TransferDest::_GetItemType(IShellItem *psi, DWORD *pdwType)
{
*pdwType = STGX_TYPE_ANY;
SFGAOF flags = SFGAO_STORAGE | SFGAO_STREAM;
if (SUCCEEDED(psi->GetAttributes(flags, &flags)) && (flags & (SFGAO_STORAGE | SFGAO_STREAM)))
*pdwType = flags & SFGAO_STREAM ? STGX_TYPE_STREAM : STGX_TYPE_STORAGE;
return S_OK;
}
HRESULT CShellItem2TransferDest::_OpenHelper(const WCHAR *pwcsName, DWORD grfMode, DWORD *pdwType, REFIID riid, void **ppunk)
{
*ppunk = NULL;
IShellItem *psiTemp = NULL;
HRESULT hr = SHCreateShellItemFromParent(_psi, pwcsName, &psiTemp);
if (SUCCEEDED(hr))
{
// make sure this actually exists
SFGAOF flags = SFGAO_VALIDATE;
hr = psiTemp->GetAttributes(flags, &flags);
}
if (SUCCEEDED(hr))
{
DWORD dwTemp;
if (!pdwType)
pdwType = &dwTemp;
_GetItemType(psiTemp, pdwType);
hr = psiTemp->QueryInterface(riid, ppunk);
if (FAILED(hr))
{
hr = _BindToHandlerWithMode(psiTemp, grfMode, riid, ppunk);
if (FAILED(hr) && IsEqualIID(riid, IID_ITransferDest) && *pdwType == STGX_TYPE_STORAGE)
hr = CreateStg2StgExWrapper(psiTemp, _pEngine, (ITransferDest**)ppunk);
}
}
if (psiTemp)
psiTemp->Release();
return hr;
}
HRESULT CShellItem2TransferDest::_CreateHelper(const WCHAR *pwcsName, DWORD grfMode, DWORD dwType, REFIID riid, void **ppunk)
{
*ppunk = NULL;
IStorage *pstg;
HRESULT hr = _BindToHandlerWithMode(_psi, grfMode, IID_PPV_ARG(IStorage, &pstg));
if (SUCCEEDED(hr))
{
if (STGX_TYPE_STORAGE == dwType)
{
IStorage *pstgTemp;
hr = pstg->CreateStorage(pwcsName, grfMode, 0, 0, &pstgTemp);
if (SUCCEEDED(hr))
{
hr = pstgTemp->Commit(STGC_DEFAULT);
if (SUCCEEDED(hr))
{
hr = pstgTemp->QueryInterface(riid, ppunk);
ATOMICRELEASE(pstgTemp); //need to close first in case someone has exclusive lock. Do we need to worry about delete on release?
if (FAILED(hr))
hr = _OpenHelper(pwcsName, grfMode, &dwType, riid, ppunk);
}
if (pstgTemp)
pstgTemp->Release();
}
}
else if (STGX_TYPE_STREAM == dwType)
{
IStream *pstm;
hr = pstg->CreateStream(pwcsName, grfMode, 0, 0, &pstm);
if (SUCCEEDED(hr))
{
hr = pstm->Commit(STGC_DEFAULT);
if (SUCCEEDED(hr))
{
hr = pstm->QueryInterface(riid, ppunk);
ATOMICRELEASE(pstm); //need to close first in case someone has exclusive lock. Do we need to worry about delete on release?
if (FAILED(hr))
hr = _OpenHelper(pwcsName, grfMode, &dwType, riid, ppunk);
}
if (pstm)
pstm->Release();
}
}
pstg->Release();
}
return hr;
}
STDMETHODIMP CShellItem2TransferDest::OpenElement(const WCHAR *pwcsName, STGXMODE grfMode, DWORD *pdwType, REFIID riid, void **ppunk)
{
if (!pwcsName || !pdwType || !ppunk)
return E_INVALIDARG;
if (!_psi)
return E_FAIL;
DWORD dwFlags = grfMode & ~(STGX_MODE_CREATIONMASK);
return _OpenHelper(pwcsName, dwFlags, pdwType, riid, ppunk);
}
STDMETHODIMP CShellItem2TransferDest::CreateElement(const WCHAR *pwcsName, IShellItem *psiTemplate, STGXMODE grfMode, DWORD dwType, REFIID riid, void **ppunk)
{
if (!ppunk)
return E_INVALIDARG;
*ppunk = NULL;
if (!pwcsName)
return E_INVALIDARG;
if (!_psi)
return E_FAIL;
DWORD dwFlags = grfMode & ~(STGX_MODE_CREATIONMASK);
DWORD dwExistingType = STGX_TYPE_ANY;
IShellItem *psi;
HRESULT hr = _OpenHelper(pwcsName, dwFlags, &dwExistingType, IID_PPV_ARG(IShellItem, &psi));
if (grfMode & STGX_MODE_FAILIFTHERE)
dwFlags |= STGM_FAILIFTHERE;
else
dwFlags |= STGM_CREATE;
if (SUCCEEDED(hr))
{
if (grfMode & STGX_MODE_OPENEXISTING)
{
ATOMICRELEASE(psi);
hr = _OpenHelper(pwcsName, dwFlags, &dwType, riid, ppunk);
if (FAILED(hr))
hr = STGX_E_INCORRECTTYPE;
}
else if (grfMode & STGX_MODE_FAILIFTHERE)
{
hr = STG_E_FILEALREADYEXISTS;
}
else
{
// release the open handle on the element
ATOMICRELEASE(psi);
// destroy the element
DestroyElement(pwcsName, grfMode & STGX_MODE_FORCE ? STGX_DESTROY_FORCE : 0);
// dont keep hr from destroyelement because in certain storages (mergedfolder
// for cd burning) the destroy will try to delete the one on the cd, that'll
// fail, but the create will still succeed in the staging area. at this point
// we're already committed to overwriting the element so if _CreateHelper can
// succeed with the STGM_CREATE flag if destroy fails, then more power to it.
hr = _CreateHelper(pwcsName, dwFlags, dwType, riid, ppunk);
}
if (psi)
psi->Release();
}
else
{
hr = _CreateHelper(pwcsName, dwFlags, dwType, riid, ppunk);
}
return hr;
}
HRESULT CShellItem2TransferDest::_BindToHandlerWithMode(IShellItem *psi, STGXMODE grfMode, REFIID riid, void **ppv)
{
IBindCtx *pbc;
HRESULT hr = BindCtx_CreateWithMode(grfMode, &pbc); // need to translate mode flags?
if (SUCCEEDED(hr))
{
GUID bhid;
if (IsEqualGUID(riid, IID_IStorage))
bhid = BHID_Storage;
else if (IsEqualGUID(riid, IID_IStream))
bhid = BHID_Stream;
else
bhid = BHID_SFObject;
hr = psi->BindToHandler(pbc, bhid, riid, ppv);
pbc->Release();
}
return hr;
}
#define NT_FAILED(x) NT_ERROR(x) // More consistent name for this macro
BOOL CShellItem2TransferDest::_HasMultipleStreams(IShellItem *psiItem)
{
BOOL fReturn = FALSE;
LPWSTR pszPath;
if (SUCCEEDED(psiItem->GetDisplayName(SIGDN_FILESYSPATH, &pszPath)))
{
DWORD dwType;
_GetItemType(psiItem, &dwType);
BOOL fIsADir = (STGX_TYPE_STORAGE == dwType);
// Covert the conventional paths to UnicodePath descriptors
UNICODE_STRING UnicodeSrcObject;
RtlInitUnicodeString(&UnicodeSrcObject, pszPath);
if (RtlDosPathNameToNtPathName_U(pszPath, &UnicodeSrcObject, NULL, NULL))
{
// Build an NT object descriptor from the UnicodeSrcObject
OBJECT_ATTRIBUTES SrcObjectAttributes;
InitializeObjectAttributes(&SrcObjectAttributes, &UnicodeSrcObject, OBJ_CASE_INSENSITIVE, NULL, NULL);
// Open the file for generic read, and the dest path for attribute read
IO_STATUS_BLOCK IoStatusBlock;
HANDLE SrcObjectHandle = INVALID_HANDLE_VALUE;
NTSTATUS NtStatus = NtOpenFile(&SrcObjectHandle, FILE_GENERIC_READ, &SrcObjectAttributes,
&IoStatusBlock, FILE_SHARE_READ, (fIsADir ? FILE_DIRECTORY_FILE : FILE_NON_DIRECTORY_FILE));
if (NT_SUCCESS(NtStatus))
{
// pAttributeInfo will point to enough stack to hold the
// FILE_FS_ATTRIBUTE_INFORMATION and worst-case filesystem name
size_t cbAttributeInfo = sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + MAX_PATH * sizeof(TCHAR);
PFILE_FS_ATTRIBUTE_INFORMATION pAttributeInfo = (PFILE_FS_ATTRIBUTE_INFORMATION) _alloca(cbAttributeInfo);
NtStatus = NtQueryVolumeInformationFile(
SrcObjectHandle,
&IoStatusBlock,
(BYTE *) pAttributeInfo,
cbAttributeInfo,
FileFsAttributeInformation
);
if (NT_SUCCESS(NtStatus))
{
// If the source filesystem isn't NTFS, we can just bail now
pAttributeInfo->FileSystemName[ (pAttributeInfo->FileSystemNameLength / sizeof(WCHAR)) ] = L'\0';
if (0 != StrStrIW(pAttributeInfo->FileSystemName, L"NTFS"))
{
// Incrementally try allocation sizes for the ObjectStreamInformation,
// then retrieve the actual stream info
size_t cbBuffer = sizeof(FILE_STREAM_INFORMATION) + MAX_PATH * sizeof(WCHAR);
BYTE *pBuffer = (BYTE *) LocalAlloc(LPTR, cbBuffer);
if (pBuffer)
{
NtStatus = STATUS_BUFFER_OVERFLOW;
while (STATUS_BUFFER_OVERFLOW == NtStatus)
{
BYTE * pOldBuffer = pBuffer;
pBuffer = (BYTE *) LocalReAlloc(pBuffer, cbBuffer, LMEM_MOVEABLE);
if (NULL == pBuffer)
{
pBuffer = pOldBuffer; //we will free it at the end of the function
break;
}
NtStatus = NtQueryInformationFile(SrcObjectHandle, &IoStatusBlock, pBuffer, cbBuffer, FileStreamInformation);
cbBuffer *= 2;
}
if (NT_SUCCESS(NtStatus))
{
FILE_STREAM_INFORMATION * pStreamInfo = (FILE_STREAM_INFORMATION *) pBuffer;
if (fIsADir)
{
// From experimentation, it seems that if there's only one stream on a directory and
// it has a zero-length name, its a vanilla directory
fReturn = ((0 != pStreamInfo->NextEntryOffset) && (0 == pStreamInfo->StreamNameLength));
}
else // File
{
// Single stream only if first stream has no next offset
fReturn = ((0 != pStreamInfo->NextEntryOffset) && (pBuffer == (BYTE *) pStreamInfo));
}
}
LocalFree(pBuffer);
}
}
}
NtClose(SrcObjectHandle);
}
RtlFreeHeap(RtlProcessHeap(), 0, UnicodeSrcObject.Buffer);
}
CoTaskMemFree(pszPath);
}
return fReturn;
}
// needs to implement new name functionality
STDMETHODIMP CShellItem2TransferDest::MoveElement(IShellItem *psiItem, WCHAR *pwcsNewName, STGXMOVE grfOptions)
{
if (!psiItem)
return E_INVALIDARG;
if (!_psi)
return E_FAIL;
HRESULT hr = STRESPONSE_CONTINUE;
DWORD dwType;
_GetItemType(psiItem, &dwType);
if (_HasMultipleStreams(psiItem) && _ptas)
{
hr = _ptas->ConfirmOperation(psiItem, NULL, (STGX_TYPE_STORAGE == dwType) ? STCONFIRM_STREAM_LOSS_STORAGE : STCONFIRM_STREAM_LOSS_STREAM, NULL);
}
if (STRESPONSE_CONTINUE == hr)
{
LPWSTR pszOldName;
hr = psiItem->GetDisplayName(SIGDN_PARENTRELATIVEFORADDRESSBAR, &pszOldName);
if (SUCCEEDED(hr))
{
// we want to merge folders and replace files
STGXMODE grfMode = STGX_TYPE_STORAGE == dwType ? STGX_MODE_WRITE | STGX_MODE_OPENEXISTING : STGX_MODE_WRITE | STGX_MODE_FAILIFTHERE;
LPWSTR pszName = pwcsNewName ? pwcsNewName : pszOldName;
BOOL fRepeat;
do
{
fRepeat = FALSE;
IShellItem *psiTarget;
hr = CreateElement(pszName, psiItem, grfMode, dwType, IID_PPV_ARG(IShellItem, &psiTarget));
if (SUCCEEDED(hr))
{
if (STGX_TYPE_STORAGE == dwType)
{
if (!(grfOptions & STGX_MOVE_NORECURSION))
{
if (_pEngine)
{
IEnumShellItems *penum;
hr = psiItem->BindToHandler(NULL, BHID_StorageEnum, IID_PPV_ARG(IEnumShellItems, &penum));
if (SUCCEEDED(hr))
{
STGOP stgop;
if (grfOptions & STGX_MOVE_PREFERHARDLINK)
{
stgop = STGOP_COPY_PREFERHARDLINK;
}
else
{
stgop = (grfOptions & STGX_MOVE_COPY) ? STGOP_COPY : STGOP_MOVE;
}
hr = _pEngine->Run(penum, psiTarget, stgop, STOPT_NOSTATS);
penum->Release();
}
}
else
{
hr = STGX_E_CANNOTRECURSE;
}
}
}
else if (STGX_TYPE_STREAM == dwType)
{
// this one is easy, create the destination stream and then call our stream copy helper function
// Use the stream copy helper that gives us progress
hr = _CopyStreamWithOptions(psiItem, psiTarget, pszName, grfOptions);
}
else
{
hr = E_FAIL;
}
}
if (SUCCEEDED(hr) && !(grfOptions & STGX_MOVE_COPY))
{
// in order to do a move we "copy" and then "delete"
IShellItem *psiSource;
hr = psiItem->GetParent(&psiSource);
if (SUCCEEDED(hr))
{
IStorage *pstgSource;
hr = _BindToHandlerWithMode(psiSource, STGX_MODE_WRITE, IID_PPV_ARG(IStorage, &pstgSource));
if (SUCCEEDED(hr))
{
hr = pstgSource->DestroyElement(pszName);
pstgSource->Release();
}
psiSource->Release();
}
}
if (FAILED(hr) && _ptas)
{
HRESULT hrConfirm = E_FAIL;
CUSTOMCONFIRMATION cc = {sizeof(cc)};
STGTRANSCONFIRMATION stc = GUID_NULL;
UINT idDesc = 0, idTitle = 0;
BOOL fConfirm = FALSE;
switch (hr)
{
case STG_E_FILEALREADYEXISTS:
ASSERT(STGX_TYPE_STREAM == dwType);
hrConfirm = _OpenHelper(pszName, STGX_MODE_READ, NULL, IID_PPV_ARG(IShellItem, &psiTarget));
if (SUCCEEDED(hrConfirm))
{
hrConfirm = _ptas->ConfirmOperation(psiItem, psiTarget, STCONFIRM_REPLACE_STREAM, NULL);
}
break;
case STRESPONSE_CANCEL:
break;
case STG_E_MEDIUMFULL:
fConfirm = TRUE;
cc.dwButtons = CCB_OK;
idDesc = IDS_REASONS_NODISKSPACE;
break;
// this is just for CD burning case
case HRESULT_FROM_WIN32(E_ACCESSDENIED):
case STG_E_ACCESSDENIED:
stc = STCONFIRM_ACCESS_DENIED;
// fall through, so that we can have some kind of error in non CD case
default:
fConfirm = TRUE;
cc.dwFlags |= CCF_SHOW_SOURCE_INFO;
cc.dwButtons = CCB_RETRY_SKIP_CANCEL;
idTitle = (grfOptions & STGX_MOVE_COPY ? IDS_UNKNOWN_COPY_TITLE : IDS_UNKNOWN_MOVE_TITLE);
if (STGX_TYPE_STORAGE == dwType)
{
if (grfOptions & STGX_MOVE_COPY)
{
idDesc = IDS_UNKNOWN_COPY_FOLDER;
}
else
{
idDesc = IDS_UNKNOWN_MOVE_FOLDER;
}
}
else
{
if (grfOptions & STGX_MOVE_COPY)
{
idDesc = IDS_UNKNOWN_COPY_FILE;
}
else
{
idDesc = IDS_UNKNOWN_MOVE_FILE;
}
}
break;
}
if (fConfirm)
{
if (idTitle == 0)
idTitle = IDS_DEFAULTTITLE;
ASSERT(idDesc != 0);
cc.pwszDescription = ResourceCStrToStr(g_hinst, (LPCWSTR)(UINT_PTR)idDesc);
if (cc.pwszDescription)
{
cc.pwszTitle = ResourceCStrToStr(g_hinst, (LPCWSTR)(UINT_PTR)idTitle);
if (cc.pwszTitle)
{
cc.dwFlags |= CCF_USE_DEFAULT_ICON;
hrConfirm = _ptas->ConfirmOperation(psiItem, psiTarget, stc, &cc);
LocalFree(cc.pwszTitle);
}
LocalFree(cc.pwszDescription);
}
}
switch (hrConfirm)
{
case STRESPONSE_CONTINUE:
case STRESPONSE_RETRY:
if (STRESPONSE_RETRY == hrConfirm || STG_E_FILEALREADYEXISTS == hr)
{
grfMode = STGX_MODE_WRITE | STGX_MODE_FORCE;
fRepeat = TRUE;
}
break;
case STRESPONSE_SKIP:
hr = S_FALSE;
break;
default:
// let hr propagate out of the function
break;
}
}
if (psiTarget)
psiTarget->Release();
}
while (fRepeat);
CoTaskMemFree(pszOldName);
}
}
return hr;
}
STDMETHODIMP CShellItem2TransferDest::DestroyElement(const WCHAR *pwcsName, STGXDESTROY grfOptions)
{
if (!_psi)
return E_FAIL;
// TODO: Pre and post op, confirmations
HRESULT hr = STRESPONSE_CONTINUE;
if (!(grfOptions & STGX_DESTROY_FORCE) && _ptas)
{
DWORD dwType = STGX_TYPE_ANY;
IShellItem *psi;
hr = _OpenHelper(pwcsName, STGX_MODE_READ, &dwType, IID_PPV_ARG(IShellItem, &psi));
if (SUCCEEDED(hr))
{
hr = _ptas->ConfirmOperation(psi, NULL,
(STGX_TYPE_STORAGE == dwType) ? STCONFIRM_DELETE_STORAGE : STCONFIRM_DELETE_STREAM,
NULL);
psi->Release();
}
}
if (STRESPONSE_CONTINUE == hr)
{
IStorage *pstg;
hr = _BindToHandlerWithMode(_psi, STGX_MODE_WRITE, IID_PPV_ARG(IStorage, &pstg));
if (SUCCEEDED(hr))
{
hr = pstg->DestroyElement(pwcsName);
pstg->Release();
}
}
return hr;
}
STDMETHODIMP CShellItem2TransferDest::RenameElement(const WCHAR *pwcsOldName, const WCHAR *pwcsNewName)
{
if (!_psi)
return E_FAIL;
// TODO: Pre and post op, confirmations
IStorage *pstg;
HRESULT hr = _BindToHandlerWithMode(_psi, STGX_MODE_WRITE, IID_PPV_ARG(IStorage, &pstg));
if (SUCCEEDED(hr))
{
hr = pstg->RenameElement(pwcsOldName, pwcsNewName);
pstg->Release();
}
return hr;
}
STDAPI_(BOOL) IsFileDeletable(LPCTSTR pszFile); // bitbuck.c
BOOL CShellItem2TransferDest::_CanHardLink(LPCWSTR pszSourceName, LPCWSTR pszDestName)
{
// this is not intended to catch invalid situations where we could be hard linking --
// CreateHardLink already takes care of all removable media, non-NTFS, etc.
// this is just to do a quick check before taking the cost of destroying and
// recreating the file.
// unfortunately due to architecture cleanliness we can't keep state of whether hard
// links are possible for the whole copy, so we check on each element.
BOOL fRet = FALSE;
if (PathGetDriveNumber(pszSourceName) == PathGetDriveNumber(pszDestName))
{
TCHAR szRoot[MAX_PATH];
lstrcpyn(szRoot, pszSourceName, ARRAYSIZE(szRoot));
TCHAR szFileSystem[20];
if (PathStripToRoot(szRoot) &&
GetVolumeInformation(szRoot, NULL, 0, NULL, NULL, NULL, szFileSystem, ARRAYSIZE(szFileSystem)))
{
if (lstrcmpi(szFileSystem, TEXT("NTFS")) == 0)
{
// check if we have delete access on the file. this will aid the user later
// if they want to manage the files in the staging area for cd burning.
// if not, then make a normal copy.
if (IsFileDeletable(pszSourceName))
{
fRet = TRUE;
}
}
}
}
return fRet;
}
HRESULT CShellItem2TransferDest::_CopyStreamHardLink(IShellItem *psiSource, IShellItem *psiDest, LPCWSTR pszName)
{
// sell out and go to filesystem
LPWSTR pszSourceName;
HRESULT hr = psiSource->GetDisplayName(SIGDN_FILESYSPATH, &pszSourceName);
if (SUCCEEDED(hr))
{
LPWSTR pszDestName;
hr = psiDest->GetDisplayName(SIGDN_FILESYSPATH, &pszDestName);
if (SUCCEEDED(hr))
{
if (_CanHardLink(pszSourceName, pszDestName))
{
// need to destroy the 0-byte file we created during our confirm overwrite probing
DestroyElement(pszName, STGX_DESTROY_FORCE);
hr = CreateHardLink(pszDestName, pszSourceName, NULL) ? S_OK : E_FAIL;
if (SUCCEEDED(hr))
{
SHChangeNotify(SHCNE_CREATE, SHCNF_PATH, pszDestName, NULL);
_ptas->OperationProgress(STGOP_COPY, psiSource, psiDest, 1, 1);
}
else
{
// we deleted it above and need to recreate it for the fallback of doing a normal copy
IUnknown *punkDummy;
if (SUCCEEDED(_CreateHelper(pszName, STGX_MODE_WRITE | STGX_MODE_FORCE, STGX_TYPE_STREAM, IID_PPV_ARG(IUnknown, &punkDummy))))
{
punkDummy->Release();
}
}
}
else
{
hr = E_FAIL;
}
CoTaskMemFree(pszDestName);
}
CoTaskMemFree(pszSourceName);
}
return hr;
}
HRESULT CShellItem2TransferDest::_CopyStreamWithOptions(IShellItem *psiSource, IShellItem *psiDest, LPCWSTR pszName, STGXMOVE grfOptions)
{
HRESULT hr = E_FAIL;
if (grfOptions & STGX_MOVE_PREFERHARDLINK)
{
hr = _CopyStreamHardLink(psiSource, psiDest, pszName);
}
if (FAILED(hr))
{
hr = _CopyStreamBits(psiSource, psiDest);
}
return hr;
}
HRESULT CShellItem2TransferDest::_CopyStreamBits(IShellItem *psiSource, IShellItem *psiDest)
{
const ULONG maxbuf = 1024*1024; // max size we will ever use for a buffer
const ULONG minbuf = 1024; // smallest buffer we will use
void *pv = LocalAlloc(LPTR, minbuf);
if (!pv)
return E_OUTOFMEMORY;
IStream *pstrmSource;
HRESULT hr = _BindToHandlerWithMode(psiSource, STGM_READ | STGM_SHARE_DENY_WRITE, IID_PPV_ARG(IStream, &pstrmSource));
if (SUCCEEDED(hr))
{
IStream *pstrmDest;
hr = _BindToHandlerWithMode(psiDest, STGM_READWRITE, IID_PPV_ARG(IStream, &pstrmDest));
if (SUCCEEDED(hr))
{
// we need the source size info so we can show progress
STATSTG statsrc;
hr = pstrmSource->Stat(&statsrc, STATFLAG_NONAME);
if (SUCCEEDED(hr))
{
ULONG cbSizeToAlloc = minbuf;
ULONG cbSizeAlloced = 0;
ULONG cbToRead = 0;
ULONGLONG ullCurr = 0;
const ULONG maxms = 2500; // max time, in ms, we'd like between progress updates
const ULONG minms = 750; // min time we'd like to be doing work between updates
cbSizeAlloced = cbSizeToAlloc;
cbToRead = cbSizeAlloced;
DWORD dwmsBefore = GetTickCount();
// Read from source, write to dest, and update progress. We start doing 1K at a time, and
// so long as its taking us less than (minms) milliseconds per pass, we'll double the buffer
// size. If we go longer than (maxms) milliseconds, we'll cut our work in half.
ULONG cbRead;
ULONGLONG ullCur = 0;
while (SUCCEEDED(hr = pstrmSource->Read(pv, cbToRead, &cbRead)) && cbRead)
{
// Update the progress based on the bytes read so far
ullCur += cbRead;
hr = _ptas->OperationProgress(STGOP_COPY, psiSource, psiDest, statsrc.cbSize.QuadPart, ullCur);
if (FAILED(hr))
break;
// Write the bytes to the output stream
ULONG cbWritten = 0;
hr = pstrmDest->Write(pv, cbRead, &cbWritten);
if (FAILED(hr))
break;
DWORD dwmsAfter = GetTickCount();
// If we're going to fast or too slow, adjust the size of the buffer. If we paused for user
// intervention we'll think we're slow, but we'll correct next pass
if (dwmsAfter - dwmsBefore < minms && cbSizeAlloced < maxbuf)
{
// We completed really quickly, so we should try to do more work next time.
// Try to grow the buffer. If it fails, just go with the existing buffer.
if (cbToRead < cbSizeAlloced)
{
// Buffer already larger than work we're doing, so just bump up scheduled work
cbToRead = __min(cbToRead *2, cbSizeAlloced);
}
else
{
// Buffer maxed by current scheduled work, so increase its size
void *pvOld = pv;
cbSizeToAlloc = __min(cbSizeAlloced *2, maxbuf);
pv = LocalReAlloc((HLOCAL)pv, cbSizeToAlloc, LPTR);
if (!pv)
pv = pvOld; // Old pointer still valid
else
cbSizeAlloced = cbSizeToAlloc;
cbToRead = cbSizeAlloced;
}
}
else if (dwmsAfter - dwmsBefore > maxms && cbToRead > minbuf)
{
cbToRead = __max(cbToRead / 2, minbuf);
}
dwmsBefore = GetTickCount();
}
}
if (SUCCEEDED(hr))
hr = pstrmDest->Commit(STGC_DEFAULT);
pstrmDest->Release();
}
pstrmSource->Release();
}
LocalFree(pv);
// eventually we will read to the end of the file and get an S_FALSE, return S_OK
if (S_FALSE == hr)
{
hr = S_OK;
}
return hr;
}
Reference in a new issue Copy permalink