reactos/dll/win32/ole32/filelockbytes.c

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/******************************************************************************
*
* File-based ILockBytes implementation
*
* Copyright 1999 Thuy Nguyen
* Copyright 2010 Vincent Povirk for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#define COBJMACROS
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "winerror.h"
#include "objbase.h"
#include "ole2.h"
#include "storage32.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(storage);
typedef struct FileLockBytesImpl
{
ILockBytes ILockBytes_iface;
LONG ref;
HANDLE hfile;
DWORD flProtect;
LPWSTR pwcsName;
} FileLockBytesImpl;
static const ILockBytesVtbl FileLockBytesImpl_Vtbl;
static inline FileLockBytesImpl *impl_from_ILockBytes(ILockBytes *iface)
{
return CONTAINING_RECORD(iface, FileLockBytesImpl, ILockBytes_iface);
}
/***********************************************************
* Prototypes for private methods
*/
/****************************************************************************
* GetProtectMode
*
* This function will return a protection mode flag for a file-mapping object
* from the open flags of a file.
*/
static DWORD GetProtectMode(DWORD openFlags)
{
switch(STGM_ACCESS_MODE(openFlags))
{
case STGM_WRITE:
case STGM_READWRITE:
return PAGE_READWRITE;
}
return PAGE_READONLY;
}
/******************************************************************************
* FileLockBytesImpl_Construct
*
* Initialize a big block object supported by a file.
*/
HRESULT FileLockBytesImpl_Construct(HANDLE hFile, DWORD openFlags, LPCWSTR pwcsName, ILockBytes **pLockBytes)
{
FileLockBytesImpl *This;
WCHAR fullpath[MAX_PATH];
if (hFile == INVALID_HANDLE_VALUE)
return E_FAIL;
This = HeapAlloc(GetProcessHeap(), 0, sizeof(FileLockBytesImpl));
if (!This)
return E_OUTOFMEMORY;
This->ILockBytes_iface.lpVtbl = &FileLockBytesImpl_Vtbl;
This->ref = 1;
This->hfile = hFile;
This->flProtect = GetProtectMode(openFlags);
if(pwcsName) {
if (!GetFullPathNameW(pwcsName, MAX_PATH, fullpath, NULL))
{
lstrcpynW(fullpath, pwcsName, MAX_PATH);
}
This->pwcsName = HeapAlloc(GetProcessHeap(), 0,
(lstrlenW(fullpath)+1)*sizeof(WCHAR));
if (!This->pwcsName)
{
HeapFree(GetProcessHeap(), 0, This);
return E_OUTOFMEMORY;
}
lstrcpyW(This->pwcsName, fullpath);
}
else
This->pwcsName = NULL;
*pLockBytes = &This->ILockBytes_iface;
return S_OK;
}
/* ILockByte Interfaces */
static HRESULT WINAPI FileLockBytesImpl_QueryInterface(ILockBytes *iface, REFIID riid,
void **ppvObject)
{
if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_ILockBytes))
*ppvObject = iface;
else
{
*ppvObject = NULL;
return E_NOINTERFACE;
}
IUnknown_AddRef((IUnknown*)*ppvObject);
return S_OK;
}
static ULONG WINAPI FileLockBytesImpl_AddRef(ILockBytes *iface)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
return InterlockedIncrement(&This->ref);
}
static ULONG WINAPI FileLockBytesImpl_Release(ILockBytes *iface)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
ULONG ref;
ref = InterlockedDecrement(&This->ref);
if (ref == 0)
{
CloseHandle(This->hfile);
HeapFree(GetProcessHeap(), 0, This->pwcsName);
HeapFree(GetProcessHeap(), 0, This);
}
return ref;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* It reads a block of information from the byte array at the specified
* offset.
*
* See the documentation of ILockBytes for more info.
*/
static HRESULT WINAPI FileLockBytesImpl_ReadAt(
ILockBytes* iface,
ULARGE_INTEGER ulOffset, /* [in] */
void* pv, /* [length_is][size_is][out] */
ULONG cb, /* [in] */
ULONG* pcbRead) /* [out] */
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
ULONG bytes_left = cb;
LPBYTE readPtr = pv;
BOOL ret;
LARGE_INTEGER offset;
ULONG cbRead;
TRACE("(%p)-> %i %p %i %p\n",This, ulOffset.u.LowPart, pv, cb, pcbRead);
/* verify a sane environment */
if (!This) return E_FAIL;
if (pcbRead)
*pcbRead = 0;
offset.QuadPart = ulOffset.QuadPart;
ret = SetFilePointerEx(This->hfile, offset, NULL, FILE_BEGIN);
if (!ret)
return STG_E_READFAULT;
while (bytes_left)
{
ret = ReadFile(This->hfile, readPtr, bytes_left, &cbRead, NULL);
if (!ret || cbRead == 0)
return STG_E_READFAULT;
if (pcbRead)
*pcbRead += cbRead;
bytes_left -= cbRead;
readPtr += cbRead;
}
TRACE("finished\n");
return S_OK;
}
/******************************************************************************
* This method is part of the ILockBytes interface.
*
* It writes the specified bytes at the specified offset.
* position. If the file is too small, it will be resized.
*
* See the documentation of ILockBytes for more info.
*/
static HRESULT WINAPI FileLockBytesImpl_WriteAt(
ILockBytes* iface,
ULARGE_INTEGER ulOffset, /* [in] */
const void* pv, /* [size_is][in] */
ULONG cb, /* [in] */
ULONG* pcbWritten) /* [out] */
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
ULONG bytes_left = cb;
const BYTE *writePtr = pv;
BOOL ret;
LARGE_INTEGER offset;
ULONG cbWritten;
TRACE("(%p)-> %i %p %i %p\n",This, ulOffset.u.LowPart, pv, cb, pcbWritten);
/* verify a sane environment */
if (!This) return E_FAIL;
if (This->flProtect != PAGE_READWRITE)
return STG_E_ACCESSDENIED;
if (pcbWritten)
*pcbWritten = 0;
offset.QuadPart = ulOffset.QuadPart;
ret = SetFilePointerEx(This->hfile, offset, NULL, FILE_BEGIN);
if (!ret)
return STG_E_WRITEFAULT;
while (bytes_left)
{
ret = WriteFile(This->hfile, writePtr, bytes_left, &cbWritten, NULL);
if (!ret)
return STG_E_WRITEFAULT;
if (pcbWritten)
*pcbWritten += cbWritten;
bytes_left -= cbWritten;
writePtr += cbWritten;
}
TRACE("finished\n");
return S_OK;
}
static HRESULT WINAPI FileLockBytesImpl_Flush(ILockBytes* iface)
{
return S_OK;
}
/******************************************************************************
* ILockBytes_SetSize
*
* Sets the size of the file.
*
*/
static HRESULT WINAPI FileLockBytesImpl_SetSize(ILockBytes* iface, ULARGE_INTEGER newSize)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
HRESULT hr = S_OK;
LARGE_INTEGER newpos;
TRACE("new size %u\n", newSize.u.LowPart);
newpos.QuadPart = newSize.QuadPart;
if (SetFilePointerEx(This->hfile, newpos, NULL, FILE_BEGIN))
{
SetEndOfFile(This->hfile);
}
return hr;
}
static HRESULT get_lock_error(void)
{
switch (GetLastError())
{
case ERROR_LOCK_VIOLATION: return STG_E_LOCKVIOLATION; break;
case ERROR_ACCESS_DENIED: return STG_E_ACCESSDENIED; break;
case ERROR_NOT_SUPPORTED: return STG_E_INVALIDFUNCTION; break;
default:
FIXME("no mapping for error %d\n", GetLastError());
return STG_E_INVALIDFUNCTION;
}
}
static HRESULT WINAPI FileLockBytesImpl_LockRegion(ILockBytes* iface,
ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
OVERLAPPED ol;
DWORD lock_flags = LOCKFILE_FAIL_IMMEDIATELY;
TRACE("ofs %u count %u flags %x\n", libOffset.u.LowPart, cb.u.LowPart, dwLockType);
if (dwLockType & LOCK_WRITE)
return STG_E_INVALIDFUNCTION;
if (dwLockType & (LOCK_EXCLUSIVE|LOCK_ONLYONCE))
lock_flags |= LOCKFILE_EXCLUSIVE_LOCK;
ol.hEvent = 0;
ol.u.s.Offset = libOffset.u.LowPart;
ol.u.s.OffsetHigh = libOffset.u.HighPart;
if (LockFileEx(This->hfile, lock_flags, 0, cb.u.LowPart, cb.u.HighPart, &ol))
return S_OK;
return get_lock_error();
}
static HRESULT WINAPI FileLockBytesImpl_UnlockRegion(ILockBytes* iface,
ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
OVERLAPPED ol;
TRACE("ofs %u count %u flags %x\n", libOffset.u.LowPart, cb.u.LowPart, dwLockType);
if (dwLockType & LOCK_WRITE)
return STG_E_INVALIDFUNCTION;
ol.hEvent = 0;
ol.u.s.Offset = libOffset.u.LowPart;
ol.u.s.OffsetHigh = libOffset.u.HighPart;
if (UnlockFileEx(This->hfile, 0, cb.u.LowPart, cb.u.HighPart, &ol))
return S_OK;
return get_lock_error();
}
static HRESULT WINAPI FileLockBytesImpl_Stat(ILockBytes* iface,
STATSTG *pstatstg, DWORD grfStatFlag)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
if (!(STATFLAG_NONAME & grfStatFlag) && This->pwcsName)
{
pstatstg->pwcsName =
CoTaskMemAlloc((lstrlenW(This->pwcsName)+1)*sizeof(WCHAR));
lstrcpyW(pstatstg->pwcsName, This->pwcsName);
}
else
pstatstg->pwcsName = NULL;
pstatstg->type = STGTY_LOCKBYTES;
pstatstg->cbSize.u.LowPart = GetFileSize(This->hfile, &pstatstg->cbSize.u.HighPart);
/* FIXME: If the implementation is exported, we'll need to set other fields. */
pstatstg->grfLocksSupported = LOCK_EXCLUSIVE|LOCK_ONLYONCE|WINE_LOCK_READ;
return S_OK;
}
static const ILockBytesVtbl FileLockBytesImpl_Vtbl = {
FileLockBytesImpl_QueryInterface,
FileLockBytesImpl_AddRef,
FileLockBytesImpl_Release,
FileLockBytesImpl_ReadAt,
FileLockBytesImpl_WriteAt,
FileLockBytesImpl_Flush,
FileLockBytesImpl_SetSize,
FileLockBytesImpl_LockRegion,
FileLockBytesImpl_UnlockRegion,
FileLockBytesImpl_Stat
};