Sweden-Number/dlls/ole32/filelockbytes.c

352 lines
8.9 KiB
C
Raw Normal View History

/******************************************************************************
*
* 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"
1999-02-28 20:14:33 +01:00
#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
{
const ILockBytesVtbl *lpVtbl;
LONG ref;
ULARGE_INTEGER filesize;
HANDLE hfile;
DWORD flProtect;
} FileLockBytesImpl;
static const ILockBytesVtbl FileLockBytesImpl_Vtbl;
/***********************************************************
* Prototypes for private methods
*/
/* Note that this evaluates a and b multiple times, so don't
* pass expressions with side effects. */
#define ROUND_UP(a, b) ((((a) + (b) - 1)/(b))*(b))
/****************************************************************************
* 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, ILockBytes **pLockBytes)
{
FileLockBytesImpl *This;
if (hFile == INVALID_HANDLE_VALUE)
return E_FAIL;
This = HeapAlloc(GetProcessHeap(), 0, sizeof(FileLockBytesImpl));
if (!This)
return E_OUTOFMEMORY;
This->lpVtbl = &FileLockBytesImpl_Vtbl;
This->ref = 1;
This->hfile = hFile;
This->filesize.u.LowPart = GetFileSize(This->hfile,
&This->filesize.u.HighPart);
This->flProtect = GetProtectMode(openFlags);
TRACE("file len %u\n", This->filesize.u.LowPart);
*pLockBytes = (ILockBytes*)This;
return S_OK;
}
/* ILockByte Interfaces */
static HRESULT WINAPI FileLockBytesImpl_QueryInterface(ILockBytes *iface, REFIID riid,
void **ppvObject)
{
if (IsEqualIID(riid, &IID_ILockBytes) || 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)
1999-02-18 16:55:53 +01:00
{
FileLockBytesImpl* This = (FileLockBytesImpl*)iface;
return InterlockedIncrement(&This->ref);
1999-02-18 16:55:53 +01:00
}
static ULONG WINAPI FileLockBytesImpl_Release(ILockBytes *iface)
{
FileLockBytesImpl* This = (FileLockBytesImpl*)iface;
ULONG ref;
ref = InterlockedDecrement(&This->ref);
if (ref == 0)
{
CloseHandle(This->hfile);
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 = (FileLockBytesImpl*)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);
2007-04-02 19:17:56 +02:00
/* 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 = (FileLockBytesImpl*)iface;
ULONG size_needed = ulOffset.u.LowPart + cb;
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);
2007-04-02 19:17:56 +02:00
/* verify a sane environment */
if (!This) return E_FAIL;
if (This->flProtect != PAGE_READWRITE)
return STG_E_ACCESSDENIED;
if (pcbWritten)
*pcbWritten = 0;
if (size_needed > This->filesize.u.LowPart)
{
ULARGE_INTEGER newSize;
newSize.u.HighPart = 0;
newSize.u.LowPart = size_needed;
ILockBytes_SetSize(iface, newSize);
}
offset.QuadPart = ulOffset.QuadPart;
ret = SetFilePointerEx(This->hfile, offset, NULL, FILE_BEGIN);
if (!ret)
return STG_E_READFAULT;
while (bytes_left)
{
ret = WriteFile(This->hfile, writePtr, bytes_left, &cbWritten, NULL);
if (!ret)
return STG_E_READFAULT;
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 = (FileLockBytesImpl*)iface;
HRESULT hr = S_OK;
LARGE_INTEGER newpos;
if (This->filesize.u.LowPart == newSize.u.LowPart)
return hr;
TRACE("from %u to %u\n", This->filesize.u.LowPart, newSize.u.LowPart);
newpos.QuadPart = newSize.QuadPart;
if (SetFilePointerEx(This->hfile, newpos, NULL, FILE_BEGIN))
{
SetEndOfFile(This->hfile);
}
This->filesize = newSize;
return hr;
}
static HRESULT WINAPI FileLockBytesImpl_LockRegion(ILockBytes* iface,
ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
{
FIXME("stub\n");
return E_NOTIMPL;
}
static HRESULT WINAPI FileLockBytesImpl_UnlockRegion(ILockBytes* iface,
ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
{
FIXME("stub\n");
return E_NOTIMPL;
}
static HRESULT WINAPI FileLockBytesImpl_Stat(ILockBytes* iface,
STATSTG *pstatstg, DWORD grfStatFlag)
{
FileLockBytesImpl* This = (FileLockBytesImpl*)iface;
if (!(STATFLAG_NONAME & grfStatFlag))
{
FIXME("reading filename not supported\n");
}
pstatstg->pwcsName = NULL;
pstatstg->type = STGTY_LOCKBYTES;
pstatstg->cbSize = This->filesize;
/* FIXME: If the implementation is exported, we'll need to set other fields. */
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
};