1 /******************************************************************************
3 * File-based ILockBytes implementation
5 * Copyright 1999 Thuy Nguyen
6 * Copyright 2010 Vincent Povirk for CodeWeavers
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
31 #define NONAMELESSUNION
32 #define NONAMELESSSTRUCT
41 #include "storage32.h"
43 #include "wine/debug.h"
44 #include "wine/unicode.h"
46 WINE_DEFAULT_DEBUG_CHANNEL(storage);
48 typedef struct FileLockBytesImpl
50 ILockBytes ILockBytes_iface;
52 ULARGE_INTEGER filesize;
58 static const ILockBytesVtbl FileLockBytesImpl_Vtbl;
60 static inline FileLockBytesImpl *impl_from_ILockBytes(ILockBytes *iface)
62 return CONTAINING_RECORD(iface, FileLockBytesImpl, ILockBytes_iface);
65 /***********************************************************
66 * Prototypes for private methods
69 /* Note that this evaluates a and b multiple times, so don't
70 * pass expressions with side effects. */
71 #define ROUND_UP(a, b) ((((a) + (b) - 1)/(b))*(b))
73 /****************************************************************************
76 * This function will return a protection mode flag for a file-mapping object
77 * from the open flags of a file.
79 static DWORD GetProtectMode(DWORD openFlags)
81 switch(STGM_ACCESS_MODE(openFlags))
85 return PAGE_READWRITE;
90 /******************************************************************************
91 * FileLockBytesImpl_Construct
93 * Initialize a big block object supported by a file.
95 HRESULT FileLockBytesImpl_Construct(HANDLE hFile, DWORD openFlags, LPCWSTR pwcsName, ILockBytes **pLockBytes)
97 FileLockBytesImpl *This;
98 WCHAR fullpath[MAX_PATH];
100 if (hFile == INVALID_HANDLE_VALUE)
103 This = HeapAlloc(GetProcessHeap(), 0, sizeof(FileLockBytesImpl));
106 return E_OUTOFMEMORY;
108 This->ILockBytes_iface.lpVtbl = &FileLockBytesImpl_Vtbl;
111 This->filesize.u.LowPart = GetFileSize(This->hfile,
112 &This->filesize.u.HighPart);
113 This->flProtect = GetProtectMode(openFlags);
116 if (!GetFullPathNameW(pwcsName, MAX_PATH, fullpath, NULL))
118 lstrcpynW(fullpath, pwcsName, MAX_PATH);
120 This->pwcsName = HeapAlloc(GetProcessHeap(), 0,
121 (lstrlenW(fullpath)+1)*sizeof(WCHAR));
124 HeapFree(GetProcessHeap(), 0, This);
125 return E_OUTOFMEMORY;
127 strcpyW(This->pwcsName, fullpath);
130 This->pwcsName = NULL;
132 TRACE("file len %u\n", This->filesize.u.LowPart);
134 *pLockBytes = &This->ILockBytes_iface;
139 /* ILockByte Interfaces */
141 static HRESULT WINAPI FileLockBytesImpl_QueryInterface(ILockBytes *iface, REFIID riid,
144 if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_ILockBytes))
149 return E_NOINTERFACE;
152 IUnknown_AddRef((IUnknown*)*ppvObject);
157 static ULONG WINAPI FileLockBytesImpl_AddRef(ILockBytes *iface)
159 FileLockBytesImpl* This = impl_from_ILockBytes(iface);
160 return InterlockedIncrement(&This->ref);
163 static ULONG WINAPI FileLockBytesImpl_Release(ILockBytes *iface)
165 FileLockBytesImpl* This = impl_from_ILockBytes(iface);
168 ref = InterlockedDecrement(&This->ref);
172 CloseHandle(This->hfile);
173 HeapFree(GetProcessHeap(), 0, This->pwcsName);
174 HeapFree(GetProcessHeap(), 0, This);
180 /******************************************************************************
181 * This method is part of the ILockBytes interface.
183 * It reads a block of information from the byte array at the specified
186 * See the documentation of ILockBytes for more info.
188 static HRESULT WINAPI FileLockBytesImpl_ReadAt(
190 ULARGE_INTEGER ulOffset, /* [in] */
191 void* pv, /* [length_is][size_is][out] */
193 ULONG* pcbRead) /* [out] */
195 FileLockBytesImpl* This = impl_from_ILockBytes(iface);
196 ULONG bytes_left = cb;
199 LARGE_INTEGER offset;
202 TRACE("(%p)-> %i %p %i %p\n",This, ulOffset.u.LowPart, pv, cb, pcbRead);
204 /* verify a sane environment */
205 if (!This) return E_FAIL;
210 offset.QuadPart = ulOffset.QuadPart;
212 ret = SetFilePointerEx(This->hfile, offset, NULL, FILE_BEGIN);
215 return STG_E_READFAULT;
219 ret = ReadFile(This->hfile, readPtr, bytes_left, &cbRead, NULL);
221 if (!ret || cbRead == 0)
222 return STG_E_READFAULT;
227 bytes_left -= cbRead;
235 /******************************************************************************
236 * This method is part of the ILockBytes interface.
238 * It writes the specified bytes at the specified offset.
239 * position. If the file is too small, it will be resized.
241 * See the documentation of ILockBytes for more info.
243 static HRESULT WINAPI FileLockBytesImpl_WriteAt(
245 ULARGE_INTEGER ulOffset, /* [in] */
246 const void* pv, /* [size_is][in] */
248 ULONG* pcbWritten) /* [out] */
250 FileLockBytesImpl* This = impl_from_ILockBytes(iface);
251 ULONG size_needed = ulOffset.u.LowPart + cb;
252 ULONG bytes_left = cb;
253 const BYTE *writePtr = pv;
255 LARGE_INTEGER offset;
258 TRACE("(%p)-> %i %p %i %p\n",This, ulOffset.u.LowPart, pv, cb, pcbWritten);
260 /* verify a sane environment */
261 if (!This) return E_FAIL;
263 if (This->flProtect != PAGE_READWRITE)
264 return STG_E_ACCESSDENIED;
269 if (size_needed > This->filesize.u.LowPart)
271 ULARGE_INTEGER newSize;
272 newSize.u.HighPart = 0;
273 newSize.u.LowPart = size_needed;
274 ILockBytes_SetSize(iface, newSize);
277 offset.QuadPart = ulOffset.QuadPart;
279 ret = SetFilePointerEx(This->hfile, offset, NULL, FILE_BEGIN);
282 return STG_E_READFAULT;
286 ret = WriteFile(This->hfile, writePtr, bytes_left, &cbWritten, NULL);
289 return STG_E_READFAULT;
292 *pcbWritten += cbWritten;
294 bytes_left -= cbWritten;
295 writePtr += cbWritten;
302 static HRESULT WINAPI FileLockBytesImpl_Flush(ILockBytes* iface)
307 /******************************************************************************
310 * Sets the size of the file.
313 static HRESULT WINAPI FileLockBytesImpl_SetSize(ILockBytes* iface, ULARGE_INTEGER newSize)
315 FileLockBytesImpl* This = impl_from_ILockBytes(iface);
317 LARGE_INTEGER newpos;
319 if (This->filesize.u.LowPart == newSize.u.LowPart)
322 TRACE("from %u to %u\n", This->filesize.u.LowPart, newSize.u.LowPart);
324 newpos.QuadPart = newSize.QuadPart;
325 if (SetFilePointerEx(This->hfile, newpos, NULL, FILE_BEGIN))
327 SetEndOfFile(This->hfile);
330 This->filesize = newSize;
334 static HRESULT WINAPI FileLockBytesImpl_LockRegion(ILockBytes* iface,
335 ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
341 static HRESULT WINAPI FileLockBytesImpl_UnlockRegion(ILockBytes* iface,
342 ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
348 static HRESULT WINAPI FileLockBytesImpl_Stat(ILockBytes* iface,
349 STATSTG *pstatstg, DWORD grfStatFlag)
351 FileLockBytesImpl* This = impl_from_ILockBytes(iface);
353 if (!(STATFLAG_NONAME & grfStatFlag) && This->pwcsName)
356 CoTaskMemAlloc((lstrlenW(This->pwcsName)+1)*sizeof(WCHAR));
358 strcpyW(pstatstg->pwcsName, This->pwcsName);
361 pstatstg->pwcsName = NULL;
363 pstatstg->type = STGTY_LOCKBYTES;
364 pstatstg->cbSize = This->filesize;
365 /* FIXME: If the implementation is exported, we'll need to set other fields. */
370 static const ILockBytesVtbl FileLockBytesImpl_Vtbl = {
371 FileLockBytesImpl_QueryInterface,
372 FileLockBytesImpl_AddRef,
373 FileLockBytesImpl_Release,
374 FileLockBytesImpl_ReadAt,
375 FileLockBytesImpl_WriteAt,
376 FileLockBytesImpl_Flush,
377 FileLockBytesImpl_SetSize,
378 FileLockBytesImpl_LockRegion,
379 FileLockBytesImpl_UnlockRegion,
380 FileLockBytesImpl_Stat