dlls/ole32/filelockbytes.c

   1 /******************************************************************************
   2  *
   3  * File-based ILockBytes implementation
   4  *
   5  * Copyright 1999 Thuy Nguyen
   6  * Copyright 2010 Vincent Povirk for CodeWeavers
   7  *
   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.
  12  *
  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.
  17  *
  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
  21  */
  22
  23 #include <assert.h>
  24 #include <stdlib.h>
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <limits.h>
  29
  30 #define COBJMACROS
  31 #define NONAMELESSUNION
  32 #define NONAMELESSSTRUCT
  33
  34 #include "windef.h"
  35 #include "winbase.h"
  36 #include "winuser.h"
  37 #include "winerror.h"
  38 #include "objbase.h"
  39 #include "ole2.h"
  40
  41 #include "storage32.h"
  42
  43 #include "wine/debug.h"
  44 #include "wine/unicode.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(storage);
  47
  48 typedef struct FileLockBytesImpl
  49 {
  50     ILockBytes ILockBytes_iface;
  51     LONG ref;
  52     HANDLE hfile;
  53     DWORD flProtect;
  54     LPWSTR pwcsName;
  55 } FileLockBytesImpl;
  56
  57 static const ILockBytesVtbl FileLockBytesImpl_Vtbl;
  58
  59 static inline FileLockBytesImpl *impl_from_ILockBytes(ILockBytes *iface)
  60 {
  61     return CONTAINING_RECORD(iface, FileLockBytesImpl, ILockBytes_iface);
  62 }
  63
  64 /***********************************************************
  65  * Prototypes for private methods
  66  */
  67
  68 /****************************************************************************
  69  *      GetProtectMode
  70  *
  71  * This function will return a protection mode flag for a file-mapping object
  72  * from the open flags of a file.
  73  */
  74 static DWORD GetProtectMode(DWORD openFlags)
  75 {
  76     switch(STGM_ACCESS_MODE(openFlags))
  77     {
  78     case STGM_WRITE:
  79     case STGM_READWRITE:
  80         return PAGE_READWRITE;
  81     }
  82     return PAGE_READONLY;
  83 }
  84
  85 /******************************************************************************
  86  *      FileLockBytesImpl_Construct
  87  *
  88  * Initialize a big block object supported by a file.
  89  */
  90 HRESULT FileLockBytesImpl_Construct(HANDLE hFile, DWORD openFlags, LPCWSTR pwcsName, ILockBytes **pLockBytes)
  91 {
  92   FileLockBytesImpl *This;
  93   WCHAR fullpath[MAX_PATH];
  94
  95   if (hFile == INVALID_HANDLE_VALUE)
  96     return E_FAIL;
  97
  98   This = HeapAlloc(GetProcessHeap(), 0, sizeof(FileLockBytesImpl));
  99
 100   if (!This)
 101     return E_OUTOFMEMORY;
 102
 103   This->ILockBytes_iface.lpVtbl = &FileLockBytesImpl_Vtbl;
 104   This->ref = 1;
 105   This->hfile = hFile;
 106   This->flProtect = GetProtectMode(openFlags);
 107
 108   if(pwcsName) {
 109     if (!GetFullPathNameW(pwcsName, MAX_PATH, fullpath, NULL))
 110     {
 111       lstrcpynW(fullpath, pwcsName, MAX_PATH);
 112     }
 113     This->pwcsName = HeapAlloc(GetProcessHeap(), 0,
 114                               (lstrlenW(fullpath)+1)*sizeof(WCHAR));
 115     if (!This->pwcsName)
 116     {
 117        HeapFree(GetProcessHeap(), 0, This);
 118        return E_OUTOFMEMORY;
 119     }
 120     strcpyW(This->pwcsName, fullpath);
 121   }
 122   else
 123     This->pwcsName = NULL;
 124
 125   *pLockBytes = &This->ILockBytes_iface;
 126
 127   return S_OK;
 128 }
 129
 130 /* ILockByte Interfaces */
 131
 132 static HRESULT WINAPI FileLockBytesImpl_QueryInterface(ILockBytes *iface, REFIID riid,
 133     void **ppvObject)
 134 {
 135     if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_ILockBytes))
 136         *ppvObject = iface;
 137     else
 138     {
 139         *ppvObject = NULL;
 140         return E_NOINTERFACE;
 141     }
 142
 143     IUnknown_AddRef((IUnknown*)*ppvObject);
 144
 145     return S_OK;
 146 }
 147
 148 static ULONG WINAPI FileLockBytesImpl_AddRef(ILockBytes *iface)
 149 {
 150     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 151     return InterlockedIncrement(&This->ref);
 152 }
 153
 154 static ULONG WINAPI FileLockBytesImpl_Release(ILockBytes *iface)
 155 {
 156     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 157     ULONG ref;
 158
 159     ref = InterlockedDecrement(&This->ref);
 160
 161     if (ref == 0)
 162     {
 163         CloseHandle(This->hfile);
 164         HeapFree(GetProcessHeap(), 0, This->pwcsName);
 165         HeapFree(GetProcessHeap(), 0, This);
 166     }
 167
 168     return ref;
 169 }
 170
 171 /******************************************************************************
 172  * This method is part of the ILockBytes interface.
 173  *
 174  * It reads a block of information from the byte array at the specified
 175  * offset.
 176  *
 177  * See the documentation of ILockBytes for more info.
 178  */
 179 static HRESULT WINAPI FileLockBytesImpl_ReadAt(
 180       ILockBytes* iface,
 181       ULARGE_INTEGER ulOffset,  /* [in] */
 182       void*          pv,        /* [length_is][size_is][out] */
 183       ULONG          cb,        /* [in] */
 184       ULONG*         pcbRead)   /* [out] */
 185 {
 186     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 187     ULONG bytes_left = cb;
 188     LPBYTE readPtr = pv;
 189     BOOL ret;
 190     LARGE_INTEGER offset;
 191     ULONG cbRead;
 192
 193     TRACE("(%p)-> %i %p %i %p\n",This, ulOffset.u.LowPart, pv, cb, pcbRead);
 194
 195     /* verify a sane environment */
 196     if (!This) return E_FAIL;
 197
 198     if (pcbRead)
 199         *pcbRead = 0;
 200
 201     offset.QuadPart = ulOffset.QuadPart;
 202
 203     ret = SetFilePointerEx(This->hfile, offset, NULL, FILE_BEGIN);
 204
 205     if (!ret)
 206         return STG_E_READFAULT;
 207
 208     while (bytes_left)
 209     {
 210         ret = ReadFile(This->hfile, readPtr, bytes_left, &cbRead, NULL);
 211
 212         if (!ret || cbRead == 0)
 213             return STG_E_READFAULT;
 214
 215         if (pcbRead)
 216             *pcbRead += cbRead;
 217
 218         bytes_left -= cbRead;
 219         readPtr += cbRead;
 220     }
 221
 222     TRACE("finished\n");
 223     return S_OK;
 224 }
 225
 226 /******************************************************************************
 227  * This method is part of the ILockBytes interface.
 228  *
 229  * It writes the specified bytes at the specified offset.
 230  * position. If the file is too small, it will be resized.
 231  *
 232  * See the documentation of ILockBytes for more info.
 233  */
 234 static HRESULT WINAPI FileLockBytesImpl_WriteAt(
 235       ILockBytes* iface,
 236       ULARGE_INTEGER ulOffset,    /* [in] */
 237       const void*    pv,          /* [size_is][in] */
 238       ULONG          cb,          /* [in] */
 239       ULONG*         pcbWritten)  /* [out] */
 240 {
 241     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 242     ULONG bytes_left = cb;
 243     const BYTE *writePtr = pv;
 244     BOOL ret;
 245     LARGE_INTEGER offset;
 246     ULONG cbWritten;
 247
 248     TRACE("(%p)-> %i %p %i %p\n",This, ulOffset.u.LowPart, pv, cb, pcbWritten);
 249
 250     /* verify a sane environment */
 251     if (!This) return E_FAIL;
 252
 253     if (This->flProtect != PAGE_READWRITE)
 254         return STG_E_ACCESSDENIED;
 255
 256     if (pcbWritten)
 257         *pcbWritten = 0;
 258
 259     offset.QuadPart = ulOffset.QuadPart;
 260
 261     ret = SetFilePointerEx(This->hfile, offset, NULL, FILE_BEGIN);
 262
 263     if (!ret)
 264         return STG_E_WRITEFAULT;
 265
 266     while (bytes_left)
 267     {
 268         ret = WriteFile(This->hfile, writePtr, bytes_left, &cbWritten, NULL);
 269
 270         if (!ret)
 271             return STG_E_WRITEFAULT;
 272
 273         if (pcbWritten)
 274             *pcbWritten += cbWritten;
 275
 276         bytes_left -= cbWritten;
 277         writePtr += cbWritten;
 278     }
 279
 280     TRACE("finished\n");
 281     return S_OK;
 282 }
 283
 284 static HRESULT WINAPI FileLockBytesImpl_Flush(ILockBytes* iface)
 285 {
 286     return S_OK;
 287 }
 288
 289 /******************************************************************************
 290  *      ILockBytes_SetSize
 291  *
 292  * Sets the size of the file.
 293  *
 294  */
 295 static HRESULT WINAPI FileLockBytesImpl_SetSize(ILockBytes* iface, ULARGE_INTEGER newSize)
 296 {
 297     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 298     HRESULT hr = S_OK;
 299     LARGE_INTEGER newpos;
 300
 301     TRACE("new size %u\n", newSize.u.LowPart);
 302
 303     newpos.QuadPart = newSize.QuadPart;
 304     if (SetFilePointerEx(This->hfile, newpos, NULL, FILE_BEGIN))
 305     {
 306         SetEndOfFile(This->hfile);
 307     }
 308
 309     return hr;
 310 }
 311
 312 static HRESULT get_lock_error(void)
 313 {
 314     switch (GetLastError())
 315     {
 316     case ERROR_LOCK_VIOLATION: return STG_E_LOCKVIOLATION; break;
 317     case ERROR_ACCESS_DENIED:  return STG_E_ACCESSDENIED; break;
 318     case ERROR_NOT_SUPPORTED:  return STG_E_INVALIDFUNCTION; break;
 319     default:
 320         FIXME("no mapping for error %d\n", GetLastError());
 321         return STG_E_INVALIDFUNCTION;
 322     }
 323 }
 324
 325 static HRESULT WINAPI FileLockBytesImpl_LockRegion(ILockBytes* iface,
 326     ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
 327 {
 328     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 329     OVERLAPPED ol;
 330     DWORD lock_flags = LOCKFILE_FAIL_IMMEDIATELY;
 331
 332     TRACE("ofs %u count %u flags %x\n", libOffset.u.LowPart, cb.u.LowPart, dwLockType);
 333
 334     if (dwLockType & LOCK_WRITE)
 335         return STG_E_INVALIDFUNCTION;
 336
 337     if (dwLockType & (LOCK_EXCLUSIVE|LOCK_ONLYONCE))
 338         lock_flags |= LOCKFILE_EXCLUSIVE_LOCK;
 339
 340     ol.hEvent = 0;
 341     ol.u.s.Offset = libOffset.u.LowPart;
 342     ol.u.s.OffsetHigh = libOffset.u.HighPart;
 343
 344     if (LockFileEx(This->hfile, lock_flags, 0, cb.u.LowPart, cb.u.HighPart, &ol))
 345         return S_OK;
 346     return get_lock_error();
 347 }
 348
 349 static HRESULT WINAPI FileLockBytesImpl_UnlockRegion(ILockBytes* iface,
 350     ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
 351 {
 352     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 353     OVERLAPPED ol;
 354
 355     TRACE("ofs %u count %u flags %x\n", libOffset.u.LowPart, cb.u.LowPart, dwLockType);
 356
 357     if (dwLockType & LOCK_WRITE)
 358         return STG_E_INVALIDFUNCTION;
 359
 360     ol.hEvent = 0;
 361     ol.u.s.Offset = libOffset.u.LowPart;
 362     ol.u.s.OffsetHigh = libOffset.u.HighPart;
 363
 364     if (UnlockFileEx(This->hfile, 0, cb.u.LowPart, cb.u.HighPart, &ol))
 365         return S_OK;
 366     return get_lock_error();
 367 }
 368
 369 static HRESULT WINAPI FileLockBytesImpl_Stat(ILockBytes* iface,
 370     STATSTG *pstatstg, DWORD grfStatFlag)
 371 {
 372     FileLockBytesImpl* This = impl_from_ILockBytes(iface);
 373
 374     if (!(STATFLAG_NONAME & grfStatFlag) && This->pwcsName)
 375     {
 376         pstatstg->pwcsName =
 377           CoTaskMemAlloc((lstrlenW(This->pwcsName)+1)*sizeof(WCHAR));
 378
 379         strcpyW(pstatstg->pwcsName, This->pwcsName);
 380     }
 381     else
 382         pstatstg->pwcsName = NULL;
 383
 384     pstatstg->type = STGTY_LOCKBYTES;
 385
 386     pstatstg->cbSize.u.LowPart = GetFileSize(This->hfile, &pstatstg->cbSize.u.HighPart);
 387     /* FIXME: If the implementation is exported, we'll need to set other fields. */
 388
 389     pstatstg->grfLocksSupported = LOCK_EXCLUSIVE|LOCK_ONLYONCE|WINE_LOCK_READ;
 390
 391     return S_OK;
 392 }
 393
 394 static const ILockBytesVtbl FileLockBytesImpl_Vtbl = {
 395     FileLockBytesImpl_QueryInterface,
 396     FileLockBytesImpl_AddRef,
 397     FileLockBytesImpl_Release,
 398     FileLockBytesImpl_ReadAt,
 399     FileLockBytesImpl_WriteAt,
 400     FileLockBytesImpl_Flush,
 401     FileLockBytesImpl_SetSize,
 402     FileLockBytesImpl_LockRegion,
 403     FileLockBytesImpl_UnlockRegion,
 404     FileLockBytesImpl_Stat
 405 };