/******************************************************************************
* 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 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);
/* 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;
}
/******************************************************************************
* 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 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;
}
HRESULT FileLockBytesImpl_LockRegionSync(ILockBytes* iface,
ULARGE_INTEGER libOffset, ULARGE_INTEGER cb)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
OVERLAPPED ol;
if (iface->lpVtbl != &FileLockBytesImpl_Vtbl)
return E_NOTIMPL;
ol.hEvent = 0;
ol.u.s.Offset = libOffset.u.LowPart;
ol.u.s.OffsetHigh = libOffset.u.HighPart;
if (LockFileEx(This->hfile, LOCKFILE_EXCLUSIVE_LOCK, 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));
strcpyW(pstatstg->pwcsName, This->pwcsName);
}
else
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 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 ULONG WINAPI FileLockBytesImpl_AddRef(ILockBytes *iface)
{
FileLockBytesImpl* This = impl_from_ILockBytes(iface);
return InterlockedIncrement(&This->ref);
}