Sweden-Number/dlls/combase/hglobalstream.c

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/*
* HGLOBAL Stream implementation
*
* Copyright 1999 Francis Beaudet
* Copyright 2016 Dmitry Timoshkov
*
* 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
*/
#define COBJMACROS
#define NONAMELESSUNION
#include "objbase.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(storage);
struct handle_wrapper
{
LONG ref;
HGLOBAL hglobal;
ULONG size;
BOOL delete_on_release;
};
static void handle_addref(struct handle_wrapper *handle)
{
InterlockedIncrement(&handle->ref);
}
static void handle_release(struct handle_wrapper *handle)
{
ULONG ref = InterlockedDecrement(&handle->ref);
if (!ref)
{
if (handle->delete_on_release) GlobalFree(handle->hglobal);
HeapFree(GetProcessHeap(), 0, handle);
}
}
static struct handle_wrapper *handle_create(HGLOBAL hglobal, BOOL delete_on_release)
{
struct handle_wrapper *handle;
handle = HeapAlloc(GetProcessHeap(), 0, sizeof(*handle));
if (!handle) return NULL;
/* allocate a handle if one is not supplied */
if (!hglobal) hglobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD | GMEM_SHARE, 0);
if (!hglobal)
{
HeapFree(GetProcessHeap(), 0, handle);
return NULL;
}
handle->ref = 1;
handle->hglobal = hglobal;
handle->size = GlobalSize(hglobal);
handle->delete_on_release = delete_on_release;
return handle;
}
struct hglobal_stream
{
IStream IStream_iface;
LONG ref;
struct handle_wrapper *handle;
ULARGE_INTEGER position;
};
static inline struct hglobal_stream *impl_from_IStream(IStream *iface)
{
return CONTAINING_RECORD(iface, struct hglobal_stream, IStream_iface);
}
static const IStreamVtbl hglobalstreamvtbl;
static struct hglobal_stream *hglobalstream_construct(void)
{
struct hglobal_stream *object = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*object));
if (object)
{
object->IStream_iface.lpVtbl = &hglobalstreamvtbl;
object->ref = 1;
}
return object;
}
static HRESULT WINAPI stream_QueryInterface(IStream *iface, REFIID riid, void **obj)
{
if (!obj)
return E_INVALIDARG;
if (IsEqualIID(&IID_IUnknown, riid) ||
IsEqualIID(&IID_ISequentialStream, riid) ||
IsEqualIID(&IID_IStream, riid))
{
*obj = iface;
IStream_AddRef(iface);
return S_OK;
}
*obj = NULL;
return E_NOINTERFACE;
}
static ULONG WINAPI stream_AddRef(IStream *iface)
{
struct hglobal_stream *stream = impl_from_IStream(iface);
return InterlockedIncrement(&stream->ref);
}
static ULONG WINAPI stream_Release(IStream *iface)
{
struct hglobal_stream *stream = impl_from_IStream(iface);
ULONG ref = InterlockedDecrement(&stream->ref);
if (!ref)
{
handle_release(stream->handle);
HeapFree(GetProcessHeap(), 0, stream);
}
return ref;
}
static HRESULT WINAPI stream_Read(IStream *iface, void *pv, ULONG cb, ULONG *read_len)
{
struct hglobal_stream *stream = impl_from_IStream(iface);
ULONG dummy, len;
char *buffer;
TRACE("%p, %p, %d, %p\n", iface, pv, cb, read_len);
if (!read_len)
read_len = &dummy;
len = min(stream->handle->size - stream->position.u.LowPart, cb);
buffer = GlobalLock(stream->handle->hglobal);
if (!buffer)
{
WARN("Failed to lock hglobal %p\n", stream->handle->hglobal);
*read_len = 0;
return S_OK;
}
memcpy(pv, buffer + stream->position.u.LowPart, len);
stream->position.u.LowPart += len;
*read_len = len;
GlobalUnlock(stream->handle->hglobal);
return S_OK;
}
static HRESULT WINAPI stream_Write(IStream *iface, const void *pv, ULONG cb, ULONG *written)
{
struct hglobal_stream *stream = impl_from_IStream(iface);
ULARGE_INTEGER size;
ULONG dummy = 0;
char *buffer;
TRACE("%p, %p, %d, %p\n", iface, pv, cb, written);
if (!written)
written = &dummy;
if (!cb)
goto out;
*written = 0;
size.u.HighPart = 0;
size.u.LowPart = stream->position.u.LowPart + cb;
if (size.u.LowPart > stream->handle->size)
{
/* grow stream */
HRESULT hr = IStream_SetSize(iface, size);
if (FAILED(hr))
{
ERR("IStream_SetSize failed with error 0x%08x\n", hr);
return hr;
}
}
buffer = GlobalLock(stream->handle->hglobal);
if (!buffer)
{
WARN("write to invalid hglobal %p\n", stream->handle->hglobal);
return S_OK;
}
memcpy(buffer + stream->position.u.LowPart, pv, cb);
stream->position.u.LowPart += cb;
GlobalUnlock(stream->handle->hglobal);
out:
*written = cb;
return S_OK;
}
static HRESULT WINAPI stream_Seek(IStream *iface, LARGE_INTEGER move, DWORD origin,
ULARGE_INTEGER *pos)
{
struct hglobal_stream *stream = impl_from_IStream(iface);
ULARGE_INTEGER position = stream->position;
HRESULT hr = S_OK;
TRACE("%p, %s, %d, %p\n", iface, wine_dbgstr_longlong(move.QuadPart), origin, pos);
switch (origin)
{
case STREAM_SEEK_SET:
position.QuadPart = 0;
break;
case STREAM_SEEK_CUR:
break;
case STREAM_SEEK_END:
position.QuadPart = stream->handle->size;
break;
default:
hr = STG_E_SEEKERROR;
goto end;
}
position.u.HighPart = 0;
position.u.LowPart += move.QuadPart;
if (move.u.LowPart >= 0x80000000 && position.u.LowPart >= move.u.LowPart)
{
/* We tried to seek backwards and went past the start. */
hr = STG_E_SEEKERROR;
goto end;
}
stream->position = position;
end:
if (pos) *pos = stream->position;
return hr;
}
static HRESULT WINAPI stream_SetSize(IStream *iface, ULARGE_INTEGER size)
{
struct hglobal_stream *stream = impl_from_IStream(iface);
HGLOBAL hglobal;
TRACE("%p, %s\n", iface, wine_dbgstr_longlong(size.QuadPart));
if (stream->handle->size == size.u.LowPart)
return S_OK;
hglobal = GlobalReAlloc(stream->handle->hglobal, size.u.LowPart, GMEM_MOVEABLE);
if (!hglobal)
return E_OUTOFMEMORY;
stream->handle->hglobal = hglobal;
stream->handle->size = size.u.LowPart;
return S_OK;
}
static HRESULT WINAPI stream_CopyTo(IStream *iface, IStream *dest, ULARGE_INTEGER cb,
ULARGE_INTEGER *read_len, ULARGE_INTEGER *written)
{
ULARGE_INTEGER total_read, total_written;
HRESULT hr = S_OK;
BYTE buffer[128];
TRACE("%p, %p, %d, %p, %p\n", iface, dest, cb.u.LowPart, read_len, written);
if (!dest)
return STG_E_INVALIDPOINTER;
total_read.QuadPart = 0;
total_written.QuadPart = 0;
while (cb.QuadPart > 0)
{
ULONG chunk_size = cb.QuadPart >= sizeof(buffer) ? sizeof(buffer) : cb.u.LowPart;
ULONG chunk_read, chunk_written;
hr = IStream_Read(iface, buffer, chunk_size, &chunk_read);
if (FAILED(hr))
break;
total_read.QuadPart += chunk_read;
if (chunk_read)
{
hr = IStream_Write(dest, buffer, chunk_read, &chunk_written);
if (FAILED(hr))
break;
total_written.QuadPart += chunk_written;
}
if (chunk_read != chunk_size)
cb.QuadPart = 0;
else
cb.QuadPart -= chunk_read;
}
if (read_len)
read_len->QuadPart = total_read.QuadPart;
if (written)
written->QuadPart = total_written.QuadPart;
return hr;
}
static HRESULT WINAPI stream_Commit(IStream *iface, DWORD flags)
{
return S_OK;
}
static HRESULT WINAPI stream_Revert(IStream *iface)
{
return S_OK;
}
static HRESULT WINAPI stream_LockRegion(IStream *iface, ULARGE_INTEGER offset,
ULARGE_INTEGER len, DWORD lock_type)
{
return STG_E_INVALIDFUNCTION;
}
static HRESULT WINAPI stream_UnlockRegion(IStream *iface, ULARGE_INTEGER offset,
ULARGE_INTEGER len, DWORD lock_type)
{
return S_OK;
}
static HRESULT WINAPI stream_Stat(IStream *iface, STATSTG *pstatstg, DWORD flags)
{
struct hglobal_stream *stream = impl_from_IStream(iface);
memset(pstatstg, 0, sizeof(STATSTG));
pstatstg->pwcsName = NULL;
pstatstg->type = STGTY_STREAM;
pstatstg->cbSize.QuadPart = stream->handle->size;
return S_OK;
}
static HRESULT WINAPI stream_Clone(IStream *iface, IStream **ppstm)
{
struct hglobal_stream *stream = impl_from_IStream(iface), *clone;
ULARGE_INTEGER dummy;
LARGE_INTEGER offset;
TRACE("%p, %p\n", iface, ppstm);
*ppstm = NULL;
clone = hglobalstream_construct();
if (!clone) return E_OUTOFMEMORY;
*ppstm = &clone->IStream_iface;
handle_addref(stream->handle);
clone->handle = stream->handle;
offset.QuadPart = (LONGLONG)stream->position.QuadPart;
IStream_Seek(*ppstm, offset, STREAM_SEEK_SET, &dummy);
return S_OK;
}
static const IStreamVtbl hglobalstreamvtbl =
{
stream_QueryInterface,
stream_AddRef,
stream_Release,
stream_Read,
stream_Write,
stream_Seek,
stream_SetSize,
stream_CopyTo,
stream_Commit,
stream_Revert,
stream_LockRegion,
stream_UnlockRegion,
stream_Stat,
stream_Clone
};
/***********************************************************************
* CreateStreamOnHGlobal (combase.@)
*/
HRESULT WINAPI CreateStreamOnHGlobal(HGLOBAL hGlobal, BOOL delete_on_release, IStream **stream)
{
struct hglobal_stream *object;
if (!stream)
return E_INVALIDARG;
object = hglobalstream_construct();
if (!object) return E_OUTOFMEMORY;
object->handle = handle_create(hGlobal, delete_on_release);
if (!object->handle)
{
HeapFree(GetProcessHeap(), 0, object);
return E_OUTOFMEMORY;
}
*stream = &object->IStream_iface;
return S_OK;
}
/***********************************************************************
* GetHGlobalFromStream (combase.@)
*/
HRESULT WINAPI GetHGlobalFromStream(IStream *stream, HGLOBAL *phglobal)
{
struct hglobal_stream *object;
if (!stream || !phglobal)
return E_INVALIDARG;
object = impl_from_IStream(stream);
if (object->IStream_iface.lpVtbl == &hglobalstreamvtbl)
*phglobal = object->handle->hglobal;
else
{
*phglobal = 0;
return E_INVALIDARG;
}
return S_OK;
}