reactos/dll/win32/qmgr/enum_files.c

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/*
* Queue Manager (BITS) File Enumerator
*
* Copyright 2007, 2008 Google (Roy Shea, Dan Hipschman)
*
* 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 "qmgr.h"
typedef struct
{
IEnumBackgroundCopyFiles IEnumBackgroundCopyFiles_iface;
LONG ref;
IBackgroundCopyFile2 **files;
ULONG numFiles;
ULONG indexFiles;
} EnumBackgroundCopyFilesImpl;
static inline EnumBackgroundCopyFilesImpl *impl_from_IEnumBackgroundCopyFiles(IEnumBackgroundCopyFiles *iface)
{
return CONTAINING_RECORD(iface, EnumBackgroundCopyFilesImpl, IEnumBackgroundCopyFiles_iface);
}
static HRESULT WINAPI EnumBackgroundCopyFiles_QueryInterface(IEnumBackgroundCopyFiles *iface,
REFIID riid, void **ppv)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
TRACE("(%p)->(%s, %p)\n", This, debugstr_guid(riid), ppv);
if (IsEqualGUID(riid, &IID_IUnknown) || IsEqualGUID(riid, &IID_IEnumBackgroundCopyFiles))
{
*ppv = iface;
IEnumBackgroundCopyFiles_AddRef(iface);
return S_OK;
}
*ppv = NULL;
return E_NOINTERFACE;
}
static ULONG WINAPI EnumBackgroundCopyFiles_AddRef(IEnumBackgroundCopyFiles *iface)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
ULONG ref = InterlockedIncrement(&This->ref);
TRACE("(%p)->(%d)\n", This, ref);
return ref;
}
static ULONG WINAPI EnumBackgroundCopyFiles_Release(IEnumBackgroundCopyFiles *iface)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
ULONG ref = InterlockedDecrement(&This->ref);
ULONG i;
TRACE("(%p)->(%d)\n", This, ref);
if (ref == 0)
{
for(i = 0; i < This->numFiles; i++)
IBackgroundCopyFile2_Release(This->files[i]);
HeapFree(GetProcessHeap(), 0, This->files);
HeapFree(GetProcessHeap(), 0, This);
}
return ref;
}
/* Return reference to one or more files in the file enumerator */
static HRESULT WINAPI EnumBackgroundCopyFiles_Next(IEnumBackgroundCopyFiles *iface,
ULONG celt, IBackgroundCopyFile **rgelt, ULONG *pceltFetched)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
ULONG fetched;
ULONG i;
IBackgroundCopyFile2 *file;
TRACE("(%p)->(%d %p %p)\n", This, celt, rgelt, pceltFetched);
/* Despite documented behavior, Windows (tested on XP) is not verifying
that the caller set pceltFetched to zero. No check here. */
fetched = min(celt, This->numFiles - This->indexFiles);
if (pceltFetched)
*pceltFetched = fetched;
else
{
/* We need to initialize this array if the caller doesn't request
the length because length_is will default to celt. */
for (i = 0; i < celt; i++)
rgelt[i] = NULL;
/* pceltFetched can only be NULL if celt is 1 */
if (celt != 1)
return E_INVALIDARG;
}
/* Fill in the array of objects */
for (i = 0; i < fetched; i++)
{
file = This->files[This->indexFiles++];
IBackgroundCopyFile2_AddRef(file);
rgelt[i] = (IBackgroundCopyFile *)file;
}
return fetched == celt ? S_OK : S_FALSE;
}
/* Skip over one or more files in the file enumerator */
static HRESULT WINAPI EnumBackgroundCopyFiles_Skip(IEnumBackgroundCopyFiles *iface,
ULONG celt)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
TRACE("(%p)->(%d)\n", This, celt);
if (celt > This->numFiles - This->indexFiles)
{
This->indexFiles = This->numFiles;
return S_FALSE;
}
This->indexFiles += celt;
return S_OK;
}
static HRESULT WINAPI EnumBackgroundCopyFiles_Reset(IEnumBackgroundCopyFiles *iface)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
TRACE("(%p)\n", This);
This->indexFiles = 0;
return S_OK;
}
static HRESULT WINAPI EnumBackgroundCopyFiles_Clone(IEnumBackgroundCopyFiles *iface,
IEnumBackgroundCopyFiles **ppenum)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
FIXME("(%p)->(%p): stub\n", This, ppenum);
return E_NOTIMPL;
}
static HRESULT WINAPI EnumBackgroundCopyFiles_GetCount(IEnumBackgroundCopyFiles *iface,
ULONG *puCount)
{
EnumBackgroundCopyFilesImpl *This = impl_from_IEnumBackgroundCopyFiles(iface);
TRACE("(%p)->(%p)\n", This, puCount);
*puCount = This->numFiles;
return S_OK;
}
static const IEnumBackgroundCopyFilesVtbl EnumBackgroundCopyFilesVtbl =
{
EnumBackgroundCopyFiles_QueryInterface,
EnumBackgroundCopyFiles_AddRef,
EnumBackgroundCopyFiles_Release,
EnumBackgroundCopyFiles_Next,
EnumBackgroundCopyFiles_Skip,
EnumBackgroundCopyFiles_Reset,
EnumBackgroundCopyFiles_Clone,
EnumBackgroundCopyFiles_GetCount
};
HRESULT EnumBackgroundCopyFilesConstructor(BackgroundCopyJobImpl *job, IEnumBackgroundCopyFiles **enum_files)
{
EnumBackgroundCopyFilesImpl *This;
BackgroundCopyFileImpl *file;
ULONG i;
TRACE("%p, %p)\n", job, enum_files);
This = HeapAlloc(GetProcessHeap(), 0, sizeof *This);
if (!This)
return E_OUTOFMEMORY;
This->IEnumBackgroundCopyFiles_iface.lpVtbl = &EnumBackgroundCopyFilesVtbl;
This->ref = 1;
/* Create array of files */
This->indexFiles = 0;
EnterCriticalSection(&job->cs);
This->numFiles = list_count(&job->files);
This->files = NULL;
if (This->numFiles > 0)
{
This->files = HeapAlloc(GetProcessHeap(), 0,
This->numFiles * sizeof This->files[0]);
if (!This->files)
{
LeaveCriticalSection(&job->cs);
HeapFree(GetProcessHeap(), 0, This);
return E_OUTOFMEMORY;
}
}
i = 0;
LIST_FOR_EACH_ENTRY(file, &job->files, BackgroundCopyFileImpl, entryFromJob)
{
IBackgroundCopyFile2_AddRef(&file->IBackgroundCopyFile2_iface);
This->files[i] = &file->IBackgroundCopyFile2_iface;
++i;
}
LeaveCriticalSection(&job->cs);
*enum_files = &This->IEnumBackgroundCopyFiles_iface;
return S_OK;
}