dlls/dmusic/download.c

   1 /*
   2  * IDirectMusicDownload Implementation
   3  *
   4  * Copyright (C) 2003-2004 Rok Mandeljc
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "dmusic_private.h"
  22
  23 WINE_DEFAULT_DEBUG_CHANNEL(dmusic);
  24
  25 struct download
  26 {
  27     IDirectMusicDownload IDirectMusicDownload_iface;
  28     LONG ref;
  29
  30     DWORD size;
  31     BYTE data[];
  32 };
  33
  34 C_ASSERT(sizeof(struct download) == offsetof(struct download, data[0]));
  35
  36 static inline struct download *impl_from_IDirectMusicDownload(IDirectMusicDownload *iface)
  37 {
  38     return CONTAINING_RECORD(iface, struct download, IDirectMusicDownload_iface);
  39 }
  40
  41 static HRESULT WINAPI download_QueryInterface(IDirectMusicDownload *iface, REFIID riid, void **ret_iface)
  42 {
  43     TRACE("(%p, %s, %p)\n", iface, debugstr_dmguid(riid), ret_iface);
  44
  45     if (IsEqualIID(riid, &IID_IUnknown) ||
  46         IsEqualIID(riid, &IID_IDirectMusicDownload))
  47     {
  48         IDirectMusicDownload_AddRef(iface);
  49         *ret_iface = iface;
  50         return S_OK;
  51     }
  52
  53     *ret_iface = NULL;
  54     WARN("(%p, %s, %p): not found\n", iface, debugstr_dmguid(riid), ret_iface);
  55     return E_NOINTERFACE;
  56 }
  57
  58 static ULONG WINAPI download_AddRef(IDirectMusicDownload *iface)
  59 {
  60     struct download *This = impl_from_IDirectMusicDownload(iface);
  61     ULONG ref = InterlockedIncrement(&This->ref);
  62
  63     TRACE("(%p): new ref = %lu\n", iface, ref);
  64
  65     return ref;
  66 }
  67
  68 static ULONG WINAPI download_Release(IDirectMusicDownload *iface)
  69 {
  70     struct download *This = impl_from_IDirectMusicDownload(iface);
  71     ULONG ref = InterlockedDecrement(&This->ref);
  72
  73     TRACE("(%p): new ref = %lu\n", iface, ref);
  74
  75     if (!ref) {
  76         free(This);
  77     }
  78
  79     return ref;
  80 }
  81
  82 static HRESULT WINAPI download_GetBuffer(IDirectMusicDownload *iface, void **buffer, DWORD *size)
  83 {
  84     struct download *This = impl_from_IDirectMusicDownload(iface);
  85
  86     TRACE("(%p, %p, %p)\n", iface, buffer, size);
  87
  88     *buffer = This->data;
  89     *size = This->size;
  90
  91     return S_OK;
  92 }
  93
  94 static const IDirectMusicDownloadVtbl download_vtbl =
  95 {
  96     download_QueryInterface,
  97     download_AddRef,
  98     download_Release,
  99     download_GetBuffer,
 100 };
 101
 102 HRESULT download_create(DWORD size, IDirectMusicDownload **ret_iface)
 103 {
 104     struct download *download;
 105
 106     *ret_iface = NULL;
 107     if (!(download = malloc(offsetof(struct download, data[size])))) return E_OUTOFMEMORY;
 108     download->IDirectMusicDownload_iface.lpVtbl = &download_vtbl;
 109     download->ref = 1;
 110     download->size = size;
 111
 112     TRACE("Created DirectMusicDownload %p\n", download);
 113     *ret_iface = &download->IDirectMusicDownload_iface;
 114     return S_OK;
 115 }