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collection.c

/* IDirectMusicCollection Implementation
 *
 * Copyright (C) 2003-2004 Rok Mandeljc
 *
 * This program 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 program 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 program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "dmusic_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(dmusic);
WINE_DECLARE_DEBUG_CHANNEL(dmfile);

static ULONG WINAPI IDirectMusicCollectionImpl_IUnknown_AddRef (LPUNKNOWN iface);
static ULONG WINAPI IDirectMusicCollectionImpl_IDirectMusicCollection_AddRef (LPDIRECTMUSICCOLLECTION iface);
static ULONG WINAPI IDirectMusicCollectionImpl_IDirectMusicObject_AddRef (LPDIRECTMUSICOBJECT iface);
static ULONG WINAPI IDirectMusicCollectionImpl_IPersistStream_AddRef (LPPERSISTSTREAM iface);

/*****************************************************************************
 * IDirectMusicCollectionImpl implementation
 */
/* IDirectMusicCollectionImpl IUnknown part: */
static HRESULT WINAPI IDirectMusicCollectionImpl_IUnknown_QueryInterface (LPUNKNOWN iface, REFIID riid, LPVOID *ppobj) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, UnknownVtbl, iface);
      TRACE("(%p, %s, %p)\n", This, debugstr_dmguid(riid), ppobj);

      if (IsEqualIID (riid, &IID_IUnknown)) {
            *ppobj = &This->UnknownVtbl;
            IDirectMusicCollectionImpl_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
            return S_OK;      
      } else if (IsEqualIID (riid, &IID_IDirectMusicCollection)) {
            *ppobj = &This->CollectionVtbl;
            IDirectMusicCollectionImpl_IDirectMusicCollection_AddRef ((LPDIRECTMUSICCOLLECTION)&This->CollectionVtbl);
            return S_OK;
      } else if (IsEqualIID (riid, &IID_IDirectMusicObject)) {
            *ppobj = &This->ObjectVtbl;
            IDirectMusicCollectionImpl_IDirectMusicObject_AddRef ((LPDIRECTMUSICOBJECT)&This->ObjectVtbl);        
            return S_OK;
      } else if (IsEqualIID (riid, &IID_IPersistStream)) {
            *ppobj = &This->PersistStreamVtbl;
            IDirectMusicCollectionImpl_IPersistStream_AddRef ((LPPERSISTSTREAM)&This->PersistStreamVtbl);         
            return S_OK;
      }
      
      WARN("(%p, %s, %p): not found\n", This, debugstr_dmguid(riid), ppobj);
      return E_NOINTERFACE;
}

static ULONG WINAPI IDirectMusicCollectionImpl_IUnknown_AddRef (LPUNKNOWN iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, UnknownVtbl, iface);
      ULONG refCount = InterlockedIncrement(&This->ref);

      TRACE("(%p)->(ref before=%u)\n", This, refCount - 1);

      DMUSIC_LockModule();

      return refCount;
}

static ULONG WINAPI IDirectMusicCollectionImpl_IUnknown_Release (LPUNKNOWN iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, UnknownVtbl, iface);
      ULONG refCount = InterlockedDecrement(&This->ref);

      TRACE("(%p)->(ref before=%u)\n", This, refCount + 1);

      if (!refCount) {
            HeapFree(GetProcessHeap(), 0, This);
      }

      DMUSIC_UnlockModule();

      return refCount;
}

static const IUnknownVtbl DirectMusicCollection_Unknown_Vtbl = {
      IDirectMusicCollectionImpl_IUnknown_QueryInterface,
      IDirectMusicCollectionImpl_IUnknown_AddRef,
      IDirectMusicCollectionImpl_IUnknown_Release
};

/* IDirectMusicCollectionImpl IDirectMusicCollection part: */
static HRESULT WINAPI IDirectMusicCollectionImpl_IDirectMusicCollection_QueryInterface (LPDIRECTMUSICCOLLECTION iface, REFIID riid, LPVOID *ppobj) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, CollectionVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_QueryInterface ((LPUNKNOWN)&This->UnknownVtbl, riid, ppobj);
}

static ULONG WINAPI IDirectMusicCollectionImpl_IDirectMusicCollection_AddRef (LPDIRECTMUSICCOLLECTION iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, CollectionVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
}

static ULONG WINAPI IDirectMusicCollectionImpl_IDirectMusicCollection_Release (LPDIRECTMUSICCOLLECTION iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, CollectionVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_Release ((LPUNKNOWN)&This->UnknownVtbl);
}

/* IDirectMusicCollection Interface follow: */
static HRESULT WINAPI IDirectMusicCollectionImpl_IDirectMusicCollection_GetInstrument (LPDIRECTMUSICCOLLECTION iface, DWORD dwPatch, IDirectMusicInstrument** ppInstrument) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, CollectionVtbl, iface);
      DMUS_PRIVATE_INSTRUMENTENTRY *tmpEntry;
      struct list *listEntry;
      DWORD dwInstPatch;

      TRACE("(%p, %d, %p)\n", This, dwPatch, ppInstrument);
      
      LIST_FOR_EACH (listEntry, &This->Instruments) {
            tmpEntry = LIST_ENTRY(listEntry, DMUS_PRIVATE_INSTRUMENTENTRY, entry);
            IDirectMusicInstrument_GetPatch (tmpEntry->pInstrument, &dwInstPatch);
            if (dwPatch == dwInstPatch) {
                  *ppInstrument = tmpEntry->pInstrument;
                  IDirectMusicInstrument_AddRef (tmpEntry->pInstrument);
                  IDirectMusicInstrumentImpl_Custom_Load (tmpEntry->pInstrument, This->pStm); /* load instrument before returning it */
                  TRACE(": returning instrument %p\n", *ppInstrument);
                  return S_OK;
            }
                  
      }
      TRACE(": instrument not found\n");
      
      return DMUS_E_INVALIDPATCH;
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IDirectMusicCollection_EnumInstrument (LPDIRECTMUSICCOLLECTION iface, DWORD dwIndex, DWORD* pdwPatch, LPWSTR pwszName, DWORD dwNameLen) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, CollectionVtbl, iface);
      unsigned int r = 0;
      DMUS_PRIVATE_INSTRUMENTENTRY *tmpEntry;
      struct list *listEntry;
       DWORD dwLen;
            
      TRACE("(%p, %d, %p, %p, %d)\n", This, dwIndex, pdwPatch, pwszName, dwNameLen);
      LIST_FOR_EACH (listEntry, &This->Instruments) {
            tmpEntry = LIST_ENTRY(listEntry, DMUS_PRIVATE_INSTRUMENTENTRY, entry);
            if (r == dwIndex) {
                  ICOM_NAME_MULTI (IDirectMusicInstrumentImpl, InstrumentVtbl, tmpEntry->pInstrument, pInstrument);
                  IDirectMusicInstrument_GetPatch (tmpEntry->pInstrument, pdwPatch);
                       if (pwszName) {
                               dwLen = min(strlenW(pInstrument->wszName),dwNameLen-1);
                               memcpy (pwszName, pInstrument->wszName, dwLen * sizeof(WCHAR));
                               pwszName[dwLen] = '\0';
                       }
                  return S_OK;
            }
            r++;        
      }
      
      return S_FALSE;
}

static const IDirectMusicCollectionVtbl DirectMusicCollection_Collection_Vtbl = {
      IDirectMusicCollectionImpl_IDirectMusicCollection_QueryInterface,
      IDirectMusicCollectionImpl_IDirectMusicCollection_AddRef,
      IDirectMusicCollectionImpl_IDirectMusicCollection_Release,
      IDirectMusicCollectionImpl_IDirectMusicCollection_GetInstrument,
      IDirectMusicCollectionImpl_IDirectMusicCollection_EnumInstrument
};

/* IDirectMusicCollectionImpl IDirectMusicObject part: */
static HRESULT WINAPI IDirectMusicCollectionImpl_IDirectMusicObject_QueryInterface (LPDIRECTMUSICOBJECT iface, REFIID riid, LPVOID *ppobj) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, ObjectVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_QueryInterface ((LPUNKNOWN)&This->UnknownVtbl, riid, ppobj);
}

static ULONG WINAPI IDirectMusicCollectionImpl_IDirectMusicObject_AddRef (LPDIRECTMUSICOBJECT iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, ObjectVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
}

static ULONG WINAPI IDirectMusicCollectionImpl_IDirectMusicObject_Release (LPDIRECTMUSICOBJECT iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, ObjectVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_Release ((LPUNKNOWN)&This->UnknownVtbl);
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IDirectMusicObject_GetDescriptor (LPDIRECTMUSICOBJECT iface, LPDMUS_OBJECTDESC pDesc) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, ObjectVtbl, iface);
      TRACE("(%p, %p)\n", This, pDesc);
      /* I think we shouldn't return pointer here since then values can be changed; it'd be a mess */
      memcpy (pDesc, This->pDesc, This->pDesc->dwSize);
      return S_OK;
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IDirectMusicObject_SetDescriptor (LPDIRECTMUSICOBJECT iface, LPDMUS_OBJECTDESC pDesc) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, ObjectVtbl, iface);
      TRACE("(%p, %p): setting descriptor:\n%s\n", This, pDesc, debugstr_DMUS_OBJECTDESC (pDesc));

      /* According to MSDN, we should copy only given values, not whole struct */   
      if (pDesc->dwValidData & DMUS_OBJ_OBJECT)
            This->pDesc->guidObject = pDesc->guidObject;
      if (pDesc->dwValidData & DMUS_OBJ_CLASS)
            This->pDesc->guidClass = pDesc->guidClass;
      if (pDesc->dwValidData & DMUS_OBJ_NAME)
               lstrcpynW(This->pDesc->wszName, pDesc->wszName, DMUS_MAX_NAME);
      if (pDesc->dwValidData & DMUS_OBJ_CATEGORY)
               lstrcpynW(This->pDesc->wszCategory, pDesc->wszCategory, DMUS_MAX_CATEGORY);
      if (pDesc->dwValidData & DMUS_OBJ_FILENAME)
               lstrcpynW(This->pDesc->wszFileName, pDesc->wszFileName, DMUS_MAX_FILENAME);
      if (pDesc->dwValidData & DMUS_OBJ_VERSION)
            This->pDesc->vVersion = pDesc->vVersion;
      if (pDesc->dwValidData & DMUS_OBJ_DATE)
            This->pDesc->ftDate = pDesc->ftDate;
      if (pDesc->dwValidData & DMUS_OBJ_MEMORY) {
            memcpy (&This->pDesc->llMemLength, &pDesc->llMemLength, sizeof (pDesc->llMemLength));                       
            memcpy (This->pDesc->pbMemData, pDesc->pbMemData, sizeof (pDesc->pbMemData));
      }
      if (pDesc->dwValidData & DMUS_OBJ_STREAM) {
            /* according to MSDN, we copy the stream */
            IStream_Clone (pDesc->pStream, &This->pDesc->pStream);      
      }
      
      /* add new flags */
      This->pDesc->dwValidData |= pDesc->dwValidData;

      return S_OK;
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IDirectMusicObject_ParseDescriptor (LPDIRECTMUSICOBJECT iface, LPSTREAM pStream, LPDMUS_OBJECTDESC pDesc) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, ObjectVtbl, iface);
      DMUS_PRIVATE_CHUNK Chunk;
      DWORD StreamSize, StreamCount, ListSize[1], ListCount[1];
      LARGE_INTEGER liMove; /* used when skipping chunks */

      TRACE("(%p, %p, %p)\n", This, pStream, pDesc);

      /* FIXME: should this be determined from stream? */
      pDesc->dwValidData |= DMUS_OBJ_CLASS;
      pDesc->guidClass = CLSID_DirectMusicCollection;

      IStream_Read (pStream, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
      TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
      switch (Chunk.fccID) {  
            case FOURCC_RIFF: {
                  IStream_Read (pStream, &Chunk.fccID, sizeof(FOURCC), NULL);                   
                  TRACE_(dmfile)(": RIFF chunk of type %s", debugstr_fourcc(Chunk.fccID));
                  StreamSize = Chunk.dwSize - sizeof(FOURCC);
                  StreamCount = 0;
                  if (Chunk.fccID == mmioFOURCC('D','L','S',' ')) {
                        TRACE_(dmfile)(": collection form\n");
                        do {
                              IStream_Read (pStream, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                              StreamCount += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                              TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                              switch (Chunk.fccID) {
                                    case FOURCC_DLID: {
                                          TRACE_(dmfile)(": GUID chunk\n");
                                          pDesc->dwValidData |= DMUS_OBJ_OBJECT;
                                          IStream_Read (pStream, &pDesc->guidObject, Chunk.dwSize, NULL);
                                          break;
                                    }
                                    case DMUS_FOURCC_VERSION_CHUNK: {
                                          TRACE_(dmfile)(": version chunk\n");
                                          pDesc->dwValidData |= DMUS_OBJ_VERSION;
                                          IStream_Read (pStream, &pDesc->vVersion, Chunk.dwSize, NULL);
                                          break;
                                    }
                                    case DMUS_FOURCC_CATEGORY_CHUNK: {
                                          TRACE_(dmfile)(": category chunk\n");
                                          pDesc->dwValidData |= DMUS_OBJ_CATEGORY;
                                          IStream_Read (pStream, pDesc->wszCategory, Chunk.dwSize, NULL);
                                          break;
                                    }
                                    case FOURCC_LIST: {
                                          IStream_Read (pStream, &Chunk.fccID, sizeof(FOURCC), NULL);                   
                                          TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
                                          ListSize[0] = Chunk.dwSize - sizeof(FOURCC);
                                          ListCount[0] = 0;
                                          switch (Chunk.fccID) {
                                                /* pure INFO list, such can be found in dls collections */
                                                case mmioFOURCC('I','N','F','O'): {
                                                      TRACE_(dmfile)(": INFO list\n");
                                                      do {
                                                            IStream_Read (pStream, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                                                            ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                                                            TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                                                            switch (Chunk.fccID) {
                                                                  case mmioFOURCC('I','N','A','M'):{
                                                                        CHAR szName[DMUS_MAX_NAME];                                                                     
                                                                        TRACE_(dmfile)(": name chunk\n");
                                                                        pDesc->dwValidData |= DMUS_OBJ_NAME;
                                                                        IStream_Read (pStream, szName, Chunk.dwSize, NULL);
                                                                        MultiByteToWideChar (CP_ACP, 0, szName, -1, pDesc->wszName, DMUS_MAX_NAME);
                                                                        if (even_or_odd(Chunk.dwSize)) {
                                                                              ListCount[0] ++;
                                                                              liMove.QuadPart = 1;
                                                                              IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                                                        }
                                                                        break;
                                                                  }
                                                                  case mmioFOURCC('I','A','R','T'): {
                                                                        TRACE_(dmfile)(": artist chunk (ignored)\n");
                                                                        if (even_or_odd(Chunk.dwSize)) {
                                                                              ListCount[0] ++;
                                                                              Chunk.dwSize++;
                                                                        }
                                                                        liMove.QuadPart = Chunk.dwSize;
                                                                        IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                                                        break;
                                                                  }
                                                                  case mmioFOURCC('I','C','O','P'): {
                                                                        TRACE_(dmfile)(": copyright chunk (ignored)\n");
                                                                        if (even_or_odd(Chunk.dwSize)) {
                                                                              ListCount[0] ++;
                                                                              Chunk.dwSize++;
                                                                        }
                                                                        liMove.QuadPart = Chunk.dwSize;
                                                                        IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                                                        break;
                                                                  }
                                                                  case mmioFOURCC('I','S','B','J'): {
                                                                        TRACE_(dmfile)(": subject chunk (ignored)\n");
                                                                        if (even_or_odd(Chunk.dwSize)) {
                                                                              ListCount[0] ++;
                                                                              Chunk.dwSize++;
                                                                        }
                                                                        liMove.QuadPart = Chunk.dwSize;
                                                                        IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                                                        break;
                                                                  }
                                                                  case mmioFOURCC('I','C','M','T'): {
                                                                        TRACE_(dmfile)(": comment chunk (ignored)\n");
                                                                        if (even_or_odd(Chunk.dwSize)) {
                                                                              ListCount[0] ++;
                                                                              Chunk.dwSize++;
                                                                        }
                                                                        liMove.QuadPart = Chunk.dwSize;
                                                                        IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                                                        break;
                                                                  }
                                                                  default: {
                                                                        TRACE_(dmfile)(": unknown chunk (irrevelant & skipping)\n");
                                                                        if (even_or_odd(Chunk.dwSize)) {
                                                                              ListCount[0] ++;
                                                                              Chunk.dwSize++;
                                                                        }
                                                                        liMove.QuadPart = Chunk.dwSize;
                                                                        IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                                                        break;                                    
                                                                  }
                                                            }
                                                            TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
                                                      } while (ListCount[0] < ListSize[0]);
                                                      break;
                                                }
                                                default: {
                                                      TRACE_(dmfile)(": unknown (skipping)\n");
                                                      liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
                                                      IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                                      break;                                    
                                                }
                                          }
                                          break;
                                    }     
                                    default: {
                                          TRACE_(dmfile)(": unknown chunk (irrevelant & skipping)\n");
                                          liMove.QuadPart = Chunk.dwSize;
                                          IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
                                          break;                                    
                                    }
                              }
                              TRACE_(dmfile)(": StreamCount[0] = %d < StreamSize[0] = %d\n", StreamCount, StreamSize);
                        } while (StreamCount < StreamSize);
                  } else {
                        TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
                        liMove.QuadPart = StreamSize;
                        IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
                        return E_FAIL;
                  }
            
                  TRACE_(dmfile)(": reading finished\n");
                  break;
            }
            default: {
                  TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
                  liMove.QuadPart = Chunk.dwSize;
                  IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
                  return DMUS_E_INVALIDFILE;
            }
      }     
      
      TRACE(": returning descriptor:\n%s\n", debugstr_DMUS_OBJECTDESC (pDesc));
      
      return S_OK;
}

static const IDirectMusicObjectVtbl DirectMusicCollection_Object_Vtbl = {
      IDirectMusicCollectionImpl_IDirectMusicObject_QueryInterface,
      IDirectMusicCollectionImpl_IDirectMusicObject_AddRef,
      IDirectMusicCollectionImpl_IDirectMusicObject_Release,
      IDirectMusicCollectionImpl_IDirectMusicObject_GetDescriptor,
      IDirectMusicCollectionImpl_IDirectMusicObject_SetDescriptor,
      IDirectMusicCollectionImpl_IDirectMusicObject_ParseDescriptor
};

/* IDirectMusicCollectionImpl IPersistStream part: */
static HRESULT WINAPI IDirectMusicCollectionImpl_IPersistStream_QueryInterface (LPPERSISTSTREAM iface, REFIID riid, LPVOID *ppobj) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, PersistStreamVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_QueryInterface ((LPUNKNOWN)&This->UnknownVtbl, riid, ppobj);
}

static ULONG WINAPI IDirectMusicCollectionImpl_IPersistStream_AddRef (LPPERSISTSTREAM iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, PersistStreamVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
}

static ULONG WINAPI IDirectMusicCollectionImpl_IPersistStream_Release (LPPERSISTSTREAM iface) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, PersistStreamVtbl, iface);
      return IDirectMusicCollectionImpl_IUnknown_Release ((LPUNKNOWN)&This->UnknownVtbl);
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IPersistStream_GetClassID (LPPERSISTSTREAM iface, CLSID* pClassID) {
      return E_NOTIMPL;
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IPersistStream_IsDirty (LPPERSISTSTREAM iface) {
      return E_NOTIMPL;
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IPersistStream_Load (LPPERSISTSTREAM iface, IStream* pStm) {
      ICOM_THIS_MULTI(IDirectMusicCollectionImpl, PersistStreamVtbl, iface);

      DMUS_PRIVATE_CHUNK Chunk;
      DWORD StreamSize, StreamCount, ListSize[3], ListCount[3];
      LARGE_INTEGER liMove; /* used when skipping chunks */
      ULARGE_INTEGER dlibCollectionPosition, dlibInstrumentPosition, dlibWavePoolPosition;
      
      IStream_AddRef (pStm); /* add count for later references */
      liMove.QuadPart = 0;
      IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, &dlibCollectionPosition); /* store offset, in case it'll be needed later */
      This->liCollectionPosition.QuadPart = dlibCollectionPosition.QuadPart;
      This->pStm = pStm;
      
      IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
      TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
      switch (Chunk.fccID) {  
            case FOURCC_RIFF: {
                  IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);                      
                  TRACE_(dmfile)(": RIFF chunk of type %s", debugstr_fourcc(Chunk.fccID));
                  StreamSize = Chunk.dwSize - sizeof(FOURCC);
                  StreamCount = 0;
                  switch (Chunk.fccID) {
                        case FOURCC_DLS: {
                              TRACE_(dmfile)(": collection form\n");
                              do {
                                    IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                                    StreamCount += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                                    TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                                    switch (Chunk.fccID) {
                                          case FOURCC_COLH: {
                                                TRACE_(dmfile)(": collection header chunk\n");
                                                This->pHeader = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, Chunk.dwSize);
                                                IStream_Read (pStm, This->pHeader, Chunk.dwSize, NULL);
                                                break;                                                
                                          }
                                          case FOURCC_DLID: {
                                                TRACE_(dmfile)(": DLID (GUID) chunk\n");
                                                This->pDesc->dwValidData |= DMUS_OBJ_OBJECT;
                                                IStream_Read (pStm, &This->pDesc->guidObject, Chunk.dwSize, NULL);
                                                break;
                                          }
                                          case FOURCC_VERS: {
                                                TRACE_(dmfile)(": version chunk\n");
                                                This->pDesc->dwValidData |= DMUS_OBJ_VERSION;
                                                IStream_Read (pStm, &This->pDesc->vVersion, Chunk.dwSize, NULL);
                                                break;
                                          }
                                          case FOURCC_PTBL: {
                                                TRACE_(dmfile)(": pool table chunk\n");
                                                This->pPoolTable = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(POOLTABLE));
                                                IStream_Read (pStm, This->pPoolTable, sizeof(POOLTABLE), NULL);
                                                Chunk.dwSize -= sizeof(POOLTABLE);
                                                This->pPoolCues = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, This->pPoolTable->cCues*sizeof(POOLCUE));
                                                IStream_Read (pStm, This->pPoolCues, Chunk.dwSize, NULL);
                                                break;
                                          }
                                          case FOURCC_LIST: {
                                                IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);                      
                                                TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
                                                ListSize[0] = Chunk.dwSize - sizeof(FOURCC);
                                                ListCount[0] = 0;
                                                switch (Chunk.fccID) {
                                                      case mmioFOURCC('I','N','F','O'): {
                                                            TRACE_(dmfile)(": INFO list\n");
                                                            do {
                                                                  IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                                                                  ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                                                                  TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                                                                  switch (Chunk.fccID) {
                                                                        case mmioFOURCC('I','N','A','M'): {
                                                                              CHAR szName[DMUS_MAX_NAME];
                                                                              TRACE_(dmfile)(": name chunk\n");
                                                                              This->pDesc->dwValidData |= DMUS_OBJ_NAME;
                                                                              IStream_Read (pStm, szName, Chunk.dwSize, NULL);
                                                                              MultiByteToWideChar (CP_ACP, 0, szName, -1, This->pDesc->wszName, DMUS_MAX_NAME);
                                                                              if (even_or_odd(Chunk.dwSize)) {
                                                                                    ListCount[0] ++;
                                                                                    liMove.QuadPart = 1;
                                                                                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                              }
                                                                              break;
                                                                        }
                                                                        case mmioFOURCC('I','A','R','T'): {
                                                                              TRACE_(dmfile)(": artist chunk (ignored)\n");
                                                                              if (even_or_odd(Chunk.dwSize)) {
                                                                                    ListCount[0] ++;
                                                                                    Chunk.dwSize++;
                                                                              }
                                                                              liMove.QuadPart = Chunk.dwSize;
                                                                              IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                              break;
                                                                        }
                                                                        case mmioFOURCC('I','C','O','P'): {
                                                                              TRACE_(dmfile)(": copyright chunk\n");
                                                                              This->szCopyright = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, Chunk.dwSize);
                                                                              IStream_Read (pStm, This->szCopyright, Chunk.dwSize, NULL);
                                                                              if (even_or_odd(Chunk.dwSize)) {
                                                                                    ListCount[0] ++;
                                                                                    liMove.QuadPart = 1;
                                                                                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                              }
                                                                              break;
                                                                        }
                                                                        case mmioFOURCC('I','S','B','J'): {
                                                                              TRACE_(dmfile)(": subject chunk (ignored)\n");
                                                                              if (even_or_odd(Chunk.dwSize)) {
                                                                                    ListCount[0] ++;
                                                                                    Chunk.dwSize++;
                                                                              }
                                                                              liMove.QuadPart = Chunk.dwSize;
                                                                              IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                              break;
                                                                        }
                                                                        case mmioFOURCC('I','C','M','T'): {
                                                                              TRACE_(dmfile)(": comment chunk (ignored)\n");
                                                                              if (even_or_odd(Chunk.dwSize)) {
                                                                                    ListCount[0] ++;
                                                                                    Chunk.dwSize++;
                                                                              }
                                                                              liMove.QuadPart = Chunk.dwSize;
                                                                              IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                              break;
                                                                        }
                                                                        default: {
                                                                              TRACE_(dmfile)(": unknown chunk (irrevelant & skipping)\n");
                                                                              if (even_or_odd(Chunk.dwSize)) {
                                                                                    ListCount[0] ++;
                                                                                    Chunk.dwSize++;
                                                                              }
                                                                              liMove.QuadPart = Chunk.dwSize;
                                                                              IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                              break;                                    
                                                                        }
                                                                  }
                                                                  TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
                                                            } while (ListCount[0] < ListSize[0]);
                                                            break;
                                                      }
                                                      case FOURCC_WVPL: {
                                                            TRACE_(dmfile)(": wave pool list (mark & skip)\n");
                                                            liMove.QuadPart = 0;
                                                            IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, &dlibWavePoolPosition); /* store position */
                                                            This->liWavePoolTablePosition.QuadPart = dlibWavePoolPosition.QuadPart;
                                                            liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
                                                            IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                            break;      
                                                      }
                                                      case FOURCC_LINS: {
                                                            TRACE_(dmfile)(": instruments list\n");
                                                            do {
                                                                  IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                                                                  ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                                                                  TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                                                                  switch (Chunk.fccID) {
                                                                        case FOURCC_LIST: {
                                                                              IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);                      
                                                                              TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
                                                                              ListSize[1] = Chunk.dwSize - sizeof(FOURCC);
                                                                              ListCount[1] = 0;                                                                         
                                                                              switch (Chunk.fccID) {
                                                                                    case FOURCC_INS: {
                                                                                          LPDMUS_PRIVATE_INSTRUMENTENTRY pNewInstrument = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_INSTRUMENTENTRY));
                                                                                          TRACE_(dmfile)(": instrument list\n");
                                                                                          DMUSIC_CreateDirectMusicInstrumentImpl (&IID_IDirectMusicInstrument, (LPVOID*)&pNewInstrument->pInstrument, NULL); /* only way to create this one... even M$ does it discretely */
                                                                                                                        {
                                                                                                                            ICOM_NAME_MULTI (IDirectMusicInstrumentImpl, InstrumentVtbl, pNewInstrument->pInstrument, pInstrument);
                                                                                                                            liMove.QuadPart = 0;
                                                                                                                            IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, &dlibInstrumentPosition);
                                                                                                                            pInstrument->liInstrumentPosition.QuadPart = dlibInstrumentPosition.QuadPart - (2*sizeof(FOURCC) + sizeof(DWORD)); /* store offset, it'll be needed later */

                                                                                                                            do {
                                                                                                IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                                                                                                ListCount[1] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                                                                                                TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                                                                                                switch (Chunk.fccID) {
                                                                                                      case FOURCC_INSH: {
                                                                                                            TRACE_(dmfile)(": instrument header chunk\n");
                                                                                                            pInstrument->pHeader = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, Chunk.dwSize);
                                                                                                            IStream_Read (pStm, pInstrument->pHeader, Chunk.dwSize, NULL);
                                                                                                            break;      
                                                                                                      }
                                                                                                      case FOURCC_DLID: {
                                                                                                            TRACE_(dmfile)(": DLID (GUID) chunk\n");
                                                                                                            pInstrument->pInstrumentID = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, Chunk.dwSize);
                                                                                                            IStream_Read (pStm, pInstrument->pInstrumentID, Chunk.dwSize, NULL);
                                                                                                            break;
                                                                                                      }
                                                                                                      case FOURCC_LIST: {
                                                                                                            IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);                      
                                                                                                            TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
                                                                                                            ListSize[2] = Chunk.dwSize - sizeof(FOURCC);
                                                                                                            ListCount[2] = 0;
                                                                                                            switch (Chunk.fccID) {
                                                                                                                  default: {
                                                                                                                        TRACE_(dmfile)(": unknown (skipping)\n");
                                                                                                                        liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
                                                                                                                        IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                                                                        break;                                    
                                                                                                                  }
                                                                                                            }
                                                                                                            break;
                                                                                                      }                       
                                                                                                      default: {
                                                                                                            TRACE_(dmfile)(": unknown chunk (irrevelant & skipping)\n");
                                                                                                            liMove.QuadPart = Chunk.dwSize;
                                                                                                            IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                                                            break;                                    
                                                                                                      }
                                                                                                }
                                                                                                TRACE_(dmfile)(": ListCount[1] = %d < ListSize[1] = %d\n", ListCount[1], ListSize[1]);
                                                                                                                            } while (ListCount[1] < ListSize[1]);
                                                                                                                            /* DEBUG: dumps whole instrument object tree: */
                                                                                                                            if (TRACE_ON(dmusic)) {
                                                                                                TRACE("*** IDirectMusicInstrument (%p) ***\n", pInstrument);
                                                                                                if (pInstrument->pInstrumentID)
                                                                                                      TRACE(" - GUID = %s\n", debugstr_dmguid(pInstrument->pInstrumentID));
                                                                                                
                                                                                                TRACE(" - Instrument header:\n");
                                                                                                TRACE("    - cRegions: %d\n", pInstrument->pHeader->cRegions);
                                                                                                TRACE("    - Locale:\n");
                                                                                                TRACE("       - ulBank: %d\n", pInstrument->pHeader->Locale.ulBank);
                                                                                                TRACE("       - ulInstrument: %d\n", pInstrument->pHeader->Locale.ulInstrument);
                                                                                                TRACE("       => dwPatch: %d\n", MIDILOCALE2Patch(&pInstrument->pHeader->Locale));
                                                                                                                            }
                                                                                                                            list_add_tail (&This->Instruments, &pNewInstrument->entry);
                                                                                                                        }
                                                                                          break;
                                                                                    }
                                                                              }
                                                                              break;
                                                                        }
                                                                        default: {
                                                                              TRACE_(dmfile)(": unknown chunk (irrevelant & skipping)\n");
                                                                              liMove.QuadPart = Chunk.dwSize;
                                                                              IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                                              break;                                    
                                                                        }
                                                                  }
                                                                  TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
                                                            } while (ListCount[0] < ListSize[0]);
                                                            break;
                                                      }
                                                      default: {
                                                            TRACE_(dmfile)(": unknown (skipping)\n");
                                                            liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
                                                            IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                            break;                                    
                                                      }
                                                }
                                                break;
                                          }     
                                          default: {
                                                TRACE_(dmfile)(": unknown chunk (irrevelant & skipping)\n");
                                                liMove.QuadPart = Chunk.dwSize;
                                                IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                break;                                    
                                          }
                                    }
                                    TRACE_(dmfile)(": StreamCount = %d < StreamSize = %d\n", StreamCount, StreamSize);
                              } while (StreamCount < StreamSize);
                              break;
                        }
                        default: {
                              TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
                              liMove.QuadPart = StreamSize;
                              IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
                              return E_FAIL;
                        }
                  }
                  TRACE_(dmfile)(": reading finished\n");
                  break;
            }
            default: {
                  TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
                  liMove.QuadPart = Chunk.dwSize;
                  IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
                  return E_FAIL;
            }
      }

      /* DEBUG: dumps whole collection object tree: */
      if (TRACE_ON(dmusic)) {
            int r = 0;
            DMUS_PRIVATE_INSTRUMENTENTRY *tmpEntry;
            struct list *listEntry;

            TRACE("*** IDirectMusicCollection (%p) ***\n", This->CollectionVtbl);
            if (This->pDesc->dwValidData & DMUS_OBJ_OBJECT)
                  TRACE(" - GUID = %s\n", debugstr_dmguid(&This->pDesc->guidObject));
            if (This->pDesc->dwValidData & DMUS_OBJ_VERSION)
                  TRACE(" - Version = %i,%i,%i,%i\n", (This->pDesc->vVersion.dwVersionMS >> 8) & 0x0000FFFF, This->pDesc->vVersion.dwVersionMS & 0x0000FFFF,
                        (This->pDesc->vVersion.dwVersionLS >> 8) & 0x0000FFFF, This->pDesc->vVersion.dwVersionLS & 0x0000FFFF);
            if (This->pDesc->dwValidData & DMUS_OBJ_NAME)
                  TRACE(" - Name = %s\n", debugstr_w(This->pDesc->wszName));
            
            TRACE(" - Collection header:\n");
            TRACE("    - cInstruments: %d\n", This->pHeader->cInstruments);
            TRACE(" - Instruments:\n");
            
            LIST_FOR_EACH (listEntry, &This->Instruments) {
                  tmpEntry = LIST_ENTRY( listEntry, DMUS_PRIVATE_INSTRUMENTENTRY, entry );
                  TRACE("    - Instrument[%i]: %p\n", r, tmpEntry->pInstrument);
                  r++;
            }
      }
      
      return S_OK;
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IPersistStream_Save (LPPERSISTSTREAM iface, IStream* pStm, BOOL fClearDirty) {
      return E_NOTIMPL;
}

static HRESULT WINAPI IDirectMusicCollectionImpl_IPersistStream_GetSizeMax (LPPERSISTSTREAM iface, ULARGE_INTEGER* pcbSize) {
      return E_NOTIMPL;
}

static const IPersistStreamVtbl DirectMusicCollection_PersistStream_Vtbl = {
      IDirectMusicCollectionImpl_IPersistStream_QueryInterface,
      IDirectMusicCollectionImpl_IPersistStream_AddRef,
      IDirectMusicCollectionImpl_IPersistStream_Release,
      IDirectMusicCollectionImpl_IPersistStream_GetClassID,
      IDirectMusicCollectionImpl_IPersistStream_IsDirty,
      IDirectMusicCollectionImpl_IPersistStream_Load,
      IDirectMusicCollectionImpl_IPersistStream_Save,
      IDirectMusicCollectionImpl_IPersistStream_GetSizeMax
};


/* for ClassFactory */
HRESULT WINAPI DMUSIC_CreateDirectMusicCollectionImpl (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) {
      IDirectMusicCollectionImpl* obj;
      
      obj = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicCollectionImpl));
      if (NULL == obj) {
            *ppobj = NULL;
            return E_OUTOFMEMORY;
      }
      obj->UnknownVtbl = &DirectMusicCollection_Unknown_Vtbl;
      obj->CollectionVtbl = &DirectMusicCollection_Collection_Vtbl;
      obj->ObjectVtbl = &DirectMusicCollection_Object_Vtbl;
      obj->PersistStreamVtbl = &DirectMusicCollection_PersistStream_Vtbl;
      obj->pDesc = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DMUS_OBJECTDESC));
      DM_STRUCT_INIT(obj->pDesc);
      obj->pDesc->dwValidData |= DMUS_OBJ_CLASS;
      obj->pDesc->guidClass = CLSID_DirectMusicCollection;
      obj->ref = 0; /* will be inited by QueryInterface */
      list_init (&obj->Instruments);

      return IDirectMusicCollectionImpl_IUnknown_QueryInterface ((LPUNKNOWN)&obj->UnknownVtbl, lpcGUID, ppobj);
}

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