riff.cpp
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上传日期:2013-07-19
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- /* ***** BEGIN LICENSE BLOCK *****
- * Source last modified: $Id: riff.cpp,v 1.5.8.2 2004/07/09 01:55:14 hubbe Exp $
- *
- * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file,
- * are subject to the current version of the RealNetworks Public
- * Source License (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the current version of the RealNetworks Community
- * Source License (the "RCSL") available at
- * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
- * will apply. You may also obtain the license terms directly from
- * RealNetworks. You may not use this file except in compliance with
- * the RPSL or, if you have a valid RCSL with RealNetworks applicable
- * to this file, the RCSL. Please see the applicable RPSL or RCSL for
- * the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL") in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your version of
- * this file only under the terms of the GPL, and not to allow others
- * to use your version of this file under the terms of either the RPSL
- * or RCSL, indicate your decision by deleting the provisions above
- * and replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient may
- * use your version of this file under the terms of any one of the
- * RPSL, the RCSL or the GPL.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the
- * portions it created.
- *
- * This file, and the files included with this file, is distributed
- * and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
- * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
- * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
- * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
- * ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #include "hlxclib/string.h"
- #include "hxtypes.h"
- #include "hxcom.h"
- #include "hxmarsh.h"
- #include "ihxpckts.h"
- #include "hxfiles.h"
- #include "riff.h"
- #include "riffres.h"
- #include "hxassert.h"
- #include "hxcomm.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- #define LIST_CHUNK_ID 0x4c495354 /* 'LIST' */
- #define IFF_FILE_MAGIC_NUMBER 0x464f524d /* 'FORM' */
- STDMETHODIMP CRIFFReader::QueryInterface(REFIID riid, void** ppvObj)
- {
- QInterfaceList qiList[] =
- {
- { GET_IIDHANDLE(IID_IUnknown), this},
- { GET_IIDHANDLE(IID_IHXFileResponse), (IHXFileResponse*)this},
- { GET_IIDHANDLE(IID_IHXThreadSafeMethods), (IHXThreadSafeMethods*)this},
- };
- HX_RESULT retVal = ::QIFind(qiList, QILISTSIZE(qiList), riid, ppvObj);
- if (FAILED(retVal) && m_pResponse)
- {
- retVal = m_pResponse->QueryInterface(riid, ppvObj);
- }
- return retVal;
- }
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::AddRef
- // Purpose:
- // Everyone usually implements this the same... feel free to use
- // this implementation.
- //
- STDMETHODIMP_(ULONG32) CRIFFReader::AddRef()
- {
- return InterlockedIncrement(&m_lRefCount);
- }
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::Release
- // Purpose:
- // Everyone usually implements this the same... feel free to use
- // this implementation.
- //
- STDMETHODIMP_(ULONG32) CRIFFReader::Release()
- {
- if ( InterlockedDecrement(&m_lRefCount) > 0 )
- {
- return m_lRefCount;
- }
- delete this;
- return 0;
- }
- CRIFFReader::CRIFFReader(IUnknown* pContext,
- CRIFFResponse* pResponse,
- IHXFileObject* pFileObject)
- : m_pReassemblyBuffer(NULL)
- , m_ulChunkBytesRead(0)
- , m_ulChunkSize(0)
- {
- m_pContext = pContext;
- m_pResponse = pResponse;
- m_pFileObject = pFileObject;
- if ( m_pFileObject )
- {
- m_pFileObject->AddRef();
- }
- if ( m_pContext )
- m_pContext->AddRef();
- if ( m_pResponse )
- m_pResponse->AddRef();
- m_bFileIsOpen = FALSE;
- m_lRefCount = 0;
- m_pFilename = 0;
- m_ulSizeDiff = 0;
- m_ulThisChunkOffset = 0;
- //Every time we Read() a data chunk and the amount of the Read is
- // odd, we add one to byte-align for the next Read, but we want to
- // know that we did this in ReadDone() so we use the following to
- // keep track so, in ReadDone(), we can reduce the buffer size by
- // one if necessary so the renderer will get just the bytes it
- // needs:
- m_ulFileSpecifiedReadSize = 0;
- }
- CRIFFReader::~CRIFFReader()
- {
- if ( m_bFileIsOpen )
- Close();
- if ( m_pFilename )
- {
- delete [] m_pFilename;
- m_pFilename = 0;
- }
- }
- HX_RESULT
- CRIFFReader::Open(char* filename)
- {
- if ( !m_pFileObject )
- return HXR_UNEXPECTED;
- if ( filename )
- {
- m_pFilename = new char[strlen(filename) + 1];
- strcpy(m_pFilename, filename); /* Flawfinder: ignore */
- }
- m_state = RS_InitPending;
- m_ulCurOffset = 0;
- m_levelInfo[0].m_startOffset = 0;
- m_ulLevel = 0;
- /*
- if(filename)
- {
- IHXRequest* pRequest;
- if (m_pFileObject->GetRequest(pRequest) == HXR_OK)
- {
- pRequest->SetURL(filename);
- pRequest->Release();
- }
- else
- {
- return HXR_FAILED;
- }
- }
- */
- return m_pFileObject->Init(HX_FILE_READ | HX_FILE_BINARY, this);
- // return HXR_OK;
- }
- STDMETHODIMP
- CRIFFReader::InitDone(HX_RESULT status)
- {
- if ( status != HXR_OK )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFOpenDone(status);
- return HXR_OK;
- }
- m_bFileIsOpen = TRUE;
- m_state = RS_GetFileTypePending;
- return m_pFileObject->Read(sizeof(UINT32) * 2);
- }
- HX_RESULT
- CRIFFReader::Close()
- {
- if ( m_pFileObject )
- {
- m_pFileObject->Close();
- m_pFileObject->Release();
- m_pFileObject = NULL;
- }
- if ( m_pContext )
- {
- m_pContext->Release();
- m_pContext = NULL;
- }
- if ( m_pResponse )
- {
- m_pResponse->Release();
- m_pResponse = NULL;
- }
- m_bFileIsOpen = FALSE;
- return HXR_OK;
- }
- HX_RESULT
- CRIFFReader::FindChunk(UINT32 id, BOOL bRelative)
- {
- m_ulFindChunkId = id;
- m_state = RS_FileStartSeekPending;
- if ( bRelative && m_levelInfo[m_ulLevel].started )
- m_ulSeekOffset = m_levelInfo[m_ulLevel].m_nextChunkOffset;
- else
- m_ulSeekOffset = m_levelInfo[m_ulLevel].m_startOffset;
- m_levelInfo[m_ulLevel].started = TRUE;
- return(m_pFileObject->Seek(m_ulSeekOffset, FALSE) );
- }
- HX_RESULT
- CRIFFReader::GetChunk()
- {
- m_state = RS_ReadChunkHeaderPending;
- return(m_pFileObject->Read(sizeof(UINT32) * 2) ); /* Get type and len */
- }
- STDMETHODIMP
- CRIFFReader::ReadDone(HX_RESULT status, IHXBuffer* pBuffer)
- {
- UCHAR* buf;
- UINT32 len;
- UINT16 uRem = 0;
- HX_RESULT result = HXR_OK;
- if ( !m_pResponse )
- return HXR_FAIL;
- if ( pBuffer )
- pBuffer->Get(buf, len);
- m_ulCurOffset += len;
- //Keep track of "bytes read" value so CRIFFReader::ReadDone()
- // can know whether or not it needs to decrement by one the size
- // of the buffer it passes off, since some codecs (Intel's ILVC,
- // for one) allow for odd numbered video frame sizes:
- UINT32 ulActualLenOfBuffToUse = len;
- if ( RS_ReadChunkBodyPending == m_state && pBuffer )
- {
- ulActualLenOfBuffToUse = m_ulFileSpecifiedReadSize;
- if ( len > ulActualLenOfBuffToUse &&
- len - ulActualLenOfBuffToUse == 1 )
- {
- //Then a Read(n+1) was done becuase n was odd, so
- // make sure buffer has size of n so renderer will
- // get just the bytes it needs:
- pBuffer->SetSize(ulActualLenOfBuffToUse);
- }
- }
- if ( m_ulFileType == RIFF_FILE_MAGIC_NUMBER ||
- m_ulFileType == IFF_FILE_MAGIC_NUMBER )
- {
- // Make sure the offset is aligned(2 bytes)
- uRem = (UINT16)(m_ulCurOffset % 2);
- if ( uRem != 0 )
- {
- m_ulCurOffset += 1;
- }
- }
- switch ( m_state )
- {
- case RS_GetFileTypePending:
- if ( len != sizeof(UINT32) * 2 )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFOpenDone(HXR_FAILED);
- return HXR_UNEXPECTED;
- }
- if ( (UINT32)getlong(buf) == RIFF_FILE_MAGIC_NUMBER )
- {
- m_state = RS_GetActualFileTypePending;
- m_ulFileType = RIFF_FILE_MAGIC_NUMBER;
- m_bLittleEndian = TRUE;
- m_ulChunkBodyLen = GetLong(&buf[4]);
- m_ulSizeDiff = 0;
- m_levelInfo[m_ulLevel].m_nextChunkOffset = m_ulCurOffset + m_ulChunkBodyLen;
- m_pFileObject->Read(sizeof(UINT32));
- return status;
- }
- else if ( (UINT32)getlong(buf) == IFF_FILE_MAGIC_NUMBER )
- {
- m_state = RS_GetActualFileTypePending;
- m_ulFileType = IFF_FILE_MAGIC_NUMBER;
- m_bLittleEndian = FALSE;
- m_ulChunkBodyLen = GetLong(&buf[4]);
- m_ulSizeDiff = 0;
- m_levelInfo[m_ulLevel].m_nextChunkOffset = m_ulCurOffset + m_ulChunkBodyLen;
- m_levelInfo[m_ulLevel].m_startOffset = 12;
- m_pFileObject->Read(sizeof(UINT32));
- return status;
- }
- else
- {
- m_ulFileType = (UINT32)getlong(buf);
- m_bLittleEndian = FALSE;
- m_ulChunkBodyLen = GetLong(&buf[4]);
- m_ulSizeDiff = 8;
- m_levelInfo[m_ulLevel].m_nextChunkOffset = m_ulCurOffset + m_ulChunkBodyLen - 8;
- }
- m_state = RS_Ready;
- result = m_pResponse->RIFFOpenDone(status);
- return(HXR_OK==status? result:status);
- case RS_GetActualFileTypePending:
- if ( len != sizeof(UINT32) )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFOpenDone(HXR_FAILED);
- return HXR_UNEXPECTED;
- }
- m_ulSubFileType = (UINT32)GetLong(buf);
- m_state = RS_Ready;
- result = m_pResponse->RIFFOpenDone(status);
- return(HXR_OK==status? result:status);
- case RS_ChunkHeaderReadPending:
- if ( len != sizeof(UINT32) + sizeof(UINT32) ||
- (HXR_OK != status) )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFFindChunkDone(HXR_FAILED, 0);
- return HXR_UNEXPECTED;
- }
- if ( (UINT32)getlong(buf) == m_ulFindChunkId )
- {
- // Found the chunk we were asked for
- m_state = RS_Ready;
- m_ulChunkBodyLen = GetLong(&buf[4]);
- // Make sure the body length is aligned(2 bytes)
- if ( m_ulFileType == RIFF_FILE_MAGIC_NUMBER )
- {
- uRem = (UINT16)(m_ulChunkBodyLen % 2);
- if ( uRem != 0 )
- {
- m_ulChunkBodyLen += 1;
- }
- }
- m_levelInfo[m_ulLevel].m_nextChunkOffset = m_ulCurOffset + m_ulChunkBodyLen;
- m_ulThisChunkOffset = m_ulCurOffset;
- m_levelInfo[m_ulLevel].m_nextChunkOffset -= m_ulSizeDiff;
- m_ulChunkType = m_ulFindChunkId;
- if ( m_ulFindChunkId == LIST_CHUNK_ID )
- {
- m_state = RS_GetListTypePending;
- m_pFileObject->Read(sizeof(UINT32));
- }
- else
- {
- m_state = RS_Ready;
- m_pResponse->RIFFFindChunkDone(status,
- m_ulChunkBodyLen - m_ulSizeDiff);
- }
- return status;
- }
- else
- {
- // Didn't find it, go to the next chunk.
- m_state = RS_ChunkBodySeekPending;
- m_ulSeekOffset = m_ulCurOffset + GetLong(&buf[4]);
- /* Are we at the end of .rm file */
- if ( m_ulSeekOffset == m_ulCurOffset &&
- m_ulFileType != RIFF_FILE_MAGIC_NUMBER &&
- m_ulFileType != IFF_FILE_MAGIC_NUMBER )
- {
- m_pResponse->RIFFFindChunkDone(HXR_FAILED, 0);
- return HXR_OK;
- }
- if ( m_ulFileType == RIFF_FILE_MAGIC_NUMBER ||
- m_ulFileType == IFF_FILE_MAGIC_NUMBER )
- {
- // Make sure the seek offset is aligned(2 bytes)
- uRem = (UINT16)(m_ulSeekOffset % 2);
- if ( uRem != 0 )
- {
- m_ulSeekOffset += 1;
- }
- }
- m_ulSeekOffset -= m_ulSizeDiff;
- if ( m_ulSeekOffset == m_ulCurOffset )
- {
- m_state = RS_ChunkHeaderReadPending;
- return m_pFileObject->Read(sizeof(UINT32) * 2);
- }
- m_state = RS_ChunkBodySeekPending;
- return m_pFileObject->Seek(m_ulSeekOffset, FALSE);
- }
- case RS_GetListTypePending:
- if ( len != sizeof(UINT32) )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFFindChunkDone(HXR_FAILED, 0);
- return HXR_UNEXPECTED;
- }
- m_ulChunkSubType = getlong(buf);
- m_state = RS_Ready;
- m_pResponse->RIFFFindChunkDone(status, m_ulChunkBodyLen);
- return HXR_OK;
- case RS_ReadChunkHeaderPending:
- {
- if ( HXR_OK != status )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFGetChunkDone(HXR_FAILED, 0, NULL);
- return HXR_OK;
- }
- m_ulGetChunkType = (UINT32)getlong(buf);
- m_state = RS_ReadChunkBodyPending;
- LONG32 baseLen = GetLong(&buf[4]);
- if ( (m_ulFileType == RIFF_FILE_MAGIC_NUMBER) &&
- (m_ulGetChunkType == (UINT32)0) )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFGetChunkDone(HXR_FAILED, 0, NULL);
- return HXR_OK;
- }
- if ( baseLen == 0 )
- {
- m_state = RS_Ready;
- m_pResponse->RIFFGetChunkDone(HXR_OK, m_ulGetChunkType, NULL);
- return HXR_OK;
- }
- HX_RESULT resultOfRead = HXR_OK;
- #ifdef CHUNK_READ_SIZE_LIMIT
- // If the chunk is greater than MAX_READ_SIZE, we break the
- // read into smaller portions to improve performance under the
- // Simple File System:
- if (baseLen > MAX_READ_SIZE)
- {
- IHXCommonClassFactory* pClassFactory = NULL;
- if (m_pContext && SUCCEEDED(m_pContext->QueryInterface(IID_IHXCommonClassFactory,
- (void**) &pClassFactory)))
- {
- pClassFactory->CreateInstance(IID_IHXBuffer, (void**) &m_pReassemblyBuffer);
- }
- if (m_pReassemblyBuffer)
- {
- m_pReassemblyBuffer->SetSize(baseLen);
- m_ulChunkBytesRead = 0;
- m_ulChunkSize = baseLen;
- // Here we munge baselen in the interests of code
- // simplicity:
- baseLen = MAX_READ_SIZE;
- }
- }
- #endif // CHUNK_READ_SIZE_LIMIT
- if ( m_ulFileType == RIFF_FILE_MAGIC_NUMBER ||
- m_ulFileType == IFF_FILE_MAGIC_NUMBER )
- {
- // Make sure the chunk is aligned(2 bytes)
- uRem = (UINT16)((baseLen) % 2);
- //NOTE: if m_ulCurOffset is greater than 0x7FFFFFFF, GetLong
- // returns a negative number. Any negative number % 2 (at
- // least in Windows) returns 0 or -1, and ((UINT16)-1) == 0xFFFF
- // so uRem thus can be one of the following: {0, 1, 0xFFFF}.
- // The following if() conditional will, however, still work as
- // expected:
- if ( uRem != 0 )
- {
- m_ulFileSpecifiedReadSize = baseLen;
- resultOfRead = m_pFileObject->Read(baseLen+1);
- }
- else
- {
- m_ulFileSpecifiedReadSize = baseLen;
- resultOfRead = m_pFileObject->Read(baseLen);
- }
- }
- else
- {
- m_ulFileSpecifiedReadSize = baseLen;
- resultOfRead = m_pFileObject->Read(baseLen);
- }
- return resultOfRead;
- }
- case RS_ReadChunkBodyPending:
- #ifdef CHUNK_READ_SIZE_LIMIT
- if (m_pReassemblyBuffer)
- {
- BYTE* pAssemblyStart = m_pReassemblyBuffer->GetBuffer();
- HX_ASSERT(pAssemblyStart);
- HX_ASSERT(m_ulChunkSize - m_ulChunkBytesRead >= pBuffer->GetSize());
- UINT32 ulBytesToCopy = pBuffer->GetSize();
- if (pBuffer->GetSize() > m_ulChunkSize - m_ulChunkBytesRead)
- ulBytesToCopy = m_ulChunkSize - m_ulChunkBytesRead;
- memcpy(pAssemblyStart + m_ulChunkBytesRead, pBuffer->GetBuffer(), /* Flawfinder: ignore */
- ulBytesToCopy);
- m_ulChunkBytesRead += pBuffer->GetSize();
- if (m_ulChunkBytesRead == m_ulChunkSize || FAILED(status) ||
- pBuffer->GetSize() == 0)
- {
- m_state = RS_Ready;
- IHXBuffer* pOldBuffer = m_pReassemblyBuffer;
- m_pReassemblyBuffer = NULL;
- m_pResponse->RIFFGetChunkDone(status, m_ulGetChunkType, pOldBuffer);
- HX_RELEASE(pOldBuffer);
- return HXR_OK;
- }
- else
- {
- UINT32 baseLen = m_ulChunkSize - m_ulChunkBytesRead;
- if (baseLen > MAX_READ_SIZE)
- {
- baseLen = MAX_READ_SIZE;
- }
- HX_RESULT resultOfRead = HXR_OK;
- if ( m_ulFileType == RIFF_FILE_MAGIC_NUMBER ||
- m_ulFileType == IFF_FILE_MAGIC_NUMBER )
- {
- // Make sure the chunk is aligned(2 bytes)
- uRem = (UINT16)((baseLen) % 2);
- //NOTE: if m_ulCurOffset is greater than 0x7FFFFFFF, GetLong
- // returns a negative number. Any negative number % 2 (at
- // least in Windows) returns 0 or -1, and ((UINT16)-1) == 0xFFFF
- // so uRem thus can be one of the following: {0, 1, 0xFFFF}.
- // The following if() conditional will, however, still work as
- // expected:
- if ( uRem != 0 )
- {
- m_ulFileSpecifiedReadSize = baseLen;
- resultOfRead = m_pFileObject->Read(baseLen+1);
- }
- else
- {
- m_ulFileSpecifiedReadSize = baseLen;
- resultOfRead = m_pFileObject->Read(baseLen);
- }
- }
- else
- {
- m_ulFileSpecifiedReadSize = baseLen;
- resultOfRead = m_pFileObject->Read(baseLen);
- }
- return resultOfRead;
- }
- }
- #endif // CHUNK_READ_SIZE_LIMIT
- m_state = RS_Ready;
- m_pResponse->RIFFGetChunkDone(status, m_ulGetChunkType, pBuffer);
- return HXR_OK;
- case RS_DataReadPending:
- m_state = RS_Ready;
- return m_pResponse->RIFFReadDone(status, pBuffer);
- default:
- //m_state = RS_Ready;
- return HXR_UNEXPECTED;
- }
- return status;
- }
- STDMETHODIMP
- CRIFFReader::SeekDone(HX_RESULT status)
- {
- /* This may happen in HTTP streaming when the file system
- * is in still a seeking mode when the next seek is issued.
- * The file system will then call SeekDone with a status of
- * HXR_CANCELLED for the pending seek.
- */
- if ( status == HXR_CANCELLED )
- {
- return HXR_OK;
- }
- if ( status == HXR_OK )
- {
- m_ulCurOffset = m_ulSeekOffset;
- }
- HX_RESULT result = HXR_OK;
- switch ( m_state )
- {
- case RS_ChunkBodySeekPending:
- m_state = RS_ChunkHeaderReadPending;
- result = m_pFileObject->Read(sizeof(UINT32) + sizeof(UINT32));
- return(HXR_OK == status? result:status);
- case RS_FileStartSeekPending:
- m_state = RS_ChunkHeaderReadPending;
- result = m_pFileObject->Read(sizeof(UINT32) + sizeof(UINT32));
- return(HXR_OK == status? result:status);
- case RS_AscendSeekPending:
- m_state = RS_Ready;
- result = m_pResponse->RIFFAscendDone(status);
- return(HXR_OK == status? result:status);
- case RS_UserSeekPending:
- m_state = RS_Ready;
- result = m_pResponse->RIFFSeekDone(status);
- return(HXR_OK == status? result:status);
- default:
- return HXR_UNEXPECTED;
- }
- }
- HX_RESULT
- CRIFFReader::Seek(UINT32 offset, BOOL bRelative)
- {
- m_ulSeekOffset = bRelative ?
- m_ulCurOffset + offset :
- m_ulThisChunkOffset + offset;
- m_state = RS_UserSeekPending;
- return m_pFileObject->Seek(m_ulSeekOffset, FALSE);
- }
- UINT32
- CRIFFReader::IsThreadSafe()
- {
- return HX_THREADSAFE_METHOD_FSR_READDONE;
- }
- HX_RESULT
- CRIFFReader::FileSeek(UINT32 offset)
- {
- m_ulSeekOffset = offset;
- m_state = RS_UserSeekPending;
- return m_pFileObject->Seek(m_ulSeekOffset, FALSE);
- }
- HX_RESULT
- CRIFFReader::Descend()
- {
- if ( m_ulLevel > 0 && m_ulChunkType != LIST_CHUNK_ID )
- {
- m_pResponse->RIFFDescendDone(HXR_FAILED);
- return HXR_UNEXPECTED;
- }
- m_ulLevel++;
- m_levelInfo[m_ulLevel].m_startOffset = m_ulCurOffset;
- m_levelInfo[m_ulLevel].started = FALSE;
- return m_pResponse->RIFFDescendDone(HXR_OK);
- }
- HX_RESULT
- CRIFFReader::Ascend()
- {
- m_ulLevel--;
- m_state = RS_AscendSeekPending;
- if ( m_ulLevel == 0 )
- m_ulSeekOffset = 0;
- else
- {
- m_ulSeekOffset = m_levelInfo[m_ulLevel].m_nextChunkOffset;
- }
- m_pFileObject->Seek(m_ulSeekOffset, FALSE);
- return HXR_NOTIMPL;
- }
- STDMETHODIMP
- CRIFFReader::CloseDone(HX_RESULT status)
- {
- return HXR_OK;
- }
- STDMETHODIMP
- CRIFFReader::WriteDone(HX_RESULT status)
- {
- return HXR_NOTIMPL;
- }
- /************************************************************************
- * Method:
- * IHXFileResponse::FileObjectReady
- * Purpose:
- * Notification interface provided by users of the IHXFileObject
- * interface. This method is called by the IHXFileObject when the
- * requested FileObject is ready. It may return NULL with
- * HX_RESULT_FAIL if the requested filename did not exist in the
- * same pool.
- */
- STDMETHODIMP
- CRIFFReader::FileObjectReady
- (
- HX_RESULT status,
- IHXFileObject* pFileObject)
- {
- return HXR_OK;
- }
- HX_RESULT
- CRIFFReader::InternalClose()
- {
- return HXR_OK;
- }
- HX_RESULT
- CRIFFReader::Read(UINT32 len)
- {
- // Read from the file on our owner's behalf
- m_state = RS_DataReadPending;
- return m_pFileObject->Read(len);
- }
- UINT32
- CRIFFReader::GetListType()
- {
- return m_ulChunkSubType;
- }
- UINT32
- CRIFFReader::GetOffset()
- {
- return m_ulCurOffset;
- }
- UINT32
- CRIFFReader::FileType()
- {
- return m_ulFileType;
- }
- UINT32
- CRIFFReader::FileSubtype()
- {
- return m_ulSubFileType;
- }