//-----------------------------------------------------------------------------
// Name: CWaveFile::Read()
// Desc: Reads section of data from a wave file into pBuffer and returns
// how much read in pdwSizeRead, reading not more than dwSizeToRead.
// This uses m_ck to determine where to start reading from. So
// subsequent calls will be continue where the last left off unless
// Reset() is called.
//-----------------------------------------------------------------------------
HRESULT CWaveFile::Read( BYTE* pBuffer, DWORD dwSizeToRead, DWORD* pdwSizeRead )
{
if( m_bIsReadingFromMemory )
{
if( m_pbDataCur == NULL )
return CO_E_NOTINITIALIZED;
if( pdwSizeRead != NULL )
*pdwSizeRead = 0;
if( ( BYTE* )( m_pbDataCur + dwSizeToRead ) >
( BYTE* )( m_pbData + m_ulDataSize ) )
{
dwSizeToRead = m_ulDataSize - ( DWORD )( m_pbDataCur - m_pbData );
}
#pragma warning( disable: 4616 ) // disable warning about warning number '22104' being out of range
#pragma warning( disable: 22104 ) // disable PREfast warning during static code analysis
CopyMemory( pBuffer, m_pbDataCur, dwSizeToRead );
#pragma warning( default: 22104 )
#pragma warning( default: 4616 )
if( pdwSizeRead != NULL )
*pdwSizeRead = dwSizeToRead;
return S_OK;
}
else
{
MMIOINFO mmioinfoIn; // current status of m_hmmio
if( m_hmmio == NULL )
return CO_E_NOTINITIALIZED;
if( pBuffer == NULL || pdwSizeRead == NULL )
return E_INVALIDARG;
*pdwSizeRead = 0;
if( 0 != mmioGetInfo( m_hmmio, &mmioinfoIn, 0 ) )
return DXTRACE_ERR( L"mmioGetInfo", E_FAIL );
UINT cbDataIn = dwSizeToRead;
if( cbDataIn > m_ck.cksize )
cbDataIn = m_ck.cksize;
m_ck.cksize -= cbDataIn;
for( DWORD cT = 0; cT < cbDataIn; cT++ )
{
// Copy the bytes from the io to the buffer.
if( mmioinfoIn.pchNext == mmioinfoIn.pchEndRead )
{
if( 0 != mmioAdvance( m_hmmio, &mmioinfoIn, MMIO_READ ) )
return DXTRACE_ERR( L"mmioAdvance", E_FAIL );
if( mmioinfoIn.pchNext == mmioinfoIn.pchEndRead )
return DXTRACE_ERR( L"mmioinfoIn.pchNext", E_FAIL );
}
// Actual copy.
*( ( BYTE* )pBuffer + cT ) = *( ( BYTE* )mmioinfoIn.pchNext );
mmioinfoIn.pchNext++;
}
if( 0 != mmioSetInfo( m_hmmio, &mmioinfoIn, 0 ) )
return DXTRACE_ERR( L"mmioSetInfo", E_FAIL );
*pdwSizeRead = cbDataIn;
return S_OK;
}
}
int WaveReadFile(
HMMIO hmmioIn, // IN
UINT cbRead, // IN
BYTE *pbDest, // IN
MMCKINFO *pckIn, // IN.
UINT *cbActualRead // OUT.
)
{
MMIOINFO mmioinfoIn; // current status of <hmmioIn>
int nError;
UINT cT, cbDataIn;
nError = 0;
if (nError = mmioGetInfo(hmmioIn, &mmioinfoIn, 0) != 0)
{
goto ERROR_CANNOT_READ;
}
cbDataIn = cbRead;
if (cbDataIn > pckIn->cksize)
cbDataIn = pckIn->cksize;
pckIn->cksize -= cbDataIn;
for (cT = 0; cT < cbDataIn; cT++)
{
/* Copy the bytes from the io to the buffer. */
if (mmioinfoIn.pchNext == mmioinfoIn.pchEndRead)
{
if ((nError = mmioAdvance(hmmioIn, &mmioinfoIn, MMIO_READ)) != 0)
{
goto ERROR_CANNOT_READ;
}
if (mmioinfoIn.pchNext == mmioinfoIn.pchEndRead)
{
nError = ER_CORRUPTWAVEFILE;
goto ERROR_CANNOT_READ;
}
}
// Actual copy.
// *((BYTE*)pbDest+cT) = *((BYTE*)mmioinfoIn.pchNext)++;
}
if ((nError = mmioSetInfo(hmmioIn, &mmioinfoIn, 0)) != 0)
{
goto ERROR_CANNOT_READ;
}
*cbActualRead = cbDataIn;
goto FINISHED_READING;
ERROR_CANNOT_READ:
*cbActualRead = 0;
FINISHED_READING:
return(nError);
}
