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#include "bu/myriadstream.h"
#include "bu/mutexlocker.h"
Bu::MyriadStream::MyriadStream( Bu::Myriad &rMyriad,
Bu::Myriad::Stream *pStream, Bu::Myriad::Mode eMode ) :
rMyriad( rMyriad ),
pStream( pStream ),
eMode( eMode ),
iPos( 0 )
{
if( (eMode&Bu::Myriad::ReadWrite) == 0 )
{
throw Bu::MyriadException( Bu::MyriadException::invalidParameter,
"MyriadStream must be opened Read or Write or both.");
}
Bu::MutexLocker l( mAccess );
pStream->open();
if( (eMode&Bu::Myriad::Write) != 0 )
{
// Writing mode, what other options do we deal with?
if( (eMode&Bu::Myriad::Truncate) != 0 )
{
// Truncate, set size to zero before starting.
pStream->setSize( 0 );
}
else if( (eMode&Bu::Myriad::Append) != 0 )
{
iPos = pStream->getSize();
}
}
}
Bu::MyriadStream::~MyriadStream()
{
close();
}
void Bu::MyriadStream::close()
{
Bu::MutexLocker l( mAccess );
if( eMode )
{
pStream->close();
eMode = Bu::Myriad::None;
}
}
Bu::size Bu::MyriadStream::read( void *pBuf, size iBytes )
{
Bu::MutexLocker l( mAccess );
int32_t iRead = pStream->read( iPos, pBuf, iBytes );
iPos += iRead;
return iRead;
}
Bu::size Bu::MyriadStream::write( const void *pBuf, size iBytes )
{
Bu::MutexLocker l( mAccess );
int32_t iWrite = pStream->write( iPos, pBuf, iBytes );
iPos += iWrite;
return iWrite;
}
Bu::size Bu::MyriadStream::tell()
{
Bu::MutexLocker l( mAccess );
return iPos;
}
void Bu::MyriadStream::seek( size offset )
{
Bu::MutexLocker l( mAccess );
iPos += offset;
}
void Bu::MyriadStream::setPos( size pos )
{
Bu::MutexLocker l( mAccess );
iPos = pos;
}
void Bu::MyriadStream::setPosEnd( size pos )
{
Bu::MutexLocker l( mAccess );
iPos = pStream->getSize()-pos;
}
bool Bu::MyriadStream::isEos()
{
Bu::MutexLocker l( mAccess );
return iPos == pStream->getSize();
}
bool Bu::MyriadStream::isOpen()
{
return true;
}
void Bu::MyriadStream::flush()
{
// Does this make sense?
}
bool Bu::MyriadStream::canRead()
{
return true;
}
bool Bu::MyriadStream::canWrite()
{
return true;
}
bool Bu::MyriadStream::isReadable()
{
Bu::MutexLocker l( mAccess );
return (eMode&Bu::Myriad::Read) != 0;
}
bool Bu::MyriadStream::isWritable()
{
Bu::MutexLocker l( mAccess );
return (eMode&Bu::Myriad::Write) != 0;
}
bool Bu::MyriadStream::isSeekable()
{
return true;
}
bool Bu::MyriadStream::isBlocking()
{
return true;
}
void Bu::MyriadStream::setBlocking( bool /*bBlocking*/ )
{
// Dunno what this would even mean here.
}
void Bu::MyriadStream::setSize( size iSize )
{
Bu::MutexLocker l( mAccess );
pStream->setSize( iSize );
if( iPos > iSize )
iPos = iSize;
}
Bu::size Bu::MyriadStream::getSize() const
{
Bu::MutexLocker l( mAccess );
return pStream->getSize();
}
Bu::size Bu::MyriadStream::getBlockSize() const
{
Bu::MutexLocker l( mAccess );
return pStream->getBlockSize();
}
Bu::String Bu::MyriadStream::getLocation() const
{
Bu::MutexLocker l( mAccess );
return pStream->getLocation();
}
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