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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include "bu/myriadstream.h"
#include "bu/sio.h"
using Bu::sio;
using Bu::Fmt;
#include <string.h>
// #define MYRIAD_STREAM_DEBUG 1
Bu::MyriadStream::MyriadStream( Bu::Myriad &rMyriad,
Bu::Myriad::Stream *pStream ) :
rMyriad( rMyriad ),
pStream( pStream ),
pCurBlock( NULL ),
iPos( 0 )
{
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: " << __LINE__ << ": Created, iId=" << pStream->iId << ", iSize="
<< pStream->iSize << sio.nl;
#endif
//pCurBlock = rMyriad.newBlock();
//rMyriad.getBlock( uStream, pCurBlock );
//uSize = pCurBlock->uBytesUsed;
}
Bu::MyriadStream::~MyriadStream()
{
if( pCurBlock )
rMyriad.releaseBlock( pCurBlock );
//rMyriad.updateStreamSize( uStream, uSize );
//rMyriad.deleteBlock( pCurBlock );
}
void Bu::MyriadStream::close()
{
}
size_t Bu::MyriadStream::read( void *pBuf, size_t nBytes )
{
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: read: " << __LINE__ << ": Started, asked to read " << nBytes << "b."
<< sio.nl;
#endif
if( nBytes > pStream->iSize-iPos )
nBytes = pStream->iSize-iPos;
if( nBytes <= 0 )
return 0;
int iLeft = nBytes;
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: read: " << __LINE__ << ": Started, going to read " << nBytes << "b."
<< sio.nl;
#endif
if( pCurBlock == NULL )
{
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: read: " << __LINE__ << ": No block loaded, loading initial block."
<< sio.nl;
#endif
pCurBlock = rMyriad.getBlock(
pStream->aBlocks[iPos/rMyriad.iBlockSize]
);
}
while( iLeft > 0 )
{
int iCurBlock = pStream->aBlocks[iPos/rMyriad.iBlockSize];
if( pCurBlock->iBlockIndex != iCurBlock )
{
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: read: " << __LINE__ << ": Loading new block " << iCurBlock << "."
<< sio.nl;
#endif
rMyriad.releaseBlock( pCurBlock );
pCurBlock = rMyriad.getBlock( iCurBlock );
}
int iAmnt = Bu::min(
Bu::min(
rMyriad.iBlockSize - iPos%rMyriad.iBlockSize,
iLeft
),
pStream->iSize-iPos
);
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: read: " << __LINE__ << ": Copying out bytes: "
<< iPos << "(" << (iPos%rMyriad.iBlockSize) << ")+"
<< iAmnt
<< ", " << iLeft << "b left." << sio.nl;
#endif
memcpy(
pBuf,
pCurBlock->pData+(iPos%rMyriad.iBlockSize),
iAmnt
);
iPos += iAmnt;
pBuf = &((char *)pBuf)[iAmnt];
iLeft -= iAmnt;
}
return nBytes;
}
size_t Bu::MyriadStream::write( const void *pBuf, size_t nBytes )
{
if( nBytes <= 0 )
return 0;
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: write: " << __LINE__ << ": Started, asked to write " << nBytes << "b."
<< sio.nl;
#endif
if( nBytes <= 0 )
return 0;
int iLeft = nBytes;
/*
if( pCurBlock == NULL )
{
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: write: No block loaded, loading initial block."
<< sio.nl;
#endif
pCurBlock = rMyriad.getBlock(
pStream->aBlocks[iPos/rMyriad.iBlockSize]
);
}*/
while( iLeft > 0 )
{
int iCurBlock;
if( iPos/rMyriad.iBlockSize < pStream->aBlocks.getSize() )
{
iCurBlock = pStream->aBlocks[iPos/rMyriad.iBlockSize];
}
else
{
iCurBlock = rMyriad.streamAddBlock( pStream );
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: write: " << __LINE__ << ": New block allocated and appended: "
<< iCurBlock << "." << sio.nl;
#endif
}
if( !pCurBlock || pCurBlock->iBlockIndex != iCurBlock )
{
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: write: " << __LINE__ << ": Loading new block " << iCurBlock << "."
<< sio.nl;
#endif
rMyriad.releaseBlock( pCurBlock );
pCurBlock = rMyriad.getBlock( iCurBlock );
}
pCurBlock->bChanged = true;
// There are two main writing modes when it comes down to it.
// Overwrite mode and append mode. Append is what pretty much always
// happens when creating a new stream.
if( iPos < pStream->iSize )
{
int iAmnt = Bu::min(
Bu::min(
rMyriad.iBlockSize - iPos%rMyriad.iBlockSize,
iLeft
),
pStream->iSize-iPos
);
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: write (ovr): " << __LINE__ << ": Copying in bytes: "
<< (iPos%rMyriad.iBlockSize) << "+"
<< iAmnt
<< ", " << iLeft << "b left." << sio.nl;
#endif
memcpy(
pCurBlock->pData+(iPos%rMyriad.iBlockSize),
pBuf,
iAmnt
);
iPos += iAmnt;
pBuf = &((char *)pBuf)[iAmnt];
iLeft -= iAmnt;
}
else
{
int iAmnt = Bu::min(
rMyriad.iBlockSize - iPos%rMyriad.iBlockSize,
iLeft
);
#ifdef MYRIAD_STREAM_DEBUG
sio << "MyriadStream: write (app): " << __LINE__ << ": Copying in bytes: "
<< (iPos%rMyriad.iBlockSize) << "+"
<< iAmnt
<< ", " << iLeft << "b left." << sio.nl;
#endif
memcpy(
pCurBlock->pData+(iPos%rMyriad.iBlockSize),
pBuf,
iAmnt
);
iPos += iAmnt;
pStream->iSize += iAmnt;
pBuf = &((char *)pBuf)[iAmnt];
iLeft -= iAmnt;
}
}
return nBytes;
}
long Bu::MyriadStream::tell()
{
return iPos;
}
void Bu::MyriadStream::seek( long offset )
{
iPos += offset;
}
void Bu::MyriadStream::setPos( long pos )
{
iPos = pos;
}
void Bu::MyriadStream::setPosEnd( long pos )
{
iPos = pStream->iSize-pos;
}
bool Bu::MyriadStream::isEos()
{
return iPos >= pStream->iSize;
}
bool Bu::MyriadStream::isOpen()
{
return true;
}
void Bu::MyriadStream::flush()
{
}
bool Bu::MyriadStream::canRead()
{
return true;
}
bool Bu::MyriadStream::canWrite()
{
return true;
}
bool Bu::MyriadStream::isReadable()
{
return true;
}
bool Bu::MyriadStream::isWritable()
{
return true;
}
bool Bu::MyriadStream::isSeekable()
{
return true;
}
bool Bu::MyriadStream::isBlocking()
{
return true;
}
void Bu::MyriadStream::setBlocking( bool /*bBlocking*/ )
{
}
void Bu::MyriadStream::setSize( long iSize )
{
if( iSize < 0 )
iSize = 0;
rMyriad.setStreamSize( pStream, iSize );
if( iPos > iSize )
iPos = iSize;
}
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