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/*
* Copyright (C) 2007-2008 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/nidsstream.h"
#include <string.h>
Bu::NidsStream::NidsStream( Nids &rNids, uint32_t uStream ) :
rNids( rNids ),
uStream( uStream ),
pCurBlock( NULL ),
uCurBlock( uStream ),
uSize( 0 ),
uBlockSize( rNids.iBlockSize-sizeof(Nids::Block) ),
uPos( 0 )
{
//printf("NidsStream::allocated\n");
pCurBlock = rNids.newBlock();
rNids.getBlock( uStream, pCurBlock );
uSize = pCurBlock->uBytesUsed;
}
/*
Bu::NidsStream::NidsStream( const Bu::NidsStream &rSrc ) :
Stream( rSrc ),
rNids( rSrc.rNids ),
uStream( rSrc.uStream ),
pCurBlock( NULL ),
uCurBlock( uStream ),
uSize( 0 ),
uBlockSize( rSrc.uBlockSize ),
iUsable( uBlockSize-sizeof(Nids::Block) ),
uPos( 0 )
{
printf("NidsStream::copied\n");
pCurBlock = rNids.newBlock();
rNids.getBlock( uStream, pCurBlock );
}*/
Bu::NidsStream::~NidsStream()
{
//printf("Destroying stream?\n");
rNids.updateStreamSize( uStream, uSize );
rNids.deleteBlock( pCurBlock );
}
void Bu::NidsStream::close()
{
}
size_t Bu::NidsStream::read( void *pBuf, size_t nBytes )
{
if( nBytes == 0 )
return 0;
if( nBytes + uPos > uSize )
nBytes = uSize - uPos;
if( (uPos%uBlockSize)+nBytes < uBlockSize )
{
size_t iRead = nBytes;
if( iRead > pCurBlock->uBytesUsed-(uPos%uBlockSize) )
iRead = pCurBlock->uBytesUsed-(uPos%uBlockSize);
memcpy( pBuf, pCurBlock->pData+(uPos%uBlockSize), iRead );
//printf("read buffill: %ub, %u-%u/%u -> %d-%d/%d (a:%u)",
// iRead, uPos, uPos+iRead-1, uSize, 0, iRead-1, nBytes, uCurBlock );
uPos += iRead;
//printf(" -- %u\n", uPos%uBlockSize );
//printf("ra: block %u = %ub:%u (%ub total)\n",
// uCurBlock, uPos, nBytes, uSize );
// This can't happen, if we're right on a boundery, it goes to the
// other case
//if( uPos%uBlockSize == 0 )
// uCurBlock = rNids.getNextBlock( uCurBlock, pCurBlock, false );
return iRead;
}
else
{
size_t nTotal = 0;
for(;;)
{
uint32_t iRead = nBytes;
if( iRead > uBlockSize-(uPos%uBlockSize) )
iRead = uBlockSize-(uPos%uBlockSize);
if( iRead > pCurBlock->uBytesUsed-(uPos%uBlockSize) )
iRead = pCurBlock->uBytesUsed-(uPos%uBlockSize);
memcpy( ((char *)pBuf)+nTotal,
pCurBlock->pData+(uPos%uBlockSize), iRead );
//printf(" read buffill: %ub, %u-%u/%u -> %d-%d/%d (b:%u)\n",
// iRead, uPos, uPos+iRead-1, uSize,
// nTotal, nTotal+nBytes-1, nBytes, uCurBlock );
uPos += iRead;
nBytes -= iRead;
nTotal += iRead;
//printf("rb: block %u = %ub:%u (%ub total)\n",
// uCurBlock, uPos, iRead, uSize );
if( uPos%uBlockSize == 0 )
uCurBlock = rNids.getNextBlock( uCurBlock, pCurBlock, false );
if( nBytes == 0 || uPos >= uSize )
return nTotal;
}
}
return 0;
}
size_t Bu::NidsStream::write( const void *pBuf, size_t nBytes )
{
if( nBytes == 0 )
return 0;
/* if( pCurBlock->uBytesUsed >= uBlockSize )
{
// We're at the end of our current block, allocate another before we do
// anything.
uCurBlock = rNids.getNextBlock( uCurBlock, pCurBlock );
} */
if( (uPos%uBlockSize)+nBytes < uBlockSize )
{
//printf("wa: %u:%u:%u:%u -> ", uPos, uPos%uBlockSize, uSize, pCurBlock->uBytesUsed );
memcpy( pCurBlock->pData+(uPos%uBlockSize), pBuf, nBytes );
//printf("write buffill: %ub, %u-%u/%u -> %d-%d/%d (a:%u:%u)\n",
// nBytes, 0, nBytes-1, nBytes,
// uPos, uPos+nBytes-1, uSize, uCurBlock,
// pCurBlock->uBytesUsed );
if( (uPos%uBlockSize)+nBytes > pCurBlock->uBytesUsed )
pCurBlock->uBytesUsed = (uPos%uBlockSize)+nBytes;
rNids.setBlock( uCurBlock, pCurBlock );
uPos += nBytes;
if( uPos > uSize )
uSize = uPos;
//printf("block %u = %ub (%ub total) %d:%u\n",
// uCurBlock, pCurBlock->uBytesUsed, uSize, nBytes, uPos );
return nBytes;
}
else
{
size_t nTotal = 0;
for(;;)
{
uint32_t uNow = uBlockSize-(uPos%uBlockSize);
//printf("uNow: %u (%u-(%u%%%u)) %d req\n", uNow, uBlockSize, uPos, uBlockSize, nBytes );
if( nBytes < uNow )
uNow = nBytes;
memcpy( pCurBlock->pData+(uPos%uBlockSize),
&((char *)pBuf)[nTotal], uNow );
//printf("write buffill: %ub, %u-%u/%u -> %d-%d/%d (b:%u:%u)\n",
// uNow, nTotal, nTotal+uNow-1, nBytes,
// uPos, uPos+uNow-1, uSize, uCurBlock, pCurBlock->uBytesUsed );
if( (uPos%uBlockSize)+uNow > pCurBlock->uBytesUsed )
pCurBlock->uBytesUsed = (uPos%uBlockSize)+uNow;
rNids.setBlock( uCurBlock, pCurBlock );
uPos += uNow;
if( uPos > uSize )
uSize = uPos;
nTotal += uNow;
nBytes -= uNow;
//printf("wb: block %u = %ub (%ub total)\n",
// uCurBlock, pCurBlock->uBytesUsed, uSize );
//if( pCurBlock->uBytesUsed == uBlockSize )
if( uPos%uBlockSize == 0 )
uCurBlock = rNids.getNextBlock( uCurBlock, pCurBlock );
if( nBytes == 0 )
return nTotal;
}
}
}
long Bu::NidsStream::tell()
{
return uPos;
}
void Bu::NidsStream::seek( long offset )
{
uPos += offset;
}
void Bu::NidsStream::setPos( long pos )
{
uPos = pos;
}
void Bu::NidsStream::setPosEnd( long pos )
{
uPos = uSize-pos-1;
}
bool Bu::NidsStream::isEos()
{
return true;
}
bool Bu::NidsStream::isOpen()
{
return true;
}
void Bu::NidsStream::flush()
{
}
bool Bu::NidsStream::canRead()
{
return true;
}
bool Bu::NidsStream::canWrite()
{
return true;
}
bool Bu::NidsStream::isReadable()
{
return true;
}
bool Bu::NidsStream::isWritable()
{
return true;
}
bool Bu::NidsStream::isSeekable()
{
return true;
}
bool Bu::NidsStream::isBlocking()
{
return true;
}
void Bu::NidsStream::setBlocking( bool /*bBlocking*/ )
{
}
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