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/*
* Copyright (C) 2007-2023 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/buffer.h"
Bu::Buffer::Buffer( Bu::Stream &rNext, int iWhat, int iBufSize ) :
Bu::Filter( rNext ),
sSoFar( 0 ),
iBufSize( iBufSize ),
sReadBuf( NULL ),
sWriteBuf( NULL ),
iReadBufFill( 0 ),
iReadPos( 0 ),
iWriteBufFill( 0 ),
iWritePos( 0 ),
iWhat( iWhat )
{
sReadBuf = new char[iBufSize];
sWriteBuf = new char[iBufSize];
}
Bu::Buffer::~Buffer()
{
flush();
delete[] sReadBuf;
delete[] sWriteBuf;
}
void Bu::Buffer::start()
{
}
Bu::size Bu::Buffer::stop()
{
flush();
iReadBufFill = iReadPos = iWriteBufFill = iWritePos = 0;
return sSoFar;
}
void Bu::Buffer::fillReadBuf()
{
if( iReadBufFill+iReadPos < iBufSize )
{
iReadBufFill += rNext.read(
sReadBuf+iReadPos+iReadBufFill,
iBufSize-iReadBufFill-iReadPos
);
}
}
Bu::size Bu::Buffer::read( void *pBuf, Bu::size nBytes )
{
if( (iWhat&Read) == 0 )
return rNext.read( pBuf, nBytes );
if( nBytes <= 0 )
{
fillReadBuf();
return 0;
}
Bu::size nTotRead = 0;
// fillReadBuf();
do
{
int iAmnt = nBytes-nTotRead;
if( iAmnt > iReadBufFill )
{
iAmnt = iReadBufFill;
}
if( iAmnt > 0 )
{
memcpy( ((char *)pBuf)+nTotRead, sReadBuf+iReadPos, iAmnt );
iReadPos += iAmnt;
nTotRead += iAmnt;
iReadBufFill -= iAmnt;
}
if( iReadBufFill == 0 )
{
iReadPos = 0;
fillReadBuf();
}
}
while( nTotRead < nBytes && iReadBufFill > 0 );
//printf("Buffer: %db returned, %db remain in buffer.\n", nTotRead, iReadBufFill );
return nTotRead;
}
Bu::size Bu::Buffer::write( const void *pBuf, Bu::size nBytes )
{
if( (iWhat&Write) == 0 )
return rNext.write( pBuf, nBytes );
Bu::size nTotWrote = 0;
do
{
int iAmnt = nBytes-nTotWrote;
if( iAmnt > iBufSize-iWritePos-iWriteBufFill )
{
iAmnt = iBufSize-iWritePos-iWriteBufFill;
}
if( iAmnt > 0 )
{
memcpy(
sWriteBuf+iWritePos+iWriteBufFill,
((char *)pBuf)+nTotWrote,
iAmnt
);
nTotWrote += iAmnt;
iWriteBufFill += iAmnt;
//printf("Buffer: Moved %db to write buffer, %db filled now.\n",
//iAmnt, iWriteBufFill );
}
while( iWritePos+iWriteBufFill == iBufSize )
{
//printf("iWritePos = %d\n", iWritePos );
int iWr = rNext.write( sWriteBuf+iWritePos, iWriteBufFill );
//printf("Buffer: Wrote %db from buffer to stream, %db filled now.\n", iWr, iWriteBufFill-iWr );
if( iWr == 0 )
{
return nTotWrote;
}
else if( iWr == iWriteBufFill )
{
iWritePos = iWriteBufFill = 0;
}
else
{
iWritePos += iWr;
iWriteBufFill -= iWr;
}
}
}
while( nTotWrote < nBytes && iWriteBufFill < iBufSize+iWritePos );
return nTotWrote;
}
void Bu::Buffer::flush()
{
if( (iWhat&Write) == 0 )
return rNext.flush();
if( iWriteBufFill > 0 )
{
//printf("Buffer: Flushing remaining data, %db.\n", iWriteBufFill );
int iWr = 0;
do
{
iWr = rNext.write( sWriteBuf+iWritePos, iWriteBufFill );
//printf("Buffer: %db written to stream.\n", iWr );
iWritePos += iWr;
iWriteBufFill -= iWr;
} while( iWriteBufFill > 0 && iWr > 0 );
}
}
bool Bu::Buffer::isEos()
{
return (iReadPos >= (iReadBufFill-1)) && (rNext.isEos());
}
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