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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/membuf.h"
using namespace Bu;
Bu::MemBuf::MemBuf() :
nPos( 0 )
{
}
Bu::MemBuf::MemBuf( const Bu::FString &str ) :
sBuf( str ),
nPos( 0 )
{
}
Bu::MemBuf::~MemBuf()
{
}
void Bu::MemBuf::close()
{
}
size_t Bu::MemBuf::read( void *pBuf, size_t nBytes )
{
if( (size_t)sBuf.getSize()-(size_t)nPos < nBytes )
nBytes = sBuf.getSize()-nPos;
memcpy( pBuf, sBuf.getStr()+nPos, nBytes );
nPos += nBytes;
return nBytes;
}
size_t Bu::MemBuf::write( const void *pBuf, size_t nBytes )
{
if( nPos == sBuf.getSize() )
{
// Easiest, just append the data.
sBuf.append( (const char *)pBuf, nBytes );
nPos += nBytes;
return nBytes;
}
else
{
// Trickier, we must do this in two parts, overwrite, then append
// Frist, overwrite.
size_t iOver = sBuf.getSize() - nPos;
if( iOver > nBytes )
iOver = nBytes;
memcpy( sBuf.getStr()+nPos, pBuf, iOver );
// Then append
if( iOver < nBytes )
{
sBuf.append( ((const char *)pBuf)+iOver, nBytes-iOver );
}
nPos += nBytes;
return nBytes;
}
}
long Bu::MemBuf::tell()
{
return nPos;
}
void Bu::MemBuf::seek( long offset )
{
nPos += offset;
if( nPos < 0 ) nPos = 0;
else if( nPos > sBuf.getSize() ) nPos = sBuf.getSize();
}
void Bu::MemBuf::setPos( long pos )
{
nPos = pos;
if( nPos < 0 ) nPos = 0;
else if( nPos > sBuf.getSize() ) nPos = sBuf.getSize();
}
void Bu::MemBuf::setPosEnd( long pos )
{
nPos = sBuf.getSize()-pos;
if( nPos < 0 ) nPos = 0;
else if( nPos > sBuf.getSize() ) nPos = sBuf.getSize();
}
bool Bu::MemBuf::isEOS()
{
return (nPos == sBuf.getSize());
}
bool Bu::MemBuf::isOpen()
{
return true;
}
void Bu::MemBuf::flush()
{
}
bool Bu::MemBuf::canRead()
{
return !isEOS();
}
bool Bu::MemBuf::canWrite()
{
return isEOS();
}
bool Bu::MemBuf::isReadable()
{
return true;
}
bool Bu::MemBuf::isWritable()
{
return true;
}
bool Bu::MemBuf::isSeekable()
{
return true;
}
bool Bu::MemBuf::isBlocking()
{
return true;
}
void Bu::MemBuf::setBlocking( bool )
{
}
Bu::FString &Bu::MemBuf::getString()
{
return sBuf;
}
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