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#include "bu/myriadfs.h"
#include "bu/myriadstream.h"
#include <string.h>
#include <unistd.h>
namespace Bu { subExceptionDef( MyriadFsException ) }
#define Myriad_Fs_MAGIC_CODE ((char *)"\xa7\x18\x8b\x39")
Bu::MyriadFs::MyriadFs( Bu::Stream &rStore, int iBlockSize ) :
rStore( rStore ),
mStore( rStore, iBlockSize )
{
if( mStore.hasStream( 1 ) )
{
// Check to see if this is a MyriadFs stream.
Bu::MyriadStream ms = mStore.openStream( 1 );
char sMagic[4];
if( ms.read( sMagic, 4 ) < 4 )
throw MyriadFsException("The provided stream does not appear to be "
"a MyriadFs stream.");
if( ::strncmp( sMagic, Myriad_Fs_MAGIC_CODE, 4 ) )
throw MyriadFsException("The provided stream does not appear to be "
"a MyriadFs stream.");
int8_t iVer;
}
else
{
// Create initial header stream
{
mStore.createStream( 1 );
Bu::MyriadStream ms = mStore.openStream( 1 );
ms.write( Myriad_Fs_MAGIC_CODE, 4 );
int8_t iVer = 1;
int32_t iTmp = 1;
ms.write( &iVer, 1 );
ms.write( &iBlockSize, 4 );
ms.write( &iTmp, 4 ); // iNumNodes
iTmp = 0;
ms.write( &iTmp, 4 ); // iInode
ms.write( &iTmp, 0 ); // iPosition
}
// Create initial inode stream, with one root node.
{
mStore.createStream( 2 );
Bu::MyriadStream ms = mStore.openStream( 2 );
int32_t iUser = 0, iGroup = 0;
#ifndef WIN32
iUser = getuid();
iGroup = getgid();
#endif
int32_t iTmp32 = 0;
int16_t iTmp16 = 0;
ms.write( &iUser, 4 );
ms.write( &iGroup, 4 );
ms.write( &iTmp16, 2 );
ms.write( &iTmp16, 2 );
iTmp32 = 3;
ms.write( &iTmp32, 4 );
iTmp32 = 0;
ms.write( &iTmp32, 4 );
ms.write( &iTmp16, 2 );
}
// Create inode 0's storage stream.
{
mStore.createStream( 3 );
}
}
}
Bu::MyriadFs::~MyriadFs()
{
}
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