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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2011 SRI International
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#ifndef __cmtkFileConstHeader_h_included_
#define __cmtkFileConstHeader_h_included_
#include <cmtkconfig.h>
#include <System/cmtkMemory.h>
#include <string.h>
namespace
cmtk
{
/** \addtogroup IO */
//@{
/** Read-only access to fields in a binary file header.
*/
class FileConstHeader
{
public:
/// Constructor.
FileConstHeader( const void *const header, const bool isBigEndian = true )
{
this->m_ConstHeader = static_cast<const char*>( header );
this->m_IsBigEndian = isBigEndian;
}
/// Retrieve field of arbitrary type from header.
template<class T> T GetField( const size_t offset )
{
T result;
memcpy( &result, this->m_ConstHeader+offset, sizeof( T ) );
#ifdef WORDS_BIGENDIAN
if ( ! this->m_IsBigEndian ) result = Memory::ByteSwap( result );
#else
if ( this->m_IsBigEndian ) result = Memory::ByteSwap( result );
#endif
return result;
}
/// Get null-terminated string from header.
char* GetFieldString( const size_t offset, char* value, const size_t maxlen = 0 )
{
if ( maxlen )
strncpy( value, this->m_ConstHeader+offset, maxlen );
else
strcpy( value, this->m_ConstHeader+offset );
return value;
}
/** Compare n-character string.
*\return The comparison result code as returned by memcmp(), i.e., the result is 0 if the given string matches
* the respective portion of the header.
*/
bool CompareFieldStringN( const size_t offset, const char* value, const size_t len ) const
{
return !memcmp( this->m_ConstHeader+offset, value, len );
}
/// Retrieve array of arbitrary type from header.
template<class T> void GetArray
( T *const target, const size_t offset, const size_t length = 1 )
{
memcpy( target, this->m_ConstHeader+offset, length * sizeof( T ) );
#ifdef WORDS_BIGENDIAN
if ( ! this->m_IsBigEndian )
{
for ( size_t i = 0; i < length; ++i )
target[i] = Memory::ByteSwap( target[i] );
}
#else
if ( this->m_IsBigEndian )
{
for ( size_t i = 0; i < length; ++i )
target[i] = Memory::ByteSwap( target[i] );
}
#endif
}
private:
/// Pointer to the binary header.
const char *m_ConstHeader;
protected:
/// Flag for endianness.
bool m_IsBigEndian;
};
//@}
} // namespace cmtk
#endif // #ifndef __cmtkFileConstHeader_h_included_
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