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/*
* libopenraw - ifddir.h
*
* Copyright (C) 2006-2007 Hubert Figuiere
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#ifndef _OPENRAW_INTERNALS_IFDDIR_H
#define _OPENRAW_INTERNALS_IFDDIR_H
#include <map>
#include <boost/config.hpp>
#include <boost/shared_ptr.hpp>
#include "ifdentry.h"
#include "debug.h"
namespace OpenRaw {
namespace Internals {
class IFDFileContainer;
class IFDDir
{
public:
typedef boost::shared_ptr<IFDDir> Ref;
typedef std::vector<Ref> RefVec;
struct isPrimary
{
bool operator()(const Ref &dir);
};
struct isThumbnail
{
bool operator()(const Ref &dir);
};
IFDDir(off_t _offset, IFDFileContainer & _container);
virtual ~IFDDir();
/** return the offset */
off_t offset() const
{
return m_offset;
}
/** load the directory to memory */
bool load();
/** return the number of entries*/
int numTags()
{
return m_entries.size();
}
IFDEntry::Ref getEntry(uint16_t id) const ;
/** Get a T value from an entry
* @param id the IFD field id
* @retval v the long value
* @return true if success
*/
template <typename T>
bool getValue(uint16_t id, T &v) const
{
bool success = false;
IFDEntry::Ref e = getEntry(id);
if (e != NULL) {
try {
v = IFDTypeTrait<T>::get(*e);
success = true;
}
catch(const std::exception & ex) {
Debug::Trace(ERROR) << "Exception raised " << ex.what()
<< " fetch value for " << id << "\n";
}
}
return success;
}
/** Get an loosely typed integer value from an entry.
* This method is preferred over getLongValue()
* or getShortValue() unless you really want the strong
* typing that IFD structure provide
* @param id the IFD field id
* @retval v the long value
* @return true if success
*/
bool getIntegerValue(uint16_t id, uint32_t &v);
/** get the offset of the next IFD
* in absolute
*/
off_t nextIFD();
/** get the SubIFD at index idx.
* @return Ref to the new IFDDir if found
*/
Ref getSubIFD(uint32_t idx = 0) const;
/** get all SubIFDs
* @retval ifds the list of IFDs Ref
* @return true if found / success
*/
bool getSubIFDs(std::vector<IFDDir::Ref> & ifds);
/** get the Exif IFD.
* @return Ref to the new IFDDir if found
*/
Ref getExifIFD();
private:
off_t m_offset;
IFDFileContainer & m_container;
std::map<uint16_t, IFDEntry::Ref> m_entries;
};
}
}
#endif
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