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/*
------------------------------------------------------------------------------
MetaCam - Extract EXIF information from digital camera files, with
support for Vendor specific blocks.
Copyright (C) 2000 Daniel Stephens (daniel@cheeseplant.org)
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
------------------------------------------------------------------------------
*/
#include <iostream>
#include "datatiff.h"
static const char *rcsid __attribute__((unused))="$Id: dataifd.cc,v 1.2 2002/09/02 19:20:01 daniel Exp $";
_DataIFD::~_DataIFD()
{
if (entry_count) {
for (int i=0; i<entry_count; ++i) table[i]->delRef();
delete [] table;
}
table = 0;
}
_DataIFD::_DataIFD(const TIFFDataSource &src,
unsigned long o, unsigned long tagofs)
: _IFD(), source(src), ofs(o), table(0)
{
source.seek(ofs);
entry_count = source.getUShort();
table = new _DataIFDEntry *[entry_count];
int i;
unsigned long expofs = source.tell();
for (i=0; i<entry_count; ++i) {
unsigned short tag = source.getUShort() + tagofs;
unsigned short type = source.getUShort();
unsigned long values = source.getULong();
unsigned long offset = 0;
if ((values * _IFDEntry::typeLength(type)) <= 4) {
offset = source.tell();
} else {
offset = source.getULong();
}
table[i] = new _DataIFDEntry(source, offset, tag, type, values);
table[i]->addRef(); // Stop it from deleting itself later!
expofs += 12;
source.seek(expofs);
}
next_ifd_ofs = source.getULong();
}
unsigned short
_DataIFD::entries() const {
return entry_count;
}
IFD
_DataIFD::nextIFD() const
{
if (next_ifd_ofs == 0) return IFD();
return IFD(new _DataIFD(source, next_ifd_ofs, 0));
}
bool _DataIFD::isDynamic() const {
return false;
}
IFDEntry
_DataIFD::operator[](int n) const
{
if ((n<0) || (n>=entry_count)) {
cerr << "_DataIFD Array Bounds Violated" << endl;
exit(2);
}
return IFDEntry(table[n]);
}
IFDEntry
_DataIFD::findEntry(unsigned long tag, _IFDEntry *after) const
{
bool ready_to_return = (after == 0);
for (int i=0; i<entry_count; ++i) {
if (table[i]->getTag() != tag) continue;
if (ready_to_return) return IFDEntry(table[i]);
if (table[i] == after) ready_to_return = true;
}
return IFDEntry();
}
TIFFDataSource
_DataIFD::getSource() const
{
return source;
}
unsigned long
_DataIFD::getSourceOffset() const {
return ofs;
}
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