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/*
* libopenraw - ifddir.cpp
*
* 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/>.
*/
#include <libopenraw/types.h>
#include "debug.h"
#include "exception.h"
#include "ifd.h"
#include "io/stream.h"
#include "ifdfilecontainer.h"
#include "ifddir.h"
using namespace Debug;
namespace OpenRaw {
namespace Internals {
bool IFDDir::isPrimary::operator()(const Ref &dir)
{
uint32_t subtype = 1;
return dir->getValue(IFD::EXIF_TAG_NEW_SUBFILE_TYPE, subtype)
&& (subtype == 0);
}
bool IFDDir::isThumbnail::operator()(const Ref &dir)
{
uint32_t subtype = 0;
return dir->getValue(IFD::EXIF_TAG_NEW_SUBFILE_TYPE, subtype)
&& (subtype == 1);
}
IFDDir::IFDDir(off_t _offset, IFDFileContainer & _container)
: m_offset(_offset), m_container(_container),
m_entries()
{
}
IFDDir::~IFDDir()
{
}
bool IFDDir::load()
{
Trace(DEBUG1) << "IFDDir::load() m_offset =" << m_offset << "\n";
int16_t numEntries = 0;
IO::Stream *file = m_container.file();
m_entries.clear();
file->seek(m_offset, SEEK_SET);
m_container.readInt16(file, numEntries);
for(int16_t i = 0; i < numEntries; i++) {
uint16_t id;
int16_t type;
int32_t count;
uint32_t data;
m_container.readUInt16(file, id);
m_container.readInt16(file, type);
m_container.readInt32(file, count);
file->read(&data, 4);
IFDEntry::Ref entry(new IFDEntry(id, type,
count, data, m_container));
m_entries[id] = entry;
}
return true;
}
IFDEntry::Ref IFDDir::getEntry(uint16_t id) const
{
std::map<uint16_t, IFDEntry::Ref>::const_iterator iter;
iter = m_entries.find(id);
if (iter != m_entries.end()) {
return iter->second;
}
return IFDEntry::Ref((IFDEntry*)NULL);
}
bool IFDDir::getIntegerValue(uint16_t id, uint32_t &v)
{
bool success = false;
IFDEntry::Ref e = getEntry(id);
if (e != NULL) {
try {
switch(e->type())
{
case IFD::EXIF_FORMAT_LONG:
v = IFDTypeTrait<uint32_t>::get(*e);
success = true;
break;
case IFD::EXIF_FORMAT_SHORT:
v = IFDTypeTrait<uint16_t>::get(*e);
success = true;
break;
default:
break;
}
}
catch(const std::exception & ex) {
Trace(ERROR) << "Exception raised " << ex.what()
<< " fetch integer value for " << id << "\n";
}
}
return success;
}
off_t IFDDir::nextIFD()
{
int16_t numEntries;
IO::Stream *file = m_container.file();
if(m_entries.size() == 0) {
file->seek(m_offset, SEEK_SET);
m_container.readInt16(file, numEntries);
Trace(DEBUG1) << "numEntries =" << numEntries
<< " shifting " << (numEntries * 12) + 2
<< "bytes\n";
}
else {
numEntries = m_entries.size();
}
file->seek(m_offset + (numEntries * 12) + 2, SEEK_SET);
int32_t next;
m_container.readInt32(file, next);
return next;
}
/** The SubIFD is locate at offset found in the field
* EXIF_TAG_SUB_IFDS
*/
IFDDir::Ref IFDDir::getSubIFD(uint32_t idx) const
{
std::vector<uint32_t> offsets;
IFDEntry::Ref e = getEntry(IFD::EXIF_TAG_SUB_IFDS);
if (e != NULL) {
try {
e->getArray(offsets);
if (idx >= offsets.size()) {
Ref ref(new IFDDir(offsets[idx], m_container));
ref->load();
return ref;
}
}
catch(const std::exception &ex) {
Trace(ERROR) << "Exception " << ex.what() << "\n";
}
}
return Ref(static_cast<IFDDir*>(NULL));
}
bool IFDDir::getSubIFDs(std::vector<IFDDir::Ref> & ifds)
{
bool success = false;
std::vector<uint32_t> offsets;
IFDEntry::Ref e = getEntry(IFD::EXIF_TAG_SUB_IFDS);
if (e != NULL) {
try {
e->getArray(offsets);
for (std::vector<uint32_t>::const_iterator iter = offsets.begin();
iter != offsets.end(); iter++) {
Ref ifd(new IFDDir(*iter, m_container));
ifd->load();
ifds.push_back(ifd);
}
success = true;
}
catch(const std::exception &ex) {
Trace(ERROR) << "Exception " << ex.what() << "\n";
}
}
return success;
}
/** The SubIFD is locate at offset found in the field
* EXIF_TAG_SUB_IFDS
*/
IFDDir::Ref IFDDir::getExifIFD()
{
bool success = false;
uint32_t val_offset = 0;
success = getValue(IFD::EXIF_TAG_EXIF_IFD_POINTER, val_offset);
if (success) {
Trace(DEBUG1) << "Exif IFD offset (uncorrected) = " << val_offset
<< "\n";
val_offset += m_container.exifOffsetCorrection();
Trace(DEBUG1) << "Exif IFD offset = " << val_offset << "\n";
Ref ref(new IFDDir(val_offset, m_container));
ref->load();
return ref;
}
else {
Trace(DEBUG1) << "Exif IFD offset not found.\n";
}
return Ref(static_cast<IFDDir*>(NULL));
}
}
}
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