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/*
* libopenraw - ifdfilecontainer.cpp
*
* Copyright (C) 2006 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 <sys/types.h>
#include <cstdlib>
#include <cstdio>
#include <vector>
#include <iostream>
#include "debug.h"
#include "ifdfilecontainer.h"
#include "io/file.h"
using namespace Debug;
namespace OpenRaw {
namespace Internals {
IFDFileContainer::IFDFileContainer(IO::Stream *_file, off_t offset)
: RawContainer(_file, offset),
m_error(0),
m_exif_offset_correction(0),
m_current_dir(),
m_dirs()
{
}
IFDFileContainer::~IFDFileContainer()
{
m_dirs.clear();
}
IFDFileContainer::EndianType
IFDFileContainer::isMagicHeader(const char *p, int len)
{
if (len < 4){
// we need at least 4 bytes to check
return ENDIAN_NULL;
}
if ((p[0] == 0x49) && (p[1] == 0x49)
&& (p[2] == 0x2a) && (p[3] == 0x00)) {
return ENDIAN_LITTLE;
}
else if ((p[0] == 0x4d) && (p[1] == 0x4d)
&& (p[2] == 0x00) && (p[3] == 0x2a)) {
return ENDIAN_BIG;
}
return ENDIAN_NULL;
}
int IFDFileContainer::countDirectories(void)
{
if (m_dirs.size() == 0) {
// FIXME check result
bool ret = _locateDirs();
if (!ret) {
return -1;
}
}
return m_dirs.size();
}
std::vector<IFDDir::Ref> &
IFDFileContainer::directories()
{
if (m_dirs.size() == 0) {
countDirectories();
}
return m_dirs;
}
IFDDir::Ref
IFDFileContainer::setDirectory(int dir)
{
if (dir < 0) {
// FIXME set error
return IFDDir::Ref((IFDDir*)NULL);
}
// FIXME handle negative values
int n = countDirectories();
if (n <= 0) {
// FIXME set error
return IFDDir::Ref((IFDDir*)NULL);
}
// dir is signed here because we can pass negative
// value for specific Exif IFDs.
if (dir > (int)m_dirs.size()) {
// FIXME set error
return IFDDir::Ref((IFDDir*)NULL);
}
m_current_dir = m_dirs[dir];
m_current_dir->load();
return m_current_dir;
}
size_t
IFDFileContainer::getDirectoryDataSize()
{
// TODO move to IFDirectory
Trace(DEBUG1) << "getDirectoryDataSize()" << "\n";
off_t offset = m_current_dir->offset();
// FIXME check error
Trace(DEBUG1) << "offset = " << offset
<< " m_numTags = " << m_current_dir->numTags() << "\n";
off_t begin = offset + 2 + (m_current_dir->numTags()*12);
Trace(DEBUG1) << "begin = " << begin << "\n";
m_file->seek(begin, SEEK_SET);
begin += 2;
int32_t nextIFD;
readInt32(m_file, nextIFD);
Trace(DEBUG1) << "nextIFD = " << nextIFD << "\n";
if (nextIFD == 0) {
// FIXME not good
}
return nextIFD - begin;
}
bool IFDFileContainer::locateDirsPreHook()
{
return true;
}
bool
IFDFileContainer::_locateDirs(void)
{
if(!locateDirsPreHook()) {
return false;
}
Trace(DEBUG1) << "_locateDirs()\n";
if (m_endian == ENDIAN_NULL) {
char buf[4];
m_file->seek(m_offset, SEEK_SET);
m_file->read(buf, 4);
m_endian = isMagicHeader(buf, 4);
if (m_endian == ENDIAN_NULL) {
// FIXME set error code
return false;
}
}
m_file->seek(m_offset + 4, SEEK_SET);
int32_t offset = 0;
readInt32(m_file, offset);
m_dirs.clear();
do {
if (offset != 0) {
// std::cerr.setf(std::ios_base::hex, std::ios_base::basefield);
Trace(DEBUG1) << "push offset =0x" << offset << "\n";
// we assume the offset is relative to the begining of
// the IFD.
IFDDir::Ref dir(new IFDDir(m_offset + offset,*this));
m_dirs.push_back(dir);
// std::cerr.setf((std::ios_base::fmtflags)0, std::ios_base::basefield);
offset = dir->nextIFD();
}
} while(offset != 0);
Trace(DEBUG1) << "# dir found = " << m_dirs.size() << "\n";
return (m_dirs.size() != 0);
}
}
}
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