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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 <errno.h>
#include <string.h>
#include <netinet/in.h>
#include "filetiff.h"
static const char *rcsid __attribute__((unused))="$Id: filetiff.cc,v 1.3 2004/08/21 17:40:29 daniel Exp $";
_FileTIFF::_FileTIFF(istream &i, unsigned long ofs)
: is(i), global_offset(ofs), good(true)
{
seek(0);
unsigned char header[2];
getData(header,2);
if ((header[0] == 'I') && (header[1] == 'I')) {
bigendian = false;
} else if ((header[0] == 'M') && (header[1] == 'M')) {
bigendian = true;
} else {
good = false;
// cerr << "Unknown byte ordering - aborting" << endl;
// exit(2);
return;
}
unsigned short checknum = getUShort();
if (checknum != 42) {
good = false;
// cerr << "Bad checknum: " << checknum << endl;
// exit(2);
return;
}
}
_FileTIFF::~_FileTIFF()
{
// Nothing
}
void
_FileTIFF::seek(unsigned long ofs)
{
is.seekg(ofs+global_offset, ios::beg);
}
size_t
_FileTIFF::getData(unsigned char *buf, size_t bytes)
{
is.read((char*)buf, bytes);
if ((unsigned)is.gcount() != bytes) {
// int err = errno;
// cerr << "Read failed: " << strerror(err) << endl;
// exit(2);
return is.gcount();
}
return bytes;
}
unsigned char
_FileTIFF::getUByte()
{
unsigned char b = 0;
getData((unsigned char *)&b, 1);
return b;
}
unsigned short
_FileTIFF::getUShort()
{
unsigned short s = 0;
getData((unsigned char *)&s, 2);
if (bigendian) {return ntohs(s);}
return s;
}
unsigned long
_FileTIFF::getULong()
{
unsigned long l = 0;
getData((unsigned char *)&l, 4);
if (bigendian) {return ntohl(l);}
return l;
}
signed char
_FileTIFF::getSByte()
{
signed char b = 0;
getData((unsigned char *)&b, 1);
return b;
}
signed short
_FileTIFF::getSShort()
{
signed short s = 0;
getData((unsigned char *)&s, 2);
if (bigendian) {return ntohs(s);}
return s;
}
signed long
_FileTIFF::getSLong()
{
signed long l = 0;
getData((unsigned char *)&l, 4);
if (bigendian) {return ntohl(l);}
return l;
}
IFD
_FileTIFF::getIFD()
{
return _TIFFDataSource::getIFD(firstIFDOffset());
}
IFD
_FileTIFF::getIFD(unsigned long ofs)
{
return _TIFFDataSource::getIFD(ofs);
}
bool
_FileTIFF::bigEndian() const
{
return bigendian;
}
bool
_FileTIFF::isGood() const
{
return good;
}
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