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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.h>
#include <errno.h>
#include <string.h>
#include <netinet/in.h>
#include "metacam.h"
static const char *rcsid="$Id: tifffile.cc,v 1.2 2000/05/29 22:11:28 daniel Exp $";
tiffFile::tiffFile(istream &i, unsigned long ofs)
: is(i), global_offset(ofs)
{
Seek(0);
unsigned char header[2];
Get_Data(header,2);
if ((header[0] == 'I') && (header[1] == 'I')) {
bigendian = false;
} else if ((header[0] == 'M') && (header[1] == 'M')) {
bigendian = true;
} else {
cerr << "Unknown byte ordering - aborting" << endl;
exit(2);
}
unsigned short checknum = Get_UShort();
if (checknum != 42) {
cerr << "Bad checknum: " << checknum << endl;
exit(2);
}
}
void
tiffFile::Seek(unsigned long ofs)
{
is.seekg(ofs+global_offset, ios::beg);
}
void
tiffFile::Get_Data(unsigned char *buf, size_t bytes)
{
is.read(buf, bytes);
if (is.gcount() != bytes) {
int err = errno;
cerr << "Read failed: " << strerror(err) << endl;
exit(2);
}
}
unsigned char
tiffFile::Get_UByte()
{
unsigned char b;
Get_Data((unsigned char *)&b, 1);
return b;
}
unsigned short
tiffFile::Get_UShort()
{
unsigned short s;
Get_Data((unsigned char *)&s, 2);
if (bigendian) {return ntohs(s);}
return s;
}
unsigned long
tiffFile::Get_ULong()
{
unsigned long l;
Get_Data((unsigned char *)&l, 4);
if (bigendian) {return ntohl(l);}
return l;
}
signed char
tiffFile::Get_SByte()
{
signed char b;
Get_Data((unsigned char *)&b, 1);
return b;
}
signed short
tiffFile::Get_SShort()
{
signed short s;
Get_Data((unsigned char *)&s, 2);
if (bigendian) {return ntohs(s);}
return s;
}
signed long
tiffFile::Get_SLong()
{
signed long l;
Get_Data((unsigned char *)&l, 4);
if (bigendian) {return ntohl(l);}
return l;
}
IFD
tiffFile::Get_IFD(unsigned long ofs, unsigned long tagofs)
{
return IFD(*this, ofs, tagofs);
}
IFD
tiffFile::Get_IFD()
{
return IFD(*this, First_IFD());
}
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