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/***************************************************************************
* fqterm, a terminal emulator for both BBS and *nix. *
* Copyright (C) 2008 fqterm development group. *
* *
* 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., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#ifndef FQTERM_EXIF_EXTRACTOR
#define FQTERM_EXIF_EXTRACTOR
#include "fqterm_trace.h"
#include <map>
#include <string>
#include <cstdint>
namespace FQTerm {
class ExifExtractor
{
public:
enum DATATYPE {ZEORGARD = 0, UNSIGNEDCHAR = 1, ASCIISTRING = 2, UNSIGNEDINT16 = 3, UNSIGNEDINT32 = 4,
UNSIGNEDRATIONAL = 5, SIGNEDCHAR = 6, UNDEFINED = 7, SIGNEDSHORT = 8, SIGNEDLONG = 9, RATIONAL = 10,
SIGNEDFLOAT = 11, DOUBLEFLOAT = 12, MAXGUARD = 13};
ExifExtractor();
~ExifExtractor();
std::string extractExifInfo(std::string fileName);
std::string extractExifInfo(FILE* file);
std::string info();
std::string operator[](const std::string& key);
private:
void postRead();
std::string readInfo();
bool analyzeIFD0TagInfo();
bool analyzeSubIFDTagInfo();
bool readIFD0();
bool readSubIFD();
bool isReadable();
bool checkEndian();
void toggleEndian(void* buf, size_t s);
void reset();
bool read(void* buffer, size_t elementSize, size_t count);
void seek(long offset, int origin);
void rewind();
template<class T>
T gcd(T a, T b) {
if (a == 0 || b == 0)
return a + b;
return gcd(b, a % b);
}
bool toggle_;
std::map<std::string, std::string> exifKeyValuePairs_;
FILE* exifFile_;
uint32_t ifdOffset_;
uint32_t subIfdOffset_;
static const uint16_t IFD0Tag[16];
static const char IFD0TagName[16][30];
static const uint16_t SubIFDTag[38];
static const char SubIFDTagName[38][30];
static const char exifHeaderStandard[6];
std::string exifInformation_;
};
} //namespace FQTerm
#endif
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