picexif.h

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#ifndef __exif_h__
#define __exif_h__
 
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include <stdio.h>
 
#define MAX_COMMENT 1000
#define MAX_SECTIONS 20
#define THUMBNAILTMPFILE "/tmp/.thumbcache"
 
typedef struct tag_ExifInfo {
  char  Version        [5];
  char  CameraMake     [32];
  char  CameraModel    [40];
  char  DateTime       [20];
  char  Orientation    [20];
  char  MeteringMode   [30];
  char  Comments[MAX_COMMENT];
  char  FlashUsed      [20];
  char  IsColor        [5];
  char  ResolutionUnit [20];
  char  ExposureProgram[30];
  char  LightSource    [20];
  float Xresolution;
  float Yresolution;
  float Brightness;
  float ExposureTime;
  float ExposureBias;
  float Distance;
  float CCDWidth;
  float FocalplaneXRes;
  float FocalplaneYRes;
  float FocalplaneUnits;
  float FocalLength;
  float ApertureFNumber;
  int   Height, Width;
  int   CompressionLevel;
  int   ISOequivalent;
  int   Process;
  int   Orient;
  //unsigned char *ThumbnailPointer;
  //unsigned ThumbnailSize;
  bool  IsExif;
  int Thumnailstate;
} EXIFINFO;
 
static const int BytesPerFormat[] = {0,1,1,2,4,8,1,1,2,4,8,4,8};
 
class Cexif
{
  typedef struct tag_Section_t{
  unsigned char* Data;
  int Type;
  unsigned Size;
  } Section_t;
public:
  EXIFINFO* m_exifinfo;
  char m_szLastError[256];
  Cexif();
  ~Cexif();
  bool DecodeExif(const char *filename, int Thumb=0);
  void ClearExif();
protected:
  bool process_EXIF(unsigned char * CharBuf, unsigned int length);
  void process_COM (const unsigned char * Data, int length);
  void process_SOFn (const unsigned char * Data, int marker);
  int Get16u(void * Short);
  int Get16m(void * Short);
  long Get32s(void * Long);
  unsigned long Get32u(void * Long);
  double ConvertAnyFormat(void * ValuePtr, int Format);
  bool ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase, unsigned ExifLength, EXIFINFO * const pInfo, unsigned   char ** const LastExifRefdP);
  int ExifImageWidth;
  int MotorolaOrder;
  Section_t Sections[MAX_SECTIONS];
  int SectionsRead;
  bool freeinfo;
};
 
#endif// __exif_h__