//--------------------------------------------------------------------------
// Include file for jhead program.
//
// This include file only defines stuff that goes across modules.
// I like to keep the definitions for macros and structures as close to
// where they get used as possible, so include files only get stuff that
// gets used in more than one file.
//--------------------------------------------------------------------------
#define _CRT_SECURE_NO_DEPRECATE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
//--------------------------------------------------------------------------
#ifdef _WIN32
#include <sys/utime.h>
#else
#include <utime.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#endif
typedef unsigned char uchar;
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
#define MAX_COMMENT_SIZE 2000
#define GPS_PROCESSING_METHOD_LEN 100
#ifdef _WIN32
#define PATH_MAX _MAX_PATH
#define SLASH '\\'
#else
#define SLASH '/'
#endif
//--------------------------------------------------------------------------
// This structure is used to store jpeg file sections in memory.
typedef struct {
uchar * Data;
int Type;
unsigned Offset;
unsigned Size;
}Section_t;
extern int ExifSectionIndex;
extern int DumpExifMap;
#define MAX_DATE_COPIES 10
// Buffer size must large enough to hold maximum location string
// containing six signed integers plus delimeters and terminator,
// i.e.: 11 * 6 + 3(‘/’) + 2(’,’) + 1(\0) = 72
#define MAX_BUF_SIZE 72
// Sub second tag string length (including null termination character), with
// nano-second precision. e.g. 0.123456789s is represented as a null terminated
// string "123456789". Although it can be any length, it is limited to 9 digits
// here as we limit the precision to nano-second.
#define SUB_SEC_SIZE 10
typedef struct {
uint32_t num;
uint32_t denom;
} rat_t;
//--------------------------------------------------------------------------
// This structure stores Exif header image elements in a simple manner
// Used to store camera data as extracted from the various ways that it can be
// stored in an exif header
typedef struct {
char FileName [PATH_MAX+1];
time_t FileDateTime;
unsigned FileSize;
char CameraMake [32];
char CameraModel [40];
char DateTime [20];
char DigitizedTime[20];
// Fractions of seconds for DateTime tag, with milisecond precision.
char SubSecTime[SUB_SEC_SIZE];
// Fractions of seconds for DateTimeOriginal tag, with milisecond precision.
char SubSecTimeOrig[SUB_SEC_SIZE];
// Fractions of seconds for DateTimeDigitized tag, with milisecond precision.
char SubSecTimeDig[SUB_SEC_SIZE];
int Height, Width;
int Orientation;
int IsColor;
int Process;
int FlashUsed;
rat_t FocalLength;
float ExposureTime;
float ApertureFNumber;
float Distance;
float CCDWidth;
float ExposureBias;
float DigitalZoomRatio;
int FocalLength35mmEquiv; // Exif 2.2 tag - usually not present.
int Whitebalance;
int MeteringMode;
int ExposureProgram;
int ExposureMode;
int ISOequivalent;
int LightSource;
int DistanceRange;
char Comments[MAX_COMMENT_SIZE];
int CommentWidchars; // If nonzer, widechar comment, indicates number of chars.
unsigned ThumbnailOffset; // Exif offset to thumbnail
unsigned ThumbnailSize; // Size of thumbnail.
unsigned LargestExifOffset; // Last exif data referenced (to check if thumbnail is at end)
char ThumbnailAtEnd; // Exif header ends with the thumbnail
// (we can only modify the thumbnail if its at the end)
int ThumbnailSizeOffset;
int DateTimeOffsets[MAX_DATE_COPIES];
int numDateTimeTags;
int GpsInfoPresent;
char GpsLat[31];
char GpsLatRaw[MAX_BUF_SIZE];
char GpsLatRef[2];
char GpsLong[31];
char GpsLongRaw[MAX_BUF_SIZE];
char GpsLongRef[2];
char GpsAlt[20];
rat_t GpsAltRaw;
char GpsAltRef;
// gps-datestamp is 11 bytes ascii in EXIF 2.2
char GpsDateStamp[11];
char GpsTimeStamp[11];
char GpsProcessingMethod[GPS_PROCESSING_METHOD_LEN + 1];
}ImageInfo_t;
#define EXIT_FAILURE 1
#define EXIT_SUCCESS 0
// jpgfile.c functions
typedef enum {
READ_METADATA = 1,
READ_IMAGE = 2,
READ_ALL = 3
}ReadMode_t;
typedef struct {
unsigned short Tag; // tag value, i.e. TAG_MODEL
int Format; // format of data
char* Value; // value of data in string format
int DataLength; // length of string when format says Value is a string
int GpsTag; // bool - the tag is related to GPS info
} ExifElement_t;
typedef struct {
unsigned short Tag;
char * Desc;
int Format;
int DataLength; // Number of elements in Format. -1 means any length.
} TagTable_t;
// prototypes for jhead.c functions
void ErrFatal(char * msg);
void ErrNonfatal(char * msg, int a1, int a2);
void FileTimeAsString(char * TimeStr);
// Prototypes for exif.c functions.
int Exif2tm(struct tm * timeptr, char * ExifTime);
void process_EXIF (unsigned char * CharBuf, unsigned int length);
int RemoveThumbnail(unsigned char * ExifSection);
void ShowImageInfo(int ShowFileInfo);
void ShowConciseImageInfo(void);
const char * ClearOrientation(void);
void PrintFormatNumber(void * ValuePtr, int Format, int ByteCount);
double ConvertAnyFormat(void * ValuePtr, int Format);
int Get16u(void * Short);
unsigned Get32u(void * Long);
int Get32s(void * Long);
void Put32u(void * Value, unsigned PutValue);
void create_EXIF(ExifElement_t* elements, int exifTagCount, int gpsTagCount, int hasDateTimeTag);
int TagNameToValue(const char* tagName);
int IsDateTimeTag(unsigned short tag);
//--------------------------------------------------------------------------
// Exif format descriptor stuff
extern const int BytesPerFormat[];
#define NUM_FORMATS 12
#define FMT_BYTE 1
#define FMT_STRING 2
#define FMT_USHORT 3
#define FMT_ULONG 4
#define FMT_URATIONAL 5
#define FMT_SBYTE 6
#define FMT_UNDEFINED 7
#define FMT_SSHORT 8
#define FMT_SLONG 9
#define FMT_SRATIONAL 10
#define FMT_SINGLE 11
#define FMT_DOUBLE 12
// makernote.c prototypes
extern void ProcessMakerNote(unsigned char * DirStart, int ByteCount,
unsigned char * OffsetBase, unsigned ExifLength);
// gpsinfo.c prototypes
void ProcessGpsInfo(unsigned char * ValuePtr, int ByteCount,
unsigned char * OffsetBase, unsigned ExifLength);
int IsGpsTag(const char* tag);
int GpsTagToFormatType(unsigned short tag);
int GpsTagNameToValue(const char* tagName);
TagTable_t* GpsTagToTagTableEntry(unsigned short tag);
static const char ExifAsciiPrefix[] = { 0x41, 0x53, 0x43, 0x49, 0x49, 0x0, 0x0, 0x0 };
// iptc.c prototpyes
void show_IPTC (unsigned char * CharBuf, unsigned int length);
void ShowXmp(Section_t XmpSection);
// Prototypes for myglob.c module
#ifdef _WIN32
void MyGlob(const char * Pattern , void (*FileFuncParm)(const char * FileName));
void SlashToNative(char * Path);
#endif
// Prototypes for paths.c module
int EnsurePathExists(const char * FileName);
void CatPath(char * BasePath, const char * FilePath);
// Prototypes from jpgfile.c
int ReadJpegSections (FILE * infile, ReadMode_t ReadMode);
void DiscardData(void);
void DiscardAllButExif(void);
int ReadJpegFile(const char * FileName, ReadMode_t ReadMode);
int ReplaceThumbnail(const char * ThumbFileName);
int ReplaceThumbnailFromBuffer(const char* Thumb, int ThumbLen);
int SaveThumbnail(char * ThumbFileName);
int RemoveSectionType(int SectionType);
int RemoveUnknownSections(void);
int WriteJpegFile(const char * FileName);
Section_t * FindSection(int SectionType);
Section_t * CreateSection(int SectionType, unsigned char * Data, int size);
void ResetJpgfile(void);
int ReadJpegSectionsFromBuffer (unsigned char* buffer, unsigned int buffer_size, ReadMode_t ReadMode);
int WriteJpegToBuffer(unsigned char* buffer, unsigned int buffer_size);
// Variables from jhead.c used by exif.c
extern ImageInfo_t ImageInfo;
extern int ShowTags;
extern char* formatStr(int format);
//--------------------------------------------------------------------------
// JPEG markers consist of one or more 0xFF bytes, followed by a marker
// code byte (which is not an FF). Here are the marker codes of interest
// in this program. (See jdmarker.c for a more complete list.)
//--------------------------------------------------------------------------
#define M_SOF0 0xC0 // Start Of Frame N
#define M_SOF1 0xC1 // N indicates which compression process
#define M_SOF2 0xC2 // Only SOF0-SOF2 are now in common use
#define M_SOF3 0xC3
#define M_SOF5 0xC5 // NB: codes C4 and CC are NOT SOF markers
#define M_SOF6 0xC6
#define M_SOF7 0xC7
#define M_SOF9 0xC9
#define M_SOF10 0xCA
#define M_SOF11 0xCB
#define M_SOF13 0xCD
#define M_SOF14 0xCE
#define M_SOF15 0xCF
#define M_SOI 0xD8 // Start Of Image (beginning of datastream)
#define M_EOI 0xD9 // End Of Image (end of datastream)
#define M_SOS 0xDA // Start Of Scan (begins compressed data)
#define M_JFIF 0xE0 // Jfif marker
#define M_EXIF 0xE1 // Exif marker. Also used for XMP data!
#define M_XMP 0x10E1 // Not a real tag (same value in file as Exif!)
#define M_COM 0xFE // COMment
#define M_DQT 0xDB
#define M_DHT 0xC4
#define M_DRI 0xDD
#define M_IPTC 0xED // IPTC marker