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/*
* Copyright (c) 2001-2007, Eric M. Johnston <emj@postal.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Eric M. Johnston.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: exifint.h,v 1.32 2007/12/16 00:48:22 ejohnst Exp $
*/
/*
* Exchangeable image file format (Exif) parser.
*
* Developed using the TIFF 6.0 specification
* (http://partners.adobe.com/asn/developer/pdfs/tn/TIFF6.pdf)
* and the EXIF 2.21 standard: (http://tsc.jeita.or.jp/avs/data/cp3451_1.pdf).
*
* Definitions internal to the Exif parsing library.
*
*/
#ifndef _EXIFINT_H
#define _EXIFINT_H
#include "exif.h"
/* Exif IFD tags. */
#define EXIF_T_EXIFIFD 0x8769
#define EXIF_T_GPSIFD 0x8825
#define EXIF_T_MAKERNOTE 0x927c
#define EXIF_T_INTEROP 0xa005
/* IFD field types. */
struct fieldtype {
u_int16_t type;
const char *name;
size_t size;
};
/* A raw Image File Directory (IFD) entry (12 bytes). */
struct field {
unsigned char tag[2];
unsigned char type[2];
unsigned char count[4];
unsigned char value[4];
};
/* IFD entry. */
struct ifd {
u_int16_t num; /* Number of fields. */
struct field *fields; /* Array of fields. */
struct exifprop *par; /* Parent property association. */
struct exiftag *tagset; /* Tag definitions. */
struct tiffmeta md; /* Metadata. */
struct ifd *next;
};
/* List of IFD offsets, to detect loops. */
struct ifdoff {
unsigned char *offset; /* Offset to IFD. */
struct ifdoff *next; /* Next IFD in list. */
};
/* Macro for making sense of a fraction. */
#define fixfract(str, n, d, t) { \
if ((t)) { (n) /= (t); (d) /= (t); } \
if (!(n)) sprintf((str), "0"); \
else if (!(d)) sprintf((str), "Infinite"); \
else if (abs((n)) == abs((d))) sprintf((str), "%d", (n) / (d)); \
else if (abs((d)) == 1) snprintf((str), 31, "%d", (n) / (d)); \
else if (abs((n)) > abs((d))) snprintf((str), 31, "%.1f", \
(double)(n) / (double)(d)); \
else if (abs((d)) > 2 && abs((n)) > 1 && \
(fabs((double)(n) / (double)(d))) >= 0.1) \
snprintf((str), 31, "%.1f", (double)(n) / (double)(d)); \
else snprintf((str), 31, "%d/%d", (n), (d)); \
}
/* The tables from tagdefs.c. */
extern struct fieldtype ftypes[];
extern struct descrip ucomment[];
extern struct descrip flash_fire[];
extern struct descrip flash_return[];
extern struct descrip flash_mode[];
extern struct descrip flash_func[];
extern struct descrip flash_redeye[];
extern struct descrip filesrcs[];
/* Utility functions from exifutil.c. */
extern int offsanity(struct exifprop *prop, u_int16_t size, struct ifd *dir);
extern u_int16_t exif2byte(unsigned char *b, enum byteorder o);
extern int16_t exif2sbyte(unsigned char *b, enum byteorder o);
extern u_int32_t exif4byte(unsigned char *b, enum byteorder o);
extern void byte4exif(u_int32_t n, unsigned char *b, enum byteorder o);
extern int32_t exif4sbyte(unsigned char *b, enum byteorder o);
extern char *finddescr(struct descrip *table, u_int16_t val);
extern int catdescr(char *c, struct descrip *table, u_int16_t val, int len);
extern struct exifprop *newprop(void);
extern struct exifprop *childprop(struct exifprop *parent);
extern void exifstralloc(char **str, int len);
extern void hexprint(unsigned char *b, int len);
extern void dumpprop(struct exifprop *prop, struct field *afield);
extern struct ifd *readifds(u_int32_t offset, struct exiftag *tagset,
struct tiffmeta *md);
extern u_int32_t readifd(u_int32_t offset, struct ifd **dir,
struct exiftag *tagset, struct tiffmeta *md);
extern u_int32_t gcd(u_int32_t a, u_int32_t b);
/* Interface to exifgps.c. */
extern struct exiftag gpstags[];
extern void gpsprop(struct exifprop *prop, struct exiftags *t);
#endif
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