tif_dir.h

/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifndef _TIFFDIR_
#define _TIFFDIR_

#include "tiff.h"
#include "tiffio.h"

/*
 * ``Library-private'' Directory-related Definitions.
 */

typedef struct
{
    const TIFFField *info;
    int count;
    void *value;
} TIFFTagValue;

/*
 * TIFF Image File Directories are comprised of a table of field
 * descriptors of the form shown below.  The table is sorted in
 * ascending order by tag.  The values associated with each entry are
 * disjoint and may appear anywhere in the file (so long as they are
 * placed on a word boundary).
 *
 * If the value is 4 bytes or less, in ClassicTIFF, or 8 bytes or less in
 * BigTIFF, then it is placed in the offset field to save space. If so,
 * it is left-justified in the offset field.
 */
typedef struct
{
    uint16_t tdir_tag;   /* see below */
    uint16_t tdir_type;  /* data type; see below */
    uint64_t tdir_count; /* number of items; length in spec */
    union
    {
        uint16_t toff_short;
        uint32_t toff_long;
        uint64_t toff_long8;
    } tdir_offset;       /* either offset or the data itself if fits */
    uint8_t tdir_ignore; /* flag status to ignore tag when parsing tags in
                            tif_dirread.c */
} TIFFDirEntry;

typedef struct
{
    uint64_t offset;
    uint64_t length;
} TIFFEntryOffsetAndLength; /* auxiliary for evaluating size of IFD data */

/*
 * Internal format of a TIFF directory entry.
 */
typedef struct
{
#define FIELDSET_ITEMS 4
    /* bit vector of fields that are set */
    uint32_t td_fieldsset[FIELDSET_ITEMS];

    uint32_t td_imagewidth, td_imagelength, td_imagedepth;
    uint32_t td_tilewidth, td_tilelength, td_tiledepth;
    uint32_t td_subfiletype;
    uint16_t td_bitspersample;
    uint16_t td_sampleformat;
    uint16_t td_compression;
    uint16_t td_photometric;
    uint16_t td_threshholding;
    uint16_t td_fillorder;
    uint16_t td_orientation;
    uint16_t td_samplesperpixel;
    uint32_t td_rowsperstrip;
    uint16_t td_minsamplevalue, td_maxsamplevalue;
    double *td_sminsamplevalue;
    double *td_smaxsamplevalue;
    float td_xresolution, td_yresolution;
    uint16_t td_resolutionunit;
    uint16_t td_planarconfig;
    float td_xposition, td_yposition;
    uint16_t td_pagenumber[2];
    uint16_t *td_colormap[3];
    uint16_t td_halftonehints[2];
    uint16_t td_extrasamples;
    uint16_t *td_sampleinfo;
    /* even though the name is misleading, td_stripsperimage is the number
     * of striles (=strips or tiles) per plane, and td_nstrips the total
     * number of striles */
    uint32_t td_stripsperimage;
    uint32_t td_nstrips; /* size of offset & bytecount arrays */
    uint64_t
        *td_stripoffset_p; /* should be accessed with TIFFGetStrileOffset */
    uint64_t *td_stripbytecount_p; /* should be accessed with
                                      TIFFGetStrileByteCount */
    uint32_t
        td_stripoffsetbyteallocsize; /* number of elements currently allocated
                                        for td_stripoffset/td_stripbytecount.
                                        Only used if TIFF_LAZYSTRILELOAD is set
                                      */
#ifdef STRIPBYTECOUNTSORTED_UNUSED
    int td_stripbytecountsorted; /* is the bytecount array sorted ascending? */
#endif
    /* Be aware that the parameters of td_stripoffset_entry and
     * td_stripbytecount_entry are swapped but tdir_offset is not
     * and has to be swapped when used. */
    TIFFDirEntry td_stripoffset_entry;    /* for deferred loading */
    TIFFDirEntry td_stripbytecount_entry; /* for deferred loading */
    uint16_t td_nsubifd;
    uint64_t *td_subifd;
    /* YCbCr parameters */
    uint16_t td_ycbcrsubsampling[2];
    uint16_t td_ycbcrpositioning;
    /* Colorimetry parameters */
    uint16_t *td_transferfunction[3];
    float *td_refblackwhite;
    /* CMYK parameters */
    int td_inknameslen;
    char *td_inknames;
    uint16_t td_numberofinks; /* number of inks in InkNames string */

    int td_customValueCount;
    TIFFTagValue *td_customValues;

    unsigned char
        td_deferstrilearraywriting; /* see TIFFDeferStrileArrayWriting() */

    unsigned char
        td_iswrittentofile; /* indicates if current IFD is present on file */

    /* LibTIFF writes all data that does not fit into the IFD entries directly
     * after the IFD tag entry part. When reading, only the IFD data directly
     * and continuously behind the IFD tags is taken into account for the IFD
     * data size.*/
    uint64_t td_dirdatasize_write; /* auxiliary for evaluating size of IFD data
                                       to be written */
    uint64_t td_dirdatasize_read;  /* auxiliary for evaluating size of IFD data
                                       read from file */
    uint32_t td_dirdatasize_Noffsets; /* auxiliary counter for
                                         tif_dir.td_dirdatasize_offsets array */
    TIFFEntryOffsetAndLength
        *td_dirdatasize_offsets; /* auxiliary array for all offsets of IFD tag
                                    entries with data outside the IFD tag
                                    entries. */
} TIFFDirectory;

/*
 * Field flags used to indicate fields that have been set in a directory, and
 * to reference fields when manipulating a directory.
 */

/*
 * FIELD_IGNORE is used to signify tags that are to be processed but otherwise
 * ignored.  This permits antiquated tags to be quietly read and discarded.
 * Note that a bit *is* allocated for ignored tags; this is understood by the
 * directory reading logic which uses this fact to avoid special-case handling
 */
#define FIELD_IGNORE 0

/* multi-item fields */
#define FIELD_IMAGEDIMENSIONS 1
#define FIELD_TILEDIMENSIONS 2
#define FIELD_RESOLUTION 3
#define FIELD_POSITION 4

/* single-item fields */
#define FIELD_SUBFILETYPE 5
#define FIELD_BITSPERSAMPLE 6
#define FIELD_COMPRESSION 7
#define FIELD_PHOTOMETRIC 8
#define FIELD_THRESHHOLDING 9
#define FIELD_FILLORDER 10
#define FIELD_ORIENTATION 15
#define FIELD_SAMPLESPERPIXEL 16
#define FIELD_ROWSPERSTRIP 17
#define FIELD_MINSAMPLEVALUE 18
#define FIELD_MAXSAMPLEVALUE 19
#define FIELD_PLANARCONFIG 20
#define FIELD_RESOLUTIONUNIT 22
#define FIELD_PAGENUMBER 23
#define FIELD_STRIPBYTECOUNTS 24
#define FIELD_STRIPOFFSETS 25
#define FIELD_COLORMAP 26
#define FIELD_EXTRASAMPLES 31
#define FIELD_SAMPLEFORMAT 32
#define FIELD_SMINSAMPLEVALUE 33
#define FIELD_SMAXSAMPLEVALUE 34
#define FIELD_IMAGEDEPTH 35
#define FIELD_TILEDEPTH 36
#define FIELD_HALFTONEHINTS 37
#define FIELD_YCBCRSUBSAMPLING 39
#define FIELD_YCBCRPOSITIONING 40
#define FIELD_REFBLACKWHITE 41
#define FIELD_TRANSFERFUNCTION 44
#define FIELD_INKNAMES 46
#define FIELD_SUBIFD 49
#define FIELD_NUMBEROFINKS 50
/*      FIELD_CUSTOM (see tiffio.h)    65 */
/* end of support for well-known tags; codec-private tags follow */
#define FIELD_CODEC 66 /* base of codec-private tags */

/*
 * Pseudo-tags don't normally need field bits since they are not written to an
 * output file (by definition). The library also has express logic to always
 * query a codec for a pseudo-tag so allocating a field bit for one is a
 * waste.   If codec wants to promote the notion of a pseudo-tag being ``set''
 * or ``unset'' then it can do using internal state flags without polluting
 * the field bit space defined for real tags.
 */
#define FIELD_PSEUDO 0

#define FIELD_LAST (32 * FIELDSET_ITEMS - 1)

#define BITn(n) (((uint32_t)1L) << ((n)&0x1f))
#define BITFIELDn(tif, n) ((tif)->tif_dir.td_fieldsset[(n) / 32])
#define TIFFFieldSet(tif, field) (BITFIELDn(tif, field) & BITn(field))
#define TIFFSetFieldBit(tif, field) (BITFIELDn(tif, field) |= BITn(field))
#define TIFFClrFieldBit(tif, field) (BITFIELDn(tif, field) &= ~BITn(field))

#define FieldSet(fields, f) (fields[(f) / 32] & BITn(f))
#define ResetFieldBit(fields, f) (fields[(f) / 32] &= ~BITn(f))

typedef enum
{
    TIFF_SETGET_UNDEFINED = 0,
    TIFF_SETGET_ASCII = 1,
    TIFF_SETGET_UINT8 = 2,
    TIFF_SETGET_SINT8 = 3,
    TIFF_SETGET_UINT16 = 4,
    TIFF_SETGET_SINT16 = 5,
    TIFF_SETGET_UINT32 = 6,
    TIFF_SETGET_SINT32 = 7,
    TIFF_SETGET_UINT64 = 8,
    TIFF_SETGET_SINT64 = 9,
    TIFF_SETGET_FLOAT = 10,
    TIFF_SETGET_DOUBLE = 11,
    TIFF_SETGET_IFD8 = 12,
    TIFF_SETGET_INT = 13,
    TIFF_SETGET_UINT16_PAIR = 14,
    TIFF_SETGET_C0_ASCII = 15,
    TIFF_SETGET_C0_UINT8 = 16,
    TIFF_SETGET_C0_SINT8 = 17,
    TIFF_SETGET_C0_UINT16 = 18,
    TIFF_SETGET_C0_SINT16 = 19,
    TIFF_SETGET_C0_UINT32 = 20,
    TIFF_SETGET_C0_SINT32 = 21,
    TIFF_SETGET_C0_UINT64 = 22,
    TIFF_SETGET_C0_SINT64 = 23,
    TIFF_SETGET_C0_FLOAT = 24,
    TIFF_SETGET_C0_DOUBLE = 25,
    TIFF_SETGET_C0_IFD8 = 26,
    TIFF_SETGET_C16_ASCII = 27,
    TIFF_SETGET_C16_UINT8 = 28,
    TIFF_SETGET_C16_SINT8 = 29,
    TIFF_SETGET_C16_UINT16 = 30,
    TIFF_SETGET_C16_SINT16 = 31,
    TIFF_SETGET_C16_UINT32 = 32,
    TIFF_SETGET_C16_SINT32 = 33,
    TIFF_SETGET_C16_UINT64 = 34,
    TIFF_SETGET_C16_SINT64 = 35,
    TIFF_SETGET_C16_FLOAT = 36,
    TIFF_SETGET_C16_DOUBLE = 37,
    TIFF_SETGET_C16_IFD8 = 38,
    TIFF_SETGET_C32_ASCII = 39,
    TIFF_SETGET_C32_UINT8 = 40,
    TIFF_SETGET_C32_SINT8 = 41,
    TIFF_SETGET_C32_UINT16 = 42,
    TIFF_SETGET_C32_SINT16 = 43,
    TIFF_SETGET_C32_UINT32 = 44,
    TIFF_SETGET_C32_SINT32 = 45,
    TIFF_SETGET_C32_UINT64 = 46,
    TIFF_SETGET_C32_SINT64 = 47,
    TIFF_SETGET_C32_FLOAT = 48,
    TIFF_SETGET_C32_DOUBLE = 49,
    TIFF_SETGET_C32_IFD8 = 50,
    TIFF_SETGET_OTHER = 51
} TIFFSetGetFieldType;

#if defined(__cplusplus)
extern "C"
{
#endif

    extern const TIFFFieldArray *_TIFFGetFields(void);
    extern const TIFFFieldArray *_TIFFGetExifFields(void);
    extern const TIFFFieldArray *_TIFFGetGpsFields(void);
    extern void _TIFFSetupFields(TIFF *tif, const TIFFFieldArray *infoarray);
    extern void _TIFFPrintFieldInfo(TIFF *, FILE *);

    extern int _TIFFFillStriles(TIFF *);

    typedef enum
    {
        tfiatImage,
        tfiatExif,
        tfiatGps, /* EXIF-GPS fields array type */
        tfiatOther
    } TIFFFieldArrayType;

    struct _TIFFFieldArray
    {
        TIFFFieldArrayType type; /* array type, will be used to determine if IFD
                                    is image and such */
        uint32_t allocated_size; /* 0 if array is constant, other if modified by
                                    future definition extension support */
        uint32_t count;          /* number of elements in fields array */
        TIFFField *fields;       /* actual field info */
    };

    struct _TIFFField
    {
        uint32_t field_tag;      /* field's tag */
        short field_readcount;   /* read count/TIFF_VARIABLE/TIFF_SPP */
        short field_writecount;  /* write count/TIFF_VARIABLE */
        TIFFDataType field_type; /* type of associated data */
        uint32_t
            field_anonymous; /* if true, this is a unknown / anonymous tag */
        TIFFSetGetFieldType set_field_type; /* type to be passed to TIFFSetField
                                               and TIFFGetField*/
        TIFFSetGetFieldType get_field_type; /* not used */
        unsigned short field_bit;           /* bit in fieldsset bit vector */
        unsigned char field_oktochange;  /* if true, can change while writing */
        unsigned char field_passcount;   /* if true, pass dir count on set */
        char *field_name;                /* ASCII name */
        TIFFFieldArray *field_subfields; /* if field points to child ifds, child
                                            ifd field definition array */
    };

    extern int _TIFFMergeFields(TIFF *, const TIFFField[], uint32_t);
    extern const TIFFField *_TIFFFindOrRegisterField(TIFF *, uint32_t,
                                                     TIFFDataType);
    extern TIFFField *_TIFFCreateAnonField(TIFF *, uint32_t, TIFFDataType);
    extern int _TIFFCheckFieldIsValidForCodec(TIFF *tif, ttag_t tag);
    extern int _TIFFCheckDirNumberAndOffset(TIFF *tif, tdir_t dirn,
                                            uint64_t diroff);
    extern int _TIFFGetDirNumberFromOffset(TIFF *tif, uint64_t diroff,
                                           tdir_t *dirn);
    extern int _TIFFGetOffsetFromDirNumber(TIFF *tif, tdir_t dirn,
                                           uint64_t *diroff);
    extern int _TIFFRemoveEntryFromDirectoryListByOffset(TIFF *tif,
                                                         uint64_t diroff);

#if defined(__cplusplus)
}
#endif
#endif /* _TIFFDIR_ */