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Sourcecode: wxwindows2.4 version File versions

tif_dir.c

/* $Header: /pack/cvsroots/wxwindows/wxWindows/src/tiff/tif_dir.c,v 1.1.6.1 2002/11/10 13:13:55 JS Exp $ */

/*
 * 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.
 */

/*
 * TIFF Library.
 *
 * Directory Tag Get & Set Routines.
 * (and also some miscellaneous stuff)
 */
#include "tiffiop.h"

/*
 * These are used in the backwards compatibility code...
 */
#define DATATYPE_VOID         0       /* !untyped data */
#define DATATYPE_INT          1       /* !signed integer data */
#define DATATYPE_UINT         2       /* !unsigned integer data */
#define DATATYPE_IEEEFP       3       /* !IEEE floating point data */

void
_TIFFsetByteArray(void** vpp, void* vp, long n)
{
      if (*vpp)
            _TIFFfree(*vpp), *vpp = 0;
      if (vp && (*vpp = (void*) _TIFFmalloc(n)))
            _TIFFmemcpy(*vpp, vp, n);
}
void _TIFFsetString(char** cpp, char* cp)
    { _TIFFsetByteArray((void**) cpp, (void*) cp, (long) (strlen(cp)+1)); }
void _TIFFsetNString(char** cpp, char* cp, long n)
    { _TIFFsetByteArray((void**) cpp, (void*) cp, n); }
void _TIFFsetShortArray(uint16** wpp, uint16* wp, long n)
    { _TIFFsetByteArray((void**) wpp, (void*) wp, n*sizeof (uint16)); }
void _TIFFsetLongArray(uint32** lpp, uint32* lp, long n)
    { _TIFFsetByteArray((void**) lpp, (void*) lp, n*sizeof (uint32)); }
void _TIFFsetFloatArray(float** fpp, float* fp, long n)
    { _TIFFsetByteArray((void**) fpp, (void*) fp, n*sizeof (float)); }
void _TIFFsetDoubleArray(double** dpp, double* dp, long n)
    { _TIFFsetByteArray((void**) dpp, (void*) dp, n*sizeof (double)); }

/*
 * Install extra samples information.
 */
static int
setExtraSamples(TIFFDirectory* td, va_list ap, int* v)
{
      uint16* va;
      int i;

      *v = va_arg(ap, int);
      if ((uint16) *v > td->td_samplesperpixel)
            return (0);
      va = va_arg(ap, uint16*);
      if (*v > 0 && va == NULL)           /* typically missing param */
            return (0);
      for (i = 0; i < *v; i++)
            if (va[i] > EXTRASAMPLE_UNASSALPHA)
                  return (0);
      td->td_extrasamples = (uint16) *v;
      _TIFFsetShortArray(&td->td_sampleinfo, va, td->td_extrasamples);
      return (1);
}

#ifdef CMYK_SUPPORT
static int
checkInkNamesString(TIFF* tif, int slen, const char* s)
{
      TIFFDirectory* td = &tif->tif_dir;
      int i = td->td_samplesperpixel;

      if (slen > 0) {
            const char* ep = s+slen;
            const char* cp = s;
            for (; i > 0; i--) {
                  for (; *cp != '\0'; cp++)
                        if (cp >= ep)
                              goto bad;
                  cp++;                   /* skip \0 */
            }
            return (cp-s);
      }
bad:
      TIFFError("TIFFSetField",
          "%s: Invalid InkNames value; expecting %d names, found %d",
          tif->tif_name,
          td->td_samplesperpixel,
          td->td_samplesperpixel-i);
      return (0);
}
#endif

static int
_TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
{
      TIFFDirectory* td = &tif->tif_dir;
      int status = 1;
      uint32 v32;
      int i, v;
      double d;
      char* s;

      switch (tag) {
      case TIFFTAG_SUBFILETYPE:
            td->td_subfiletype = va_arg(ap, uint32);
            break;
      case TIFFTAG_IMAGEWIDTH:
            td->td_imagewidth = va_arg(ap, uint32);
            break;
      case TIFFTAG_IMAGELENGTH:
            td->td_imagelength = va_arg(ap, uint32);
            break;
      case TIFFTAG_BITSPERSAMPLE:
            td->td_bitspersample = (uint16) va_arg(ap, int);
            /*
             * If the data require post-decoding processing
             * to byte-swap samples, set it up here.  Note
             * that since tags are required to be ordered,
             * compression code can override this behaviour
             * in the setup method if it wants to roll the
             * post decoding work in with its normal work.
             */
            if (tif->tif_flags & TIFF_SWAB) {
                  if (td->td_bitspersample == 16)
                        tif->tif_postdecode = _TIFFSwab16BitData;
                  else if (td->td_bitspersample == 32)
                        tif->tif_postdecode = _TIFFSwab32BitData;
                  else if (td->td_bitspersample == 64)
                        tif->tif_postdecode = _TIFFSwab64BitData;
            }
            break;
      case TIFFTAG_COMPRESSION:
            v = va_arg(ap, int) & 0xffff;
            /*
             * If we're changing the compression scheme,
             * the notify the previous module so that it
             * can cleanup any state it's setup.
             */
            if (TIFFFieldSet(tif, FIELD_COMPRESSION)) {
                  if (td->td_compression == v)
                        break;
                  (*tif->tif_cleanup)(tif);
                  tif->tif_flags &= ~TIFF_CODERSETUP;
            }
            /*
             * Setup new compression routine state.
             */
            if( (status = TIFFSetCompressionScheme(tif, v)) != 0 )
                  td->td_compression = v;
            break;
      case TIFFTAG_PHOTOMETRIC:
            td->td_photometric = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_THRESHHOLDING:
            td->td_threshholding = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_FILLORDER:
            v = va_arg(ap, int);
            if (v != FILLORDER_LSB2MSB && v != FILLORDER_MSB2LSB)
                  goto badvalue;
            td->td_fillorder = (uint16) v;
            break;
      case TIFFTAG_DOCUMENTNAME:
            _TIFFsetString(&td->td_documentname, va_arg(ap, char*));
            break;
      case TIFFTAG_ARTIST:
            _TIFFsetString(&td->td_artist, va_arg(ap, char*));
            break;
      case TIFFTAG_DATETIME:
            _TIFFsetString(&td->td_datetime, va_arg(ap, char*));
            break;
      case TIFFTAG_HOSTCOMPUTER:
            _TIFFsetString(&td->td_hostcomputer, va_arg(ap, char*));
            break;
      case TIFFTAG_IMAGEDESCRIPTION:
            _TIFFsetString(&td->td_imagedescription, va_arg(ap, char*));
            break;
      case TIFFTAG_MAKE:
            _TIFFsetString(&td->td_make, va_arg(ap, char*));
            break;
      case TIFFTAG_MODEL:
            _TIFFsetString(&td->td_model, va_arg(ap, char*));
            break;
      case TIFFTAG_SOFTWARE:
            _TIFFsetString(&td->td_software, va_arg(ap, char*));
            break;
      case TIFFTAG_ORIENTATION:
            v = va_arg(ap, int);
            if (v < ORIENTATION_TOPLEFT || ORIENTATION_LEFTBOT < v) {
                  TIFFWarning(tif->tif_name,
                      "Bad value %ld for \"%s\" tag ignored",
                      v, _TIFFFieldWithTag(tif, tag)->field_name);
            } else
                  td->td_orientation = (uint16) v;
            break;
      case TIFFTAG_SAMPLESPERPIXEL:
            /* XXX should cross check -- e.g. if pallette, then 1 */
            v = va_arg(ap, int);
            if (v == 0)
                  goto badvalue;
            td->td_samplesperpixel = (uint16) v;
            break;
      case TIFFTAG_ROWSPERSTRIP:
            v32 = va_arg(ap, uint32);
            if (v32 == 0)
                  goto badvalue32;
            td->td_rowsperstrip = v32;
            if (!TIFFFieldSet(tif, FIELD_TILEDIMENSIONS)) {
                  td->td_tilelength = v32;
                  td->td_tilewidth = td->td_imagewidth;
            }
            break;
      case TIFFTAG_MINSAMPLEVALUE:
            td->td_minsamplevalue = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_MAXSAMPLEVALUE:
            td->td_maxsamplevalue = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_SMINSAMPLEVALUE:
            td->td_sminsamplevalue = (double) va_arg(ap, dblparam_t);
            break;
      case TIFFTAG_SMAXSAMPLEVALUE:
            td->td_smaxsamplevalue = (double) va_arg(ap, dblparam_t);
            break;
      case TIFFTAG_XRESOLUTION:
            td->td_xresolution = (float) va_arg(ap, dblparam_t);
            break;
      case TIFFTAG_YRESOLUTION:
            td->td_yresolution = (float) va_arg(ap, dblparam_t);
            break;
      case TIFFTAG_PLANARCONFIG:
            v = va_arg(ap, int);
            if (v != PLANARCONFIG_CONTIG && v != PLANARCONFIG_SEPARATE)
                  goto badvalue;
            td->td_planarconfig = (uint16) v;
            break;
      case TIFFTAG_PAGENAME:
            _TIFFsetString(&td->td_pagename, va_arg(ap, char*));
            break;
      case TIFFTAG_XPOSITION:
            td->td_xposition = (float) va_arg(ap, dblparam_t);
            break;
      case TIFFTAG_YPOSITION:
            td->td_yposition = (float) va_arg(ap, dblparam_t);
            break;
      case TIFFTAG_RESOLUTIONUNIT:
            v = va_arg(ap, int);
            if (v < RESUNIT_NONE || RESUNIT_CENTIMETER < v)
                  goto badvalue;
            td->td_resolutionunit = (uint16) v;
            break;
      case TIFFTAG_PAGENUMBER:
            td->td_pagenumber[0] = (uint16) va_arg(ap, int);
            td->td_pagenumber[1] = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_HALFTONEHINTS:
            td->td_halftonehints[0] = (uint16) va_arg(ap, int);
            td->td_halftonehints[1] = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_COLORMAP:
            v32 = (uint32)(1L<<td->td_bitspersample);
            _TIFFsetShortArray(&td->td_colormap[0], va_arg(ap, uint16*), v32);
            _TIFFsetShortArray(&td->td_colormap[1], va_arg(ap, uint16*), v32);
            _TIFFsetShortArray(&td->td_colormap[2], va_arg(ap, uint16*), v32);
            break;
      case TIFFTAG_EXTRASAMPLES:
            if (!setExtraSamples(td, ap, &v))
                  goto badvalue;
            break;
      case TIFFTAG_MATTEING:
            td->td_extrasamples = (uint16) (va_arg(ap, int) != 0);
            if (td->td_extrasamples) {
                  uint16 sv = EXTRASAMPLE_ASSOCALPHA;
                  _TIFFsetShortArray(&td->td_sampleinfo, &sv, 1);
            }
            break;
      case TIFFTAG_TILEWIDTH:
            v32 = va_arg(ap, uint32);
            if (v32 % 16) {
                  if (tif->tif_mode != O_RDONLY)
                        goto badvalue32;
                  TIFFWarning(tif->tif_name,
                      "Nonstandard tile width %d, convert file", v32);
            }
            td->td_tilewidth = v32;
            tif->tif_flags |= TIFF_ISTILED;
            break;
      case TIFFTAG_TILELENGTH:
            v32 = va_arg(ap, uint32);
            if (v32 % 16) {
                  if (tif->tif_mode != O_RDONLY)
                        goto badvalue32;
                  TIFFWarning(tif->tif_name,
                      "Nonstandard tile length %d, convert file", v32);
            }
            td->td_tilelength = v32;
            tif->tif_flags |= TIFF_ISTILED;
            break;
      case TIFFTAG_TILEDEPTH:
            v32 = va_arg(ap, uint32);
            if (v32 == 0)
                  goto badvalue32;
            td->td_tiledepth = v32;
            break;
      case TIFFTAG_DATATYPE:
            v = va_arg(ap, int);
            switch (v) {
            case DATATYPE_VOID:     v = SAMPLEFORMAT_VOID;  break;
            case DATATYPE_INT:      v = SAMPLEFORMAT_INT;   break;
            case DATATYPE_UINT:     v = SAMPLEFORMAT_UINT;  break;
            case DATATYPE_IEEEFP:   v = SAMPLEFORMAT_IEEEFP;break;
            default:          goto badvalue;
            }
            td->td_sampleformat = (uint16) v;
            break;
      case TIFFTAG_SAMPLEFORMAT:
            v = va_arg(ap, int);
            if (v < SAMPLEFORMAT_UINT || SAMPLEFORMAT_VOID < v)
                  goto badvalue;
            td->td_sampleformat = (uint16) v;
            break;
      case TIFFTAG_IMAGEDEPTH:
            td->td_imagedepth = va_arg(ap, uint32);
            break;
      case TIFFTAG_STONITS:
            d = va_arg(ap, dblparam_t);
            if (d <= 0.)
                  goto badvaluedbl;
            td->td_stonits = d;
            break;
#if SUBIFD_SUPPORT
      case TIFFTAG_SUBIFD:
            if ((tif->tif_flags & TIFF_INSUBIFD) == 0) {
                  td->td_nsubifd = (uint16) va_arg(ap, int);
                  _TIFFsetLongArray(&td->td_subifd, va_arg(ap, uint32*),
                      (long) td->td_nsubifd);
            } else {
                  TIFFError(tif->tif_name, "Sorry, cannot nest SubIFDs");
                  status = 0;
            }
            break;
#endif
#ifdef YCBCR_SUPPORT
      case TIFFTAG_YCBCRCOEFFICIENTS:
            _TIFFsetFloatArray(&td->td_ycbcrcoeffs, va_arg(ap, float*), 3);
            break;
      case TIFFTAG_YCBCRPOSITIONING:
            td->td_ycbcrpositioning = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_YCBCRSUBSAMPLING:
            td->td_ycbcrsubsampling[0] = (uint16) va_arg(ap, int);
            td->td_ycbcrsubsampling[1] = (uint16) va_arg(ap, int);
            break;
#endif
#ifdef COLORIMETRY_SUPPORT
      case TIFFTAG_WHITEPOINT:
            _TIFFsetFloatArray(&td->td_whitepoint, va_arg(ap, float*), 2);
            break;
      case TIFFTAG_PRIMARYCHROMATICITIES:
            _TIFFsetFloatArray(&td->td_primarychromas, va_arg(ap, float*), 6);
            break;
      case TIFFTAG_TRANSFERFUNCTION:
            v = (td->td_samplesperpixel - td->td_extrasamples) > 1 ? 3 : 1;
            for (i = 0; i < v; i++)
                  _TIFFsetShortArray(&td->td_transferfunction[i],
                      va_arg(ap, uint16*), 1L<<td->td_bitspersample);
            break;
      case TIFFTAG_REFERENCEBLACKWHITE:
            /* XXX should check for null range */
            _TIFFsetFloatArray(&td->td_refblackwhite, va_arg(ap, float*), 6);
            break;
#endif
#ifdef CMYK_SUPPORT
      case TIFFTAG_INKSET:
            td->td_inkset = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_DOTRANGE:
            /* XXX should check for null range */
            td->td_dotrange[0] = (uint16) va_arg(ap, int);
            td->td_dotrange[1] = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_INKNAMES:
            i = va_arg(ap, int);
            s = va_arg(ap, char*);
            i = checkInkNamesString(tif, i, s);
                status = i > 0;
            if( i > 0 ) {
                  _TIFFsetNString(&td->td_inknames, s, i);
                  td->td_inknameslen = i;
            }
            break;
      case TIFFTAG_NUMBEROFINKS:
            td->td_ninks = (uint16) va_arg(ap, int);
            break;
      case TIFFTAG_TARGETPRINTER:
            _TIFFsetString(&td->td_targetprinter, va_arg(ap, char*));
            break;
#endif
#ifdef ICC_SUPPORT
      case TIFFTAG_ICCPROFILE:
            td->td_profileLength = (uint32) va_arg(ap, uint32);
            _TIFFsetByteArray(&td->td_profileData, va_arg(ap, void*),
                td->td_profileLength);
            break;
#endif
#ifdef PHOTOSHOP_SUPPORT
      case TIFFTAG_PHOTOSHOP:
            td->td_photoshopLength = (uint32) va_arg(ap, uint32);
            _TIFFsetByteArray (&td->td_photoshopData, va_arg(ap, void*),
                  td->td_photoshopLength);
            break;
#endif
#ifdef IPTC_SUPPORT
    case TIFFTAG_RICHTIFFIPTC: 
            td->td_richtiffiptcLength = (uint32) va_arg(ap, uint32);
#ifdef PHOTOSHOP_SUPPORT
            _TIFFsetLongArray ((uint32**)&td->td_richtiffiptcData, va_arg(ap, uint32*),
                  td->td_richtiffiptcLength);
#else
            _TIFFsetByteArray (&td->td_photoshopData, va_arg(ap, void*),
                  td->td_photoshopLength);
#endif
            break;
#endif
      default:
            /*
             * This can happen if multiple images are open with
             * different codecs which have private tags.  The
             * global tag information table may then have tags
             * that are valid for one file but not the other. 
             * If the client tries to set a tag that is not valid
             * for the image's codec then we'll arrive here.  This
             * happens, for example, when tiffcp is used to convert
             * between compression schemes and codec-specific tags
             * are blindly copied.
             */
            TIFFError("TIFFSetField",
                "%s: Invalid %stag \"%s\" (not supported by codec)",
                tif->tif_name, isPseudoTag(tag) ? "pseduo-" : "",
                _TIFFFieldWithTag(tif, tag)->field_name);
            status = 0;
            break;
      }
      if (status) {
            TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
            tif->tif_flags |= TIFF_DIRTYDIRECT;
      }
      va_end(ap);
      return (status);
badvalue:
      TIFFError(tif->tif_name, "%d: Bad value for \"%s\"", v,
          _TIFFFieldWithTag(tif, tag)->field_name);
      va_end(ap);
      return (0);
badvalue32:
      TIFFError(tif->tif_name, "%ld: Bad value for \"%s\"", v32,
          _TIFFFieldWithTag(tif, tag)->field_name);
      va_end(ap);
      return (0);
badvaluedbl:
      TIFFError(tif->tif_name, "%f: Bad value for \"%s\"", d,
          _TIFFFieldWithTag(tif, tag)->field_name);
      va_end(ap);
      return (0);
}

/*
 * Return 1/0 according to whether or not
 * it is permissible to set the tag's value.
 * Note that we allow ImageLength to be changed
 * so that we can append and extend to images.
 * Any other tag may not be altered once writing
 * has commenced, unless its value has no effect
 * on the format of the data that is written.
 */
static int
OkToChangeTag(TIFF* tif, ttag_t tag)
{
      const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
      if (!fip) {             /* unknown tag */
            TIFFError("TIFFSetField", "%s: Unknown %stag %u",
                tif->tif_name, isPseudoTag(tag) ? "pseudo-" : "", tag);
            return (0);
      }
      if (tag != TIFFTAG_IMAGELENGTH && (tif->tif_flags & TIFF_BEENWRITING) &&
          !fip->field_oktochange) {
            /*
             * Consult info table to see if tag can be changed
             * after we've started writing.  We only allow changes
             * to those tags that don't/shouldn't affect the
             * compression and/or format of the data.
             */
            TIFFError("TIFFSetField",
                "%s: Cannot modify tag \"%s\" while writing",
                tif->tif_name, fip->field_name);
            return (0);
      }
      return (1);
}

/*
 * Record the value of a field in the
 * internal directory structure.  The
 * field will be written to the file
 * when/if the directory structure is
 * updated.
 */
int
TIFFSetField(TIFF* tif, ttag_t tag, ...)
{
      va_list ap;
      int status;

      va_start(ap, tag);
      status = TIFFVSetField(tif, tag, ap);
      va_end(ap);
      return (status);
}

/*
 * Like TIFFSetField, but taking a varargs
 * parameter list.  This routine is useful
 * for building higher-level interfaces on
 * top of the library.
 */
int
TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
{
      return OkToChangeTag(tif, tag) ?
          (*tif->tif_vsetfield)(tif, tag, ap) : 0;
}

static int
_TIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)
{
      TIFFDirectory* td = &tif->tif_dir;

      switch (tag) {
      case TIFFTAG_SUBFILETYPE:
            *va_arg(ap, uint32*) = td->td_subfiletype;
            break;
      case TIFFTAG_IMAGEWIDTH:
            *va_arg(ap, uint32*) = td->td_imagewidth;
            break;
      case TIFFTAG_IMAGELENGTH:
            *va_arg(ap, uint32*) = td->td_imagelength;
            break;
      case TIFFTAG_BITSPERSAMPLE:
            *va_arg(ap, uint16*) = td->td_bitspersample;
            break;
      case TIFFTAG_COMPRESSION:
            *va_arg(ap, uint16*) = td->td_compression;
            break;
      case TIFFTAG_PHOTOMETRIC:
            *va_arg(ap, uint16*) = td->td_photometric;
            break;
      case TIFFTAG_THRESHHOLDING:
            *va_arg(ap, uint16*) = td->td_threshholding;
            break;
      case TIFFTAG_FILLORDER:
            *va_arg(ap, uint16*) = td->td_fillorder;
            break;
      case TIFFTAG_DOCUMENTNAME:
            *va_arg(ap, char**) = td->td_documentname;
            break;
      case TIFFTAG_ARTIST:
            *va_arg(ap, char**) = td->td_artist;
            break;
      case TIFFTAG_DATETIME:
            *va_arg(ap, char**) = td->td_datetime;
            break;
      case TIFFTAG_HOSTCOMPUTER:
            *va_arg(ap, char**) = td->td_hostcomputer;
            break;
      case TIFFTAG_IMAGEDESCRIPTION:
            *va_arg(ap, char**) = td->td_imagedescription;
            break;
      case TIFFTAG_MAKE:
            *va_arg(ap, char**) = td->td_make;
            break;
      case TIFFTAG_MODEL:
            *va_arg(ap, char**) = td->td_model;
            break;
      case TIFFTAG_SOFTWARE:
            *va_arg(ap, char**) = td->td_software;
            break;
      case TIFFTAG_ORIENTATION:
            *va_arg(ap, uint16*) = td->td_orientation;
            break;
      case TIFFTAG_SAMPLESPERPIXEL:
            *va_arg(ap, uint16*) = td->td_samplesperpixel;
            break;
      case TIFFTAG_ROWSPERSTRIP:
            *va_arg(ap, uint32*) = td->td_rowsperstrip;
            break;
      case TIFFTAG_MINSAMPLEVALUE:
            *va_arg(ap, uint16*) = td->td_minsamplevalue;
            break;
      case TIFFTAG_MAXSAMPLEVALUE:
            *va_arg(ap, uint16*) = td->td_maxsamplevalue;
            break;
      case TIFFTAG_SMINSAMPLEVALUE:
            *va_arg(ap, double*) = td->td_sminsamplevalue;
            break;
      case TIFFTAG_SMAXSAMPLEVALUE:
            *va_arg(ap, double*) = td->td_smaxsamplevalue;
            break;
      case TIFFTAG_XRESOLUTION:
            *va_arg(ap, float*) = td->td_xresolution;
            break;
      case TIFFTAG_YRESOLUTION:
            *va_arg(ap, float*) = td->td_yresolution;
            break;
      case TIFFTAG_PLANARCONFIG:
            *va_arg(ap, uint16*) = td->td_planarconfig;
            break;
      case TIFFTAG_XPOSITION:
            *va_arg(ap, float*) = td->td_xposition;
            break;
      case TIFFTAG_YPOSITION:
            *va_arg(ap, float*) = td->td_yposition;
            break;
      case TIFFTAG_PAGENAME:
            *va_arg(ap, char**) = td->td_pagename;
            break;
      case TIFFTAG_RESOLUTIONUNIT:
            *va_arg(ap, uint16*) = td->td_resolutionunit;
            break;
      case TIFFTAG_PAGENUMBER:
            *va_arg(ap, uint16*) = td->td_pagenumber[0];
            *va_arg(ap, uint16*) = td->td_pagenumber[1];
            break;
      case TIFFTAG_HALFTONEHINTS:
            *va_arg(ap, uint16*) = td->td_halftonehints[0];
            *va_arg(ap, uint16*) = td->td_halftonehints[1];
            break;
      case TIFFTAG_COLORMAP:
            *va_arg(ap, uint16**) = td->td_colormap[0];
            *va_arg(ap, uint16**) = td->td_colormap[1];
            *va_arg(ap, uint16**) = td->td_colormap[2];
            break;
      case TIFFTAG_STRIPOFFSETS:
      case TIFFTAG_TILEOFFSETS:
            *va_arg(ap, uint32**) = td->td_stripoffset;
            break;
      case TIFFTAG_STRIPBYTECOUNTS:
      case TIFFTAG_TILEBYTECOUNTS:
            *va_arg(ap, uint32**) = td->td_stripbytecount;
            break;
      case TIFFTAG_MATTEING:
            *va_arg(ap, uint16*) =
                (td->td_extrasamples == 1 &&
                 td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
            break;
      case TIFFTAG_EXTRASAMPLES:
            *va_arg(ap, uint16*) = td->td_extrasamples;
            *va_arg(ap, uint16**) = td->td_sampleinfo;
            break;
      case TIFFTAG_TILEWIDTH:
            *va_arg(ap, uint32*) = td->td_tilewidth;
            break;
      case TIFFTAG_TILELENGTH:
            *va_arg(ap, uint32*) = td->td_tilelength;
            break;
      case TIFFTAG_TILEDEPTH:
            *va_arg(ap, uint32*) = td->td_tiledepth;
            break;
      case TIFFTAG_DATATYPE:
            switch (td->td_sampleformat) {
            case SAMPLEFORMAT_UINT:
                  *va_arg(ap, uint16*) = DATATYPE_UINT;
                  break;
            case SAMPLEFORMAT_INT:
                  *va_arg(ap, uint16*) = DATATYPE_INT;
                  break;
            case SAMPLEFORMAT_IEEEFP:
                  *va_arg(ap, uint16*) = DATATYPE_IEEEFP;
                  break;
            case SAMPLEFORMAT_VOID:
                  *va_arg(ap, uint16*) = DATATYPE_VOID;
                  break;
            }
            break;
      case TIFFTAG_SAMPLEFORMAT:
            *va_arg(ap, uint16*) = td->td_sampleformat;
            break;
      case TIFFTAG_IMAGEDEPTH:
            *va_arg(ap, uint32*) = td->td_imagedepth;
            break;
      case TIFFTAG_STONITS:
            *va_arg(ap, double*) = td->td_stonits;
            break;
#if SUBIFD_SUPPORT
      case TIFFTAG_SUBIFD:
            *va_arg(ap, uint16*) = td->td_nsubifd;
            *va_arg(ap, uint32**) = td->td_subifd;
            break;
#endif
#ifdef YCBCR_SUPPORT
      case TIFFTAG_YCBCRCOEFFICIENTS:
            *va_arg(ap, float**) = td->td_ycbcrcoeffs;
            break;
      case TIFFTAG_YCBCRPOSITIONING:
            *va_arg(ap, uint16*) = td->td_ycbcrpositioning;
            break;
      case TIFFTAG_YCBCRSUBSAMPLING:
            *va_arg(ap, uint16*) = td->td_ycbcrsubsampling[0];
            *va_arg(ap, uint16*) = td->td_ycbcrsubsampling[1];
            break;
#endif
#ifdef COLORIMETRY_SUPPORT
      case TIFFTAG_WHITEPOINT:
            *va_arg(ap, float**) = td->td_whitepoint;
            break;
      case TIFFTAG_PRIMARYCHROMATICITIES:
            *va_arg(ap, float**) = td->td_primarychromas;
            break;
      case TIFFTAG_TRANSFERFUNCTION:
            *va_arg(ap, uint16**) = td->td_transferfunction[0];
            if (td->td_samplesperpixel - td->td_extrasamples > 1) {
                  *va_arg(ap, uint16**) = td->td_transferfunction[1];
                  *va_arg(ap, uint16**) = td->td_transferfunction[2];
            }
            break;
      case TIFFTAG_REFERENCEBLACKWHITE:
            *va_arg(ap, float**) = td->td_refblackwhite;
            break;
#endif
#ifdef CMYK_SUPPORT
      case TIFFTAG_INKSET:
            *va_arg(ap, uint16*) = td->td_inkset;
            break;
      case TIFFTAG_DOTRANGE:
            *va_arg(ap, uint16*) = td->td_dotrange[0];
            *va_arg(ap, uint16*) = td->td_dotrange[1];
            break;
      case TIFFTAG_INKNAMES:
            *va_arg(ap, char**) = td->td_inknames;
            break;
      case TIFFTAG_NUMBEROFINKS:
            *va_arg(ap, uint16*) = td->td_ninks;
            break;
      case TIFFTAG_TARGETPRINTER:
            *va_arg(ap, char**) = td->td_targetprinter;
            break;
#endif
#ifdef ICC_SUPPORT
      case TIFFTAG_ICCPROFILE:
            *va_arg(ap, uint32*) = td->td_profileLength;
            *va_arg(ap, void**) = td->td_profileData;
            break;
#endif
#ifdef PHOTOSHOP_SUPPORT
      case TIFFTAG_PHOTOSHOP:
            *va_arg(ap, uint32*) = td->td_photoshopLength;
            *va_arg(ap, void**) = td->td_photoshopData;
            break;
#endif
#ifdef IPTC_SUPPORT
      case TIFFTAG_RICHTIFFIPTC:
            *va_arg(ap, uint32*) = td->td_richtiffiptcLength;
            *va_arg(ap, void**) = td->td_richtiffiptcData;
            break;
#endif
      default:
            /*
             * This can happen if multiple images are open with
             * different codecs which have private tags.  The
             * global tag information table may then have tags
             * that are valid for one file but not the other. 
             * If the client tries to get a tag that is not valid
             * for the image's codec then we'll arrive here.
             */
            TIFFError("TIFFGetField",
                "%s: Invalid %stag \"%s\" (not supported by codec)",
                tif->tif_name, isPseudoTag(tag) ? "pseudo-" : "",
                _TIFFFieldWithTag(tif, tag)->field_name);
            break;
      }
      return (1);
}

/*
 * Return the value of a field in the
 * internal directory structure.
 */
int
TIFFGetField(TIFF* tif, ttag_t tag, ...)
{
      int status;
      va_list ap;

      va_start(ap, tag);
      status = TIFFVGetField(tif, tag, ap);
      va_end(ap);
      return (status);
}

/*
 * Like TIFFGetField, but taking a varargs
 * parameter list.  This routine is useful
 * for building higher-level interfaces on
 * top of the library.
 */
int
TIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)
{
      const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
      return (fip && (isPseudoTag(tag) || TIFFFieldSet(tif, fip->field_bit)) ?
          (*tif->tif_vgetfield)(tif, tag, ap) : 0);
}

#define     CleanupField(member) {        \
    if (td->member) {               \
      _TIFFfree(td->member);        \
      td->member = 0;               \
    }                         \
}

/*
 * Release storage associated with a directory.
 */
void
TIFFFreeDirectory(TIFF* tif)
{
      register TIFFDirectory *td = &tif->tif_dir;

      CleanupField(td_colormap[0]);
      CleanupField(td_colormap[1]);
      CleanupField(td_colormap[2]);
      CleanupField(td_documentname);
      CleanupField(td_artist);
      CleanupField(td_datetime);
      CleanupField(td_hostcomputer);
      CleanupField(td_imagedescription);
      CleanupField(td_make);
      CleanupField(td_model);
      CleanupField(td_software);
      CleanupField(td_pagename);
      CleanupField(td_sampleinfo);
#if SUBIFD_SUPPORT
      CleanupField(td_subifd);
#endif
#ifdef YCBCR_SUPPORT
      CleanupField(td_ycbcrcoeffs);
#endif
#ifdef CMYK_SUPPORT
      CleanupField(td_inknames);
      CleanupField(td_targetprinter);
#endif
#ifdef COLORIMETRY_SUPPORT
      CleanupField(td_whitepoint);
      CleanupField(td_primarychromas);
      CleanupField(td_refblackwhite);
      CleanupField(td_transferfunction[0]);
      CleanupField(td_transferfunction[1]);
      CleanupField(td_transferfunction[2]);
#endif
#ifdef ICC_SUPPORT
      CleanupField(td_profileData);
#endif
#ifdef PHOTOSHOP_SUPPORT
      CleanupField(td_photoshopData);
#endif
#ifdef IPTC_SUPPORT
      CleanupField(td_richtiffiptcData);
#endif
      CleanupField(td_stripoffset);
      CleanupField(td_stripbytecount);
}
#undef CleanupField

/*
 * Client Tag extension support (from Niles Ritter).
 */
static TIFFExtendProc _TIFFextender = (TIFFExtendProc) NULL;

TIFFExtendProc
TIFFSetTagExtender(TIFFExtendProc extender)
{
      TIFFExtendProc prev = _TIFFextender;
      _TIFFextender = extender;
      return (prev);
}

/*
 * Setup a default directory structure.
 */
int
TIFFDefaultDirectory(TIFF* tif)
{
      register TIFFDirectory* td = &tif->tif_dir;

      _TIFFSetupFieldInfo(tif);
      _TIFFmemset(td, 0, sizeof (*td));
      td->td_fillorder = FILLORDER_MSB2LSB;
      td->td_bitspersample = 1;
      td->td_threshholding = THRESHHOLD_BILEVEL;
      td->td_orientation = ORIENTATION_TOPLEFT;
      td->td_samplesperpixel = 1;
      td->td_rowsperstrip = (uint32) -1;
      td->td_tilewidth = (uint32) -1;
      td->td_tilelength = (uint32) -1;
      td->td_tiledepth = 1;
      td->td_resolutionunit = RESUNIT_INCH;
      td->td_sampleformat = SAMPLEFORMAT_VOID;
      td->td_imagedepth = 1;
#ifdef YCBCR_SUPPORT
      td->td_ycbcrsubsampling[0] = 2;
      td->td_ycbcrsubsampling[1] = 2;
      td->td_ycbcrpositioning = YCBCRPOSITION_CENTERED;
#endif
#ifdef CMYK_SUPPORT
      td->td_inkset = INKSET_CMYK;
      td->td_ninks = 4;
#endif
      tif->tif_postdecode = _TIFFNoPostDecode;
      tif->tif_vsetfield = _TIFFVSetField;
      tif->tif_vgetfield = _TIFFVGetField;
      tif->tif_printdir = NULL;
      /*
       *  Give client code a chance to install their own
       *  tag extensions & methods, prior to compression overloads.
       */
      if (_TIFFextender)
            (*_TIFFextender)(tif);
      (void) TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
      /*
       * NB: The directory is marked dirty as a result of setting
       * up the default compression scheme.  However, this really
       * isn't correct -- we want TIFF_DIRTYDIRECT to be set only
       * if the user does something.  We could just do the setup
       * by hand, but it seems better to use the normal mechanism
       * (i.e. TIFFSetField).
       */
      tif->tif_flags &= ~TIFF_DIRTYDIRECT;
      return (1);
}

static int
TIFFAdvanceDirectory(TIFF* tif, uint32* nextdir, toff_t* off)
{
      static const char module[] = "TIFFAdvanceDirectory";
      uint16 dircount;

      if (!SeekOK(tif, *nextdir) ||
          !ReadOK(tif, &dircount, sizeof (uint16))) {
            TIFFError(module, "%s: Error fetching directory count",
                tif->tif_name);
            return (0);
      }
      if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabShort(&dircount);
      if (off != NULL)
            *off = TIFFSeekFile(tif,
                dircount*sizeof (TIFFDirEntry), SEEK_CUR);
      else
            (void) TIFFSeekFile(tif,
                dircount*sizeof (TIFFDirEntry), SEEK_CUR);
      if (!ReadOK(tif, nextdir, sizeof (uint32))) {
            TIFFError(module, "%s: Error fetching directory link",
                tif->tif_name);
            return (0);
      }
      if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabLong(nextdir);
      return (1);
}

/*
 * Count the number of directories in a file.
 */
tdir_t
TIFFNumberOfDirectories(TIFF* tif)
{
      uint32 nextdir = tif->tif_header.tiff_diroff;
      tdir_t n = 0;

      while (nextdir != 0 && TIFFAdvanceDirectory(tif, &nextdir, NULL))
            n++;
      return (n);
}

/*
 * Set the n-th directory as the current directory.
 * NB: Directories are numbered starting at 0.
 */
int
TIFFSetDirectory(TIFF* tif, tdir_t dirn)
{
      uint32 nextdir;
      tdir_t n;

      nextdir = tif->tif_header.tiff_diroff;
      for (n = dirn; n > 0 && nextdir != 0; n--)
            if (!TIFFAdvanceDirectory(tif, &nextdir, NULL))
                  return (0);
      tif->tif_nextdiroff = nextdir;
      /*
       * Set curdir to the actual directory index.  The
       * -1 is because TIFFReadDirectory will increment
       * tif_curdir after successfully reading the directory.
       */
      tif->tif_curdir = (dirn - n) - 1;
      return (TIFFReadDirectory(tif));
}

/*
 * Set the current directory to be the directory
 * located at the specified file offset.  This interface
 * is used mainly to access directories linked with
 * the SubIFD tag (e.g. thumbnail images).
 */
int
TIFFSetSubDirectory(TIFF* tif, uint32 diroff)
{
      tif->tif_nextdiroff = diroff;
      return (TIFFReadDirectory(tif));
}

/*
 * Return file offset of the current directory.
 */
uint32
TIFFCurrentDirOffset(TIFF* tif)
{
      return (tif->tif_diroff);
}

/*
 * Return an indication of whether or not we are
 * at the last directory in the file.
 */
int
TIFFLastDirectory(TIFF* tif)
{
      return (tif->tif_nextdiroff == 0);
}

/*
 * Unlink the specified directory from the directory chain.
 */
int
TIFFUnlinkDirectory(TIFF* tif, tdir_t dirn)
{
      static const char module[] = "TIFFUnlinkDirectory";
      uint32 nextdir;
      toff_t off;
      tdir_t n;

      if (tif->tif_mode == O_RDONLY) {
            TIFFError(module, "Can not unlink directory in read-only file");
            return (0);
      }
      /*
       * Go to the directory before the one we want
       * to unlink and nab the offset of the link
       * field we'll need to patch.
       */
      nextdir = tif->tif_header.tiff_diroff;
      off = sizeof (uint16) + sizeof (uint16);
      for (n = dirn-1; n > 0; n--) {
            if (nextdir == 0) {
                  TIFFError(module, "Directory %d does not exist", dirn);
                  return (0);
            }
            if (!TIFFAdvanceDirectory(tif, &nextdir, &off))
                  return (0);
      }
      /*
       * Advance to the directory to be unlinked and fetch
       * the offset of the directory that follows.
       */
      if (!TIFFAdvanceDirectory(tif, &nextdir, NULL))
            return (0);
      /*
       * Go back and patch the link field of the preceding
       * directory to point to the offset of the directory
       * that follows.
       */
      (void) TIFFSeekFile(tif, off, SEEK_SET);
      if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabLong(&nextdir);
      if (!WriteOK(tif, &nextdir, sizeof (uint32))) {
            TIFFError(module, "Error writing directory link");
            return (0);
      }
      /*
       * Leave directory state setup safely.  We don't have
       * facilities for doing inserting and removing directories,
       * so it's safest to just invalidate everything.  This
       * means that the caller can only append to the directory
       * chain.
       */
      (*tif->tif_cleanup)(tif);
      if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
            _TIFFfree(tif->tif_rawdata);
            tif->tif_rawdata = NULL;
            tif->tif_rawcc = 0;
      }
      tif->tif_flags &= ~(TIFF_BEENWRITING|TIFF_BUFFERSETUP|TIFF_POSTENCODE);
      TIFFFreeDirectory(tif);
      TIFFDefaultDirectory(tif);
      tif->tif_diroff = 0;                /* force link on next write */
      tif->tif_nextdiroff = 0;            /* next write must be at end */
      tif->tif_curoff = 0;
      tif->tif_row = (uint32) -1;
      tif->tif_curstrip = (tstrip_t) -1;
      return (1);
}

/*                [BFC]
 *
 * Author: Bruce Cameron <cameron@petris.com>
 *
 * Set a table of tags that are to be replaced during directory process by the
 * 'IGNORE' state - or return TRUE/FALSE for the requested tag such that
 * 'ReadDirectory' can use the stored information.
 */
int
TIFFReassignTagToIgnore (enum TIFFIgnoreSense task, int TIFFtagID)
{
    static int TIFFignoretags [FIELD_LAST];
    static int tagcount = 0 ;
    int           i;                            /* Loop index */
    int           j;                            /* Loop index */

    switch (task)
    {
      case TIS_STORE:
        if ( tagcount < (FIELD_LAST - 1) )
        {
            for ( j = 0 ; j < tagcount ; ++j )
            {                             /* Do not add duplicate tag */
                if ( TIFFignoretags [j] == TIFFtagID )
                    return (TRUE) ;
            }
            TIFFignoretags [tagcount++] = TIFFtagID ;
            return (TRUE) ;
        }
        break ;
        
      case TIS_EXTRACT:
        for ( i = 0 ; i < tagcount ; ++i )
        {
            if ( TIFFignoretags [i] == TIFFtagID )
                return (TRUE) ;
        }
        break;
        
      case TIS_EMPTY:
        tagcount = 0 ;              /* Clear the list */
        return (TRUE) ;
        break;
        
      default:
        break;
    }
    
    return (FALSE);
}

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