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tif_dirwrite.c

/* $Id: tif_dirwrite.c,v 1.34 2006/02/23 16:07:45 dron 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 Write Support Routines.
 */
#include "tiffiop.h"

#ifdef HAVE_IEEEFP
# define    TIFFCvtNativeToIEEEFloat(tif, n, fp)
# define    TIFFCvtNativeToIEEEDouble(tif, n, dp)
#else
extern      void TIFFCvtNativeToIEEEFloat(TIFF*, uint32, float*);
extern      void TIFFCvtNativeToIEEEDouble(TIFF*, uint32, double*);
#endif

static      int TIFFWriteNormalTag(TIFF*, TIFFDirEntry*, const TIFFFieldInfo*);
static      void TIFFSetupShortLong(TIFF*, ttag_t, TIFFDirEntry*, uint32);
static      void TIFFSetupShort(TIFF*, ttag_t, TIFFDirEntry*, uint16);
static      int TIFFSetupShortPair(TIFF*, ttag_t, TIFFDirEntry*);
static      int TIFFWritePerSampleShorts(TIFF*, ttag_t, TIFFDirEntry*);
static      int TIFFWritePerSampleAnys(TIFF*, TIFFDataType, ttag_t, TIFFDirEntry*);
static      int TIFFWriteShortTable(TIFF*, ttag_t, TIFFDirEntry*, uint32, uint16**);
static      int TIFFWriteShortArray(TIFF*, TIFFDirEntry*, uint16*);
static      int TIFFWriteLongArray(TIFF *, TIFFDirEntry*, uint32*);
static      int TIFFWriteRationalArray(TIFF *, TIFFDirEntry*, float*);
static      int TIFFWriteFloatArray(TIFF *, TIFFDirEntry*, float*);
static      int TIFFWriteDoubleArray(TIFF *, TIFFDirEntry*, double*);
static      int TIFFWriteByteArray(TIFF*, TIFFDirEntry*, char*);
static      int TIFFWriteAnyArray(TIFF*,
          TIFFDataType, ttag_t, TIFFDirEntry*, uint32, double*);
static      int TIFFWriteTransferFunction(TIFF*, TIFFDirEntry*);
static      int TIFFWriteInkNames(TIFF*, TIFFDirEntry*);
static      int TIFFWriteData(TIFF*, TIFFDirEntry*, char*);
static      int TIFFLinkDirectory(TIFF*);

#define     WriteRationalPair(type, tag1, v1, tag2, v2) {         \
      TIFFWriteRational((tif), (type), (tag1), (dir), (v1)) \
      TIFFWriteRational((tif), (type), (tag2), (dir)+1, (v2))     \
      (dir)++;                                  \
}
#define     TIFFWriteRational(tif, type, tag, dir, v)       \
      (dir)->tdir_tag = (tag);                        \
      (dir)->tdir_type = (type);                      \
      (dir)->tdir_count = 1;                          \
      if (!TIFFWriteRationalArray((tif), (dir), &(v)))      \
            goto bad;

/*
 * Write the contents of the current directory
 * to the specified file.  This routine doesn't
 * handle overwriting a directory with auxiliary
 * storage that's been changed.
 */
static int
_TIFFWriteDirectory(TIFF* tif, int done)
{
      uint16 dircount;
      toff_t diroff;
      ttag_t tag;
      uint32 nfields;
      tsize_t dirsize;
      char* data;
      TIFFDirEntry* dir;
      TIFFDirectory* td;
      unsigned long b, fields[FIELD_SETLONGS];
      int fi, nfi;

      if (tif->tif_mode == O_RDONLY)
            return (1);
      /*
       * Clear write state so that subsequent images with
       * different characteristics get the right buffers
       * setup for them.
       */
      if (done)
      {
          if (tif->tif_flags & TIFF_POSTENCODE) {
                tif->tif_flags &= ~TIFF_POSTENCODE;
                if (!(*tif->tif_postencode)(tif)) {
                        TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                        "Error post-encoding before directory write");
                      return (0);
                }
          }
          (*tif->tif_close)(tif);         /* shutdown encoder */
          /*
           * Flush any data that might have been written
           * by the compression close+cleanup routines.
           */
          if (tif->tif_rawcc > 0 && !TIFFFlushData1(tif)) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                  "Error flushing data before directory write");
                return (0);
          }
          if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
                _TIFFfree(tif->tif_rawdata);
                tif->tif_rawdata = NULL;
                tif->tif_rawcc = 0;
                tif->tif_rawdatasize = 0;
          }
          tif->tif_flags &= ~(TIFF_BEENWRITING|TIFF_BUFFERSETUP);
      }

      td = &tif->tif_dir;
      /*
       * Size the directory so that we can calculate
       * offsets for the data items that aren't kept
       * in-place in each field.
       */
      nfields = 0;
      for (b = 0; b <= FIELD_LAST; b++)
            if (TIFFFieldSet(tif, b) && b != FIELD_CUSTOM)
                  nfields += (b < FIELD_SUBFILETYPE ? 2 : 1);
        nfields += td->td_customValueCount;
      dirsize = nfields * sizeof (TIFFDirEntry);
      data = (char*) _TIFFmalloc(dirsize);
      if (data == NULL) {
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                "Cannot write directory, out of space");
            return (0);
      }
      /*
       * Directory hasn't been placed yet, put
       * it at the end of the file and link it
       * into the existing directory structure.
       */
      if (tif->tif_diroff == 0 && !TIFFLinkDirectory(tif))
            goto bad;
      tif->tif_dataoff = (toff_t)(
          tif->tif_diroff + sizeof (uint16) + dirsize + sizeof (toff_t));
      if (tif->tif_dataoff & 1)
            tif->tif_dataoff++;
      (void) TIFFSeekFile(tif, tif->tif_dataoff, SEEK_SET);
      tif->tif_curdir++;
      dir = (TIFFDirEntry*) data;
      /*
       * Setup external form of directory
       * entries and write data items.
       */
      _TIFFmemcpy(fields, td->td_fieldsset, sizeof (fields));
      /*
       * Write out ExtraSamples tag only if
       * extra samples are present in the data.
       */
      if (FieldSet(fields, FIELD_EXTRASAMPLES) && !td->td_extrasamples) {
            ResetFieldBit(fields, FIELD_EXTRASAMPLES);
            nfields--;
            dirsize -= sizeof (TIFFDirEntry);
      }                                               /*XXX*/
      for (fi = 0, nfi = tif->tif_nfields; nfi > 0; nfi--, fi++) {
            const TIFFFieldInfo* fip = tif->tif_fieldinfo[fi];

                /*
                ** For custom fields, we test to see if the custom field
                ** is set or not.  For normal fields, we just use the
                ** FieldSet test. 
                */
                if( fip->field_bit == FIELD_CUSTOM )
                {
                    int ci, is_set = FALSE;

                    for( ci = 0; ci < td->td_customValueCount; ci++ )
                        is_set |= (td->td_customValues[ci].info == fip);

                    if( !is_set )
                        continue;
                }
            else if (!FieldSet(fields, fip->field_bit))
                    continue;


                /*
                ** Handle other fields.
                */
            switch (fip->field_bit)
                {
            case FIELD_STRIPOFFSETS:
                  /*
                   * We use one field bit for both strip and tile

                   * offsets, and so must be careful in selecting
                   * the appropriate field descriptor (so that tags
                   * are written in sorted order).
                   */
                  tag = isTiled(tif) ?
                      TIFFTAG_TILEOFFSETS : TIFFTAG_STRIPOFFSETS;
                  if (tag != fip->field_tag)
                        continue;
                  
                  dir->tdir_tag = (uint16) tag;
                  dir->tdir_type = (uint16) TIFF_LONG;
                  dir->tdir_count = (uint32) td->td_nstrips;
                  if (!TIFFWriteLongArray(tif, dir, td->td_stripoffset))
                        goto bad;
                  break;
            case FIELD_STRIPBYTECOUNTS:
                  /*
                   * We use one field bit for both strip and tile
                   * byte counts, and so must be careful in selecting
                   * the appropriate field descriptor (so that tags
                   * are written in sorted order).
                   */
                  tag = isTiled(tif) ?
                      TIFFTAG_TILEBYTECOUNTS : TIFFTAG_STRIPBYTECOUNTS;
                  if (tag != fip->field_tag)
                        continue;
                  
                  dir->tdir_tag = (uint16) tag;
                  dir->tdir_type = (uint16) TIFF_LONG;
                  dir->tdir_count = (uint32) td->td_nstrips;
                  if (!TIFFWriteLongArray(tif, dir,
                                    td->td_stripbytecount))
                        goto bad;
                  break;
            case FIELD_ROWSPERSTRIP:
                  TIFFSetupShortLong(tif, TIFFTAG_ROWSPERSTRIP,
                      dir, td->td_rowsperstrip);
                  break;
            case FIELD_COLORMAP:
                  if (!TIFFWriteShortTable(tif, TIFFTAG_COLORMAP, dir,
                      3, td->td_colormap))
                        goto bad;
                  break;
            case FIELD_IMAGEDIMENSIONS:
                  TIFFSetupShortLong(tif, TIFFTAG_IMAGEWIDTH,
                      dir++, td->td_imagewidth);
                  TIFFSetupShortLong(tif, TIFFTAG_IMAGELENGTH,
                      dir, td->td_imagelength);
                  break;
            case FIELD_TILEDIMENSIONS:
                  TIFFSetupShortLong(tif, TIFFTAG_TILEWIDTH,
                      dir++, td->td_tilewidth);
                  TIFFSetupShortLong(tif, TIFFTAG_TILELENGTH,
                      dir, td->td_tilelength);
                  break;
            case FIELD_COMPRESSION:
                  TIFFSetupShort(tif, TIFFTAG_COMPRESSION,
                      dir, td->td_compression);
                  break;
            case FIELD_PHOTOMETRIC:
                  TIFFSetupShort(tif, TIFFTAG_PHOTOMETRIC,
                      dir, td->td_photometric);
                  break;
            case FIELD_POSITION:
                  WriteRationalPair(TIFF_RATIONAL,
                      TIFFTAG_XPOSITION, td->td_xposition,
                      TIFFTAG_YPOSITION, td->td_yposition);
                  break;
            case FIELD_RESOLUTION:
                  WriteRationalPair(TIFF_RATIONAL,
                      TIFFTAG_XRESOLUTION, td->td_xresolution,
                      TIFFTAG_YRESOLUTION, td->td_yresolution);
                  break;
            case FIELD_BITSPERSAMPLE:
            case FIELD_MINSAMPLEVALUE:
            case FIELD_MAXSAMPLEVALUE:
            case FIELD_SAMPLEFORMAT:
                  if (!TIFFWritePerSampleShorts(tif, fip->field_tag, dir))
                        goto bad;
                  break;
            case FIELD_SMINSAMPLEVALUE:
            case FIELD_SMAXSAMPLEVALUE:
                  if (!TIFFWritePerSampleAnys(tif,
                      _TIFFSampleToTagType(tif), fip->field_tag, dir))
                        goto bad;
                  break;
            case FIELD_PAGENUMBER:
            case FIELD_HALFTONEHINTS:
            case FIELD_YCBCRSUBSAMPLING:
                  if (!TIFFSetupShortPair(tif, fip->field_tag, dir))
                        goto bad;
                  break;
            case FIELD_INKNAMES:
                  if (!TIFFWriteInkNames(tif, dir))
                        goto bad;
                  break;
            case FIELD_TRANSFERFUNCTION:
                  if (!TIFFWriteTransferFunction(tif, dir))
                        goto bad;
                  break;
            case FIELD_SUBIFD:
                  /*
                   * XXX: Always write this field using LONG type
                   * for backward compatibility.
                   */
                  dir->tdir_tag = (uint16) fip->field_tag;
                  dir->tdir_type = (uint16) TIFF_LONG;
                  dir->tdir_count = (uint32) td->td_nsubifd;
                  if (!TIFFWriteLongArray(tif, dir, td->td_subifd))
                        goto bad;
                  /*
                   * Total hack: if this directory includes a SubIFD
                   * tag then force the next <n> directories to be
                   * written as ``sub directories'' of this one.  This
                   * is used to write things like thumbnails and
                   * image masks that one wants to keep out of the
                   * normal directory linkage access mechanism.
                   */
                  if (dir->tdir_count > 0) {
                        tif->tif_flags |= TIFF_INSUBIFD;
                        tif->tif_nsubifd = (uint16) dir->tdir_count;
                        if (dir->tdir_count > 1)
                              tif->tif_subifdoff = dir->tdir_offset;
                        else
                              tif->tif_subifdoff = (uint32)(
                                    tif->tif_diroff
                                  + sizeof (uint16)
                                  + ((char*)&dir->tdir_offset-data));
                  }
                  break;
            default:
                  /* XXX: Should be fixed and removed. */
                  if (fip->field_tag == TIFFTAG_DOTRANGE) {
                        if (!TIFFSetupShortPair(tif, fip->field_tag, dir))
                              goto bad;
                  }
                  else if (!TIFFWriteNormalTag(tif, dir, fip))
                        goto bad;
                  break;
            }
            dir++;
                
                if( fip->field_bit != FIELD_CUSTOM )
                    ResetFieldBit(fields, fip->field_bit);
      }

      /*
       * Write directory.
       */
      dircount = (uint16) nfields;
      diroff = (uint32) tif->tif_nextdiroff;
      if (tif->tif_flags & TIFF_SWAB) {
            /*
             * The file's byte order is opposite to the
             * native machine architecture.  We overwrite
             * the directory information with impunity
             * because it'll be released below after we
             * write it to the file.  Note that all the
             * other tag construction routines assume that
             * we do this byte-swapping; i.e. they only
             * byte-swap indirect data.
             */
            for (dir = (TIFFDirEntry*) data; dircount; dir++, dircount--) {
                  TIFFSwabArrayOfShort(&dir->tdir_tag, 2);
                  TIFFSwabArrayOfLong(&dir->tdir_count, 2);
            }
            dircount = (uint16) nfields;
            TIFFSwabShort(&dircount);
            TIFFSwabLong(&diroff);
      }
      (void) TIFFSeekFile(tif, tif->tif_diroff, SEEK_SET);
      if (!WriteOK(tif, &dircount, sizeof (dircount))) {
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing directory count");
            goto bad;
      }
      if (!WriteOK(tif, data, dirsize)) {
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing directory contents");
            goto bad;
      }
      if (!WriteOK(tif, &diroff, sizeof (diroff))) {
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing directory link");
            goto bad;
      }
      if (done) {
            TIFFFreeDirectory(tif);
            tif->tif_flags &= ~TIFF_DIRTYDIRECT;
            (*tif->tif_cleanup)(tif);

            /*
            * Reset directory-related state for subsequent
            * directories.
            */
            TIFFCreateDirectory(tif);
      }
      _TIFFfree(data);
      return (1);
bad:
      _TIFFfree(data);
      return (0);
}
#undef WriteRationalPair

int
TIFFWriteDirectory(TIFF* tif)
{
      return _TIFFWriteDirectory(tif, TRUE);
}

/*
 * Similar to TIFFWriteDirectory(), writes the directory out
 * but leaves all data structures in memory so that it can be
 * written again.  This will make a partially written TIFF file
 * readable before it is successfully completed/closed.
 */ 
int
TIFFCheckpointDirectory(TIFF* tif)
{
      int rc;
      /* Setup the strips arrays, if they haven't already been. */
      if (tif->tif_dir.td_stripoffset == NULL)
          (void) TIFFSetupStrips(tif);
      rc = _TIFFWriteDirectory(tif, FALSE);
      (void) TIFFSetWriteOffset(tif, TIFFSeekFile(tif, 0, SEEK_END));
      return rc;
}

/*
 * Process tags that are not special cased.
 */
static int
TIFFWriteNormalTag(TIFF* tif, TIFFDirEntry* dir, const TIFFFieldInfo* fip)
{
      uint16 wc = (uint16) fip->field_writecount;
      uint32 wc2;

      dir->tdir_tag = (uint16) fip->field_tag;
      dir->tdir_type = (uint16) fip->field_type;
      dir->tdir_count = wc;
      
      switch (fip->field_type) {
      case TIFF_SHORT:
      case TIFF_SSHORT:
            if (fip->field_passcount) {
                  uint16* wp;
                  if (wc == (uint16) TIFF_VARIABLE2) {
                        TIFFGetField(tif, fip->field_tag, &wc2, &wp);
                        dir->tdir_count = wc2;
                  } else {    /* Assume TIFF_VARIABLE */
                        TIFFGetField(tif, fip->field_tag, &wc, &wp);
                        dir->tdir_count = wc;
                  }
                  if (!TIFFWriteShortArray(tif, dir, wp))
                        return 0;
            } else {
                  if (wc == 1) {
                        uint16 sv;
                        TIFFGetField(tif, fip->field_tag, &sv);
                        dir->tdir_offset =
                              TIFFInsertData(tif, dir->tdir_type, sv);
                  } else {
                        uint16* wp;
                        TIFFGetField(tif, fip->field_tag, &wp);
                        if (!TIFFWriteShortArray(tif, dir, wp))
                              return 0;
                  }
            }
            break;
      case TIFF_LONG:
      case TIFF_SLONG:
      case TIFF_IFD:
            if (fip->field_passcount) {
                  uint32* lp;
                  if (wc == (uint16) TIFF_VARIABLE2) {
                        TIFFGetField(tif, fip->field_tag, &wc2, &lp);
                        dir->tdir_count = wc2;
                  } else {    /* Assume TIFF_VARIABLE */
                        TIFFGetField(tif, fip->field_tag, &wc, &lp);
                        dir->tdir_count = wc;
                  }
                  if (!TIFFWriteLongArray(tif, dir, lp))
                        return 0;
            } else {
                  if (wc == 1) {
                        /* XXX handle LONG->SHORT conversion */
                        TIFFGetField(tif, fip->field_tag,
                                   &dir->tdir_offset);
                  } else {
                        uint32* lp;
                        TIFFGetField(tif, fip->field_tag, &lp);
                        if (!TIFFWriteLongArray(tif, dir, lp))
                              return 0;
                  }
            }
            break;
      case TIFF_RATIONAL:
      case TIFF_SRATIONAL:
            if (fip->field_passcount) {
                  float* fp;
                  if (wc == (uint16) TIFF_VARIABLE2) {
                        TIFFGetField(tif, fip->field_tag, &wc2, &fp);
                        dir->tdir_count = wc2;
                  } else {    /* Assume TIFF_VARIABLE */
                        TIFFGetField(tif, fip->field_tag, &wc, &fp);
                        dir->tdir_count = wc;
                  }
                  if (!TIFFWriteRationalArray(tif, dir, fp))
                        return 0;
            } else {
                  if (wc == 1) {
                        float fv;
                        TIFFGetField(tif, fip->field_tag, &fv);
                        if (!TIFFWriteRationalArray(tif, dir, &fv))
                              return 0;
                  } else {
                        float* fp;
                        TIFFGetField(tif, fip->field_tag, &fp);
                        if (!TIFFWriteRationalArray(tif, dir, fp))
                              return 0;
                  }
            }
            break;
      case TIFF_FLOAT:
            if (fip->field_passcount) {
                  float* fp;
                  if (wc == (uint16) TIFF_VARIABLE2) {
                        TIFFGetField(tif, fip->field_tag, &wc2, &fp);
                        dir->tdir_count = wc2;
                  } else {    /* Assume TIFF_VARIABLE */
                        TIFFGetField(tif, fip->field_tag, &wc, &fp);
                        dir->tdir_count = wc;
                  }
                  if (!TIFFWriteFloatArray(tif, dir, fp))
                        return 0;
            } else {
                  if (wc == 1) {
                        float fv;
                        TIFFGetField(tif, fip->field_tag, &fv);
                        if (!TIFFWriteFloatArray(tif, dir, &fv))
                              return 0;
                  } else {
                        float* fp;
                        TIFFGetField(tif, fip->field_tag, &fp);
                        if (!TIFFWriteFloatArray(tif, dir, fp))
                              return 0;
                  }
            }
            break;
      case TIFF_DOUBLE:
            if (fip->field_passcount) {
                  double* dp;
                  if (wc == (uint16) TIFF_VARIABLE2) {
                        TIFFGetField(tif, fip->field_tag, &wc2, &dp);
                        dir->tdir_count = wc2;
                  } else {    /* Assume TIFF_VARIABLE */
                        TIFFGetField(tif, fip->field_tag, &wc, &dp);
                        dir->tdir_count = wc;
                  }
                  if (!TIFFWriteDoubleArray(tif, dir, dp))
                        return 0;
            } else {
                  if (wc == 1) {
                        double dv;
                        TIFFGetField(tif, fip->field_tag, &dv);
                        if (!TIFFWriteDoubleArray(tif, dir, &dv))
                              return 0;
                  } else {
                        double* dp;
                        TIFFGetField(tif, fip->field_tag, &dp);
                        if (!TIFFWriteDoubleArray(tif, dir, dp))
                              return 0;
                  }
            }
            break;
      case TIFF_ASCII:
            { 
                    char* cp;
                    if (fip->field_passcount)
                        TIFFGetField(tif, fip->field_tag, &wc, &cp);
                    else
                        TIFFGetField(tif, fip->field_tag, &cp);

                    dir->tdir_count = (uint32) (strlen(cp) + 1);
                    if (!TIFFWriteByteArray(tif, dir, cp))
                        return (0);
            }
            break;

        case TIFF_BYTE:
        case TIFF_SBYTE:          
            if (fip->field_passcount) {
                  char* cp;
                  if (wc == (uint16) TIFF_VARIABLE2) {
                        TIFFGetField(tif, fip->field_tag, &wc2, &cp);
                        dir->tdir_count = wc2;
                  } else {    /* Assume TIFF_VARIABLE */
                        TIFFGetField(tif, fip->field_tag, &wc, &cp);
                        dir->tdir_count = wc;
                  }
                  if (!TIFFWriteByteArray(tif, dir, cp))
                        return 0;
            } else {
                  if (wc == 1) {
                        char cv;
                        TIFFGetField(tif, fip->field_tag, &cv);
                        if (!TIFFWriteByteArray(tif, dir, &cv))
                              return 0;
                  } else {
                        char* cp;
                        TIFFGetField(tif, fip->field_tag, &cp);
                        if (!TIFFWriteByteArray(tif, dir, cp))
                              return 0;
                  }
            }
                break;

      case TIFF_UNDEFINED:
            { char* cp;
              if (wc == (unsigned short) TIFF_VARIABLE) {
                  TIFFGetField(tif, fip->field_tag, &wc, &cp);
                  dir->tdir_count = wc;
              } else if (wc == (unsigned short) TIFF_VARIABLE2) {
                  TIFFGetField(tif, fip->field_tag, &wc2, &cp);
                  dir->tdir_count = wc2;
              } else 
                  TIFFGetField(tif, fip->field_tag, &cp);
              if (!TIFFWriteByteArray(tif, dir, cp))
                  return (0);
            }
            break;

        case TIFF_NOTYPE:
                break;
      }
      return (1);
}

/*
 * Setup a directory entry with either a SHORT
 * or LONG type according to the value.
 */
static void
TIFFSetupShortLong(TIFF* tif, ttag_t tag, TIFFDirEntry* dir, uint32 v)
{
      dir->tdir_tag = (uint16) tag;
      dir->tdir_count = 1;
      if (v > 0xffffL) {
            dir->tdir_type = (short) TIFF_LONG;
            dir->tdir_offset = v;
      } else {
            dir->tdir_type = (short) TIFF_SHORT;
            dir->tdir_offset = TIFFInsertData(tif, (int) TIFF_SHORT, v);
      }
}

/*
 * Setup a SHORT directory entry
 */
static void
TIFFSetupShort(TIFF* tif, ttag_t tag, TIFFDirEntry* dir, uint16 v)
{
      dir->tdir_tag = (uint16) tag;
      dir->tdir_count = 1;
      dir->tdir_type = (short) TIFF_SHORT;
      dir->tdir_offset = TIFFInsertData(tif, (int) TIFF_SHORT, v);
}
#undef MakeShortDirent

#define     NITEMS(x)   (sizeof (x) / sizeof (x[0]))
/*
 * Setup a directory entry that references a
 * samples/pixel array of SHORT values and
 * (potentially) write the associated indirect
 * values.
 */
static int
TIFFWritePerSampleShorts(TIFF* tif, ttag_t tag, TIFFDirEntry* dir)
{
      uint16 buf[10], v;
      uint16* w = buf;
      uint16 i, samples = tif->tif_dir.td_samplesperpixel;
      int status;

      if (samples > NITEMS(buf)) {
            w = (uint16*) _TIFFmalloc(samples * sizeof (uint16));
            if (w == NULL) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                      "No space to write per-sample shorts");
                  return (0);
            }
      }
      TIFFGetField(tif, tag, &v);
      for (i = 0; i < samples; i++)
            w[i] = v;
      
      dir->tdir_tag = (uint16) tag;
      dir->tdir_type = (uint16) TIFF_SHORT;
      dir->tdir_count = samples;
      status = TIFFWriteShortArray(tif, dir, w);
      if (w != buf)
            _TIFFfree((char*) w);
      return (status);
}

/*
 * Setup a directory entry that references a samples/pixel array of ``type''
 * values and (potentially) write the associated indirect values.  The source
 * data from TIFFGetField() for the specified tag must be returned as double.
 */
static int
TIFFWritePerSampleAnys(TIFF* tif,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir)
{
      double buf[10], v;
      double* w = buf;
      uint16 i, samples = tif->tif_dir.td_samplesperpixel;
      int status;

      if (samples > NITEMS(buf)) {
            w = (double*) _TIFFmalloc(samples * sizeof (double));
            if (w == NULL) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                      "No space to write per-sample values");
                  return (0);
            }
      }
      TIFFGetField(tif, tag, &v);
      for (i = 0; i < samples; i++)
            w[i] = v;
      status = TIFFWriteAnyArray(tif, type, tag, dir, samples, w);
      if (w != buf)
            _TIFFfree(w);
      return (status);
}
#undef NITEMS

/*
 * Setup a pair of shorts that are returned by
 * value, rather than as a reference to an array.
 */
static int
TIFFSetupShortPair(TIFF* tif, ttag_t tag, TIFFDirEntry* dir)
{
      uint16 v[2];

      TIFFGetField(tif, tag, &v[0], &v[1]);

      dir->tdir_tag = (uint16) tag;
      dir->tdir_type = (uint16) TIFF_SHORT;
      dir->tdir_count = 2;
      return (TIFFWriteShortArray(tif, dir, v));
}

/*
 * Setup a directory entry for an NxM table of shorts,
 * where M is known to be 2**bitspersample, and write
 * the associated indirect data.
 */
static int
TIFFWriteShortTable(TIFF* tif,
    ttag_t tag, TIFFDirEntry* dir, uint32 n, uint16** table)
{
      uint32 i, off;

      dir->tdir_tag = (uint16) tag;
      dir->tdir_type = (short) TIFF_SHORT;
      /* XXX -- yech, fool TIFFWriteData */
      dir->tdir_count = (uint32) (1L<<tif->tif_dir.td_bitspersample);
      off = tif->tif_dataoff;
      for (i = 0; i < n; i++)
            if (!TIFFWriteData(tif, dir, (char *)table[i]))
                  return (0);
      dir->tdir_count *= n;
      dir->tdir_offset = off;
      return (1);
}

/*
 * Write/copy data associated with an ASCII or opaque tag value.
 */
static int
TIFFWriteByteArray(TIFF* tif, TIFFDirEntry* dir, char* cp)
{
      if (dir->tdir_count > 4) {
            if (!TIFFWriteData(tif, dir, cp))
                  return (0);
      } else
            _TIFFmemcpy(&dir->tdir_offset, cp, dir->tdir_count);
      return (1);
}

/*
 * Setup a directory entry of an array of SHORT
 * or SSHORT and write the associated indirect values.
 */
static int
TIFFWriteShortArray(TIFF* tif, TIFFDirEntry* dir, uint16* v)
{
      if (dir->tdir_count <= 2) {
            if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
                  dir->tdir_offset = (uint32) ((long) v[0] << 16);
                  if (dir->tdir_count == 2)
                        dir->tdir_offset |= v[1] & 0xffff;
            } else {
                  dir->tdir_offset = v[0] & 0xffff;
                  if (dir->tdir_count == 2)
                        dir->tdir_offset |= (long) v[1] << 16;
            }
            return (1);
      } else
            return (TIFFWriteData(tif, dir, (char*) v));
}

/*
 * Setup a directory entry of an array of LONG
 * or SLONG and write the associated indirect values.
 */
static int
TIFFWriteLongArray(TIFF* tif, TIFFDirEntry* dir, uint32* v)
{
      if (dir->tdir_count == 1) {
            dir->tdir_offset = v[0];
            return (1);
      } else
            return (TIFFWriteData(tif, dir, (char*) v));
}

/*
 * Setup a directory entry of an array of RATIONAL
 * or SRATIONAL and write the associated indirect values.
 */
static int
TIFFWriteRationalArray(TIFF* tif, TIFFDirEntry* dir, float* v)
{
      uint32 i;
      uint32* t;
      int status;

      t = (uint32*) _TIFFmalloc(2 * dir->tdir_count * sizeof (uint32));
      if (t == NULL) {
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                "No space to write RATIONAL array");
            return (0);
      }
      for (i = 0; i < dir->tdir_count; i++) {
            float fv = v[i];
            int sign = 1;
            uint32 den;

            if (fv < 0) {
                  if (dir->tdir_type == TIFF_RATIONAL) {
                        TIFFWarningExt(tif->tif_clientdata, tif->tif_name,
      "\"%s\": Information lost writing value (%g) as (unsigned) RATIONAL",
                        _TIFFFieldWithTag(tif,dir->tdir_tag)->field_name,
                        fv);
                        fv = 0;
                  } else
                        fv = -fv, sign = -1;
            }
            den = 1L;
            if (fv > 0) {
                  while (fv < 1L<<(31-3) && den < 1L<<(31-3))
                        fv *= 1<<3, den *= 1L<<3;
            }
            t[2*i+0] = (uint32) (sign * (fv + 0.5));
            t[2*i+1] = den;
      }
      status = TIFFWriteData(tif, dir, (char *)t);
      _TIFFfree((char*) t);
      return (status);
}

static int
TIFFWriteFloatArray(TIFF* tif, TIFFDirEntry* dir, float* v)
{
      TIFFCvtNativeToIEEEFloat(tif, dir->tdir_count, v);
      if (dir->tdir_count == 1) {
            dir->tdir_offset = *(uint32*) &v[0];
            return (1);
      } else
            return (TIFFWriteData(tif, dir, (char*) v));
}

static int
TIFFWriteDoubleArray(TIFF* tif, TIFFDirEntry* dir, double* v)
{
      TIFFCvtNativeToIEEEDouble(tif, dir->tdir_count, v);
      return (TIFFWriteData(tif, dir, (char*) v));
}

/*
 * Write an array of ``type'' values for a specified tag (i.e. this is a tag
 * which is allowed to have different types, e.g. SMaxSampleType).
 * Internally the data values are represented as double since a double can
 * hold any of the TIFF tag types (yes, this should really be an abstract
 * type tany_t for portability).  The data is converted into the specified
 * type in a temporary buffer and then handed off to the appropriate array
 * writer.
 */
static int
TIFFWriteAnyArray(TIFF* tif,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir, uint32 n, double* v)
{
      char buf[10 * sizeof(double)];
      char* w = buf;
      int i, status = 0;

      if (n * TIFFDataWidth(type) > sizeof buf) {
            w = (char*) _TIFFmalloc(n * TIFFDataWidth(type));
            if (w == NULL) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                      "No space to write array");
                  return (0);
            }
      }

      dir->tdir_tag = (uint16) tag;
      dir->tdir_type = (uint16) type;
      dir->tdir_count = n;

      switch (type) {
      case TIFF_BYTE:
            { 
                  uint8* bp = (uint8*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (uint8) v[i];
                  if (!TIFFWriteByteArray(tif, dir, (char*) bp))
                        goto out;
            }
            break;
      case TIFF_SBYTE:
            { 
                  int8* bp = (int8*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (int8) v[i];
                  if (!TIFFWriteByteArray(tif, dir, (char*) bp))
                        goto out;
            }
            break;
      case TIFF_SHORT:
            {
                  uint16* bp = (uint16*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (uint16) v[i];
                  if (!TIFFWriteShortArray(tif, dir, (uint16*)bp))
                        goto out;
            }
            break;
      case TIFF_SSHORT:
            { 
                  int16* bp = (int16*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (int16) v[i];
                  if (!TIFFWriteShortArray(tif, dir, (uint16*)bp))
                        goto out;
            }
            break;
      case TIFF_LONG:
            {
                  uint32* bp = (uint32*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (uint32) v[i];
                  if (!TIFFWriteLongArray(tif, dir, bp))
                        goto out;
            }
            break;
      case TIFF_SLONG:
            {
                  int32* bp = (int32*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (int32) v[i];
                  if (!TIFFWriteLongArray(tif, dir, (uint32*) bp))
                        goto out;
            }
            break;
      case TIFF_FLOAT:
            { 
                  float* bp = (float*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (float) v[i];
                  if (!TIFFWriteFloatArray(tif, dir, bp))
                        goto out;
            }
            break;
      case TIFF_DOUBLE:
            return (TIFFWriteDoubleArray(tif, dir, v));
      default:
            /* TIFF_NOTYPE */
            /* TIFF_ASCII */
            /* TIFF_UNDEFINED */
            /* TIFF_RATIONAL */
            /* TIFF_SRATIONAL */
            goto out;
      }
      status = 1;
 out:
      if (w != buf)
            _TIFFfree(w);
      return (status);
}

static int
TIFFWriteTransferFunction(TIFF* tif, TIFFDirEntry* dir)
{
      TIFFDirectory* td = &tif->tif_dir;
      tsize_t n = (1L<<td->td_bitspersample) * sizeof (uint16);
      uint16** tf = td->td_transferfunction;
      int ncols;

      /*
       * Check if the table can be written as a single column,
       * or if it must be written as 3 columns.  Note that we
       * write a 3-column tag if there are 2 samples/pixel and
       * a single column of data won't suffice--hmm.
       */
      switch (td->td_samplesperpixel - td->td_extrasamples) {
      default:    if (_TIFFmemcmp(tf[0], tf[2], n)) { ncols = 3; break; }
      case 2:           if (_TIFFmemcmp(tf[0], tf[1], n)) { ncols = 3; break; }
      case 1: case 0:   ncols = 1;
      }
      return (TIFFWriteShortTable(tif,
          TIFFTAG_TRANSFERFUNCTION, dir, ncols, tf));
}

static int
TIFFWriteInkNames(TIFF* tif, TIFFDirEntry* dir)
{
      TIFFDirectory* td = &tif->tif_dir;

      dir->tdir_tag = TIFFTAG_INKNAMES;
      dir->tdir_type = (short) TIFF_ASCII;
      dir->tdir_count = td->td_inknameslen;
      return (TIFFWriteByteArray(tif, dir, td->td_inknames));
}

/*
 * Write a contiguous directory item.
 */
static int
TIFFWriteData(TIFF* tif, TIFFDirEntry* dir, char* cp)
{
      tsize_t cc;

      if (tif->tif_flags & TIFF_SWAB) {
            switch (dir->tdir_type) {
            case TIFF_SHORT:
            case TIFF_SSHORT:
                  TIFFSwabArrayOfShort((uint16*) cp, dir->tdir_count);
                  break;
            case TIFF_LONG:
            case TIFF_SLONG:
            case TIFF_FLOAT:
                  TIFFSwabArrayOfLong((uint32*) cp, dir->tdir_count);
                  break;
            case TIFF_RATIONAL:
            case TIFF_SRATIONAL:
                  TIFFSwabArrayOfLong((uint32*) cp, 2*dir->tdir_count);
                  break;
            case TIFF_DOUBLE:
                  TIFFSwabArrayOfDouble((double*) cp, dir->tdir_count);
                  break;
            }
      }
      dir->tdir_offset = tif->tif_dataoff;
      cc = dir->tdir_count * TIFFDataWidth((TIFFDataType) dir->tdir_type);
      if (SeekOK(tif, dir->tdir_offset) &&
          WriteOK(tif, cp, cc)) {
            tif->tif_dataoff += (cc + 1) & ~1;
            return (1);
      }
      TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing data for field \"%s\"",
          _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
      return (0);
}

/*
 * Similar to TIFFWriteDirectory(), but if the directory has already
 * been written once, it is relocated to the end of the file, in case it
 * has changed in size.  Note that this will result in the loss of the 
 * previously used directory space. 
 */ 

int 
TIFFRewriteDirectory( TIFF *tif )
{
    static const char module[] = "TIFFRewriteDirectory";

    /* We don't need to do anything special if it hasn't been written. */
    if( tif->tif_diroff == 0 )
        return TIFFWriteDirectory( tif );

    /*
    ** Find and zero the pointer to this directory, so that TIFFLinkDirectory
    ** will cause it to be added after this directories current pre-link.
    */
    
    /* Is it the first directory in the file? */
    if (tif->tif_header.tiff_diroff == tif->tif_diroff) 
    {
        tif->tif_header.tiff_diroff = 0;
        tif->tif_diroff = 0;

        TIFFSeekFile(tif, (toff_t)(TIFF_MAGIC_SIZE+TIFF_VERSION_SIZE),
                 SEEK_SET);
        if (!WriteOK(tif, &(tif->tif_header.tiff_diroff), 
                     sizeof (tif->tif_diroff))) 
        {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error updating TIFF header");
            return (0);
        }
    }
    else
    {
        toff_t  nextdir, off;

      nextdir = tif->tif_header.tiff_diroff;
      do {
            uint16 dircount;

            if (!SeekOK(tif, nextdir) ||
                !ReadOK(tif, &dircount, sizeof (dircount))) {
                  TIFFErrorExt(tif->tif_clientdata, module, "Error fetching directory count");
                  return (0);
            }
            if (tif->tif_flags & TIFF_SWAB)
                  TIFFSwabShort(&dircount);
            (void) TIFFSeekFile(tif,
                dircount * sizeof (TIFFDirEntry), SEEK_CUR);
            if (!ReadOK(tif, &nextdir, sizeof (nextdir))) {
                  TIFFErrorExt(tif->tif_clientdata, module, "Error fetching directory link");
                  return (0);
            }
            if (tif->tif_flags & TIFF_SWAB)
                  TIFFSwabLong(&nextdir);
      } while (nextdir != tif->tif_diroff && nextdir != 0);
        off = TIFFSeekFile(tif, 0, SEEK_CUR); /* get current offset */
        (void) TIFFSeekFile(tif, off - (toff_t)sizeof(nextdir), SEEK_SET);
        tif->tif_diroff = 0;
      if (!WriteOK(tif, &(tif->tif_diroff), sizeof (nextdir))) {
            TIFFErrorExt(tif->tif_clientdata, module, "Error writing directory link");
            return (0);
      }
    }

    /*
    ** Now use TIFFWriteDirectory() normally.
    */

    return TIFFWriteDirectory( tif );
}


/*
 * Link the current directory into the
 * directory chain for the file.
 */
static int
TIFFLinkDirectory(TIFF* tif)
{
      static const char module[] = "TIFFLinkDirectory";
      toff_t nextdir;
      toff_t diroff, off;

      tif->tif_diroff = (TIFFSeekFile(tif, (toff_t) 0, SEEK_END)+1) &~ 1;
      diroff = tif->tif_diroff;
      if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabLong(&diroff);

      /*
       * Handle SubIFDs
       */
        if (tif->tif_flags & TIFF_INSUBIFD) {
            (void) TIFFSeekFile(tif, tif->tif_subifdoff, SEEK_SET);
            if (!WriteOK(tif, &diroff, sizeof (diroff))) {
                  TIFFErrorExt(tif->tif_clientdata, module,
                      "%s: Error writing SubIFD directory link",
                      tif->tif_name);
                  return (0);
            }
            /*
             * Advance to the next SubIFD or, if this is
             * the last one configured, revert back to the
             * normal directory linkage.
             */
            if (--tif->tif_nsubifd)
                  tif->tif_subifdoff += sizeof (diroff);
            else
                  tif->tif_flags &= ~TIFF_INSUBIFD;
            return (1);
      }

      if (tif->tif_header.tiff_diroff == 0) {
            /*
             * First directory, overwrite offset in header.
             */
            tif->tif_header.tiff_diroff = tif->tif_diroff;
            (void) TIFFSeekFile(tif,
                            (toff_t)(TIFF_MAGIC_SIZE+TIFF_VERSION_SIZE),
                                    SEEK_SET);
            if (!WriteOK(tif, &diroff, sizeof (diroff))) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing TIFF header");
                  return (0);
            }
            return (1);
      }
      /*
       * Not the first directory, search to the last and append.
       */
      nextdir = tif->tif_header.tiff_diroff;
      do {
            uint16 dircount;

            if (!SeekOK(tif, nextdir) ||
                !ReadOK(tif, &dircount, sizeof (dircount))) {
                  TIFFErrorExt(tif->tif_clientdata, module, "Error fetching directory count");
                  return (0);
            }
            if (tif->tif_flags & TIFF_SWAB)
                  TIFFSwabShort(&dircount);
            (void) TIFFSeekFile(tif,
                dircount * sizeof (TIFFDirEntry), SEEK_CUR);
            if (!ReadOK(tif, &nextdir, sizeof (nextdir))) {
                  TIFFErrorExt(tif->tif_clientdata, module, "Error fetching directory link");
                  return (0);
            }
            if (tif->tif_flags & TIFF_SWAB)
                  TIFFSwabLong(&nextdir);
      } while (nextdir != 0);
        off = TIFFSeekFile(tif, 0, SEEK_CUR); /* get current offset */
        (void) TIFFSeekFile(tif, off - (toff_t)sizeof(nextdir), SEEK_SET);
      if (!WriteOK(tif, &diroff, sizeof (diroff))) {
            TIFFErrorExt(tif->tif_clientdata, module, "Error writing directory link");
            return (0);
      }
      return (1);
}

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