/* Header */

/*
 * 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"

#if 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  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*,
            TIFFDataType, ttag_t, TIFFDirEntry*, uint32, uint16*);
static  int TIFFWriteLongArray(TIFF *,
            TIFFDataType, ttag_t, TIFFDirEntry*, uint32, uint32*);
static  int TIFFWriteRationalArray(TIFF *,
            TIFFDataType, ttag_t, TIFFDirEntry*, uint32, float*);
static  int TIFFWriteFloatArray(TIFF *,
            TIFFDataType, ttag_t, TIFFDirEntry*, uint32, float*);
static  int TIFFWriteDoubleArray(TIFF *,
            TIFFDataType, ttag_t, TIFFDirEntry*, uint32, double*);
static  int TIFFWriteByteArray(TIFF*, TIFFDirEntry*, char*);
static  int TIFFWriteAnyArray(TIFF*,
            TIFFDataType, ttag_t, TIFFDirEntry*, uint32, double*);
#ifdef COLORIMETRY_SUPPORT
static  int TIFFWriteTransferFunction(TIFF*, TIFFDirEntry*);
#endif
#ifdef CMYK_SUPPORT
static  int TIFFWriteInkNames(TIFF*, TIFFDirEntry*);
#endif
static  int TIFFWriteData(TIFF*, TIFFDirEntry*, char*);
static  int TIFFLinkDirectory(TIFF*);

#define WriteRationalPair(type, tag1, v1, tag2, v2) {           \
        if (!TIFFWriteRational(tif, type, tag1, dir, v1))       \
                goto bad;                                       \
        if (!TIFFWriteRational(tif, type, tag2, dir+1, v2))     \
                goto bad;                                       \
        dir++;                                                  \
}
#define TIFFWriteRational(tif, type, tag, dir, v) \
        TIFFWriteRationalArray((tif), (type), (tag), (dir), 1, &(v))
#ifndef TIFFWriteRational
static  int TIFFWriteRational(TIFF*,
            TIFFDataType, ttag_t, TIFFDirEntry*, float);
#endif

/*
 * 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.
 */
int
TIFFWriteDirectory(TIFF* tif)
{
        uint16 dircount;
        toff_t diroff;
        ttag_t tag;
        uint32 nfields;
        tsize_t dirsize;
        char* data;
        TIFFDirEntry* dir;
        TIFFDirectory* td;
        u_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 (tif->tif_flags & TIFF_POSTENCODE) {
                tif->tif_flags &= ~TIFF_POSTENCODE;
                if (!(*tif->tif_postencode)(tif)) {
                        TIFFError(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)) {
                TIFFError(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))
                        nfields += (b < FIELD_SUBFILETYPE ? 2 : 1);
        dirsize = nfields * sizeof (TIFFDirEntry);
        data = (char*) _TIFFmalloc(dirsize);
        if (data == NULL) {
                TIFFError(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];
                if (!FieldSet(fields, fip->field_bit))
                        continue;
                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;
                        if (!TIFFWriteLongArray(tif, TIFF_LONG, tag, dir,
                            (uint32) td->td_nstrips, 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;
                        if (!TIFFWriteLongArray(tif, TIFF_LONG, tag, dir,
                            (uint32) td->td_nstrips, 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_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:
#ifdef YCBCR_SUPPORT
                case FIELD_YCBCRSUBSAMPLING:
#endif
#ifdef CMYK_SUPPORT
                case FIELD_DOTRANGE:
#endif
                        if (!TIFFSetupShortPair(tif, fip->field_tag, dir))
                                goto bad;
                        break;
#ifdef CMYK_SUPPORT
                case FIELD_INKNAMES:
                        if (!TIFFWriteInkNames(tif, dir))
                                goto bad;
                        break;
#endif
#ifdef COLORIMETRY_SUPPORT
                case FIELD_TRANSFERFUNCTION:
                        if (!TIFFWriteTransferFunction(tif, dir))
                                goto bad;
                        break;
#endif
#if SUBIFD_SUPPORT
                case FIELD_SUBIFD:
                        if (!TIFFWriteNormalTag(tif, dir, fip))
                                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;
#endif
                default:
                        if (!TIFFWriteNormalTag(tif, dir, fip))
                                goto bad;
                        break;
                }
                dir++;
                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))) {
                TIFFError(tif->tif_name, "Error writing directory count");
                goto bad;
        }
        if (!WriteOK(tif, data, dirsize)) {
                TIFFError(tif->tif_name, "Error writing directory contents");
                goto bad;
        }
        if (!WriteOK(tif, &diroff, sizeof (diroff))) {
                TIFFError(tif->tif_name, "Error writing directory link");
                goto bad;
        }
        TIFFFreeDirectory(tif);
        _TIFFfree(data);
        tif->tif_flags &= ~TIFF_DIRTYDIRECT;
        (*tif->tif_cleanup)(tif);

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

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

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

        /* added based on patch request from MARTIN.MCBRIDE.MM@agfa.co.uk,
           correctness not verified (FW, 99/08) */
        case TIFF_BYTE:
        case TIFF_SBYTE:          
                if (wc > 1) {
                    char* cp;
                    if (wc == (u_short) TIFF_VARIABLE) {
                        TIFFGetField(tif, fip->field_tag, &wc, &cp);
                        dir->tdir_count = wc;
                    } else if (wc == (u_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);
                } else {
                    char cv;
                    TIFFGetField(tif, fip->field_tag, &cv);
                    if (!TIFFWriteByteArray(tif, dir, &cv))
                        return (0);
                }
                break;

        case TIFF_UNDEFINED:
                { char* cp;
                  if (wc == (u_short) TIFF_VARIABLE) {
                        TIFFGetField(tif, fip->field_tag, &wc, &cp);
                        dir->tdir_count = wc;
                  } else if (wc == (u_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);
}
#undef WRITEF

/*
 * 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);
        }
}
#undef MakeShortDirent

#ifndef TIFFWriteRational
/*
 * Setup a RATIONAL directory entry and
 * write the associated indirect value.
 */
static int
TIFFWriteRational(TIFF* tif,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir, float v)
{
        return (TIFFWriteRationalArray(tif, type, tag, dir, 1, &v));
}
#endif

#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;
        int i, status, samples = tif->tif_dir.td_samplesperpixel;

        if (samples > (int)NITEMS(buf))
                w = (uint16*) _TIFFmalloc(samples * sizeof (uint16));
        TIFFGetField(tif, tag, &v);
        for (i = 0; i < samples; i++)
                w[i] = v;
        status = TIFFWriteShortArray(tif, TIFF_SHORT, tag, dir, samples, 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;
        int i, status;
        int samples = (int) tif->tif_dir.td_samplesperpixel;

        if (samples > (int)NITEMS(buf))
                w = (double*) _TIFFmalloc(samples * sizeof (double));
        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]);
        return (TIFFWriteShortArray(tif, TIFF_SHORT, tag, dir, 2, 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,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir, uint32 n, uint16* v)
{
        dir->tdir_tag = (uint16) tag;
        dir->tdir_type = (short) type;
        dir->tdir_count = n;
        if (n <= 2) {
                if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
                        dir->tdir_offset = (uint32) ((long) v[0] << 16);
                        if (n == 2)
                                dir->tdir_offset |= v[1] & 0xffff;
                } else {
                        dir->tdir_offset = v[0] & 0xffff;
                        if (n == 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,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir, uint32 n, uint32* v)
{
        dir->tdir_tag = (uint16) tag;
        dir->tdir_type = (short) type;
        dir->tdir_count = n;
        if (n == 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,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir, uint32 n, float* v)
{
        uint32 i;
        uint32* t;
        int status;

        dir->tdir_tag = (uint16) tag;
        dir->tdir_type = (short) type;
        dir->tdir_count = n;
        t = (uint32*) _TIFFmalloc(2*n * sizeof (uint32));
        for (i = 0; i < n; i++) {
                float fv = v[i];
                int sign = 1;
                uint32 den;

                if (fv < 0) {
                        if (type == TIFF_RATIONAL) {
                                TIFFWarning(tif->tif_name,
        "\"%s\": Information lost writing value (%g) as (unsigned) RATIONAL",
                                _TIFFFieldWithTag(tif,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,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir, uint32 n, float* v)
{
        dir->tdir_tag = (uint16) tag;
        dir->tdir_type = (short) type;
        dir->tdir_count = n;
        TIFFCvtNativeToIEEEFloat(tif, n, v);
        if (n == 1) {
                dir->tdir_offset = *(uint32*) &v[0];
                return (1);
        } else
                return (TIFFWriteData(tif, dir, (char*) v));
}

static int
TIFFWriteDoubleArray(TIFF* tif,
    TIFFDataType type, ttag_t tag, TIFFDirEntry* dir, uint32 n, double* v)
{
        dir->tdir_tag = (uint16) tag;
        dir->tdir_type = (short) type;
        dir->tdir_count = n;
        TIFFCvtNativeToIEEEDouble(tif, n, 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]);
        switch (type) {
        case TIFF_BYTE:
                { uint8* bp = (uint8*) w;
                  for (i = 0; i < (int) n; i++)
                        bp[i] = (uint8) v[i];
                  dir->tdir_tag = (uint16) tag;
                  dir->tdir_type = (short) type;
                  dir->tdir_count = n;
                  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];
                  dir->tdir_tag = (uint16) tag;
                  dir->tdir_type = (short) type;
                  dir->tdir_count = n;
                  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, type, tag, dir, n, (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, type, tag, dir, n, (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, type, tag, dir, n, 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, type, tag, dir, n, (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, type, tag, dir, n, bp))
                        goto out;
                }
                break;
        case TIFF_DOUBLE:
                return (TIFFWriteDoubleArray(tif, type, tag, dir, n, v));
        default:
                /* TIFF_NOTYPE */
                /* TIFF_ASCII */
                /* TIFF_UNDEFINED */
                /* TIFF_RATIONAL */
                /* TIFF_SRATIONAL */
                goto out;
        }
        status = 1;
 out:
        if (w != buf)
                _TIFFfree(w);
        return (status);
}

#ifdef COLORIMETRY_SUPPORT
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));
}
#endif

#ifdef CMYK_SUPPORT
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));
}
#endif

/*
 * 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[dir->tdir_type];
        if (SeekOK(tif, dir->tdir_offset) &&
            WriteOK(tif, cp, cc)) {
                tif->tif_dataoff += (cc + 1) & ~1;
                return (1);
        }
        TIFFError(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;

#define HDROFF(f)       ((toff_t) &(((TIFFHeader*) 0)->f))
        TIFFSeekFile(tif, HDROFF(tiff_diroff), SEEK_SET);
        if (!WriteOK(tif, &(tif->tif_header.tiff_diroff), 
                     sizeof (tif->tif_diroff))) 
        {
            TIFFError(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))) {
                        TIFFError(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))) {
                        TIFFError(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))) {
                TIFFError(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);
#if SUBIFD_SUPPORT
        if (tif->tif_flags & TIFF_INSUBIFD) {
                (void) TIFFSeekFile(tif, tif->tif_subifdoff, SEEK_SET);
                if (!WriteOK(tif, &diroff, sizeof (diroff))) {
                        TIFFError(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);
        }
#endif
        if (tif->tif_header.tiff_diroff == 0) {
                /*
                 * First directory, overwrite offset in header.
                 */
                tif->tif_header.tiff_diroff = tif->tif_diroff;
#define HDROFF(f)       ((toff_t) &(((TIFFHeader*) 0)->f))
                (void) TIFFSeekFile(tif, HDROFF(tiff_diroff), SEEK_SET);
                if (!WriteOK(tif, &diroff, sizeof (diroff))) {
                        TIFFError(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))) {
                        TIFFError(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))) {
                        TIFFError(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))) {
                TIFFError(module, "Error writing directory link");
                return (0);
        }
        return (1);
}
