tif_pdsdirwrite.c

tiff格式传真源码例子

	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 > 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 > 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 = 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 = 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 = 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 = 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, v);
				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] = 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 = 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 = 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:
		{ unsigned char* bp = (unsigned char*) w;
		  for (i = 0; i < n; i++)
			bp[i] = (unsigned char) v[i];
		  dir->tdir_tag = tag;
		  dir->tdir_type = (short) type;
		  dir->tdir_count = n;
		  if (!TIFFWriteByteArray(tif, dir, (char*) bp))
			goto out;
		}
		break;
	case TIFF_SBYTE:
		{ signed char* bp = (signed char*) w;
		  for (i = 0; i < n; i++)
			bp[i] = (signed char) v[i];
		  dir->tdir_tag = 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 < 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 < 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 < 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 < 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 < 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

/*
 * 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);
}

/*
 * Link the current directory into the
 * directory chain for the file.
 */
static int
TIFFLinkDirectory(TIFF* tif)
{
	static const char module[] = "TIFFLinkDirectory";
	uint32 nextdir;
	uint32 diroff;

	tif->tif_diroff = (TIFFSeekFile(tif, (toff_t) 0, SEEK_END)+1) &~ 1;
	diroff = (uint32) 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 = (uint32) 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);
	(void) TIFFSeekFile(tif, -(toff_t) sizeof (nextdir), SEEK_CUR);
	if (!WriteOK(tif, &diroff, sizeof (diroff))) {
		TIFFError(module, "Error writing directory link");
		return (0);
	}
	return (1);
}