tif_dir.c

一个国人自己实现图像库的程序（有参考价值）

/* $Header: /cvsroot/osrs/libtiff/libtiff/tif_dir.c,v 1.16 2001/09/25 01:33:54 warmerda Exp $ */

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

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

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

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

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

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

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

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

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

	switch (tag) {
	case TIFFTAG_SUBFILETYPE:
		td->td_subfiletype = va_arg(ap, uint32);
		break;
	case TIFFTAG_IMAGEWIDTH:
		td->td_imagewidth = va_arg(ap, uint32);
		break;
	case TIFFTAG_IMAGELENGTH:
		td->td_imagelength = va_arg(ap, uint32);
		break;
	case TIFFTAG_BITSPERSAMPLE:
		td->td_bitspersample = (uint16) va_arg(ap, int);
		/*
		 * If the data require post-decoding processing
		 * to byte-swap samples, set it up here.  Note
		 * that since tags are required to be ordered,
		 * compression code can override this behaviour
		 * in the setup method if it wants to roll the
		 * post decoding work in with its normal work.
		 */
		if (tif->tif_flags & TIFF_SWAB) {
			if (td->td_bitspersample == 16)
				tif->tif_postdecode = _TIFFSwab16BitData;
			else if (td->td_bitspersample == 32)
				tif->tif_postdecode = _TIFFSwab32BitData;
			else if (td->td_bitspersample == 64)
				tif->tif_postdecode = _TIFFSwab64BitData;
		}
		break;
	case TIFFTAG_COMPRESSION:
		v = va_arg(ap, int) & 0xffff;
		/*
		 * If we're changing the compression scheme,
		 * the notify the previous module so that it
		 * can cleanup any state it's setup.
		 */
		if (TIFFFieldSet(tif, FIELD_COMPRESSION)) {
			if (td->td_compression == v)
				break;
			(*tif->tif_cleanup)(tif);
			tif->tif_flags &= ~TIFF_CODERSETUP;
		}
		/*
		 * Setup new compression routine state.
		 */
		if( (status = TIFFSetCompressionScheme(tif, v)) != 0 )
                    td->td_compression = v;
                else
                    status = 0;
		break;
	case TIFFTAG_PHOTOMETRIC:
		td->td_photometric = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_THRESHHOLDING:
		td->td_threshholding = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_FILLORDER:
		v = va_arg(ap, int);
		if (v != FILLORDER_LSB2MSB && v != FILLORDER_MSB2LSB)
			goto badvalue;
		td->td_fillorder = (uint16) v;
		break;
	case TIFFTAG_DOCUMENTNAME:
		_TIFFsetString(&td->td_documentname, va_arg(ap, char*));
		break;
	case TIFFTAG_ARTIST:
		_TIFFsetString(&td->td_artist, va_arg(ap, char*));
		break;
	case TIFFTAG_DATETIME:
		_TIFFsetString(&td->td_datetime, va_arg(ap, char*));
		break;
	case TIFFTAG_HOSTCOMPUTER:
		_TIFFsetString(&td->td_hostcomputer, va_arg(ap, char*));
		break;
	case TIFFTAG_IMAGEDESCRIPTION:
		_TIFFsetString(&td->td_imagedescription, va_arg(ap, char*));
		break;
	case TIFFTAG_MAKE:
		_TIFFsetString(&td->td_make, va_arg(ap, char*));
		break;
	case TIFFTAG_MODEL:
		_TIFFsetString(&td->td_model, va_arg(ap, char*));
		break;
	case TIFFTAG_SOFTWARE:
		_TIFFsetString(&td->td_software, va_arg(ap, char*));
		break;
	case TIFFTAG_COPYRIGHT:
		_TIFFsetString(&td->td_copyright, va_arg(ap, char*));
		break;
	case TIFFTAG_ORIENTATION:
		v = va_arg(ap, int);
		if (v < ORIENTATION_TOPLEFT || ORIENTATION_LEFTBOT < v) {
			TIFFWarning(tif->tif_name,
			    "Bad value %ld for \"%s\" tag ignored",
			    v, _TIFFFieldWithTag(tif, tag)->field_name);
		} else
			td->td_orientation = (uint16) v;
		break;
	case TIFFTAG_SAMPLESPERPIXEL:
		/* XXX should cross check -- e.g. if pallette, then 1 */
		v = va_arg(ap, int);
		if (v == 0)
			goto badvalue;
		td->td_samplesperpixel = (uint16) v;
		break;
	case TIFFTAG_ROWSPERSTRIP:
		v32 = va_arg(ap, uint32);
		if (v32 == 0)
			goto badvalue32;
		td->td_rowsperstrip = v32;
		if (!TIFFFieldSet(tif, FIELD_TILEDIMENSIONS)) {
			td->td_tilelength = v32;
			td->td_tilewidth = td->td_imagewidth;
		}
		break;
	case TIFFTAG_MINSAMPLEVALUE:
		td->td_minsamplevalue = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_MAXSAMPLEVALUE:
		td->td_maxsamplevalue = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_SMINSAMPLEVALUE:
		td->td_sminsamplevalue = (double) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_SMAXSAMPLEVALUE:
		td->td_smaxsamplevalue = (double) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_XRESOLUTION:
		td->td_xresolution = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_YRESOLUTION:
		td->td_yresolution = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_PLANARCONFIG:
		v = va_arg(ap, int);
		if (v != PLANARCONFIG_CONTIG && v != PLANARCONFIG_SEPARATE)
			goto badvalue;
		td->td_planarconfig = (uint16) v;
		break;
	case TIFFTAG_PAGENAME:
		_TIFFsetString(&td->td_pagename, va_arg(ap, char*));
		break;
	case TIFFTAG_XPOSITION:
		td->td_xposition = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_YPOSITION:
		td->td_yposition = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_RESOLUTIONUNIT:
		v = va_arg(ap, int);
		if (v < RESUNIT_NONE || RESUNIT_CENTIMETER < v)
			goto badvalue;
		td->td_resolutionunit = (uint16) v;
		break;
	case TIFFTAG_PAGENUMBER:
		td->td_pagenumber[0] = (uint16) va_arg(ap, int);
		td->td_pagenumber[1] = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_HALFTONEHINTS:
		td->td_halftonehints[0] = (uint16) va_arg(ap, int);
		td->td_halftonehints[1] = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_COLORMAP:
		v32 = (uint32)(1L<<td->td_bitspersample);
		_TIFFsetShortArray(&td->td_colormap[0], va_arg(ap, uint16*), v32);
		_TIFFsetShortArray(&td->td_colormap[1], va_arg(ap, uint16*), v32);
		_TIFFsetShortArray(&td->td_colormap[2], va_arg(ap, uint16*), v32);
		break;
	case TIFFTAG_EXTRASAMPLES:
		if (!setExtraSamples(td, ap, &v))
			goto badvalue;
		break;
	case TIFFTAG_MATTEING:
		td->td_extrasamples = (uint16) (va_arg(ap, int) != 0);
		if (td->td_extrasamples) {
			uint16 sv = EXTRASAMPLE_ASSOCALPHA;
			_TIFFsetShortArray(&td->td_sampleinfo, &sv, 1);
		}
		break;
	case TIFFTAG_TILEWIDTH:
		v32 = va_arg(ap, uint32);
		if (v32 % 16) {
			if (tif->tif_mode != O_RDONLY)
				goto badvalue32;
			TIFFWarning(tif->tif_name,
			    "Nonstandard tile width %d, convert file", v32);
		}
		td->td_tilewidth = v32;
		tif->tif_flags |= TIFF_ISTILED;
		break;
	case TIFFTAG_TILELENGTH:
		v32 = va_arg(ap, uint32);
		if (v32 % 16) {
			if (tif->tif_mode != O_RDONLY)
				goto badvalue32;
			TIFFWarning(tif->tif_name,
			    "Nonstandard tile length %d, convert file", v32);
		}
		td->td_tilelength = v32;
		tif->tif_flags |= TIFF_ISTILED;
		break;
	case TIFFTAG_TILEDEPTH:
		v32 = va_arg(ap, uint32);
		if (v32 == 0)
			goto badvalue32;
		td->td_tiledepth = v32;
		break;
	case TIFFTAG_DATATYPE:
		v = va_arg(ap, int);
		switch (v) {
		case DATATYPE_VOID:	v = SAMPLEFORMAT_VOID;	break;
		case DATATYPE_INT:	v = SAMPLEFORMAT_INT;	break;
		case DATATYPE_UINT:	v = SAMPLEFORMAT_UINT;	break;
		case DATATYPE_IEEEFP:	v = SAMPLEFORMAT_IEEEFP;break;
		default:		goto badvalue;
		}
		td->td_sampleformat = (uint16) v;
		break;
	case TIFFTAG_SAMPLEFORMAT:
		v = va_arg(ap, int);
		if (v < SAMPLEFORMAT_UINT || SAMPLEFORMAT_COMPLEXIEEEFP < v)
			goto badvalue;
		td->td_sampleformat = (uint16) v;
		break;
	case TIFFTAG_IMAGEDEPTH:
		td->td_imagedepth = va_arg(ap, uint32);
		break;
	case TIFFTAG_STONITS:
		d = va_arg(ap, dblparam_t);
		if (d <= 0.)
			goto badvaluedbl;
		td->td_stonits = d;
		break;

	/* Begin Pixar Tags */
 	case TIFFTAG_PIXAR_IMAGEFULLWIDTH:
 		td->td_imagefullwidth = va_arg(ap, uint32);
 		break;
 	case TIFFTAG_PIXAR_IMAGEFULLLENGTH:
 		td->td_imagefulllength = va_arg(ap, uint32);
 		break;
 	case TIFFTAG_PIXAR_TEXTUREFORMAT:
 		_TIFFsetString(&td->td_textureformat, va_arg(ap, char*));
 		break;
 	case TIFFTAG_PIXAR_WRAPMODES:
 		_TIFFsetString(&td->td_wrapmodes, va_arg(ap, char*));
 		break;
 	case TIFFTAG_PIXAR_FOVCOT:
 		td->td_fovcot = (float) va_arg(ap, dblparam_t);
 		break;
 	case TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN:
 		_TIFFsetFloatArray(&td->td_matrixWorldToScreen,
 			va_arg(ap, float*), 16);
 		break;
 	case TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA:
 		_TIFFsetFloatArray(&td->td_matrixWorldToCamera,
 			va_arg(ap, float*), 16);
 		break;
 	/* End Pixar Tags */	       

#if SUBIFD_SUPPORT
	case TIFFTAG_SUBIFD:
		if ((tif->tif_flags & TIFF_INSUBIFD) == 0) {
			td->td_nsubifd = (uint16) va_arg(ap, int);
			_TIFFsetLongArray(&td->td_subifd, va_arg(ap, uint32*),
			    (long) td->td_nsubifd);
		} else {
			TIFFError(tif->tif_name, "Sorry, cannot nest SubIFDs");
			status = 0;
		}
		break;
#endif
#ifdef YCBCR_SUPPORT
	case TIFFTAG_YCBCRCOEFFICIENTS:
		_TIFFsetFloatArray(&td->td_ycbcrcoeffs, va_arg(ap, float*), 3);
		break;
	case TIFFTAG_YCBCRPOSITIONING:
		td->td_ycbcrpositioning = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_YCBCRSUBSAMPLING:
		td->td_ycbcrsubsampling[0] = (uint16) va_arg(ap, int);
		td->td_ycbcrsubsampling[1] = (uint16) va_arg(ap, int);
		break;
#endif
#ifdef COLORIMETRY_SUPPORT
	case TIFFTAG_WHITEPOINT:
		_TIFFsetFloatArray(&td->td_whitepoint, va_arg(ap, float*), 2);
		break;
	case TIFFTAG_PRIMARYCHROMATICITIES:
		_TIFFsetFloatArray(&td->td_primarychromas, va_arg(ap, float*), 6);
		break;
	case TIFFTAG_TRANSFERFUNCTION:
		v = (td->td_samplesperpixel - td->td_extrasamples) > 1 ? 3 : 1;
		for (i = 0; i < v; i++)
			_TIFFsetShortArray(&td->td_transferfunction[i],
			    va_arg(ap, uint16*), 1L<<td->td_bitspersample);
		break;
	case TIFFTAG_REFERENCEBLACKWHITE:
		/* XXX should check for null range */
		_TIFFsetFloatArray(&td->td_refblackwhite, va_arg(ap, float*), 6);
		break;
#endif
#ifdef CMYK_SUPPORT
	case TIFFTAG_INKSET:
		td->td_inkset = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_DOTRANGE:
		/* XXX should check for null range */
		td->td_dotrange[0] = (uint16) va_arg(ap, int);
		td->td_dotrange[1] = (uint16) va_arg(ap, int);
		break;