Source/Metadata/XTIFF.cpp - platform/external/free-image - Git at Google

 // ==========================================================
 // Metadata functions implementation
 // Extended TIFF Directory GEO Tag Support
 //
 // Design and implementation by
 // - Hervé Drolon ([email protected])
 // - Thorsten Radde ([email protected])
 //
 // Based on the LibTIFF xtiffio sample and on LibGeoTIFF
 //
 // This file is part of FreeImage 3
 //
 // COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
 // OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
 // THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
 // OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
 // CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
 // THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
 // SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
 // PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 // THIS DISCLAIMER.
 //
 // Use at your own risk!
 // ==========================================================

 #ifdef _MSC_VER
 #pragma warning (disable : 4786) // identifier was truncated to 'number' characters
 #endif

 #include "../LibTIFF/tiffiop.h"

 #include "FreeImage.h"
 #include "Utilities.h"
 #include "FreeImageTag.h"
 #include "FIRational.h"

 // ----------------------------------------------------------
 //   Extended TIFF Directory GEO Tag Support
 // ----------------------------------------------------------

 /**
   Tiff info structure.
   Entry format:
   { TAGNUMBER, ReadCount, WriteCount, DataType, FIELDNUM, OkToChange, PassDirCountOnSet, AsciiName }

   For ReadCount, WriteCount, -1 = unknown.
 */
 static const TIFFFieldInfo xtiffFieldInfo[] = {
 	{ TIFFTAG_GEOPIXELSCALE, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "GeoPixelScale" },
 	{ TIFFTAG_INTERGRAPH_MATRIX, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "Intergraph TransformationMatrix" },
 	{ TIFFTAG_GEOTRANSMATRIX, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "GeoTransformationMatrix" },
 	{ TIFFTAG_GEOTIEPOINTS,	-1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "GeoTiePoints" },
 	{ TIFFTAG_GEOKEYDIRECTORY,-1,-1, TIFF_SHORT, FIELD_CUSTOM, TRUE, TRUE, "GeoKeyDirectory" },
 	{ TIFFTAG_GEODOUBLEPARAMS, -1, -1, TIFF_DOUBLE,	FIELD_CUSTOM, TRUE,	TRUE, "GeoDoubleParams" },
 	{ TIFFTAG_GEOASCIIPARAMS, -1, -1, TIFF_ASCII, FIELD_CUSTOM, TRUE, FALSE, "GeoASCIIParams" },
 	{ TIFFTAG_JPL_CARTO_IFD, 1, 1, TIFF_LONG, FIELD_CUSTOM, TRUE, TRUE,	"JPL Carto IFD offset" }  /** Don't use this! **/
 };

 static void
 _XTIFFLocalDefaultDirectory(TIFF *tif) {
 	int tag_size = sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]);
     // Install the extended Tag field info
     TIFFMergeFieldInfo(tif, xtiffFieldInfo, tag_size);
 }

 static TIFFExtendProc _ParentExtender;

 /**
 This is the callback procedure, and is
 called by the DefaultDirectory method
 every time a new TIFF directory is opened.
 */
 static void
 _XTIFFDefaultDirectory(TIFF *tif) {
     // set up our own defaults
     _XTIFFLocalDefaultDirectory(tif);

 	/*
 	Since an XTIFF client module may have overridden
 	the default directory method, we call it now to
 	allow it to set up the rest of its own methods.
 	*/
     if (_ParentExtender)
         (*_ParentExtender)(tif);
 }

 /**
 XTIFF Initializer -- sets up the callback procedure for the TIFF module
 */
 void
 XTIFFInitialize(void) {
     static int first_time = 1;

     if (! first_time) return; /* Been there. Done that. */
     first_time = 0;

     // Grab the inherited method and install
     _ParentExtender = TIFFSetTagExtender(_XTIFFDefaultDirectory);
 }

 // ----------------------------------------------------------
 //   GeoTIFF tag reading / writing
 // ----------------------------------------------------------

 void
 tiff_read_geotiff_profile(TIFF *tif, FIBITMAP *dib) {
 	char defaultKey[16];

 	size_t tag_size = sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]);

 	TagLib& tag_lib = TagLib::instance();

 	for(unsigned i = 0; i < tag_size; i++) {

 		const TIFFFieldInfo *fieldInfo = &xtiffFieldInfo[i];

 		if(fieldInfo->field_type == TIFF_ASCII) {
 			char *params = NULL;

 			if(TIFFGetField(tif, fieldInfo->field_tag, &params)) {
 				// create a tag
 				FITAG *tag = FreeImage_CreateTag();
 				if(!tag) return;

 				WORD tag_id = (WORD)fieldInfo->field_tag;

 				FreeImage_SetTagType(tag, (FREE_IMAGE_MDTYPE)fieldInfo->field_type);
 				FreeImage_SetTagID(tag, tag_id);
 				FreeImage_SetTagKey(tag, tag_lib.getTagFieldName(TagLib::GEOTIFF, tag_id, defaultKey));
 				FreeImage_SetTagDescription(tag, tag_lib.getTagDescription(TagLib::GEOTIFF, tag_id));
 				FreeImage_SetTagLength(tag, (DWORD)strlen(params) + 1);
 				FreeImage_SetTagCount(tag, FreeImage_GetTagLength(tag));
 				FreeImage_SetTagValue(tag, params);
 				FreeImage_SetMetadata(FIMD_GEOTIFF, dib, FreeImage_GetTagKey(tag), tag);

 				// delete the tag
 				FreeImage_DeleteTag(tag);
 			}
 		} else {
 			short tag_count = 0;
 			void* data = NULL;

 			if(TIFFGetField(tif, fieldInfo->field_tag, &tag_count, &data)) {
 				// create a tag
 				FITAG *tag = FreeImage_CreateTag();
 				if(!tag) return;

 				WORD tag_id = (WORD)fieldInfo->field_tag;
 				FREE_IMAGE_MDTYPE tag_type = (FREE_IMAGE_MDTYPE)fieldInfo->field_type;

 				FreeImage_SetTagType(tag, tag_type);
 				FreeImage_SetTagID(tag, tag_id);
 				FreeImage_SetTagKey(tag, tag_lib.getTagFieldName(TagLib::GEOTIFF, tag_id, defaultKey));
 				FreeImage_SetTagDescription(tag, tag_lib.getTagDescription(TagLib::GEOTIFF, tag_id));
 				FreeImage_SetTagLength(tag, FreeImage_TagDataWidth((WORD)tag_type) * tag_count);
 				FreeImage_SetTagCount(tag, tag_count);
 				FreeImage_SetTagValue(tag, data);
 				FreeImage_SetMetadata(FIMD_GEOTIFF, dib, FreeImage_GetTagKey(tag), tag);

 				// delete the tag
 				FreeImage_DeleteTag(tag);
 			}
 		}
 	} // for(tag_size)
 }

 void
 tiff_write_geotiff_profile(TIFF *tif, FIBITMAP *dib) {
 	char defaultKey[16];

 	if(FreeImage_GetMetadataCount(FIMD_GEOTIFF, dib) == 0) {
 		return;
 	}

 	size_t tag_size = sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]);

 	TagLib& tag_lib = TagLib::instance();

 	for(unsigned i = 0; i < tag_size; i++) {
 		const TIFFFieldInfo *fieldInfo = &xtiffFieldInfo[i];

 		FITAG *tag = NULL;
 		const char *key = tag_lib.getTagFieldName(TagLib::GEOTIFF, (WORD)fieldInfo->field_tag, defaultKey);

 		if(FreeImage_GetMetadata(FIMD_GEOTIFF, dib, key, &tag)) {
 			if(FreeImage_GetTagType(tag) == FIDT_ASCII) {
 				TIFFSetField(tif, fieldInfo->field_tag, FreeImage_GetTagValue(tag));
 			} else {
 				TIFFSetField(tif, fieldInfo->field_tag, FreeImage_GetTagCount(tag), FreeImage_GetTagValue(tag));
 			}
 		}
 	}
 }

 // ----------------------------------------------------------
 //   EXIF tag reading
 // ----------------------------------------------------------

 BOOL tiff_read_exif_tags(TIFF *tif, TagLib::MDMODEL md_model, FIBITMAP *dib) {
     int  i;
     short count;

 	TagLib& tagLib = TagLib::instance();

 	TIFFDirectory *td = &tif->tif_dir;

 	count = (short) TIFFGetTagListCount(tif);
     for(i = 0; i < count; i++) {
         ttag_t tag = TIFFGetTagListEntry(tif, i);
         const TIFFFieldInfo *fip;
         uint32 value_count;
         int mem_alloc = 0;
         void *raw_data;

 		if(tag == TIFFTAG_EXIFIFD) continue;

 		// get the tag key - use NULL to avoid reading GeoTIFF tags
 		const char *key = tagLib.getTagFieldName(md_model, (WORD)tag, NULL);
 		if(key == NULL) continue;

 		fip = TIFFFieldWithTag(tif, tag);
         if(fip == NULL) continue;

 		if(fip->field_passcount) {
 			if (fip->field_readcount != TIFF_VARIABLE2) {
 				// assume TIFF_VARIABLE
 				uint16 value_count16;
 				if(TIFFGetField(tif, tag, &value_count16, &raw_data) != 1) continue;
 				value_count = value_count16;
 			} else {
 				if(TIFFGetField(tif, tag, &value_count, &raw_data) != 1) continue;
 			}
 		} else {
 			if (fip->field_readcount == TIFF_VARIABLE || fip->field_readcount == TIFF_VARIABLE2) {
 				value_count = 1;
 			} else if (fip->field_readcount == TIFF_SPP) {
 				value_count = td->td_samplesperpixel;
 			} else {
 				value_count = fip->field_readcount;
 			}
 			if (fip->field_type == TIFF_ASCII
 				|| fip->field_readcount == TIFF_VARIABLE
 				|| fip->field_readcount == TIFF_VARIABLE2
 				|| fip->field_readcount == TIFF_SPP
 				|| value_count > 1) {
 				if(TIFFGetField(tif, tag, &raw_data) != 1) continue;
 			} else {
 				raw_data = _TIFFmalloc(_TIFFDataSize(fip->field_type) * value_count);
 				mem_alloc = 1;
 				if(TIFFGetField(tif, tag, raw_data) != 1) {
 					_TIFFfree(raw_data);
 					continue;
 				}
 			}
 		}

 		// create a tag
 		FITAG *fitag = FreeImage_CreateTag();
 		if(!fitag) {
 			if(mem_alloc)
 				_TIFFfree(raw_data);
 			return FALSE;
 		}

 		FreeImage_SetTagID(fitag, (WORD)tag);
 		FreeImage_SetTagKey(fitag, key);

 		switch(fip->field_type) {
 			case TIFF_BYTE:
 				FreeImage_SetTagType(fitag, FIDT_BYTE);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_UNDEFINED:
 				FreeImage_SetTagType(fitag, FIDT_UNDEFINED);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_SBYTE:
 				FreeImage_SetTagType(fitag, FIDT_SBYTE);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_SHORT:
 				FreeImage_SetTagType(fitag, FIDT_SHORT);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_SSHORT:
 				FreeImage_SetTagType(fitag, FIDT_SSHORT);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_LONG:
 				FreeImage_SetTagType(fitag, FIDT_LONG);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_IFD:
 				FreeImage_SetTagType(fitag, FIDT_IFD);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_SLONG:
 				FreeImage_SetTagType(fitag, FIDT_SLONG);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_RATIONAL:
 			{
 				// LibTIFF converts rational to floats : reconvert floats to rationals
 				DWORD *rvalue = (DWORD*)malloc(2 * value_count * sizeof(DWORD));
 				for(uint32 i = 0; i < value_count; i++) {
 					float *fv = (float*)raw_data;
 					FIRational rational(fv[i]);
 					rvalue[2*i] = rational.getNumerator();
 					rvalue[2*i+1] = rational.getDenominator();
 				}
 				FreeImage_SetTagType(fitag, FIDT_RATIONAL);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, rvalue);
 				free(rvalue);
 			}
 			break;

 			case TIFF_SRATIONAL:
 			{
 				// LibTIFF converts rational to floats : reconvert floats to rationals
 				LONG *rvalue = (LONG*)malloc(2 * value_count * sizeof(LONG));
 				for(uint32 i = 0; i < value_count; i++) {
 					float *fv = (float*)raw_data;
 					FIRational rational(fv[i]);
 					rvalue[2*i] = rational.getNumerator();
 					rvalue[2*i+1] = rational.getDenominator();
 				}
 				FreeImage_SetTagType(fitag, FIDT_RATIONAL);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, rvalue);
 				free(rvalue);
 			}
 			break;

 			case TIFF_FLOAT:
 				FreeImage_SetTagType(fitag, FIDT_FLOAT);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			case TIFF_DOUBLE:
 				FreeImage_SetTagType(fitag, FIDT_DOUBLE);
 				FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
 				FreeImage_SetTagCount(fitag, value_count);
 				FreeImage_SetTagValue(fitag, raw_data);
 				break;

 			default:
 			{
 				size_t length = strlen((char*)raw_data) + 1;
 				FreeImage_SetTagType(fitag, FIDT_ASCII);
 				FreeImage_SetTagLength(fitag, (DWORD)length);
 				FreeImage_SetTagCount(fitag, (DWORD)length);
 				FreeImage_SetTagValue(fitag, raw_data);
 			}
 			break;
 		}

 		const char *description = tagLib.getTagDescription(md_model, (WORD)tag);
 		if(description) {
 			FreeImage_SetTagDescription(fitag, description);
 		}
 		// store the tag
 		FreeImage_SetMetadata(tagLib.getFreeImageModel(md_model), dib, FreeImage_GetTagKey(fitag), fitag);

 		// destroy the tag
 		FreeImage_DeleteTag(fitag);

 		if(mem_alloc)
 			_TIFFfree(raw_data);
     }

 	return TRUE;

 }
	// ==========================================================
	// Metadata functions implementation
	// Extended TIFF Directory GEO Tag Support
	//
	// Design and implementation by
	// - Hervé Drolon ([email protected])
	// - Thorsten Radde ([email protected])
	//
	// Based on the LibTIFF xtiffio sample and on LibGeoTIFF
	//
	// This file is part of FreeImage 3
	//
	// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
	// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
	// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
	// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
	// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
	// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
	// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
	// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
	// THIS DISCLAIMER.
	//
	// Use at your own risk!
	// ==========================================================

	#ifdef _MSC_VER
	#pragma warning (disable : 4786) // identifier was truncated to 'number' characters
	#endif

	#include "../LibTIFF/tiffiop.h"

	#include "FreeImage.h"
	#include "Utilities.h"
	#include "FreeImageTag.h"
	#include "FIRational.h"

	// ----------------------------------------------------------
	// Extended TIFF Directory GEO Tag Support
	// ----------------------------------------------------------

	/**
	Tiff info structure.
	Entry format:
	{ TAGNUMBER, ReadCount, WriteCount, DataType, FIELDNUM, OkToChange, PassDirCountOnSet, AsciiName }

	For ReadCount, WriteCount, -1 = unknown.
	*/
	static const TIFFFieldInfo xtiffFieldInfo[] = {
	{ TIFFTAG_GEOPIXELSCALE, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "GeoPixelScale" },
	{ TIFFTAG_INTERGRAPH_MATRIX, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "Intergraph TransformationMatrix" },
	{ TIFFTAG_GEOTRANSMATRIX, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "GeoTransformationMatrix" },
	{ TIFFTAG_GEOTIEPOINTS, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "GeoTiePoints" },
	{ TIFFTAG_GEOKEYDIRECTORY,-1,-1, TIFF_SHORT, FIELD_CUSTOM, TRUE, TRUE, "GeoKeyDirectory" },
	{ TIFFTAG_GEODOUBLEPARAMS, -1, -1, TIFF_DOUBLE, FIELD_CUSTOM, TRUE, TRUE, "GeoDoubleParams" },
	{ TIFFTAG_GEOASCIIPARAMS, -1, -1, TIFF_ASCII, FIELD_CUSTOM, TRUE, FALSE, "GeoASCIIParams" },
	{ TIFFTAG_JPL_CARTO_IFD, 1, 1, TIFF_LONG, FIELD_CUSTOM, TRUE, TRUE, "JPL Carto IFD offset" } / Don't use this! /
	};

	static void
	_XTIFFLocalDefaultDirectory(TIFF *tif) {
	int tag_size = sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]);
	// Install the extended Tag field info
	TIFFMergeFieldInfo(tif, xtiffFieldInfo, tag_size);
	}

	static TIFFExtendProc _ParentExtender;

	/**
	This is the callback procedure, and is
	called by the DefaultDirectory method
	every time a new TIFF directory is opened.
	*/
	static void
	_XTIFFDefaultDirectory(TIFF *tif) {
	// set up our own defaults
	_XTIFFLocalDefaultDirectory(tif);

	/*
	Since an XTIFF client module may have overridden
	the default directory method, we call it now to
	allow it to set up the rest of its own methods.
	*/
	if (_ParentExtender)
	(*_ParentExtender)(tif);
	}

	/**
	XTIFF Initializer -- sets up the callback procedure for the TIFF module
	*/
	void
	XTIFFInitialize(void) {
	static int first_time = 1;

	if (! first_time) return; /* Been there. Done that. */
	first_time = 0;

	// Grab the inherited method and install
	_ParentExtender = TIFFSetTagExtender(_XTIFFDefaultDirectory);
	}

	// ----------------------------------------------------------
	// GeoTIFF tag reading / writing
	// ----------------------------------------------------------

	void
	tiff_read_geotiff_profile(TIFF tif, FIBITMAP dib) {
	char defaultKey[16];

	size_t tag_size = sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]);

	TagLib& tag_lib = TagLib::instance();

	for(unsigned i = 0; i < tag_size; i++) {

	const TIFFFieldInfo *fieldInfo = &xtiffFieldInfo[i];

	if(fieldInfo->field_type == TIFF_ASCII) {
	char *params = NULL;

	if(TIFFGetField(tif, fieldInfo->field_tag, &params)) {
	// create a tag
	FITAG *tag = FreeImage_CreateTag();
	if(!tag) return;

	WORD tag_id = (WORD)fieldInfo->field_tag;

	FreeImage_SetTagType(tag, (FREE_IMAGE_MDTYPE)fieldInfo->field_type);
	FreeImage_SetTagID(tag, tag_id);
	FreeImage_SetTagKey(tag, tag_lib.getTagFieldName(TagLib::GEOTIFF, tag_id, defaultKey));
	FreeImage_SetTagDescription(tag, tag_lib.getTagDescription(TagLib::GEOTIFF, tag_id));
	FreeImage_SetTagLength(tag, (DWORD)strlen(params) + 1);
	FreeImage_SetTagCount(tag, FreeImage_GetTagLength(tag));
	FreeImage_SetTagValue(tag, params);
	FreeImage_SetMetadata(FIMD_GEOTIFF, dib, FreeImage_GetTagKey(tag), tag);

	// delete the tag
	FreeImage_DeleteTag(tag);
	}
	} else {
	short tag_count = 0;
	void* data = NULL;

	if(TIFFGetField(tif, fieldInfo->field_tag, &tag_count, &data)) {
	// create a tag
	FITAG *tag = FreeImage_CreateTag();
	if(!tag) return;

	WORD tag_id = (WORD)fieldInfo->field_tag;
	FREE_IMAGE_MDTYPE tag_type = (FREE_IMAGE_MDTYPE)fieldInfo->field_type;

	FreeImage_SetTagType(tag, tag_type);
	FreeImage_SetTagID(tag, tag_id);
	FreeImage_SetTagKey(tag, tag_lib.getTagFieldName(TagLib::GEOTIFF, tag_id, defaultKey));
	FreeImage_SetTagDescription(tag, tag_lib.getTagDescription(TagLib::GEOTIFF, tag_id));
	FreeImage_SetTagLength(tag, FreeImage_TagDataWidth((WORD)tag_type) * tag_count);
	FreeImage_SetTagCount(tag, tag_count);
	FreeImage_SetTagValue(tag, data);
	FreeImage_SetMetadata(FIMD_GEOTIFF, dib, FreeImage_GetTagKey(tag), tag);

	// delete the tag
	FreeImage_DeleteTag(tag);
	}
	}
	} // for(tag_size)
	}

	void
	tiff_write_geotiff_profile(TIFF tif, FIBITMAP dib) {
	char defaultKey[16];

	if(FreeImage_GetMetadataCount(FIMD_GEOTIFF, dib) == 0) {
	return;
	}

	size_t tag_size = sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]);

	TagLib& tag_lib = TagLib::instance();

	for(unsigned i = 0; i < tag_size; i++) {
	const TIFFFieldInfo *fieldInfo = &xtiffFieldInfo[i];

	FITAG *tag = NULL;
	const char *key = tag_lib.getTagFieldName(TagLib::GEOTIFF, (WORD)fieldInfo->field_tag, defaultKey);

	if(FreeImage_GetMetadata(FIMD_GEOTIFF, dib, key, &tag)) {
	if(FreeImage_GetTagType(tag) == FIDT_ASCII) {
	TIFFSetField(tif, fieldInfo->field_tag, FreeImage_GetTagValue(tag));
	} else {
	TIFFSetField(tif, fieldInfo->field_tag, FreeImage_GetTagCount(tag), FreeImage_GetTagValue(tag));
	}
	}
	}
	}

	// ----------------------------------------------------------
	// EXIF tag reading
	// ----------------------------------------------------------

	BOOL tiff_read_exif_tags(TIFF tif, TagLib::MDMODEL md_model, FIBITMAP dib) {
	int i;
	short count;

	TagLib& tagLib = TagLib::instance();

	TIFFDirectory *td = &tif->tif_dir;

	count = (short) TIFFGetTagListCount(tif);
	for(i = 0; i < count; i++) {
	ttag_t tag = TIFFGetTagListEntry(tif, i);
	const TIFFFieldInfo *fip;
	uint32 value_count;
	int mem_alloc = 0;
	void *raw_data;

	if(tag == TIFFTAG_EXIFIFD) continue;

	// get the tag key - use NULL to avoid reading GeoTIFF tags
	const char *key = tagLib.getTagFieldName(md_model, (WORD)tag, NULL);
	if(key == NULL) continue;

	fip = TIFFFieldWithTag(tif, tag);
	if(fip == NULL) continue;

	if(fip->field_passcount) {
	if (fip->field_readcount != TIFF_VARIABLE2) {
	// assume TIFF_VARIABLE
	uint16 value_count16;
	if(TIFFGetField(tif, tag, &value_count16, &raw_data) != 1) continue;
	value_count = value_count16;
	} else {
	if(TIFFGetField(tif, tag, &value_count, &raw_data) != 1) continue;
	}
	} else {
	if (fip->field_readcount == TIFF_VARIABLE \|\| fip->field_readcount == TIFF_VARIABLE2) {
	value_count = 1;
	} else if (fip->field_readcount == TIFF_SPP) {
	value_count = td->td_samplesperpixel;
	} else {
	value_count = fip->field_readcount;
	}
	if (fip->field_type == TIFF_ASCII
	\|\| fip->field_readcount == TIFF_VARIABLE
	\|\| fip->field_readcount == TIFF_VARIABLE2
	\|\| fip->field_readcount == TIFF_SPP
	\|\| value_count > 1) {
	if(TIFFGetField(tif, tag, &raw_data) != 1) continue;
	} else {
	raw_data = _TIFFmalloc(_TIFFDataSize(fip->field_type) * value_count);
	mem_alloc = 1;
	if(TIFFGetField(tif, tag, raw_data) != 1) {
	_TIFFfree(raw_data);
	continue;
	}
	}
	}

	// create a tag
	FITAG *fitag = FreeImage_CreateTag();
	if(!fitag) {
	if(mem_alloc)
	_TIFFfree(raw_data);
	return FALSE;
	}

	FreeImage_SetTagID(fitag, (WORD)tag);
	FreeImage_SetTagKey(fitag, key);

	switch(fip->field_type) {
	case TIFF_BYTE:
	FreeImage_SetTagType(fitag, FIDT_BYTE);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_UNDEFINED:
	FreeImage_SetTagType(fitag, FIDT_UNDEFINED);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_SBYTE:
	FreeImage_SetTagType(fitag, FIDT_SBYTE);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_SHORT:
	FreeImage_SetTagType(fitag, FIDT_SHORT);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_SSHORT:
	FreeImage_SetTagType(fitag, FIDT_SSHORT);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_LONG:
	FreeImage_SetTagType(fitag, FIDT_LONG);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_IFD:
	FreeImage_SetTagType(fitag, FIDT_IFD);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_SLONG:
	FreeImage_SetTagType(fitag, FIDT_SLONG);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_RATIONAL:
	{
	// LibTIFF converts rational to floats : reconvert floats to rationals
	DWORD rvalue = (DWORD)malloc(2 * value_count * sizeof(DWORD));
	for(uint32 i = 0; i < value_count; i++) {
	float fv = (float)raw_data;
	FIRational rational(fv[i]);
	rvalue[2*i] = rational.getNumerator();
	rvalue[2*i+1] = rational.getDenominator();
	}
	FreeImage_SetTagType(fitag, FIDT_RATIONAL);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, rvalue);
	free(rvalue);
	}
	break;

	case TIFF_SRATIONAL:
	{
	// LibTIFF converts rational to floats : reconvert floats to rationals
	LONG rvalue = (LONG)malloc(2 * value_count * sizeof(LONG));
	for(uint32 i = 0; i < value_count; i++) {
	float fv = (float)raw_data;
	FIRational rational(fv[i]);
	rvalue[2*i] = rational.getNumerator();
	rvalue[2*i+1] = rational.getDenominator();
	}
	FreeImage_SetTagType(fitag, FIDT_RATIONAL);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, rvalue);
	free(rvalue);
	}
	break;

	case TIFF_FLOAT:
	FreeImage_SetTagType(fitag, FIDT_FLOAT);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	case TIFF_DOUBLE:
	FreeImage_SetTagType(fitag, FIDT_DOUBLE);
	FreeImage_SetTagLength(fitag, TIFFDataWidth(fip->field_type) * value_count);
	FreeImage_SetTagCount(fitag, value_count);
	FreeImage_SetTagValue(fitag, raw_data);
	break;

	default:
	{
	size_t length = strlen((char*)raw_data) + 1;
	FreeImage_SetTagType(fitag, FIDT_ASCII);
	FreeImage_SetTagLength(fitag, (DWORD)length);
	FreeImage_SetTagCount(fitag, (DWORD)length);
	FreeImage_SetTagValue(fitag, raw_data);
	}
	break;
	}

	const char *description = tagLib.getTagDescription(md_model, (WORD)tag);
	if(description) {
	FreeImage_SetTagDescription(fitag, description);
	}
	// store the tag
	FreeImage_SetMetadata(tagLib.getFreeImageModel(md_model), dib, FreeImage_GetTagKey(fitag), fitag);

	// destroy the tag
	FreeImage_DeleteTag(fitag);

	if(mem_alloc)
	_TIFFfree(raw_data);
	}

	return TRUE;

	}