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/**********************************************************************
*
* geo_write.c -- Public routines for GEOTIFF GeoKey access.
*
* Written By: Niles D. Ritter.
*
* copyright (c) 1995 Niles D. Ritter
*
* Permission granted to use this software, so long as this copyright
* notice accompanies any source code derived therefrom.
*
**********************************************************************/
#include "geotiffio.h" /* public interface */
#include "geo_tiffp.h" /* external TIFF interface */
#include "geo_keyp.h" /* private interface */
static int WriteKey(GTIF* gt, TempKeyData* tempData,
KeyEntry* entptr, GeoKey* keyptr);
static int SortKeys(GTIF* gt,int *sortkeys);
/**
This function flushes all the GeoTIFF keys that have been set with the
GTIFKeySet() function into the associated
TIFF file.
@param gt The GeoTIFF handle returned by GTIFNew.
GTIFWriteKeys() should be called before
GTIFFree() is used to deallocate a GeoTIFF access handle.
*/
int GTIFWriteKeys(GTIF *gt)
{
if (!(gt->gt_flags & FLAG_FILE_MODIFIED)) return 1;
if( gt->gt_tif == NULL )
return 0;
TempKeyData tempData;
tempData.tk_asciiParams = 0;
tempData.tk_asciiParamsLength = 0;
tempData.tk_asciiParamsOffset = 0;
/* Sort the Keys into numerical order */
int sortkeys[MAX_KEYS];
if (!SortKeys(gt,sortkeys))
{
/* XXX error: a key was not recognized */
}
/* Set up header of ProjectionInfo tag */
KeyHeader *header = (KeyHeader *)gt->gt_short;
header->hdr_num_keys = (pinfo_t) gt->gt_num_keys;
header->hdr_version = gt->gt_version;
header->hdr_rev_major = gt->gt_rev_major;
header->hdr_rev_minor = gt->gt_rev_minor;
/* Sum up the ASCII tag lengths */
for (int i = 0; i < gt->gt_num_keys; i++)
{
GeoKey *keyptr = gt->gt_keys + sortkeys[i];
if (keyptr->gk_type == TYPE_ASCII)
{
tempData.tk_asciiParamsLength += keyptr->gk_count;
}
}
if (tempData.tk_asciiParamsLength > 0)
{
tempData.tk_asciiParams =
(char *)_GTIFcalloc(tempData.tk_asciiParamsLength + 1);
if( tempData.tk_asciiParams == NULL )
return 0;
tempData.tk_asciiParams[tempData.tk_asciiParamsLength] = '\0';
}
/* Set up the rest of SHORT array properly */
GeoKey *keyptr = gt->gt_keys;
KeyEntry *entptr = (KeyEntry*)(gt->gt_short + 4);
for (int i=0; i< gt->gt_num_keys; i++,entptr++)
{
if (!WriteKey(gt,&tempData,entptr,keyptr+sortkeys[i]))
{
if (tempData.tk_asciiParamsLength > 0)
{
_GTIFFree (tempData.tk_asciiParams);
}
return 0;
}
}
/* Write out the Key Directory */
(gt->gt_methods.set)(gt->gt_tif, GTIFF_GEOKEYDIRECTORY, gt->gt_nshorts, gt->gt_short );
/* Write out the params directories */
if (gt->gt_ndoubles)
(gt->gt_methods.set)(gt->gt_tif, GTIFF_DOUBLEPARAMS, gt->gt_ndoubles, gt->gt_double );
if (tempData.tk_asciiParamsLength > 0)
{
/* just to be safe */
tempData.tk_asciiParams[tempData.tk_asciiParamsLength] = '\0';
(gt->gt_methods.set)(gt->gt_tif,
GTIFF_ASCIIPARAMS, 0, tempData.tk_asciiParams);
}
gt->gt_flags &= ~FLAG_FILE_MODIFIED;
if (tempData.tk_asciiParamsLength > 0)
{
_GTIFFree (tempData.tk_asciiParams);
}
return 1;
}
/**********************************************************************
*
* Private Routines
*
**********************************************************************/
/*
* Given GeoKey, write out the KeyEntry entries, returning 0 if failure.
* This is the exact complement of ReadKey().
*/
static int WriteKey(GTIF* gt, TempKeyData* tempData,
KeyEntry* entptr, GeoKey* keyptr)
{
entptr->ent_key = (pinfo_t) keyptr->gk_key;
entptr->ent_count = (pinfo_t) keyptr->gk_count;
const int count = entptr->ent_count;
if (count==1 && keyptr->gk_type==TYPE_SHORT)
{
entptr->ent_location = GTIFF_LOCAL;
memcpy(&(entptr->ent_val_offset), &keyptr->gk_data, sizeof(pinfo_t));
return 1;
}
switch (keyptr->gk_type)
{
case TYPE_SHORT:
entptr->ent_location = GTIFF_GEOKEYDIRECTORY;
entptr->ent_val_offset = (pinfo_t)
((pinfo_t*)keyptr->gk_data - gt->gt_short);
break;
case TYPE_DOUBLE:
entptr->ent_location = GTIFF_DOUBLEPARAMS;
entptr->ent_val_offset = (pinfo_t)
((double*)keyptr->gk_data - gt->gt_double);
break;
case TYPE_ASCII:
if( tempData->tk_asciiParams == NULL )
return 0;
entptr->ent_location = GTIFF_ASCIIPARAMS;
entptr->ent_val_offset = (pinfo_t) tempData->tk_asciiParamsOffset;
_GTIFmemcpy (tempData->tk_asciiParams + tempData->tk_asciiParamsOffset
, keyptr->gk_data, keyptr->gk_count);
tempData->tk_asciiParams[tempData->tk_asciiParamsOffset+keyptr->gk_count-1] = '|';
tempData->tk_asciiParamsOffset += keyptr->gk_count;
break;
default:
return 0; /* failure */
}
return 1; /* success */
}
/*
* Numerically sort the GeoKeys.
* We just do a linear search through
* the list and pull out the keys that were set.
*/
static int SortKeys(GTIF* gt,int *sortkeys)
{
/* A bit convoluted to make Clang Static Analyzer happy */
if( gt->gt_num_keys <= 0 )
return 1;
sortkeys[0] = 1;
for( int i = 1; i < gt->gt_num_keys; i++ )
sortkeys[i] = i+1;
int did_work;
do { /* simple bubble sort */
did_work = 0;
for( int i = 0; i < gt->gt_num_keys-1; i++ )
{
if( gt->gt_keys[sortkeys[i]].gk_key
> gt->gt_keys[sortkeys[i+1]].gk_key )
{
/* swap keys in sort list */
int j = sortkeys[i];
sortkeys[i] = sortkeys[i+1];
sortkeys[i+1] = j;
did_work = 1;
}
}
} while( did_work );
return 1;
}
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