EVOLUTION-MANAGER

Edit File: geo_set.c

/**********************************************************************
 *
 *  geo_set.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 products derived therefrom.
 *
 **********************************************************************/

#include "geotiff.h"   /* public interface        */
#include "geo_tiffp.h" /* external TIFF interface */
#include "geo_keyp.h"  /* private interface       */

#include <assert.h>

/**
This function writes a geokey_t value to a GeoTIFF file.

@param gtif The geotiff information handle from GTIFNew().

@param keyID The geokey_t name (such as ProjectedCSTypeGeoKey).
This must come from the list of legal geokey_t values
(an enumeration) listed below.

@param type Type of the key.

@param count Indicates how many values
to read. At this time all keys except for strings have only one value,
so index should be zero, and count should be one.

The keyID indicates the key name to be written to the
file and should from the geokey_t enumeration
(eg. <tt>ProjectedCSTypeGeoKey</tt>). The full list of possible geokey_t
values can be found in geokeys.inc, or in the online documentation for
GTIFKeyGet().

The type should be one of TYPE_SHORT, TYPE_ASCII, or TYPE_DOUBLE and
will indicate the type of value being passed at the end of the argument
list (the key value). The count should be one except for strings
when it should be the length of the string (or zero to for this to be
computed internally). As a special case a count of -1 can be
used to request an existing key be deleted, in which no value is passed.

The actual value is passed at the end of the argument list, and should be
a short, a double, or a char * value. Note that short and double values
are passed by value rather than as pointers when count is 1, but as pointers
if count is larger than 1.

Note that key values aren't actually flushed to the file until
GTIFWriteKeys() is called. Till then
the new values are just kept with the GTIF structure.

Example:

<pre>
 GTIFKeySet(gtif, GTRasterTypeGeoKey, TYPE_SHORT, 1,
 RasterPixelIsArea);
 GTIFKeySet(gtif, GTCitationGeoKey, TYPE_ASCII, 0,
 "UTM 11 North / NAD27" );
</pre>

int GTIFKeySet(GTIF *gtif, geokey_t keyID, tagtype_t type, int count,...)
{
    va_list ap;
    int nIndex = gtif->gt_keyindex[ keyID ];
    int newvalues = 0;
    GeoKey *key;
    char *data = NULL;
    char *val = NULL;
    pinfo_t sval;
    double dval;

va_start(ap, count);
    /* pass singleton keys by value */
    if (count>1 && type!=TYPE_ASCII)
    {
        val = va_arg(ap, char*);
    }
    else if( count == -1 )
    {
        /* delete the indicated tag */
        va_end(ap);

if( nIndex < 1 )
 return 0;

if (gtif->gt_keys[nIndex].gk_type == TYPE_ASCII)
        {
            _GTIFFree (gtif->gt_keys[nIndex].gk_data);
        }

while( nIndex < gtif->gt_num_keys )
 {
 _GTIFmemcpy( gtif->gt_keys + nIndex,
 gtif->gt_keys + nIndex + 1,
 sizeof(GeoKey) );
 gtif->gt_keyindex[gtif->gt_keys[nIndex].gk_key] = nIndex;
 nIndex++;
 }

gtif->gt_num_keys--;
        gtif->gt_nshorts -= sizeof(KeyEntry)/sizeof(pinfo_t);
        gtif->gt_keyindex[keyID] = 0;
        gtif->gt_flags |= FLAG_FILE_MODIFIED;

return 1;
    }
    else switch (type)
    {
      case TYPE_SHORT:
        /* cppcheck-suppress unreadVariable */
        sval=(pinfo_t) va_arg(ap, int);
        val=(char *)&sval;
        break;
      case TYPE_DOUBLE:
        /* cppcheck-suppress unreadVariable */
        dval=va_arg(ap, dblparam_t);
        val=(char *)&dval;
        break;
      case TYPE_ASCII:
        val=va_arg(ap, char*);
        count = (int)strlen(val) + 1; /* force = string length */
        break;
      default:
        assert( FALSE );
        break;
    }
    va_end(ap);

/* We assume here that there are no multi-valued SHORTS ! */
 if (nIndex)
 {
 /* Key already exists */
 key = gtif->gt_keys+nIndex;
 if (type!=key->gk_type || count > key->gk_count)
 {
 /* need to reset data pointer */
 key->gk_type = type;
 key->gk_count = count;
 key->gk_size = _gtiff_size[ type ];
 newvalues = 1;
 }
 }
 else
 {
 /* We need to create the key */
 if (gtif->gt_num_keys == MAX_KEYS) return 0;
 key = gtif->gt_keys + ++gtif->gt_num_keys;
 nIndex = gtif->gt_num_keys;
 gtif->gt_keyindex[ keyID ] = nIndex;
 key->gk_key = keyID;
 key->gk_type = type;
 key->gk_count = count;
 key->gk_size = _gtiff_size[ type ];
 if ((geokey_t)gtif->gt_keymin > keyID) gtif->gt_keymin=keyID;
 if ((geokey_t)gtif->gt_keymax < keyID) gtif->gt_keymax=keyID;
 newvalues = 1;
 }

if (newvalues)
    {
        switch (type)
        {
          case TYPE_SHORT:
            if (count > 1) return 0;
            data = (char *)&key->gk_data; /* store value *in* data */
            break;
          case TYPE_DOUBLE:
            key->gk_data = (char *)(gtif->gt_double + gtif->gt_ndoubles);
            data = key->gk_data;
            gtif->gt_ndoubles += count;
            break;
          case TYPE_ASCII:
            break;
          default:
            va_end(ap);
            return 0;
        }
        gtif->gt_nshorts += sizeof(KeyEntry)/sizeof(pinfo_t);
    }

/* this fixes a bug where if a request is made to write a duplicate
       key, we must initialize the data to a valid value.
       Bryan Wells (bryan@athena.bangor.autometric.com) */

else /* no new values, but still have something to write */
    {
        switch (type)
        {
          case TYPE_SHORT:
            if (count > 1) return 0;
            data = (char *)&key->gk_data; /* store value *in* data */
            break;
          case TYPE_DOUBLE:
            data = key->gk_data;
            break;
          case TYPE_ASCII:
            break;
          default:
            return 0;
        }
    }

switch (type)
    {
      case TYPE_ASCII:
        /* throw away existing data and allocate room for new data */
        if (key->gk_data != 0)
        {
            _GTIFFree(key->gk_data);
        }
        key->gk_data = (char *)_GTIFcalloc(count);
        key->gk_count = count;
        data = key->gk_data;
        break;
      default:
        break;
    }

_GTIFmemcpy(data, val, count*key->gk_size);

gtif->gt_flags |= FLAG_FILE_MODIFIED;
    return 1;
}