1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
|
/**********************************************************************
*
* geo_new.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.
*
* 20 June, 1995 Niles D. Ritter New
* 7 July, 1995 Greg Martin Fix index
*
* $Log: geo_new.c,v $
* Revision 1.14 2008/05/09 18:37:46 fwarmerdam
* add support for simple tags api
*
* Revision 1.13 2007/10/03 04:08:03 fwarmerdam
* avoid memory leak in case of error
*
* Revision 1.12 2006/06/26 20:03:37 fwarmerdam
* If the ascii parameters list is too short for the declared size
* of an ascii parameter, but it doesn't start off the end of the
* available string then just trim the length. This is to make the
* ESRI sample data file 34105h2.tif work properly. I wish we had
* a way of issuing warnings!
*
* Revision 1.11 2004/04/27 21:32:08 warmerda
* Allow GTIFNew(NULL) to work
*
* Revision 1.10 2003/09/02 13:52:17 warmerda
* various hacks to support improperly terminated asciiparms
*
* Revision 1.9 2003/06/19 20:04:11 warmerda
* fix memory underwrite if ascii parameter string is zero length
*
* Revision 1.8 2003/06/05 14:20:45 warmerda
* cosmetic formatting changes
*
**********************************************************************/
#include "geotiffio.h" /* public interface */
#include "geo_tiffp.h" /* external TIFF interface */
#include "geo_keyp.h" /* private interface */
#include "geo_simpletags.h"
/* private local routines */
static int ReadKey(GTIF* gt, TempKeyData* tempData,
KeyEntry* entptr, GeoKey* keyptr);
/**********************************************************************
*
* Public Routines
*
**********************************************************************/
/**
* Given an open TIFF file, look for GTIF keys and
* values and return GTIF structure.
This function creates a GeoTIFF information interpretation handle
(GTIF *) based on a passed in TIFF handle originally from
XTIFFOpen(). Even though the argument
(<b>tif</b>) is shown as type <tt>void *</tt>, it is really normally
of type <tt>TIFF *</tt>.<p>
The returned GTIF handle can be used to read or write GeoTIFF tags
using the various GTIF functions. The handle should be destroyed using
GTIFFree() before the file is closed with TIFFClose().<p>
If the file accessed has no GeoTIFF keys, an valid (but empty) GTIF is
still returned. GTIFNew() is used both for existing files being read, and
for new TIFF files that will have GeoTIFF tags written to them.<p>
*/
GTIF* GTIFNew(void *tif)
{
TIFFMethod default_methods;
_GTIFSetDefaultTIFF( &default_methods );
return GTIFNewWithMethods( tif, &default_methods );
}
GTIF *GTIFNewSimpleTags( void *tif )
{
TIFFMethod default_methods;
GTIFSetSimpleTagsMethods( &default_methods );
return GTIFNewWithMethods( tif, &default_methods );
}
/************************************************************************/
/* GTIFNewWithMethods() */
/* */
/* Create a new geotiff, passing in the methods structure to */
/* support not libtiff implementations without replacing the */
/* default methods. */
/************************************************************************/
GTIF* GTIFNewWithMethods(void *tif, TIFFMethod* methods)
{
GTIF* gt=(GTIF*)0;
int count,bufcount,index;
GeoKey *keyptr;
pinfo_t *data;
KeyEntry *entptr;
KeyHeader *header;
TempKeyData tempData;
memset( &tempData, 0, sizeof(tempData) );
gt = (GTIF*)_GTIFcalloc( sizeof(GTIF));
if (!gt) goto failure;
/* install TIFF file and I/O methods */
gt->gt_tif = (tiff_t *)tif;
memcpy( >->gt_methods, methods, sizeof(TIFFMethod) );
/* since this is an array, GTIF will allocate the memory */
if ( tif == NULL
|| !(gt->gt_methods.get)(tif, GTIFF_GEOKEYDIRECTORY, >->gt_nshorts, &data ))
{
/* No ProjectionInfo, create a blank one */
data=(pinfo_t*)_GTIFcalloc((4+MAX_VALUES)*sizeof(pinfo_t));
if (!data) goto failure;
header = (KeyHeader *)data;
header->hdr_version = GvCurrentVersion;
header->hdr_rev_major = GvCurrentRevision;
header->hdr_rev_minor = GvCurrentMinorRev;
gt->gt_nshorts=sizeof(KeyHeader)/sizeof(pinfo_t);
}
gt->gt_short = data;
header = (KeyHeader *)data;
if (header->hdr_version > GvCurrentVersion) goto failure;
if (header->hdr_rev_major > GvCurrentRevision)
{
/* issue warning */
}
/* If we got here, then the geokey can be parsed */
count = header->hdr_num_keys;
gt->gt_num_keys = count;
gt->gt_version = header->hdr_version;
gt->gt_rev_major = header->hdr_rev_major;
gt->gt_rev_minor = header->hdr_rev_minor;
bufcount = count+MAX_KEYS; /* allow for expansion */
/* Get the PARAMS Tags, if any */
if (tif == NULL
|| !(gt->gt_methods.get)(tif, GTIFF_DOUBLEPARAMS,
>->gt_ndoubles, >->gt_double ))
{
gt->gt_double=(double*)_GTIFcalloc(MAX_VALUES*sizeof(double));
if (!gt->gt_double) goto failure;
}
if ( tif == NULL
|| !(gt->gt_methods.get)(tif, GTIFF_ASCIIPARAMS,
&tempData.tk_asciiParamsLength,
&tempData.tk_asciiParams ))
{
tempData.tk_asciiParams = 0;
tempData.tk_asciiParamsLength = 0;
}
else
{
/* last NULL doesn't count; "|" used for delimiter */
--tempData.tk_asciiParamsLength;
}
/* allocate space for GeoKey array and its index */
gt->gt_keys = (GeoKey *)_GTIFcalloc( sizeof(GeoKey)*bufcount);
if (!gt->gt_keys) goto failure;
gt->gt_keyindex = (int *)_GTIFcalloc( sizeof(int)*(MAX_KEYINDEX+1));
if (!gt->gt_keyindex) goto failure;
/* Loop to get all GeoKeys */
entptr = ((KeyEntry *)data) + 1;
keyptr = gt->gt_keys;
gt->gt_keymin = MAX_KEYINDEX;
gt->gt_keymax = 0;
for (index=1; index<=count; index++,entptr++)
{
if (!ReadKey(gt, &tempData, entptr, ++keyptr))
goto failure;
/* Set up the index (start at 1, since 0=unset) */
gt->gt_keyindex[entptr->ent_key] = index;
}
if( tempData.tk_asciiParams != NULL )
_GTIFFree( tempData.tk_asciiParams );
return gt;
failure:
/* Notify of error */
if( tempData.tk_asciiParams != NULL )
_GTIFFree( tempData.tk_asciiParams );
GTIFFree (gt);
return (GTIF *)0;
}
/**********************************************************************
*
* Private Routines
*
**********************************************************************/
/*
* Given KeyEntry, read in the GeoKey value location and set up
* the Key structure, returning 0 if failure.
*/
static int ReadKey(GTIF* gt, TempKeyData* tempData,
KeyEntry* entptr, GeoKey* keyptr)
{
int offset,count;
keyptr->gk_key = entptr->ent_key;
keyptr->gk_count = entptr->ent_count;
count = entptr->ent_count;
offset = entptr->ent_val_offset;
if (gt->gt_keymin > keyptr->gk_key) gt->gt_keymin=keyptr->gk_key;
if (gt->gt_keymax < keyptr->gk_key) gt->gt_keymax=keyptr->gk_key;
if (entptr->ent_location)
keyptr->gk_type = (gt->gt_methods.type)(gt->gt_tif,entptr->ent_location);
else
keyptr->gk_type = (gt->gt_methods.type)(gt->gt_tif,GTIFF_GEOKEYDIRECTORY);
switch (entptr->ent_location)
{
case GTIFF_LOCAL:
/* store value into data value */
*(pinfo_t *)(&keyptr->gk_data) = entptr->ent_val_offset;
break;
case GTIFF_GEOKEYDIRECTORY:
keyptr->gk_data = (char *)(gt->gt_short+offset);
if (gt->gt_nshorts < offset+count)
gt->gt_nshorts = offset+count;
break;
case GTIFF_DOUBLEPARAMS:
keyptr->gk_data = (char *)(gt->gt_double+offset);
if (gt->gt_ndoubles < offset+count)
gt->gt_ndoubles = offset+count;
break;
case GTIFF_ASCIIPARAMS:
if( offset + count == tempData->tk_asciiParamsLength + 1
&& count > 0 )
{
/* some vendors seem to feel they should not use the
terminating '|' char, but do include a terminating '\0'
which we lose in the low level reading code.
If this is the case, drop the extra character */
count--;
}
else if (offset < tempData->tk_asciiParamsLength
&& offset + count > tempData->tk_asciiParamsLength )
{
count = tempData->tk_asciiParamsLength - offset;
/* issue warning... if we could */
}
else if (offset + count > tempData->tk_asciiParamsLength)
return (0);
keyptr->gk_data = (char *) _GTIFcalloc (MAX(1,count+1));
_GTIFmemcpy (keyptr->gk_data,
tempData->tk_asciiParams + offset, count);
if( keyptr->gk_data[MAX(0,count-1)] == '|' )
keyptr->gk_data[MAX(0,count-1)] = '\0';
else
keyptr->gk_data[MAX(0,count)] = '\0';
break;
default:
return 0; /* failure */
}
keyptr->gk_size = _gtiff_size[keyptr->gk_type];
return 1; /* success */
}
|