dll/3rdparty/libtiff/tif_extension.c

   1 /*
   2  * Copyright (c) 1988-1997 Sam Leffler
   3  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and
   6  * its documentation for any purpose is hereby granted without fee, provided
   7  * that (i) the above copyright notices and this permission notice appear in
   8  * all copies of the software and related documentation, and (ii) the names of
   9  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  10  * publicity relating to the software without the specific, prior written
  11  * permission of Sam Leffler and Silicon Graphics.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 /*
  26  * TIFF Library.
  27  *
  28  * Various routines support external extension of the tag set, and other
  29  * application extension capabilities.
  30  */
  31
  32 #include <precomp.h>
  33
  34 int TIFFGetTagListCount( TIFF *tif )
  35
  36 {
  37     TIFFDirectory* td = &tif->tif_dir;
  38
  39     return td->td_customValueCount;
  40 }
  41
  42 uint32 TIFFGetTagListEntry( TIFF *tif, int tag_index )
  43
  44 {
  45     TIFFDirectory* td = &tif->tif_dir;
  46
  47     if( tag_index < 0 || tag_index >= td->td_customValueCount )
  48         return (uint32)(-1);
  49     else
  50         return td->td_customValues[tag_index].info->field_tag;
  51 }
  52
  53 /*
  54 ** This provides read/write access to the TIFFTagMethods within the TIFF
  55 ** structure to application code without giving access to the private
  56 ** TIFF structure.
  57 */
  58 TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif )
  59
  60 {
  61     return &(tif->tif_tagmethods);
  62 }
  63
  64 void *TIFFGetClientInfo( TIFF *tif, const char *name )
  65
  66 {
  67     TIFFClientInfoLink *psLink = tif->tif_clientinfo;
  68
  69     while( psLink != NULL && strcmp(psLink->name,name) != 0 )
  70         psLink = psLink->next;
  71
  72     if( psLink != NULL )
  73         return psLink->data;
  74     else
  75         return NULL;
  76 }
  77
  78 void TIFFSetClientInfo( TIFF *tif, void *data, const char *name )
  79
  80 {
  81     TIFFClientInfoLink *psLink = tif->tif_clientinfo;
  82
  83     /*
  84     ** Do we have an existing link with this name?  If so, just
  85     ** set it.
  86     */
  87     while( psLink != NULL && strcmp(psLink->name,name) != 0 )
  88         psLink = psLink->next;
  89
  90     if( psLink != NULL )
  91     {
  92         psLink->data = data;
  93         return;
  94     }
  95
  96     /*
  97     ** Create a new link.
  98     */
  99
 100     psLink = (TIFFClientInfoLink *) _TIFFmalloc(sizeof(TIFFClientInfoLink));
 101     assert (psLink != NULL);
 102     psLink->next = tif->tif_clientinfo;
 103     psLink->name = (char *) _TIFFmalloc((tmsize_t)(strlen(name)+1));
 104     assert (psLink->name != NULL);
 105     strcpy(psLink->name, name);
 106     psLink->data = data;
 107
 108     tif->tif_clientinfo = psLink;
 109 }
 110 /*
 111  * Local Variables:
 112  * mode: c
 113  * c-basic-offset: 8
 114  * fill-column: 78
 115  * End:
 116  */