| 1 | /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_extension.c,v 1.4 2004/10/02 13:29:41 dron Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1988-1997 Sam Leffler
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| 5 | * Copyright (c) 1991-1997 Silicon Graphics, Inc.
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| 6 | *
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| 7 | * Permission to use, copy, modify, distribute, and sell this software and
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| 8 | * its documentation for any purpose is hereby granted without fee, provided
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| 9 | * that (i) the above copyright notices and this permission notice appear in
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| 10 | * all copies of the software and related documentation, and (ii) the names of
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| 11 | * Sam Leffler and Silicon Graphics may not be used in any advertising or
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| 12 | * publicity relating to the software without the specific, prior written
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| 13 | * permission of Sam Leffler and Silicon Graphics.
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| 14 | *
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| 15 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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| 16 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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| 17 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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| 18 | *
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| 19 | * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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| 20 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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| 21 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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| 22 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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| 23 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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| 24 | * OF THIS SOFTWARE.
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| 25 | */
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| 26 |
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| 27 | /*
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| 28 | * TIFF Library.
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| 29 | *
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| 30 | * Various routines support external extension of the tag set, and other
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| 31 | * application extension capabilities.
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| 32 | */
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| 33 |
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| 34 | #include "tiffiop.h"
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| 35 |
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| 36 | int TIFFGetTagListCount( TIFF *tif )
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| 37 |
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| 38 | {
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| 39 | TIFFDirectory* td = &tif->tif_dir;
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| 40 |
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| 41 | return td->td_customValueCount;
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| 42 | }
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| 43 |
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| 44 | ttag_t TIFFGetTagListEntry( TIFF *tif, int tag_index )
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| 45 |
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| 46 | {
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| 47 | TIFFDirectory* td = &tif->tif_dir;
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| 48 |
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| 49 | if( tag_index < 0 || tag_index >= td->td_customValueCount )
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| 50 | return (ttag_t) -1;
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| 51 | else
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| 52 | return td->td_customValues[tag_index].info->field_tag;
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| 53 | }
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| 54 |
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| 55 | /*
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| 56 | ** This provides read/write access to the TIFFTagMethods within the TIFF
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| 57 | ** structure to application code without giving access to the private
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| 58 | ** TIFF structure.
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| 59 | */
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| 60 | TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif )
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| 61 |
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| 62 | {
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| 63 | return &(tif->tif_tagmethods);
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| 64 | }
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| 65 |
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| 66 | void *TIFFGetClientInfo( TIFF *tif, const char *name )
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| 67 |
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| 68 | {
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| 69 | TIFFClientInfoLink *link = tif->tif_clientinfo;
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| 70 |
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| 71 | while( link != NULL && strcmp(link->name,name) != 0 )
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| 72 | link = link->next;
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| 73 |
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| 74 | if( link != NULL )
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| 75 | return link->data;
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| 76 | else
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| 77 | return NULL;
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| 78 | }
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| 79 |
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| 80 | void TIFFSetClientInfo( TIFF *tif, void *data, const char *name )
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| 81 |
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| 82 | {
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| 83 | TIFFClientInfoLink *link = tif->tif_clientinfo;
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| 84 |
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| 85 | /*
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| 86 | ** Do we have an existing link with this name? If so, just
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| 87 | ** set it.
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| 88 | */
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| 89 | while( link != NULL && strcmp(link->name,name) != 0 )
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| 90 | link = link->next;
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| 91 |
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| 92 | if( link != NULL )
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| 93 | {
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| 94 | link->data = data;
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| 95 | return;
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| 96 | }
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| 97 |
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| 98 | /*
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| 99 | ** Create a new link.
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| 100 | */
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| 101 |
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| 102 | link = (TIFFClientInfoLink *) _TIFFmalloc(sizeof(TIFFClientInfoLink));
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| 103 | assert (link != NULL);
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| 104 | link->next = tif->tif_clientinfo;
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| 105 | link->name = (char *) _TIFFmalloc(strlen(name)+1);
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| 106 | assert (link->name != NULL);
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| 107 | strcpy(link->name, name);
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| 108 | link->data = data;
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| 109 |
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| 110 | tif->tif_clientinfo = link;
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| 111 | }
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