third_party/libtiff/src/tif_extension.c

/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library.
 *
 * Various routines support external extension of the tag set, and other
 * application extension capabilities.
 */

#include "tiffiop.h"

int TIFFGetTagListCount(TIFF *tif)

{
    TIFFDirectory *td = &tif->tif_dir;

    return td->td_customValueCount;
}

uint32_t TIFFGetTagListEntry(TIFF *tif, int tag_index)

{
    TIFFDirectory *td = &tif->tif_dir;

    if (tag_index < 0 || tag_index >= td->td_customValueCount)
        return (uint32_t)(-1);
    else
        return td->td_customValues[tag_index].info->field_tag;
}

/*
** This provides read/write access to the TIFFTagMethods within the TIFF
** structure to application code without giving access to the private
** TIFF structure.
*/
TIFFTagMethods *TIFFAccessTagMethods(TIFF *tif)

{
    return &(tif->tif_tagmethods);
}

void *TIFFGetClientInfo(TIFF *tif, const char *name)

{
    TIFFClientInfoLink *psLink = tif->tif_clientinfo;

    while (psLink != NULL && strcmp(psLink->name, name) != 0)
        psLink = psLink->next;

    if (psLink != NULL)
        return psLink->data;
    else
        return NULL;
}

void TIFFSetClientInfo(TIFF *tif, void *data, const char *name)

{
    TIFFClientInfoLink *psLink = tif->tif_clientinfo;

    /*
    ** Do we have an existing link with this name?  If so, just
    ** set it.
    */
    while (psLink != NULL && strcmp(psLink->name, name) != 0)
        psLink = psLink->next;

    if (psLink != NULL)
    {
        psLink->data = data;
        return;
    }

    /*
    ** Create a new link.
    */

    psLink =
        (TIFFClientInfoLink *)_TIFFmallocExt(tif, sizeof(TIFFClientInfoLink));
    assert(psLink != NULL);
    psLink->next = tif->tif_clientinfo;
    psLink->name = (char *)_TIFFmallocExt(tif, (tmsize_t)(strlen(name) + 1));
    assert(psLink->name != NULL);
    strcpy(psLink->name, name);
    psLink->data = data;

    tif->tif_clientinfo = psLink;
}