Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  GIF Driver
       4             :  * Purpose:  Implement GDAL GIF Support using libungif code.
       5             :  * Author:   Frank Warmerdam, warmerdam@pobox.com
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2001, Frank Warmerdam
       9             :  * Copyright (c) 2007-2012, Even Rouault <even dot rouault at spatialys.com>
      10             :  *
      11             :  * Permission is hereby granted, free of charge, to any person obtaining a
      12             :  * copy of this software and associated documentation files (the "Software"),
      13             :  * to deal in the Software without restriction, including without limitation
      14             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      15             :  * and/or sell copies of the Software, and to permit persons to whom the
      16             :  * Software is furnished to do so, subject to the following conditions:
      17             :  *
      18             :  * The above copyright notice and this permission notice shall be included
      19             :  * in all copies or substantial portions of the Software.
      20             :  *
      21             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      22             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      23             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      24             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      25             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      26             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      27             :  * DEALINGS IN THE SOFTWARE.
      28             :  ****************************************************************************/
      29             : 
      30             : #include "gifdrivercore.h"
      31             : 
      32             : /************************************************************************/
      33             : /*                     GIFDriverIdentify()                              */
      34             : /************************************************************************/
      35             : 
      36       98203 : int GIFDriverIdentify(GDALOpenInfo *poOpenInfo)
      37             : 
      38             : {
      39       98203 :     if (poOpenInfo->nHeaderBytes < 8 || !poOpenInfo->fpL)
      40       91263 :         return FALSE;
      41             : 
      42       13828 :     return (memcmp(poOpenInfo->pabyHeader, "GIF87a", 6) == 0 ||
      43       13828 :             memcmp(poOpenInfo->pabyHeader, "GIF89a", 6) == 0);
      44             : }
      45             : 
      46             : /************************************************************************/
      47             : /*                      BIGGIFDriverSetCommonMetadata()                 */
      48             : /************************************************************************/
      49             : 
      50        1236 : void BIGGIFDriverSetCommonMetadata(GDALDriver *poDriver)
      51             : {
      52        1236 :     poDriver->SetDescription(BIGGIF_DRIVER_NAME);
      53        1236 :     poDriver->SetMetadataItem(GDAL_DCAP_RASTER, "YES");
      54        1236 :     poDriver->SetMetadataItem(GDAL_DMD_LONGNAME,
      55        1236 :                               "Graphics Interchange Format (.gif)");
      56        1236 :     poDriver->SetMetadataItem(GDAL_DMD_HELPTOPIC, "drivers/raster/gif.html");
      57        1236 :     poDriver->SetMetadataItem(GDAL_DMD_EXTENSION, "gif");
      58        1236 :     poDriver->SetMetadataItem(GDAL_DMD_MIMETYPE, "image/gif");
      59        1236 :     poDriver->SetMetadataItem(GDAL_DCAP_VIRTUALIO, "YES");
      60             : 
      61        1236 :     poDriver->pfnIdentify = GIFDriverIdentify;
      62        1236 :     poDriver->SetMetadataItem(GDAL_DCAP_OPEN, "YES");
      63        1236 : }
      64             : 
      65             : /************************************************************************/
      66             : /*                      GIFDriverSetCommonMetadata()                    */
      67             : /************************************************************************/
      68             : 
      69        1236 : void GIFDriverSetCommonMetadata(GDALDriver *poDriver)
      70             : {
      71        1236 :     poDriver->SetDescription(GIF_DRIVER_NAME);
      72        1236 :     poDriver->SetMetadataItem(GDAL_DCAP_RASTER, "YES");
      73        1236 :     poDriver->SetMetadataItem(GDAL_DMD_LONGNAME,
      74        1236 :                               "Graphics Interchange Format (.gif)");
      75        1236 :     poDriver->SetMetadataItem(GDAL_DMD_HELPTOPIC, "drivers/raster/gif.html");
      76        1236 :     poDriver->SetMetadataItem(GDAL_DMD_EXTENSION, "gif");
      77        1236 :     poDriver->SetMetadataItem(GDAL_DMD_MIMETYPE, "image/gif");
      78        1236 :     poDriver->SetMetadataItem(GDAL_DMD_CREATIONDATATYPES, "Byte");
      79             : 
      80        1236 :     poDriver->SetMetadataItem(GDAL_DMD_CREATIONOPTIONLIST,
      81             :                               "<CreationOptionList>\n"
      82             :                               "   <Option name='INTERLACING' type='boolean'/>\n"
      83             :                               "   <Option name='WORLDFILE' type='boolean'/>\n"
      84        1236 :                               "</CreationOptionList>\n");
      85             : 
      86        1236 :     poDriver->SetMetadataItem(GDAL_DCAP_VIRTUALIO, "YES");
      87             : 
      88        1236 :     poDriver->pfnIdentify = GIFDriverIdentify;
      89        1236 :     poDriver->SetMetadataItem(GDAL_DCAP_OPEN, "YES");
      90        1236 :     poDriver->SetMetadataItem(GDAL_DCAP_CREATECOPY, "YES");
      91        1236 : }
      92             : 
      93             : /************************************************************************/
      94             : /*                     DeclareDeferredGIFPlugin()                       */
      95             : /************************************************************************/
      96             : 
      97             : #ifdef PLUGIN_FILENAME
      98        1520 : void DeclareDeferredGIFPlugin()
      99             : {
     100        1520 :     if (GDALGetDriverByName(GIF_DRIVER_NAME) != nullptr)
     101             :     {
     102         301 :         return;
     103             :     }
     104             :     {
     105        1219 :         auto poDriver = new GDALPluginDriverProxy(PLUGIN_FILENAME);
     106             : #ifdef PLUGIN_INSTALLATION_MESSAGE
     107             :         poDriver->SetMetadataItem(GDAL_DMD_PLUGIN_INSTALLATION_MESSAGE,
     108             :                                   PLUGIN_INSTALLATION_MESSAGE);
     109             : #endif
     110        1219 :         GIFDriverSetCommonMetadata(poDriver);
     111        1219 :         GetGDALDriverManager()->DeclareDeferredPluginDriver(poDriver);
     112             :     }
     113             :     {
     114        1219 :         auto poDriver = new GDALPluginDriverProxy(PLUGIN_FILENAME);
     115             : #ifdef PLUGIN_INSTALLATION_MESSAGE
     116             :         poDriver->SetMetadataItem(GDAL_DMD_PLUGIN_INSTALLATION_MESSAGE,
     117             :                                   PLUGIN_INSTALLATION_MESSAGE);
     118             : #endif
     119        1219 :         BIGGIFDriverSetCommonMetadata(poDriver);
     120        1219 :         GetGDALDriverManager()->DeclareDeferredPluginDriver(poDriver);
     121             :     }
     122             : }
     123             : #endif