Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  OGR
       4             :  * Purpose:  OGRNASDriver implementation
       5             :  * Author:   Frank Warmerdam, warmerdam@pobox.com
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2002, Frank Warmerdam <warmerdam@pobox.com>
       9             :  *
      10             :  * Permission is hereby granted, free of charge, to any person obtaining a
      11             :  * copy of this software and associated documentation files (the "Software"),
      12             :  * to deal in the Software without restriction, including without limitation
      13             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      14             :  * and/or sell copies of the Software, and to permit persons to whom the
      15             :  * Software is furnished to do so, subject to the following conditions:
      16             :  *
      17             :  * The above copyright notice and this permission notice shall be included
      18             :  * in all copies or substantial portions of the Software.
      19             :  *
      20             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      21             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      22             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      23             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      24             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      25             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      26             :  * DEALINGS IN THE SOFTWARE.
      27             :  ****************************************************************************/
      28             : 
      29             : #include "cpl_conv.h"
      30             : #include "cpl_multiproc.h"
      31             : #include "nasreaderp.h"
      32             : #include "ogr_nas.h"
      33             : 
      34             : /************************************************************************/
      35             : /*                     OGRNASDriverIdentify()                           */
      36             : /************************************************************************/
      37             : 
      38       45218 : static int OGRNASDriverIdentify(GDALOpenInfo *poOpenInfo)
      39             : 
      40             : {
      41       45218 :     if (poOpenInfo->fpL == nullptr)
      42       40984 :         return FALSE;
      43             : 
      44             :     /* -------------------------------------------------------------------- */
      45             :     /*      Check for a UTF-8 BOM and skip if found                         */
      46             :     /*                                                                      */
      47             :     /*      TODO: BOM is variable-length parameter and depends on encoding. */
      48             :     /*            Add BOM detection for other encodings.                    */
      49             :     /* -------------------------------------------------------------------- */
      50             : 
      51             :     // Used to skip to actual beginning of XML data
      52             :     // const char* szPtr = (const char*)poOpenInfo->pabyHeader;
      53        4234 :     const char *szPtr = reinterpret_cast<char *>(poOpenInfo->pabyHeader);
      54             : 
      55        4234 :     if (((unsigned char)szPtr[0] == 0xEF) &&
      56           6 :         ((unsigned char)szPtr[1] == 0xBB) && ((unsigned char)szPtr[2] == 0xBF))
      57             :     {
      58           6 :         szPtr += 3;
      59             :     }
      60             : 
      61             :     /* -------------------------------------------------------------------- */
      62             :     /*      Here, we expect the opening chevrons of NAS tree root element   */
      63             :     /* -------------------------------------------------------------------- */
      64        4234 :     if (szPtr[0] != '<')
      65        3584 :         return FALSE;
      66             : 
      67         650 :     if (!poOpenInfo->TryToIngest(8192))
      68           0 :         return FALSE;
      69         650 :     szPtr = (const char *)poOpenInfo->pabyHeader;
      70             : 
      71         650 :     if (strstr(szPtr, "opengis.net/gml") == nullptr)
      72         244 :         return FALSE;
      73             : 
      74         406 :     char **papszIndicators = CSLTokenizeStringComplex(
      75             :         CPLGetConfigOption("NAS_INDICATOR",
      76             :                            "NAS-Operationen;AAA-Fachschema;aaa.xsd;aaa-suite"),
      77             :         ";", 0, 0);
      78             : 
      79         406 :     bool bFound = false;
      80        2012 :     for (int i = 0; papszIndicators[i] && !bFound; i++)
      81             :     {
      82        1606 :         bFound = strstr(szPtr, papszIndicators[i]) != nullptr;
      83             :     }
      84             : 
      85         406 :     CSLDestroy(papszIndicators);
      86             : 
      87             :     // Require NAS_GFS_TEMPLATE to be defined
      88         406 :     if (bFound && !CPLGetConfigOption("NAS_GFS_TEMPLATE", nullptr))
      89             :     {
      90           0 :         CPLDebug("NAS",
      91             :                  "This file could be recognized by the NAS driver. "
      92             :                  "If this is desired, you need to define the NAS_GFS_TEMPLATE "
      93             :                  "configuration option.");
      94           0 :         return FALSE;
      95             :     }
      96             : 
      97         406 :     return bFound;
      98             : }
      99             : 
     100             : /************************************************************************/
     101             : /*                                Open()                                */
     102             : /************************************************************************/
     103             : 
     104           3 : static GDALDataset *OGRNASDriverOpen(GDALOpenInfo *poOpenInfo)
     105             : 
     106             : {
     107           3 :     if (poOpenInfo->eAccess == GA_Update || !OGRNASDriverIdentify(poOpenInfo))
     108           0 :         return nullptr;
     109             : 
     110           3 :     VSIFCloseL(poOpenInfo->fpL);
     111           3 :     poOpenInfo->fpL = nullptr;
     112             : 
     113           3 :     OGRNASDataSource *poDS = new OGRNASDataSource();
     114             : 
     115           3 :     if (!poDS->Open(poOpenInfo->pszFilename))
     116             :     {
     117           0 :         delete poDS;
     118           0 :         return nullptr;
     119             :     }
     120             : 
     121           3 :     return poDS;
     122             : }
     123             : 
     124             : /************************************************************************/
     125             : /*                           RegisterOGRNAS()                           */
     126             : /************************************************************************/
     127             : 
     128        1511 : void RegisterOGRNAS()
     129             : 
     130             : {
     131        1511 :     if (GDALGetDriverByName("NAS") != nullptr)
     132         295 :         return;
     133             : 
     134        1216 :     GDALDriver *poDriver = new GDALDriver();
     135             : 
     136        1216 :     poDriver->SetDescription("NAS");
     137        1216 :     poDriver->SetMetadataItem(GDAL_DCAP_VECTOR, "YES");
     138        1216 :     poDriver->SetMetadataItem(GDAL_DMD_LONGNAME, "NAS - ALKIS");
     139        1216 :     poDriver->SetMetadataItem(GDAL_DMD_EXTENSION, "xml");
     140        1216 :     poDriver->SetMetadataItem(GDAL_DMD_HELPTOPIC, "drivers/vector/nas.html");
     141        1216 :     poDriver->SetMetadataItem(GDAL_DCAP_VIRTUALIO, "YES");
     142        1216 :     poDriver->SetMetadataItem(GDAL_DMD_SUPPORTED_SQL_DIALECTS, "OGRSQL SQLITE");
     143             : 
     144        1216 :     poDriver->pfnOpen = OGRNASDriverOpen;
     145        1216 :     poDriver->pfnIdentify = OGRNASDriverIdentify;
     146             : 
     147        1216 :     GetGDALDriverManager()->RegisterDriver(poDriver);
     148             : }