1                 : /******************************************************************************
       2                 :  * $Id: ogrsuadatasource.cpp 23042 2011-09-04 15:07:22Z rouault $
       3                 :  *
       4                 :  * Project:  SUA Translator
       5                 :  * Purpose:  Implements OGRSUADataSource class
       6                 :  * Author:   Even Rouault, even dot rouault at mines dash paris dot org
       7                 :  *
       8                 :  ******************************************************************************
       9                 :  * Copyright (c) 2010, Even Rouault <even dot rouault at mines dash paris dot org>
      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 "ogr_sua.h"
      31                 : #include "cpl_conv.h"
      32                 : #include "cpl_string.h"
      33                 : 
      34                 : CPL_CVSID("$Id: ogrsuadatasource.cpp 23042 2011-09-04 15:07:22Z rouault $");
      35                 : 
      36                 : /************************************************************************/
      37                 : /*                          OGRSUADataSource()                          */
      38                 : /************************************************************************/
      39                 : 
      40             232 : OGRSUADataSource::OGRSUADataSource()
      41                 : 
      42                 : {
      43             232 :     papoLayers = NULL;
      44             232 :     nLayers = 0;
      45                 : 
      46             232 :     pszName = NULL;
      47             232 : }
      48                 : 
      49                 : /************************************************************************/
      50                 : /*                         ~OGRSUADataSource()                          */
      51                 : /************************************************************************/
      52                 : 
      53             232 : OGRSUADataSource::~OGRSUADataSource()
      54                 : 
      55                 : {
      56             234 :     for( int i = 0; i < nLayers; i++ )
      57               2 :         delete papoLayers[i];
      58             232 :     CPLFree( papoLayers );
      59                 : 
      60             232 :     CPLFree( pszName );
      61             232 : }
      62                 : 
      63                 : /************************************************************************/
      64                 : /*                           TestCapability()                           */
      65                 : /************************************************************************/
      66                 : 
      67               0 : int OGRSUADataSource::TestCapability( const char * pszCap )
      68                 : 
      69                 : {
      70               0 :     return FALSE;
      71                 : }
      72                 : 
      73                 : /************************************************************************/
      74                 : /*                              GetLayer()                              */
      75                 : /************************************************************************/
      76                 : 
      77               2 : OGRLayer *OGRSUADataSource::GetLayer( int iLayer )
      78                 : 
      79                 : {
      80               2 :     if( iLayer < 0 || iLayer >= nLayers )
      81               0 :         return NULL;
      82                 :     else
      83               2 :         return papoLayers[iLayer];
      84                 : }
      85                 : 
      86                 : /************************************************************************/
      87                 : /*                                Open()                                */
      88                 : /************************************************************************/
      89                 : 
      90             232 : int OGRSUADataSource::Open( const char * pszFilename, int bUpdateIn)
      91                 : 
      92                 : {
      93             232 :     if (bUpdateIn)
      94                 :     {
      95              26 :         return FALSE;
      96                 :     }
      97                 : 
      98             206 :     pszName = CPLStrdup( pszFilename );
      99                 : 
     100                 : // -------------------------------------------------------------------- 
     101                 : //      Does this appear to be a .sua file?
     102                 : // --------------------------------------------------------------------
     103                 : 
     104             206 :     VSILFILE* fp = VSIFOpenL(pszFilename, "rb");
     105             206 :     if (fp == NULL)
     106              78 :         return FALSE;
     107                 : 
     108                 :     char szBuffer[10000];
     109             128 :     int nbRead = (int)VSIFReadL(szBuffer, 1, sizeof(szBuffer) - 1, fp);
     110             128 :     szBuffer[nbRead] = '\0';
     111                 : 
     112                 :     int bIsSUA = (strstr(szBuffer, "\nTYPE=") != NULL &&
     113                 :                   strstr(szBuffer, "\nTITLE=") != NULL &&
     114                 :                   (strstr(szBuffer, "\nPOINT=") != NULL ||
     115             128 :                    strstr(szBuffer, "\nCIRCLE ") != NULL));
     116                 : 
     117             128 :     if (bIsSUA)
     118                 :     {
     119               2 :         VSIFSeekL( fp, 0, SEEK_SET );
     120               2 :         nLayers = 1;
     121               2 :         papoLayers = (OGRLayer**) CPLMalloc(sizeof(OGRLayer*));
     122               2 :         papoLayers[0] = new OGRSUALayer(fp);
     123                 :     }
     124                 :     else
     125             126 :         VSIFCloseL(fp);
     126                 : 
     127             128 :     return bIsSUA;
     128                 : }