Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  TIGER/Line Translator
       4             :  * Purpose:  Implements TigerAltName, providing access to RT4 files.
       5             :  * Author:   Frank Warmerdam, warmerdam@pobox.com
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 1999, Frank Warmerdam
       9             :  *
      10             :  * SPDX-License-Identifier: MIT
      11             :  ****************************************************************************/
      12             : 
      13             : #include "ogr_tiger.h"
      14             : #include "cpl_conv.h"
      15             : 
      16             : #include <cinttypes>
      17             : 
      18             : static const char FOUR_FILE_CODE[] = "4";
      19             : 
      20             : static const TigerFieldInfo rt4_fields[] = {
      21             :     // fieldname    fmt  type  OFTType         beg  end  len  bDefine bSet
      22             :     {"MODULE", ' ', ' ', OFTString, 0, 0, 8, 1, 0},
      23             :     {"TLID", 'R', 'N', OFTInteger, 6, 15, 10, 1, 1},
      24             :     {"RTSQ", 'R', 'N', OFTInteger, 16, 18, 3, 1, 1},
      25             :     {"FEAT", ' ', ' ', OFTIntegerList, 0, 0, 8, 1, 0}
      26             :     // Note: we don't mention the FEAT1, FEAT2, FEAT3, FEAT4, FEAT5 fields
      27             :     // here because they're handled separately in the code below; they
      28             :     // correspond
      29             :     // to the FEAT array field here.
      30             : };
      31             : 
      32             : static const TigerRecordInfo rt4_info = {
      33             :     rt4_fields, sizeof(rt4_fields) / sizeof(TigerFieldInfo), 58};
      34             : 
      35             : /************************************************************************/
      36             : /*                            TigerAltName()                            */
      37             : /************************************************************************/
      38             : 
      39           0 : TigerAltName::TigerAltName(OGRTigerDataSource *poDSIn,
      40           0 :                            CPL_UNUSED const char *pszPrototypeModule)
      41           0 :     : TigerFileBase(&rt4_info, FOUR_FILE_CODE)
      42             : {
      43           0 :     OGRFieldDefn oField("", OFTInteger);
      44             : 
      45           0 :     poDS = poDSIn;
      46           0 :     poFeatureDefn = new OGRFeatureDefn("AltName");
      47           0 :     poFeatureDefn->Reference();
      48           0 :     poFeatureDefn->SetGeomType(wkbNone);
      49             : 
      50             :     /* -------------------------------------------------------------------- */
      51             :     /*      Fields from type 4 record.                                      */
      52             :     /* -------------------------------------------------------------------- */
      53             : 
      54           0 :     AddFieldDefns(psRTInfo, poFeatureDefn);
      55           0 : }
      56             : 
      57             : /************************************************************************/
      58             : /*                             GetFeature()                             */
      59             : /************************************************************************/
      60             : 
      61           0 : OGRFeature *TigerAltName::GetFeature(int nRecordId)
      62             : 
      63             : {
      64             :     char achRecord[OGR_TIGER_RECBUF_LEN];
      65             : 
      66           0 :     if (nRecordId < 0 || nRecordId >= nFeatures)
      67             :     {
      68           0 :         CPLError(CE_Failure, CPLE_FileIO,
      69             :                  "Request for out-of-range feature %d of %s4", nRecordId,
      70             :                  pszModule);
      71           0 :         return nullptr;
      72             :     }
      73             : 
      74             :     /* -------------------------------------------------------------------- */
      75             :     /*      Read the raw record data from the file.                         */
      76             :     /* -------------------------------------------------------------------- */
      77           0 :     if (fpPrimary == nullptr)
      78           0 :         return nullptr;
      79             : 
      80           0 :     const auto nOffset = static_cast<uint64_t>(nRecordId) * nRecordLength;
      81           0 :     if (VSIFSeekL(fpPrimary, nOffset, SEEK_SET) != 0)
      82             :     {
      83           0 :         CPLError(CE_Failure, CPLE_FileIO,
      84             :                  "Failed to seek to %" PRIu64 " of %s4", nOffset, pszModule);
      85           0 :         return nullptr;
      86             :     }
      87             : 
      88             :     // Overflow cannot happen since psRTInfo->nRecordLength is unsigned
      89             :     // char and sizeof(achRecord) == OGR_TIGER_RECBUF_LEN > 255
      90           0 :     if (VSIFReadL(achRecord, psRTInfo->nRecordLength, 1, fpPrimary) != 1)
      91             :     {
      92           0 :         CPLError(CE_Failure, CPLE_FileIO, "Failed to read record %d of %s4",
      93             :                  nRecordId, pszModule);
      94           0 :         return nullptr;
      95             :     }
      96             : 
      97             :     /* -------------------------------------------------------------------- */
      98             :     /*      Set fields.                                                     */
      99             :     /* -------------------------------------------------------------------- */
     100             : 
     101           0 :     OGRFeature *poFeature = new OGRFeature(poFeatureDefn);
     102           0 :     int anFeatList[5] = {0};
     103           0 :     int nFeatCount = 0;
     104             : 
     105           0 :     SetFields(psRTInfo, poFeature, achRecord);
     106             : 
     107           0 :     for (int iFeat = 0; iFeat < 5; iFeat++)
     108             :     {
     109             :         const char *pszFieldText =
     110           0 :             GetField(achRecord, 19 + iFeat * 8, 26 + iFeat * 8);
     111             : 
     112           0 :         if (*pszFieldText != '\0')
     113           0 :             anFeatList[nFeatCount++] = atoi(pszFieldText);
     114             :     }
     115             : 
     116           0 :     poFeature->SetField("FEAT", nFeatCount, anFeatList);
     117             : 
     118           0 :     return poFeature;
     119             : }