File: ogr_srs_dict.cpp

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/******************************************************************************
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  Implement importFromDict() method to read a WKT SRS from a
 *           coordinate system dictionary in a simple text format.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2004, Frank Warmerdam
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "cpl_port.h"
#include "ogr_spatialref.h"

#include <cstring>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "ogr_core.h"
#include "ogr_srs_api.h"

CPL_CVSID("$Id: ogr_srs_dict.cpp 4942e6b19a5f82ab343ec686154644effd0fcbde 2018-04-18 21:13:03 +0200 Even Rouault $")

/************************************************************************/
/*                           importFromDict()                           */
/************************************************************************/

/**
 * Read SRS from WKT dictionary.
 *
 * This method will attempt to find the indicated coordinate system identity
 * in the indicated dictionary file.  If found, the WKT representation is
 * imported and used to initialize this OGRSpatialReference.
 *
 * More complete information on the format of the dictionary files can
 * be found in the epsg.wkt file in the GDAL data tree.  The dictionary
 * files are searched for in the "GDAL" domain using CPLFindFile().  Normally
 * this results in searching /usr/local/share/gdal or somewhere similar.
 *
 * This method is the same as the C function OSRImportFromDict().
 *
 * @param pszDictFile the name of the dictionary file to load.
 *
 * @param pszCode the code to lookup in the dictionary.
 *
 * @return OGRERR_NONE on success, or OGRERR_SRS_UNSUPPORTED if the code isn't
 * found, and OGRERR_SRS_FAILURE if something more dramatic goes wrong.
 */

OGRErr OGRSpatialReference::importFromDict( const char *pszDictFile,
                                            const char *pszCode )

{
/* -------------------------------------------------------------------- */
/*      Find and open file.                                             */
/* -------------------------------------------------------------------- */
    CPLString osDictFile(pszDictFile);
    const char *pszFilename = CPLFindFile( "gdal", pszDictFile );
    if( pszFilename == nullptr )
        return OGRERR_UNSUPPORTED_SRS;

    VSILFILE *fp = VSIFOpenL( pszFilename, "rb" );
    if( fp == nullptr )
        return OGRERR_UNSUPPORTED_SRS;

/* -------------------------------------------------------------------- */
/*      Process lines.                                                  */
/* -------------------------------------------------------------------- */
    OGRErr eErr = OGRERR_UNSUPPORTED_SRS;
    const char *pszLine = nullptr;

    while( (pszLine = CPLReadLineL(fp)) != nullptr )

    {
        if( pszLine[0] == '#' )
            continue;

        if( STARTS_WITH_CI(pszLine, "include ") )
        {
            eErr = importFromDict( pszLine + 8, pszCode );
            if( eErr != OGRERR_UNSUPPORTED_SRS )
                break;
            continue;
        }

        if( strstr(pszLine, ",") == nullptr )
            continue;

        if( EQUALN(pszLine, pszCode, strlen(pszCode))
            && pszLine[strlen(pszCode)] == ',' )
        {
            const char *pszWKT = pszLine + strlen(pszCode)+1;

            eErr = importFromWkt( pszWKT );
            if( eErr == OGRERR_NONE && osDictFile.find("esri_") == 0 )
            {
                morphFromESRI();
            }
            break;
        }
    }

/* -------------------------------------------------------------------- */
/*      Cleanup                                                         */
/* -------------------------------------------------------------------- */
    VSIFCloseL( fp );

    return eErr;
}

/************************************************************************/
/*                         OSRImportFromDict()                          */
/************************************************************************/

/**
 * Read SRS from WKT dictionary.
 *
 * This method will attempt to find the indicated coordinate system identity
 * in the indicated dictionary file.  If found, the WKT representation is
 * imported and used to initialize this OGRSpatialReference.
 *
 * More complete information on the format of the dictionary files can
 * be found in the epsg.wkt file in the GDAL data tree.  The dictionary
 * files are searched for in the "GDAL" domain using CPLFindFile().  Normally
 * this results in searching /usr/local/share/gdal or somewhere similar.
 *
 * This method is the same as the C++ method
 * OGRSpatialReference::importFromDict().
 *
 * @param hSRS spatial reference system handle.
 *
 * @param pszDictFile the name of the dictionary file to load.
 *
 * @param pszCode the code to lookup in the dictionary.
 *
 * @return OGRERR_NONE on success, or OGRERR_SRS_UNSUPPORTED if the code isn't
 * found, and OGRERR_SRS_FAILURE if something more dramatic goes wrong.
 */

OGRErr OSRImportFromDict( OGRSpatialReferenceH hSRS,
                          const char *pszDictFile,
                          const char *pszCode )

{
    VALIDATE_POINTER1( hSRS, "OSRImportFromDict", OGRERR_FAILURE );

    return reinterpret_cast<OGRSpatialReference *>(hSRS)->
        importFromDict( pszDictFile, pszCode );
}