mitab_capi.cpp

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/**********************************************************************
 * $Id: mitab_capi.cpp,v 1.35 2004/07/08 00:00:54 dmorissette Exp $
 *
 * Name:     mitab_capi.cpp
 * Project:  MapInfo TAB Read/Write library
 * Language: C++
 * Purpose:  Simple C access API.  Suitable for limited access
 *           to MITAB from an application able to call C style DLL
 *           entry points.
 * Author:   Frank Warmerdam, [e-mail]
 *
 **********************************************************************
 * Copyright (c) 2000-2004, 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.
 **********************************************************************
 *
 * $Log: mitab_capi.cpp,v $
 * Revision 1.35  2004/07/08 00:00:54  dmorissette
 * Disabled mitab_c_get_extended_mif_coordsys_vb() until
 * mitab_c_get_extended_mif_coordsys() is re-enabled
 *
 * Revision 1.34  2004/07/07 21:51:35  dmorissette
 * Added mitab_c_get_mif_coordsys_vb() (patch from BVT)
 *
 * Revision 1.33  2004/06/30 20:05:34  dmorissette
 * Added mitab_c_load_coordsys_table() to C API (bug 469)
 *
 * Revision 1.32  2003/08/12 20:58:27  dmorissette
 * Check for nAffineFlag==1 in mitab_c_get_extended_mif_coordsys() - Anthony D.
 *
 * Revision 1.31  2003/08/12 20:20:33  dmorissette
 * Changes from Anthony Dunk, Encom:
 * - Added ability to create a feature of type TABFC_NoGeom
 * - Added mitab_c_get_feature_count(), mitab_c_get_field_as_double() and
 *   mitab_c_get_extended_mif_coordsys()
 *
 * Revision 1.30  2003/08/07 03:20:46  dmorissette
 * Added mitab_c_getlibversion() to C API. (Uffe K. - bug 21)
 *
 * Revision 1.29  2003/01/18 21:44:33  daniel
 * Added 'indexed' and 'unique' parameters to mitab_c_add_field().
 *
 * Revision 1.28  2003/01/18 20:43:31  daniel
 * Added support for writing NONE geometries via the C API
 *
 * Revision 1.27  2002/06/18 14:31:07  julien
 * Change a function name to be consistent with other function in mitab_capi
 * (mitab_c_region_isinteriorring become mitab_c_is_interior_ring)
 *
 * Revision 1.26  2002/06/17 15:00:30  julien
 * Add IsInteriorRing() function in TABRegion to validate if a ring is internal
 *
 * Revision 1.25  2002/05/21 15:28:49  daniel
 * Updated mitab_c_set_points() docs about controlling island/holes
 *
 * Revision 1.24  2002/05/16 14:12:53  julien
 * Add support for MultiPolygon in mitab_c_setpoint
 *
 * Revision 1.23  2002/05/10 20:54:56  daniel
 * Fixed crash in mitab_c_sef_font()... I was using an illegal type cast
 *
 * Revision 1.22  2002/05/08 21:37:40  daniel
 * Added FontPoint and CustomPoint in mitab_c_create_feature() and
 * mitab_c_set_points().  And (hopefully) fixed the STDCALL stuff.
 *
 * Revision 1.21  2002/05/08 20:02:03  daniel
 * Made mitab_c_set_font() and mitab_c_get_font() work for TABFC_FontPoint
 * and TABFC_CustomPoint.
 *
 * Revision 1.20  2002/05/03 15:09:14  daniel
 * Added mitab_c_get_field_width() and mitab_c_get_field_precision()
 *
 * Revision 1.19  2002/04/26 14:16:49  julien
 * Finishing the implementation of Multipoint (support for MIF)
 *
 * Revision 1.18  2002/03/26 19:27:43  daniel
 * Got rid of tabs in source
 *
 * Revision 1.17  2002/02/22 14:10:33  daniel
 * Restored mitab_c_set_arc() fix from v1.15 which had been overwritten.
 * Added a note about VB, Pascal, MapBasic in Doxygen docs introduction.
 *
 * Revision 1.16  2002/02/22 13:50:28  daniel
 * (From Bo Thomsen) New VB interface functions
 *
 * Revision 1.16  2002/02/20 12:35:00  bvt
 * Added alternative functions to fetch various strings for VB compatibility.
 * Functions has suffix _vb.
 *
 * Revision 1.15  2001/12/17 16:05:19  warmerda
 * set point geometry in mitab_c_set_arc() so validate will work
 *
 * Revision 1.14  2001/11/02 17:30:02  daniel
 * Added mitab_c_get/set_projinfo() and mitab_c_get_mif_coordsys().
 * Changed mitab_c_create() to make bounds optional and allow using default
 * projection bounds if available.
 *
 * Revision 1.13  2001/08/10 19:32:38  warmerda
 * check reference count before deleting spatial ref
 *
 * Revision 1.12  2001/07/02 20:03:28  daniel
 * Added mitab_c_get_text().
 *
 * Revision 1.11  2001/06/25 01:49:47  daniel
 * Added get methods for all pen, brush, font and symbol properties.
 *
 * Revision 1.10  2001/01/22 16:03:58  warmerda
 * expanded tabs
 *
 * Revision 1.9  2000/10/16 21:44:50  warmerda
 * added nonearth support
 *
 * Revision 1.8  2000/10/03 20:43:36  daniel
 * Added support for writing arcs,ellipses and rectangles in C API
 *
 * Revision 1.7  2000/04/21 13:37:59  daniel
 * Added doxygen file definition block
 *
 * Revision 1.6  2000/04/21 12:53:07  daniel
 * Added funcs to fetch feature coordinates and attributes + written docs
 *
 * Revision 1.5  2000/02/28 16:46:37  daniel
 * Removed style param to mitab_c_set_pen() since this param is actually
 * used inside the format to define pen width in points (version 450)
 *
 * Revision 1.4  2000/01/15 22:30:43  daniel
 * Switch to MIT/X-Consortium OpenSource license
 *
 * Revision 1.3  2000/01/14 21:58:40  warmerda
 * added error handling
 *
 * Revision 1.2  2000/01/14 16:33:24  warmerda
 * initial implementation complete
 *
 * Revision 1.1  2000/01/14 14:53:59  warmerda
 * New
 *
 */


/** \file mitab_capi.cpp
 *
 *  MITAB C API.
 *
 * The C wrapper functions contained in mitab_capi.cpp provide a much simpler
 * interface than the OGR-based C++ classes to the MITAB library to read and
 * write .TAB and .MIF files.
 *
 * To use the C API, simply #include "mitab_capi.h" and use the functions 
 * defined in mitab_capi.cpp.  
 *
 * See also mitabc_test.cpp which for examples of use of the C API.
 *
 * See contrib/README_VB.TXT in the MITAB source code distribution for
 * informations on using the MITAB C API from VB, Pascal, or MapBasic.
 *
 */

#include "mitab.h"
#include "mitab_capi.h"

static int _mitab_c_get_feature_info( mitab_feature feature, int what_info, 
                                      int *part, int *point, double *vertex );
#define INFO_NUMPARTS  0
#define INFO_NUMPOINTS 1
#define INFO_XVERTEX   2
#define INFO_YVERTEX   3


// Used in mitab_c_get_extended_mif_coordsys().
static const char sUnitsLookup[][20]=
{
    "mi",       // 0
    "km",       // 1
    "in",       // 2
    "ft",       // 3
    "yd",       // 4
    "mm",       // 5
    "cm",       // 6
    "m",        // 7
    "survey ft",// 8
    "nmi",      // 9
    "",         // 10
    "",         // 11
    "",         // 12
    "",         // 13
    "",         // 14
    "",         // 15
    "",         // 16
    "",         // 17
    "",         // 18
    "",         // 19
    "",         // 20
    "",         // 21
    "",         // 22
    "",         // 23
    "",         // 24
    "",         // 25
    "",         // 26
    "",         // 27
    "",         // 28
    "",         // 29
    "li",       // 30
    "ch",       // 31
    "rd"        // 32
};



/* ==================================================================== */
/*                   Error handling functions                           */
/* ==================================================================== */

/************************************************************************/
/*                       mitab_c_libversion()                           */
/************************************************************************/

/**
 * Returns the version of the library.
 * 
 * @return an integer representing the current version of the MITAB library
 * in the format xxxyyyzzz, e.g. returns 1002004 for v1.2.4.
 */

int MITAB_STDCALL
mitab_c_getlibversion()

{
    return MITAB_VERSION_INT;
}

/************************************************************************/
/*                       mitab_c_getlasterrorno()                       */
/************************************************************************/

/**
 * Fetch the last error number.
 *
 * This is the error number, not the error class.
 *
 * @return the error number of the last error to occur, or CPLE_None (0)
 * if there are no posted errors.
 */

int MITAB_STDCALL
mitab_c_getlasterrorno()

{
    return CPLGetLastErrorNo();
}

/************************************************************************/
/*                      mitab_c_getlasterrormsg()                       */
/************************************************************************/

/**
 * Get the last error message.
 *
 * Fetches the last error message posted with CPLError(), that hasn't
 * been cleared by CPLErrorReset().  The returned pointer is to an internal
 * string that should not be altered or freed.
 *
 * @return the last error message, or an empty string if there is no posted
 *         error message.
 */

const char * MITAB_STDCALL
mitab_c_getlasterrormsg()

{
    const char      *pszLastMessage = CPLGetLastErrorMsg();

    if( pszLastMessage == NULL )
        return "";
    else
        return pszLastMessage;
}

/************************************************************************/
/*                      mitab_c_getlasterrormsg_vb()                    */
/************************************************************************/

/**
 * Get the last error message (VB Version).
 *
 * Fetches the last error message posted with CPLError(), that hasn't
 * been cleared by CPLErrorReset().  The returned pointer is to an internal
 * string that should not be altered or freed.
 *
 * @param errormsg string buffer to return the last error message (will
 *         return an empty string if there is no posted error message).
 * @param l the maximum length of the errormessage string including 
 *         terminating null.
 * @return the length of the last error message, or zero if there is no posted
 *         error message.
 */

int MITAB_STDCALL 
mitab_c_getlasterrormsg_vb (char * errormsg, int l)

{
    strncpy (errormsg,CPLGetLastErrorMsg(),l); 
    return strlen(errormsg);
}


/* ==================================================================== */
/*                       C API Functions                                */
/* ==================================================================== */

/************************************************************************/
/*                            mitab_c_open()                            */
/************************************************************************/

/**
 * Open an existing .TAB or .MIF dataset for read access.
 *
 * The function automatically detects the format (.MIF or .TAB) of the 
 * specified file.
 *
 * Note that it is not possible to open a file for update (i.e. read+write)
 * with the current version of the library.
 *
 * @param pszFilename the complete filename (including extension .TAB or .MIF)
 *        of the file to open.
 * @return a valid mitab_handle, or NULL if the file could not be opened.
 */

mitab_handle MITAB_STDCALL
mitab_c_open( const char * pszFilename )

{
    CPLSetErrorHandler( CPLQuietErrorHandler );
    return (mitab_handle) IMapInfoFile::SmartOpen( pszFilename );
}

/************************************************************************/
/*                           mitab_c_close()                            */
/************************************************************************/

/**
 * Close a dataset previously opened using mitab_c_open() or created using
 * mitab_c_create().
 *
 * @param handle the mitab_handle of the dataset to close.
 */

void MITAB_STDCALL
mitab_c_close( mitab_handle handle )

{
    IMapInfoFile        *poFile = (IMapInfoFile *) handle;

    poFile->Close();

    delete poFile;      
}

/************************************************************************/
/*                           mitab_c_create()                           */
/************************************************************************/

/**
 * Create a new .TAB or .MIF dataset.
 *
 * Note that it is not possible to open a file for update (i.e. read+write)
 * with the current version of the library.
 *
 * @param filename the complete filename (including extension .TAB or .MIF)
 *        of the file to create.
 * @param mif_or_tab one of "mif" to create a .MIF dataset or "tab" to create
 *        a .TAB dataset.  The default is to create a TAB dataset if this
 *        parameter's value is NULL or an empty string.
 * @param mif_projection the projection to use for the dataset, in the same
 *        format that is used in the "CoordSys" line of a MIF file header.
 *        If this parameter's value is NULL or empty then a LAT/LON coordsys
 *        is assumed.  See also mitab_c_get_mif_coordsys().
 * @param north the upper dataset bound.
 *        Note that valid bounds are required for a .TAB dataset otherwise
 *        data may not be stored properly in the file.  
 *        MITAB knows the default bounds only for the most common MapInfo