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/******************************************************************************
*
* Purpose: Implementation of the Open() function.
*
******************************************************************************
* Copyright (c) 2009
* PCI Geomatics, 50 West Wilmot Street, Richmond Hill, Ont, Canada
*
* 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 "pcidsk.h"
#include "pcidsk_config.h"
#include "pcidsk_types.h"
#include "pcidsk_file.h"
#include "pcidsk_interfaces.h"
#include "core/cpcidskfile.h"
#include <string>
#include <cstring>
#include <cassert>
using namespace PCIDSK;
/************************************************************************/
/* Open() */
/************************************************************************/
/**
* Open a PCIDSK (.pix) file.
*
* This function attempts to open the named file, with the indicated
* access and the provided set of system interface methods.
*
* @param filename the name of the PCIDSK file to access.
* @param access either "r" for read-only, or "r+" for read-write access.
* @param interfaces Either NULL to use default interfaces, or a pointer
* to a populated interfaces object.
*
* @return a pointer to a file object for accessing the PCIDSK file.
*/
PCIDSKFile *PCIDSK::Open( std::string filename, std::string access,
const PCIDSKInterfaces *interfaces )
{
/* -------------------------------------------------------------------- */
/* Use default interfaces if none are passed in. */
/* -------------------------------------------------------------------- */
PCIDSKInterfaces default_interfaces;
if( interfaces == NULL )
interfaces = &default_interfaces;
/* -------------------------------------------------------------------- */
/* First open the file, and confirm that it is PCIDSK before */
/* going further. */
/* -------------------------------------------------------------------- */
void *io_handle = interfaces->io->Open( filename, access );
assert( io_handle != NULL );
char header_check[6];
if( interfaces->io->Read( header_check, 1, 6, io_handle ) != 6
|| memcmp(header_check,"PCIDSK",6) != 0 )
{
interfaces->io->Close( io_handle );
ThrowPCIDSKException( "File %s does not appear to be PCIDSK format.",
filename.c_str() );
}
/* -------------------------------------------------------------------- */
/* Create the PCIDSKFile object. */
/* -------------------------------------------------------------------- */
CPCIDSKFile *file = new CPCIDSKFile( filename );
file->interfaces = *interfaces;
file->io_handle = io_handle;
file->io_mutex = interfaces->CreateMutex();
if( strstr(access.c_str(),"+") != NULL )
file->updatable = true;
/* -------------------------------------------------------------------- */
/* Initialize it from the header. */
/* -------------------------------------------------------------------- */
try
{
file->InitializeFromHeader();
}
catch(...)
{
delete file;
throw;
}
return file;
}
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