libsmdev_support.c

/*
 * Support functions
 *
 * Copyright (c) 2010-2013, Joachim Metz <joachim.metz@gmail.com>
 *
 * Refer to AUTHORS for acknowledgements.
 *
 * This software is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this software.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <common.h>
#include <memory.h>
#include <types.h>

#if defined( HAVE_SYS_STAT_H )
#include <sys/stat.h>
#endif

#if defined( HAVE_FCNTL_H )
#include <fcntl.h>
#endif

#if defined( HAVE_UNISTD_H )
#include <unistd.h>
#endif

#if defined( HAVE_ERRNO_H ) || defined( WINAPI )
#include <errno.h>
#endif

#include "libsmdev_definitions.h"
#include "libsmdev_handle.h"
#include "libsmdev_libcerror.h"
#include "libsmdev_libcfile.h"
#include "libsmdev_libclocale.h"
#include "libsmdev_libcstring.h"
#include "libsmdev_libuna.h"
#include "libsmdev_support.h"

#if !defined( HAVE_LOCAL_LIBSMDEV )

/* Returns the library version
 */
const char *libsmdev_get_version(
             void )
{
	return( (const char *) LIBSMDEV_VERSION_STRING );
}

/* Returns the access flags for reading
 */
int libsmdev_get_access_flags_read(
     void )
{
	return( (int) LIBSMDEV_ACCESS_FLAG_READ );
}

/* Returns the access flags for reading and writing
 */
int libsmdev_get_access_flags_read_write(
     void )
{
	return( (int) ( LIBSMDEV_ACCESS_FLAG_READ | LIBSMDEV_ACCESS_FLAG_WRITE ) );
}

/* Returns the access flags for writing
 */
int libsmdev_get_access_flags_write(
     void )
{
	return( (int) LIBSMDEV_ACCESS_FLAG_WRITE );
}

/* Retrieves the narrow system string codepage
 * A value of 0 represents no codepage, UTF-8 encoding is used instead
 * Returns 1 if successful or -1 on error
 */
int libsmdev_get_codepage(
     int *codepage,
     libcerror_error_t **error )
{
	static char *function = "libsmdev_get_codepage";

	if( libclocale_codepage_get(
	     codepage,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_GET_FAILED,
		 "%s: unable to retrieve codepage.",
		 function );

		return( -1 );
	}
	return( 1 );
}

/* Sets the narrow system string codepage
 * A value of 0 represents no codepage, UTF-8 encoding is used instead
 * Returns 1 if successful or -1 on error
 */
int libsmdev_set_codepage(
     int codepage,
     libcerror_error_t **error )
{
	static char *function = "libsmdev_set_codepage";

	if( libclocale_codepage_set(
	     codepage,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_SET_FAILED,
		 "%s: unable to set codepage.",
		 function );

		return( -1 );
	}
	return( 1 );
}

#endif /* !defined( HAVE_LOCAL_LIBSMDEV ) */

/* Determines if a file is a device
 * Returns 1 if true, 0 if not or -1 on error
 */
int libsmdev_check_device(
     const char *filename,
     libcerror_error_t **error )
{
	libcfile_file_t *file = NULL;
	static char *function = "libsmdev_check_device";
	int result            = 0;

	if( filename == NULL )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
		 "%s: invalid filename.",
		 function );

		return( -1 );
	}
	if( libcfile_file_initialize(
	     &file,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,
		 "%s: unable to create file.",
		 function );

		goto on_error;
	}
	if( libcfile_file_open(
	     file,
	     filename,
	     LIBCFILE_OPEN_READ,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_IO,
		 LIBCERROR_IO_ERROR_OPEN_FAILED,
		 "%s: unable to open file.",
		 function );

		goto on_error;
	}
	result = libcfile_file_is_device(
	          file,
	          error );

	if( result == -1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_GET_FAILED,
		 "%s: unable to determine if file is a device.",
		 function );

		return( -1 );
	}
	if( libcfile_file_close(
	     file,
	     error ) != 0 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_IO,
		 LIBCERROR_IO_ERROR_CLOSE_FAILED,
		 "%s: unable to close file.",
		 function );

		goto on_error;
	}
	if( libcfile_file_free(
	     &file,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
		 "%s: unable to free file.",
		 function );

		goto on_error;
	}
	return( result );

on_error:
	if( file != NULL )
	{
		libcfile_file_free(
		 &file,
		 NULL );
	}
	return( -1 );
}

#if defined( HAVE_WIDE_CHARACTER_TYPE )

/* Determines if a file is a device
 * Returns 1 if true, 0 if not or -1 on error
 */
int libsmdev_check_device_wide(
     const wchar_t *filename,
     libcerror_error_t **error )
{
	libcfile_file_t *file = NULL;
	static char *function = "libsmdev_check_device_wide";
	int result            = 0;

	if( filename == NULL )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
		 "%s: invalid filename.",
		 function );

		return( -1 );
	}
	if( libcfile_file_initialize(
	     &file,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,
		 "%s: unable to create file.",
		 function );

		goto on_error;
	}
	if( libcfile_file_open_wide(
	     file,
	     filename,
	     LIBCFILE_OPEN_READ,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_IO,
		 LIBCERROR_IO_ERROR_OPEN_FAILED,
		 "%s: unable to open file.",
		 function );

		goto on_error;
	}
	result = libcfile_file_is_device(
	          file,
	          error );

	if( result == -1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_GET_FAILED,
		 "%s: unable to determine if file is a device.",
		 function );

		return( -1 );
	}
	if( libcfile_file_close(
	     file,
	     error ) != 0 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_IO,
		 LIBCERROR_IO_ERROR_CLOSE_FAILED,
		 "%s: unable to close file.",
		 function );

		goto on_error;
	}
	if( libcfile_file_free(
	     &file,
	     error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_RUNTIME,
		 LIBCERROR_RUNTIME_ERROR_FINALIZE_FAILED,
		 "%s: unable to free file.",
		 function );

		goto on_error;
	}
	return( result );

on_error:
	if( file != NULL )
	{
		libcfile_file_free(
		 &file,
		 NULL );
	}
	return( -1 );
}

#endif