/*
 * Library seek testing program
 *
 * Copyright (C) 2011-2016, 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>

#if defined( HAVE_STDLIB_H ) || defined( WINAPI )
#include <stdlib.h>
#endif

#include <stdio.h>

#include "vshadow_test_libcstring.h"
#include "vshadow_test_libvshadow.h"

/* Define to make vshadow_test_seek generate verbose output
#define VSHADOW_TEST_SEEK_VERBOSE
 */

/* Tests libvshadow_store_seek_offset
 * Returns 1 if successful, 0 if not or -1 on error
 */
int vshadow_test_seek_offset(
     libvshadow_store_t *store,
     off64_t input_offset,
     int input_whence,
     off64_t output_offset )
{
	libvshadow_error_t *error = NULL;
	const char *whence_string = NULL;
	off64_t result_offset     = 0;
	int result                = 0;

	if( store == NULL )
	{
		return( -1 );
	}
	if( input_whence == SEEK_CUR )
	{
		whence_string = "SEEK_CUR";
	}
	else if( input_whence == SEEK_END )
	{
		whence_string = "SEEK_END";
	}
	else if( input_whence == SEEK_SET )
	{
		whence_string = "SEEK_SET";
	}
	else
	{
		whence_string = "UNKNOWN";
	}
	fprintf(
	 stdout,
	 "Testing seek of offset: %" PRIi64 " and whence: %s\t",
	 input_offset,
	 whence_string );

	result_offset = libvshadow_store_seek_offset(
	                 store,
	                 input_offset,
	                 input_whence,
	                 &error );

	if( result_offset == output_offset )
	{
		result = 1;
	}
	if( result != 0 )
	{
		fprintf(
		 stdout,
		 "(PASS)" );
	}
	else
	{
		fprintf(
		 stdout,
		 "(FAIL)" );
	}
	fprintf(
	 stdout,
	 "\n" );

	if( error != NULL)
	{
		if( result != 1 )
		{
			libvshadow_error_backtrace_fprint(
			 error,
			 stderr );
		}
		libvshadow_error_free(
		 &error );
	}
	return( result );
}

/* The main program
 */
#if defined( LIBCSTRING_HAVE_WIDE_SYSTEM_CHARACTER )
int wmain( int argc, wchar_t * const argv[] )
#else
int main( int argc, char * const argv[] )
#endif
{
	libvshadow_error_t *error   = NULL;
	libvshadow_store_t *store   = NULL;
	libvshadow_volume_t *volume = NULL;
	size64_t volume_size        = 0;
	int number_of_stores        = 0;
	int store_index             = 0;

	if( argc < 2 )
	{
		fprintf(
		 stderr,
		 "Missing filename.\n" );

		return( EXIT_FAILURE );
	}
#if defined( HAVE_DEBUG_OUTPUT ) && defined( VSHADOW_TEST_SEEK_VERBOSE )
	libvshadow_notify_set_verbose(
	 1 );
	libvshadow_notify_set_stream(
	 stderr,
	 NULL );
#endif
	/* Initialization
	 */
	if( libvshadow_volume_initialize(
	     &volume,
	     &error ) != 1 )
	{
		fprintf(
		 stderr,
		 "Unable to create volume.\n" );

		goto on_error;
	}
#if defined( LIBCSTRING_HAVE_WIDE_SYSTEM_CHARACTER )
	if( libvshadow_volume_open_wide(
	     volume,
	     argv[ 1 ],
	     LIBVSHADOW_OPEN_READ,
	     &error ) != 1 )
#else
	if( libvshadow_volume_open(
	     volume,
	     argv[ 1 ],
	     LIBVSHADOW_OPEN_READ,
	     &error ) != 1 )
#endif
	{
		fprintf(
		 stderr,
		 "Unable to open volume.\n" );

		goto on_error;
	}
	if( libvshadow_volume_get_number_of_stores(
	     volume,
	     &number_of_stores,
	     &error ) != 1 )
	{
		fprintf(
		 stderr,
		 "Unable to retrieve number of stores.\n" );

		goto on_error;
	}
	for( store_index = number_of_stores - 1;
	     store_index >= 0;
	     store_index-- )
	{
		if( libvshadow_volume_get_store(
		     volume,
		     store_index,
		     &store,
		     &error ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to retrieve store: %d.\n",
			 store_index );

			goto on_error;
		}
		if( libvshadow_volume_get_size(
		     volume,
		     &volume_size,
		     &error ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to retrieve volume size.\n" );

			goto on_error;
		}
		fprintf(
		 stdout,
		 "Store: %d volume size: %" PRIu64 " bytes\n",
		 store_index,
		 volume_size );

		if( volume_size > (size64_t) INT64_MAX )
		{
			fprintf(
			 stderr,
			 "Volume size exceeds maximum.\n" );

			goto on_error;
		}
		/* Test: SEEK_SET offset: 0
		 * Expected result: 0
		 */
		if( vshadow_test_seek_offset(
		     store,
		     0,
		     SEEK_SET,
		     0 ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_SET offset: <volume_size>
		 * Expected result: <volume_size>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     (off64_t) volume_size,
		     SEEK_SET,
		     (off64_t) volume_size ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_SET offset: <volume_size / 5>
		 * Expected result: <volume_size / 5>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     (off64_t) ( volume_size / 5 ),
		     SEEK_SET,
		     (off64_t) ( volume_size / 5 ) ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_SET offset: <volume_size + 987>
		 * Expected result: <volume_size + 987>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     (off64_t) ( volume_size + 987 ),
		     SEEK_SET,
		     (off64_t) ( volume_size + 987 ) ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_SET offset: -987
		 * Expected result: -1
		 */
		if( vshadow_test_seek_offset(
		     store,
		     -987,
		     SEEK_SET,
		     -1 ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_CUR offset: 0
		 * Expected result: <volume_size + 987>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     0,
		     SEEK_CUR,
		     (off64_t) ( volume_size + 987 ) ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_CUR offset: <-1 * (volume_size + 987)>
		 * Expected result: 0
		 */
		if( vshadow_test_seek_offset(
		     store,
		     -1 * (off64_t) ( volume_size + 987 ),
		     SEEK_CUR,
		     0 ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_CUR offset: <volume_size / 3>
		 * Expected result: <volume_size / 3>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     (off64_t) ( volume_size / 3 ),
		     SEEK_CUR,
		     (off64_t) ( volume_size / 3 ) ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		if( volume_size == 0 )
		{
			/* Test: SEEK_CUR offset: <-2 * (volume_size / 3)>
			 * Expected result: 0
			 */
			if( vshadow_test_seek_offset(
			     store,
			     -2 * (off64_t) ( volume_size / 3 ),
			     SEEK_CUR,
			     0 ) != 1 )
			{
				fprintf(
				 stderr,
				 "Unable to test seek offset.\n" );

				goto on_error;
			}
		}
		else
		{
			/* Test: SEEK_CUR offset: <-2 * (volume_size / 3)>
			 * Expected result: -1
			 */
			if( vshadow_test_seek_offset(
			     store,
			     -2 * (off64_t) ( volume_size / 3 ),
			     SEEK_CUR,
			     -1 ) != 1 )
			{
				fprintf(
				 stderr,
				 "Unable to test seek offset.\n" );

				goto on_error;
			}
		}
		/* Test: SEEK_END offset: 0
		 * Expected result: <volume_size>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     0,
		     SEEK_END,
		     (off64_t) volume_size ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_END offset: <-1 * volume_size>
		 * Expected result: 0
		 */
		if( vshadow_test_seek_offset(
		     store,
		     -1 * (off64_t) volume_size,
		     SEEK_END,
		     0 ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_END offset: <-1 * (volume_size / 4)>
		 * Expected result: <volume_size - (volume_size / 4)>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     -1 * (off64_t) ( volume_size / 4 ),
		     SEEK_END,
		     (off64_t) volume_size - (off64_t) ( volume_size / 4 ) ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_END offset: 542
		 * Expected result: <volume_size + 542>
		 */
		if( vshadow_test_seek_offset(
		     store,
		     542,
		     SEEK_END,
		     (off64_t) ( volume_size + 542 ) ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: SEEK_END offset: <-1 * (volume_size + 542)>
		 * Expected result: -1
		 */
		if( vshadow_test_seek_offset(
		     store,
		     -1 * (off64_t) ( volume_size + 542 ),
		     SEEK_END,
		     -1 ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Test: UNKNOWN (88) offset: 0
		 * Expected result: -1
		 */
		if( vshadow_test_seek_offset(
		     store,
		     0,
		     88,
		     -1 ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to test seek offset.\n" );

			goto on_error;
		}
		/* Clean up
		 */
		if( libvshadow_store_free(
		     &store,
		     &error ) != 1 )
		{
			fprintf(
			 stderr,
			 "Unable to free store.\n" );

			goto on_error;
		}
	}
	if( libvshadow_volume_close(
	     volume,
	     &error ) != 0 )
	{
		fprintf(
		 stderr,
		 "Unable to close volume.\n" );

		goto on_error;
	}
	if( libvshadow_volume_free(
	     &volume,
	     &error ) != 1 )
	{
		fprintf(
		 stderr,
		 "Unable to free volume.\n" );

		goto on_error;
	}
	return( EXIT_SUCCESS );

on_error:
	if( error != NULL )
	{
		libvshadow_error_backtrace_fprint(
		 error,
		 stderr );
		libvshadow_error_free(
		 &error );
	}
	if( store != NULL )
	{
		libvshadow_store_free(
		 &store,
		 NULL );
	}
	if( volume != NULL )
	{
		libvshadow_volume_close(
		 volume,
		 NULL );
		libvshadow_volume_free(
		 &volume,
		 NULL );
	}
	return( EXIT_FAILURE );
}

