/*
 * Character string functions
 *
 * Copyright (C) 2006-2017, 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 <narrow_string.h>
#include <system_string.h>
#include <types.h>
#include <wide_string.h>

#include "ewftools_libcerror.h"
#include "ewftools_libclocale.h"
#include "ewftools_libuna.h"
#include "ewftools_system_string.h"

/* Copies a string of a decimal value to a 64-bit value
 * Returns 1 if successful or -1 on error
 */
int ewftools_system_string_decimal_copy_to_64_bit(
     const system_character_t *string,
     size_t string_size,
     uint64_t *value_64bit,
     libcerror_error_t **error )
{
	static char *function              = "ewftools_system_string_decimal_copy_to_64_bit";
	size_t string_index                = 0;
	system_character_t character_value = 0;
	uint8_t maximum_string_index       = 20;
	int8_t sign                        = 1;

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

		return( -1 );
	}
	if( string_size > (size_t) SSIZE_MAX )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
		 "%s: invalid string size value exceeds maximum.",
		 function );

		return( -1 );
	}
	if( value_64bit == NULL )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
		 "%s: invalid value 64-bit.",
		 function );

		return( -1 );
	}
	*value_64bit = 0;

	if( string[ string_index ] == (system_character_t) '-' )
	{
		string_index++;
		maximum_string_index++;

		sign = -1;
	}
	else if( string[ string_index ] == (system_character_t) '+' )
	{
		string_index++;
		maximum_string_index++;
	}
	while( string_index < string_size )
	{
		if( string[ string_index ] == 0 )
		{
			break;
		}
		if( string_index > (size_t) maximum_string_index )
		{
			libcerror_error_set(
			 error,
			 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
			 LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_LARGE,
			 "%s: string too large.",
			 function );

			return( -1 );
		}
		*value_64bit *= 10;

		if( ( string[ string_index ] >= (system_character_t) '0' )
		 && ( string[ string_index ] <= (system_character_t) '9' ) )
		{
			character_value = (system_character_t) ( string[ string_index ] - (system_character_t) '0' );
		}
		else
		{
			libcerror_error_set(
			 error,
			 LIBCERROR_ERROR_DOMAIN_RUNTIME,
			 LIBCERROR_RUNTIME_ERROR_UNSUPPORTED_VALUE,
			 "%s: unsupported character value: %" PRIc_SYSTEM " at index: %d.",
			 function,
			 string[ string_index ],
			 string_index );

			return( -1 );
		}
		*value_64bit += character_value;

		string_index++;
	}
	if( sign == -1 )
	{
		*value_64bit *= (uint64_t) -1;
	}
	return( 1 );
}

/* Determines the UTF-8 string size from the system string
 * Returns 1 if successful or -1 on error
 */
int ewftools_string_size_to_utf8_string(
     const system_character_t *string,
     size_t string_size,
     size_t *utf8_string_size,
     libcerror_error_t **error )
{
	static char *function = "ewftools_string_size_to_utf8_string";

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

		return( -1 );
	}
	if( string_size > (size_t) SSIZE_MAX )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
		 "%s: invalid string size value exceeds maximum.",
		 function );

		return( -1 );
	}
	if( utf8_string_size == NULL )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
		 "%s: invalid UTF-8 string size.",
		 function );

		return( -1 );
	}
#if defined( HAVE_WIDE_SYSTEM_CHARACTER )
#if SIZEOF_WCHAR_T == 4
	if( libuna_utf8_string_size_from_utf32(
	     (libuna_utf32_character_t *) string,
	     string_size,
	     utf8_string_size,
	     error ) != 1 )
#elif SIZEOF_WCHAR_T == 2
	if( libuna_utf8_string_size_from_utf16(
	     (libuna_utf16_character_t *) string,
	     string_size,
	     utf8_string_size,
	     error ) != 1 )
#endif
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_CONVERSION,
		 LIBCERROR_CONVERSION_ERROR_GENERIC,
		 "%s: unable to determine UTF-8 string size.",
		 function );

		return( -1 );
	}
#else
	if( libclocale_codepage == 0 )
	{
		*utf8_string_size = 1 + system_string_length(
		                         string );
	}
	else
	{
		if( libuna_utf8_string_size_from_byte_stream(
		     (uint8_t *) string,
		     string_size,
		     libclocale_codepage,
		     utf8_string_size,
		     error ) != 1 )
		{
			libcerror_error_set(
			 error,
			 LIBCERROR_ERROR_DOMAIN_CONVERSION,
			 LIBCERROR_CONVERSION_ERROR_GENERIC,
			 "%s: unable to determine UTF-8 string size.",
			 function );

			return( -1 );
		}
	}
#endif
	return( 1 );
}

/* Copies the UTF-8 string size from the system string
 * Returns 1 if successful or -1 on error
 */
int ewftools_string_copy_to_utf8_string(
     const system_character_t *string,
     size_t string_size,
     uint8_t *utf8_string,
     size_t utf8_string_size,
     libcerror_error_t **error )
{
	static char *function = "ewftools_string_copy_to_utf8_string";

	if( utf8_string == NULL )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
		 "%s: invalid UTF-8 string.",
		 function );

		return( -1 );
	}
	if( utf8_string_size > (size_t) SSIZE_MAX )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
		 "%s: invalid UTF-8 string size value exceeds maximum.",
		 function );

		return( -1 );
	}
	if( string == NULL )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
		 "%s: invalid string.",
		 function );

		return( -1 );
	}
	if( string_size > (size_t) SSIZE_MAX )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
		 LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
		 "%s: invalid string size value exceeds maximum.",
		 function );

		return( -1 );
	}
#if defined( HAVE_WIDE_SYSTEM_CHARACTER )
#if SIZEOF_WCHAR_T == 4
	if( libuna_utf8_string_copy_from_utf32(
	     (libuna_utf8_character_t *) utf8_string,
	     utf8_string_size,
	     (libuna_utf32_character_t *) string,
	     string_size,
	     error ) != 1 )
#elif SIZEOF_WCHAR_T == 2
	if( libuna_utf8_string_copy_from_utf16(
	     (libuna_utf8_character_t *) utf8_string,
	     utf8_string_size,
	     (libuna_utf16_character_t *) string,
	     string_size,
	     error ) != 1 )
#endif
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_CONVERSION,
		 LIBCERROR_CONVERSION_ERROR_GENERIC,
		 "%s: unable to set UTF-8 string.",
		 function );

		return( -1 );
	}
#else
	if( libclocale_codepage == 0 )
	{
		if( utf8_string_size < string_size )
		{
			libcerror_error_set(
			 error,
			 LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
			 LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
			 "%s: UTF-8 string too small.",
			 function );

			return( -1 );
		}
		if( memory_copy(
		     utf8_string,
		     string,
		     string_size ) == NULL )
		{
			libcerror_error_set(
			 error,
			 LIBCERROR_ERROR_DOMAIN_MEMORY,
			 LIBCERROR_MEMORY_ERROR_COPY_FAILED,
			 "%s: unable to set string.",
			 function );

			return( -1 );
		}
	}
	else if( libuna_utf8_string_copy_from_byte_stream(
	          (libuna_utf8_character_t *) utf8_string,
	          utf8_string_size,
	          (uint8_t *) string,
	          string_size,
	          libclocale_codepage,
	          error ) != 1 )
	{
		libcerror_error_set(
		 error,
		 LIBCERROR_ERROR_DOMAIN_CONVERSION,
		 LIBCERROR_CONVERSION_ERROR_GENERIC,
		 "%s: unable to set UTF-8 string.",
		 function );

		return( -1 );
	}
#endif
	return( 1 );
}