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libsmdev_string.c
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libsmdev_string.c
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/*
* System character type string functions
*
* Copyright (c) 2010-2012, Joachim Metz <jbmetz@users.sourceforge.net>
*
* 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 <types.h>
#include <libcstring.h>
#include <liberror.h>
#include "libsmdev_string.h"
#if defined( _cplusplus )
extern "C" {
#endif
/* Copies and trims the string from the byte stream
* Returns the number of bytes copied or -1 on error
*/
ssize_t libsmdev_string_trim_copy_from_byte_stream(
libcstring_character_t *string,
size_t string_size,
const uint8_t *byte_stream,
size_t byte_stream_size,
liberror_error_t **error )
{
static char *function = "libsmdev_string_trim_copy_from_byte_stream";
size_t string_iterator = 0;
ssize_t first_character = 0;
ssize_t last_character = 0;
if( string == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid string.",
function );
return( -1 );
}
if( string_size > (size_t) SSIZE_MAX )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid string size value exceeds maximum.",
function );
return( -1 );
}
if( byte_stream == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid byte stream.",
function );
return( -1 );
}
if( byte_stream_size > (size_t) SSIZE_MAX )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid byte stream size value exceeds maximum.",
function );
return( -1 );
}
for( first_character = 0;
first_character < (ssize_t) byte_stream_size;
first_character++ )
{
if( ( byte_stream[ first_character ] >= (uint8_t) 0x21 )
&& ( byte_stream[ first_character ] <= (uint8_t) 0x7e ) )
{
break;
}
}
for( last_character = (ssize_t) byte_stream_size;
last_character >= 0;
last_character-- )
{
if( ( byte_stream[ last_character ] >= (uint8_t) 0x21 )
&& ( byte_stream[ last_character ] <= (uint8_t) 0x7e ) )
{
break;
}
}
if( first_character < last_character )
{
if( string_size < (size_t) ( last_character - first_character + 1 ) )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: string too small.",
function );
return( -1 );
}
while( first_character <= last_character )
{
string[ string_iterator++ ] = (libcstring_character_t) byte_stream[ first_character++ ];
}
}
string[ string_iterator ] = 0;
return( (ssize_t) string_iterator );
}

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