/* Opens an EWF file for reading
*/
LIBEWF_HANDLE *libewf_open_read( LIBEWF_HANDLE *handle, const char *filename )
{
int file_descriptor;
EWF_FILE_HEADER *file_header;
uint16_t fields_segment;
if( handle == NULL )
{
LIBEWF_FATAL_PRINT( "libewf_open_read: incorrect handle.\n" );
}
file_descriptor = open( filename, O_RDONLY );
if( file_descriptor == -1 )
{
LIBEWF_FATAL_PRINT( "libewf_open: unable to open file: %s\n", filename );
}
file_header = ewf_file_header_read( file_descriptor );
if( file_header == NULL )
{
LIBEWF_FATAL_PRINT( "libewf_open_read: incorrect file header in: %s.\n", filename );
}
fields_segment = convert_16bit( file_header->fields_segment );
LIBEWF_VERBOSE_PRINT( "libewf_open_read: added segment file: %s with file descriptor: %d with segment number: %" PRIu16 ".\n", filename, file_descriptor, fields_segment );
handle->segment_table = libewf_segment_table_set_values( handle->segment_table, fields_segment, filename, file_descriptor );
ewf_file_header_free( file_header );
LIBEWF_VERBOSE_PRINT( "libewf_open_read: open successful.\n" );
return( handle );
}
/* Opens EWF file(s)
* For reading files should contain all filenames that make up an EWF image
* For writing files should contain the base of the filename, extentions like .e01 will be automatically added
* Returns a pointer to the new instance of handle, NULL on error
*/
LIBEWF_HANDLE *libewf_open( char * const filenames[], uint16_t file_amount, uint8_t flags )
{
EWF_FILE_HEADER file_header;
LIBEWF_INTERNAL_HANDLE *internal_handle = NULL;
char *error_string = NULL;
uint32_t iterator = 0;
uint16_t fields_segment = 0;
int file_descriptor = 0;
if( ( flags == LIBEWF_OPEN_READ ) || ( flags == LIBEWF_OPEN_READ_WRITE ) )
{
/* 1 additional entry required because
* entry [ 0 ] is not used for reading
*/
internal_handle = libewf_internal_handle_alloc( ( file_amount + 1 ), flags );
if( internal_handle == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to create handle.\n" );
return( NULL );
}
if( internal_handle->segment_table == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_open: invalid handle - missing segment table.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
for( iterator = 0; iterator < file_amount; iterator++ )
{
file_descriptor = libewf_common_open( filenames[ iterator ], flags );
if( file_descriptor == -1 )
{
error_string = libewf_common_strerror( errno );
if( error_string == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to open file: %s.\n", filenames[ iterator ] );
}
else
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to open file: %s with error: %s.\n", filenames[ iterator ], error_string );
libewf_common_free( error_string );
}
libewf_internal_handle_free( internal_handle );
return( NULL );
}
if( ewf_file_header_read( &file_header, file_descriptor ) <= -1 )
{
LIBEWF_WARNING_PRINT( "libewf_open: invalid file header in: %s.\n", filenames[ iterator ] );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
if( ewf_file_header_check_signature( file_header.signature ) == 0 )
{
LIBEWF_WARNING_PRINT( "libewf_open: file signature does not match.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
if( libewf_endian_convert_16bit( &fields_segment, file_header.fields_segment ) != 1 )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to convert fields segment value.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
LIBEWF_VERBOSE_PRINT( "libewf_open: added segment file: %s with file descriptor: %d with segment number: %" PRIu16 ".\n",
filenames[ iterator ], file_descriptor, fields_segment );
if( libewf_segment_table_set_filename( internal_handle->segment_table, fields_segment, filenames[ iterator ], libewf_common_string_length( filenames[ iterator ] ) ) != 1 )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to set filename in segment table.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
if( libewf_segment_table_set_file_descriptor( internal_handle->segment_table, fields_segment, file_descriptor ) != 1 )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to set file descriptor in segment table.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
}
if( libewf_read_build_index( internal_handle ) != 1 )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to create index.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
}
else if( flags == LIBEWF_OPEN_WRITE )
{
/* Allocate 2 entries
* entry [ 0 ] is used for the base filename
*/
internal_handle = libewf_internal_handle_alloc( 1, flags );
if( internal_handle == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to create handle.\n" );
return( NULL );
}
if( internal_handle->segment_table == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_open: invalid handle - missing segment table.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
if( libewf_segment_table_set_filename( internal_handle->segment_table, 0, filenames[ iterator ], libewf_common_string_length( filenames[ iterator ] ) ) != 1 )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to set filename in segment table.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
if( libewf_segment_table_set_file_descriptor( internal_handle->segment_table, 0, -1 ) != 1 )
{
LIBEWF_WARNING_PRINT( "libewf_open: unable to set file descriptor in segment table.\n" );
libewf_internal_handle_free( internal_handle );
return( NULL );
}
}
else
{
LIBEWF_WARNING_PRINT( "libewf_open: unsupported flags.\n" );
return( NULL );
}
LIBEWF_VERBOSE_PRINT( "libewf_open: open successful.\n" );
return( (LIBEWF_HANDLE *) internal_handle );
}