This page hosts a formal specification of cpio archive, old binary variant, little-endian using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
use strict;
use warnings;
use IO::KaitaiStruct 0.009_000;
########################################################################
package CpioOldLe;
our @ISA = 'IO::KaitaiStruct::Struct';
sub from_file {
my ($class, $filename) = @_;
my $fd;
open($fd, '<', $filename) or return undef;
binmode($fd);
return new($class, IO::KaitaiStruct::Stream->new($fd));
}
sub new {
my ($class, $_io, $_parent, $_root) = @_;
my $self = IO::KaitaiStruct::Struct->new($_io);
bless $self, $class;
$self->{_parent} = $_parent;
$self->{_root} = $_root || $self;;
$self->_read();
return $self;
}
sub _read {
my ($self) = @_;
$self->{files} = ();
while (!$self->{_io}->is_eof()) {
push @{$self->{files}}, CpioOldLe::File->new($self->{_io}, $self, $self->{_root});
}
}
sub files {
my ($self) = @_;
return $self->{files};
}
########################################################################
package CpioOldLe::File;
our @ISA = 'IO::KaitaiStruct::Struct';
sub from_file {
my ($class, $filename) = @_;
my $fd;
open($fd, '<', $filename) or return undef;
binmode($fd);
return new($class, IO::KaitaiStruct::Stream->new($fd));
}
sub new {
my ($class, $_io, $_parent, $_root) = @_;
my $self = IO::KaitaiStruct::Struct->new($_io);
bless $self, $class;
$self->{_parent} = $_parent;
$self->{_root} = $_root || $self;;
$self->_read();
return $self;
}
sub _read {
my ($self) = @_;
$self->{header} = CpioOldLe::FileHeader->new($self->{_io}, $self, $self->{_root});
$self->{path_name} = $self->{_io}->read_bytes(($self->header()->path_name_size() - 1));
$self->{string_terminator} = $self->{_io}->read_bytes(1);
if (($self->header()->path_name_size() % 2) == 1) {
$self->{path_name_padding} = $self->{_io}->read_bytes(1);
}
$self->{file_data} = $self->{_io}->read_bytes($self->header()->file_size()->value());
if (($self->header()->file_size()->value() % 2) == 1) {
$self->{file_data_padding} = $self->{_io}->read_bytes(1);
}
if ( (($self->path_name() eq pack('C*', (84, 82, 65, 73, 76, 69, 82, 33, 33, 33))) && ($self->header()->file_size()->value() == 0)) ) {
$self->{end_of_file_padding} = $self->{_io}->read_bytes_full();
}
}
sub header {
my ($self) = @_;
return $self->{header};
}
sub path_name {
my ($self) = @_;
return $self->{path_name};
}
sub string_terminator {
my ($self) = @_;
return $self->{string_terminator};
}
sub path_name_padding {
my ($self) = @_;
return $self->{path_name_padding};
}
sub file_data {
my ($self) = @_;
return $self->{file_data};
}
sub file_data_padding {
my ($self) = @_;
return $self->{file_data_padding};
}
sub end_of_file_padding {
my ($self) = @_;
return $self->{end_of_file_padding};
}
########################################################################
package CpioOldLe::FileHeader;
our @ISA = 'IO::KaitaiStruct::Struct';
sub from_file {
my ($class, $filename) = @_;
my $fd;
open($fd, '<', $filename) or return undef;
binmode($fd);
return new($class, IO::KaitaiStruct::Stream->new($fd));
}
sub new {
my ($class, $_io, $_parent, $_root) = @_;
my $self = IO::KaitaiStruct::Struct->new($_io);
bless $self, $class;
$self->{_parent} = $_parent;
$self->{_root} = $_root || $self;;
$self->_read();
return $self;
}
sub _read {
my ($self) = @_;
$self->{magic} = $self->{_io}->read_bytes(2);
$self->{device_number} = $self->{_io}->read_u2le();
$self->{inode_number} = $self->{_io}->read_u2le();
$self->{mode} = $self->{_io}->read_u2le();
$self->{user_id} = $self->{_io}->read_u2le();
$self->{group_id} = $self->{_io}->read_u2le();
$self->{number_of_links} = $self->{_io}->read_u2le();
$self->{r_device_number} = $self->{_io}->read_u2le();
$self->{modification_time} = CpioOldLe::FourByteUnsignedInteger->new($self->{_io}, $self, $self->{_root});
$self->{path_name_size} = $self->{_io}->read_u2le();
$self->{file_size} = CpioOldLe::FourByteUnsignedInteger->new($self->{_io}, $self, $self->{_root});
}
sub magic {
my ($self) = @_;
return $self->{magic};
}
sub device_number {
my ($self) = @_;
return $self->{device_number};
}
sub inode_number {
my ($self) = @_;
return $self->{inode_number};
}
sub mode {
my ($self) = @_;
return $self->{mode};
}
sub user_id {
my ($self) = @_;
return $self->{user_id};
}
sub group_id {
my ($self) = @_;
return $self->{group_id};
}
sub number_of_links {
my ($self) = @_;
return $self->{number_of_links};
}
sub r_device_number {
my ($self) = @_;
return $self->{r_device_number};
}
sub modification_time {
my ($self) = @_;
return $self->{modification_time};
}
sub path_name_size {
my ($self) = @_;
return $self->{path_name_size};
}
sub file_size {
my ($self) = @_;
return $self->{file_size};
}
########################################################################
package CpioOldLe::FourByteUnsignedInteger;
our @ISA = 'IO::KaitaiStruct::Struct';
sub from_file {
my ($class, $filename) = @_;
my $fd;
open($fd, '<', $filename) or return undef;
binmode($fd);
return new($class, IO::KaitaiStruct::Stream->new($fd));
}
sub new {
my ($class, $_io, $_parent, $_root) = @_;
my $self = IO::KaitaiStruct::Struct->new($_io);
bless $self, $class;
$self->{_parent} = $_parent;
$self->{_root} = $_root || $self;;
$self->_read();
return $self;
}
sub _read {
my ($self) = @_;
$self->{most_significant_bits} = $self->{_io}->read_u2le();
$self->{least_significant_bits} = $self->{_io}->read_u2le();
}
sub value {
my ($self) = @_;
return $self->{value} if ($self->{value});
$self->{value} = ($self->least_significant_bits() + ($self->most_significant_bits() << 16));
return $self->{value};
}
sub most_significant_bits {
my ($self) = @_;
return $self->{most_significant_bits};
}
sub least_significant_bits {
my ($self) = @_;
return $self->{least_significant_bits};
}
1;