package Parse::Binary::Nested;
+use 5.010;
use strict;
use warnings;
use Carp;
+use Exporter qw(import);
-our $VERSION = '1.01';
+our $VERSION = '1.10';
+our @EXPORT_OK = qw(unpackf);
sub new {
my ($class, $format) = @_;
+ ref $format
+ or $format = [0 => $format];
ref $format eq 'ARRAY'
or croak "Invalid Parse::Binary::Nested format: should be an array ref";
- bless $format, $class;
+ bless [$format, $class->template($format)], $class;
}
sub template {
: $count."X[$count]$count/($value)";
}
else {
- $value =~ s/=\d*//g; # hardcoded values
- $value =~ s/^C(a)(\d+)/$1 . ($2 + 1)/e; # length prefix
+ $value =~ s/=(?:\d+|.)//g; # hardcoded values
+ $value =~ s{^C/(a)(\d+)}{$1 . ($2 + 1)}e; # maximum length
}
$value;
} reverse 0 .. ($#$format - 1) >> 1;
}
sub convert {
- my ($self, $format, $data) = @_;
+ my ($self, $format, $data, $pos) = @_;
# map flat results into a named and nested hash
my %res;
- while (my ($field, $template) = splice @$format, 0, 2) {
+ $pos ||= \(my $_pos);
+ for (my $i = 0; $i < $#$format; $i += 2) {
+ my ($field, $template) = @$format[$i, $i+1];
if (ref $template eq 'ARRAY') {
my ($count, @subformat) = @$template;
+ $$pos++ if $count eq 'C';
my $max = $count =~ s/^(\d+)// ? $1 : 0;
$count = !$count ? $max
: $count eq '*' ? $res{levelcount}->{total} : shift @$data;
- $res{$field}->[$_] = $self->convert([@subformat], $data) for 0 .. ($max || $count)-1;
+ $res{$field}->[$_] = $self->convert(\@subformat, $data, $pos)
+ for 0 .. ($max || $count)-1;
splice @{ $res{$field} }, $count if $max > $count;
$res{$field} = $res{$field}->[0] if $max == 1;
next;
}
- elsif ($template =~ /^Ca/) {
- $data->[0] = unpack 'C/a', $data->[0];
- }
- elsif ($template =~ /^(?:[xX]\d*)*$/) {
- next; # no values
- }
- elsif ($template =~ /=(\d+)?/) {
- $res{$field} = $1;
- next;
+ else {
+ for (split m{(?![0-9*/])(?<![/=])}, $template) {
+ my ($type, $count) = m{^(\D+)(\d+)?$} or die 'unsupported';
+ my $mult = $count // 1;
+ given ($type) {
+ when (['c', 'C']) {
+ $$pos += $mult;
+ }
+ when ('x') {
+ $$pos += $mult;
+ next;
+ }
+ when (['b', 'B']) {
+ $$pos++;
+ }
+ when (['s', 'S', 'n', 'v']) {
+ $$pos += $mult * 2;
+ }
+ when (['a', 'A', 'Z', 'a*']) {
+ $$pos += length $data->[0];
+ }
+ when ('Z*') {
+ $$pos += $count // 1 + length $data->[0];
+ }
+ when (['C/a', 'C/A']) {
+ $$pos += 1 + ($count // length $data->[0]);
+ $data->[0] = unpack 'C/a', $data->[0] if defined $count;
+ }
+ when ('=') {
+ unshift @$data, $count;
+ }
+ when ('=.') {
+ unshift @$data, $$pos;
+ }
+ when ('X') {
+ $$pos -= $mult;
+ next;
+ }
+ default {
+ carp "Unrecognised template element '$type'";
+ }
+ }
+ if (defined $res{$field}) {
+ $res{$field} = [ $res{$field} ] unless ref $res{$field} eq 'ARRAY';
+ push @{ $res{$field} }, shift @$data;
+ }
+ else {
+ $res{$field} = shift @$data;
+ }
+ }
}
- $res{$field} = shift @$data;
}
return \%res;
}
sub unpackf {
- my ($self, $input) = @_;
- my @data = unpack $self->template($self), $input;
- return $self->convert([@$self], \@data);
+ my ($format, $input) = @_;
+ my $self = UNIVERSAL::isa($format, __PACKAGE__) ? $format
+ : __PACKAGE__->new($format);
+ my @data = unpack $self->[1], $input;
+ return $self->convert($self->[0], \@data);
}
1;
=head1 SYNOPSIS
- use Parse::Binary::Nested;
+ use Parse::Binary::Nested qw(unpackf);
+ my $data = unpackf([message => 'Z*'], "hi\0");
+
my $parser = Parser::Binary::Nested->new([
foos => [
'C', # count
],
trail => 'a*',
]);
-
- my $data = $parser->unpackf("\1foo\0.rest");
+ $data = $parser->unpackf("\1foo\0.rest");
print $data->{foos}->[0]->{message};
=head1 DESCRIPTION