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Edit File: FileHandle_with_pushback.pm

package Archive::Cpio::FileHandle_with_pushback; sub new { my ($class, $F) = @_; bless { F => $F, already_read => '' }, $class; } sub pushback { my ($FHwp, $s) = @_; $FHwp->{already_read} .= $s; } sub read { my ($FHwp, $size) = @_; $size or return; $size =~ /^\d+$/ or die "bad size $size\n"; my $tmp = ''; if ($FHwp->{already_read}) { $tmp = substr($FHwp->{already_read}, 0, $size); substr($FHwp->{already_read}, 0, $size) = ''; $size -= length($tmp); } read($FHwp->{F}, $tmp, $size, length($tmp)) == $size or die "unexpected end of file while reading (got $tmp)\n"; $tmp; } sub read_ahead { my ($FHwp, $size) = @_; my $s = $FHwp->read($size); $FHwp->pushback($s); $s; } 1;