0 A 0ˆl–Ãa¾”êh¥8 ]¸î¥1hßÃ „uÖ]k_‹uÐb &=LV[(ÂÁ?÷ package Tie::File; require 5.005; use Carp ':DEFAULT', 'confess'; use POSIX 'SEEK_SET'; use Fcntl 'O_CREAT', 'O_RDWR', 'LOCK_EX', 'LOCK_SH', 'O_WRONLY', 'O_RDONLY'; sub O_ACCMODE () { O_RDONLY | O_RDWR | O_WRONLY } $VERSION = "0.98"; my $DEFAULT_MEMORY_SIZE = 1<<21; # 2 megabytes my $DEFAULT_AUTODEFER_THRESHHOLD = 3; # 3 records my $DEFAULT_AUTODEFER_FILELEN_THRESHHOLD = 65536; # 16 disk blocksful my %good_opt = map {$_ => 1, "-$_" => 1} qw(memory dw_size mode recsep discipline autodefer autochomp autodefer_threshhold concurrent); sub TIEARRAY { if (@_ % 2 != 0) { croak "usage: tie \@array, $_[0], filename, [option => value]..."; } my ($pack, $file, %opts) = @_; # transform '-foo' keys into 'foo' keys for my $key (keys %opts) { unless ($good_opt{$key}) { croak("$pack: Unrecognized option '$key'\n"); } my $okey = $key; if ($key =~ s/^-+//) { $opts{$key} = delete $opts{$okey}; } } if ($opts{concurrent}) { croak("$pack: concurrent access not supported yet\n"); } unless (defined $opts{memory}) { # default is the larger of the default cache size and the # deferred-write buffer size (if specified) $opts{memory} = $DEFAULT_MEMORY_SIZE; $opts{memory} = $opts{dw_size} if defined $opts{dw_size} && $opts{dw_size} > $DEFAULT_MEMORY_SIZE; # Dora Winifred Read } $opts{dw_size} = $opts{memory} unless defined $opts{dw_size}; if ($opts{dw_size} > $opts{memory}) { croak("$pack: dw_size may not be larger than total memory allocation\n"); } # are we in deferred-write mode? $opts{defer} = 0 unless defined $opts{defer}; $opts{deferred} = {}; # no records are presently deferred $opts{deferred_s} = 0; # count of total bytes in ->{deferred} $opts{deferred_max} = -1; # empty # What's a good way to arrange that this class can be overridden? $opts{cache} = Tie::File::Cache->new($opts{memory}); # autodeferment is enabled by default $opts{autodefer} = 1 unless defined $opts{autodefer}; $opts{autodeferring} = 0; # but is not initially active $opts{ad_history} = []; $opts{autodefer_threshhold} = $DEFAULT_AUTODEFER_THRESHHOLD unless defined $opts{autodefer_threshhold}; $opts{autodefer_filelen_threshhold} = $DEFAULT_AUTODEFER_FILELEN_THRESHHOLD unless defined $opts{autodefer_filelen_threshhold}; $opts{offsets} = [0]; $opts{filename} = $file; unless (defined $opts{recsep}) { $opts{recsep} = _default_recsep(); } $opts{recseplen} = length($opts{recsep}); if ($opts{recseplen} == 0) { croak "Empty record separator not supported by $pack"; } $opts{autochomp} = 1 unless defined $opts{autochomp}; $opts{mode} = O_CREAT|O_RDWR unless defined $opts{mode}; $opts{rdonly} = (($opts{mode} & O_ACCMODE) == O_RDONLY); $opts{sawlastrec} = undef; my $fh; if (UNIVERSAL::isa($file, 'GLOB')) { # We use 1 here on the theory that some systems # may not indicate failure if we use 0. # MSWin32 does not indicate failure with 0, but I don't know if # it will indicate failure with 1 or not. unless (seek $file, 1, SEEK_SET) { croak "$pack: your filehandle does not appear to be seekable"; } seek $file, 0, SEEK_SET; # put it back $fh = $file; # setting binmode is the user's problem } elsif (ref $file) { croak "usage: tie \@array, $pack, filename, [option => value]..."; } else { # $fh = \do { local *FH }; # XXX this is buggy if ($] < 5.006) { # perl 5.005 and earlier don't autovivify filehandles require Symbol; $fh = Symbol::gensym(); } sysopen $fh, $file, $opts{mode}, 0666 or return; binmode $fh; ++$opts{ourfh}; } { my $ofh = select $fh; $| = 1; select $ofh } # autoflush on write if (defined $opts{discipline} && $] >= 5.006) { # This avoids a compile-time warning under 5.005 eval 'binmode($fh, $opts{