package Tie::File;
require 5.005;
-use Carp;
+use Carp ':DEFAULT', 'confess';
use POSIX 'SEEK_SET';
-use Fcntl 'O_CREAT', 'O_RDWR', 'LOCK_EX', 'O_WRONLY', 'O_RDONLY';
+use Fcntl 'O_CREAT', 'O_RDWR', 'LOCK_EX', 'LOCK_SH', 'O_WRONLY', 'O_RDONLY';
sub O_ACCMODE () { O_RDONLY | O_RDWR | O_WRONLY }
-$VERSION = "0.93";
+
+$VERSION = "0.95";
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, "-$_" => 1}
- qw(memory dw_size mode recsep discipline autodefer autochomp);
+my %good_opt = map {$_ => 1, "-$_" => 1}
+ qw(memory dw_size mode recsep discipline
+ autodefer autochomp autodefer_threshhold);
sub TIEARRAY {
if (@_ % 2 != 0) {
# 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}
+ $opts{memory} = $opts{dw_size}
if defined $opts{dw_size} && $opts{dw_size} > $DEFAULT_MEMORY_SIZE;
# Dora Winifred Read
}
$opts{deferred_s} = 0; # count of total bytes in ->{deferred}
$opts{deferred_max} = -1; # empty
- # the cache is a hash instead of an array because it is likely to be
- # sparsely populated
- $opts{cache} = Tie::File::Cache->new($opts{memory});
+ # 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};
my $rec;
# check the defer buffer
- if ($self->_is_deferring && exists $self->{deferred}{$n}) {
- $rec = $self->{deferred}{$n};
- } else {
- $rec = $self->_fetch($n);
- }
+ $rec = $self->{deferred}{$n} if exists $self->{deferred}{$n};
+ $rec = $self->_fetch($n) unless defined $rec;
- $self->_chomp1($rec);
+ # inlined _chomp1
+ substr($rec, - $self->{recseplen}) = ""
+ if defined $rec && $self->{autochomp};
+ $rec;
}
# Chomp many records in-place; return nothing useful
}
if ($#{$self->{offsets}} < $n) {
- return if $self->{eof};
+ return if $self->{eof}; # request for record beyond end of file
my $o = $self->_fill_offsets_to($n);
# If it's still undefined, there is no such record, so return 'undef'
return unless defined $o;
# 20020324 Wait, but this DOES alter the cache. TODO BUG?
my $oldrec = $self->_fetch($n);
- if (defined($self->{cache}->lookup($n))) {
- $self->{cache}->update($n, $rec);
- }
-
if (not defined $oldrec) {
# We're storing a record beyond the end of the file
$self->_extend_file_to($n+1);
$oldrec = $self->{recsep};
}
+# return if $oldrec eq $rec; # don't bother
my $len_diff = length($rec) - length($oldrec);
# length($oldrec) here is not consistent with text mode TODO XXX BUG
- $self->_twrite($rec, $self->{offsets}[$n], length($oldrec));
-
- # now update the offsets
- # array slice goes from element $n+1 (the first one to move)
- # to the end
- for (@{$self->{offsets}}[$n+1 .. $#{$self->{offsets}}]) {
- $_ += $len_diff;
- }
+ $self->_mtwrite($rec, $self->{offsets}[$n], length($oldrec));
+ $self->_oadjust([$n, 1, $rec]);
+ $self->{cache}->update($n, $rec);
}
sub _store_deferred {
sub FETCHSIZE {
my $self = shift;
- my $n = $#{$self->{offsets}};
- # 20020317 Change this to binary search
- unless ($self->{eof}) {
- while (defined ($self->_fill_offsets_to($n+1))) {
- ++$n;
- }
- }
+ my $n = $self->{eof} ? $#{$self->{offsets}} : $self->_fill_offsets;
+
my $top_deferred = $self->_defer_max;
$n = $top_deferred+1 if defined $top_deferred && $n < $top_deferred+1;
$n;
$self->{cache}->remove(grep $_ >= $len, $self->{cache}->ckeys);
}
+### OPTIMIZE ME
+### It should not be necessary to do FETCHSIZE
+### Just seek to the end of the file.
sub PUSH {
my $self = shift;
$self->SPLICE($self->FETCHSIZE, scalar(@_), @_);
-# $self->FETCHSIZE; # av.c takes care of this for me
+
+ # No need to return:
+ # $self->FETCHSIZE; # because av.c takes care of this for me
}
sub POP {
sub EXISTS {
my ($self, $n) = @_;
return 1 if exists $self->{deferred}{$n};
- $self->_fill_offsets_to($n); # I think this is unnecessary
$n < $self->FETCHSIZE;
}
$nrecs = $oldsize - $pos + $nrecs;
$nrecs = 0 if $nrecs < 0;
}
+
+ # nrecs is too big---it really means "until the end"
+ # 20030507
+ if ($nrecs + $pos > $oldsize) {
+ $nrecs = $oldsize - $pos;
+ }
}
$self->_fixrecs(@data);
$oldlen += $self->{offsets}[$_+1] - $self->{offsets}[$_]
if defined $self->{offsets}[$_+1];
}
+ $self->_fill_offsets_to($pos+$nrecs);
# Modify the file
- $self->_twrite($data, $self->{offsets}[$pos], $oldlen);
-
- # update the offsets table part 1
- # compute the offsets of the new records:
- my @new_offsets;
- if (@data) {
- push @new_offsets, $self->{offsets}[$pos];
- for (0 .. $#data-1) {
- push @new_offsets, $new_offsets[-1] + length($data[$_]);
+ $self->_mtwrite($data, $self->{offsets}[$pos], $oldlen);
+ # Adjust the offsets table
+ $self->_oadjust([$pos, $nrecs, @data]);
+
+ { # Take this read cache stuff out into a separate function
+ # You made a half-attempt to put it into _oadjust.
+ # Finish something like that up eventually.
+ # STORE also needs to do something similarish
+
+ # update the read cache, part 1
+ # modified records
+ for ($pos .. $pos+$nrecs-1) {
+ my $new = $data[$_-$pos];
+ if (defined $new) {
+ $self->{cache}->update($_, $new);
+ } else {
+ $self->{cache}->remove($_);
+ }
}
- }
-
- # If we're about to splice out the end of the offsets table...
- if ($pos + $nrecs >= @{$self->{offsets}}) {
- $self->{eof} = 0; # ... the table is no longer complete
- }
- splice(@{$self->{offsets}}, $pos, $nrecs, @new_offsets);
-
- # update the offsets table part 2
- # adjust the offsets of the following old records
- for ($pos+@data .. $#{$self->{offsets}}) {
- $self->{offsets}[$_] += $datalen - $oldlen;
- }
- # If we scrubbed out all known offsets, regenerate the trivial table
- # that knows that the file does indeed start at 0.
- $self->{offsets}[0] = 0 unless @{$self->{offsets}};
- # If the file got longer, the offsets table is no longer complete
- $self->{eof} = 0 if @data > $nrecs;
-
-
- # Perhaps the following cache foolery could be factored out
- # into a bunch of mor opaque cache functions. For example,
- # it's odd to delete a record from the cache and then remove
- # it from the LRU queue later on; there should be a function to
- # do both at once.
-
- # update the read cache, part 1
- # modified records
- for ($pos .. $pos+$nrecs-1) {
- my $new = $data[$_-$pos];
- if (defined $new) {
- $self->{cache}->update($_, $new);
- } else {
- $self->{cache}->remove($_);
+
+ # update the read cache, part 2
+ # moved records - records past the site of the change
+ # need to be renumbered
+ # Maybe merge this with the previous block?
+ {
+ my @oldkeys = grep $_ >= $pos + $nrecs, $self->{cache}->ckeys;
+ my @newkeys = map $_-$nrecs+@data, @oldkeys;
+ $self->{cache}->rekey(\@oldkeys, \@newkeys);
}
- }
- # update the read cache, part 2
- # moved records - records past the site of the change
- # need to be renumbered
- # Maybe merge this with the previous block?
- {
- my @oldkeys = grep $_ >= $pos + $nrecs, $self->{cache}->ckeys;
- my @newkeys = map $_-$nrecs+@data, @oldkeys;
- $self->{cache}->rekey(\@oldkeys, \@newkeys);
+ # Now there might be too much data in the cache, if we spliced out
+ # some short records and spliced in some long ones. If so, flush
+ # the cache.
+ $self->_cache_flush;
}
- # Now there might be too much data in the cache, if we spliced out
- # some short records and spliced in some long ones. If so, flush
- # the cache.
- $self->_cache_flush;
-
# Yes, the return value of 'splice' *is* actually this complicated
wantarray ? @result : @result ? $result[-1] : undef;
}
+
# write data into the file
-# $data is the data to be written.
+# $data is the data to be written.
# it should be written at position $pos, and should overwrite
# exactly $len of the following bytes.
# Note that if length($data) > $len, the subsequent bytes will have to
$readpos += $br;
$writepos += length $data;
$data = $next_block;
- } while $more_data; # BUG XXX TODO how could this have worked?
+ } while $more_data;
$self->_seekb($writepos);
$self->_write_record($next_block);
$self->_chop_file if $len_diff < 0;
}
+# _iwrite(D, S, E)
+# Insert text D at position S.
+# Let C = E-S-|D|. If C < 0; die.
+# Data in [S,S+C) is copied to [S+D,S+D+C) = [S+D,E).
+# Data in [S+C = E-D, E) is returned. Data in [E, oo) is untouched.
+#
+# In a later version, don't read the entire intervening area into
+# memory at once; do the copying block by block.
+sub _iwrite {
+ my $self = shift;
+ my ($D, $s, $e) = @_;
+ my $d = length $D;
+ my $c = $e-$s-$d;
+ local *FH = $self->{fh};
+ confess "Not enough space to insert $d bytes between $s and $e"
+ if $c < 0;
+ confess "[$s,$e) is an invalid insertion range" if $e < $s;
+
+ $self->_seekb($s);
+ read FH, my $buf, $e-$s;
+
+ $D .= substr($buf, 0, $c, "");
+
+ $self->_seekb($s);
+ $self->_write_record($D);
+
+ return $buf;
+}
+
+# Like _twrite, but the data-pos-len triple may be repeated; you may
+# write several chunks. All the writing will be done in
+# one pass. Chunks SHALL be in ascending order and SHALL NOT overlap.
+sub _mtwrite {
+ my $self = shift;
+ my $unwritten = "";
+ my $delta = 0;
+
+ @_ % 3 == 0
+ or die "Arguments to _mtwrite did not come in groups of three";
+
+ while (@_) {
+ my ($data, $pos, $len) = splice @_, 0, 3;
+ my $end = $pos + $len; # The OLD end of the segment to be replaced
+ $data = $unwritten . $data;
+ $delta -= length($unwritten);
+ $unwritten = "";
+ $pos += $delta; # This is where the data goes now
+ my $dlen = length $data;
+ $self->_seekb($pos);
+ if ($len >= $dlen) { # the data will fit
+ $self->_write_record($data);
+ $delta += ($dlen - $len); # everything following moves down by this much
+ $data = ""; # All the data in the buffer has been written
+ } else { # won't fit
+ my $writable = substr($data, 0, $len - $delta, "");
+ $self->_write_record($writable);
+ $delta += ($dlen - $len); # everything following moves down by this much
+ }
+
+ # At this point we've written some but maybe not all of the data.
+ # There might be a gap to close up, or $data might still contain a
+ # bunch of unwritten data that didn't fit.
+ my $ndlen = length $data;
+ if ($delta == 0) {
+ $self->_write_record($data);
+ } elsif ($delta < 0) {
+ # upcopy (close up gap)
+ if (@_) {
+ $self->_upcopy($end, $end + $delta, $_[1] - $end);
+ } else {
+ $self->_upcopy($end, $end + $delta);
+ }
+ } else {
+ # downcopy (insert data that didn't fit; replace this data in memory
+ # with _later_ data that doesn't fit)
+ if (@_) {
+ $unwritten = $self->_downcopy($data, $end, $_[1] - $end);
+ } else {
+ # Make the file longer to accomodate the last segment that doesn'
+ $unwritten = $self->_downcopy($data, $end);
+ }
+ }
+ }
+}
+
+# Copy block of data of length $len from position $spos to position $dpos
+# $dpos must be <= $spos
+#
+# If $len is undefined, go all the way to the end of the file
+# and then truncate it ($spos - $dpos bytes will be removed)
+sub _upcopy {
+ my $blocksize = 8192;
+ my ($self, $spos, $dpos, $len) = @_;
+ if ($dpos > $spos) {
+ die "source ($spos) was upstream of destination ($dpos) in _upcopy";
+ } elsif ($dpos == $spos) {
+ return;
+ }
+
+ while (! defined ($len) || $len > 0) {
+ my $readsize = ! defined($len) ? $blocksize
+ : $len > $blocksize ? $blocksize
+ : $len;
+
+ my $fh = $self->{fh};
+ $self->_seekb($spos);
+ my $bytes_read = read $fh, my $data, $readsize;
+ $self->_seekb($dpos);
+ if ($data eq "") {
+ $self->_chop_file;
+ last;
+ }
+ $self->_write_record($data);
+ $spos += $bytes_read;
+ $dpos += $bytes_read;
+ $len -= $bytes_read if defined $len;
+ }
+}
+
+# Write $data into a block of length $len at position $pos,
+# moving everything in the block forwards to make room.
+# Instead of writing the last length($data) bytes from the block
+# (because there isn't room for them any longer) return them.
+sub _downcopy {
+ my $blocksize = 8192;
+ my ($self, $data, $pos, $len) = @_;
+ my $fh = $self->{fh};
+
+ while (! defined $len || $len > 0) {
+ my $readsize = ! defined($len) ? $blocksize
+ : $len > $blocksize? $blocksize : $len;
+ $self->_seekb($pos);
+ read $fh, my $old, $readsize;
+ $data .= $old;
+ $self->_seekb($pos);
+ my $writable = substr($data, 0, $readsize, "");
+ last if $writable eq "";
+ $self->_write_record($writable);
+ $len -= $readsize if defined $len;
+ $pos += $readsize;
+ }
+ return $data;
+}
+
+# Adjust the object data structures following an '_mtwrite'
+# Arguments are
+# [$pos, $nrecs, @length] items
+# indicating that $nrecs records were removed at $recpos (a record offset)
+# and replaced with records of length @length...
+# Arguments guarantee that $recpos is strictly increasing.
+# No return value
+sub _oadjust {
+ my $self = shift;
+ my $delta = 0;
+ my $delta_recs = 0;
+ my $prev_end = -1;
+ my %newkeys;
+
+ for (@_) {
+ my ($pos, $nrecs, @data) = @$_;
+ $pos += $delta_recs;
+
+ # Adjust the offsets of the records after the previous batch up
+ # to the first new one of this batch
+ for my $i ($prev_end+2 .. $pos - 1) {
+ $self->{offsets}[$i] += $delta;
+ $newkey{$i} = $i + $delta_recs;
+ }
+
+ $prev_end = $pos + @data - 1; # last record moved on this pass
+
+ # Remove the offsets for the removed records;
+ # replace with the offsets for the inserted records
+ my @newoff = ($self->{offsets}[$pos] + $delta);
+ for my $i (0 .. $#data) {
+ my $newlen = length $data[$i];
+ push @newoff, $newoff[$i] + $newlen;
+ $delta += $newlen;
+ }
+
+ for my $i ($pos .. $pos+$nrecs-1) {
+ last if $i+1 > $#{$self->{offsets}};
+ my $oldlen = $self->{offsets}[$i+1] - $self->{offsets}[$i];
+ $delta -= $oldlen;
+ }
+
+# # also this data has changed, so update it in the cache
+# for (0 .. $#data) {
+# $self->{cache}->update($pos + $_, $data[$_]);
+# }
+# if ($delta_recs) {
+# my @oldkeys = grep $_ >= $pos + @data, $self->{cache}->ckeys;
+# my @newkeys = map $_ + $delta_recs, @oldkeys;
+# $self->{cache}->rekey(\@oldkeys, \@newkeys);
+# }
+
+ # replace old offsets with new
+ splice @{$self->{offsets}}, $pos, $nrecs+1, @newoff;
+ # What if we just spliced out the end of the offsets table?
+ # shouldn't we clear $self->{eof}? Test for this XXX BUG TODO
+
+ $delta_recs += @data - $nrecs; # net change in total number of records
+ }
+
+ # The trailing records at the very end of the file
+ if ($delta) {
+ for my $i ($prev_end+2 .. $#{$self->{offsets}}) {
+ $self->{offsets}[$i] += $delta;
+ }
+ }
+
+ # If we scrubbed out all known offsets, regenerate the trivial table
+ # that knows that the file does indeed start at 0.
+ $self->{offsets}[0] = 0 unless @{$self->{offsets}};
+ # If the file got longer, the offsets table is no longer complete
+ # $self->{eof} = 0 if $delta_recs > 0;
+
+ # Now there might be too much data in the cache, if we spliced out
+ # some short records and spliced in some long ones. If so, flush
+ # the cache.
+ $self->_cache_flush;
+}
+
# If a record does not already end with the appropriate terminator
# string, append one.
sub _fixrecs {
defined($o)
or confess("logic error: undefined offset for record $n");
seek $self->{fh}, $o, SEEK_SET
- or die "Couldn't seek filehandle: $!"; # "Should never happen."
+ or confess "Couldn't seek filehandle: $!"; # "Should never happen."
}
+# seek to byte $b in the file
sub _seekb {
my ($self, $b) = @_;
seek $self->{fh}, $b, SEEK_SET
my $rec;
until ($#OFF >= $n) {
- my $o = $OFF[-1];
$self->_seek(-1); # tricky -- see comment at _seek
$rec = $self->_read_record;
if (defined $rec) {
- push @OFF, tell $fh;
+ push @OFF, int(tell $fh); # Tels says that int() saves memory here
} else {
$self->{eof} = 1;
return; # It turns out there is no such record
# we have now read all the records up to record n-1,
# so we can return the offset of record n
- return $OFF[$n];
+ $OFF[$n];
+}
+
+sub _fill_offsets {
+ my ($self) = @_;
+
+ my $fh = $self->{fh};
+ local *OFF = $self->{offsets};
+
+ $self->_seek(-1); # tricky -- see comment at _seek
+
+ # Tels says that inlining read_record() would make this loop
+ # five times faster. 20030508
+ while ( defined $self->_read_record()) {
+ # int() saves us memory here
+ push @OFF, int(tell $fh);
+ }
+
+ $self->{eof} = 1;
+ $#OFF;
}
# assumes that $rec is already suitably terminated
# Todo : just use $self->{recsep} x $extras here?
while ($extras-- > 0) {
$self->_write_record($self->{recsep});
- push @{$self->{offsets}}, tell $self->{fh};
+ push @{$self->{offsets}}, int(tell $self->{fh});
}
}
# The result should be at least $n.
sub _bufsize {
my $n = shift;
- return 8192 if $n < 0;
+ return 8192 if $n <= 0;
my $b = $n & ~8191;
$b += 8192 if $n & 8191;
$b;
}
my $fh = $self->{fh};
$op = LOCK_EX unless defined $op;
- flock $fh, $op;
+ my $locked = flock $fh, $op;
+
+ if ($locked && ($op & (LOCK_EX | LOCK_SH))) {
+ # If you're locking the file, then presumably it's because
+ # there might have been a write access by another process.
+ # In that case, the read cache contents and the offsets table
+ # might be invalid, so discard them. 20030508
+ $self->{offsets} = [0];
+ $self->{cache}->empty;
+ }
+
+ $locked;
}
# Get/set autochomp option
}
}
+# Get offset table entries; returns offset of nth record
+sub offset {
+ my ($self, $n) = @_;
+
+ if ($#{$self->{offsets}} < $n) {
+ return if $self->{eof}; # request for record beyond the end of file
+ my $o = $self->_fill_offsets_to($n);
+ # If it's still undefined, there is no such record, so return 'undef'
+ return unless defined $o;
+ }
+
+ $self->{offsets}[$n];
+}
+
+sub discard_offsets {
+ my $self = shift;
+ $self->{offsets} = [0];
+}
+
################################################################
#
# Matters related to deferred writing
#
# This could be better optimized to write the file in one pass, instead
# of one pass per block of records. But that will require modifications
-# to _twrite, so I should have a good _twite test suite first.
+# to _twrite, so I should have a good _twrite test suite first.
sub flush {
my $self = shift;
$self->{defer} = 0;
}
-sub _flush {
+sub _old_flush {
my $self = shift;
my @writable = sort {$a<=>$b} (keys %{$self->{deferred}});
-
+
while (@writable) {
# gather all consecutive records from the front of @writable
my $first_rec = shift @writable;
$self->_discard; # clear out defered-write-cache
}
+sub _flush {
+ my $self = shift;
+ my @writable = sort {$a<=>$b} (keys %{$self->{deferred}});
+ my @args;
+ my @adjust;
+
+ while (@writable) {
+ # gather all consecutive records from the front of @writable
+ my $first_rec = shift @writable;
+ my $last_rec = $first_rec+1;
+ ++$last_rec, shift @writable while @writable && $last_rec == $writable[0];
+ --$last_rec;
+ my $end = $self->_fill_offsets_to($last_rec+1);
+ if (not defined $end) {
+ $self->_extend_file_to($last_rec);
+ $end = $self->{offsets}[$last_rec];
+ }
+ my ($start) = $self->{offsets}[$first_rec];
+ push @args,
+ join("", @{$self->{deferred}}{$first_rec .. $last_rec}), # data
+ $start, # position
+ $end-$start; # length
+ push @adjust, [$first_rec, # starting at this position...
+ $last_rec-$first_rec+1, # this many records...
+ # are replaced with these...
+ @{$self->{deferred}}{$first_rec .. $last_rec},
+ ];
+ }
+
+ $self->_mtwrite(@args); # write multiple record groups
+ $self->_discard; # clear out defered-write-cache
+ $self->_oadjust(@adjust);
+}
+
# Discard deferred writes and disable future deferred writes
sub discard {
my $self = shift;
}
}
-# If autodferring was enabled, cut it out and discard the history
+# If autodeferring was enabled, cut it out and discard the history
sub _stop_autodeferring {
my $self = shift;
if ($self->{autodeferring}) {
sub HASH () { 1 }
sub MAX () { 2 }
sub BYTES() { 3 }
+#sub STAT () { 4 } # Array with request statistics for each record
+#sub MISS () { 5 } # Total number of cache misses
+#sub REQ () { 6 } # Total number of cache requests
use strict 'vars';
sub new {
if (defined $n) {
$self->[HASH]{$k} = $n;
} else {
- delete $self->[HASH]{$k};
+ delete $self->[HASH]{$k};
}
}
}
confess "undefined val" unless defined $val;
return if length($val) > $self->[MAX];
+
+# if ($self->[STAT]) {
+# $self->[STAT][$key] = 1;
+# return;
+# }
+
my $oldnode = $self->[HASH]{$key};
if (defined $oldnode) {
my $oldval = $self->[HEAP]->set_val($oldnode, $val);
$self->[HEAP]->insert($key, $val);
}
$self->[BYTES] += length($val);
- $self->flush;
+ $self->flush if $self->[BYTES] > $self->[MAX];
}
sub expire {
sub remove {
my ($self, @keys) = @_;
my @result;
+
+# if ($self->[STAT]) {
+# for my $key (@keys) {
+# $self->[STAT][$key] = 0;
+# }
+# return;
+# }
+
for my $key (@keys) {
next unless exists $self->[HASH]{$key};
my $old_data = $self->[HEAP]->remove($self->[HASH]{$key});
my ($self, $key) = @_;
local *_;
croak "missing argument to ->lookup" unless defined $key;
+
+# if ($self->[STAT]) {
+# $self->[MISS]++ if $self->[STAT][$key]++ == 0;
+# $self->[REQ]++;
+# my $hit_rate = 1 - $self->[MISS] / $self->[REQ];
+# # Do some testing to determine this threshhold
+# $#$self = STAT - 1 if $hit_rate > 0.20;
+# }
+
if (exists $self->[HASH]{$key}) {
$self->[HEAP]->lookup($self->[HASH]{$key});
} else {
%{$self->[HASH]} = ();
$self->[BYTES] = 0;
$self->[HEAP]->empty;
+# @{$self->[STAT]} = ();
+# $self->[MISS] = 0;
+# $self->[REQ] = 0;
}
sub is_empty {
local *_;
croak "missing argument to ->update" unless defined $key;
if (length($val) > $self->[MAX]) {
- my $oldval = $self->remove($key);
+ my ($oldval) = $self->remove($key);
$self->[BYTES] -= length($oldval) if defined $oldval;
} elsif (exists $self->[HASH]{$key}) {
my $oldval = $self->[HEAP]->set_val($self->[HASH]{$key}, $val);
@a;
}
+# Return total amount of cached data
sub bytes {
my $self = shift;
$self->[BYTES];
}
+# Expire oldest item from cache until cache size is smaller than $max
sub reduce_size_to {
my ($self, $max) = @_;
- until ($self->is_empty || $self->[BYTES] <= $max) {
- $self->expire;
+ until ($self->[BYTES] <= $max) {
+ # Note that Tie::File::Cache::expire has been inlined here
+ my $old_data = $self->[HEAP]->popheap;
+ return unless defined $old_data;
+ $self->[BYTES] -= length $old_data;
}
}
+# Why not just $self->reduce_size_to($self->[MAX])?
+# Try this when things stabilize TODO XXX
+# If the cache is too full, expire the oldest records
sub flush {
my $self = shift;
- until ($self->is_empty || $self->[BYTES] <= $self->[MAX]) {
- $self->expire;
- }
+ $self->reduce_size_to($self->[MAX]) if $self->[BYTES] > $self->[MAX];
}
# For internal use only
# Remove the item at node $i from the heap, moving child items upwards.
# The item with the smallest sequence number is always at the top.
# Moving items upwards maintains this condition.
-# Return the removed item.
+# Return the removed item. Return undef if there was no item at node $i.
sub remove {
my ($self, $i) = @_;
$i = 1 unless defined $i;
"Cogito, ergo sum."; # don't forget to return a true value from the file
+__END__
+
=head1 NAME
Tie::File - Access the lines of a disk file via a Perl array
=head1 SYNOPSIS
- # This file documents Tie::File version 0.93
+ # This file documents Tie::File version 0.95
+ use Tie::File;
tie @array, 'Tie::File', filename or die ...;
push @array, new recs...;
my $r1 = pop @array;
unshift @array, new recs...;
- my $r1 = shift @array;
+ my $r2 = shift @array;
@old_recs = splice @array, 3, 7, new recs...;
untie @array; # all finished
What is a 'record'? By default, the meaning is the same as for the
C<E<lt>...E<gt>> operator: It's a string terminated by C<$/>, which is
-probably C<"\n">. (Minor exception: on dos and Win32 systems, a
+probably C<"\n">. (Minor exception: on DOS and Win32 systems, a
'record' is a string terminated by C<"\r\n">.) You may change the
definition of "record" by supplying the C<recsep> option in the C<tie>
call:
The C<memory> value is not an absolute or exact limit on the memory
used. C<Tie::File> objects contains some structures besides the read
cache and the deferred write buffer, whose sizes are not charged
-against C<memory>.
+against C<memory>.
+
+The cache itself consumes about 310 bytes per cached record, so if
+your file has many short records, you may want to decrease the cache
+memory limit, or else the cache overhead may exceed the size of the
+cached data.
+
=head2 C<dw_size>
C<MODE> is optional; the default is C<LOCK_EX>.
+C<Tie::File> maintains an internal table of the byte offset of each
+record it has seen in the file.
+
+When you use C<flock> to lock the file, C<Tie::File> assumes that the
+read cache is no longer trustworthy, because another process might
+have modified the file since the last time it was read. Therefore, a
+successful call to C<flock> discards the contents of the read cache
+and the internal record offset table.
+
C<Tie::File> promises that the following sequence of operations will
be safe:
See L<"Deferred Writing">, below.
+=head2 C<offset>
+
+ $off = $o->offset($n);
+
+This method returns the byte offset of the start of the C<$n>th record
+in the file. If there is no such record, it returns an undefined
+value.
+
=head1 Tying to an already-opened filehandle
If C<$fh> is a filehandle, such as is returned by C<IO::File> or one
Similarly, C<-E<gt>autodefer(1)> re-enables autodeferment, and
C<-E<gt>autodefer()> recovers the current value of the autodefer setting.
-=head1 CAVEATS
-(That's Latin for 'warnings'.)
+=head1 CONCURRENT ACCESS TO FILES
-=over 4
+Caching and deferred writing are inappropriate if you want the same
+file to be accessed simultaneously from more than one process. You
+will want to disable these features. You should do that by including
+the C<memory =E<gt> 0> option in your C<tie> calls; this will inhibit
+caching and deferred writing.
-=item *
+You will also want to lock the file while reading or writing it. You
+can use the C<-E<gt>flock> method for this. A future version of this
+module may provide an 'autolocking' mode.
+
+=head1 CAVEATS
-This is BETA RELEASE SOFTWARE. It may have bugs. See the discussion
-below about the (lack of any) warranty.
+(That's Latin for 'warnings'.)
-In particular, this means that the interface may change in
-incompatible ways from one version to the next, without warning. That
-has happened at least once already. The interface will freeze before
-Perl 5.8 is released, probably sometime in April 2002.
+=over 4
=item *
=item *
-Not quite every effort was made to make this module as efficient as
-possible. C<FETCHSIZE> should use binary search instead of linear
-search.
-
-The performance of the C<flush> method could be improved. At present,
-it still rewrites the tail of the file once for each block of
-contiguous lines to be changed. In the typical case, this will result
-in only one rewrite, but in peculiar cases it might be bad. It should
-be possible to perform I<all> deferred writing with a single rewrite.
-
-Profiling suggests that these defects are probably minor; in any
-event, they will be fixed in a future version of the module.
-
-=item *
-
I have supposed that since this module is concerned with file I/O,
almost all normal use of it will be heavily I/O bound. This means
that the time to maintain complicated data structures inside the
module will be dominated by the time to actually perform the I/O.
When there was an opportunity to spend CPU time to avoid doing I/O, I
-tried to take it.
+usually tried to take it.
=item *
transactions, with C<flush> as C<commit> and C<discard> as
C<rollback>, but it isn't, so don't.
+=item *
+
+There is a large memory overhead for each record offset and for each
+cache entry: about 310 bytes per cached data record, and about 21 bytes per offset table entry.
+
+The per-record overhead will limit the maximum number of records you
+can access per file. Note that I<accessing> the length of the array
+via C<$x = scalar @tied_file> accesses B<all> records and stores their
+offsets. The same for C<foreach (@tied_file)>, even if you exit the
+loop early.
+
=back
=head1 SUBCLASSING
=head1 LICENSE
-C<Tie::File> version 0.93 is copyright (C) 2002 Mark Jason Dominus.
+C<Tie::File> version 0.95 is copyright (C) 2002 Mark Jason Dominus.
This library is free software; you may redistribute it and/or modify
it under the same terms as Perl itself.
=head1 WARRANTY
-C<Tie::File> version 0.93 comes with ABSOLUTELY NO WARRANTY.
+C<Tie::File> version 0.95 comes with ABSOLUTELY NO WARRANTY.
For details, see the license.
=head1 THANKS
the call of duty), Michael G Schwern (for testing advice), and the
rest of the CPAN testers (for testing generally).
+Special thanks to Tels for suggesting several speed and memory
+optimizations.
+
Additional thanks to:
Edward Avis /
+Mattia Barbon /
Gerrit Haase /
+Jarkko Hietaniemi (again) /
Nikola Knezevic /
+John Kominetz /
Nick Ing-Simmons /
Tassilo von Parseval /
H. Dieter Pearcey /
Slaven Rezic /
+Eric Roode /
Peter Scott /
Peter Somu /
Autrijus Tang (again) /
-Tels /
-Juerd Wallboer
+Tels (again) /
+Juerd Waalboer
=head1 TODO
-More tests. (The cache and heap modules need more unit tests.)
-
-Improve SPLICE algorithm to use deferred writing machinery.
-
-Cleverer strategy for flushing deferred writes.
-
More tests. (Stuff I didn't think of yet.)
Paragraph mode?
Maybe an autolocking mode?
+For many common uses of the module, the read cache is a liability.
+For example, a program that inserts a single record, or that scans the
+file once, will have a cache hit rate of zero. This suggests a major
+optimization: The cache should be initially disabled. Here's a hybrid
+approach: Initially, the cache is disabled, but the cache code
+maintains statistics about how high the hit rate would be *if* it were
+enabled. When it sees the hit rate get high enough, it enables
+itself. The STAT comments in this code are the beginning of an
+implementation of this.
+
Record locking with fcntl()? Then the module might support an undo
log and get real transactions. What a tour de force that would be.
+Keeping track of the highest cached record. This would allow reads-in-a-row
+to skip the cache lookup faster (if reading from 1..N with empty cache at
+start, the last cached value will be always N-1).
+
More tests.
=cut
print "1..1\n";
-my $testversion = "0.93";
+my $testversion = "0.95";
use Tie::File;
if ($Tie::File::VERSION != $testversion) {
}
print "ok 1\n";
+
#!/usr/bin/perl
+$| = 1;
my $file = "tf$$.txt";
+1 while unlink $file;
print "1..75\n";
# contents.
+$| = 1;
my $file = "tf$$.txt";
$: = Tie::File::_default_recsep();
my $data = "rec0$:rec1$:rec2$:";
$N++;
push @a, "next";
check_contents($badrec, "next");
- undef $o; untie @a;
}
# (51-52)
if (setup_badly_terminated_file(2)) {
or die "Couldn't tie file: $!";
splice @a, 1, 0, "x", "y";
check_contents($badrec, "x", "y");
- undef $o; untie @a;
}
# (53-56)
if (setup_badly_terminated_file(4)) {
: "not ok $N \# expected <$badrec>, got <$r[0]>\n";
$N++;
check_contents("x", "y");
- undef $o; untie @a;
}
# (57-58) 20020402 The modifiaction would have failed if $\ were set wrong.
my $z = $a[0];
}
check_contents($badrec);
- undef $o; untie @a;
}
sub setup_badly_terminated_file {
untie @a;
# (39) Does it correctly detect a non-seekable handle?
-{ if ($^O =~ /^(MSWin32|dos|beos)$/) {
+{ if ($^O =~ /^(MSWin32|dos|BeOS)$/) {
print "ok $N # skipped ($^O has broken pipe semantics)\n";
last;
}
# Tests for various caching errors
#
+$|=1;
my $file = "tf$$.txt";
$: = Tie::File::_default_recsep();
my $data = join $:, "rec0" .. "rec9", "";
my $V = $ENV{INTEGRITY}; # Verbose integrity checking?
-print "1..54\n";
+print "1..55\n";
my $N = 1;
use Tie::File;
splice @a;
check();
+# (55) This was broken on 20030507 when you moved the cache management
+# stuff out of _oadjust back into _splice without also putting it back
+# into _store.
+@a = (0..11);
+check();
sub init_file {
my $data = shift;
my $file = "tf$$.txt";
-unless ($^O =~ /^(MSWin32)$/) {
+unless ($^O =~ /^(MSWin32|dos)$/) {
print "1..0\n";
exit;
}
# Regular read-write tests with caching disabled
# (Same as 01_gen.t)
#
-
my $file = "tf$$.txt";
print "1..68\n";
# The record has exactly 17 characters. This will help ensure that
# even if _twrite screws up, the data doesn't coincidentally
# look good because the remainder accidentally lines up.
- my $d = length($:) == 1 ? "0123456789abcdef$:" : "0123456789abcde$:";
+ my $d = substr("0123456789abcdef$:", -17);
my $recs = defined($FLEN) ?
int($FLEN/length($d))+1 : # enough to make up at least $FLEN
int(8192*5/length($d))+1; # at least 5 blocks' worth
--- /dev/null
+#!/usr/bin/perl
+#
+# Unit tests of _iwrite function
+#
+# _iwrite($self, $data, $start, $end)
+#
+# 'i' here is for 'insert'. This writes $data at absolute position $start
+# in the file, copying the data at that position downwards---
+# but only down to position $end. Data at or past $end is not moved
+# or even examined. Since there isn't enough room for the full copy
+# (Because we inserted $data at the beginning) we copy as much as possible
+# and return a string containing the remainder.
+
+my $file = "tf$$.txt";
+$| = 1;
+
+print "1..203\n";
+
+my $N = 1;
+my $oldfile;
+use Tie::File;
+print "ok $N\n"; $N++;
+
+$: = Tie::File::_default_recsep();
+
+$FLEN = 40970; # Use files of this length
+$oldfile = mkrand($FLEN);
+print "# MOF tests\n";
+# (2-85) These were generated by 'gentests.pl' to cover all possible cases
+# (I hope)
+# Legend:
+# x: data is entirely contained within one block
+# x>: data runs from the middle to the end of the block
+# <x: data runs from the start to the middle of the block
+# <x>: data occupies precisely one block
+# x><x: data overlaps one block boundary
+# <x><x: data runs from the start of one block into the middle of the next
+# x><x>: data runs from the middle of one block to the end of the next
+# <x><x>: data occupies two blocks exactly
+# <x><x><x>: data occupies three blocks exactly
+# 0: data is null
+#
+# For each possible alignment of the old and new data, we investigate
+# up to three situations: old data is shorter, old and new data are the
+# same length, and new data is shorter.
+#
+# try($pos, $old, $new) means to run a test where the area being
+# written into starts at position $pos, the area being written into
+# has length $old, and and the new data has length $new.
+try( 8605, 2394, 2394); # old=x , new=x ; old = new
+try( 9768, 1361, 664); # old=x , new=x ; old > new
+try( 9955, 6429, 6429); # old=x> , new=x ; old = new
+try(10550, 5834, 4123); # old=x> , new=x ; old > new
+try(14580, 6158, 851); # old=x><x , new=x ; old > new
+try(13442, 11134, 1572); # old=x><x> , new=x ; old > new
+try( 8192, 514, 514); # old=<x , new=<x ; old = new
+try( 8192, 2196, 858); # old=<x , new=<x ; old > new
+try( 8192, 8192, 8192); # old=<x> , new=<x ; old = new
+try( 8192, 8192, 1290); # old=<x> , new=<x ; old > new
+try( 8192, 10575, 6644); # old=<x><x , new=<x ; old > new
+try( 8192, 16384, 5616); # old=<x><x> , new=<x ; old > new
+try( 8192, 24576, 6253); # old=<x><x><x>, new=<x ; old > new
+try( 9965, 6419, 6419); # old=x> , new=x> ; old = new
+try(16059, 6102, 325); # old=x><x , new=x> ; old > new
+try( 9503, 15073, 6881); # old=x><x> , new=x> ; old > new
+try(16316, 1605, 1605); # old=x><x , new=x><x ; old = new
+try(16093, 4074, 993); # old=x><x , new=x><x ; old > new
+try(14739, 9837, 9837); # old=x><x> , new=x><x ; old = new
+try(14071, 10505, 7344); # old=x><x> , new=x><x ; old > new
+try( 8192, 8192, 8192); # old=<x> , new=<x> ; old = new
+try( 8192, 14817, 8192); # old=<x><x , new=<x> ; old > new
+try( 8192, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try( 8192, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try( 8192, 9001, 9001); # old=<x><x , new=<x><x ; old = new
+try( 8192, 11760, 10274); # old=<x><x , new=<x><x ; old > new
+try( 8192, 16384, 10781); # old=<x><x> , new=<x><x ; old > new
+try( 8192, 24576, 9284); # old=<x><x><x>, new=<x><x ; old > new
+try(14761, 9815, 9815); # old=x><x> , new=x><x> ; old = new
+try( 8192, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try( 8192, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try( 8192, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try( 8771, 776, 0); # old=x , new=0 ; old > new
+try( 8192, 2813, 0); # old=<x , new=0 ; old > new
+try(13945, 2439, 0); # old=x> , new=0 ; old > new
+try(14493, 6090, 0); # old=x><x , new=0 ; old > new
+try( 8192, 8192, 0); # old=<x> , new=0 ; old > new
+try( 8192, 10030, 0); # old=<x><x , new=0 ; old > new
+try(14983, 9593, 0); # old=x><x> , new=0 ; old > new
+try( 8192, 16384, 0); # old=<x><x> , new=0 ; old > new
+try( 8192, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try(10489, 0, 0); # old=0 , new=0 ; old = new
+
+print "# SOF tests\n";
+# (86-133)
+# These tests all take place at the start of the file
+try( 0, 4868, 4868); # old=<x , new=<x ; old = new
+try( 0, 147, 118); # old=<x , new=<x ; old > new
+try( 0, 8192, 8192); # old=<x> , new=<x ; old = new
+try( 0, 8192, 4574); # old=<x> , new=<x ; old > new
+try( 0, 11891, 1917); # old=<x><x , new=<x ; old > new
+try( 0, 16384, 5155); # old=<x><x> , new=<x ; old > new
+try( 0, 24576, 2953); # old=<x><x><x>, new=<x ; old > new
+try( 0, 8192, 8192); # old=<x> , new=<x> ; old = new
+try( 0, 11083, 8192); # old=<x><x , new=<x> ; old > new
+try( 0, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try( 0, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try( 0, 14126, 14126); # old=<x><x , new=<x><x ; old = new
+try( 0, 12002, 9034); # old=<x><x , new=<x><x ; old > new
+try( 0, 16384, 13258); # old=<x><x> , new=<x><x ; old > new
+try( 0, 24576, 14367); # old=<x><x><x>, new=<x><x ; old > new
+try( 0, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try( 0, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try( 0, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try( 0, 6530, 0); # old=<x , new=0 ; old > new
+try( 0, 8192, 0); # old=<x> , new=0 ; old > new
+try( 0, 14707, 0); # old=<x><x , new=0 ; old > new
+try( 0, 16384, 0); # old=<x><x> , new=0 ; old > new
+try( 0, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try( 0, 0, 0); # old=0 , new=0 ; old = new
+
+print "# EOF tests 1\n";
+# (134-169)
+# These tests all take place at the end of the file
+$FLEN = 40960; # Force the file to be exactly 40960 bytes long
+$oldfile = mkrand($FLEN);
+try(32768, 8192, 8192); # old=<x> , new=<x ; old = new
+try(32768, 8192, 4026); # old=<x> , new=<x ; old > new
+try(24576, 16384, 1917); # old=<x><x> , new=<x ; old > new
+try(16384, 24576, 3818); # old=<x><x><x>, new=<x ; old > new
+try(32768, 8192, 8192); # old=<x> , new=<x> ; old = new
+try(24576, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try(16384, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try(24576, 16384, 12221); # old=<x><x> , new=<x><x ; old > new
+try(16384, 24576, 15030); # old=<x><x><x>, new=<x><x ; old > new
+try(24576, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try(16384, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try(16384, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try(35973, 4987, 0); # old=x> , new=0 ; old > new
+try(32768, 8192, 0); # old=<x> , new=0 ; old > new
+try(29932, 11028, 0); # old=x><x> , new=0 ; old > new
+try(24576, 16384, 0); # old=<x><x> , new=0 ; old > new
+try(16384, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try(40960, 0, 0); # old=0 , new=0 ; old = new
+
+print "# EOF tests 2\n";
+# (170-203)
+# These tests all take place at the end of the file
+$FLEN = 42000; # Force the file to be exactly 42000 bytes long
+$oldfile = mkrand($FLEN);
+try(41683, 317, 317); # old=x , new=x ; old = new
+try(41225, 775, 405); # old=x , new=x ; old > new
+try(35709, 6291, 284); # old=x><x , new=x ; old > new
+try(40960, 1040, 1040); # old=<x , new=<x ; old = new
+try(40960, 1040, 378); # old=<x , new=<x ; old > new
+try(32768, 9232, 5604); # old=<x><x , new=<x ; old > new
+try(39994, 2006, 966); # old=x><x , new=x> ; old > new
+try(36725, 5275, 5275); # old=x><x , new=x><x ; old = new
+try(37990, 4010, 3199); # old=x><x , new=x><x ; old > new
+try(32768, 9232, 8192); # old=<x><x , new=<x> ; old > new
+try(32768, 9232, 9232); # old=<x><x , new=<x><x ; old = new
+try(32768, 9232, 8795); # old=<x><x , new=<x><x ; old > new
+try(41500, 500, 0); # old=x , new=0 ; old > new
+try(40960, 1040, 0); # old=<x , new=0 ; old > new
+try(35272, 6728, 0); # old=x><x , new=0 ; old > new
+try(32768, 9232, 0); # old=<x><x , new=0 ; old > new
+try(42000, 0, 0); # old=0 , new=0 ; old = new
+
+sub mkrand {
+ my $len = shift;
+ srand $len;
+ my @c = ('a' .. 'z', 'A' .. 'Z', 0..9, $:);
+ my $d = "";
+ $d .= $c[rand @c] until length($d) >= $len;
+ substr($d, $len) = ""; # chop it off to the proper length
+ $d;
+}
+
+sub try {
+ my ($s, $len, $newlen) = @_;
+ my $e = $s + $len;
+
+ open F, "> $file" or die "Couldn't open file $file: $!";
+ binmode F;
+
+ print F $oldfile;
+ close F;
+
+ die "wrong length!" unless -s $file == $FLEN;
+
+ my $newdata = "-" x $newlen;
+ my $expected = $oldfile;
+
+ my $expected_return = substr($expected, $e - $newlen, $newlen, "");
+ substr($expected, $s, 0, $newdata);
+
+ my $o = tie my @lines, 'Tie::File', $file or die $!;
+ my $actual_return = $o->_iwrite($newdata, $s, $e);
+ undef $o; untie @lines;
+
+ open F, "< $file" or die "Couldn't open file $file: $!";
+ binmode F;
+ my $actual;
+ { local $/;
+ $actual = <F>;
+ }
+ close F;
+
+ my ($alen, $xlen) = (length $actual, length $expected);
+ unless ($alen == $xlen) {
+ print "# try(@_) expected file length $xlen, actual $alen!\n";
+ }
+ print $actual eq $expected ? "ok $N\n" : "not ok $N\n";
+ $N++;
+
+ if (! defined $actual_return && ! defined $expected_return) {
+ print "ok $N\n";
+ } elsif (! defined $actual_return || ! defined $expected_return) {
+ print "not ok $N\n";
+ } else {
+ print $actual_return eq $expected_return ? "ok $N\n" : "not ok $N\n";
+ }
+ $N++;
+}
+
+sub ctrlfix {
+ for (@_) {
+ s/\n/\\n/g;
+ s/\r/\\r/g;
+ }
+}
+
+END {
+ 1 while unlink $file;
+}
+
--- /dev/null
+#!/usr/bin/perl
+#
+# Unit tests of _mtwrite function
+#
+# _mtwrite($self, $d1, $s1, $l1, $d2, $s2, $l2, ...)
+#
+# 'm' here is for 'multiple'. This writes data $d1 at position $s1
+# over a block of space $l1, moving subsequent data up or down as necessary.
+
+my $file = "tf$$.txt";
+$| = 1;
+
+print "1..2252\n";
+
+my $N = 1;
+my $oldfile;
+use Tie::File;
+print "ok $N\n"; $N++;
+
+$: = Tie::File::_default_recsep();
+
+# Only these are used for the triple-region tests
+@BASE_TRIES = (
+ [10, 20, 30],
+ [10, 30, 20],
+ [100, 30, 20],
+ [100, 20, 30],
+ [100, 40, 20],
+ [100, 20, 40],
+ [200, 20, 30],
+ [200, 30, 20],
+ [200, 20, 60],
+ [200, 60, 20],
+ );
+
+@TRIES = @BASE_TRIES;
+
+$FLEN = 40970; # Use files of this length
+$oldfile = mkrand($FLEN);
+print "# MOF tests\n";
+# These were generated by 'gentests.pl' to cover all possible cases
+# (I hope)
+# Legend:
+# x: data is entirely contained within one block
+# x>: data runs from the middle to the end of the block
+# <x: data runs from the start to the middle of the block
+# <x>: data occupies precisely one block
+# x><x: data overlaps one block boundary
+# <x><x: data runs from the start of one block into the middle of the next
+# x><x>: data runs from the middle of one block to the end of the next
+# <x><x>: data occupies two blocks exactly
+# <x><x><x>: data occupies three blocks exactly
+# 0: data is null
+#
+# For each possible alignment of the old and new data, we investigate
+# up to three situations: old data is shorter, old and new data are the
+# same length, and new data is shorter.
+#
+# try($pos, $old, $new) means to run a test where the area being
+# written into starts at position $pos, the area being written into
+# has length $old, and and the new data has length $new.
+try( 8605, 2394, 2394); # old=x , new=x ; old = new
+try( 9768, 1361, 664); # old=x , new=x ; old > new
+try( 9955, 6429, 6429); # old=x> , new=x ; old = new
+try(10550, 5834, 4123); # old=x> , new=x ; old > new
+try(14580, 6158, 851); # old=x><x , new=x ; old > new
+try(13442, 11134, 1572); # old=x><x> , new=x ; old > new
+try( 8192, 514, 514); # old=<x , new=<x ; old = new
+try( 8192, 2196, 858); # old=<x , new=<x ; old > new
+try( 8192, 8192, 8192); # old=<x> , new=<x ; old = new
+try( 8192, 8192, 1290); # old=<x> , new=<x ; old > new
+try( 8192, 10575, 6644); # old=<x><x , new=<x ; old > new
+try( 8192, 16384, 5616); # old=<x><x> , new=<x ; old > new
+try( 8192, 24576, 6253); # old=<x><x><x>, new=<x ; old > new
+try( 9965, 6419, 6419); # old=x> , new=x> ; old = new
+try(16059, 6102, 325); # old=x><x , new=x> ; old > new
+try( 9503, 15073, 6881); # old=x><x> , new=x> ; old > new
+try(16316, 1605, 1605); # old=x><x , new=x><x ; old = new
+try(16093, 4074, 993); # old=x><x , new=x><x ; old > new
+try(14739, 9837, 9837); # old=x><x> , new=x><x ; old = new
+try(14071, 10505, 7344); # old=x><x> , new=x><x ; old > new
+try( 8192, 8192, 8192); # old=<x> , new=<x> ; old = new
+try( 8192, 14817, 8192); # old=<x><x , new=<x> ; old > new
+try( 8192, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try( 8192, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try( 8192, 9001, 9001); # old=<x><x , new=<x><x ; old = new
+try( 8192, 11760, 10274); # old=<x><x , new=<x><x ; old > new
+try( 8192, 16384, 10781); # old=<x><x> , new=<x><x ; old > new
+try( 8192, 24576, 9284); # old=<x><x><x>, new=<x><x ; old > new
+try(14761, 9815, 9815); # old=x><x> , new=x><x> ; old = new
+try( 8192, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try( 8192, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try( 8192, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try( 8771, 776, 0); # old=x , new=0 ; old > new
+try( 8192, 2813, 0); # old=<x , new=0 ; old > new
+try(13945, 2439, 0); # old=x> , new=0 ; old > new
+try(14493, 6090, 0); # old=x><x , new=0 ; old > new
+try( 8192, 8192, 0); # old=<x> , new=0 ; old > new
+try( 8192, 10030, 0); # old=<x><x , new=0 ; old > new
+try(14983, 9593, 0); # old=x><x> , new=0 ; old > new
+try( 8192, 16384, 0); # old=<x><x> , new=0 ; old > new
+try( 8192, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try(10489, 0, 0); # old=0 , new=0 ; old = new
+
+print "# SOF tests\n";
+# These tests all take place at the start of the file
+try( 0, 4868, 4868); # old=<x , new=<x ; old = new
+try( 0, 147, 118); # old=<x , new=<x ; old > new
+try( 0, 8192, 8192); # old=<x> , new=<x ; old = new
+try( 0, 8192, 4574); # old=<x> , new=<x ; old > new
+try( 0, 11891, 1917); # old=<x><x , new=<x ; old > new
+try( 0, 16384, 5155); # old=<x><x> , new=<x ; old > new
+try( 0, 24576, 2953); # old=<x><x><x>, new=<x ; old > new
+try( 0, 8192, 8192); # old=<x> , new=<x> ; old = new
+try( 0, 11083, 8192); # old=<x><x , new=<x> ; old > new
+try( 0, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try( 0, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try( 0, 14126, 14126); # old=<x><x , new=<x><x ; old = new
+try( 0, 12002, 9034); # old=<x><x , new=<x><x ; old > new
+try( 0, 16384, 13258); # old=<x><x> , new=<x><x ; old > new
+try( 0, 24576, 14367); # old=<x><x><x>, new=<x><x ; old > new
+try( 0, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try( 0, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try( 0, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try( 0, 6530, 0); # old=<x , new=0 ; old > new
+try( 0, 8192, 0); # old=<x> , new=0 ; old > new
+try( 0, 14707, 0); # old=<x><x , new=0 ; old > new
+try( 0, 16384, 0); # old=<x><x> , new=0 ; old > new
+try( 0, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try( 0, 0, 0); # old=0 , new=0 ; old = new
+
+print "# EOF tests 1\n";
+# These tests all take place at the end of the file
+$FLEN = 40960; # Force the file to be exactly 40960 bytes long
+$oldfile = mkrand($FLEN);
+try(32768, 8192, 8192); # old=<x> , new=<x ; old = new
+try(32768, 8192, 4026); # old=<x> , new=<x ; old > new
+try(24576, 16384, 1917); # old=<x><x> , new=<x ; old > new
+try(16384, 24576, 3818); # old=<x><x><x>, new=<x ; old > new
+try(32768, 8192, 8192); # old=<x> , new=<x> ; old = new
+try(24576, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try(16384, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try(24576, 16384, 12221); # old=<x><x> , new=<x><x ; old > new
+try(16384, 24576, 15030); # old=<x><x><x>, new=<x><x ; old > new
+try(24576, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try(16384, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try(16384, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try(35973, 4987, 0); # old=x> , new=0 ; old > new
+try(32768, 8192, 0); # old=<x> , new=0 ; old > new
+try(29932, 11028, 0); # old=x><x> , new=0 ; old > new
+try(24576, 16384, 0); # old=<x><x> , new=0 ; old > new
+try(16384, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try(40960, 0, 0); # old=0 , new=0 ; old = new
+
+print "# EOF tests 2\n";
+# These tests all take place at the end of the file
+$FLEN = 42000; # Force the file to be exactly 42000 bytes long
+$oldfile = mkrand($FLEN);
+try(41683, 317, 317); # old=x , new=x ; old = new
+try(41225, 775, 405); # old=x , new=x ; old > new
+try(35709, 6291, 284); # old=x><x , new=x ; old > new
+try(40960, 1040, 1040); # old=<x , new=<x ; old = new
+try(40960, 1040, 378); # old=<x , new=<x ; old > new
+try(32768, 9232, 5604); # old=<x><x , new=<x ; old > new
+try(39994, 2006, 966); # old=x><x , new=x> ; old > new
+try(36725, 5275, 5275); # old=x><x , new=x><x ; old = new
+try(37990, 4010, 3199); # old=x><x , new=x><x ; old > new
+try(32768, 9232, 8192); # old=<x><x , new=<x> ; old > new
+try(32768, 9232, 9232); # old=<x><x , new=<x><x ; old = new
+try(32768, 9232, 8795); # old=<x><x , new=<x><x ; old > new
+try(41500, 500, 0); # old=x , new=0 ; old > new
+try(40960, 1040, 0); # old=<x , new=0 ; old > new
+try(35272, 6728, 0); # old=x><x , new=0 ; old > new
+try(32768, 9232, 0); # old=<x><x , new=0 ; old > new
+try(42000, 0, 0); # old=0 , new=0 ; old = new
+
+# Now the REAL tests
+# Make sure mtwrite can properly write sequences of several intervals
+# The intervals tested above were accumulated into @TRIES.
+# try_all_doubles() tries every possible sensible pair of those intervals.
+# try_all_triples() tries every possible sensible group of
+# tree intervals from the more restrictive set @BASE_TRIES.
+$FLEN = 40970;
+$oldfile = mkrand($FLEN);
+try_all_doubles();
+try_all_triples();
+
+sub mkrand {
+ my $len = shift;
+ srand $len;
+ my @c = ('a' .. 'z', 'A' .. 'Z', 0..9, $:);
+ my $d = "";
+ $d .= $c[rand @c] until length($d) >= $len;
+ substr($d, $len) = ""; # chop it off to the proper length
+ $d;
+}
+
+sub try {
+ push @TRIES, [@_] if @_ == 3;
+
+ open F, "> $file" or die "Couldn't open file $file: $!";
+ binmode F;
+ print F $oldfile;
+ close F;
+ die "wrong length!" unless -s $file == $FLEN;
+
+ my @mt_args;
+ my $expected = $oldfile;
+ { my @a = @_;
+ my $c = "a";
+ while (@a) {
+ my ($s, $len, $newlen) = splice @a, -3;
+ my $newdata = $c++ x $newlen;
+ substr($expected, $s, $len, $newdata);
+ unshift @mt_args, $newdata, $s, $len;
+ }
+ }
+
+ my $o = tie my @lines, 'Tie::File', $file or die $!;
+ my $actual_return = $o->_mtwrite(@mt_args);
+ undef $o; untie @lines;
+
+ open F, "< $file" or die "Couldn't open file $file: $!";
+ binmode F;
+ my $actual;
+ { local $/;
+ $actual = <F>;
+ }
+ close F;
+
+ my ($alen, $xlen) = (length $actual, length $expected);
+ unless ($alen == $xlen) {
+ print "# try(@_) expected file length $xlen, actual $alen!\n";
+ }
+ print $actual eq $expected ? "ok $N\n" : "not ok $N\n";
+ $N++;
+
+# if (! defined $actual_return && ! defined $expected_return) {
+# print "ok $N\n";
+# } elsif (! defined $actual_return || ! defined $expected_return) {
+# print "not ok $N\n";
+# } else {
+# print $actual_return eq $expected_return ? "ok $N\n" : "not ok $N\n";
+# }
+# $N++;
+}
+
+sub try_all_doubles {
+ print "# Trying double regions.\n";
+ for my $a (@TRIES) {
+ next if $a->[0] + $a->[1] >= $FLEN;
+ next if $a->[0] + $a->[2] >= $FLEN;
+ for my $b (@TRIES) {
+ next if $b->[0] + $b->[1] >= $FLEN;
+ next if $b->[0] + $b->[2] >= $FLEN;
+
+ next if $b->[0] < $a->[0] + $a->[1]; # Overlapping regions
+ try(@$a, @$b);
+ }
+ }
+}
+
+sub try_all_triples {
+ print "# Trying triple regions.\n";
+ for my $a (@BASE_TRIES) {
+ next if $a->[0] + $a->[1] >= $FLEN;
+ next if $a->[0] + $a->[2] >= $FLEN;
+ for my $b (@BASE_TRIES) {
+ next if $b->[0] + $b->[1] >= $FLEN;
+ next if $b->[0] + $b->[2] >= $FLEN;
+
+ next if $b->[0] < $a->[0] + $a->[1]; # Overlapping regions
+
+ for my $c (@BASE_TRIES) {
+ next if $c->[0] + $c->[1] >= $FLEN;
+ next if $c->[0] + $c->[2] >= $FLEN;
+
+ next if $c->[0] < $b->[0] + $b->[1]; # Overlapping regions
+ try(@$a, @$b, @$c);
+ }
+ }
+ }
+}
+
+# Each element of @TRIES has [start, oldlen, newlen]
+# Try them pairwise
+sub xxtry_all_doubles {
+ print "# Trying double regions.\n";
+ my %reg; # regions
+ for my $i (0 .. $#TRIES) {
+ $a = $TRIES[$i];
+ ($reg{a}{st}, $reg{a}{ol}, $reg{a}{nl}) = @{$TRIES[$i]};
+ next if $reg{a}{st} + $reg{a}{ol} >= $FLEN;
+ next if $reg{a}{st} + $reg{a}{nl} >= $FLEN;
+ for my $j (0 .. $#TRIES){
+ $b = $TRIES[$j];
+ ($reg{b}{st}, $reg{b}{ol}, $reg{b}{nl}) = @{$TRIES[$j]};
+ next if $reg{b}{st} + $reg{b}{ol} >= $FLEN;
+ next if $reg{b}{st} + $reg{b}{nl} >= $FLEN;
+
+ next if $reg{b}{st} < $reg{a}{st} + $reg{a}{ol}; # Overlapping regions
+# $reg{b}{st} -= $reg{a}{ol} - $reg{a}{nl};
+
+ open F, "> $file" or die "Couldn't open file $file: $!";
+ binmode F;
+ print F $oldfile;
+ close F;
+ die "wrong length!" unless -s $file == $FLEN;
+
+ my $expected = $oldfile;
+ for ('b', 'a') {
+ $reg{$_}{nd} = $_ x $reg{$_}{nl};
+ substr($expected, $reg{$_}{st}, $reg{$_}{ol}, $reg{$_}{nd});
+ }
+
+ my $o = tie my @lines, 'Tie::File', $file or die $!;
+ $o->_mtwrite($reg{a}{nd}, $reg{a}{st}, $reg{a}{ol},
+ $reg{b}{nd}, $reg{b}{st}, $reg{b}{ol},
+ );
+ undef $o; untie @lines;
+
+ open F, "< $file" or die "Couldn't open file $file: $!";
+ binmode F;
+ my $actual;
+ { local $/;
+ $actual = <F>;
+ }
+ close F;
+
+ my ($alen, $xlen) = (length $actual, length $expected);
+ print "# try_all_doubles(@$a, @$b)\n";
+ unless ($alen == $xlen) {
+ print "# expected file length $xlen, actual $alen!\n";
+ }
+ print $actual eq $expected ? "ok $N\n" : "not ok $N\n";
+ $N++;
+ }
+ }
+}
+
+sub ctrlfix {
+ for (@_) {
+ s/\n/\\n/g;
+ s/\r/\\r/g;
+ }
+}
+
+END {
+ 1 while unlink $file;
+}
+
--- /dev/null
+#!/usr/bin/perl
+#
+# Unit tests of _twrite function
+#
+# _downcopy($self, $data, $pos, $len)
+# Write $data into a block of length $len at position $pos,
+# moving everything in the block forwards to make room.
+# Instead of writing the last length($data) bytes from the block
+# (because there isn't room for them any longer) return them.
+#
+#
+
+my $file = "tf$$.txt";
+
+print "1..718\n";
+
+my $N = 1;
+use Tie::File;
+print "ok $N\n"; $N++;
+
+$: = Tie::File::_default_recsep();
+
+my @subtests = qw(x <x x> x><x <x> <x><x x><x> <x><x> <x><x><x> 0);
+print "ok $N\n"; $N++;
+
+# (3-144) These were generated by 'gentests.pl' to cover all possible cases
+# (I hope)
+# Legend:
+# x: data is entirely contained within one block
+# x>: data runs from the middle to the end of the block
+# <x: data runs from the start to the middle of the block
+# <x>: data occupies precisely one block
+# x><x: data overlaps one block boundary
+# <x><x: data runs from the start of one block into the middle of the next
+# x><x>: data runs from the middle of one block to the end of the next
+# <x><x>: data occupies two blocks exactly
+# <x><x><x>: data occupies three blocks exactly
+# 0: data is null
+#
+# For each possible alignment of the old and new data, we investigate
+# up to three situations: old data is shorter, old and new data are the
+# same length, and new data is shorter.
+#
+# try($pos, $old, $new) means to run a test where the data starts at
+# position $pos, the old data has length $old,
+# and the new data has length $new.
+try( 9659, 6635, 6691); # old=x , new=x ; old < new
+try( 8605, 2394, 2394); # old=x , new=x ; old = new
+try( 9768, 1361, 664); # old=x , new=x ; old > new
+try( 9955, 6429, 6429); # old=x> , new=x ; old = new
+try(10550, 5834, 4123); # old=x> , new=x ; old > new
+try(14580, 6158, 851); # old=x><x , new=x ; old > new
+try(13442, 11134, 1572); # old=x><x> , new=x ; old > new
+try( 8394, 0, 5742); # old=0 , new=x ; old < new
+try( 8192, 2819, 6738); # old=<x , new=<x ; old < new
+try( 8192, 514, 514); # old=<x , new=<x ; old = new
+try( 8192, 2196, 858); # old=<x , new=<x ; old > new
+try( 8192, 8192, 8192); # old=<x> , new=<x ; old = new
+try( 8192, 8192, 1290); # old=<x> , new=<x ; old > new
+try( 8192, 10575, 6644); # old=<x><x , new=<x ; old > new
+try( 8192, 16384, 5616); # old=<x><x> , new=<x ; old > new
+try( 8192, 24576, 6253); # old=<x><x><x>, new=<x ; old > new
+try( 8192, 0, 6870); # old=0 , new=<x ; old < new
+try( 8478, 6259, 7906); # old=x , new=x> ; old < new
+try( 9965, 6419, 6419); # old=x> , new=x> ; old = new
+try(16059, 6102, 325); # old=x><x , new=x> ; old > new
+try( 9503, 15073, 6881); # old=x><x> , new=x> ; old > new
+try( 9759, 0, 6625); # old=0 , new=x> ; old < new
+try( 8525, 2081, 8534); # old=x , new=x><x ; old < new
+try(15550, 834, 1428); # old=x> , new=x><x ; old < new
+try(14966, 1668, 3479); # old=x><x , new=x><x ; old < new
+try(16316, 1605, 1605); # old=x><x , new=x><x ; old = new
+try(16093, 4074, 993); # old=x><x , new=x><x ; old > new
+try(14739, 9837, 9837); # old=x><x> , new=x><x ; old = new
+try(14071, 10505, 7344); # old=x><x> , new=x><x ; old > new
+try(12602, 0, 8354); # old=0 , new=x><x ; old < new
+try( 8192, 2767, 8192); # old=<x , new=<x> ; old < new
+try( 8192, 8192, 8192); # old=<x> , new=<x> ; old = new
+try( 8192, 14817, 8192); # old=<x><x , new=<x> ; old > new
+try( 8192, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try( 8192, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try( 8192, 0, 8192); # old=0 , new=<x> ; old < new
+try( 8192, 6532, 10882); # old=<x , new=<x><x ; old < new
+try( 8192, 8192, 16044); # old=<x> , new=<x><x ; old < new
+try( 8192, 9555, 11020); # old=<x><x , new=<x><x ; old < new
+try( 8192, 9001, 9001); # old=<x><x , new=<x><x ; old = new
+try( 8192, 11760, 10274); # old=<x><x , new=<x><x ; old > new
+try( 8192, 16384, 10781); # old=<x><x> , new=<x><x ; old > new
+try( 8192, 24576, 9284); # old=<x><x><x>, new=<x><x ; old > new
+try( 8192, 0, 12488); # old=0 , new=<x><x ; old < new
+try( 8222, 6385, 16354); # old=x , new=x><x> ; old < new
+try(13500, 2884, 11076); # old=x> , new=x><x> ; old < new
+try(14069, 4334, 10507); # old=x><x , new=x><x> ; old < new
+try(14761, 9815, 9815); # old=x><x> , new=x><x> ; old = new
+try(10469, 0, 14107); # old=0 , new=x><x> ; old < new
+try( 8192, 4181, 16384); # old=<x , new=<x><x> ; old < new
+try( 8192, 8192, 16384); # old=<x> , new=<x><x> ; old < new
+try( 8192, 12087, 16384); # old=<x><x , new=<x><x> ; old < new
+try( 8192, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try( 8192, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try( 8192, 0, 16384); # old=0 , new=<x><x> ; old < new
+try( 8192, 4968, 24576); # old=<x , new=<x><x><x>; old < new
+try( 8192, 8192, 24576); # old=<x> , new=<x><x><x>; old < new
+try( 8192, 14163, 24576); # old=<x><x , new=<x><x><x>; old < new
+try( 8192, 16384, 24576); # old=<x><x> , new=<x><x><x>; old < new
+try( 8192, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try( 8192, 0, 24576); # old=0 , new=<x><x><x>; old < new
+try( 8771, 776, 0); # old=x , new=0 ; old > new
+try( 8192, 2813, 0); # old=<x , new=0 ; old > new
+try(13945, 2439, 0); # old=x> , new=0 ; old > new
+try(14493, 6090, 0); # old=x><x , new=0 ; old > new
+try( 8192, 8192, 0); # old=<x> , new=0 ; old > new
+try( 8192, 10030, 0); # old=<x><x , new=0 ; old > new
+try(14983, 9593, 0); # old=x><x> , new=0 ; old > new
+try( 8192, 16384, 0); # old=<x><x> , new=0 ; old > new
+try( 8192, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try(10489, 0, 0); # old=0 , new=0 ; old = new
+
+# (142-223)
+# These tests all take place at the start of the file
+try( 0, 771, 1593); # old=<x , new=<x ; old < new
+try( 0, 4868, 4868); # old=<x , new=<x ; old = new
+try( 0, 147, 118); # old=<x , new=<x ; old > new
+try( 0, 8192, 8192); # old=<x> , new=<x ; old = new
+try( 0, 8192, 4574); # old=<x> , new=<x ; old > new
+try( 0, 11891, 1917); # old=<x><x , new=<x ; old > new
+try( 0, 16384, 5155); # old=<x><x> , new=<x ; old > new
+try( 0, 24576, 2953); # old=<x><x><x>, new=<x ; old > new
+try( 0, 0, 1317); # old=0 , new=<x ; old < new
+try( 0, 5609, 8192); # old=<x , new=<x> ; old < new
+try( 0, 8192, 8192); # old=<x> , new=<x> ; old = new
+try( 0, 11083, 8192); # old=<x><x , new=<x> ; old > new
+try( 0, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try( 0, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try( 0, 0, 8192); # old=0 , new=<x> ; old < new
+try( 0, 6265, 9991); # old=<x , new=<x><x ; old < new
+try( 0, 8192, 16119); # old=<x> , new=<x><x ; old < new
+try( 0, 10218, 11888); # old=<x><x , new=<x><x ; old < new
+try( 0, 14126, 14126); # old=<x><x , new=<x><x ; old = new
+try( 0, 12002, 9034); # old=<x><x , new=<x><x ; old > new
+try( 0, 16384, 13258); # old=<x><x> , new=<x><x ; old > new
+try( 0, 24576, 14367); # old=<x><x><x>, new=<x><x ; old > new
+try( 0, 0, 10881); # old=0 , new=<x><x ; old < new
+try( 0, 6448, 16384); # old=<x , new=<x><x> ; old < new
+try( 0, 8192, 16384); # old=<x> , new=<x><x> ; old < new
+try( 0, 15082, 16384); # old=<x><x , new=<x><x> ; old < new
+try( 0, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try( 0, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try( 0, 0, 16384); # old=0 , new=<x><x> ; old < new
+try( 0, 2421, 24576); # old=<x , new=<x><x><x>; old < new
+try( 0, 8192, 24576); # old=<x> , new=<x><x><x>; old < new
+try( 0, 11655, 24576); # old=<x><x , new=<x><x><x>; old < new
+try( 0, 16384, 24576); # old=<x><x> , new=<x><x><x>; old < new
+try( 0, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try( 0, 0, 24576); # old=0 , new=<x><x><x>; old < new
+try( 0, 6530, 0); # old=<x , new=0 ; old > new
+try( 0, 8192, 0); # old=<x> , new=0 ; old > new
+try( 0, 14707, 0); # old=<x><x , new=0 ; old > new
+try( 0, 16384, 0); # old=<x><x> , new=0 ; old > new
+try( 0, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try( 0, 0, 0); # old=0 , new=0 ; old = new
+
+# (224-277)
+# These tests all take place at the end of the file
+$FLEN = 40960; # Force the file to be exactly 40960 bytes long
+try(32768, 8192, 8192); # old=<x> , new=<x ; old = new
+try(32768, 8192, 4026); # old=<x> , new=<x ; old > new
+try(24576, 16384, 1917); # old=<x><x> , new=<x ; old > new
+try(16384, 24576, 3818); # old=<x><x><x>, new=<x ; old > new
+try(40960, 0, 2779); # old=0 , new=<x ; old < new
+try(32768, 8192, 8192); # old=<x> , new=<x> ; old = new
+try(24576, 16384, 8192); # old=<x><x> , new=<x> ; old > new
+try(16384, 24576, 8192); # old=<x><x><x>, new=<x> ; old > new
+try(40960, 0, 8192); # old=0 , new=<x> ; old < new
+try(32768, 8192, 10724); # old=<x> , new=<x><x ; old < new
+try(24576, 16384, 12221); # old=<x><x> , new=<x><x ; old > new
+try(16384, 24576, 15030); # old=<x><x><x>, new=<x><x ; old > new
+try(40960, 0, 11752); # old=0 , new=<x><x ; old < new
+try(32768, 8192, 16384); # old=<x> , new=<x><x> ; old < new
+try(24576, 16384, 16384); # old=<x><x> , new=<x><x> ; old = new
+try(16384, 24576, 16384); # old=<x><x><x>, new=<x><x> ; old > new
+try(40960, 0, 16384); # old=0 , new=<x><x> ; old < new
+try(32768, 8192, 24576); # old=<x> , new=<x><x><x>; old < new
+try(24576, 16384, 24576); # old=<x><x> , new=<x><x><x>; old < new
+try(16384, 24576, 24576); # old=<x><x><x>, new=<x><x><x>; old = new
+try(40960, 0, 24576); # old=0 , new=<x><x><x>; old < new
+try(35973, 4987, 0); # old=x> , new=0 ; old > new
+try(32768, 8192, 0); # old=<x> , new=0 ; old > new
+try(29932, 11028, 0); # old=x><x> , new=0 ; old > new
+try(24576, 16384, 0); # old=<x><x> , new=0 ; old > new
+try(16384, 24576, 0); # old=<x><x><x>, new=0 ; old > new
+try(40960, 0, 0); # old=0 , new=0 ; old = new
+
+# (278-357)
+# These tests all take place at the end of the file
+$FLEN = 42000; # Force the file to be exactly 42000 bytes long
+try(41275, 725, 4059); # old=x , new=x ; old < new
+try(41683, 317, 317); # old=x , new=x ; old = new
+try(41225, 775, 405); # old=x , new=x ; old > new
+try(35709, 6291, 284); # old=x><x , new=x ; old > new
+try(42000, 0, 2434); # old=0 , new=x ; old < new
+try(40960, 1040, 1608); # old=<x , new=<x ; old < new
+try(40960, 1040, 1040); # old=<x , new=<x ; old = new
+try(40960, 1040, 378); # old=<x , new=<x ; old > new
+try(32768, 9232, 5604); # old=<x><x , new=<x ; old > new
+try(42000, 0, 6637); # old=0 , new=<x ; old < new
+try(41022, 978, 8130); # old=x , new=x> ; old < new
+try(39994, 2006, 966); # old=x><x , new=x> ; old > new
+try(42000, 0, 7152); # old=0 , new=x> ; old < new
+try(41613, 387, 10601); # old=x , new=x><x ; old < new
+try(38460, 3540, 3938); # old=x><x , new=x><x ; old < new
+try(36725, 5275, 5275); # old=x><x , new=x><x ; old = new
+try(37990, 4010, 3199); # old=x><x , new=x><x ; old > new
+try(42000, 0, 9189); # old=0 , new=x><x ; old < new
+try(40960, 1040, 8192); # old=<x , new=<x> ; old < new
+try(32768, 9232, 8192); # old=<x><x , new=<x> ; old > new
+try(42000, 0, 8192); # old=0 , new=<x> ; old < new
+try(40960, 1040, 11778); # old=<x , new=<x><x ; old < new
+try(32768, 9232, 13792); # old=<x><x , new=<x><x ; old < new
+try(32768, 9232, 9232); # old=<x><x , new=<x><x ; old = new
+try(32768, 9232, 8795); # old=<x><x , new=<x><x ; old > new
+try(42000, 0, 8578); # old=0 , new=<x><x ; old < new
+try(41531, 469, 15813); # old=x , new=x><x> ; old < new
+try(39618, 2382, 9534); # old=x><x , new=x><x> ; old < new
+try(42000, 0, 15344); # old=0 , new=x><x> ; old < new
+try(40960, 1040, 16384); # old=<x , new=<x><x> ; old < new
+try(32768, 9232, 16384); # old=<x><x , new=<x><x> ; old < new
+try(42000, 0, 16384); # old=0 , new=<x><x> ; old < new
+try(40960, 1040, 24576); # old=<x , new=<x><x><x>; old < new
+try(32768, 9232, 24576); # old=<x><x , new=<x><x><x>; old < new
+try(42000, 0, 24576); # old=0 , new=<x><x><x>; old < new
+try(41500, 500, 0); # old=x , new=0 ; old > new
+try(40960, 1040, 0); # old=<x , new=0 ; old > new
+try(35272, 6728, 0); # old=x><x , new=0 ; old > new
+try(32768, 9232, 0); # old=<x><x , new=0 ; old > new
+try(42000, 0, 0); # old=0 , new=0 ; old = new
+
+
+
+sub try {
+ my ($pos, $len, $newlen) = @_;
+ open F, "> $file" or die "Couldn't open file $file: $!";
+ binmode F;
+
+ # The record has exactly 17 characters. This will help ensure that
+ # even if _downcoopy screws up, the data doesn't coincidentally
+ # look good because the remainder accidentally lines up.
+ my $d = substr("0123456789abcdef$:", -17);
+ my $recs = defined($FLEN) ?
+ int($FLEN/length($d))+1 : # enough to make up at least $FLEN
+ int(8192*5/length($d))+1; # at least 5 blocks' worth
+ my $oldfile = $d x $recs;
+ my $flen = defined($FLEN) ? $FLEN : $recs * 17;
+ substr($oldfile, $FLEN) = "" if defined $FLEN; # truncate
+ print F $oldfile;
+ close F;
+
+ die "wrong length!" unless -s $file == $flen;
+
+ my $newdata = "-" x $newlen;
+ my $expected = $oldfile;
+ my $old = defined $len ? substr($expected, $pos, $len)
+ : substr($expected, $pos);
+ $old = "$newdata$old";
+ my $x_retval;
+ if (defined $len) {
+ substr($expected, $pos, $len, substr($old, 0, $len, ""));
+ $x_retval = $old;
+ } else {
+ substr($expected, $pos) = $old;
+ $x_retval = "";
+ }
+
+ my $o = tie my @lines, 'Tie::File', $file or die $!;
+ local $SIG{ALRM} = sub { die "Alarm clock" };
+ my $a_retval = eval { alarm(5) unless $^P; $o->_downcopy($newdata, $pos, $len) };
+ my $err = $@;
+ undef $o; untie @lines;
+ if ($err) {
+ if ($err =~ /^Alarm clock/) {
+ print "# Timeout\n";
+ print "not ok $N\n"; $N++;
+ print "not ok $N\n"; $N++;
+ return;
+ } else {
+ $@ = $err;
+ die;
+ }
+ }
+
+ open F, "< $file" or die "Couldn't open file $file: $!";
+ binmode F;
+ my $actual;
+ { local $/;
+ $actual = <F>;
+ }
+ close F;
+
+ my ($alen, $xlen) = (length $actual, length $expected);
+ unless ($alen == $xlen) {
+ my @ARGS = @_;
+ for (@ARGS) { $_ = "UNDEF" unless defined }
+ print "# try(@ARGS) expected file length $xlen, actual $alen!\n";
+ }
+ print $actual eq $expected ? "ok $N\n" : "not ok $N\n";
+ $N++;
+ print $a_retval eq $x_retval ? "ok $N\n" : "not ok $N\n";
+ $N++;
+
+ if (defined $len) {
+ try($pos, undef, $newlen);
+ }
+}
+
+
+
+use POSIX 'SEEK_SET';
+sub check_contents {
+ my @c = @_;
+ my $x = join $:, @c, '';
+ local *FH = $o->{fh};
+ seek FH, 0, SEEK_SET;
+# my $open = open FH, "< $file";
+ my $a;
+ { local $/; $a = <FH> }
+ $a = "" unless defined $a;
+ if ($a eq $x) {
+ print "ok $N\n";
+ } else {
+ ctrlfix($a, $x);
+ print "not ok $N\n# expected <$x>, got <$a>\n";
+ }
+ $N++;
+
+ # now check FETCH:
+ my $good = 1;
+ my $msg;
+ for (0.. $#c) {
+ my $aa = $a[$_];
+ unless ($aa eq "$c[$_]$:") {
+ $msg = "expected <$c[$_]$:>, got <$aa>";
+ ctrlfix($msg);
+ $good = 0;
+ }
+ }
+ print $good ? "ok $N\n" : "not ok $N # $msg\n";
+ $N++;
+
+ print $o->_check_integrity($file, $ENV{INTEGRITY})
+ ? "ok $N\n" : "not ok $N\n";
+ $N++;
+}
+
+sub ctrlfix {
+ for (@_) {
+ s/\n/\\n/g;
+ s/\r/\\r/g;
+ }
+}
+
+END {
+ undef $o;
+ untie @a;
+ 1 while unlink $file;
+}
+
--- /dev/null
+#!/usr/bin/perl
+#
+# Unit tests of _upcopy function
+#
+# _upcopy($self, $source, $dest, $len)
+#
+# Take a block of data of leength $len at $source and copy it
+# to $dest, which must be <= $source but which need not be <= $source - $len
+# (That is, this will only copy a block to a position earlier in the file,
+# but the source and destination regions may overlap.)
+
+
+my $file = "tf$$.txt";
+
+print "1..55\n";
+
+my $N = 1;
+use Tie::File;
+print "ok $N\n"; $N++;
+
+$: = Tie::File::_default_recsep();
+
+my @subtests = qw(x <x x> x><x <x> <x><x x><x> <x><x> <x><x><x> 0);
+
+$FLEN = 40970; # 2410 records of 17 chars each
+
+# (2-7) Trivial non-moves at start of file
+try(0, 0, 0);
+try(0, 0, 10);
+try(0, 0, 100);
+try(0, 0, 1000);
+try(0, 0, 10000);
+try(0, 0, 20000);
+
+# (8-13) Trivial non-moves in middle of file
+try(100, 100, 0);
+try(100, 100, 10);
+try(100, 100, 100);
+try(100, 100, 1000);
+try(100, 100, 10000);
+try(100, 100, 20000);
+
+# (14) Trivial non-move at end of file
+try($FLEN, $FLEN, 0);
+
+# (15-17) Trivial non-move of tail of file
+try(0, 0, undef);
+try(100, 100, undef);
+try($FLEN, $FLEN, undef);
+
+# (18-24) Moves to start of file
+try(100, 0, 0);
+try(100, 0, 10);
+try(100, 0, 100);
+try(100, 0, 1000);
+try(100, 0, 10000);
+try(100, 0, 20000);
+try(100, 0, undef);
+
+# (25-31) Moves in middle of file
+try(200, 100, 0);
+try(200, 100, 10);
+try(200, 100, 100);
+try(200, 100, 1000);
+try(200, 100, 10000);
+try(200, 100, 20000);
+try(200, 100, undef);
+
+# (32-43) Moves from end of file
+try($FLEN, 10000, 0);
+try($FLEN-10, 10000, 10);
+try($FLEN-100, 10000, 100);
+try($FLEN-1000, 200, 1000);
+try($FLEN-10000, 200, 10000);
+try($FLEN-20000, 200, 20000);
+try($FLEN, 10000, undef);
+try($FLEN-10, 10000, undef);
+try($FLEN-100, 10000, undef);
+try($FLEN-1000, 200, undef);
+try($FLEN-10000, 200, undef);
+try($FLEN-20000, 200, undef);
+
+$FLEN = 40960;
+
+# (44-55) Moves from end of file when file ends on a block boundary
+try($FLEN, 10000, 0);
+try($FLEN-10, 10000, 10);
+try($FLEN-100, 10000, 100);
+try($FLEN-1000, 200, 1000);
+try($FLEN-10000, 200, 10000);
+try($FLEN-20000, 200, 20000);
+try($FLEN, 10000, undef);
+try($FLEN-10, 10000, undef);
+try($FLEN-100, 10000, undef);
+try($FLEN-1000, 200, undef);
+try($FLEN-10000, 200, undef);
+try($FLEN-20000, 200, undef);
+
+sub try {
+ my ($src, $dst, $len) = @_;
+ open F, "> $file" or die "Couldn't open file $file: $!";
+ binmode F;
+
+ # The record has exactly 17 characters. This will help ensure that
+ # even if _upcopy screws up, the data doesn't coincidentally
+ # look good because the remainder accidentally lines up.
+ my $d = substr("0123456789abcdef$:", -17);
+ my $recs = defined($FLEN) ?
+ int($FLEN/length($d))+1 : # enough to make up at least $FLEN
+ int(8192*5/length($d))+1; # at least 5 blocks' worth
+ my $oldfile = $d x $recs;
+ my $flen = defined($FLEN) ? $FLEN : $recs * 17;
+ substr($oldfile, $FLEN) = "" if defined $FLEN; # truncate
+ print F $oldfile;
+ close F;
+
+ die "wrong length!" unless -s $file == $flen;
+
+ # If len is specified, use that. If it's undef,
+ # then behave *as if* we had specified the whole rest of the file
+ my $expected = $oldfile;
+ if (defined $len) {
+ substr($expected, $dst, $len) = substr($expected, $src, $len);
+ } else {
+ substr($expected, $dst) = substr($expected, $src);
+ }
+
+ my $o = tie my @lines, 'Tie::File', $file or die $!;
+ local $SIG{ALRM} = sub { die "Alarm clock" };
+ my $a_retval = eval { alarm(5) unless $^P; $o->_upcopy($src, $dst, $len) };
+ my $err = $@;
+ undef $o; untie @lines;
+ if ($err) {
+ if ($err =~ /^Alarm clock/) {
+ print "# Timeout\n";
+ print "not ok $N\n"; $N++;
+ return;
+ } else {
+ $@ = $err;
+ die;
+ }
+ }
+
+ open F, "< $file" or die "Couldn't open file $file: $!";
+ binmode F;
+ my $actual;
+ { local $/;
+ $actual = <F>;
+ }
+ close F;
+
+ my ($alen, $xlen) = (length $actual, length $expected);
+ unless ($alen == $xlen) {
+ print "# try(@_) expected file length $xlen, actual $alen!\n";
+ }
+ print $actual eq $expected ? "ok $N\n" : "not ok $N\n";
+ $N++;
+}
+
+
+
+use POSIX 'SEEK_SET';
+sub check_contents {
+ my @c = @_;
+ my $x = join $:, @c, '';
+ local *FH = $o->{fh};
+ seek FH, 0, SEEK_SET;
+# my $open = open FH, "< $file";
+ my $a;
+ { local $/; $a = <FH> }
+ $a = "" unless defined $a;
+ if ($a eq $x) {
+ print "ok $N\n";
+ } else {
+ ctrlfix($a, $x);
+ print "not ok $N\n# expected <$x>, got <$a>\n";
+ }
+ $N++;
+
+ # now check FETCH:
+ my $good = 1;
+ my $msg;
+ for (0.. $#c) {
+ my $aa = $a[$_];
+ unless ($aa eq "$c[$_]$:") {
+ $msg = "expected <$c[$_]$:>, got <$aa>";
+ ctrlfix($msg);
+ $good = 0;
+ }
+ }
+ print $good ? "ok $N\n" : "not ok $N # $msg\n";
+ $N++;
+
+ print $o->_check_integrity($file, $ENV{INTEGRITY})
+ ? "ok $N\n" : "not ok $N\n";
+ $N++;
+}
+
+sub ctrlfix {
+ for (@_) {
+ s/\n/\\n/g;
+ s/\r/\\r/g;
+ }
+}
+
+END {
+ undef $o;
+ untie @a;
+ 1 while unlink $file;
+}
+
check_contents($data);
$a[2] = "recordC"; # That should flush the whole darn defer
-# Flushing the defer requires looking up the true lengths of records
-# 0..2, which flushes out the read cache, leaving only 1..2 there.
-# Then the splicer updates the cached versions of 1..2 to contain the
-# new data
-check_caches({1 => "recordB$:", 2 => "recordC$:"},
+# This shouldn't change the cache contents
+check_caches({map(($_ => "record$_$:"), 5..7)},
{}); # URRRP
check_contents(join("$:", qw(recordA recordB recordC
record3 record4 record5 record6 record7)) . "$:");
$a[3] = "recordD"; # even though we flushed, deferring is STILL ENABLED
-check_caches({1 => "recordB$:", 2 => "recordC$:"},
+check_caches({map(($_ => "record$_$:"), 5..7)},
{3 => "recordD$:"});
check_contents(join("$:", qw(recordA recordB recordC
record3 record4 record5 record6 record7)) . "$:");
# Check readcache-deferbuffer interactions
# (45-47) This should remove outdated data from the read cache
-$a[2] = "recordE";
-check_caches({1 => "recordB$:", },
- {3 => "recordD$:", 2 => "recordE$:"});
+$a[5] = "recordE";
+check_caches({6 => "record6$:", 7 => "record7$:"},
+ {3 => "recordD$:", 5 => "recordE$:"});
check_contents(join("$:", qw(recordA recordB recordC
record3 record4 record5 record6 record7)) . "$:");
# (48-51) This should read back out of the defer buffer
# without adding anything to the read cache
my $z;
-$z = $a[2];
+$z = $a[5];
print $z eq "recordE" ? "ok $N\n" : "not ok $N\n"; $N++;
-check_caches({1 => "recordB$:", },
- {3 => "recordD$:", 2 => "recordE$:"});
+check_caches({6 => "record6$:", 7 => "record7$:"},
+ {3 => "recordD$:", 5 => "recordE$:"});
check_contents(join("$:", qw(recordA recordB recordC
record3 record4 record5 record6 record7)) . "$:");
# (52-55) This should repopulate the read cache with a new record
$z = $a[0];
print $z eq "recordA" ? "ok $N\n" : "not ok $N\n"; $N++;
-check_caches({1 => "recordB$:", 0 => "recordA$:"},
- {3 => "recordD$:", 2 => "recordE$:"});
+check_caches({0 => "recordA$:", 6 => "record6$:", 7 => "record7$:"},
+ {3 => "recordD$:", 5 => "recordE$:"});
check_contents(join("$:", qw(recordA recordB recordC
record3 record4 record5 record6 record7)) . "$:");
# (56-59) This should flush the LRU record from the read cache
-$z = $a[4]; $z = $a[5];
-print $z eq "record5" ? "ok $N\n" : "not ok $N\n"; $N++;
-check_caches({5 => "record5$:", 0 => "recordA$:", 4 => "record4$:"},
- {3 => "recordD$:", 2 => "recordE$:"});
+$z = $a[4];
+print $z eq "record4" ? "ok $N\n" : "not ok $N\n"; $N++;
+check_caches({7 => "record7$:", 0 => "recordA$:", 4 => "record4$:"},
+ {3 => "recordD$:", 5 => "recordE$:"});
check_contents(join("$:", qw(recordA recordB recordC
record3 record4 record5 record6 record7)) . "$:");
# (60-63) This should FLUSH the deferred buffer
-# In doing so, it will read in records 2 and 3, flushing 0 and 4
-# from the read cache, leaving 2, 3, and 5.
$z = splice @a, 3, 1, "recordZ";
print $z eq "recordD" ? "ok $N\n" : "not ok $N\n"; $N++;
-check_caches({5 => "record5$:", 3 => "recordZ$:", 2 => "recordE$:"},
+check_caches({7 => "record7$:", 0 => "recordA$:", 4 => "record4$:", 3 => "recordZ$:"},
{});
-check_contents(join("$:", qw(recordA recordB recordE
- recordZ record4 record5 record6 record7)) . "$:");
+check_contents(join("$:", qw(recordA recordB recordC
+ recordZ record4 recordE record6 record7)) . "$:");
# (64-66) We should STILL be in deferred writing mode
$a[5] = "recordX";
-check_caches({3 => "recordZ$:", 2 => "recordE$:"},
+check_caches({7 => "record7$:", 0 => "recordA$:", 4 => "record4$:", 3 => "recordZ$:"},
{5 => "recordX$:"});
-check_contents(join("$:", qw(recordA recordB recordE
- recordZ record4 record5 record6 record7)) . "$:");
+check_contents(join("$:", qw(recordA recordB recordC
+ recordZ record4 recordE record6 record7)) . "$:");
# Fill up the defer buffer again
$a[4] = "recordP";
# (67-69) This should OVERWRITE the existing deferred record
# and NOT flush the buffer
$a[5] = "recordQ";
-check_caches({3 => "recordZ$:", 2 => "recordE$:"},
+check_caches({7 => "record7$:", 0 => "recordA$:", 3 => "recordZ$:"},
{5 => "recordQ$:", 4 => "recordP$:"});
-check_contents(join("$:", qw(recordA recordB recordE
- recordZ record4 record5 record6 record7)) . "$:");
-
+check_contents(join("$:", qw(recordA recordB recordC
+ recordZ record4 recordE record6 record7)) . "$:");
# (70-72) Discard should just dump the whole deferbuffer
$o->discard;
-check_caches({3 => "recordZ$:", 2 => "recordE$:"},
+check_caches({7 => "record7$:", 0 => "recordA$:", 3 => "recordZ$:"},
{});
-check_contents(join("$:", qw(recordA recordB recordE
- recordZ record4 record5 record6 record7)) . "$:");
+check_contents(join("$:", qw(recordA recordB recordC
+ recordZ record4 recordE record6 record7)) . "$:");
+
# (73-75) NOW we are out of deferred writing mode
$a[0] = "recordF";
-check_caches({3 => "recordZ$:", 2 => "recordE$:", 0 => "recordF$:"},
+check_caches({7 => "record7$:", 0 => "recordF$:", 3 => "recordZ$:"},
{});
-check_contents(join("$:", qw(recordF recordB recordE
- recordZ record4 record5 record6 record7)) . "$:");
+check_contents(join("$:", qw(recordF recordB recordC
+ recordZ record4 recordE record6 record7)) . "$:");
# (76-79) Last call--untying the array should flush the deferbuffer
$o->defer;
$a[0] = "flushed";
-check_caches({3 => "recordZ$:", 2 => "recordE$:"},
+check_caches({7 => "record7$:", 3 => "recordZ$:"},
{0 => "flushed$:" });
-check_contents(join("$:", qw(recordF recordB recordE
- recordZ record4 record5 record6 record7)) . "$:");
+check_contents(join("$:", qw(recordF recordB recordC
+ recordZ record4 recordE record6 record7)) . "$:");
undef $o;
untie @a;
# (79) We can't use check_contents any more, because the object is dead
binmode F;
{ local $/ ; $z = <F> }
close F;
-my $x = join("$:", qw(flushed recordB recordE
- recordZ record4 record5 record6 record7)) . "$:";
+my $x = join("$:", qw(flushed recordB recordC
+ recordZ record4 recordE record6 record7)) . "$:";
if ($z eq $x) {
print "ok $N\n";
} else {
}
END {
+ undef $o;
+ untie @a if tied @a;
1 while unlink $file;
}
--- /dev/null
+#!/usr/bin/perl
+
+# 2003-04-09 Tels: test the offset method from 0.94
+
+use Test::More;
+use strict;
+use File::Spec;
+
+use POSIX 'SEEK_SET';
+my $file = "tf$$.txt";
+
+BEGIN
+ {
+ $| = 1;
+ if ($ENV{PERL_CORE})
+ {
+ # testing with the core distribution
+ @INC = ( File::Spec->catdir(File::Spec->updir, 't', 'lib') );
+ }
+ unshift @INC, File::Spec->catdir(File::Spec->updir, 'lib');
+ chdir 't' if -d 't';
+ print "# INC = @INC\n";
+
+ plan tests => 24;
+
+ use_ok ('Tie::File');
+ }
+
+$/ = "#"; # avoid problems with \n\r vs. \n
+
+my @a;
+my $o = tie @a, 'Tie::File', $file, autodefer => 0;
+
+is (ref($o), 'Tie::File');
+
+is ($o->offset(0), 0, 'first one always there');
+is ($o->offset(1), undef, 'no offsets yet');
+
+$a[0] = 'Bourbon';
+is ($o->offset(0), 0, 'first is ok');
+is ($o->offset(1), 8, 'and second ok');
+is ($o->offset(2), undef, 'third undef');
+
+$a[1] = 'makes';
+is ($o->offset(0), 0, 'first is ok');
+is ($o->offset(1), 8, 'and second ok');
+is ($o->offset(2), 14, 'and third ok');
+is ($o->offset(3), undef, 'fourth undef');
+
+$a[2] = 'the baby';
+is ($o->offset(0), 0, 'first is ok');
+is ($o->offset(1), 8, 'and second ok');
+is ($o->offset(2), 14, 'and third ok');
+is ($o->offset(3), 23, 'and fourth ok');
+is ($o->offset(4), undef, 'fourth undef');
+
+$a[3] = 'grin';
+is ($o->offset(0), 0, 'first is ok');
+is ($o->offset(1), 8, 'and second ok');
+is ($o->offset(2), 14, 'and third ok');
+is ($o->offset(3), 23, 'and fourth ok');
+is ($o->offset(4), 28, 'and fifth ok');
+
+$a[4] = '!';
+is ($o->offset(5), 30, 'and fifth ok');
+$a[3] = 'water';
+is ($o->offset(4), 29, 'and fourth changed ok');
+is ($o->offset(5), 31, 'and fifth ok');
+
+END {
+ undef $o;
+ untie @a;
+ 1 while unlink $file;
+}
projects / platform / upstream / perl.git / commitdiff