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BEGIN { |
BEGIN { |
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use Exporter (); |
use Exporter (); |
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use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
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$VERSION = 0.08; |
$VERSION = 0.09; |
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@ISA = qw (Exporter); |
@ISA = qw (Exporter); |
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#Give a hoot don't pollute, do not export more than needed by default |
#Give a hoot don't pollute, do not export more than needed by default |
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@EXPORT = qw (); |
@EXPORT = qw (); |
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isisdb => './cds/cds', |
isisdb => './cds/cds', |
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); |
); |
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for(my $mfn = 1; $mfn <= $isis->{'maxmfn'}; $mfn++) { |
for(my $mfn = 1; $mfn <= $isis->count; $mfn++) { |
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print $isis->to_ascii($mfn),"\n"; |
print $isis->to_ascii($mfn),"\n"; |
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} |
} |
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=back |
=back |
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It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database. |
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=cut |
=cut |
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sub new { |
sub new { |
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# read the $db.FDT file for tags |
# read the $db.FDT file for tags |
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my $fieldzone=0; |
my $fieldzone=0; |
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open(fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!"; |
open(my $fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!"; |
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binmode($fileFDT); |
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while (<fileFDT>) { |
while (<$fileFDT>) { |
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chomp; |
chomp; |
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if ($fieldzone) { |
if ($fieldzone) { |
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my $name=substr($_,0,30); |
my $name=substr($_,0,30); |
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} |
} |
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} |
} |
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close(fileFDT); |
close($fileFDT); |
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} |
} |
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# Get the Maximum MFN from $db.MST |
# Get the Maximum MFN from $db.MST |
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open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!"; |
open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!"; |
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binmode($self->{'fileMST'}); |
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# MST format: (* = 32 bit signed) |
# MST format: (* = 32 bit signed) |
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# CTLMFN* always 0 |
# CTLMFN* always 0 |
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# NXTMFB* last block allocated to master file |
# NXTMFB* last block allocated to master file |
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# NXTMFP offset to next available position in last block |
# NXTMFP offset to next available position in last block |
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# MFTYPE always 0 for user db file (1 for system) |
# MFTYPE always 0 for user db file (1 for system) |
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seek($self->{'fileMST'},4,0); |
seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!"; |
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my $buff; |
my $buff; |
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read($self->{'fileMST'}, $buff, 4); |
read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!"; |
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$self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero"; |
$self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero"; |
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# save maximum MFN |
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$self->{'maxmfn'} = $self->{'NXTMFN'} - 1; |
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print STDERR Dumper($self),"\n" if ($self->{debug}); |
print STDERR Dumper($self),"\n" if ($self->{debug}); |
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# open files for later |
# open files for later |
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open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!"; |
open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!"; |
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binmode($self->{'fileXRF'}); |
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$self ? return $self : return undef; |
$self ? return $self : return undef; |
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} |
} |
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=head2 read_cnt |
=head2 count |
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Read content of C<.CNT> file and return hash containing it. |
Return number of records in database |
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print Dumper($isis->read_cnt); |
print $isis->count; |
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This function is not used by module (C<.CNT> files are not required for this |
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module to work), but it can be useful to examine your index (while debugging |
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for example). |
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=cut |
=cut |
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sub read_cnt { |
sub count { |
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my $self = shift; |
my $self = shift; |
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return $self->{'NXTMFN'} - 1; |
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croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file}); |
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# Get the index information from $db.CNT |
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open(fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!"; |
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# There is two 26 Bytes fixed lenght records |
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# 0: IDTYPE BTree type 16 |
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# 2: ORDN Nodes Order 16 |
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# 4: ORDF Leafs Order 16 |
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# 6: N Number of Memory buffers for nodes 16 |
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# 8: K Number of buffers for first level index 16 |
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# 10: LIV Current number of Index Levels 16 |
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# 12: POSRX* Pointer to Root Record in N0x 32 |
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# 16: NMAXPOS* Next Available position in N0x 32 |
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# 20: FMAXPOS* Next available position in L0x 32 |
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# 24: ABNORMAL Formal BTree normality indicator 16 |
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# length: 26 bytes |
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sub unpack_cnt { |
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my $self = shift; |
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my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL); |
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my $buff = shift || return; |
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my @arr = unpack("ssssssllls", $buff); |
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print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'}); |
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my $IDTYPE = shift @arr; |
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foreach (@flds) { |
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$self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr); |
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} |
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} |
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my $buff; |
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read(fileCNT, $buff, 26); |
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$self->unpack_cnt($buff); |
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read(fileCNT, $buff, 26); |
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$self->unpack_cnt($buff); |
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close(fileCNT); |
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return $self->{cnt}; |
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} |
} |
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=head2 fetch |
=head2 fetch |
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# read XRFMFB abd XRFMFP |
# read XRFMFB abd XRFMFP |
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read($self->{'fileXRF'}, $buff, 4); |
read($self->{'fileXRF'}, $buff, 4); |
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my $pointer=unpack("l",$buff) || carp "pointer is null"; |
my $pointer=unpack("V",$buff) || croak "pointer is null"; |
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# check for logically deleted record |
# check for logically deleted record |
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if ($pointer < 0) { |
if ($pointer & 0x80000000) { |
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print STDERR "## record $mfn is logically deleted\n" if ($self->{debug}); |
print STDERR "## record $mfn is logically deleted\n" if ($self->{debug}); |
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$self->{deleted} = $mfn; |
$self->{deleted} = $mfn; |
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return unless $self->{include_deleted}; |
return unless $self->{include_deleted}; |
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$pointer = abs($pointer); |
# abs |
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$pointer = ($pointer ^ 0xffffffff) + 1; |
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} |
} |
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my $XRFMFB = int($pointer/2048); |
my $XRFMFB = int($pointer/2048); |
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# Get Record Information |
# Get Record Information |
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seek($self->{'fileMST'},$blk_off,0); |
seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!"; |
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read($self->{'fileMST'}, $buff, 4); |
read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!"; |
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my $value=unpack("l",$buff); |
my $value=unpack("V",$buff); |
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print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug}); |
print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug}); |
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read($self->{'fileMST'}, $buff, 14); |
read($self->{'fileMST'}, $buff, 14); |
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my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff); |
my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff); |
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print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug}); |
print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug}); |
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for (my $i = 0 ; $i < $NVF ; $i++) { |
for (my $i = 0 ; $i < $NVF ; $i++) { |
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my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6)); |
my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6)); |
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print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug}); |
print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug}); |
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return $self->{'TagName'}->{$tag} || $tag; |
return $self->{'TagName'}->{$tag} || $tag; |
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} |
} |
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=head2 read_cnt |
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Read content of C<.CNT> file and return hash containing it. |
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print Dumper($isis->read_cnt); |
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This function is not used by module (C<.CNT> files are not required for this |
513 |
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module to work), but it can be useful to examine your index (while debugging |
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for example). |
515 |
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=cut |
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sub read_cnt { |
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my $self = shift; |
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croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file}); |
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# Get the index information from $db.CNT |
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open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!"; |
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binmode($fileCNT); |
527 |
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my $buff; |
529 |
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read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!"; |
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$self->unpack_cnt($buff); |
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read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!"; |
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$self->unpack_cnt($buff); |
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536 |
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close($fileCNT); |
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return $self->{cnt}; |
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} |
540 |
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=head2 unpack_cnt |
542 |
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Unpack one of two 26 bytes fixed length record in C<.CNT> file. |
544 |
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Here is definition of record: |
546 |
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off key description size |
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0: IDTYPE BTree type s |
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2: ORDN Nodes Order s |
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4: ORDF Leafs Order s |
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6: N Number of Memory buffers for nodes s |
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8: K Number of buffers for first level index s |
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10: LIV Current number of Index Levels s |
554 |
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12: POSRX Pointer to Root Record in N0x l |
555 |
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16: NMAXPOS Next Available position in N0x l |
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20: FMAXPOS Next available position in L0x l |
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24: ABNORMAL Formal BTree normality indicator s |
558 |
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length: 26 bytes |
559 |
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560 |
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This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>. |
561 |
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562 |
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=cut |
563 |
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564 |
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sub unpack_cnt { |
565 |
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my $self = shift; |
566 |
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567 |
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my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL); |
568 |
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my $buff = shift || return; |
570 |
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my @arr = unpack("vvvvvvVVVv", $buff); |
571 |
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572 |
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print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'}); |
573 |
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574 |
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my $IDTYPE = shift @arr; |
575 |
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foreach (@flds) { |
576 |
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$self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr); |
577 |
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} |
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} |
579 |
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580 |
1; |
1; |
581 |
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582 |
=head1 BUGS |
=head1 BUGS |