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dpavlin |
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package IsisDB; |
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use strict; |
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use Carp; |
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use Data::Dumper; |
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BEGIN { |
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use Exporter (); |
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use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
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$VERSION = 0.01; |
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@ISA = qw (Exporter); |
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#Give a hoot don't pollute, do not export more than needed by default |
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@EXPORT = qw (); |
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@EXPORT_OK = qw (); |
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%EXPORT_TAGS = (); |
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} |
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=head1 NAME |
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IsisDB - Read CDS/ISIS database |
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=head1 SYNOPSIS |
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use IsisDB |
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my $isis = new IsisDB( |
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isisdb => './cds/cds', |
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); |
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=head1 DESCRIPTION |
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This module will read CDS/ISIS databases and create hash values out of it. |
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It can be used as perl-only alternative to OpenIsis module. |
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=head1 METHODS |
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=cut |
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# my $ORDN; # Nodes Order |
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# my $ORDF; # Leafs Order |
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# my $N; # Number of Memory buffers for nodes |
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# my $K; # Number of buffers for first level index |
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# my $LIV; # Current number of Index Levels |
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# my $POSRX; # Pointer to Root Record in N0x |
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# my $NMAXPOS; # Next Available position in N0x |
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# my $FMAXPOS; # Next available position in L0x |
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# my $ABNORMAL; # Formal BTree normality indicator |
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# |
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# some binary reads |
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# |
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sub Read32 { |
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my $self = shift; |
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my $f = shift || die "Read32 needs file handle"; |
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read($$f,$b,4) || die "can't read 4 bytes from $$f from position ".tell($f); |
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return unpack("l",$b); |
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} |
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=head2 new |
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Open CDS/ISIS database |
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my $isis = new IsisDB( |
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isisdb => './cds/cds', |
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read_fdt => 1, |
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debug => 1, |
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); |
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dpavlin |
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Options are described below: |
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=over 5 |
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dpavlin |
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=item isisdb |
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Prefix path to CDS/ISIS. It should contain full or relative path to database |
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and common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files. |
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=item read_fdt |
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Boolean flag to specify if field definition table should be read. It's off |
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by default. |
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=item debug |
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Dump a C<lot> of debugging output. |
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dpavlin |
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=back |
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It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database. |
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dpavlin |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {}; |
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bless($self, $class); |
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$self->{isisdb} = {@_}->{isisdb} || croak "new needs database name as argument!"; |
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dpavlin |
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$self->{debug} = {@_}->{debug}; |
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dpavlin |
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# if you want to read .FDT file use read_fdt argument when creating class! |
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if ({@_}->{read_fdt} && -e $self->{isisdb}.".FDT") { |
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# read the $db.FDT file for tags |
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my $fieldzone=0; |
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open(fileFDT, $self->{isisdb}.".FDT") || croak "can't read '$self->{isisdb}.FDT': $!"; |
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while (<fileFDT>) { |
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chomp; |
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if ($fieldzone) { |
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my $name=substr($_,0,30); |
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my $tag=substr($_,50,3); |
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$name =~ s/\s+$//; |
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$tag =~ s/\s+$//; |
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$self->{'TagName'}->{$tag}=$name; |
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} |
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if (/^\*\*\*/) { |
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$fieldzone=1; |
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} |
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} |
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close(fileFDT); |
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} |
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# Get the Maximum MFN from $db.MST |
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open(fileMST,$self->{isisdb}.".MST") || croak "can't read '$self->{isisdb}.MST': $!"; |
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# MST format: (* = 32 bit signed) |
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# CTLMFN* always 0 |
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# NXTMFN* MFN to be assigned to the next record created |
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# NXTMFB* last block allocated to master file |
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# NXTMFP offset to next available position in last block |
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# MFTYPE always 0 for user db file (1 for system) |
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seek(fileMST,4,0); |
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$self->{'NXTMFN'}=$self->Read32(\*fileMST) || carp "NXTNFN is zero"; |
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dpavlin |
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# save maximum MFN |
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$self->{'maxmfn'} = $self->{'NXTMFN'} - 1; |
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dpavlin |
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close(fileMST); |
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# Get the index information from $db.CNT |
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open(fileCNT, $self->{isisdb}.".CNT") || croak "can't read '$self->{isisdb}.CNT': $!"; |
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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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my $IDTYPE = shift @arr; |
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foreach (@flds) { |
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$self->{$IDTYPE}->{$_} = 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($buff); |
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close(fileCNT); |
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print Dumper($self) if ($self->{debug}); |
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$self ? return $self : return undef; |
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} |
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dpavlin |
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=head2 GetMFN |
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dpavlin |
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dpavlin |
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Read record with selected MFN |
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dpavlin |
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dpavlin |
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my $rec = $isis->GetMFN(55); |
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Returns hash with keys which are field names and values are unpacked values |
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for that field. |
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=cut |
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dpavlin |
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sub GetMFN { |
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my $self = shift; |
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my $mfn = shift || croak "GetMFN needs MFN as argument!"; |
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print "GetMFN: $mfn\n" if ($self->{debug}); |
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open(fileXRF, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!"; |
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# XXX check this? |
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my $mfnpos=($mfn+int(($mfn-1)/127))*4; |
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print "seeking to $mfnpos in file '$self->{isisdb}.XRF'\n" if ($self->{debug}); |
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seek(fileXRF,$mfnpos,0); |
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# read XRFMFB abd XRFMFP |
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my $pointer=$self->Read32(\*fileXRF); |
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my $XRFMFB = int($pointer/2048); |
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my $XRFMFP = $pointer - ($XRFMFB*2048); |
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print "XRFMFB: $XRFMFB XRFMFP: $XRFMFP\n" if ($self->{debug}); |
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# XXX fix this to be more readable!! |
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# e.g. (XRFMFB - 1) * 512 + XRFMFP |
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my $offset = $pointer; |
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my $offset2=int($offset/2048)-1; |
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my $offset22=int($offset/4096); |
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my $offset3=$offset-($offset22*4096); |
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if ($offset3>512) { |
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$offset3=$offset3-2048; |
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} |
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my $offset4=($offset2*512)+$offset3; |
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print "$offset - $offset2 - $offset3 - $offset4\n" if ($self->{debug}); |
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close(fileXRF); |
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# Get Record Information |
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open(fileMST, $self->{isisdb}.".MST") || croak "can't open '$self->{isisdb}.MST': $!"; |
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seek(fileMST,$offset4,0); |
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my $value=$self->Read32(\*fileMST); |
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if ($value!=$mfn) { |
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print ("Error: The MFN:".$mfn." is not found in MST(".$value.")"); |
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return -1; # XXX deleted record? |
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} |
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# $MFRL=$self->Read16($fileMST); |
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# $MFBWB=$self->Read32($fileMST); |
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# $MFBWP=$self->Read16($fileMST); |
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# $BASE=$self->Read16($fileMST); |
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# $NVF=$self->Read16($fileMST); |
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# $STATUS=$self->Read16($fileMST); |
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my $buff; |
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read(fileMST, $buff, 14); |
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my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff); |
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print "MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug}); |
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# Get Directory Format |
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my @FieldPOS; |
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my @FieldLEN; |
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my @FieldTAG; |
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for (my $i = 0 ; $i < $NVF ; $i++) { |
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# $TAG=$self->Read16($fileMST); |
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# $POS=$self->Read16($fileMST); |
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# $LEN=$self->Read16($fileMST); |
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read(fileMST, $buff, 6); |
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my ($TAG,$POS,$LEN) = unpack("sss", $buff); |
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print "TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug}); |
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# The TAG does not exists in .FDT so we set it to 0. |
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# |
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# XXX This is removed from perl version; .FDT file is updated manually, so |
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# you will often have fields in .MST file which aren't in .FDT. On the other |
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# hand, IsisMarc doesn't use .FDT files at all! |
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#if (! $self->{TagName}->{$TAG}) { |
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# $TAG=0; |
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#} |
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push @FieldTAG,$TAG; |
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push @FieldPOS,$POS; |
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push @FieldLEN,$LEN; |
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} |
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# Get Variable Fields |
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dpavlin |
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delete $self->{record}; |
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dpavlin |
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for (my $i = 0 ; $i < $NVF ; $i++) { |
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my $rec; |
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read(fileMST,$rec,$FieldLEN[$i]); |
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dpavlin |
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push @{$self->{record}->{$FieldTAG[$i]}}, $rec; |
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dpavlin |
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} |
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close(fileMST); |
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# The record is marked for deletion |
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if ($STATUS==1) { |
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return -1; |
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} |
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print Dumper($self) if ($self->{debug}); |
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dpavlin |
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return $self->{'record'}; |
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dpavlin |
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} |
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dpavlin |
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=head2 to_ascii |
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Dump ascii output of selected MFN |
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print $isis->to_ascii(55); |
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=cut |
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sub to_ascii { |
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my $self = shift; |
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my $mfn = shift || croak "need MFN"; |
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my $rec = $self->GetMFN($mfn); |
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print STDERR Dumper($rec); |
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my $out = "0\t$mfn"; |
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foreach my $f (sort keys %{$rec}) { |
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$out .= "\n$f\t".join("\n$f\t",@{$self->{record}->{$f}}); |
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} |
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$out .= "\n"; |
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return $out; |
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} |
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################# old cruft which is not ported from php to perl |
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dpavlin |
1 |
=begin php |
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# Load the dictionary from the $db.L0x files. |
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# Not usefull Yet |
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sub LoadDictionary() |
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{ |
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$fileL01=fopen($self->{isisdb}.".L01","r"); |
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rewind($fileL01); |
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do |
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{ |
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$POS=$self->Read32($fileL01); |
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$OCK=$self->Read16($fileL01); |
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$IT=$self->Read16($fileL01); |
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$PS=$self->Read32($fileL01); |
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print "<br>PS:".$PS." ".$self->{ORDF}->{1}." "; |
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for ($i=0;$i<$OCK;$i++) |
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{ |
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$KEY=fread($fileL01,10); |
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print $KEY." ### "; |
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$INFO1=$self->Read32($fileL01); |
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$INFO2=$self->Read32($fileL01); |
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#L01Key->{$key}=array($INFO1,$INFO2); |
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} |
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rewind($fileL01); |
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$offset=($PS-1)*(12+$self->{ORDF}->{1}*18*2); |
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fseek($fileL01,$offset); |
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} While (!feof($fileL01)); |
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fclose($fileL01); |
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} |
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# self function search through the tree and returns an array of pointers to IFP |
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# The function must be recursive |
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|
|
sub SearchTree($search,$fileNB,$PUNT) |
400 |
|
|
{ |
401 |
|
|
$offset=(($PUNT-1)*(8+2*$self->{ORDN}->{1}*14)); |
402 |
|
|
|
403 |
|
|
rewind($fileNB1); |
404 |
|
|
|
405 |
|
|
fseek($fileNB,$offset); |
406 |
|
|
|
407 |
|
|
$POS=$self->Read32($fileNB); |
408 |
|
|
$OCK=$self->Read16($fileNB); |
409 |
|
|
$IT=$self->Read16($fileNB); |
410 |
|
|
|
411 |
|
|
#print "<br>".$POS." - ".$OCK." - ".$IT; |
412 |
|
|
|
413 |
|
|
$OLDPUNT=$POS; |
414 |
|
|
$j=0; |
415 |
|
|
for ($i=0;$i<$OCK;$i++) |
416 |
|
|
{ |
417 |
|
|
$KEY=fread($fileNB,10); |
418 |
|
|
|
419 |
|
|
$PUNT=$self->Read32($fileNB); |
420 |
|
|
|
421 |
|
|
#print " ## ".chop($KEY)."(".$PUNT."-".$OLDPUNT.") ## "; |
422 |
|
|
|
423 |
|
|
If (strcmp($search,chop($KEY))<0) |
424 |
|
|
{ |
425 |
|
|
break; |
426 |
|
|
} |
427 |
|
|
$OLDPUNT=$PUNT; |
428 |
|
|
} |
429 |
|
|
#print $OLDPUNT; |
430 |
|
|
Return $OLDPUNT; |
431 |
|
|
} |
432 |
|
|
|
433 |
|
|
# Search ISIS for record containing search |
434 |
|
|
# Return a sorted array of MFN |
435 |
|
|
|
436 |
|
|
sub Search($search) |
437 |
|
|
{ |
438 |
|
|
|
439 |
|
|
$search=strtoupper($search); |
440 |
|
|
#print "Searching....".$search." - ".$self->{POSRX}->{1}."<br>"; |
441 |
|
|
# first search .x01 |
442 |
|
|
|
443 |
|
|
|
444 |
|
|
# Search in .N01 |
445 |
|
|
|
446 |
|
|
|
447 |
|
|
$fileN01=fopen($self->{isisdb}.".N01","r"); |
448 |
|
|
$offset=(($self->{POSRX}->{1}-1)*(8+2*$self->{ORDN}->{1}*14)); |
449 |
|
|
|
450 |
|
|
do |
451 |
|
|
{ |
452 |
|
|
rewind($fileN01); |
453 |
|
|
|
454 |
|
|
fseek($fileN01,$offset); |
455 |
|
|
|
456 |
|
|
$POS=$self->Read32($fileN01); |
457 |
|
|
$OCK=$self->Read16($fileN01); |
458 |
|
|
$IT=$self->Read16($fileN01); |
459 |
|
|
|
460 |
|
|
#print "<br>".$POS." - ".$OCK." - ".$IT; |
461 |
|
|
|
462 |
|
|
$OLDPUNT=$POS; |
463 |
|
|
for ($i=0;$i<$OCK;$i++) |
464 |
|
|
{ |
465 |
|
|
$KEY=fread($fileN01,10); |
466 |
|
|
|
467 |
|
|
$PUNT=$self->Read32($fileN01); |
468 |
|
|
|
469 |
|
|
#print " ## ".chop($KEY)."(".$PUNT."-".$OLDPUNT.") ## "; |
470 |
|
|
|
471 |
|
|
If (strcmp($search,chop($KEY))<0) |
472 |
|
|
{ |
473 |
|
|
break; |
474 |
|
|
} |
475 |
|
|
$OLDPUNT=$PUNT; |
476 |
|
|
} |
477 |
|
|
$offset=(($OLDPUNT-1)*(8+2*$self->{ORDN}->{1}*14)); |
478 |
|
|
} while ($OLDPUNT>0); |
479 |
|
|
#print $OLDPUNT; |
480 |
|
|
|
481 |
|
|
|
482 |
|
|
fclose($fileN01); |
483 |
|
|
|
484 |
|
|
# Now look for records in .L01 file |
485 |
|
|
$fileL01=fopen($self->{isisdb}.".L01","r"); |
486 |
|
|
rewind($fileL01); |
487 |
|
|
|
488 |
|
|
$offset=(-$OLDPUNT-1)*(12+$self->{ORDF}->{1}*18*2); |
489 |
|
|
fseek($fileL01,$offset); |
490 |
|
|
|
491 |
|
|
$POS=$self->Read32($fileL01); |
492 |
|
|
$OCK=$self->Read16($fileL01); |
493 |
|
|
$IT=$self->Read16($fileL01); |
494 |
|
|
$PS=$self->Read32($fileL01); |
495 |
|
|
#print "<br>POS:".$POS." ".$self->{ORDF}->{1}." "; |
496 |
|
|
for ($i=0;$i<$OCK;$i++) |
497 |
|
|
{ |
498 |
|
|
$KEY=fread($fileL01,10); |
499 |
|
|
|
500 |
|
|
#print $KEY." ### "; |
501 |
|
|
|
502 |
|
|
$INFO1=$self->Read32($fileL01); |
503 |
|
|
$INFO2=$self->Read32($fileL01); |
504 |
|
|
|
505 |
|
|
If (strcmp($search,chop($KEY))==0) |
506 |
|
|
{ |
507 |
|
|
break; |
508 |
|
|
} |
509 |
|
|
} |
510 |
|
|
|
511 |
|
|
fclose($fileL01); |
512 |
|
|
|
513 |
|
|
#print $INFO1."--".$INFO2; |
514 |
|
|
|
515 |
|
|
# Now look in .IFP for the MFN |
516 |
|
|
$fileIFP=fopen($self->{isisdb}.".IFP","r"); |
517 |
|
|
rewind($fileIFP); |
518 |
|
|
$offset=($INFO1-1)*512+($INFO2*4); |
519 |
|
|
fseek($fileIFP,$offset); |
520 |
|
|
|
521 |
|
|
$IFPBLK=$self->Read32($fileIFP); |
522 |
|
|
|
523 |
|
|
$IFPNXTB=$self->Read32($fileIFP); |
524 |
|
|
$IFPNXTP=$self->Read32($fileIFP); |
525 |
|
|
$IFPTOTP=$self->Read32($fileIFP); |
526 |
|
|
$IFPSEGP=$self->Read32($fileIFP); |
527 |
|
|
$IFPSEGC=$self->Read32($fileIFP); |
528 |
|
|
|
529 |
|
|
|
530 |
|
|
#print "<br>IFP:".$IFPBLK." # ".$IFPNXTB." - ".$IFPNXTP." - ".$IFPTOTP." - ".$IFPSEGP." - ".$IFPSEGC; |
531 |
|
|
|
532 |
|
|
rewind($fileIFP); |
533 |
|
|
$offset=($INFO1-1)*512+24+($INFO2*4); |
534 |
|
|
fseek($fileIFP,$offset); |
535 |
|
|
|
536 |
|
|
$j=24+($INFO2*4); |
537 |
|
|
$k=0; |
538 |
|
|
$l=1; |
539 |
|
|
$OLDPMFN=""; |
540 |
|
|
for ($i=0;$i<$IFPSEGP;$i++) |
541 |
|
|
{ |
542 |
|
|
$B1=$self->Read8($fileIFP); |
543 |
|
|
$B2=$self->Read8($fileIFP); |
544 |
|
|
$B3=$self->Read8($fileIFP); |
545 |
|
|
$B4=$self->Read8($fileIFP); |
546 |
|
|
$B5=$self->Read8($fileIFP); |
547 |
|
|
$B6=$self->Read8($fileIFP); |
548 |
|
|
$B7=$self->Read8($fileIFP); |
549 |
|
|
$B8=$self->Read8($fileIFP); |
550 |
|
|
|
551 |
|
|
$PMFN=$B1*65536+$B2*256+$B3; |
552 |
|
|
$PTAG=$B4*256+$B5; |
553 |
|
|
$POCC=$B6; |
554 |
|
|
$PCNT=$B7*256+$B8; |
555 |
|
|
|
556 |
|
|
if ($OLDPMFN!=$PMFN) |
557 |
|
|
{ |
558 |
|
|
if ($PMFN!=0) |
559 |
|
|
{ |
560 |
|
|
$self->{MFNArray}->{$l}=$PMFN; |
561 |
|
|
$OLDPMFN=$PMFN; |
562 |
|
|
$l+=1; |
563 |
|
|
} |
564 |
|
|
} |
565 |
|
|
|
566 |
|
|
$j=$j+8; |
567 |
|
|
#print "<br>".$PMFN."-".$PTAG." - ".$POCC." - ".$PCNT; |
568 |
|
|
#print "@@".$j."@@@@"; |
569 |
|
|
if ($j>=504) |
570 |
|
|
{ |
571 |
|
|
if ($IFPNXTB==0 && $IFPNXTP==0) |
572 |
|
|
{ |
573 |
|
|
$k=$k+1; |
574 |
|
|
rewind($fileIFP); |
575 |
|
|
$offset=($INFO1-1+$k)*512; |
576 |
|
|
fseek($fileIFP,$offset); |
577 |
|
|
$B=$self->Read32($fileIFP); |
578 |
|
|
#print "<br>-".$B."-<br>"; |
579 |
|
|
$j=0; |
580 |
|
|
} else |
581 |
|
|
{ |
582 |
|
|
rewind($fileIFP); |
583 |
|
|
$offset=($IFPNXTB-1)*512; |
584 |
|
|
fseek($fileIFP,$offset); |
585 |
|
|
|
586 |
|
|
$OLDIFPNXTB=$IFPNXTB; |
587 |
|
|
$OLDIFPNXTP=$IFPNXTP; |
588 |
|
|
|
589 |
|
|
$IFPBLK=$self->Read32($fileIFP); |
590 |
|
|
|
591 |
|
|
$IFPNXTB=$self->Read32($fileIFP); |
592 |
|
|
$IFPNXTP=$self->Read32($fileIFP); |
593 |
|
|
$IFPTOTP=$self->Read32($fileIFP); |
594 |
|
|
$IFPSEGP=$self->Read32($fileIFP); |
595 |
|
|
$IFPSEGC=$self->Read32($fileIFP); |
596 |
|
|
|
597 |
|
|
rewind($fileIFP); |
598 |
|
|
$offset=($OLDIFPNXTB-1)*512+24+($OLDIFPNXTP*4); |
599 |
|
|
fseek($fileIFP,$offset); |
600 |
|
|
|
601 |
|
|
$j=24+($OLDIFPNXTP*4); |
602 |
|
|
$k=0; |
603 |
|
|
$j=0; |
604 |
|
|
} |
605 |
|
|
} |
606 |
|
|
|
607 |
|
|
} |
608 |
|
|
fclose($fileIFP); |
609 |
|
|
return $l-1; |
610 |
|
|
} |
611 |
|
|
|
612 |
|
|
=cut |
613 |
|
|
|
614 |
|
|
# |
615 |
|
|
# XXX porting from php left-over: |
616 |
|
|
# |
617 |
|
|
# do I *REALLY* need those methods, or should I use |
618 |
|
|
# $self->{something} directly? |
619 |
|
|
# |
620 |
|
|
# Probably direct usage is better! |
621 |
|
|
# |
622 |
|
|
|
623 |
|
|
sub GetFieldName { |
624 |
|
|
my $self = shift; |
625 |
|
|
return $self->{FieldName}; |
626 |
|
|
} |
627 |
|
|
|
628 |
|
|
sub GetTagName { |
629 |
|
|
my $self = shift; |
630 |
|
|
return $self->{TagName}; |
631 |
|
|
} |
632 |
|
|
|
633 |
|
|
sub GetFieldTag { |
634 |
|
|
my $self = shift; |
635 |
|
|
return $self->{FieldTAG}; |
636 |
|
|
} |
637 |
|
|
|
638 |
|
|
sub GetNextMFN { |
639 |
|
|
my $self = shift; |
640 |
|
|
return $self->{NXTMFN}; |
641 |
|
|
} |
642 |
|
|
|
643 |
|
|
sub GetMFNArray { |
644 |
|
|
my $self = shift; |
645 |
|
|
return $self->{MFNArray}; |
646 |
|
|
} |
647 |
|
|
=begin php |
648 |
|
|
|
649 |
|
|
sub Read32($fileNB) |
650 |
|
|
{ |
651 |
|
|
$B1=ord(fread($fileNB,1)); |
652 |
|
|
$B2=ord(fread($fileNB,1)); |
653 |
|
|
$B3=ord(fread($fileNB,1)); |
654 |
|
|
$B4=ord(fread($fileNB,1)); |
655 |
|
|
|
656 |
|
|
if ($B4<=128) |
657 |
|
|
{ |
658 |
|
|
$value=$B1+$B2*256+$B3*65536+$B4*16777216; |
659 |
|
|
} else |
660 |
|
|
{ |
661 |
|
|
$value=$self->Not8($B1)+$self->Not8($B2)*256+$self->Not8($B3)*65536+$self->Not8($B4)*16777216; |
662 |
|
|
$value=-($value+1); |
663 |
|
|
} |
664 |
|
|
# print "(".$B1.",".$B2.",".$B3.",".$B4.":".$value.")"; |
665 |
|
|
|
666 |
|
|
return $value; |
667 |
|
|
} |
668 |
|
|
|
669 |
|
|
sub Read24($fileNB) |
670 |
|
|
{ |
671 |
|
|
$B1=ord(fread($fileNB,1)); |
672 |
|
|
$B2=ord(fread($fileNB,1)); |
673 |
|
|
$B3=ord(fread($fileNB,1)); |
674 |
|
|
|
675 |
|
|
$value=$B1+$B2*256+$B3*65536; |
676 |
|
|
|
677 |
|
|
# print "(".$B1.",".$B2.",".$B3.":".$value.")"; |
678 |
|
|
|
679 |
|
|
return $value; |
680 |
|
|
} |
681 |
|
|
|
682 |
|
|
sub Read16($fileNB) |
683 |
|
|
{ |
684 |
|
|
$B1=ord(fread($fileNB,1)); |
685 |
|
|
$B2=ord(fread($fileNB,1)); |
686 |
|
|
|
687 |
|
|
$value=$B1+$B2*256; |
688 |
|
|
# print "(".$B1.",".$B2.":".$value.")"; |
689 |
|
|
|
690 |
|
|
return $value; |
691 |
|
|
} |
692 |
|
|
|
693 |
|
|
sub Read8($fileNB) |
694 |
|
|
{ |
695 |
|
|
$B1=ord(fread($fileNB,1)); |
696 |
|
|
|
697 |
|
|
$value=$B1; |
698 |
|
|
# print "(".$value.")"; |
699 |
|
|
|
700 |
|
|
return $value; |
701 |
|
|
} |
702 |
|
|
|
703 |
|
|
sub Not8($value) |
704 |
|
|
{ |
705 |
|
|
$value=decbin($value); |
706 |
|
|
if (strlen($value)<8) |
707 |
|
|
{ |
708 |
|
|
$buffer=""; |
709 |
|
|
for($i=0;$i<(8-strlen($value));$i++) |
710 |
|
|
{ |
711 |
|
|
$buffer.="0"; |
712 |
|
|
} |
713 |
|
|
$value=$buffer.$value; |
714 |
|
|
} |
715 |
|
|
$value=ereg_replace("0","3",$value); |
716 |
|
|
$value=ereg_replace("1","0",$value); |
717 |
|
|
$value=ereg_replace("3","1",$value); |
718 |
|
|
$value=bindec($value); |
719 |
|
|
return $value; |
720 |
|
|
} |
721 |
|
|
} |
722 |
|
|
|
723 |
|
|
=cut |
724 |
|
|
|
725 |
|
|
1; |
726 |
|
|
__END__ |
727 |
|
|
|
728 |
|
|
=head1 BUGS |
729 |
|
|
|
730 |
|
|
This module has been very lightly tested. Use with caution and report bugs. |
731 |
|
|
|
732 |
|
|
=head1 AUTHOR |
733 |
|
|
|
734 |
|
|
Dobrica Pavlinusic |
735 |
|
|
CPAN ID: DPAVLIN |
736 |
|
|
dpavlin@rot13.org |
737 |
|
|
http://www.rot13.org/~dpavlin/ |
738 |
|
|
|
739 |
|
|
This module is based heavily on code from LIBISIS.PHP - Library to read ISIS files V0.1.1 |
740 |
|
|
written in php and (c) 2000 Franck Martin - <franck@sopac.org> released under LGPL. |
741 |
|
|
|
742 |
|
|
=head1 COPYRIGHT |
743 |
|
|
|
744 |
|
|
This program is free software; you can redistribute |
745 |
|
|
it and/or modify it under the same terms as Perl itself. |
746 |
|
|
|
747 |
|
|
The full text of the license can be found in the |
748 |
|
|
LICENSE file included with this module. |
749 |
|
|
|
750 |
|
|
|
751 |
|
|
=head1 SEE ALSO |
752 |
|
|
|
753 |
|
|
L<http://www.openisis.org|OpenIsis>, perl(1). |
754 |
|
|
|