1 |
package IsisDB; |
2 |
use strict; |
3 |
|
4 |
use Carp; |
5 |
use Data::Dumper; |
6 |
|
7 |
BEGIN { |
8 |
use Exporter (); |
9 |
use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
10 |
$VERSION = 0.01; |
11 |
@ISA = qw (Exporter); |
12 |
#Give a hoot don't pollute, do not export more than needed by default |
13 |
@EXPORT = qw (); |
14 |
@EXPORT_OK = qw (); |
15 |
%EXPORT_TAGS = (); |
16 |
|
17 |
} |
18 |
|
19 |
=head1 NAME |
20 |
|
21 |
IsisDB - Read CDS/ISIS database |
22 |
|
23 |
=head1 SYNOPSIS |
24 |
|
25 |
use IsisDB |
26 |
my $isis = new IsisDB( |
27 |
isisdb => './cds/cds', |
28 |
); |
29 |
|
30 |
=head1 DESCRIPTION |
31 |
|
32 |
This module will read CDS/ISIS databases and create hash values out of it. |
33 |
It can be used as perl-only alternative to OpenIsis module. |
34 |
|
35 |
=head1 METHODS |
36 |
|
37 |
=cut |
38 |
|
39 |
# my $ORDN; # Nodes Order |
40 |
# my $ORDF; # Leafs Order |
41 |
# my $N; # Number of Memory buffers for nodes |
42 |
# my $K; # Number of buffers for first level index |
43 |
# my $LIV; # Current number of Index Levels |
44 |
# my $POSRX; # Pointer to Root Record in N0x |
45 |
# my $NMAXPOS; # Next Available position in N0x |
46 |
# my $FMAXPOS; # Next available position in L0x |
47 |
# my $ABNORMAL; # Formal BTree normality indicator |
48 |
|
49 |
# |
50 |
# some binary reads |
51 |
# |
52 |
|
53 |
sub Read32 { |
54 |
my $self = shift; |
55 |
|
56 |
my $f = shift || die "Read32 needs file handle"; |
57 |
read($$f,$b,4) || die "can't read 4 bytes from $$f from position ".tell($f); |
58 |
return unpack("l",$b); |
59 |
} |
60 |
|
61 |
=head2 new |
62 |
|
63 |
Open CDS/ISIS database |
64 |
|
65 |
my $isis = new IsisDB( |
66 |
isisdb => './cds/cds', |
67 |
read_fdt => 1, |
68 |
debug => 1, |
69 |
); |
70 |
|
71 |
Options are described below: |
72 |
|
73 |
=over 5 |
74 |
|
75 |
=item isisdb |
76 |
|
77 |
Prefix path to CDS/ISIS. It should contain full or relative path to database |
78 |
and common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files. |
79 |
|
80 |
=item read_fdt |
81 |
|
82 |
Boolean flag to specify if field definition table should be read. It's off |
83 |
by default. |
84 |
|
85 |
=item debug |
86 |
|
87 |
Dump a C<lot> of debugging output. |
88 |
|
89 |
=back |
90 |
|
91 |
It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database. |
92 |
|
93 |
=cut |
94 |
|
95 |
sub new { |
96 |
my $class = shift; |
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my $self = {}; |
98 |
bless($self, $class); |
99 |
|
100 |
$self->{isisdb} = {@_}->{isisdb} || croak "new needs database name as argument!"; |
101 |
|
102 |
$self->{debug} = {@_}->{debug}; |
103 |
|
104 |
# if you want to read .FDT file use read_fdt argument when creating class! |
105 |
if ({@_}->{read_fdt} && -e $self->{isisdb}.".FDT") { |
106 |
|
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# read the $db.FDT file for tags |
108 |
my $fieldzone=0; |
109 |
|
110 |
open(fileFDT, $self->{isisdb}.".FDT") || croak "can't read '$self->{isisdb}.FDT': $!"; |
111 |
|
112 |
while (<fileFDT>) { |
113 |
chomp; |
114 |
if ($fieldzone) { |
115 |
my $name=substr($_,0,30); |
116 |
my $tag=substr($_,50,3); |
117 |
|
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$name =~ s/\s+$//; |
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$tag =~ s/\s+$//; |
120 |
|
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$self->{'TagName'}->{$tag}=$name; |
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} |
123 |
|
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if (/^\*\*\*/) { |
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$fieldzone=1; |
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} |
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} |
128 |
|
129 |
close(fileFDT); |
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} |
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|
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# Get the Maximum MFN from $db.MST |
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|
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open(fileMST,$self->{isisdb}.".MST") || croak "can't read '$self->{isisdb}.MST': $!"; |
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|
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# MST format: (* = 32 bit signed) |
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# CTLMFN* always 0 |
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# NXTMFN* MFN to be assigned to the next record created |
139 |
# NXTMFB* last block allocated to master file |
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# NXTMFP offset to next available position in last block |
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# MFTYPE always 0 for user db file (1 for system) |
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seek(fileMST,4,0); |
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$self->{'NXTMFN'}=$self->Read32(\*fileMST) || carp "NXTNFN is zero"; |
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|
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# save maximum MFN |
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$self->{'maxmfn'} = $self->{'NXTMFN'} - 1; |
147 |
|
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close(fileMST); |
149 |
|
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# Get the index information from $db.CNT |
151 |
|
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open(fileCNT, $self->{isisdb}.".CNT") || croak "can't read '$self->{isisdb}.CNT': $!"; |
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|
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# There is two 26 Bytes fixed lenght records |
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|
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# 0: IDTYPE BTree type 16 |
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# 2: ORDN Nodes Order 16 |
158 |
# 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 |
164 |
# 20: FMAXPOS* Next available position in L0x 32 |
165 |
# 24: ABNORMAL Formal BTree normality indicator 16 |
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# length: 26 bytes |
167 |
|
168 |
sub unpack_cnt { |
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my $self = shift; |
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|
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my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL); |
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|
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my $buff = shift || return; |
174 |
my @arr = unpack("ssssssllls", $buff); |
175 |
|
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my $IDTYPE = shift @arr; |
177 |
foreach (@flds) { |
178 |
$self->{$IDTYPE}->{$_} = abs(shift @arr); |
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} |
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} |
181 |
|
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my $buff; |
183 |
read(fileCNT, $buff, 26); |
184 |
$self->unpack_cnt($buff); |
185 |
|
186 |
read(fileCNT, $buff, 26); |
187 |
$self->unpack_cnt($buff); |
188 |
|
189 |
|
190 |
close(fileCNT); |
191 |
|
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print Dumper($self) if ($self->{debug}); |
193 |
|
194 |
$self ? return $self : return undef; |
195 |
} |
196 |
|
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=head2 GetMFN |
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|
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Read record with selected MFN |
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|
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my $rec = $isis->GetMFN(55); |
202 |
|
203 |
Returns hash with keys which are field names and values are unpacked values |
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for that field. |
205 |
|
206 |
=cut |
207 |
|
208 |
sub GetMFN { |
209 |
my $self = shift; |
210 |
|
211 |
my $mfn = shift || croak "GetMFN needs MFN as argument!"; |
212 |
|
213 |
print "GetMFN: $mfn\n" if ($self->{debug}); |
214 |
|
215 |
open(fileXRF, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!"; |
216 |
|
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# XXX check this? |
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my $mfnpos=($mfn+int(($mfn-1)/127))*4; |
219 |
|
220 |
print "seeking to $mfnpos in file '$self->{isisdb}.XRF'\n" if ($self->{debug}); |
221 |
seek(fileXRF,$mfnpos,0); |
222 |
|
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# read XRFMFB abd XRFMFP |
224 |
my $pointer=$self->Read32(\*fileXRF); |
225 |
|
226 |
my $XRFMFB = int($pointer/2048); |
227 |
my $XRFMFP = $pointer - ($XRFMFB*2048); |
228 |
|
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print "XRFMFB: $XRFMFB XRFMFP: $XRFMFP\n" if ($self->{debug}); |
230 |
|
231 |
# XXX fix this to be more readable!! |
232 |
# e.g. (XRFMFB - 1) * 512 + XRFMFP |
233 |
|
234 |
my $offset = $pointer; |
235 |
my $offset2=int($offset/2048)-1; |
236 |
my $offset22=int($offset/4096); |
237 |
my $offset3=$offset-($offset22*4096); |
238 |
if ($offset3>512) { |
239 |
$offset3=$offset3-2048; |
240 |
} |
241 |
my $offset4=($offset2*512)+$offset3; |
242 |
|
243 |
print "$offset - $offset2 - $offset3 - $offset4\n" if ($self->{debug}); |
244 |
|
245 |
close(fileXRF); |
246 |
|
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# Get Record Information |
248 |
|
249 |
open(fileMST, $self->{isisdb}.".MST") || croak "can't open '$self->{isisdb}.MST': $!"; |
250 |
|
251 |
seek(fileMST,$offset4,0); |
252 |
|
253 |
my $value=$self->Read32(\*fileMST); |
254 |
|
255 |
if ($value!=$mfn) { |
256 |
print ("Error: The MFN:".$mfn." is not found in MST(".$value.")"); |
257 |
return -1; # XXX deleted record? |
258 |
} |
259 |
|
260 |
# $MFRL=$self->Read16($fileMST); |
261 |
# $MFBWB=$self->Read32($fileMST); |
262 |
# $MFBWP=$self->Read16($fileMST); |
263 |
# $BASE=$self->Read16($fileMST); |
264 |
# $NVF=$self->Read16($fileMST); |
265 |
# $STATUS=$self->Read16($fileMST); |
266 |
|
267 |
my $buff; |
268 |
read(fileMST, $buff, 14); |
269 |
|
270 |
my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff); |
271 |
|
272 |
print "MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug}); |
273 |
|
274 |
# Get Directory Format |
275 |
|
276 |
my @FieldPOS; |
277 |
my @FieldLEN; |
278 |
my @FieldTAG; |
279 |
|
280 |
for (my $i = 0 ; $i < $NVF ; $i++) { |
281 |
|
282 |
# $TAG=$self->Read16($fileMST); |
283 |
# $POS=$self->Read16($fileMST); |
284 |
# $LEN=$self->Read16($fileMST); |
285 |
|
286 |
read(fileMST, $buff, 6); |
287 |
my ($TAG,$POS,$LEN) = unpack("sss", $buff); |
288 |
|
289 |
print "TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug}); |
290 |
|
291 |
# The TAG does not exists in .FDT so we set it to 0. |
292 |
# |
293 |
# XXX This is removed from perl version; .FDT file is updated manually, so |
294 |
# you will often have fields in .MST file which aren't in .FDT. On the other |
295 |
# hand, IsisMarc doesn't use .FDT files at all! |
296 |
|
297 |
#if (! $self->{TagName}->{$TAG}) { |
298 |
# $TAG=0; |
299 |
#} |
300 |
|
301 |
push @FieldTAG,$TAG; |
302 |
push @FieldPOS,$POS; |
303 |
push @FieldLEN,$LEN; |
304 |
} |
305 |
|
306 |
# Get Variable Fields |
307 |
|
308 |
delete $self->{record}; |
309 |
|
310 |
for (my $i = 0 ; $i < $NVF ; $i++) { |
311 |
my $rec; |
312 |
read(fileMST,$rec,$FieldLEN[$i]); |
313 |
push @{$self->{record}->{$FieldTAG[$i]}}, $rec; |
314 |
} |
315 |
close(fileMST); |
316 |
|
317 |
# The record is marked for deletion |
318 |
if ($STATUS==1) { |
319 |
return -1; |
320 |
} |
321 |
|
322 |
print Dumper($self) if ($self->{debug}); |
323 |
|
324 |
return $self->{'record'}; |
325 |
} |
326 |
|
327 |
=head2 to_ascii |
328 |
|
329 |
Dump ascii output of selected MFN |
330 |
|
331 |
print $isis->to_ascii(55); |
332 |
|
333 |
=cut |
334 |
|
335 |
sub to_ascii { |
336 |
my $self = shift; |
337 |
|
338 |
my $mfn = shift || croak "need MFN"; |
339 |
|
340 |
my $rec = $self->GetMFN($mfn); |
341 |
|
342 |
my $out = "0\t$mfn"; |
343 |
|
344 |
foreach my $f (sort keys %{$rec}) { |
345 |
$out .= "\n$f\t".join("\n$f\t",@{$self->{record}->{$f}}); |
346 |
} |
347 |
|
348 |
$out .= "\n"; |
349 |
|
350 |
return $out; |
351 |
} |
352 |
|
353 |
################# old cruft which is not ported from php to perl |
354 |
|
355 |
=begin php |
356 |
|
357 |
# Load the dictionary from the $db.L0x files. |
358 |
# Not usefull Yet |
359 |
|
360 |
sub LoadDictionary() |
361 |
{ |
362 |
$fileL01=fopen($self->{isisdb}.".L01","r"); |
363 |
rewind($fileL01); |
364 |
|
365 |
do |
366 |
{ |
367 |
|
368 |
$POS=$self->Read32($fileL01); |
369 |
$OCK=$self->Read16($fileL01); |
370 |
$IT=$self->Read16($fileL01); |
371 |
$PS=$self->Read32($fileL01); |
372 |
print "<br>PS:".$PS." ".$self->{ORDF}->{1}." "; |
373 |
for ($i=0;$i<$OCK;$i++) |
374 |
{ |
375 |
$KEY=fread($fileL01,10); |
376 |
|
377 |
print $KEY." ### "; |
378 |
|
379 |
$INFO1=$self->Read32($fileL01); |
380 |
$INFO2=$self->Read32($fileL01); |
381 |
|
382 |
#L01Key->{$key}=array($INFO1,$INFO2); |
383 |
} |
384 |
|
385 |
rewind($fileL01); |
386 |
$offset=($PS-1)*(12+$self->{ORDF}->{1}*18*2); |
387 |
fseek($fileL01,$offset); |
388 |
|
389 |
} While (!feof($fileL01)); |
390 |
|
391 |
fclose($fileL01); |
392 |
} |
393 |
|
394 |
# self function search through the tree and returns an array of pointers to IFP |
395 |
# The function must be recursive |
396 |
|
397 |
sub SearchTree($search,$fileNB,$PUNT) |
398 |
{ |
399 |
$offset=(($PUNT-1)*(8+2*$self->{ORDN}->{1}*14)); |
400 |
|
401 |
rewind($fileNB1); |
402 |
|
403 |
fseek($fileNB,$offset); |
404 |
|
405 |
$POS=$self->Read32($fileNB); |
406 |
$OCK=$self->Read16($fileNB); |
407 |
$IT=$self->Read16($fileNB); |
408 |
|
409 |
#print "<br>".$POS." - ".$OCK." - ".$IT; |
410 |
|
411 |
$OLDPUNT=$POS; |
412 |
$j=0; |
413 |
for ($i=0;$i<$OCK;$i++) |
414 |
{ |
415 |
$KEY=fread($fileNB,10); |
416 |
|
417 |
$PUNT=$self->Read32($fileNB); |
418 |
|
419 |
#print " ## ".chop($KEY)."(".$PUNT."-".$OLDPUNT.") ## "; |
420 |
|
421 |
If (strcmp($search,chop($KEY))<0) |
422 |
{ |
423 |
break; |
424 |
} |
425 |
$OLDPUNT=$PUNT; |
426 |
} |
427 |
#print $OLDPUNT; |
428 |
Return $OLDPUNT; |
429 |
} |
430 |
|
431 |
# Search ISIS for record containing search |
432 |
# Return a sorted array of MFN |
433 |
|
434 |
sub Search($search) |
435 |
{ |
436 |
|
437 |
$search=strtoupper($search); |
438 |
#print "Searching....".$search." - ".$self->{POSRX}->{1}."<br>"; |
439 |
# first search .x01 |
440 |
|
441 |
|
442 |
# Search in .N01 |
443 |
|
444 |
|
445 |
$fileN01=fopen($self->{isisdb}.".N01","r"); |
446 |
$offset=(($self->{POSRX}->{1}-1)*(8+2*$self->{ORDN}->{1}*14)); |
447 |
|
448 |
do |
449 |
{ |
450 |
rewind($fileN01); |
451 |
|
452 |
fseek($fileN01,$offset); |
453 |
|
454 |
$POS=$self->Read32($fileN01); |
455 |
$OCK=$self->Read16($fileN01); |
456 |
$IT=$self->Read16($fileN01); |
457 |
|
458 |
#print "<br>".$POS." - ".$OCK." - ".$IT; |
459 |
|
460 |
$OLDPUNT=$POS; |
461 |
for ($i=0;$i<$OCK;$i++) |
462 |
{ |
463 |
$KEY=fread($fileN01,10); |
464 |
|
465 |
$PUNT=$self->Read32($fileN01); |
466 |
|
467 |
#print " ## ".chop($KEY)."(".$PUNT."-".$OLDPUNT.") ## "; |
468 |
|
469 |
If (strcmp($search,chop($KEY))<0) |
470 |
{ |
471 |
break; |
472 |
} |
473 |
$OLDPUNT=$PUNT; |
474 |
} |
475 |
$offset=(($OLDPUNT-1)*(8+2*$self->{ORDN}->{1}*14)); |
476 |
} while ($OLDPUNT>0); |
477 |
#print $OLDPUNT; |
478 |
|
479 |
|
480 |
fclose($fileN01); |
481 |
|
482 |
# Now look for records in .L01 file |
483 |
$fileL01=fopen($self->{isisdb}.".L01","r"); |
484 |
rewind($fileL01); |
485 |
|
486 |
$offset=(-$OLDPUNT-1)*(12+$self->{ORDF}->{1}*18*2); |
487 |
fseek($fileL01,$offset); |
488 |
|
489 |
$POS=$self->Read32($fileL01); |
490 |
$OCK=$self->Read16($fileL01); |
491 |
$IT=$self->Read16($fileL01); |
492 |
$PS=$self->Read32($fileL01); |
493 |
#print "<br>POS:".$POS." ".$self->{ORDF}->{1}." "; |
494 |
for ($i=0;$i<$OCK;$i++) |
495 |
{ |
496 |
$KEY=fread($fileL01,10); |
497 |
|
498 |
#print $KEY." ### "; |
499 |
|
500 |
$INFO1=$self->Read32($fileL01); |
501 |
$INFO2=$self->Read32($fileL01); |
502 |
|
503 |
If (strcmp($search,chop($KEY))==0) |
504 |
{ |
505 |
break; |
506 |
} |
507 |
} |
508 |
|
509 |
fclose($fileL01); |
510 |
|
511 |
#print $INFO1."--".$INFO2; |
512 |
|
513 |
# Now look in .IFP for the MFN |
514 |
$fileIFP=fopen($self->{isisdb}.".IFP","r"); |
515 |
rewind($fileIFP); |
516 |
$offset=($INFO1-1)*512+($INFO2*4); |
517 |
fseek($fileIFP,$offset); |
518 |
|
519 |
$IFPBLK=$self->Read32($fileIFP); |
520 |
|
521 |
$IFPNXTB=$self->Read32($fileIFP); |
522 |
$IFPNXTP=$self->Read32($fileIFP); |
523 |
$IFPTOTP=$self->Read32($fileIFP); |
524 |
$IFPSEGP=$self->Read32($fileIFP); |
525 |
$IFPSEGC=$self->Read32($fileIFP); |
526 |
|
527 |
|
528 |
#print "<br>IFP:".$IFPBLK." # ".$IFPNXTB." - ".$IFPNXTP." - ".$IFPTOTP." - ".$IFPSEGP." - ".$IFPSEGC; |
529 |
|
530 |
rewind($fileIFP); |
531 |
$offset=($INFO1-1)*512+24+($INFO2*4); |
532 |
fseek($fileIFP,$offset); |
533 |
|
534 |
$j=24+($INFO2*4); |
535 |
$k=0; |
536 |
$l=1; |
537 |
$OLDPMFN=""; |
538 |
for ($i=0;$i<$IFPSEGP;$i++) |
539 |
{ |
540 |
$B1=$self->Read8($fileIFP); |
541 |
$B2=$self->Read8($fileIFP); |
542 |
$B3=$self->Read8($fileIFP); |
543 |
$B4=$self->Read8($fileIFP); |
544 |
$B5=$self->Read8($fileIFP); |
545 |
$B6=$self->Read8($fileIFP); |
546 |
$B7=$self->Read8($fileIFP); |
547 |
$B8=$self->Read8($fileIFP); |
548 |
|
549 |
$PMFN=$B1*65536+$B2*256+$B3; |
550 |
$PTAG=$B4*256+$B5; |
551 |
$POCC=$B6; |
552 |
$PCNT=$B7*256+$B8; |
553 |
|
554 |
if ($OLDPMFN!=$PMFN) |
555 |
{ |
556 |
if ($PMFN!=0) |
557 |
{ |
558 |
$self->{MFNArray}->{$l}=$PMFN; |
559 |
$OLDPMFN=$PMFN; |
560 |
$l+=1; |
561 |
} |
562 |
} |
563 |
|
564 |
$j=$j+8; |
565 |
#print "<br>".$PMFN."-".$PTAG." - ".$POCC." - ".$PCNT; |
566 |
#print "@@".$j."@@@@"; |
567 |
if ($j>=504) |
568 |
{ |
569 |
if ($IFPNXTB==0 && $IFPNXTP==0) |
570 |
{ |
571 |
$k=$k+1; |
572 |
rewind($fileIFP); |
573 |
$offset=($INFO1-1+$k)*512; |
574 |
fseek($fileIFP,$offset); |
575 |
$B=$self->Read32($fileIFP); |
576 |
#print "<br>-".$B."-<br>"; |
577 |
$j=0; |
578 |
} else |
579 |
{ |
580 |
rewind($fileIFP); |
581 |
$offset=($IFPNXTB-1)*512; |
582 |
fseek($fileIFP,$offset); |
583 |
|
584 |
$OLDIFPNXTB=$IFPNXTB; |
585 |
$OLDIFPNXTP=$IFPNXTP; |
586 |
|
587 |
$IFPBLK=$self->Read32($fileIFP); |
588 |
|
589 |
$IFPNXTB=$self->Read32($fileIFP); |
590 |
$IFPNXTP=$self->Read32($fileIFP); |
591 |
$IFPTOTP=$self->Read32($fileIFP); |
592 |
$IFPSEGP=$self->Read32($fileIFP); |
593 |
$IFPSEGC=$self->Read32($fileIFP); |
594 |
|
595 |
rewind($fileIFP); |
596 |
$offset=($OLDIFPNXTB-1)*512+24+($OLDIFPNXTP*4); |
597 |
fseek($fileIFP,$offset); |
598 |
|
599 |
$j=24+($OLDIFPNXTP*4); |
600 |
$k=0; |
601 |
$j=0; |
602 |
} |
603 |
} |
604 |
|
605 |
} |
606 |
fclose($fileIFP); |
607 |
return $l-1; |
608 |
} |
609 |
|
610 |
=cut |
611 |
|
612 |
# |
613 |
# XXX porting from php left-over: |
614 |
# |
615 |
# do I *REALLY* need those methods, or should I use |
616 |
# $self->{something} directly? |
617 |
# |
618 |
# Probably direct usage is better! |
619 |
# |
620 |
|
621 |
sub GetFieldName { |
622 |
my $self = shift; |
623 |
return $self->{FieldName}; |
624 |
} |
625 |
|
626 |
sub GetTagName { |
627 |
my $self = shift; |
628 |
return $self->{TagName}; |
629 |
} |
630 |
|
631 |
sub GetFieldTag { |
632 |
my $self = shift; |
633 |
return $self->{FieldTAG}; |
634 |
} |
635 |
|
636 |
sub GetNextMFN { |
637 |
my $self = shift; |
638 |
return $self->{NXTMFN}; |
639 |
} |
640 |
|
641 |
sub GetMFNArray { |
642 |
my $self = shift; |
643 |
return $self->{MFNArray}; |
644 |
} |
645 |
=begin php |
646 |
|
647 |
sub Read32($fileNB) |
648 |
{ |
649 |
$B1=ord(fread($fileNB,1)); |
650 |
$B2=ord(fread($fileNB,1)); |
651 |
$B3=ord(fread($fileNB,1)); |
652 |
$B4=ord(fread($fileNB,1)); |
653 |
|
654 |
if ($B4<=128) |
655 |
{ |
656 |
$value=$B1+$B2*256+$B3*65536+$B4*16777216; |
657 |
} else |
658 |
{ |
659 |
$value=$self->Not8($B1)+$self->Not8($B2)*256+$self->Not8($B3)*65536+$self->Not8($B4)*16777216; |
660 |
$value=-($value+1); |
661 |
} |
662 |
# print "(".$B1.",".$B2.",".$B3.",".$B4.":".$value.")"; |
663 |
|
664 |
return $value; |
665 |
} |
666 |
|
667 |
sub Read24($fileNB) |
668 |
{ |
669 |
$B1=ord(fread($fileNB,1)); |
670 |
$B2=ord(fread($fileNB,1)); |
671 |
$B3=ord(fread($fileNB,1)); |
672 |
|
673 |
$value=$B1+$B2*256+$B3*65536; |
674 |
|
675 |
# print "(".$B1.",".$B2.",".$B3.":".$value.")"; |
676 |
|
677 |
return $value; |
678 |
} |
679 |
|
680 |
sub Read16($fileNB) |
681 |
{ |
682 |
$B1=ord(fread($fileNB,1)); |
683 |
$B2=ord(fread($fileNB,1)); |
684 |
|
685 |
$value=$B1+$B2*256; |
686 |
# print "(".$B1.",".$B2.":".$value.")"; |
687 |
|
688 |
return $value; |
689 |
} |
690 |
|
691 |
sub Read8($fileNB) |
692 |
{ |
693 |
$B1=ord(fread($fileNB,1)); |
694 |
|
695 |
$value=$B1; |
696 |
# print "(".$value.")"; |
697 |
|
698 |
return $value; |
699 |
} |
700 |
|
701 |
sub Not8($value) |
702 |
{ |
703 |
$value=decbin($value); |
704 |
if (strlen($value)<8) |
705 |
{ |
706 |
$buffer=""; |
707 |
for($i=0;$i<(8-strlen($value));$i++) |
708 |
{ |
709 |
$buffer.="0"; |
710 |
} |
711 |
$value=$buffer.$value; |
712 |
} |
713 |
$value=ereg_replace("0","3",$value); |
714 |
$value=ereg_replace("1","0",$value); |
715 |
$value=ereg_replace("3","1",$value); |
716 |
$value=bindec($value); |
717 |
return $value; |
718 |
} |
719 |
} |
720 |
|
721 |
=cut |
722 |
|
723 |
1; |
724 |
__END__ |
725 |
|
726 |
=head1 BUGS |
727 |
|
728 |
This module has been very lightly tested. Use with caution and report bugs. |
729 |
|
730 |
=head1 AUTHOR |
731 |
|
732 |
Dobrica Pavlinusic |
733 |
CPAN ID: DPAVLIN |
734 |
dpavlin@rot13.org |
735 |
http://www.rot13.org/~dpavlin/ |
736 |
|
737 |
This module is based heavily on code from LIBISIS.PHP - Library to read ISIS files V0.1.1 |
738 |
written in php and (c) 2000 Franck Martin - <franck@sopac.org> released under LGPL. |
739 |
|
740 |
=head1 COPYRIGHT |
741 |
|
742 |
This program is free software; you can redistribute |
743 |
it and/or modify it under the same terms as Perl itself. |
744 |
|
745 |
The full text of the license can be found in the |
746 |
LICENSE file included with this module. |
747 |
|
748 |
|
749 |
=head1 SEE ALSO |
750 |
|
751 |
L<http://www.openisis.org|OpenIsis>, perl(1). |
752 |
|