| Geant4 Cross Reference |
1 // Copyright (C) 2010, Guy Barrand. All rights
2 // See the file tools.license for terms.
3
4 #ifndef tools_wroot_file
5 #define tools_wroot_file
6
7 #include "ifile"
8
9 #include "directory"
10
11 #include "infos"
12 #include "free_seg"
13
14 #include "../platform"
15
16 #include "../path"
17
18 #include <map>
19
20 #include <fcntl.h>
21 #include <errno.h>
22 #include <sys/stat.h>
23
24 #if defined(_MSC_VER) || defined(__MINGW32__)
25 #include <direct.h>
26 #include <io.h>
27 #else
28 #include <unistd.h>
29 #endif
30
31 namespace tools {
32 namespace wroot {
33
34 class file : public virtual ifile {
35 file& get_me() {return *this;} //_MSC_VER :
36 static int not_open() {return -1;}
37 static uint32 kBegin() {return 64;}
38 public:
39 static const std::string& s_class() {
40 static const std::string s_v("tools::wroot
41 return s_v;
42 }
43 virtual const std::string& s_cls() const {re
44 public: //ifile
45 virtual bool verbose() const {return m_verbo
46 virtual std::ostream& out() const {return m_
47
48 virtual bool byte_swap() const {return is_li
49 virtual bool set_pos(seek a_offset = 0,from
50 int whence = 0;
51 switch(a_from) {
52 case begin:
53 whence = SEEK_SET;
54 break;
55 case current:
56 whence = SEEK_CUR;
57 break;
58 case end:
59 whence = SEEK_END;
60 break;
61 }
62
63 #if defined(__linux__) && (__GLIBC__ == 2) &&
64 if (::lseek64(m_file, a_offset, whence) <
65 #elif defined(_MSC_VER) || defined(__MINGW32__
66 if (::_lseeki64(m_file, a_offset, whence)
67 #else
68 if (::lseek(m_file, a_offset, whence) < 0)
69 #endif
70 m_out << "tools::wroot::file::set_pos :"
71 << " cannot set position " << a_of
72 << " in file " << sout(m_path) <<
73 << std::endl;
74 return false;
75 }
76 return true;
77 }
78
79 virtual seek END() const {return m_END;}
80 virtual void set_END(seek a_end){
81 m_END = a_end;
82
83 if(m_free_segs.empty()) {
84 m_out << "tools::wroot::file::set_END :"
85 << " free_seg list should not be e
86 << std::endl;
87 } else {
88 free_seg* end_seg = m_free_segs.back();
89 if(end_seg->last()!=START_BIG_FILE()) {
90 m_out << "tools::wroot::file::set_END
91 << " last free_seg is not the en
92 << " free_seg list looks corrupt
93 << std::endl;
94 } else {
95 m_free_segs.back()->set_first(m_END);
96 }
97 }
98 }
99
100 virtual bool write_buffer(const char* a_buff
101 // Write a buffer to the file. This is the
102 #ifdef _MSC_VER
103 typedef int ssize_t;
104 #endif
105 ssize_t siz;
106 while ((siz = ::write(m_file,a_buffer,a_le
107 error_number() == EINTR) reset_err
108
109 if(siz < 0) {
110 m_out << "tools::wroot::file::write_buff
111 << " error writing to file " << so
112 << std::endl;
113 return false;
114 }
115 if(siz!=(ssize_t)a_length) {
116 m_out << "tools::wroot::file::write_buff
117 << "error writing all requested byt
118 << ", wrote " << long_out(siz) << "
119 << std::endl;
120 return false;
121 }
122 //m_bytes_write += siz;
123 return true;
124 }
125
126 virtual uint32 version() const {
127 // Return version id as an integer, i.e. "
128 static const uint32 ROOT_MAJOR_VERSION = 4
129 static const uint32 ROOT_MINOR_VERSION = 0
130 static const uint32 ROOT_PATCH_VERSION = 0
131 return
132 10000 * ROOT_MAJOR_VERSION +
133 100 * ROOT_MINOR_VERSION +
134 ROOT_PATCH_VERSION;
135 }
136
137 virtual bool synchronize(){
138 // Synchornize a file's in-core and on-dis
139 #ifdef _MSC_VER
140 if(::_commit(m_file)) {
141 m_out << "tools::wroot::file::synchroniz
142 << " in _commit() for file " << so
143 << std::endl;
144 return false;
145 }
146 #elif defined(__MINGW32__)
147 return true;
148 #else
149 if (::fsync(m_file) < 0) {
150 m_out << "tools::wroot::file::synchroniz
151 << " error in fsync() for file " <
152 << std::endl;
153 return false;
154 }
155 #endif
156 return true;
157 }
158
159 virtual bool ziper(char a_key,compress_func&
160 std::map<char,compress_func>::const_iterat
161 if(it==m_zipers.end()) {
162 a_func = 0;
163 return false;
164 }
165 a_func = (*it).second;
166 return true;
167 }
168 virtual uint32 compression() const {return m
169 virtual void compress_buffer(const buffer& a
170 //NOTE: if(kdelete) delete [] kbuf;
171
172 a_kbuf = 0;
173 a_klen = 0;
174 a_kdel = false;
175
176 uint32 nbytes = a_buffer.length();
177 uint32 cxlevel = m_compress;
178 if(cxlevel && (nbytes>256)) {
179 compress_func func;
180 if(!ziper('Z',func)) {
181 //m_out << "tools::wroot::file::compre
182 // << " zlib ziper not found."
183 // << std::endl;
184 a_kbuf = (char*)a_buffer.buf();
185 a_klen = a_buffer.length();
186 a_kdel = false;
187 } else {
188 const uint32 kMAXBUF = 0xffffff;
189 const uint32 HDRSIZE = 9;
190 uint32 nbuffers = nbytes/kMAXBUF;
191 uint32 buf_out_size = kMAXBUF+HDRSIZE+
192 uint32 buflen = (nbuffers+1)*buf_out_s
193 a_kbuf = new char[buflen];
194 a_kdel = true;
195 char* src = (char*)a_buffer.buf();
196 char* tgt = a_kbuf;
197 uint32 nzip = 0;
198 for(uint32 i=0;i<=nbuffers;i++) {
199 uint32 bufmax = ((i == nbuffers) ? n
200 uint32 nout;
201 if(!zip(m_out,func,cxlevel,bufmax,sr
202 delete [] a_kbuf;
203 a_kbuf = (char*)a_buffer.buf();
204 a_klen = a_buffer.length();
205 a_kdel = false;
206 return;
207 }
208 tgt += nout; //nout includes HDRSIZE
209 a_klen += nout;
210 src += kMAXBUF;
211 nzip += kMAXBUF;
212 }
213 if(a_klen>=a_buffer.length()) {
214 //NOTE: It is in the ROOT/IO specifi
215 // are detected at read time by
216 // the overall output size (fNb
217 // By using the zlib-ng compres
218 // output size (a_klen here at
219 // induces problem when reading
220 delete [] a_kbuf;
221 a_kbuf = (char*)a_buffer.buf();
222 a_klen = a_buffer.length();
223 a_kdel = false;
224 }
225 }
226 } else {
227 a_kbuf = (char*)a_buffer.buf();
228 a_klen = a_buffer.length();
229 a_kdel = false;
230 }
231 }
232 public:
233 file(std::ostream& a_out,const std::string&
234 :m_out(a_out)
235 ,m_path(a_path)
236 ,m_verbose(a_verbose)
237 ,m_file(not_open())
238 //,m_bytes_write(0)
239 ,m_root_directory(get_me(),nosuffix(a_path),
240 // begin of record :
241 ,m_version(0)
242 ,m_BEGIN(0)
243 ,m_END(0)
244 ,m_seek_free(0)
245 ,m_nbytes_free(0)
246 ,m_nbytes_name(0)
247 ,m_units(4)
248 ,m_compress(1)
249 ,m_seek_info(0)
250 ,m_nbytes_info(0)
251 {
252 #ifdef TOOLS_MEM
253 mem::increment(s_class().c_str());
254 #endif
255
256 m_version = version();
257
258 if(access_path(m_path,kFileExists)) unlink
259
260 if(!m_root_directory.is_valid()) {
261 m_out << "tools::wroot::file::file :"
262 << " " << sout(m_path) << " root d
263 << std::endl;
264 return;
265 }
266
267 m_file = _open(a_path.c_str(),
268 #if defined(_MSC_VER) || defined(__MINGW32__)
269 O_RDWR | O_CREA
270 #else
271 O_RDWR | O_CREA
272 #endif
273 );
274 if(m_file==not_open()) {
275 m_out << "tools::wroot::file::file :"
276 << " can't open " << sout(a_path)
277 << std::endl;
278 return;
279 }
280
281 //initialize :
282
283 m_BEGIN = kBegin(); // First used word in
284 m_END = m_BEGIN; // Pointer to end of fi
285
286 m_free_segs.push_back(new free_seg(m_out,m
287
288 // Write Directory info :
289 uint32 namelen =
290 key::std_string_record_size(m_path) +
291 key::std_string_record_size(m_title);
292 uint32 nbytes = namelen + m_root_directory
293
294 //TUUID version 1:
295 nbytes += sizeof(unsigned int);
296 nbytes += 2*sizeof(unsigned short);
297 nbytes += 8*sizeof(unsigned char);
298
299 wroot::key key(m_out,*this,0,m_path,m_titl
300
301 // m_nbytes_name = start point of director
302 m_nbytes_name = key.key_length() + namelen
303 m_root_directory.set_nbytes_name(m_nbytes_
304 m_root_directory.set_seek_directory(key.se
305
306 //the below write 45 bytes at BOF (Begin O
307 if(!write_header()) { //need m_nbytes_name
308 m_out << "tools::wroot::file::file :"
309 << " can't write file header."
310 << std::endl;
311 return;
312 }
313
314 {char* pos = key.data_buffer();
315 wbuf wb(m_out,byte_swap(),key.eob(),pos);
316 if(!wb.write(m_path)) return;
317 if(!wb.write(m_title)) return;
318 if(!m_root_directory.to_buffer(wb)) return
319 //TUUID version 1:
320 if(!wb.write((unsigned int)0)) return;
321 if(!wb.write((unsigned short)0)) return;
322 if(!wb.write((unsigned short)0)) return;
323 {for(size_t count=0;count<8;count++) if(!wb
324
325 if(m_verbose) {
326 m_out << "tools::wroot::file::file :"
327 << " write key ("
328 << namelen
329 << ", "
330 << m_root_directory.record_size()
331 << ", "
332 << nbytes
333 << ", "
334 << m_nbytes_name
335 << ", "
336 << key.seek_key()
337 << ")."
338 << std::endl;
339 }
340
341 key.set_cycle(1);
342 if(!key.write_self(*this)) {
343 m_out << "tools::wroot::file::file :"
344 << " key.write_self() failed."
345 << std::endl;
346 return;
347 }
348
349 //the below write at kBegin + nbytes.
350 //64+52
351 uint32 n;
352 if(!key.write_file(*this,n)) {
353 m_out << "tools::wroot::file::file :"
354 << " can't write key in file."
355 << std::endl;
356 return;
357 }
358 //::printf("debug : file::file : write key
359
360 }
361 virtual ~file() {
362 close();
363 #ifdef TOOLS_MEM
364 mem::decrement(s_class().c_str());
365 #endif
366 }
367 protected:
368 file(const file& a_from)
369 :ifile(a_from)
370 ,m_out(a_from.m_out)
371 ,m_root_directory(get_me())
372 {
373 #ifdef TOOLS_MEM
374 mem::increment(s_class().c_str());
375 #endif
376 }
377 file& operator=(const file&){return *this;}
378 public:
379 const std::string& path() const {return m_pa
380
381 void set_compression(uint32 a_level) {
382 // level = 0 objects written to this file
383 // level = 1 minimal compression level but
384 // ....
385 // level = 9 maximal compression level but
386 m_compress = a_level;
387 if(m_compress>9) m_compress = 9;
388 }
389
390 bool is_open() const {return (m_file==not_op
391
392 void close() {
393 if(m_file==not_open()) return;
394 m_root_directory.close();
395
396 if(m_free_segs.size()) {
397 if(!write_free_segments()) {
398 m_out << "tools::wroot::file::close :"
399 << " can't write free segments."
400 << std::endl;
401 }
402 if(!write_header()) { // Now write file
403 m_out << "tools::wroot::file::close :"
404 << " can't write file header."
405 << std::endl;
406 }
407 }
408
409 {std::list<free_seg*>::iterator it;
410 for(it=m_free_segs.begin();
411 it!=m_free_segs.end();
412 it = m_free_segs.erase(it)) {
413 delete (*it);
414 }}
415
416 ::close(m_file);
417 m_file = not_open();
418 }
419
420 directory& dir() {return m_root_directory;}
421 const directory& dir() const {return m_root_
422
423 bool write(uint32& a_nbytes){
424 // Write memory objects to this file :
425 // Loop on all objects in m_root_director
426 // A new key is created in the directorie
427 // for each object.
428 // The list of keys is then saved on the
429 // as a single data record.
430 // The directory header info is rewritten
431 // //The linked list of FREE segments is
432 // The file header is written (bytes 1->m
433 a_nbytes = 0;
434
435 if(m_verbose) {
436 m_out << "tools::wroot::file::write :"
437 << " writing Name=" << sout(m_path
438 << " Title=" << sout(m_title) << "
439 << std::endl;
440 }
441
442 uint32 nbytes;
443 if(!m_root_directory.write(nbytes)) return
444
445 if(!write_streamer_infos()) {
446 m_out << "tools::wroot::file::write :"
447 << " write_streamer_infos failed."
448 << std::endl;
449 return false;
450 }
451
452 if(!write_free_segments()) {
453 m_out << "tools::wroot::file::write :"
454 << " can't write free segments."
455 << std::endl;
456 return false;
457 }
458
459 if(!write_header()) { //write 45 bytes at
460 m_out << "tools::wroot::file::write :"
461 << " can't write file header."
462 << std::endl;
463 return false;
464 }
465
466 a_nbytes = nbytes;
467 return true;
468 }
469
470 bool add_ziper(char a_key,compress_func a_fu
471 std::map<char,compress_func>::const_iterat
472 if(it!=m_zipers.end()) {
473 //(*it).second = a_func; //override ?
474 return false;
475 } else {
476 m_zipers[a_key] = a_func;
477 return true;
478 }
479 }
480 protected:
481 enum EAccessMode {
482 kFileExists = 0,
483 kExecutePermission = 1,
484 kWritePermission = 2,
485 kReadPermission = 4
486 };
487 static bool access_path(const std::string& a
488 // Returns true if one can access a file u
489 // Mode is the same as for the WinNT acces
490 #ifdef _MSC_VER
491 return (::_access(a_path.c_str(),a_mode) =
492 #else
493 return (::access(a_path.c_str(),a_mode) ==
494 #endif
495 }
496 static bool unlink(const std::string& a_path
497 // Unlink, i.e. remove, a file or director
498 // false in case of failure.
499 struct stat finfo;
500 if (::stat(a_path.c_str(),&finfo) < 0) ret
501 #ifdef _MSC_VER
502 if (finfo.st_mode & S_IFDIR)
503 return (::_rmdir(a_path.c_str())==-1 ? f
504 else
505 return (::unlink(a_path.c_str())==-1 ? f
506 #else
507 if (S_ISDIR(finfo.st_mode))
508 return (::rmdir(a_path.c_str())==-1 ? fa
509 else
510 return (::unlink(a_path.c_str())==-1 ? f
511 #endif
512 }
513
514 static int _open(const char* a_name,int a_fl
515 #if defined(__linux__) && (__GLIBC__ == 2) &&
516 return ::open64(a_name,a_flags,a_mode);
517 #else
518 return ::open(a_name,a_flags,a_mode);
519 #endif
520 }
521 bool write_header() {
522 const char root[] = "root";
523 //char psave[kBegin()];
524 char psave[128];
525 const char* eob = psave + kBegin();
526 char* pos = psave;
527 ::memcpy(pos,root,4); pos += 4;
528 uint32 vers = m_version;
529 if((m_END>START_BIG_FILE()) ||
530 (m_seek_free>START_BIG_FILE()) ||
531 (m_seek_info>START_BIG_FILE()) ){
532 vers += 1000000;
533 m_units = 8;
534 }
535 wbuf wb(m_out,byte_swap(),eob,pos);
536 if(!wb.write(vers)) return false;
537 if(!wb.write((seek32)m_BEGIN)) return fals
538 if(vers>1000000) {
539 if(!wb.write(m_END)) return false;
540 if(!wb.write(m_seek_free)) return false;
541 } else {
542 if(!wb.write((seek32)m_END)) return fals
543 if(!wb.write((seek32)m_seek_free)) retur
544 }
545 if(!wb.write(m_nbytes_free)) return false;
546 //int nfree = fFreeSegments.size();
547 uint32 nfree = 0; //FIXME
548 if(!wb.write(nfree)) return false;
549 if(!wb.write(m_nbytes_name)) return false;
550 if(!wb.write(m_units)) return false;
551 if(!wb.write(m_compress)) return false;
552 if(vers>1000000) {
553 if(!wb.write(m_seek_info)) return false;
554 } else {
555 if(!wb.write((seek32)m_seek_info)) retur
556 }
557 if(!wb.write(m_nbytes_info)) return false;
558 if(!set_pos()) return false; //BOF
559 uint32 nbytes = uint32(pos - psave);
560 //::printf("debug : write_header : %d\n",n
561 if(!write_buffer(psave,nbytes)) return fal
562 if(!synchronize()) return false;
563 return true;
564 }
565
566 bool write_streamer_infos() {
567 obj_list<streamer_info> sinfos;
568 fill_infos(sinfos,m_out);
569
570 if(sinfos.empty()) return false;
571
572 buffer bref(m_out,byte_swap(),256);
573
574 if(!sinfos.stream(bref)) {
575 m_out << "tools::wroot::file::write_stre
576 << " cannot stream obj_list<stream
577 << std::endl;
578 return false;
579 }
580 uint32 nbytes = bref.length();
581
582 wroot::key key(m_out,*this,
583 m_root_directory.seek_direc
584 "StreamerInfo","",
585 sinfos.store_cls(),
586 nbytes); // It does a (*thi
587 if(!key.seek_key()) return false;
588
589 if(!bref.displace_mapped(key.key_length())
590
591 ::memcpy(key.data_buffer(),bref.buf(),nbyt
592
593 //key.set_cycle(1);
594 if(!key.write_self(*this)) {
595 m_out << "tools::wroot::file::write_stre
596 << " key.write_self() failed."
597 << std::endl;
598 return false;
599 }
600
601 m_seek_info = key.seek_key();
602 m_nbytes_info = key.number_of_bytes();
603 //FIXME sumBuffer(key.objectSize());
604
605 uint32 n;
606 if(!key.write_file(*this,n)) return false;
607 if(!n) return false;
608
609 return true;
610 }
611
612 bool make_free_seg(seek a_first,seek a_last)
613 // Mark unused bytes on the file :
614 // The list of free segments is in the m_
615 // When an object is deleted from the fil
616 // into the FREE linked list (m_free_segs
617 // of a chain of consecutive free segmen
618 // time, the first 4 bytes of the freed r
619 // are overwritten by GAPSIZE where
620 // GAPSIZE = -(Number of bytes occupied
621
622 if(m_free_segs.empty()) {
623 m_out << "tools::wroot::file::make_free_
624 << " free_seg list should not be e
625 << std::endl;
626 return false;
627 }
628
629 free_seg* newfree = add_free(m_free_segs,a
630 if(!newfree) {
631 m_out << "tools::wroot::file::make_free_
632 << " add_free failed."
633 << std::endl;
634 return false;
635 }
636
637 seek nfirst = newfree->first();
638 seek nlast = newfree->last();
639
640 seek _nbytes = nlast-nfirst+1;
641 if(_nbytes>START_BIG_FILE()) _nbytes = STA
642 int nbytes = -int(_nbytes);
643
644 int nb = sizeof(int);
645
646 char psave[128];
647 const char* eob = psave + nb;
648 char* pos = psave;
649
650 wbuf wb(m_out,byte_swap(),eob,pos);
651 if(!wb.write(nbytes)) return false;
652
653 if(nlast == (m_END-1)) m_END = nfirst;
654 if(!set_pos(nfirst)) return false;
655 if(!write_buffer(psave,nb)) return false;
656 if(!synchronize()) return false;
657 return true;
658 }
659
660 bool write_free_segments(){
661 // The linked list of FREE segments (fFre
662
663 // Delete old record if it exists :
664 if(m_seek_free){
665 if(!make_free_seg(m_seek_free, m_seek_fr
666 m_out << "tools::wroot::file::write_fr
667 << " key.write_self() failed."
668 << std::endl;
669 return false;
670 }
671 }
672
673 //::printf("debug : write_free_segments :
674
675 uint32 nbytes = 0;
676 {tools_lforcit(free_seg*,m_free_segs,it) {
677 nbytes += (*it)->record_size();
678 //::printf("debug : write_free_segments
679 // (*it)->first(),(*it)->last())
680 }}
681 if(!nbytes) return true;
682
683 wroot::key key(m_out,*this,
684 m_root_directory.seek_direc
685 m_path,m_title,"TFile",
686 nbytes); // It does a (*thi
687 if(!key.seek_key()) return false;
688
689 {char* pos = key.data_buffer();
690 wbuf wb(m_out,byte_swap(),key.eob(),pos);
691 tools_lforcit(free_seg*,m_free_segs,it) {
692 if(!(*it)->fill_buffer(wb)) return false
693 }}
694
695 //key.set_cycle(1);
696 if(!key.write_self(*this)) {
697 m_out << "tools::wroot::file::write_free
698 << " key.write_self() failed."
699 << std::endl;
700 return false;
701 }
702
703 m_seek_free = key.seek_key();
704 m_nbytes_free = key.number_of_bytes();
705 if(m_verbose) {
706 m_out << "tools::wroot::file::write_free
707 << " write key." << std::endl;
708 }
709
710 uint32 n;
711 if(!key.write_file(*this,n)) return false;
712 if(!n) return false;
713
714 return true;
715 }
716
717 static bool zip(std::ostream& a_out,
718 compress_func a_func,
719 int a_level,
720 uint32 a_srcsize,char* a_src
721 uint32 a_tgtsize,char* a_tgt
722 uint32& a_irep){
723
724 // from Rio/Bits/R__zip using zlib.
725
726 const uint32 HDRSIZE = 9;
727
728 if(a_tgtsize<HDRSIZE) {
729 a_out << "tools::wroot::file::zip :"
730 << " target buffer too small."
731 << std::endl;
732 a_irep = 0;
733 return false;
734 }
735 if(a_srcsize>0xffffff) {
736 a_out << "tools::wroot::file::zip :"
737 << " source buffer too big."
738 << std::endl;
739 a_irep = 0;
740 return false;
741 }
742
743 uint32 out_size;
744 if(!a_func(a_out,a_level,
745 a_srcsize,a_src,
746 a_tgtsize,a_tgt+HDRSIZE,
747 out_size)) {
748 a_out << "tools::wroot::file::zip :"
749 << " zipper failed."
750 << std::endl;
751 a_irep = 0;
752 return false;
753 }
754
755 if((HDRSIZE+out_size)>a_tgtsize) {
756 a_out << "tools::wroot::file::zip :"
757 << " target buffer overflow."
758 << std::endl;
759 a_irep = 0;
760 return false;
761 }
762
763 // HEADER :
764 a_tgt[0] = 'Z'; // Signature ZLib
765 a_tgt[1] = 'L';
766 a_tgt[2] = 8; //DEFLATE
767
768 a_tgt[3] = (char)(out_size & 0xff);
769 a_tgt[4] = (char)((out_size >> 8) & 0xff);
770 a_tgt[5] = (char)((out_size >> 16) & 0xff)
771
772 a_tgt[6] = (char)(a_srcsize & 0xff);
773 a_tgt[7] = (char)((a_srcsize >> 8) & 0xff)
774 a_tgt[8] = (char)((a_srcsize >> 16) & 0xff
775
776 a_irep = HDRSIZE+out_size;
777
778 return true;
779 }
780
781 #if defined(__sun) && !defined(__linux__) && (
782 int error_number() {return ::errno;}
783 void reset_error_number() {::errno = 0;}
784 #else
785 int error_number() {return errno;}
786 void reset_error_number() {errno = 0;}
787 #endif
788
789 protected:
790 std::ostream& m_out;
791 std::string m_path;
792 bool m_verbose;
793 int m_file;
794 //uint64 m_bytes_write; //Number of bytes wr
795 std::string m_title; //must be before the be
796 directory m_root_directory;
797 std::map<char,compress_func> m_zipers;
798 std::list<free_seg*> m_free_segs; //Free seg
799 // begin of record :
800 // "root"
801 uint32 m_version; //File format versio
802 seek m_BEGIN; //First used byte in
803 seek m_END; //Last used byte in
804 seek m_seek_free; //Location on disk o
805 uint32 m_nbytes_free; //Number of bytes fo
806 //int nfree
807 uint32 m_nbytes_name; //Number of bytes in
808 char m_units; //Number of bytes fo
809 uint32 m_compress; //(=1 file is compre
810 seek m_seek_info; //Location on disk o
811 uint32 m_nbytes_info; //Number of bytes fo
812 };
813
814
815 }}
816
817 #endif
818
819 //doc
820 //
821 // A ROOT file is a suite of consecutive data
822 // format (see also the TKey class);
823 // TKey ---------------------
824 // byte 1->4 Nbytes = Length of compr
825 // 5->6 Version = TKey version id
826 // 7->10 ObjLen = Length of uncom
827 // 11->14 Datime = Date and time w
828 // 15->16 KeyLen = Length of the k
829 // 17->18 Cycle = Cycle of key
830 // 19->22 SeekKey = Pointer to reco
831 // 23->26 SeekPdir = Pointer to dire
832 // 27->27 lname = Number of bytes
833 // 28->.. ClassName = Object Class Na
834 // ..->.. lname = Number of bytes
835 // ..->.. Name = lName bytes wit
836 // ..->.. lTitle = Number of bytes
837 // ..->.. Title = Title of the ob
838 // -----> DATA = Data bytes asso
839 //
840 // The first data record starts at byte fBEGI
841 // Bytes 1->kBegin contain the file descripti
842 // byte 1->4 "root" = Root file i
843 // 5->8 fVersion = File format
844 // 9->12 fBEGIN = Pointer to
845 // 13->16 fEND = Pointer to
846 // 17->20 fSeekFree = Pointer to
847 // 21->24 fNbytesFree = Number of b
848 // 25->28 nfree = Number of f
849 // 29->32 fNbytesName = Number of b
850 // 33->33 fUnits = Number of b
851 // 34->37 fCompress = Zip compres
852 //