src/common/tarstrm.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        tarstrm.cpp
   3 // Purpose:     Streams for Tar files
   4 // Author:      Mike Wetherell
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 2004 Mike Wetherell
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14   #pragma hdrstop
  15 #endif
  16
  17 #if wxUSE_TARSTREAM
  18
  19 #include "wx/tarstrm.h"
  20
  21 #ifndef WX_PRECOMP
  22     #include "wx/intl.h"
  23     #include "wx/log.h"
  24     #include "wx/utils.h"
  25 #endif
  26
  27 #include "wx/buffer.h"
  28 #include "wx/datetime.h"
  29 #include "wx/ptr_scpd.h"
  30 #include "wx/filename.h"
  31
  32 #include <ctype.h>
  33
  34 #ifdef __UNIX__
  35 #include <grp.h>
  36 #endif
  37
  38
  39 /////////////////////////////////////////////////////////////////////////////
  40 // constants
  41
  42 enum {
  43     TAR_NAME,
  44     TAR_MODE,
  45     TAR_UID,
  46     TAR_GID,
  47     TAR_SIZE,
  48     TAR_MTIME,
  49     TAR_CHKSUM,
  50     TAR_TYPEFLAG,
  51     TAR_LINKNAME,
  52     TAR_MAGIC,
  53     TAR_VERSION,
  54     TAR_UNAME,
  55     TAR_GNAME,
  56     TAR_DEVMAJOR,
  57     TAR_DEVMINOR,
  58     TAR_PREFIX,
  59     TAR_UNUSED,
  60     TAR_NUMFIELDS
  61 };
  62
  63 enum {
  64     TAR_BLOCKSIZE = 512
  65 };
  66
  67 // checksum type
  68 enum {
  69     SUM_UNKNOWN,
  70     SUM_UNSIGNED,
  71     SUM_SIGNED
  72 };
  73
  74 // type of input tar
  75 enum {
  76     TYPE_OLDTAR,    // fields after TAR_LINKNAME are invalid
  77     TYPE_GNUTAR,    // all fields except TAR_PREFIX are valid
  78     TYPE_USTAR      // all fields are valid
  79 };
  80
  81 // signatures
  82 static const char *USTAR_MAGIC   = "ustar";
  83 static const char *USTAR_VERSION = "00";
  84 static const char *GNU_MAGIC     = "ustar ";
  85 static const char *GNU_VERION    = " ";
  86
  87 IMPLEMENT_DYNAMIC_CLASS(wxTarEntry, wxArchiveEntry)
  88 IMPLEMENT_DYNAMIC_CLASS(wxTarClassFactory, wxArchiveClassFactory)
  89
  90
  91 /////////////////////////////////////////////////////////////////////////////
  92 // Class factory
  93
  94 static wxTarClassFactory g_wxTarClassFactory;
  95
  96 wxTarClassFactory::wxTarClassFactory()
  97 {
  98     if (this == &g_wxTarClassFactory)
  99         PushFront();
 100 }
 101
 102 const wxChar * const *
 103 wxTarClassFactory::GetProtocols(wxStreamProtocolType type) const
 104 {
 105     static const wxChar *protocols[] = { _T("tar"), NULL };
 106     static const wxChar *mimetypes[] = { _T("application/x-tar"), NULL };
 107     static const wxChar *fileexts[]  = { _T(".tar"), NULL };
 108     static const wxChar *empty[]     = { NULL };
 109
 110     switch (type) {
 111         case wxSTREAM_PROTOCOL: return protocols;
 112         case wxSTREAM_MIMETYPE: return mimetypes;
 113         case wxSTREAM_FILEEXT:  return fileexts;
 114         default:                return empty;
 115     }
 116 }
 117
 118
 119 /////////////////////////////////////////////////////////////////////////////
 120 // tar header block
 121
 122 typedef wxFileOffset wxTarNumber;
 123
 124 struct wxTarField { const wxChar *name; int pos; };
 125
 126 class wxTarHeaderBlock
 127 {
 128 public:
 129     wxTarHeaderBlock()
 130         { memset(data, 0, sizeof(data)); }
 131     wxTarHeaderBlock(const wxTarHeaderBlock& hb)
 132         { memcpy(data, hb.data, sizeof(data)); }
 133
 134     bool Read(wxInputStream& in);
 135     bool Write(wxOutputStream& out);
 136     inline bool WriteField(wxOutputStream& out, int id);
 137
 138     bool IsAllZeros() const;
 139     wxUint32 Sum(bool SignedSum = false);
 140     wxUint32 SumField(int id);
 141
 142     char *Get(int id) { return data + fields[id].pos + id; }
 143     static size_t Len(int id) { return fields[id + 1].pos - fields[id].pos; }
 144     static const wxChar *Name(int id) { return fields[id].name; }
 145     static size_t Offset(int id) { return fields[id].pos; }
 146
 147     bool SetOctal(int id, wxTarNumber n);
 148     wxTarNumber GetOctal(int id);
 149     bool SetPath(const wxString& name, wxMBConv& conv);
 150
 151 private:
 152     char data[TAR_BLOCKSIZE + TAR_NUMFIELDS];
 153     static const wxTarField fields[];
 154     static void check();
 155 };
 156
 157 wxDEFINE_SCOPED_PTR_TYPE(wxTarHeaderBlock)
 158
 159 // A table giving the field names and offsets in a tar header block
 160 const wxTarField wxTarHeaderBlock::fields[] =
 161 {
 162     { _T("name"), 0 },       // 100
 163     { _T("mode"), 100 },     // 8
 164     { _T("uid"), 108 },      // 8
 165     { _T("gid"), 116 },      // 8
 166     { _T("size"), 124 },     // 12
 167     { _T("mtime"), 136 },    // 12
 168     { _T("chksum"), 148 },   // 8
 169     { _T("typeflag"), 156 }, // 1
 170     { _T("linkname"), 157 }, // 100
 171     { _T("magic"), 257 },    // 6
 172     { _T("version"), 263 },  // 2
 173     { _T("uname"), 265 },    // 32
 174     { _T("gname"), 297 },    // 32
 175     { _T("devmajor"), 329 }, // 8
 176     { _T("devminor"), 337 }, // 8
 177     { _T("prefix"), 345 },   // 155
 178     { _T("unused"), 500 },   // 12
 179     { NULL, TAR_BLOCKSIZE }
 180 };
 181
 182 void wxTarHeaderBlock::check()
 183 {
 184 #if 0
 185     wxCOMPILE_TIME_ASSERT(
 186         WXSIZEOF(fields) == TAR_NUMFIELDS + 1,
 187         Wrong_number_of_elements_in_fields_table
 188     );
 189 #endif
 190 }
 191
 192 bool wxTarHeaderBlock::IsAllZeros() const
 193 {
 194     const char *p = data;
 195     for (size_t i = 0; i < sizeof(data); i++)
 196         if (p[i])
 197             return false;
 198     return true;
 199 }
 200
 201 wxUint32 wxTarHeaderBlock::Sum(bool SignedSum /*=false*/)
 202 {
 203     // the chksum field itself should be blanks during the calculation
 204     memset(Get(TAR_CHKSUM), ' ', Len(TAR_CHKSUM));
 205     const char *p = data;
 206     wxUint32 n = 0;
 207
 208     if (SignedSum)
 209         for (size_t i = 0; i < sizeof(data); i++)
 210             n += (signed char)p[i];
 211     else
 212         for (size_t i = 0; i < sizeof(data); i++)
 213             n += (unsigned char)p[i];
 214
 215     return n;
 216 }
 217
 218 wxUint32 wxTarHeaderBlock::SumField(int id)
 219 {
 220     unsigned char *p = (unsigned char*)Get(id);
 221     unsigned char *q = p + Len(id);
 222     wxUint32 n = 0;
 223
 224     while (p < q)
 225         n += *p++;
 226
 227     return n;
 228 }
 229
 230 bool wxTarHeaderBlock::Read(wxInputStream& in)
 231 {
 232     bool ok = true;
 233
 234     for (int id = 0; id < TAR_NUMFIELDS && ok; id++)
 235         ok = in.Read(Get(id), Len(id)).LastRead() == Len(id);
 236
 237     return ok;
 238 }
 239
 240 bool wxTarHeaderBlock::Write(wxOutputStream& out)
 241 {
 242     bool ok = true;
 243
 244     for (int id = 0; id < TAR_NUMFIELDS && ok; id++)
 245         ok = WriteField(out, id);
 246
 247     return ok;
 248 }
 249
 250 bool wxTarHeaderBlock::WriteField(wxOutputStream& out, int id)
 251 {
 252     return out.Write(Get(id), Len(id)).LastWrite() == Len(id);
 253 }
 254
 255 wxTarNumber wxTarHeaderBlock::GetOctal(int id)
 256 {
 257     wxTarNumber n = 0;
 258     const char *p = Get(id);
 259     while (*p == ' ')
 260         p++;
 261     while (*p >= '0' && *p < '8')
 262         n = (n << 3) | (*p++ - '0');
 263     return n;
 264 }
 265
 266 bool wxTarHeaderBlock::SetOctal(int id, wxTarNumber n)
 267 {
 268     // set an octal field, return true if the number fits
 269     char *field = Get(id);
 270     char *p = field + Len(id);
 271     *--p = 0;
 272     while (p > field) {
 273         *--p = char('0' + (n & 7));
 274         n >>= 3;
 275     }
 276     return n == 0;
 277 }
 278
 279 bool wxTarHeaderBlock::SetPath(const wxString& name, wxMBConv& conv)
 280 {
 281     bool badconv = false;
 282
 283 #if wxUSE_UNICODE
 284     wxCharBuffer nameBuf = name.mb_str(conv);
 285
 286     // if the conversion fails make an approximation
 287     if (!nameBuf) {
 288         badconv = true;
 289         size_t len = name.length();
 290         wxCharBuffer approx(len);
 291         for (size_t i = 0; i < len; i++)
 292             approx.data()[i] = name[i] & ~0x7F ? '_' : name[i];
 293         nameBuf = approx;
 294     }
 295
 296     const char *mbName = nameBuf;
 297 #else
 298     const char *mbName = name.c_str();
 299     (void)conv;
 300 #endif
 301
 302     bool fits;
 303     bool notGoingToFit = false;
 304     size_t len = strlen(mbName);
 305     size_t maxname = Len(TAR_NAME);
 306     size_t maxprefix = Len(TAR_PREFIX);
 307     size_t i = 0;
 308     size_t nexti = 0;
 309
 310     for (;;) {
 311         fits = i < maxprefix && len - i <= maxname;
 312
 313         if (!fits) {
 314             const char *p = strchr(mbName + i, '/');
 315             if (p)
 316                 nexti = p - mbName + 1;
 317             if (!p || nexti - 1 > maxprefix)
 318                 notGoingToFit = true;
 319         }
 320
 321         if (fits || notGoingToFit) {
 322             strncpy(Get(TAR_NAME), mbName + i, maxname);
 323             if (i > 0)
 324                 strncpy(Get(TAR_PREFIX), mbName, i - 1);
 325             break;
 326         }
 327
 328         i = nexti;
 329     }
 330
 331     return fits && !badconv;
 332 }
 333
 334
 335 /////////////////////////////////////////////////////////////////////////////
 336 // Some helpers
 337
 338 static wxFileOffset RoundUpSize(wxFileOffset size, int factor = 1)
 339 {
 340     wxFileOffset chunk = TAR_BLOCKSIZE * factor;
 341     return ((size + chunk - 1) / chunk) * chunk;
 342 }
 343
 344 static wxString GroupName()
 345 {
 346 #ifdef __UNIX__
 347     group *gr;
 348     if ((gr = getgrgid(getgid())) != NULL)
 349         return wxString(gr->gr_name, wxConvLibc);
 350 #endif
 351     return _("unknown");
 352 }
 353
 354 static inline int UserId()
 355 {
 356 #ifdef __UNIX__
 357     return getuid();
 358 #else
 359     return 0;
 360 #endif
 361 }
 362
 363 static inline int GroupId()
 364 {
 365 #ifdef __UNIX__
 366     return getgid();
 367 #else
 368     return 0;
 369 #endif
 370 }
 371
 372 // ignore the size field for entry types 3, 4, 5 and 6
 373 //
 374 static inline wxFileOffset GetDataSize(const wxTarEntry& entry)
 375 {
 376     switch (entry.GetTypeFlag()) {
 377         case wxTAR_CHRTYPE:
 378         case wxTAR_BLKTYPE:
 379         case wxTAR_DIRTYPE:
 380         case wxTAR_FIFOTYPE:
 381             return 0;
 382         default:
 383             return entry.GetSize();
 384     }
 385 }
 386
 387
 388 /////////////////////////////////////////////////////////////////////////////
 389 // Tar Entry
 390 // Holds all the meta-data for a file in the tar
 391
 392 wxTarEntry::wxTarEntry(const wxString& name /*=wxEmptyString*/,
 393                        const wxDateTime& dt /*=wxDateTime::Now()*/,
 394                        wxFileOffset size    /*=0*/)
 395   : m_Mode(0644),
 396     m_IsModeSet(false),
 397     m_UserId(UserId()),
 398     m_GroupId(GroupId()),
 399     m_Size(size),
 400     m_Offset(wxInvalidOffset),
 401     m_ModifyTime(dt),
 402     m_TypeFlag(wxTAR_REGTYPE),
 403     m_UserName(wxGetUserId()),
 404     m_GroupName(GroupName()),
 405     m_DevMajor(~0),
 406     m_DevMinor(~0)
 407 {
 408     if (!name.empty())
 409         SetName(name);
 410 }
 411
 412 wxTarEntry::~wxTarEntry()
 413 {
 414 }
 415
 416 wxTarEntry::wxTarEntry(const wxTarEntry& e)
 417   : wxArchiveEntry(),
 418     m_Name(e.m_Name),
 419     m_Mode(e.m_Mode),
 420     m_IsModeSet(e.m_IsModeSet),
 421     m_UserId(e.m_UserId),
 422     m_GroupId(e.m_GroupId),
 423     m_Size(e.m_Size),
 424     m_Offset(e.m_Offset),
 425     m_ModifyTime(e.m_ModifyTime),
 426     m_AccessTime(e.m_AccessTime),
 427     m_CreateTime(e.m_CreateTime),
 428     m_TypeFlag(e.m_TypeFlag),
 429     m_LinkName(e.m_LinkName),
 430     m_UserName(e.m_UserName),
 431     m_GroupName(e.m_GroupName),
 432     m_DevMajor(e.m_DevMajor),
 433     m_DevMinor(e.m_DevMinor)
 434 {
 435 }
 436
 437 wxTarEntry& wxTarEntry::operator=(const wxTarEntry& e)
 438 {
 439     if (&e != this) {
 440         m_Name = e.m_Name;
 441         m_Mode = e.m_Mode;
 442         m_IsModeSet = e.m_IsModeSet;
 443         m_UserId = e.m_UserId;
 444         m_GroupId = e.m_GroupId;
 445         m_Size = e.m_Size;
 446         m_Offset = e.m_Offset;
 447         m_ModifyTime = e.m_ModifyTime;
 448         m_AccessTime = e.m_AccessTime;
 449         m_CreateTime = e.m_CreateTime;
 450         m_TypeFlag = e.m_TypeFlag;
 451         m_LinkName = e.m_LinkName;
 452         m_UserName = e.m_UserName;
 453         m_GroupName = e.m_GroupName;
 454         m_DevMajor = e.m_DevMajor;
 455         m_DevMinor = e.m_DevMinor;
 456     }
 457     return *this;
 458 }
 459
 460 wxString wxTarEntry::GetName(wxPathFormat format /*=wxPATH_NATIVE*/) const
 461 {
 462     bool isDir = IsDir() && !m_Name.empty();
 463
 464     // optimisations for common (and easy) cases
 465     switch (wxFileName::GetFormat(format)) {
 466         case wxPATH_DOS:
 467         {
 468             wxString name(isDir ? m_Name + _T("\\") : m_Name);
 469             for (size_t i = 0; i < name.length(); i++)
 470                 if (name[i] == _T('/'))
 471                     name[i] = _T('\\');
 472             return name;
 473         }
 474
 475         case wxPATH_UNIX:
 476             return isDir ? m_Name + _T("/") : m_Name;
 477
 478         default:
 479             ;
 480     }
 481
 482     wxFileName fn;
 483
 484     if (isDir)
 485         fn.AssignDir(m_Name, wxPATH_UNIX);
 486     else
 487         fn.Assign(m_Name, wxPATH_UNIX);
 488
 489     return fn.GetFullPath(format);
 490 }
 491
 492 void wxTarEntry::SetName(const wxString& name, wxPathFormat format)
 493 {
 494     bool isDir;
 495     m_Name = GetInternalName(name, format, &isDir);
 496     SetIsDir(isDir);
 497 }
 498
 499 // Static - Internally tars and zips use forward slashes for the path
 500 // separator, absolute paths aren't allowed, and directory names have a
 501 // trailing slash.  This function converts a path into this internal format,
 502 // but without a trailing slash for a directory.
 503 //
 504 wxString wxTarEntry::GetInternalName(const wxString& name,
 505                                      wxPathFormat format /*=wxPATH_NATIVE*/,
 506                                      bool *pIsDir        /*=NULL*/)
 507 {
 508     wxString internal;
 509
 510     if (wxFileName::GetFormat(format) != wxPATH_UNIX)
 511         internal = wxFileName(name, format).GetFullPath(wxPATH_UNIX);
 512     else
 513         internal = name;
 514
 515     bool isDir = !internal.empty() && internal.Last() == '/';
 516     if (pIsDir)
 517         *pIsDir = isDir;
 518     if (isDir)
 519         internal.erase(internal.length() - 1);
 520
 521     while (!internal.empty() && *internal.begin() == '/')
 522         internal.erase(0, 1);
 523     while (!internal.empty() && internal.compare(0, 2, _T("./")) == 0)
 524         internal.erase(0, 2);
 525     if (internal == _T(".") || internal == _T(".."))
 526         internal = wxEmptyString;
 527
 528     return internal;
 529 }
 530
 531 bool wxTarEntry::IsDir() const
 532 {
 533     return m_TypeFlag == wxTAR_DIRTYPE;
 534 }
 535
 536 void wxTarEntry::SetIsDir(bool isDir)
 537 {
 538     if (isDir)
 539         m_TypeFlag = wxTAR_DIRTYPE;
 540     else if (m_TypeFlag == wxTAR_DIRTYPE)
 541         m_TypeFlag = wxTAR_REGTYPE;
 542 }
 543
 544 void wxTarEntry::SetIsReadOnly(bool isReadOnly)
 545 {
 546     if (isReadOnly)
 547         m_Mode &= ~0222;
 548     else
 549         m_Mode |= 0200;
 550 }
 551
 552 int wxTarEntry::GetMode() const
 553 {
 554     if (m_IsModeSet || !IsDir())
 555         return m_Mode;
 556     else
 557         return m_Mode | 0111;
 558
 559 }
 560
 561 void wxTarEntry::SetMode(int mode)
 562 {
 563     m_Mode = mode & 07777;
 564     m_IsModeSet = true;
 565 }
 566
 567
 568 /////////////////////////////////////////////////////////////////////////////
 569 // Input stream
 570
 571 wxDECLARE_SCOPED_PTR(wxTarEntry, wxTarEntryPtr_)
 572 wxDEFINE_SCOPED_PTR (wxTarEntry, wxTarEntryPtr_)
 573
 574 wxTarInputStream::wxTarInputStream(wxInputStream& stream,
 575                                    wxMBConv& conv /*=wxConvLocal*/)
 576  :  wxArchiveInputStream(stream, conv)
 577 {
 578     Init();
 579 }
 580
 581 wxTarInputStream::wxTarInputStream(wxInputStream *stream,
 582                                    wxMBConv& conv /*=wxConvLocal*/)
 583  :  wxArchiveInputStream(stream, conv)
 584 {
 585     Init();
 586 }
 587
 588 void wxTarInputStream::Init()
 589 {
 590     m_pos = wxInvalidOffset;
 591     m_offset = 0;
 592     m_size = wxInvalidOffset;
 593     m_sumType = SUM_UNKNOWN;
 594     m_tarType = TYPE_USTAR;
 595     m_hdr = new wxTarHeaderBlock;
 596     m_HeaderRecs = NULL;
 597     m_GlobalHeaderRecs = NULL;
 598     m_lasterror = m_parent_i_stream->GetLastError();
 599 }
 600
 601 wxTarInputStream::~wxTarInputStream()
 602 {
 603     delete m_hdr;
 604     delete m_HeaderRecs;
 605     delete m_GlobalHeaderRecs;
 606 }
 607
 608 wxTarEntry *wxTarInputStream::GetNextEntry()
 609 {
 610     m_lasterror = ReadHeaders();
 611
 612     if (!IsOk())
 613         return NULL;
 614
 615     wxTarEntryPtr_ entry(new wxTarEntry);
 616
 617     entry->SetMode(GetHeaderNumber(TAR_MODE));
 618     entry->SetUserId(GetHeaderNumber(TAR_UID));
 619     entry->SetGroupId(GetHeaderNumber(TAR_UID));
 620     entry->SetSize(GetHeaderNumber(TAR_SIZE));
 621
 622     entry->SetOffset(m_offset);
 623
 624     entry->SetDateTime(GetHeaderDate(_T("mtime")));
 625     entry->SetAccessTime(GetHeaderDate(_T("atime")));
 626     entry->SetCreateTime(GetHeaderDate(_T("ctime")));
 627
 628     entry->SetTypeFlag(*m_hdr->Get(TAR_TYPEFLAG));
 629     bool isDir = entry->IsDir();
 630
 631     entry->SetLinkName(GetHeaderString(TAR_LINKNAME));
 632
 633     if (m_tarType != TYPE_OLDTAR) {
 634         entry->SetUserName(GetHeaderString(TAR_UNAME));
 635         entry->SetGroupName(GetHeaderString(TAR_GNAME));
 636
 637         entry->SetDevMajor(GetHeaderNumber(TAR_DEVMAJOR));
 638         entry->SetDevMinor(GetHeaderNumber(TAR_DEVMINOR));
 639     }
 640
 641     entry->SetName(GetHeaderPath(), wxPATH_UNIX);
 642     if (isDir)
 643         entry->SetIsDir();
 644
 645     if (m_HeaderRecs)
 646         m_HeaderRecs->clear();
 647
 648     m_size = GetDataSize(*entry);
 649     m_pos = 0;
 650
 651     return entry.release();
 652 }
 653
 654 bool wxTarInputStream::OpenEntry(wxTarEntry& entry)
 655 {
 656     wxFileOffset offset = entry.GetOffset();
 657
 658     if (GetLastError() != wxSTREAM_READ_ERROR
 659             && m_parent_i_stream->IsSeekable()
 660             && m_parent_i_stream->SeekI(offset) == offset)
 661     {
 662         m_offset = offset;
 663         m_size = GetDataSize(entry);
 664         m_pos = 0;
 665         m_lasterror = wxSTREAM_NO_ERROR;
 666         return true;
 667     } else {
 668         m_lasterror = wxSTREAM_READ_ERROR;
 669         return false;
 670     }
 671 }
 672
 673 bool wxTarInputStream::OpenEntry(wxArchiveEntry& entry)
 674 {
 675     wxTarEntry *tarEntry = wxStaticCast(&entry, wxTarEntry);
 676     return tarEntry ? OpenEntry(*tarEntry) : false;
 677 }
 678
 679 bool wxTarInputStream::CloseEntry()
 680 {
 681     if (m_lasterror == wxSTREAM_READ_ERROR)
 682         return false;
 683     if (!IsOpened())
 684         return true;
 685
 686     wxFileOffset size = RoundUpSize(m_size);
 687     wxFileOffset remainder = size - m_pos;
 688
 689     if (remainder && m_parent_i_stream->IsSeekable()) {
 690         wxLogNull nolog;
 691         if (m_parent_i_stream->SeekI(remainder, wxFromCurrent)
 692                 != wxInvalidOffset)
 693             remainder = 0;
 694     }
 695
 696     if (remainder) {
 697         const int BUFSIZE = 8192;
 698         wxCharBuffer buf(BUFSIZE);
 699
 700         while (remainder > 0 && m_parent_i_stream->IsOk())
 701             remainder -= m_parent_i_stream->Read(
 702                     buf.data(), wxMin(BUFSIZE, remainder)).LastRead();
 703     }
 704
 705     m_pos = wxInvalidOffset;
 706     m_offset += size;
 707     m_lasterror = m_parent_i_stream->GetLastError();
 708
 709     return IsOk();
 710 }
 711
 712 wxStreamError wxTarInputStream::ReadHeaders()
 713 {
 714     if (!CloseEntry())
 715         return wxSTREAM_READ_ERROR;
 716
 717     bool done = false;
 718
 719     while (!done) {
 720         m_hdr->Read(*m_parent_i_stream);
 721         if (m_parent_i_stream->Eof())
 722             wxLogError(_("incomplete header block in tar"));
 723         if (!*m_parent_i_stream)
 724             return wxSTREAM_READ_ERROR;
 725         m_offset += TAR_BLOCKSIZE;
 726
 727         // an all-zero header marks the end of the tar
 728         if (m_hdr->IsAllZeros())
 729             return wxSTREAM_EOF;
 730
 731         // the checksum is supposed to be the unsigned sum of the header bytes,
 732         // but there have been versions of tar that used the signed sum, so
 733         // accept that too, but only if used throughout.
 734         wxUint32 chksum = m_hdr->GetOctal(TAR_CHKSUM);
 735         bool ok = false;
 736
 737         if (m_sumType != SUM_SIGNED) {
 738             ok = chksum == m_hdr->Sum();
 739             if (m_sumType == SUM_UNKNOWN)
 740                 m_sumType = ok ? SUM_UNSIGNED : SUM_SIGNED;
 741         }
 742         if (m_sumType == SUM_SIGNED)
 743             ok = chksum == m_hdr->Sum(true);
 744         if (!ok) {
 745             wxLogError(_("checksum failure reading tar header block"));
 746             return wxSTREAM_READ_ERROR;
 747         }
 748
 749         if (strcmp(m_hdr->Get(TAR_MAGIC), USTAR_MAGIC) == 0)
 750             m_tarType = TYPE_USTAR;
 751         else if (strcmp(m_hdr->Get(TAR_MAGIC), GNU_MAGIC) == 0 &&
 752                  strcmp(m_hdr->Get(TAR_VERSION), GNU_VERION) == 0)
 753             m_tarType = TYPE_GNUTAR;
 754         else
 755             m_tarType = TYPE_OLDTAR;
 756
 757         if (m_tarType != TYPE_USTAR)
 758             break;
 759
 760         switch (*m_hdr->Get(TAR_TYPEFLAG)) {
 761             case 'g': ReadExtendedHeader(m_GlobalHeaderRecs); break;
 762             case 'x': ReadExtendedHeader(m_HeaderRecs); break;
 763             default:  done = true;
 764         }
 765     }
 766
 767     return wxSTREAM_NO_ERROR;
 768 }
 769
 770 wxString wxTarInputStream::GetExtendedHeader(const wxString& key) const
 771 {
 772     wxTarHeaderRecords::iterator it;
 773
 774     // look at normal extended header records first
 775     if (m_HeaderRecs) {
 776         it = m_HeaderRecs->find(key);
 777         if (it != m_HeaderRecs->end())
 778             return wxString(it->second.wc_str(wxConvUTF8), GetConv());
 779     }
 780
 781     // if not found, look at the global header records
 782     if (m_GlobalHeaderRecs) {
 783         it = m_GlobalHeaderRecs->find(key);
 784         if (it != m_GlobalHeaderRecs->end())
 785             return wxString(it->second.wc_str(wxConvUTF8), GetConv());
 786     }
 787
 788     return wxEmptyString;
 789 }
 790
 791 wxString wxTarInputStream::GetHeaderPath() const
 792 {
 793     wxString path;
 794
 795     if ((path = GetExtendedHeader(_T("path"))) != wxEmptyString)
 796         return path;
 797
 798     path = wxString(m_hdr->Get(TAR_NAME), GetConv());
 799     if (m_tarType != TYPE_USTAR)
 800         return path;
 801
 802     const char *prefix = m_hdr->Get(TAR_PREFIX);
 803     return *prefix ? wxString(prefix, GetConv()) + _T("/") + path : path;
 804 }
 805
 806 wxDateTime wxTarInputStream::GetHeaderDate(const wxString& key) const
 807 {
 808     wxString value;
 809
 810     // try extended header, stored as decimal seconds since the epoch
 811     if ((value = GetExtendedHeader(key)) != wxEmptyString) {
 812         wxLongLong ll;
 813         ll.Assign(wxAtof(value) * 1000.0);
 814         return ll;
 815     }
 816
 817     if (key == _T("mtime"))
 818         return wxLongLong(m_hdr->GetOctal(TAR_MTIME)) * 1000L;
 819
 820     return wxDateTime();
 821 }
 822
 823 wxTarNumber wxTarInputStream::GetHeaderNumber(int id) const
 824 {
 825     wxString value;
 826
 827     if ((value = GetExtendedHeader(m_hdr->Name(id))) != wxEmptyString) {
 828         wxTarNumber n = 0;
 829         const wxChar *p = value;
 830         while (*p == ' ')
 831             p++;
 832         while (isdigit(*p))
 833             n = n * 10 + (*p++ - '0');
 834         return n;
 835     } else {
 836         return m_hdr->GetOctal(id);
 837     }
 838 }
 839
 840 wxString wxTarInputStream::GetHeaderString(int id) const
 841 {
 842     wxString value;
 843
 844     if ((value = GetExtendedHeader(m_hdr->Name(id))) != wxEmptyString)
 845         return value;
 846
 847     return wxString(m_hdr->Get(id), GetConv());
 848 }
 849
 850 // An extended header consists of one or more records, each constructed:
 851 // "%d %s=%s\n", <length>, <keyword>, <value>
 852 // <length> is the byte length, <keyword> and <value> are UTF-8
 853
 854 bool wxTarInputStream::ReadExtendedHeader(wxTarHeaderRecords*& recs)
 855 {
 856     if (!recs)
 857         recs = new wxTarHeaderRecords;
 858
 859     // round length up to a whole number of blocks
 860     size_t len = m_hdr->GetOctal(TAR_SIZE);
 861     size_t size = RoundUpSize(len);
 862
 863     // read in the whole header since it should be small
 864     wxCharBuffer buf(size);
 865     size_t lastread = m_parent_i_stream->Read(buf.data(), size).LastRead();
 866     if (lastread < len)
 867         len = lastread;
 868     buf.data()[len] = 0;
 869     m_offset += lastread;
 870
 871     size_t recPos, recSize;
 872     bool ok = true;
 873
 874     for (recPos = 0; recPos < len; recPos += recSize) {
 875         char *pRec = buf.data() + recPos;
 876         char *p = pRec;
 877
 878         // read the record size (byte count in ascii decimal)
 879         recSize = 0;
 880         while (isdigit(*p))
 881             recSize = recSize * 10 + *p++ - '0';
 882
 883         // validity checks
 884         if (recPos + recSize > len)
 885             break;
 886         if (recSize < p - pRec + (size_t)3 || *p != ' '
 887                 || pRec[recSize - 1] != '\012') {
 888             ok = false;
 889             continue;
 890         }
 891
 892         // replace the final '\n' with a nul, to terminate value
 893         pRec[recSize - 1] = 0;
 894         // the key is here, following the space
 895         char *pKey = ++p;
 896
 897         // look forward for the '=', the value follows
 898         while (*p && *p != '=')
 899             p++;
 900         if (!*p) {
 901             ok = false;
 902             continue;
 903         }
 904         // replace the '=' with a nul, to terminate the key
 905         *p++ = 0;
 906
 907         wxString key(wxConvUTF8.cMB2WC(pKey), GetConv());
 908         wxString value(wxConvUTF8.cMB2WC(p), GetConv());
 909
 910         // an empty value unsets a previously given value
 911         if (value.empty())
 912             recs->erase(key);
 913         else
 914             (*recs)[key] = value;
 915     }
 916
 917     if (!ok || recPos < len || size != lastread) {
 918         wxLogWarning(_("invalid data in extended tar header"));
 919         return false;
 920     }
 921
 922     return true;
 923 }
 924
 925 wxFileOffset wxTarInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
 926 {
 927     if (!IsOpened()) {
 928         wxLogError(_("tar entry not open"));
 929         m_lasterror = wxSTREAM_READ_ERROR;
 930     }
 931     if (!IsOk())
 932         return wxInvalidOffset;
 933
 934     switch (mode) {
 935         case wxFromStart:   break;
 936         case wxFromCurrent: pos += m_pos; break;
 937         case wxFromEnd:     pos += m_size; break;
 938     }
 939
 940     if (pos < 0 || m_parent_i_stream->SeekI(m_offset + pos) == wxInvalidOffset)
 941         return wxInvalidOffset;
 942
 943     m_pos = pos;
 944     return m_pos;
 945 }
 946
 947 size_t wxTarInputStream::OnSysRead(void *buffer, size_t size)
 948 {
 949     if (!IsOpened()) {
 950         wxLogError(_("tar entry not open"));
 951         m_lasterror = wxSTREAM_READ_ERROR;
 952     }
 953     if (!IsOk() || !size)
 954         return 0;
 955
 956     if (m_pos >= m_size)
 957         size = 0;
 958     else if (m_pos + size > m_size + (size_t)0)
 959         size = m_size - m_pos;
 960
 961     size_t lastread = m_parent_i_stream->Read(buffer, size).LastRead();
 962     m_pos += lastread;
 963
 964     if (m_pos >= m_size) {
 965         m_lasterror = wxSTREAM_EOF;
 966     } else if (!m_parent_i_stream->IsOk()) {
 967         // any other error will have been reported by the underlying stream
 968         if (m_parent_i_stream->Eof())
 969             wxLogError(_("unexpected end of file"));
 970         m_lasterror = wxSTREAM_READ_ERROR;
 971     }
 972
 973     return lastread;
 974 }
 975
 976
 977 /////////////////////////////////////////////////////////////////////////////
 978 // Output stream
 979
 980 wxTarOutputStream::wxTarOutputStream(wxOutputStream& stream,
 981                                      wxTarFormat format /*=wxTAR_PAX*/,
 982                                      wxMBConv& conv     /*=wxConvLocal*/)
 983  :  wxArchiveOutputStream(stream, conv)
 984 {
 985     Init(format);
 986 }
 987
 988 wxTarOutputStream::wxTarOutputStream(wxOutputStream *stream,
 989                                      wxTarFormat format /*=wxTAR_PAX*/,
 990                                      wxMBConv& conv     /*=wxConvLocal*/)
 991  :  wxArchiveOutputStream(stream, conv)
 992 {
 993     Init(format);
 994 }
 995
 996 void wxTarOutputStream::Init(wxTarFormat format)
 997 {
 998     m_pos = wxInvalidOffset;
 999     m_maxpos = wxInvalidOffset;
1000     m_size = wxInvalidOffset;
1001     m_headpos = wxInvalidOffset;
1002     m_datapos = wxInvalidOffset;
1003     m_tarstart = wxInvalidOffset;
1004     m_tarsize = 0;
1005     m_pax = format == wxTAR_PAX;
1006     m_BlockingFactor = m_pax ? 10 : 20;
1007     m_chksum = 0;
1008     m_large = false;
1009     m_hdr = new wxTarHeaderBlock;
1010     m_hdr2 = NULL;
1011     m_extendedHdr = NULL;
1012     m_extendedSize = 0;
1013     m_lasterror = m_parent_o_stream->GetLastError();
1014 }
1015
1016 wxTarOutputStream::~wxTarOutputStream()
1017 {
1018     if (m_tarsize)
1019         Close();
1020     delete m_hdr;
1021     delete m_hdr2;
1022     delete [] m_extendedHdr;
1023 }
1024
1025 bool wxTarOutputStream::PutNextEntry(wxTarEntry *entry)
1026 {
1027     wxTarEntryPtr_ e(entry);
1028
1029     if (!CloseEntry())
1030         return false;
1031
1032     if (!m_tarsize) {
1033         wxLogNull nolog;
1034         m_tarstart = m_parent_o_stream->TellO();
1035     }
1036
1037     if (m_tarstart != wxInvalidOffset)
1038         m_headpos = m_tarstart + m_tarsize;
1039
1040     if (WriteHeaders(*e)) {
1041         m_pos = 0;
1042         m_maxpos = 0;
1043         m_size = GetDataSize(*e);
1044         if (m_tarstart != wxInvalidOffset)
1045             m_datapos = m_tarstart + m_tarsize;
1046
1047         // types that are not allowd any data
1048         const char nodata[] = {
1049             wxTAR_LNKTYPE, wxTAR_SYMTYPE, wxTAR_CHRTYPE, wxTAR_BLKTYPE,
1050             wxTAR_DIRTYPE, wxTAR_FIFOTYPE, 0
1051         };
1052         int typeflag = e->GetTypeFlag();
1053
1054         // pax does now allow data for wxTAR_LNKTYPE
1055         if (!m_pax || typeflag != wxTAR_LNKTYPE)
1056             if (strchr(nodata, typeflag) != NULL)
1057                 CloseEntry();
1058     }
1059
1060     return IsOk();
1061 }
1062
1063 bool wxTarOutputStream::PutNextEntry(const wxString& name,
1064                                      const wxDateTime& dt,
1065                                      wxFileOffset size)
1066 {
1067     return PutNextEntry(new wxTarEntry(name, dt, size));
1068 }
1069
1070 bool wxTarOutputStream::PutNextDirEntry(const wxString& name,
1071                                         const wxDateTime& dt)
1072 {
1073     wxTarEntry *entry = new wxTarEntry(name, dt);
1074     entry->SetIsDir();
1075     return PutNextEntry(entry);
1076 }
1077
1078 bool wxTarOutputStream::PutNextEntry(wxArchiveEntry *entry)
1079 {
1080     wxTarEntry *tarEntry = wxStaticCast(entry, wxTarEntry);
1081     if (!tarEntry)
1082         delete entry;
1083     return PutNextEntry(tarEntry);
1084 }
1085
1086 bool wxTarOutputStream::CopyEntry(wxTarEntry *entry,
1087                                   wxTarInputStream& inputStream)
1088 {
1089     if (PutNextEntry(entry))
1090         Write(inputStream);
1091     return IsOk() && inputStream.Eof();
1092 }
1093
1094 bool wxTarOutputStream::CopyEntry(wxArchiveEntry *entry,
1095                                   wxArchiveInputStream& inputStream)
1096 {
1097     if (PutNextEntry(entry))
1098         Write(inputStream);
1099     return IsOk() && inputStream.Eof();
1100 }
1101
1102 bool wxTarOutputStream::CloseEntry()
1103 {
1104     if (!IsOpened())
1105         return true;
1106
1107     if (m_pos < m_maxpos) {
1108         wxASSERT(m_parent_o_stream->IsSeekable());
1109         m_parent_o_stream->SeekO(m_datapos + m_maxpos);
1110         m_lasterror = m_parent_o_stream->GetLastError();
1111         m_pos = m_maxpos;
1112     }
1113
1114     if (IsOk()) {
1115         wxFileOffset size = RoundUpSize(m_pos);
1116         if (size > m_pos) {
1117             memset(m_hdr, 0, size - m_pos);
1118             m_parent_o_stream->Write(m_hdr, size - m_pos);
1119             m_lasterror = m_parent_o_stream->GetLastError();
1120         }
1121         m_tarsize += size;
1122     }
1123
1124     if (IsOk() && m_pos != m_size)
1125         ModifyHeader();
1126
1127     m_pos = wxInvalidOffset;
1128     m_maxpos = wxInvalidOffset;
1129     m_size = wxInvalidOffset;
1130     m_headpos = wxInvalidOffset;
1131     m_datapos = wxInvalidOffset;
1132
1133     return IsOk();
1134 }
1135
1136 bool wxTarOutputStream::Close()
1137 {
1138     if (!CloseEntry())
1139         return false;
1140
1141     memset(m_hdr, 0, sizeof(*m_hdr));
1142     int count = (RoundUpSize(m_tarsize + 2 * TAR_BLOCKSIZE, m_BlockingFactor)
1143                     - m_tarsize) / TAR_BLOCKSIZE;
1144     while (count--)
1145         m_parent_o_stream->Write(m_hdr, TAR_BLOCKSIZE);
1146
1147     m_tarsize = 0;
1148     m_tarstart = wxInvalidOffset;
1149     m_lasterror = m_parent_o_stream->GetLastError();
1150     return IsOk();
1151 }
1152
1153 bool wxTarOutputStream::WriteHeaders(wxTarEntry& entry)
1154 {
1155     memset(m_hdr, 0, sizeof(*m_hdr));
1156
1157     SetHeaderPath(entry.GetName(wxPATH_UNIX));
1158
1159     SetHeaderNumber(TAR_MODE, entry.GetMode());
1160     SetHeaderNumber(TAR_UID, entry.GetUserId());
1161     SetHeaderNumber(TAR_GID, entry.GetGroupId());
1162
1163     if (entry.GetSize() == wxInvalidOffset)
1164         entry.SetSize(0);
1165     m_large = !SetHeaderNumber(TAR_SIZE, entry.GetSize());
1166
1167     SetHeaderDate(_T("mtime"), entry.GetDateTime());
1168     if (entry.GetAccessTime().IsValid())
1169         SetHeaderDate(_T("atime"), entry.GetAccessTime());
1170     if (entry.GetCreateTime().IsValid())
1171         SetHeaderDate(_T("ctime"), entry.GetCreateTime());
1172
1173     *m_hdr->Get(TAR_TYPEFLAG) = char(entry.GetTypeFlag());
1174
1175     strcpy(m_hdr->Get(TAR_MAGIC), USTAR_MAGIC);
1176     strcpy(m_hdr->Get(TAR_VERSION), USTAR_VERSION);
1177
1178     SetHeaderString(TAR_LINKNAME, entry.GetLinkName());
1179     SetHeaderString(TAR_UNAME, entry.GetUserName());
1180     SetHeaderString(TAR_GNAME, entry.GetGroupName());
1181
1182     if (~entry.GetDevMajor())
1183         SetHeaderNumber(TAR_DEVMAJOR, entry.GetDevMajor());
1184     if (~entry.GetDevMinor())
1185         SetHeaderNumber(TAR_DEVMINOR, entry.GetDevMinor());
1186
1187     m_chksum = m_hdr->Sum();
1188     m_hdr->SetOctal(TAR_CHKSUM, m_chksum);
1189     if (!m_large)
1190         m_chksum -= m_hdr->SumField(TAR_SIZE);
1191
1192     // The main header is now fully prepared so we know what extended headers
1193     // (if any) will be needed. Output any extended headers before writing
1194     // the main header.
1195     if (m_extendedHdr && *m_extendedHdr) {
1196         wxASSERT(m_pax);
1197         // the extended headers are written to the tar as a file entry,
1198         // so prepare a regular header block for the pseudo-file.
1199         if (!m_hdr2)
1200             m_hdr2 = new wxTarHeaderBlock;
1201         memset(m_hdr2, 0, sizeof(*m_hdr2));
1202
1203         // an old tar that doesn't understand extended headers will
1204         // extract it as a file, so give these fields reasonable values
1205         // so that the user will have access to read and remove it.
1206         m_hdr2->SetPath(PaxHeaderPath(_T("%d/PaxHeaders.%p/%f"),
1207                                       entry.GetName(wxPATH_UNIX)), GetConv());
1208         m_hdr2->SetOctal(TAR_MODE, 0600);
1209         strcpy(m_hdr2->Get(TAR_UID), m_hdr->Get(TAR_UID));
1210         strcpy(m_hdr2->Get(TAR_GID), m_hdr->Get(TAR_GID));
1211         size_t length = strlen(m_extendedHdr);
1212         m_hdr2->SetOctal(TAR_SIZE, length);
1213         strcpy(m_hdr2->Get(TAR_MTIME), m_hdr->Get(TAR_MTIME));
1214         *m_hdr2->Get(TAR_TYPEFLAG) = 'x';
1215         strcpy(m_hdr2->Get(TAR_MAGIC), USTAR_MAGIC);
1216         strcpy(m_hdr2->Get(TAR_VERSION), USTAR_VERSION);
1217         strcpy(m_hdr2->Get(TAR_UNAME), m_hdr->Get(TAR_UNAME));
1218         strcpy(m_hdr2->Get(TAR_GNAME), m_hdr->Get(TAR_GNAME));
1219
1220         m_hdr2->SetOctal(TAR_CHKSUM, m_hdr2->Sum());
1221
1222         m_hdr2->Write(*m_parent_o_stream);
1223         m_tarsize += TAR_BLOCKSIZE;
1224
1225         size_t rounded = RoundUpSize(length);
1226         memset(m_extendedHdr + length, 0, rounded - length);
1227         m_parent_o_stream->Write(m_extendedHdr, rounded);
1228         m_tarsize += rounded;
1229
1230         *m_extendedHdr = 0;
1231     }
1232
1233     // if don't have extended headers just report error
1234     if (!m_badfit.empty()) {
1235         wxASSERT(!m_pax);
1236         wxLogWarning(_("%s did not fit the tar header for entry '%s'"),
1237                      m_badfit.c_str(), entry.GetName().c_str());
1238         m_badfit.clear();
1239     }
1240
1241     m_hdr->Write(*m_parent_o_stream);
1242     m_tarsize += TAR_BLOCKSIZE;
1243     m_lasterror = m_parent_o_stream->GetLastError();
1244
1245     return IsOk();
1246 }
1247
1248 wxString wxTarOutputStream::PaxHeaderPath(const wxString& format,
1249                                           const wxString& path)
1250 {
1251     wxString d = path.BeforeLast(_T('/'));
1252     wxString f = path.AfterLast(_T('/'));
1253     wxString ret;
1254
1255     if (d.empty())
1256         d = _T(".");
1257
1258     ret.reserve(format.length() + path.length() + 16);
1259
1260     size_t begin = 0;
1261     size_t end;
1262
1263     for (;;) {
1264         end = format.find('%', begin);
1265         if (end == wxString::npos || end + 1 >= format.length())
1266             break;
1267         ret << format.substr(begin, end - begin);
1268         switch (format[end + 1]) {
1269             case 'd': ret << d; break;
1270             case 'f': ret << f; break;
1271             case 'p': ret << wxGetProcessId(); break;
1272             case '%': ret << _T("%"); break;
1273         }
1274         begin = end + 2;
1275     }
1276
1277     ret << format.substr(begin);
1278
1279     return ret;
1280 }
1281
1282 bool wxTarOutputStream::ModifyHeader()
1283 {
1284     wxFileOffset originalPos = wxInvalidOffset;
1285     wxFileOffset sizePos = wxInvalidOffset;
1286
1287     if (!m_large && m_headpos != wxInvalidOffset
1288             && m_parent_o_stream->IsSeekable())
1289     {
1290         wxLogNull nolog;
1291         originalPos = m_parent_o_stream->TellO();
1292         if (originalPos != wxInvalidOffset)
1293             sizePos =
1294                 m_parent_o_stream->SeekO(m_headpos + m_hdr->Offset(TAR_SIZE));
1295     }
1296
1297     if (sizePos == wxInvalidOffset || !m_hdr->SetOctal(TAR_SIZE, m_pos)) {
1298         wxLogError(_("incorrect size given for tar entry"));
1299         m_lasterror = wxSTREAM_WRITE_ERROR;
1300         return false;
1301     }
1302
1303     m_chksum += m_hdr->SumField(TAR_SIZE);
1304     m_hdr->SetOctal(TAR_CHKSUM, m_chksum);
1305     wxFileOffset sumPos = m_headpos + m_hdr->Offset(TAR_CHKSUM);
1306
1307     return
1308         m_hdr->WriteField(*m_parent_o_stream, TAR_SIZE) &&
1309         m_parent_o_stream->SeekO(sumPos) == sumPos &&
1310         m_hdr->WriteField(*m_parent_o_stream, TAR_CHKSUM) &&
1311         m_parent_o_stream->SeekO(originalPos) == originalPos;
1312 }
1313
1314 void wxTarOutputStream::SetHeaderPath(const wxString& name)
1315 {
1316     if (!m_hdr->SetPath(name, GetConv()) || (m_pax && !name.IsAscii()))
1317         SetExtendedHeader(_T("path"), name);
1318 }
1319
1320 bool wxTarOutputStream::SetHeaderNumber(int id, wxTarNumber n)
1321 {
1322     if (m_hdr->SetOctal(id, n)) {
1323         return true;
1324     } else {
1325         SetExtendedHeader(m_hdr->Name(id), wxLongLong(n).ToString());
1326         return false;
1327     }
1328 }
1329
1330 void wxTarOutputStream::SetHeaderString(int id, const wxString& str)
1331 {
1332     strncpy(m_hdr->Get(id), str.mb_str(GetConv()), m_hdr->Len(id));
1333     if (str.length() > m_hdr->Len(id))
1334         SetExtendedHeader(m_hdr->Name(id), str);
1335 }
1336
1337 void wxTarOutputStream::SetHeaderDate(const wxString& key,
1338                                       const wxDateTime& datetime)
1339 {
1340     wxLongLong ll = datetime.IsValid() ? datetime.GetValue() : wxLongLong(0);
1341     wxLongLong secs = ll / 1000L;
1342
1343     if (key != _T("mtime")
1344         || !m_hdr->SetOctal(TAR_MTIME, wxTarNumber(secs.GetValue()))
1345         || secs <= 0 || secs >= 0x7fffffff)
1346     {
1347         wxString str;
1348         if (ll >= LONG_MIN && ll <= LONG_MAX) {
1349             str.Printf(_T("%g"), ll.ToLong() / 1000.0);
1350         } else {
1351             str = ll.ToString();
1352             str.insert(str.end() - 3, '.');
1353         }
1354         SetExtendedHeader(key, str);
1355     }
1356 }
1357
1358 void wxTarOutputStream::SetExtendedHeader(const wxString& key,
1359                                           const wxString& value)
1360 {
1361     if (m_pax) {
1362         const wxWX2WCbuf wide_key = key.wc_str(GetConv());
1363         const wxCharBuffer utf_key = wxConvUTF8.cWC2MB(wide_key);
1364
1365         const wxWX2WCbuf wide_value = value.wc_str(GetConv());
1366         const wxCharBuffer utf_value = wxConvUTF8.cWC2MB(wide_value);
1367
1368         // a small buffer to format the length field in
1369         char buf[32];
1370         // length of "99<space><key>=<value>\n"
1371         unsigned long length = strlen(utf_value) + strlen(utf_key) + 5;
1372         sprintf(buf, "%lu", length);
1373         // the length includes itself
1374         size_t lenlen = strlen(buf);
1375         if (lenlen != 2) {
1376             length += lenlen - 2;
1377             sprintf(buf, "%lu", length);
1378             if (strlen(buf) > lenlen)
1379                 sprintf(buf, "%lu", ++length);
1380         }
1381
1382         // reallocate m_extendedHdr if it's not big enough
1383         if (m_extendedSize < length) {
1384             size_t rounded = RoundUpSize(length);
1385             m_extendedSize <<= 1;
1386             if (rounded > m_extendedSize)
1387                 m_extendedSize = rounded;
1388             char *oldHdr = m_extendedHdr;
1389             m_extendedHdr = new char[m_extendedSize];
1390             if (oldHdr) {
1391                 strcpy(m_extendedHdr, oldHdr);
1392                 delete oldHdr;
1393             } else {
1394                 *m_extendedHdr = 0;
1395             }
1396         }
1397
1398         // append the new record
1399         char *append = strchr(m_extendedHdr, 0);
1400         sprintf(append, "%s %s=%s\012", buf,
1401                 (const char*)utf_key, (const char*)utf_value);
1402     }
1403     else {
1404         // if not pax then make a list of fields to report as errors
1405         if (!m_badfit.empty())
1406             m_badfit += _T(", ");
1407         m_badfit += key;
1408     }
1409 }
1410
1411 void wxTarOutputStream::Sync()
1412 {
1413     m_parent_o_stream->Sync();
1414 }
1415
1416 wxFileOffset wxTarOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
1417 {
1418     if (!IsOpened()) {
1419         wxLogError(_("tar entry not open"));
1420         m_lasterror = wxSTREAM_WRITE_ERROR;
1421     }
1422     if (!IsOk() || m_datapos == wxInvalidOffset)
1423         return wxInvalidOffset;
1424
1425     switch (mode) {
1426         case wxFromStart:   break;
1427         case wxFromCurrent: pos += m_pos; break;
1428         case wxFromEnd:     pos += m_maxpos; break;
1429     }
1430
1431     if (pos < 0 || m_parent_o_stream->SeekO(m_datapos + pos) == wxInvalidOffset)
1432         return wxInvalidOffset;
1433
1434     m_pos = pos;
1435     return m_pos;
1436 }
1437
1438 size_t wxTarOutputStream::OnSysWrite(const void *buffer, size_t size)
1439 {
1440     if (!IsOpened()) {
1441         wxLogError(_("tar entry not open"));
1442         m_lasterror = wxSTREAM_WRITE_ERROR;
1443     }
1444     if (!IsOk() || !size)
1445         return 0;
1446
1447     size_t lastwrite = m_parent_o_stream->Write(buffer, size).LastWrite();
1448     m_pos += lastwrite;
1449     if (m_pos > m_maxpos)
1450         m_maxpos = m_pos;
1451
1452     if (lastwrite != size)
1453         m_lasterror = wxSTREAM_WRITE_ERROR;
1454
1455     return lastwrite;
1456 }
1457
1458 #endif // wxUSE_TARSTREAM