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_FILEEXTENSION:    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 = '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   : m_Name(e.m_Name),
 418     m_Mode(e.m_Mode),
 419     m_IsModeSet(e.m_IsModeSet),
 420     m_UserId(e.m_UserId),
 421     m_GroupId(e.m_GroupId),
 422     m_Size(e.m_Size),
 423     m_Offset(e.m_Offset),
 424     m_ModifyTime(e.m_ModifyTime),
 425     m_AccessTime(e.m_AccessTime),
 426     m_CreateTime(e.m_CreateTime),
 427     m_TypeFlag(e.m_TypeFlag),
 428     m_LinkName(e.m_LinkName),
 429     m_UserName(e.m_UserName),
 430     m_GroupName(e.m_GroupName),
 431     m_DevMajor(e.m_DevMajor),
 432     m_DevMinor(e.m_DevMinor)
 433 {
 434 }
 435
 436 wxTarEntry& wxTarEntry::operator=(const wxTarEntry& e)
 437 {
 438     if (&e != this) {
 439         m_Name = e.m_Name;
 440         m_Mode = e.m_Mode;
 441         m_IsModeSet = e.m_IsModeSet;
 442         m_UserId = e.m_UserId;
 443         m_GroupId = e.m_GroupId;
 444         m_Size = e.m_Size;
 445         m_Offset = e.m_Offset;
 446         m_ModifyTime = e.m_ModifyTime;
 447         m_AccessTime = e.m_AccessTime;
 448         m_CreateTime = e.m_CreateTime;
 449         m_TypeFlag = e.m_TypeFlag;
 450         m_LinkName = e.m_LinkName;
 451         m_UserName = e.m_UserName;
 452         m_GroupName = e.m_GroupName;
 453         m_DevMajor = e.m_DevMajor;
 454         m_DevMinor = e.m_DevMinor;
 455     }
 456     return *this;
 457 }
 458
 459 wxString wxTarEntry::GetName(wxPathFormat format /*=wxPATH_NATIVE*/) const
 460 {
 461     bool isDir = IsDir() && !m_Name.empty();
 462
 463     // optimisations for common (and easy) cases
 464     switch (wxFileName::GetFormat(format)) {
 465         case wxPATH_DOS:
 466         {
 467             wxString name(isDir ? m_Name + _T("\\") : m_Name);
 468             for (size_t i = 0; i < name.length(); i++)
 469                 if (name[i] == _T('/'))
 470                     name[i] = _T('\\');
 471             return name;
 472         }
 473
 474         case wxPATH_UNIX:
 475             return isDir ? m_Name + _T("/") : m_Name;
 476
 477         default:
 478             ;
 479     }
 480
 481     wxFileName fn;
 482
 483     if (isDir)
 484         fn.AssignDir(m_Name, wxPATH_UNIX);
 485     else
 486         fn.Assign(m_Name, wxPATH_UNIX);
 487
 488     return fn.GetFullPath(format);
 489 }
 490
 491 void wxTarEntry::SetName(const wxString& name, wxPathFormat format)
 492 {
 493     bool isDir;
 494     m_Name = GetInternalName(name, format, &isDir);
 495     SetIsDir(isDir);
 496 }
 497
 498 // Static - Internally tars and zips use forward slashes for the path
 499 // separator, absolute paths aren't allowed, and directory names have a
 500 // trailing slash.  This function converts a path into this internal format,
 501 // but without a trailing slash for a directory.
 502 //
 503 wxString wxTarEntry::GetInternalName(const wxString& name,
 504                                      wxPathFormat format /*=wxPATH_NATIVE*/,
 505                                      bool *pIsDir        /*=NULL*/)
 506 {
 507     wxString internal;
 508
 509     if (wxFileName::GetFormat(format) != wxPATH_UNIX)
 510         internal = wxFileName(name, format).GetFullPath(wxPATH_UNIX);
 511     else
 512         internal = name;
 513
 514     bool isDir = !internal.empty() && internal.Last() == '/';
 515     if (pIsDir)
 516         *pIsDir = isDir;
 517     if (isDir)
 518         internal.erase(internal.length() - 1);
 519
 520     while (!internal.empty() && *internal.begin() == '/')
 521         internal.erase(0, 1);
 522     while (!internal.empty() && internal.compare(0, 2, _T("./")) == 0)
 523         internal.erase(0, 2);
 524     if (internal == _T(".") || internal == _T(".."))
 525         internal = wxEmptyString;
 526
 527     return internal;
 528 }
 529
 530 bool wxTarEntry::IsDir() const
 531 {
 532     return m_TypeFlag - wxTAR_DIRTYPE == 0;
 533 }
 534
 535 void wxTarEntry::SetIsDir(bool isDir)
 536 {
 537     if (isDir)
 538         m_TypeFlag = wxTAR_DIRTYPE;
 539     else if (m_TypeFlag - wxTAR_DIRTYPE == 0)
 540         m_TypeFlag = wxTAR_REGTYPE;
 541 }
 542
 543 void wxTarEntry::SetIsReadOnly(bool isReadOnly)
 544 {
 545     if (isReadOnly)
 546         m_Mode &= ~0222;
 547     else
 548         m_Mode |= 0200;
 549 }
 550
 551 int wxTarEntry::GetMode() const
 552 {
 553     if (m_IsModeSet || !IsDir())
 554         return m_Mode;
 555     else
 556         return m_Mode | 0111;
 557
 558 }
 559
 560 void wxTarEntry::SetMode(int mode)
 561 {
 562     m_Mode = mode & 07777;
 563     m_IsModeSet = true;
 564 }
 565
 566
 567 /////////////////////////////////////////////////////////////////////////////
 568 // Input stream
 569
 570 wxDECLARE_SCOPED_PTR(wxTarEntry, wxTarEntryPtr_)
 571 wxDEFINE_SCOPED_PTR (wxTarEntry, wxTarEntryPtr_)
 572
 573 wxTarInputStream::wxTarInputStream(wxInputStream& stream,
 574                                    wxMBConv& conv /*=wxConvLocal*/)
 575  :  wxArchiveInputStream(stream, conv)
 576 {
 577     Init();
 578 }
 579
 580 wxTarInputStream::wxTarInputStream(wxInputStream *stream,
 581                                    wxMBConv& conv /*=wxConvLocal*/)
 582  :  wxArchiveInputStream(stream, conv)
 583 {
 584     Init();
 585 }
 586
 587 void wxTarInputStream::Init()
 588 {
 589     m_pos = wxInvalidOffset;
 590     m_offset = 0;
 591     m_size = wxInvalidOffset;
 592     m_sumType = SUM_UNKNOWN;
 593     m_tarType = TYPE_USTAR;
 594     m_hdr = new wxTarHeaderBlock;
 595     m_HeaderRecs = NULL;
 596     m_GlobalHeaderRecs = NULL;
 597     m_lasterror = m_parent_i_stream->GetLastError();
 598 }
 599
 600 wxTarInputStream::~wxTarInputStream()
 601 {
 602     delete m_hdr;
 603     delete m_HeaderRecs;
 604     delete m_GlobalHeaderRecs;
 605 }
 606
 607 wxTarEntry *wxTarInputStream::GetNextEntry()
 608 {
 609     m_lasterror = ReadHeaders();
 610
 611     if (!IsOk())
 612         return NULL;
 613
 614     wxTarEntryPtr_ entry(new wxTarEntry);
 615
 616     entry->SetMode(GetHeaderNumber(TAR_MODE));
 617     entry->SetUserId(GetHeaderNumber(TAR_UID));
 618     entry->SetGroupId(GetHeaderNumber(TAR_UID));
 619     entry->SetSize(GetHeaderNumber(TAR_SIZE));
 620
 621     entry->SetOffset(m_offset);
 622
 623     entry->SetDateTime(GetHeaderDate(_T("mtime")));
 624     entry->SetAccessTime(GetHeaderDate(_T("atime")));
 625     entry->SetCreateTime(GetHeaderDate(_T("ctime")));
 626
 627     entry->SetTypeFlag(*m_hdr->Get(TAR_TYPEFLAG));
 628     bool isDir = entry->IsDir();
 629
 630     entry->SetLinkName(GetHeaderString(TAR_LINKNAME));
 631
 632     if (m_tarType != TYPE_OLDTAR) {
 633         entry->SetUserName(GetHeaderString(TAR_UNAME));
 634         entry->SetGroupName(GetHeaderString(TAR_GNAME));
 635
 636         entry->SetDevMajor(GetHeaderNumber(TAR_DEVMAJOR));
 637         entry->SetDevMinor(GetHeaderNumber(TAR_DEVMINOR));
 638     }
 639
 640     entry->SetName(GetHeaderPath(), wxPATH_UNIX);
 641     if (isDir)
 642         entry->SetIsDir();
 643
 644     if (m_HeaderRecs)
 645         m_HeaderRecs->clear();
 646
 647     m_size = GetDataSize(*entry);
 648     m_pos = 0;
 649
 650     return entry.release();
 651 }
 652
 653 bool wxTarInputStream::OpenEntry(wxTarEntry& entry)
 654 {
 655     wxFileOffset offset = entry.GetOffset();
 656
 657     if (GetLastError() != wxSTREAM_READ_ERROR
 658             && m_parent_i_stream->IsSeekable()
 659             && m_parent_i_stream->SeekI(offset) == offset)
 660     {
 661         m_offset = offset;
 662         m_size = GetDataSize(entry);
 663         m_pos = 0;
 664         m_lasterror = wxSTREAM_NO_ERROR;
 665         return true;
 666     } else {
 667         m_lasterror = wxSTREAM_READ_ERROR;
 668         return false;
 669     }
 670 }
 671
 672 bool wxTarInputStream::OpenEntry(wxArchiveEntry& entry)
 673 {
 674     wxTarEntry *tarEntry = wxStaticCast(&entry, wxTarEntry);
 675     return tarEntry ? OpenEntry(*tarEntry) : false;
 676 }
 677
 678 bool wxTarInputStream::CloseEntry()
 679 {
 680     if (m_lasterror == wxSTREAM_READ_ERROR)
 681         return false;
 682     if (!IsOpened())
 683         return true;
 684
 685     wxFileOffset size = RoundUpSize(m_size);
 686     wxFileOffset remainder = size - m_pos;
 687
 688     if (remainder && m_parent_i_stream->IsSeekable()) {
 689         wxLogNull nolog;
 690         if (m_parent_i_stream->SeekI(remainder, wxFromCurrent)
 691                 != wxInvalidOffset)
 692             remainder = 0;
 693     }
 694
 695     if (remainder) {
 696         const int BUFSIZE = 8192;
 697         wxCharBuffer buf(BUFSIZE);
 698
 699         while (remainder > 0 && m_parent_i_stream->IsOk())
 700             remainder -= m_parent_i_stream->Read(
 701                     buf.data(), wxMin(BUFSIZE, remainder)).LastRead();
 702     }
 703
 704     m_pos = wxInvalidOffset;
 705     m_offset += size;
 706     m_lasterror = m_parent_i_stream->GetLastError();
 707
 708     return IsOk();
 709 }
 710
 711 wxStreamError wxTarInputStream::ReadHeaders()
 712 {
 713     if (!CloseEntry())
 714         return wxSTREAM_READ_ERROR;
 715
 716     bool done = false;
 717
 718     while (!done) {
 719         m_hdr->Read(*m_parent_i_stream);
 720         if (m_parent_i_stream->Eof())
 721             wxLogError(_("incomplete header block in tar"));
 722         if (!*m_parent_i_stream)
 723             return wxSTREAM_READ_ERROR;
 724         m_offset += TAR_BLOCKSIZE;
 725
 726         // an all-zero header marks the end of the tar
 727         if (m_hdr->IsAllZeros())
 728             return wxSTREAM_EOF;
 729
 730         // the checksum is supposed to be the unsigned sum of the header bytes,
 731         // but there have been versions of tar that used the signed sum, so
 732         // accept that too, but only if used throughout.
 733         wxUint32 chksum = m_hdr->GetOctal(TAR_CHKSUM);
 734         bool ok = false;
 735
 736         if (m_sumType != SUM_SIGNED) {
 737             ok = chksum == m_hdr->Sum();
 738             if (m_sumType == SUM_UNKNOWN)
 739                 m_sumType = ok ? SUM_UNSIGNED : SUM_SIGNED;
 740         }
 741         if (m_sumType == SUM_SIGNED)
 742             ok = chksum == m_hdr->Sum(true);
 743         if (!ok) {
 744             wxLogError(_("checksum failure reading tar header block"));
 745             return wxSTREAM_READ_ERROR;
 746         }
 747
 748         if (strcmp(m_hdr->Get(TAR_MAGIC), USTAR_MAGIC) == 0)
 749             m_tarType = TYPE_USTAR;
 750         else if (strcmp(m_hdr->Get(TAR_MAGIC), GNU_MAGIC) == 0 &&
 751                  strcmp(m_hdr->Get(TAR_VERSION), GNU_VERION) == 0)
 752             m_tarType = TYPE_GNUTAR;
 753         else
 754             m_tarType = TYPE_OLDTAR;
 755
 756         if (m_tarType != TYPE_USTAR)
 757             break;
 758
 759         switch (*m_hdr->Get(TAR_TYPEFLAG)) {
 760             case 'g': ReadExtendedHeader(m_GlobalHeaderRecs); break;
 761             case 'x': ReadExtendedHeader(m_HeaderRecs); break;
 762             default:  done = true;
 763         }
 764     }
 765
 766     return wxSTREAM_NO_ERROR;
 767 }
 768
 769 wxString wxTarInputStream::GetExtendedHeader(const wxString& key) const
 770 {
 771     wxTarHeaderRecords::iterator it;
 772
 773     // look at normal extended header records first
 774     if (m_HeaderRecs) {
 775         it = m_HeaderRecs->find(key);
 776         if (it != m_HeaderRecs->end())
 777             return wxString(it->second.wc_str(wxConvUTF8), GetConv());
 778     }
 779
 780     // if not found, look at the global header records
 781     if (m_GlobalHeaderRecs) {
 782         it = m_GlobalHeaderRecs->find(key);
 783         if (it != m_GlobalHeaderRecs->end())
 784             return wxString(it->second.wc_str(wxConvUTF8), GetConv());
 785     }
 786
 787     return wxEmptyString;
 788 }
 789
 790 wxString wxTarInputStream::GetHeaderPath() const
 791 {
 792     wxString path;
 793
 794     if ((path = GetExtendedHeader(_T("path"))) != wxEmptyString)
 795         return path;
 796
 797     path = wxString(m_hdr->Get(TAR_NAME), GetConv());
 798     if (m_tarType != TYPE_USTAR)
 799         return path;
 800
 801     const char *prefix = m_hdr->Get(TAR_PREFIX);
 802     return *prefix ? wxString(prefix, GetConv()) + _T("/") + path : path;
 803 }
 804
 805 wxDateTime wxTarInputStream::GetHeaderDate(const wxString& key) const
 806 {
 807     wxString value;
 808
 809     // try extended header, stored as decimal seconds since the epoch
 810     if ((value = GetExtendedHeader(key)) != wxEmptyString) {
 811         wxLongLong ll;
 812         ll.Assign(wxAtof(value) * 1000.0);
 813         return ll;
 814     }
 815
 816     if (key == _T("mtime"))
 817         return wxLongLong(m_hdr->GetOctal(TAR_MTIME)) * 1000L;
 818
 819     return wxDateTime();
 820 }
 821
 822 wxTarNumber wxTarInputStream::GetHeaderNumber(int id) const
 823 {
 824     wxString value;
 825
 826     if ((value = GetExtendedHeader(m_hdr->Name(id))) != wxEmptyString) {
 827         wxTarNumber n = 0;
 828         const wxChar *p = value;
 829         while (*p == ' ')
 830             p++;
 831         while (isdigit(*p))
 832             n = n * 10 + (*p++ - '0');
 833         return n;
 834     } else {
 835         return m_hdr->GetOctal(id);
 836     }
 837 }
 838
 839 wxString wxTarInputStream::GetHeaderString(int id) const
 840 {
 841     wxString value;
 842
 843     if ((value = GetExtendedHeader(m_hdr->Name(id))) != wxEmptyString)
 844         return value;
 845
 846     return wxString(m_hdr->Get(id), GetConv());
 847 }
 848
 849 // An extended header consists of one or more records, each constructed:
 850 // "%d %s=%s\n", <length>, <keyword>, <value>
 851 // <length> is the byte length, <keyword> and <value> are UTF-8
 852
 853 bool wxTarInputStream::ReadExtendedHeader(wxTarHeaderRecords*& recs)
 854 {
 855     if (!recs)
 856         recs = new wxTarHeaderRecords;
 857
 858     // round length up to a whole number of blocks
 859     size_t len = m_hdr->GetOctal(TAR_SIZE);
 860     size_t size = RoundUpSize(len);
 861
 862     // read in the whole header since it should be small
 863     wxCharBuffer buf(size);
 864     size_t lastread = m_parent_i_stream->Read(buf.data(), size).LastRead();
 865     if (lastread < len)
 866         len = lastread;
 867     buf.data()[len] = 0;
 868     m_offset += lastread;
 869
 870     size_t recPos, recSize;
 871     bool ok = true;
 872
 873     for (recPos = 0; recPos < len; recPos += recSize) {
 874         char *pRec = buf.data() + recPos;
 875         char *p = pRec;
 876
 877         // read the record size (byte count in ascii decimal)
 878         recSize = 0;
 879         while (isdigit(*p))
 880             recSize = recSize * 10 + *p++ - '0';
 881
 882         // validity checks
 883         if (recPos + recSize > len)
 884             break;
 885         if (recSize < p - pRec + (size_t)3 || *p != ' '
 886                 || pRec[recSize - 1] != '\012') {
 887             ok = false;
 888             continue;
 889         }
 890
 891         // replace the final '\n' with a nul, to terminate value
 892         pRec[recSize - 1] = 0;
 893         // the key is here, following the space
 894         char *pKey = ++p;
 895
 896         // look forward for the '=', the value follows
 897         while (*p && *p != '=')
 898             p++;
 899         if (!*p) {
 900             ok = false;
 901             continue;
 902         }
 903         // replace the '=' with a nul, to terminate the key
 904         *p++ = 0;
 905
 906         wxString key(wxConvUTF8.cMB2WC(pKey), GetConv());
 907         wxString value(wxConvUTF8.cMB2WC(p), GetConv());
 908
 909         // an empty value unsets a previously given value
 910         if (value.empty())
 911             recs->erase(key);
 912         else
 913             (*recs)[key] = value;
 914     }
 915
 916     if (!ok || recPos < len || size != lastread) {
 917         wxLogWarning(_("invalid data in extended tar header"));
 918         return false;
 919     }
 920
 921     return true;
 922 }
 923
 924 wxFileOffset wxTarInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
 925 {
 926     if (!IsOpened()) {
 927         wxLogError(_("tar entry not open"));
 928         m_lasterror = wxSTREAM_READ_ERROR;
 929     }
 930     if (!IsOk())
 931         return wxInvalidOffset;
 932
 933     switch (mode) {
 934         case wxFromStart:   break;
 935         case wxFromCurrent: pos += m_pos; break;
 936         case wxFromEnd:     pos += m_size; break;
 937     }
 938
 939     if (pos < 0 || m_parent_i_stream->SeekI(m_offset + pos) == wxInvalidOffset)
 940         return wxInvalidOffset;
 941
 942     m_pos = pos;
 943     return m_pos;
 944 }
 945
 946 size_t wxTarInputStream::OnSysRead(void *buffer, size_t size)
 947 {
 948     if (!IsOpened()) {
 949         wxLogError(_("tar entry not open"));
 950         m_lasterror = wxSTREAM_READ_ERROR;
 951     }
 952     if (!IsOk() || !size)
 953         return 0;
 954
 955     if (m_pos >= m_size)
 956         size = 0;
 957     else if (m_pos + size > m_size + (size_t)0)
 958         size = m_size - m_pos;
 959
 960     size_t lastread = m_parent_i_stream->Read(buffer, size).LastRead();
 961     m_pos += lastread;
 962
 963     if (m_pos >= m_size) {
 964         m_lasterror = wxSTREAM_EOF;
 965     } else if (!m_parent_i_stream->IsOk()) {
 966         // any other error will have been reported by the underlying stream
 967         if (m_parent_i_stream->Eof())
 968             wxLogError(_("unexpected end of file"));
 969         m_lasterror = wxSTREAM_READ_ERROR;
 970     }
 971
 972     return lastread;
 973 }
 974
 975
 976 /////////////////////////////////////////////////////////////////////////////
 977 // Output stream
 978
 979 wxTarOutputStream::wxTarOutputStream(wxOutputStream& stream,
 980                                      wxTarFormat format /*=wxTAR_PAX*/,
 981                                      wxMBConv& conv     /*=wxConvLocal*/)
 982  :  wxArchiveOutputStream(stream, conv)
 983 {
 984     Init(format);
 985 }
 986
 987 wxTarOutputStream::wxTarOutputStream(wxOutputStream *stream,
 988                                      wxTarFormat format /*=wxTAR_PAX*/,
 989                                      wxMBConv& conv     /*=wxConvLocal*/)
 990  :  wxArchiveOutputStream(stream, conv)
 991 {
 992     Init(format);
 993 }
 994
 995 void wxTarOutputStream::Init(wxTarFormat format)
 996 {
 997     m_pos = wxInvalidOffset;
 998     m_maxpos = wxInvalidOffset;
 999     m_size = wxInvalidOffset;
1000     m_headpos = wxInvalidOffset;
1001     m_datapos = wxInvalidOffset;
1002     m_tarstart = wxInvalidOffset;
1003     m_tarsize = 0;
1004     m_pax = format == wxTAR_PAX;
1005     m_BlockingFactor = m_pax ? 10 : 20;
1006     m_chksum = 0;
1007     m_large = false;
1008     m_hdr = new wxTarHeaderBlock;
1009     m_hdr2 = NULL;
1010     m_extendedHdr = NULL;
1011     m_extendedSize = 0;
1012     m_lasterror = m_parent_o_stream->GetLastError();
1013 }
1014
1015 wxTarOutputStream::~wxTarOutputStream()
1016 {
1017     if (m_tarsize)
1018         Close();
1019     delete m_hdr;
1020     delete m_hdr2;
1021     delete [] m_extendedHdr;
1022 }
1023
1024 bool wxTarOutputStream::PutNextEntry(wxTarEntry *entry)
1025 {
1026     wxTarEntryPtr_ e(entry);
1027
1028     if (!CloseEntry())
1029         return false;
1030
1031     if (!m_tarsize) {
1032         wxLogNull nolog;
1033         m_tarstart = m_parent_o_stream->TellO();
1034     }
1035
1036     if (m_tarstart != wxInvalidOffset)
1037         m_headpos = m_tarstart + m_tarsize;
1038
1039     if (WriteHeaders(*e)) {
1040         m_pos = 0;
1041         m_maxpos = 0;
1042         m_size = GetDataSize(*e);
1043         if (m_tarstart != wxInvalidOffset)
1044             m_datapos = m_tarstart + m_tarsize;
1045
1046         // types that are not allowd any data
1047         const char nodata[] = {
1048             wxTAR_LNKTYPE, wxTAR_SYMTYPE, wxTAR_CHRTYPE, wxTAR_BLKTYPE,
1049             wxTAR_DIRTYPE, wxTAR_FIFOTYPE, 0
1050         };
1051         char typeflag = e->GetTypeFlag();
1052
1053         // pax does now allow data for wxTAR_LNKTYPE
1054         if (!m_pax || typeflag - wxTAR_LNKTYPE != 0)
1055             if (strchr(nodata, typeflag) != NULL)
1056                 CloseEntry();
1057     }
1058
1059     return IsOk();
1060 }
1061
1062 bool wxTarOutputStream::PutNextEntry(const wxString& name,
1063                                      const wxDateTime& dt,
1064                                      wxFileOffset size)
1065 {
1066     return PutNextEntry(new wxTarEntry(name, dt, size));
1067 }
1068
1069 bool wxTarOutputStream::PutNextDirEntry(const wxString& name,
1070                                         const wxDateTime& dt)
1071 {
1072     wxTarEntry *entry = new wxTarEntry(name, dt);
1073     entry->SetIsDir();
1074     return PutNextEntry(entry);
1075 }
1076
1077 bool wxTarOutputStream::PutNextEntry(wxArchiveEntry *entry)
1078 {
1079     wxTarEntry *tarEntry = wxStaticCast(entry, wxTarEntry);
1080     if (!tarEntry)
1081         delete entry;
1082     return PutNextEntry(tarEntry);
1083 }
1084
1085 bool wxTarOutputStream::CopyEntry(wxTarEntry *entry,
1086                                   wxTarInputStream& inputStream)
1087 {
1088     if (PutNextEntry(entry))
1089         Write(inputStream);
1090     return IsOk() && inputStream.Eof();
1091 }
1092
1093 bool wxTarOutputStream::CopyEntry(wxArchiveEntry *entry,
1094                                   wxArchiveInputStream& inputStream)
1095 {
1096     if (PutNextEntry(entry))
1097         Write(inputStream);
1098     return IsOk() && inputStream.Eof();
1099 }
1100
1101 bool wxTarOutputStream::CloseEntry()
1102 {
1103     if (!IsOpened())
1104         return true;
1105
1106     if (m_pos < m_maxpos) {
1107         wxASSERT(m_parent_o_stream->IsSeekable());
1108         m_parent_o_stream->SeekO(m_datapos + m_maxpos);
1109         m_lasterror = m_parent_o_stream->GetLastError();
1110         m_pos = m_maxpos;
1111     }
1112
1113     if (IsOk()) {
1114         wxFileOffset size = RoundUpSize(m_pos);
1115         if (size > m_pos) {
1116             memset(m_hdr, 0, size - m_pos);
1117             m_parent_o_stream->Write(m_hdr, size - m_pos);
1118             m_lasterror = m_parent_o_stream->GetLastError();
1119         }
1120         m_tarsize += size;
1121     }
1122
1123     if (IsOk() && m_pos != m_size)
1124         ModifyHeader();
1125
1126     m_pos = wxInvalidOffset;
1127     m_maxpos = wxInvalidOffset;
1128     m_size = wxInvalidOffset;
1129     m_headpos = wxInvalidOffset;
1130     m_datapos = wxInvalidOffset;
1131
1132     return IsOk();
1133 }
1134
1135 bool wxTarOutputStream::Close()
1136 {
1137     if (!CloseEntry())
1138         return false;
1139
1140     memset(m_hdr, 0, sizeof(*m_hdr));
1141     int count = (RoundUpSize(m_tarsize + 2 * TAR_BLOCKSIZE, m_BlockingFactor)
1142                     - m_tarsize) / TAR_BLOCKSIZE;
1143     while (count--)
1144         m_parent_o_stream->Write(m_hdr, TAR_BLOCKSIZE);
1145
1146     m_tarsize = 0;
1147     m_tarstart = wxInvalidOffset;
1148     m_lasterror = m_parent_o_stream->GetLastError();
1149     return IsOk();
1150 }
1151
1152 bool wxTarOutputStream::WriteHeaders(wxTarEntry& entry)
1153 {
1154     memset(m_hdr, 0, sizeof(*m_hdr));
1155
1156     SetHeaderPath(entry.GetName(wxPATH_UNIX));
1157
1158     SetHeaderNumber(TAR_MODE, entry.GetMode());
1159     SetHeaderNumber(TAR_UID, entry.GetUserId());
1160     SetHeaderNumber(TAR_GID, entry.GetGroupId());
1161
1162     if (entry.GetSize() == wxInvalidOffset)
1163         entry.SetSize(0);
1164     m_large = SetHeaderNumber(TAR_SIZE, entry.GetSize());
1165
1166     SetHeaderDate(_T("mtime"), entry.GetDateTime());
1167     if (entry.GetAccessTime().IsValid())
1168         SetHeaderDate(_T("atime"), entry.GetAccessTime());
1169     if (entry.GetCreateTime().IsValid())
1170         SetHeaderDate(_T("ctime"), entry.GetCreateTime());
1171
1172     *m_hdr->Get(TAR_TYPEFLAG) = entry.GetTypeFlag();
1173
1174     strcpy(m_hdr->Get(TAR_MAGIC), USTAR_MAGIC);
1175     strcpy(m_hdr->Get(TAR_VERSION), USTAR_VERSION);
1176
1177     SetHeaderString(TAR_LINKNAME, entry.GetLinkName());
1178     SetHeaderString(TAR_UNAME, entry.GetUserName());
1179     SetHeaderString(TAR_GNAME, entry.GetGroupName());
1180
1181     if (~entry.GetDevMajor())
1182         SetHeaderNumber(TAR_DEVMAJOR, entry.GetDevMajor());
1183     if (~entry.GetDevMinor())
1184         SetHeaderNumber(TAR_DEVMINOR, entry.GetDevMinor());
1185
1186     m_chksum = m_hdr->Sum();
1187     m_hdr->SetOctal(TAR_CHKSUM, m_chksum);
1188     if (!m_large)
1189         m_chksum -= m_hdr->SumField(TAR_SIZE);
1190
1191     // The main header is now fully prepared so we know what extended headers
1192     // (if any) will be needed. Output any extended headers before writing
1193     // the main header.
1194     if (m_extendedHdr && *m_extendedHdr) {
1195         wxASSERT(m_pax);
1196         // the extended headers are written to the tar as a file entry,
1197         // so prepare a regular header block for the pseudo-file.
1198         if (!m_hdr2)
1199             m_hdr2 = new wxTarHeaderBlock;
1200         memset(m_hdr2, 0, sizeof(*m_hdr2));
1201
1202         // an old tar that doesn't understand extended headers will
1203         // extract it as a file, so give these fields reasonable values
1204         // so that the user will have access to read and remove it.
1205         m_hdr2->SetPath(PaxHeaderPath(_T("%d/PaxHeaders.%p/%f"),
1206                                       entry.GetName(wxPATH_UNIX)), GetConv());
1207         m_hdr2->SetOctal(TAR_MODE, 0600);
1208         strcpy(m_hdr2->Get(TAR_UID), m_hdr->Get(TAR_UID));
1209         strcpy(m_hdr2->Get(TAR_GID), m_hdr->Get(TAR_GID));
1210         size_t length = strlen(m_extendedHdr);
1211         m_hdr2->SetOctal(TAR_SIZE, length);
1212         strcpy(m_hdr2->Get(TAR_MTIME), m_hdr->Get(TAR_MTIME));
1213         *m_hdr2->Get(TAR_TYPEFLAG) = 'x';
1214         strcpy(m_hdr2->Get(TAR_MAGIC), USTAR_MAGIC);
1215         strcpy(m_hdr2->Get(TAR_VERSION), USTAR_VERSION);
1216         strcpy(m_hdr2->Get(TAR_UNAME), m_hdr->Get(TAR_UNAME));
1217         strcpy(m_hdr2->Get(TAR_GNAME), m_hdr->Get(TAR_GNAME));
1218
1219         m_hdr2->SetOctal(TAR_CHKSUM, m_hdr2->Sum());
1220
1221         m_hdr2->Write(*m_parent_o_stream);
1222         m_tarsize += TAR_BLOCKSIZE;
1223
1224         size_t rounded = RoundUpSize(length);
1225         memset(m_extendedHdr + length, 0, rounded - length);
1226         m_parent_o_stream->Write(m_extendedHdr, rounded);
1227         m_tarsize += rounded;
1228
1229         *m_extendedHdr = 0;
1230     }
1231
1232     // if don't have extended headers just report error
1233     if (!m_badfit.empty()) {
1234         wxASSERT(!m_pax);
1235         wxLogWarning(_("%s did not fit the tar header for entry '%s'"),
1236                      m_badfit.c_str(), entry.GetName().c_str());
1237         m_badfit.clear();
1238     }
1239
1240     m_hdr->Write(*m_parent_o_stream);
1241     m_tarsize += TAR_BLOCKSIZE;
1242     m_lasterror = m_parent_o_stream->GetLastError();
1243
1244     return IsOk();
1245 }
1246
1247 wxString wxTarOutputStream::PaxHeaderPath(const wxString& format,
1248                                           const wxString& path)
1249 {
1250     wxString d = path.BeforeLast(_T('/'));
1251     wxString f = path.AfterLast(_T('/'));
1252     wxString ret;
1253
1254     if (d.empty())
1255         d = _T(".");
1256
1257     ret.reserve(format.length() + path.length() + 16);
1258
1259     size_t begin = 0;
1260     size_t end;
1261
1262     for (;;) {
1263         end = format.find('%', begin);
1264         if (end == wxString::npos || end + 1 >= format.length())
1265             break;
1266         ret << format.substr(begin, end - begin);
1267         switch (format[end + 1]) {
1268             case 'd': ret << d; break;
1269             case 'f': ret << f; break;
1270             case 'p': ret << wxGetProcessId(); break;
1271             case '%': ret << _T("%"); break;
1272         }
1273         begin = end + 2;
1274     }
1275
1276     ret << format.substr(begin);
1277
1278     return ret;
1279 }
1280
1281 bool wxTarOutputStream::ModifyHeader()
1282 {
1283     wxFileOffset originalPos = wxInvalidOffset;
1284     wxFileOffset sizePos = wxInvalidOffset;
1285
1286     if (!m_large && m_headpos != wxInvalidOffset
1287             && m_parent_o_stream->IsSeekable())
1288     {
1289         wxLogNull nolog;
1290         originalPos = m_parent_o_stream->TellO();
1291         if (originalPos != wxInvalidOffset)
1292             sizePos =
1293                 m_parent_o_stream->SeekO(m_headpos + m_hdr->Offset(TAR_SIZE));
1294     }
1295
1296     if (sizePos == wxInvalidOffset || !m_hdr->SetOctal(TAR_SIZE, m_pos)) {
1297         wxLogError(_("incorrect size given for tar entry"));
1298         m_lasterror = wxSTREAM_WRITE_ERROR;
1299         return false;
1300     }
1301
1302     m_chksum += m_hdr->SumField(TAR_SIZE);
1303     m_hdr->SetOctal(TAR_CHKSUM, m_chksum);
1304     wxFileOffset sumPos = m_headpos + m_hdr->Offset(TAR_CHKSUM);
1305
1306     return
1307         m_hdr->WriteField(*m_parent_o_stream, TAR_SIZE) &&
1308         m_parent_o_stream->SeekO(sumPos) == sumPos &&
1309         m_hdr->WriteField(*m_parent_o_stream, TAR_CHKSUM) &&
1310         m_parent_o_stream->SeekO(originalPos) == originalPos;
1311 }
1312
1313 void wxTarOutputStream::SetHeaderPath(const wxString& name)
1314 {
1315     if (!m_hdr->SetPath(name, GetConv()) || (m_pax && !name.IsAscii()))
1316         SetExtendedHeader(_T("path"), name);
1317 }
1318
1319 bool wxTarOutputStream::SetHeaderNumber(int id, wxTarNumber n)
1320 {
1321     if (m_hdr->SetOctal(id, n)) {
1322         return true;
1323     } else {
1324         SetExtendedHeader(m_hdr->Name(id), wxLongLong(n).ToString());
1325         return false;
1326     }
1327 }
1328
1329 void wxTarOutputStream::SetHeaderString(int id, const wxString& str)
1330 {
1331     strncpy(m_hdr->Get(id), str.mb_str(GetConv()), m_hdr->Len(id));
1332     if (str.length() > m_hdr->Len(id))
1333         SetExtendedHeader(m_hdr->Name(id), str);
1334 }
1335
1336 void wxTarOutputStream::SetHeaderDate(const wxString& key,
1337                                       const wxDateTime& datetime)
1338 {
1339     wxLongLong ll = datetime.IsValid() ? datetime.GetValue() : wxLongLong(0);
1340     wxLongLong secs = ll / 1000L;
1341
1342     if (key != _T("mtime") || !m_hdr->SetOctal(TAR_MTIME, secs.GetValue())
1343         || secs <= 0 || secs >= 0x7fffffff)
1344     {
1345         wxString str;
1346         if (ll >= LONG_MIN && ll <= LONG_MAX) {
1347             str.Printf(_T("%g"), ll.ToLong() / 1000.0);
1348         } else {
1349             str = ll.ToString();
1350             str.insert(str.end() - 3, '.');
1351         }
1352         SetExtendedHeader(key, str);
1353     }
1354 }
1355
1356 void wxTarOutputStream::SetExtendedHeader(const wxString& key,
1357                                           const wxString& value)
1358 {
1359     if (m_pax) {
1360         const wxWX2WCbuf wide_key = key.wc_str(GetConv());
1361         const wxCharBuffer utf_key = wxConvUTF8.cWC2MB(wide_key);
1362
1363         const wxWX2WCbuf wide_value = value.wc_str(GetConv());
1364         const wxCharBuffer utf_value = wxConvUTF8.cWC2MB(wide_value);
1365
1366         // a small buffer to format the length field in
1367         char buf[32];
1368         // length of "99<space><key>=<value>\n"
1369         unsigned long length = strlen(utf_value) + strlen(utf_key) + 5;
1370         sprintf(buf, "%lu", length);
1371         // the length includes itself
1372         size_t lenlen = strlen(buf);
1373         if (lenlen != 2) {
1374             length += lenlen - 2;
1375             sprintf(buf, "%lu", length);
1376             if (strlen(buf) > lenlen)
1377                 sprintf(buf, "%lu", ++length);
1378         }
1379
1380         // reallocate m_extendedHdr if it's not big enough
1381         if (m_extendedSize < length) {
1382             size_t rounded = RoundUpSize(length);
1383             m_extendedSize <<= 1;
1384             if (rounded > m_extendedSize)
1385                 m_extendedSize = rounded;
1386             char *oldHdr = m_extendedHdr;
1387             m_extendedHdr = new char[m_extendedSize];
1388             if (oldHdr) {
1389                 strcpy(m_extendedHdr, oldHdr);
1390                 delete oldHdr;
1391             } else {
1392                 *m_extendedHdr = 0;
1393             }
1394         }
1395
1396         // append the new record
1397         char *append = strchr(m_extendedHdr, 0);
1398         sprintf(append, "%s %s=%s\012", buf,
1399                 (const char*)utf_key, (const char*)utf_value);
1400     }
1401     else {
1402         // if not pax then make a list of fields to report as errors
1403         if (!m_badfit.empty())
1404             m_badfit += _T(", ");
1405         m_badfit += key;
1406     }
1407 }
1408
1409 void wxTarOutputStream::Sync()
1410 {
1411     m_parent_o_stream->Sync();
1412 }
1413
1414 wxFileOffset wxTarOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
1415 {
1416     if (!IsOpened()) {
1417         wxLogError(_("tar entry not open"));
1418         m_lasterror = wxSTREAM_WRITE_ERROR;
1419     }
1420     if (!IsOk() || m_datapos == wxInvalidOffset)
1421         return wxInvalidOffset;
1422
1423     switch (mode) {
1424         case wxFromStart:   break;
1425         case wxFromCurrent: pos += m_pos; break;
1426         case wxFromEnd:     pos += m_maxpos; break;
1427     }
1428
1429     if (pos < 0 || m_parent_o_stream->SeekO(m_datapos + pos) == wxInvalidOffset)
1430         return wxInvalidOffset;
1431
1432     m_pos = pos;
1433     return m_pos;
1434 }
1435
1436 size_t wxTarOutputStream::OnSysWrite(const void *buffer, size_t size)
1437 {
1438     if (!IsOpened()) {
1439         wxLogError(_("tar entry not open"));
1440         m_lasterror = wxSTREAM_WRITE_ERROR;
1441     }
1442     if (!IsOk() || !size)
1443         return 0;
1444
1445     size_t lastwrite = m_parent_o_stream->Write(buffer, size).LastWrite();
1446     m_pos += lastwrite;
1447     if (m_pos > m_maxpos)
1448         m_maxpos = m_pos;
1449
1450     if (lastwrite != size)
1451         m_lasterror = wxSTREAM_WRITE_ERROR;
1452
1453     return lastwrite;
1454 }
1455
1456 #endif // wxUSE_TARSTREAM