[apt.git] / apt-inst / contrib / extracttar.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: extracttar.cc,v 1.8.2.1 2004/01/16 18:58:50 mdz Exp $
/* ######################################################################

   Extract a Tar - Tar Extractor

   Some performance measurements showed that zlib performed quite poorly
   in comparison to a forked gzip process. This tar extractor makes use
   of the fact that dup'd file descriptors have the same seek pointer
   and that gzip will not read past the end of a compressed stream, 
   even if there is more data. We use the dup property to track extraction
   progress and the gzip feature to just feed gzip a fd in the middle
   of an AR file. 
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include<config.h>

#include <apt-pkg/dirstream.h>
#include <apt-pkg/extracttar.h>
#include <apt-pkg/error.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/fileutl.h>

#include <string.h>
#include <algorithm>
#include <string>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <iostream>

#include <apti18n.h>
									/*}}}*/

using namespace std;
    
// The on disk header for a tar file.
struct ExtractTar::TarHeader
{
   char Name[100];
   char Mode[8];
   char UserID[8];
   char GroupID[8];
   char Size[12];
   char MTime[12];
   char Checksum[8];
   char LinkFlag;
   char LinkName[100];
   char MagicNumber[8];
   char UserName[32];
   char GroupName[32];
   char Major[8];
   char Minor[8];      
};
   
// ExtractTar::ExtractTar - Constructor					/*{{{*/
// ---------------------------------------------------------------------
/* */
ExtractTar::ExtractTar(FileFd &Fd,unsigned long Max,string DecompressionProgram) : File(Fd), 
                         MaxInSize(Max), DecompressProg(DecompressionProgram)

{
   GZPid = -1;
   Eof = false;
}
									/*}}}*/
// ExtractTar::ExtractTar - Destructor					/*{{{*/
// ---------------------------------------------------------------------
/* */
ExtractTar::~ExtractTar()
{
   // Error close
   Done(true);
}
									/*}}}*/
// ExtractTar::Done - Reap the gzip sub process				/*{{{*/
// ---------------------------------------------------------------------
/* If the force flag is given then error messages are suppressed - this
   means we hit the end of the tar file but there was still gzip data. */
bool ExtractTar::Done(bool Force)
{
   InFd.Close();
   if (GZPid <= 0)
      return true;

   /* If there is a pending error then we are cleaning up gzip and are
      not interested in it's failures */
   if (_error->PendingError() == true)
      Force = true;
   
   // Make sure we clean it up!
   kill(GZPid,SIGINT);
   string confvar = string("dir::bin::") + DecompressProg;
   if (ExecWait(GZPid,_config->Find(confvar.c_str(),DecompressProg.c_str()).c_str(),
		Force) == false)
   {
      GZPid = -1;
      return Force;
   }
   
   GZPid = -1;
   return true;
}
									/*}}}*/
// ExtractTar::StartGzip - Startup gzip					/*{{{*/
// ---------------------------------------------------------------------
/* This creates a gzip sub process that has its input as the file itself.
   If this tar file is embedded into something like an ar file then 
   gzip will efficiently ignore the extra bits. */
bool ExtractTar::StartGzip()
{
   if (DecompressProg.empty())
   {
      InFd.OpenDescriptor(File.Fd(), FileFd::ReadOnly, FileFd::None, false);
      return true;
   }

   int Pipes[2];
   if (pipe(Pipes) != 0)
      return _error->Errno("pipe",_("Failed to create pipes"));

   // Fork off the process
   GZPid = ExecFork();

   // Spawn the subprocess
   if (GZPid == 0)
   {
      // Setup the FDs
      dup2(Pipes[1],STDOUT_FILENO);
      dup2(File.Fd(),STDIN_FILENO);
      int Fd = open("/dev/null",O_RDWR);
      if (Fd == -1)
	 _exit(101);
      dup2(Fd,STDERR_FILENO);
      close(Fd);
      SetCloseExec(STDOUT_FILENO,false);
      SetCloseExec(STDIN_FILENO,false);
      SetCloseExec(STDERR_FILENO,false);

      const char *Args[3];
      string confvar = string("dir::bin::") + DecompressProg;
      string argv0 = _config->Find(confvar.c_str(),DecompressProg.c_str());
      Args[0] = argv0.c_str();
      Args[1] = "-d";
      Args[2] = 0;
      execvp(Args[0],(char **)Args);
      cerr << _("Failed to exec gzip ") << Args[0] << endl;
      _exit(100);
   }

   // Fix up our FDs
   InFd.OpenDescriptor(Pipes[0], FileFd::ReadOnly, FileFd::None, true);
   close(Pipes[1]);
   return true;
}
									/*}}}*/
// ExtractTar::Go - Perform extraction					/*{{{*/
// ---------------------------------------------------------------------
/* This reads each 512 byte block from the archive and extracts the header
   information into the Item structure. Then it resolves the UID/GID and
   invokes the correct processing function. */
bool ExtractTar::Go(pkgDirStream &Stream)
{   
   if (StartGzip() == false)
      return false;
   
   // Loop over all blocks
   string LastLongLink, ItemLink;
   string LastLongName, ItemName;
   while (1)
   {
      bool BadRecord = false;      
      unsigned char Block[512];      
      if (InFd.Read(Block,sizeof(Block),true) == false)
	 return false;
      
      if (InFd.Eof() == true)
	 break;

      // Get the checksum
      TarHeader *Tar = (TarHeader *)Block;
      unsigned long CheckSum;
      if (StrToNum(Tar->Checksum,CheckSum,sizeof(Tar->Checksum),8) == false)
	 return _error->Error(_("Corrupted archive"));
      
      /* Compute the checksum field. The actual checksum is blanked out
         with spaces so it is not included in the computation */
      unsigned long NewSum = 0;
      memset(Tar->Checksum,' ',sizeof(Tar->Checksum));
      for (int I = 0; I != sizeof(Block); I++)
	 NewSum += Block[I];
      
      /* Check for a block of nulls - in this case we kill gzip, GNU tar
       	 does this.. */
      if (NewSum == ' '*sizeof(Tar->Checksum))
	 return Done(true);
      
      if (NewSum != CheckSum)
	 return _error->Error(_("Tar checksum failed, archive corrupted"));
   
      // Decode all of the fields
      pkgDirStream::Item Itm;
      if (StrToNum(Tar->Mode,Itm.Mode,sizeof(Tar->Mode),8) == false ||
          (Base256ToNum(Tar->UserID,Itm.UID,8) == false &&
	     StrToNum(Tar->UserID,Itm.UID,sizeof(Tar->UserID),8) == false) ||
          (Base256ToNum(Tar->GroupID,Itm.GID,8) == false &&
	     StrToNum(Tar->GroupID,Itm.GID,sizeof(Tar->GroupID),8) == false) ||
          (Base256ToNum(Tar->Size,Itm.Size,12) == false &&
	     StrToNum(Tar->Size,Itm.Size,sizeof(Tar->Size),8) == false) ||
          (Base256ToNum(Tar->MTime,Itm.MTime,12) == false &&
	     StrToNum(Tar->MTime,Itm.MTime,sizeof(Tar->MTime),8) == false) ||
	  StrToNum(Tar->Major,Itm.Major,sizeof(Tar->Major),8) == false ||
	  StrToNum(Tar->Minor,Itm.Minor,sizeof(Tar->Minor),8) == false)
	 return _error->Error(_("Corrupted archive"));

      // Grab the filename and link target: use last long name if one was
      // set, otherwise use the header value as-is, but remember that it may
      // fill the entire 100-byte block and needs to be zero-terminated.
      // See Debian Bug #689582.
      if (LastLongName.empty() == false)
	 Itm.Name = (char *)LastLongName.c_str();
      else
	 Itm.Name = (char *)ItemName.assign(Tar->Name, sizeof(Tar->Name)).c_str();
      if (Itm.Name[0] == '.' && Itm.Name[1] == '/' && Itm.Name[2] != 0)
	 Itm.Name += 2;

      if (LastLongLink.empty() == false)
	 Itm.LinkTarget = (char *)LastLongLink.c_str();
      else
	 Itm.LinkTarget = (char *)ItemLink.assign(Tar->LinkName, sizeof(Tar->LinkName)).c_str();

      // Convert the type over
      switch (Tar->LinkFlag)
      {
	 case NormalFile0:
	 case NormalFile:
	 Itm.Type = pkgDirStream::Item::File;
	 break;
	 
	 case HardLink:
	 Itm.Type = pkgDirStream::Item::HardLink;
	 break;
	 
	 case SymbolicLink:
	 Itm.Type = pkgDirStream::Item::SymbolicLink;
	 break;
	 
	 case CharacterDevice:
	 Itm.Type = pkgDirStream::Item::CharDevice;
	 break;
	    
	 case BlockDevice:
	 Itm.Type = pkgDirStream::Item::BlockDevice;
	 break;
	 
	 case Directory:
	 Itm.Type = pkgDirStream::Item::Directory;
	 break;
	 
	 case FIFO:
	 Itm.Type = pkgDirStream::Item::FIFO;
	 break;

	 case GNU_LongLink:
	 {
	    unsigned long Length = Itm.Size;
	    unsigned char Block[512];
	    while (Length > 0)
	    {
	       if (InFd.Read(Block,sizeof(Block),true) == false)
		  return false;
	       if (Length <= sizeof(Block))
	       {
		  LastLongLink.append(Block,Block+sizeof(Block));
		  break;
	       }	       
	       LastLongLink.append(Block,Block+sizeof(Block));
	       Length -= sizeof(Block);
	    }
	    continue;
	 }
	 
	 case GNU_LongName:
	 {
	    unsigned long Length = Itm.Size;
	    unsigned char Block[512];
	    while (Length > 0)
	    {
	       if (InFd.Read(Block,sizeof(Block),true) == false)
		  return false;
	       if (Length < sizeof(Block))
	       {
		  LastLongName.append(Block,Block+sizeof(Block));
		  break;
	       }	       
	       LastLongName.append(Block,Block+sizeof(Block));
	       Length -= sizeof(Block);
	    }
	    continue;
	 }
	 
	 default:
	 BadRecord = true;
	 _error->Warning(_("Unknown TAR header type %u, member %s"),(unsigned)Tar->LinkFlag,Tar->Name);
	 break;
      }
      
      int Fd = -1;
      if (BadRecord == false)
	 if (Stream.DoItem(Itm,Fd) == false)
	    return false;
      
      // Copy the file over the FD
      unsigned long Size = Itm.Size;
      while (Size != 0)
      {
	 unsigned char Junk[32*1024];
	 unsigned long Read = min(Size,(unsigned long)sizeof(Junk));
	 if (InFd.Read(Junk,((Read+511)/512)*512) == false)
	    return false;
	 
	 if (BadRecord == false)
	 {
	    if (Fd > 0)
	    {
	       if (write(Fd,Junk,Read) != (signed)Read)
		  return Stream.Fail(Itm,Fd);
	    }
	    else
	    {
	       /* An Fd of -2 means to send to a special processing
		  function */
	       if (Fd == -2)
		  if (Stream.Process(Itm,Junk,Read,Itm.Size - Size) == false)
		     return Stream.Fail(Itm,Fd);
	    }
	 }
	 
	 Size -= Read;
      }
      
      // And finish up
      if (BadRecord == false)
	 if (Stream.FinishedFile(Itm,Fd) == false)
	    return false;
      
      LastLongName.erase();
      LastLongLink.erase();
   }
   
   return Done(false);
}
									/*}}}*/
Commit	Line	Data
b2e465d6 AL	1	// -- mode: cpp; mode: fold --
b2e465d6 AL	2	// Description /{{{/
7db98ffc	3	// $Id: extracttar.cc,v 1.8.2.1 2004/01/16 18:58:50 mdz Exp $
b2e465d6 AL	4	/* ######################################################################
	5
	6	Extract a Tar - Tar Extractor
	7
	8	Some performance measurements showed that zlib performed quite poorly
1e3f4083	9	in comparison to a forked gzip process. This tar extractor makes use
b2e465d6 AL	10	of the fact that dup'd file descriptors have the same seek pointer
	11	and that gzip will not read past the end of a compressed stream,
	12	even if there is more data. We use the dup property to track extraction
	13	progress and the gzip feature to just feed gzip a fd in the middle
	14	of an AR file.
	15
	16	##################################################################### */
	17	/}}}/
	18	// Include Files /{{{/
ea542140	19	#include<config.h>
b2e465d6	20
472ff00e	21	#include <apt-pkg/dirstream.h>
ea542140	22	#include <apt-pkg/extracttar.h>
b2e465d6 AL	23	#include <apt-pkg/error.h>
	24	#include <apt-pkg/strutl.h>
	25	#include <apt-pkg/configuration.h>
453b82a3	26	#include <apt-pkg/fileutl.h>
b2e465d6	27
453b82a3 DK	28	#include <string.h>
	29	#include <algorithm>
	30	#include <string>
b2e465d6 AL	31	#include <unistd.h>
	32	#include <signal.h>
	33	#include <fcntl.h>
90f057fd	34	#include <iostream>
ea542140	35
d77559ac	36	#include <apti18n.h>
b2e465d6	37	/}}}/
d77559ac	38
584e4558	39	using namespace std;
4520bfdf	40
b2e465d6 AL	41	// The on disk header for a tar file.
	42	struct ExtractTar::TarHeader
	43	{
	44	char Name[100];
	45	char Mode[8];
	46	char UserID[8];
	47	char GroupID[8];
	48	char Size[12];
	49	char MTime[12];
	50	char Checksum[8];
	51	char LinkFlag;
	52	char LinkName[100];
	53	char MagicNumber[8];
	54	char UserName[32];
	55	char GroupName[32];
	56	char Major[8];
	57	char Minor[8];
	58	};
	59
	60	// ExtractTar::ExtractTar - Constructor /{{{/
	61	// ---------------------------------------------------------------------
	62	/* */
b21c0438 MZ	63	ExtractTar::ExtractTar(FileFd &Fd,unsigned long Max,string DecompressionProgram) : File(Fd),
b21c0438 MZ	64	MaxInSize(Max), DecompressProg(DecompressionProgram)
b2e465d6 AL	65
	66	{
	67	GZPid = -1;
b2e465d6 AL	68	Eof = false;
	69	}
	70	/}}}/
	71	// ExtractTar::ExtractTar - Destructor /{{{/
	72	// ---------------------------------------------------------------------
	73	/* */
	74	ExtractTar::~ExtractTar()
	75	{
4520bfdf AL	76	// Error close
4520bfdf AL	77	Done(true);
b2e465d6 AL	78	}
	79	/}}}/
	80	// ExtractTar::Done - Reap the gzip sub process /{{{/
	81	// ---------------------------------------------------------------------
	82	/* If the force flag is given then error messages are suppressed - this
	83	means we hit the end of the tar file but there was still gzip data. */
	84	bool ExtractTar::Done(bool Force)
	85	{
	86	InFd.Close();
	87	if (GZPid <= 0)
	88	return true;
	89
	90	/* If there is a pending error then we are cleaning up gzip and are
	91	not interested in it's failures */
	92	if (_error->PendingError() == true)
	93	Force = true;
	94
	95	// Make sure we clean it up!
	96	kill(GZPid,SIGINT);
b21c0438 MZ	97	string confvar = string("dir::bin::") + DecompressProg;
b21c0438 MZ	98	if (ExecWait(GZPid,_config->Find(confvar.c_str(),DecompressProg.c_str()).c_str(),
b2e465d6 AL	99	Force) == false)
	100	{
	101	GZPid = -1;
	102	return Force;
	103	}
	104
	105	GZPid = -1;
	106	return true;
	107	}
	108	/}}}/
	109	// ExtractTar::StartGzip - Startup gzip /{{{/
	110	// ---------------------------------------------------------------------
	111	/* This creates a gzip sub process that has its input as the file itself.
	112	If this tar file is embedded into something like an ar file then
	113	gzip will efficiently ignore the extra bits. */
	114	bool ExtractTar::StartGzip()
	115	{
3255db2d GJ	116	if (DecompressProg.empty())
	117	{
	118	InFd.OpenDescriptor(File.Fd(), FileFd::ReadOnly, FileFd::None, false);
	119	return true;
	120	}
	121
b2e465d6 AL	122	int Pipes[2];
b2e465d6 AL	123	if (pipe(Pipes) != 0)
05eb7df0	124	return _error->Errno("pipe",_("Failed to create pipes"));
cf4ff3b7	125
b2e465d6 AL	126	// Fork off the process
	127	GZPid = ExecFork();
	128
	129	// Spawn the subprocess
	130	if (GZPid == 0)
	131	{
	132	// Setup the FDs
	133	dup2(Pipes[1],STDOUT_FILENO);
	134	dup2(File.Fd(),STDIN_FILENO);
	135	int Fd = open("/dev/null",O_RDWR);
	136	if (Fd == -1)
	137	_exit(101);
	138	dup2(Fd,STDERR_FILENO);
	139	close(Fd);
	140	SetCloseExec(STDOUT_FILENO,false);
cf4ff3b7	141	SetCloseExec(STDIN_FILENO,false);
b2e465d6	142	SetCloseExec(STDERR_FILENO,false);
cf4ff3b7	143
b2e465d6	144	const char *Args[3];
b21c0438	145	string confvar = string("dir::bin::") + DecompressProg;
a9be43ff MV	146	string argv0 = _config->Find(confvar.c_str(),DecompressProg.c_str());
a9be43ff MV	147	Args[0] = argv0.c_str();
b2e465d6 AL	148	Args[1] = "-d";
b2e465d6 AL	149	Args[2] = 0;
b21c0438	150	execvp(Args[0],(char **)Args);
05eb7df0	151	cerr << _("Failed to exec gzip ") << Args[0] << endl;
b2e465d6 AL	152	_exit(100);
	153	}
	154
	155	// Fix up our FDs
2448a064	156	InFd.OpenDescriptor(Pipes[0], FileFd::ReadOnly, FileFd::None, true);
b2e465d6 AL	157	close(Pipes[1]);
	158	return true;
	159	}
	160	/}}}/
	161	// ExtractTar::Go - Perform extraction /{{{/
	162	// ---------------------------------------------------------------------
	163	/* This reads each 512 byte block from the archive and extracts the header
	164	information into the Item structure. Then it resolves the UID/GID and
	165	invokes the correct processing function. */
	166	bool ExtractTar::Go(pkgDirStream &Stream)
	167	{
	168	if (StartGzip() == false)
	169	return false;
	170
	171	// Loop over all blocks
a07b81e8 OS	172	string LastLongLink, ItemLink;
a07b81e8 OS	173	string LastLongName, ItemName;
b2e465d6 AL	174	while (1)
	175	{
	176	bool BadRecord = false;
	177	unsigned char Block[512];
	178	if (InFd.Read(Block,sizeof(Block),true) == false)
	179	return false;
	180
	181	if (InFd.Eof() == true)
	182	break;
	183
	184	// Get the checksum
	185	TarHeader Tar = (TarHeader )Block;
	186	unsigned long CheckSum;
	187	if (StrToNum(Tar->Checksum,CheckSum,sizeof(Tar->Checksum),8) == false)
05eb7df0	188	return _error->Error(_("Corrupted archive"));
b2e465d6 AL	189
	190	/* Compute the checksum field. The actual checksum is blanked out
	191	with spaces so it is not included in the computation */
	192	unsigned long NewSum = 0;
	193	memset(Tar->Checksum,' ',sizeof(Tar->Checksum));
	194	for (int I = 0; I != sizeof(Block); I++)
	195	NewSum += Block[I];
	196
	197	/* Check for a block of nulls - in this case we kill gzip, GNU tar
	198	does this.. */
	199	if (NewSum == ' '*sizeof(Tar->Checksum))
	200	return Done(true);
	201
	202	if (NewSum != CheckSum)
db0db9fe	203	return _error->Error(_("Tar checksum failed, archive corrupted"));
b2e465d6 AL	204
	205	// Decode all of the fields
	206	pkgDirStream::Item Itm;
b2e465d6	207	if (StrToNum(Tar->Mode,Itm.Mode,sizeof(Tar->Mode),8) == false \|\|
54f2f0a3 NH	208	(Base256ToNum(Tar->UserID,Itm.UID,8) == false &&
	209	StrToNum(Tar->UserID,Itm.UID,sizeof(Tar->UserID),8) == false) \|\|
	210	(Base256ToNum(Tar->GroupID,Itm.GID,8) == false &&
	211	StrToNum(Tar->GroupID,Itm.GID,sizeof(Tar->GroupID),8) == false) \|\|
	212	(Base256ToNum(Tar->Size,Itm.Size,12) == false &&
	213	StrToNum(Tar->Size,Itm.Size,sizeof(Tar->Size),8) == false) \|\|
	214	(Base256ToNum(Tar->MTime,Itm.MTime,12) == false &&
	215	StrToNum(Tar->MTime,Itm.MTime,sizeof(Tar->MTime),8) == false) \|\|
b2e465d6 AL	216	StrToNum(Tar->Major,Itm.Major,sizeof(Tar->Major),8) == false \|\|
b2e465d6 AL	217	StrToNum(Tar->Minor,Itm.Minor,sizeof(Tar->Minor),8) == false)
05eb7df0	218	return _error->Error(_("Corrupted archive"));
a07b81e8 OS	219
	220	// Grab the filename and link target: use last long name if one was
	221	// set, otherwise use the header value as-is, but remember that it may
	222	// fill the entire 100-byte block and needs to be zero-terminated.
	223	// See Debian Bug #689582.
b2e465d6 AL	224	if (LastLongName.empty() == false)
	225	Itm.Name = (char *)LastLongName.c_str();
	226	else
a07b81e8	227	Itm.Name = (char *)ItemName.assign(Tar->Name, sizeof(Tar->Name)).c_str();
b2e465d6 AL	228	if (Itm.Name[0] == '.' && Itm.Name[1] == '/' && Itm.Name[2] != 0)
b2e465d6 AL	229	Itm.Name += 2;
b2e465d6 AL	230
	231	if (LastLongLink.empty() == false)
	232	Itm.LinkTarget = (char *)LastLongLink.c_str();
a07b81e8 OS	233	else
	234	Itm.LinkTarget = (char *)ItemLink.assign(Tar->LinkName, sizeof(Tar->LinkName)).c_str();
	235
b2e465d6 AL	236	// Convert the type over
	237	switch (Tar->LinkFlag)
	238	{
	239	case NormalFile0:
	240	case NormalFile:
	241	Itm.Type = pkgDirStream::Item::File;
	242	break;
	243
	244	case HardLink:
	245	Itm.Type = pkgDirStream::Item::HardLink;
	246	break;
	247
	248	case SymbolicLink:
	249	Itm.Type = pkgDirStream::Item::SymbolicLink;
	250	break;
	251
	252	case CharacterDevice:
	253	Itm.Type = pkgDirStream::Item::CharDevice;
	254	break;
	255
	256	case BlockDevice:
	257	Itm.Type = pkgDirStream::Item::BlockDevice;
	258	break;
	259
	260	case Directory:
	261	Itm.Type = pkgDirStream::Item::Directory;
	262	break;
	263
	264	case FIFO:
	265	Itm.Type = pkgDirStream::Item::FIFO;
	266	break;
	267
	268	case GNU_LongLink:
	269	{
	270	unsigned long Length = Itm.Size;
	271	unsigned char Block[512];
	272	while (Length > 0)
	273	{
	274	if (InFd.Read(Block,sizeof(Block),true) == false)
	275	return false;
	276	if (Length <= sizeof(Block))
	277	{
	278	LastLongLink.append(Block,Block+sizeof(Block));
	279	break;
	280	}
	281	LastLongLink.append(Block,Block+sizeof(Block));
	282	Length -= sizeof(Block);
	283	}
	284	continue;
	285	}
	286
	287	case GNU_LongName:
	288	{
	289	unsigned long Length = Itm.Size;
	290	unsigned char Block[512];
	291	while (Length > 0)
	292	{
	293	if (InFd.Read(Block,sizeof(Block),true) == false)
	294	return false;
	295	if (Length < sizeof(Block))
	296	{
	297	LastLongName.append(Block,Block+sizeof(Block));
	298	break;
	299	}
300	LastLongName.append(Block,Block+sizeof(Block));
301	Length -= sizeof(Block);
302	}
303	continue;
304	}
305
306	default:
307	BadRecord = true;
4c6a9fad	308	_error->Warning(_("Unknown TAR header type %u, member %s"),(unsigned)Tar->LinkFlag,Tar->Name);
b2e465d6 AL	309	break;
	310	}
	311
	312	int Fd = -1;
	313	if (BadRecord == false)
	314	if (Stream.DoItem(Itm,Fd) == false)
	315	return false;
	316
	317	// Copy the file over the FD
	318	unsigned long Size = Itm.Size;
	319	while (Size != 0)
	320	{
	321	unsigned char Junk[32*1024];
42ab8223	322	unsigned long Read = min(Size,(unsigned long)sizeof(Junk));
b2e465d6 AL	323	if (InFd.Read(Junk,((Read+511)/512)*512) == false)
	324	return false;
	325
	326	if (BadRecord == false)
	327	{
	328	if (Fd > 0)
	329	{
	330	if (write(Fd,Junk,Read) != (signed)Read)
	331	return Stream.Fail(Itm,Fd);
	332	}
	333	else
	334	{
	335	/* An Fd of -2 means to send to a special processing
	336	function */
	337	if (Fd == -2)
	338	if (Stream.Process(Itm,Junk,Read,Itm.Size - Size) == false)
	339	return Stream.Fail(Itm,Fd);
	340	}
	341	}
	342
	343	Size -= Read;
	344	}
	345
	346	// And finish up
59152cdb	347	if (BadRecord == false)
b2e465d6 AL	348	if (Stream.FinishedFile(Itm,Fd) == false)
	349	return false;
	350
	351	LastLongName.erase();
	352	LastLongLink.erase();
	353	}
	354
	355	return Done(false);
	356	}
	357	/}}}/