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-rw-r--r--apt-inst/contrib/extracttar.cc32
1 files changed, 18 insertions, 14 deletions
diff --git a/apt-inst/contrib/extracttar.cc b/apt-inst/contrib/extracttar.cc
index 49ed5db56..41301d1a6 100644
--- a/apt-inst/contrib/extracttar.cc
+++ b/apt-inst/contrib/extracttar.cc
@@ -6,7 +6,7 @@
Extract a Tar - Tar Extractor
Some performance measurements showed that zlib performed quite poorly
- in comparision to a forked gzip process. This tar extractor makes use
+ 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
@@ -111,6 +111,12 @@ bool ExtractTar::Done(bool Force)
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"));
@@ -161,8 +167,8 @@ bool ExtractTar::Go(pkgDirStream &Stream)
return false;
// Loop over all blocks
- string LastLongLink;
- string LastLongName;
+ string LastLongLink, ItemLink;
+ string LastLongName, ItemName;
while (1)
{
bool BadRecord = false;
@@ -208,25 +214,23 @@ bool ExtractTar::Go(pkgDirStream &Stream)
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
+
+ // 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
- {
- Tar->Name[sizeof(Tar->Name)-1] = 0;
- Itm.Name = Tar->Name;
- }
+ 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;
-
- // Grab the link target
- Tar->Name[sizeof(Tar->LinkName)-1] = 0;
- Itm.LinkTarget = Tar->LinkName;
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)
{