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-rw-r--r--apt-pkg/tagfile.cc41
-rw-r--r--apt-pkg/tagfile.h7
2 files changed, 41 insertions, 7 deletions
diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 040562fff..223618cd1 100644
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -59,19 +59,52 @@ pkgTagFile::~pkgTagFile()
delete [] Buffer;
}
/*}}}*/
+// TagFile::Resize - Resize the internal buffer /*{{{*/
+// ---------------------------------------------------------------------
+/* Resize the internal buffer (double it in size). Fail if a maximum size
+ * size is reached.
+ */
+bool pkgTagFile::Resize()
+{
+ char *tmp;
+ unsigned long EndSize = End - Start;
+
+ // fail is the buffer grows too big
+ if(Size > 1024*1024+1)
+ return false;
+
+ // get new buffer and use it
+ tmp = new char[2*Size];
+ memcpy(tmp, Buffer, Size);
+ Size = Size*2;
+ delete [] Buffer;
+ Buffer = tmp;
+
+ // update the start/end pointers to the new buffer
+ Start = Buffer;
+ End = Start + EndSize;
+ return true;
+}
+
// TagFile::Step - Advance to the next section /*{{{*/
// ---------------------------------------------------------------------
-/* If the Section Scanner fails we refill the buffer and try again. */
+/* If the Section Scanner fails we refill the buffer and try again.
+ * If that fails too, double the buffer size and try again until a
+ * maximum buffer is reached.
+ */
bool pkgTagFile::Step(pkgTagSection &Tag)
{
- if (Tag.Scan(Start,End - Start) == false)
+ while (Tag.Scan(Start,End - Start) == false)
{
if (Fill() == false)
return false;
- if (Tag.Scan(Start,End - Start) == false)
+ if(Tag.Scan(Start,End - Start))
+ break;
+
+ if (Resize() == false)
return _error->Error(_("Unable to parse package file %s (1)"),
- Fd.Name().c_str());
+ Fd.Name().c_str());
}
Start += Tag.size();
iOffset += Tag.size();
diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h
index f7f8155a5..70381ad13 100644
--- a/apt-pkg/tagfile.h
+++ b/apt-pkg/tagfile.h
@@ -75,16 +75,17 @@ class pkgTagFile
bool Done;
unsigned long iOffset;
unsigned long Size;
-
+
bool Fill();
-
+ bool Resize();
+
public:
bool Step(pkgTagSection &Section);
inline unsigned long Offset() {return iOffset;};
bool Jump(pkgTagSection &Tag,unsigned long Offset);
- pkgTagFile(FileFd *F,unsigned long Size = 64*1024);
+ pkgTagFile(FileFd *F,unsigned long Size = 32*1024);
~pkgTagFile();
};