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-rw-r--r--apt-pkg/contrib/mmap.cc22
1 files changed, 20 insertions, 2 deletions
diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc
index f76169a92..a67ab3698 100644
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -66,7 +66,7 @@ MMap::~MMap()
bool MMap::Map(FileFd &Fd)
{
iSize = Fd.Size();
-
+
// Set the permissions.
int Prot = PROT_READ;
int Map = MAP_SHARED;
@@ -77,7 +77,18 @@ bool MMap::Map(FileFd &Fd)
if (iSize == 0)
return _error->Error(_("Can't mmap an empty file"));
-
+
+ // We can't mmap compressed fd's directly, so we need to read it completely
+ if (Fd.IsCompressed() == true)
+ {
+ if ((Flags & ReadOnly) != ReadOnly)
+ return _error->Error("Compressed file %s can only be mapped readonly", Fd.Name().c_str());
+ Base = new unsigned char[iSize];
+ if (Fd.Seek(0L) == false || Fd.Read(Base, iSize) == false)
+ return false;
+ return true;
+ }
+
// Map it.
Base = mmap(0,iSize,Prot,Map,Fd.Fd(),0);
if (Base == (void *)-1)
@@ -86,6 +97,13 @@ bool MMap::Map(FileFd &Fd)
{
// The filesystem doesn't support this particular kind of mmap.
// So we allocate a buffer and read the whole file into it.
+ if ((Flags & ReadOnly) == ReadOnly)
+ {
+ // for readonly, we don't need sync, so make it simple
+ Base = new unsigned char[iSize];
+ return Fd.Read(Base, iSize);
+ }
+ // FIXME: Writing to compressed fd's ?
int const dupped_fd = dup(Fd.Fd());
if (dupped_fd == -1)
return _error->Errno("mmap", _("Couldn't duplicate file descriptor %i"), Fd.Fd());