diff options
Diffstat (limited to 'apt-pkg/contrib/mmap.cc')
| -rw-r--r-- | apt-pkg/contrib/mmap.cc | 22 |
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()); |