* apt-pkg/contrib/fileutl.h:

  - store the offset in the internal fd before calculate size of
    the zlib-handled file to jump back to this place again

It jumped back to the position of the content - which is wrong as
the internal fd is compressed and even reseting to the beginning of
the file doesn't work as zlib uses an internal buffer, so while we
might haven't read anything yet zlib might have done so already…

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 2bbf3a1b14b4397fcff48486073fe96de5df3cec..28898fc34820834aaf6f76900021f6a680e657ba 100644 (file)
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1347,6 +1347,7 @@ unsigned long long FileFd::Size()
    // gzopen in "direct" mode as well
    else if (d->gz && !gzdirect(d->gz) && size > 0)
    {
+       off_t const oldPos = lseek(iFd,0,SEEK_CUR);
        /* unfortunately zlib.h doesn't provide a gzsize(), so we have to do
        * this ourselves; the original (uncompressed) file size is the last 32
        * bits of the file */
@@ -1364,8 +1365,9 @@ unsigned long long FileFd::Size()
        size = tmp_size;
 #endif
 
-       if (lseek(iFd, d->seekpos, SEEK_SET) < 0)
+       if (lseek(iFd, oldPos, SEEK_SET) < 0)
           return _error->Errno("lseek","Unable to seek in gzipped file");
+
        return size;
    }
 #endif

diff --git a/debian/changelog b/debian/changelog
index 2e8bcfb13030e872b8f605e6b5767f182f116a50..c7c33fef117fa44502d6d6306a9d50fdcbd014f5 100644 (file)
--- a/debian/changelog
+++ b/debian/changelog
@@ -9,12 +9,15 @@ apt (0.8.16~exp10) UNRELEASED; urgency=low
   * apt-pkg/deb/dpkgpm.cc:
     - check if dpkg supports multiarch with --assert-multi-arch
       and if it does be always explicit about the architecture
+  * apt-pkg/contrib/fileutl.h:
+    - store the offset in the internal fd before calculate size of
+      the zlib-handled file to jump back to this place again
 
   [ Michael Vogt ]
-  * apt-pkg/contrib/fileutils.h:
+  * apt-pkg/contrib/fileutl.h:
     - fix segfault from python-apt testsuite
 
- -- David Kalnischkies <kalnischkies@gmail.com>  Fri, 13 Jan 2012 17:29:07 +0100
+ -- David Kalnischkies <kalnischkies@gmail.com>  Wed, 18 Jan 2012 00:47:54 +0100
 
 apt (0.8.16~exp9) experimental; urgency=low