[libgsf] zip: if an zip member uses zip64, make sure the archive has zip64 trailer.

[Morten Welinder <mortenw src gnome org>]

commit be750b9224f26897466148d23cb09fe1a3bac145
Author: Morten Welinder <terra gnome org>
Date:   Sun Nov 30 14:12:41 2014 -0500

    zip: if an zip member uses zip64, make sure the archive has zip64 trailer.
    
    I'm not actually sure that is required, but it should not hurt.
    xs

 ChangeLog             |    3 +++
 gsf/gsf-outfile-zip.c |    5 +++++
 2 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 6cf8aa0..22035ca 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,9 @@
 
        * gsf/gsf-outfile-zip.c (gsf_outfile_zip_write): When zip64 is
        forced off, don't allow writing beyond the 4G barrier.
+       (zip_header_write): If we write a real zip64 entry, mark the
+       dirent as being zip64.
+       (zip_close_root): If any dirent is zip64, the archive is.
 
 2014-11-29  Morten Welinder  <terra gnome org>
 
diff --git a/gsf/gsf-outfile-zip.c b/gsf/gsf-outfile-zip.c
index 2e01982..56bd7e9 100644
--- a/gsf/gsf-outfile-zip.c
+++ b/gsf/gsf-outfile-zip.c
@@ -324,6 +324,8 @@ zip_close_root (GsfOutput *output)
                GsfZipDirent *dirent = child->vdir->dirent;
                if (!zip_dirent_write (zip->sink, dirent))
                        return FALSE;
+               if (dirent->zip64 == TRUE)
+                       zip64 = TRUE;
        }
        dirend = gsf_output_tell (zip->sink);
 
@@ -562,6 +564,9 @@ zip_header_write (GsfOutfileZip *zip)
 
        g_string_free (extras, TRUE);
 
+       if (real_zip64)
+               dirent->zip64 = TRUE;
+
        return ret;
 }