Clean up handling of size fields

We currently have csize, isize, and size concepts, and sometimes the
difference isn't clear. Ensure the following holds:

* size (aka csize): always the compressed size of the package; available
  for everything except local packages (where it will return 0)
* isize: always the installed size of the package; available for all
  three package types

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
index 42e60385..cfc2a100 100644
--- a/lib/libalpm/alpm.h
+++ b/lib/libalpm/alpm.h
@@ -653,7 +653,8 @@ const char *alpm_pkg_get_sha256sum(alpm_pkg_t *pkg);
  */
 const char *alpm_pkg_get_arch(alpm_pkg_t *pkg);
 
-/** Returns the size of the package.
+/** Returns the size of the package. This is only available for sync database
+ * packages and package files, not those loaded from the local database.
  * @param pkg a pointer to package
  * @return the size of the package in bytes.
  */