2 files changed, 19 insertions, 0 deletions
diff --git a/apt-pkg/contrib/hashes.cc b/apt-pkg/contrib/hashes.cc
index 0fa443b4a..11a7e479b 100644
--- a/apt-pkg/contrib/hashes.cc
+++ b/apt-pkg/contrib/hashes.cc
@@ -23,6 +23,7 @@
 #include <stddef.h>
 #include <algorithm>
 #include <unistd.h>
+#include <stdlib.h>
 #include <string>
 #include <iostream>
 									/*}}}*/
@@ -178,6 +179,15 @@ HashString const * HashStringList::find(char const * const type) const /*{{{*/
    return NULL;
 }
 									/*}}}*/
+unsigned long long HashStringList::FileSize() const			/*{{{*/
+{
+   HashString const * const hsf = find("Checksum-FileSize");
+   if (hsf == NULL)
+      return 0;
+   std::string const hv = hsf->HashValue();
+   return strtoull(hv.c_str(), NULL, 10);
+}
+									/*}}}*/
 bool HashStringList::supported(char const * const type)			/*{{{*/
 {
    for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
diff --git a/apt-pkg/contrib/hashes.h b/apt-pkg/contrib/hashes.h
index ac13c8ace..176ce4faa 100644
--- a/apt-pkg/contrib/hashes.h
+++ b/apt-pkg/contrib/hashes.h
@@ -87,6 +87,15 @@ class HashStringList
     */
    HashString const * find(char const * const type) const;
    HashString const * find(std::string const &type) const { return find(type.c_str()); }
+
+   /** finds the filesize hash and returns it as number
+    *
+    * @return beware: if the size isn't known we return \b 0 here,
+    * just like we would do for an empty file. If that is a problem
+    * for you have to get the size manually out of the list.
+    */
+   unsigned long long FileSize() const;
+
    /** check if the given hash type is supported
     *
     * @param type to check