builtin/get-tar-commit-id: make hash size independent

diff --git a/sha1-file.c b/sha1-file.c
index 494606f7716923468e6f838dae0486a61b454101..bcd9470bce089012ab942973cd841262d35749eb 100644 (file)
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -189,6 +189,14 @@ int hash_algo_by_id(uint32_t format_id)
        return GIT_HASH_UNKNOWN;
 }
 
+int hash_algo_by_length(int len)
+{
+       int i;
+       for (i = 1; i < GIT_HASH_NALGOS; i++)
+               if (len == hash_algos[i].rawsz)
+                       return i;
+       return GIT_HASH_UNKNOWN;
+}
 
 /*
  * This is meant to hold a *small* number of objects that you would