sha1_file: guard against invalid loose subdirectory numbers

diff --git a/cache.h b/cache.h
index e1f0e182ad011d5a3b6912f48b597dcc6d1070b0..7f7ec5d56d8244d42ebe824b1bbc960ddf87634e 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -11,6 +11,7 @@
 #include "string-list.h"
 #include "pack-revindex.h"
 #include "hash.h"
+#include "sha1-array.h"
 
 #ifndef platform_SHA_CTX
 /*
@@ -1579,6 +1580,16 @@ extern struct alternate_object_database {
        struct strbuf scratch;
        size_t base_len;
 
+       /*
+        * Used to store the results of readdir(3) calls when searching
+        * for unique abbreviated hashes.  This cache is never
+        * invalidated, thus it's racy and not necessarily accurate.
+        * That's fine for its purpose; don't use it for tasks requiring
+        * greater accuracy!
+        */
+       char loose_objects_subdir_seen[256];
+       struct oid_array loose_objects_cache;
+
        char path[FLEX_ARRAY];
 } *alt_odb_list;
 extern void prepare_alt_odb(void);
@@ -1794,9 +1805,15 @@ typedef int each_loose_object_fn(const struct object_id *oid,
 typedef int each_loose_cruft_fn(const char *basename,
                                const char *path,
                                void *data);
-typedef int each_loose_subdir_fn(int nr,
+typedef int each_loose_subdir_fn(unsigned int nr,
                                 const char *path,
                                 void *data);
+int for_each_file_in_obj_subdir(unsigned int subdir_nr,
+                               struct strbuf *path,
+                               each_loose_object_fn obj_cb,
+                               each_loose_cruft_fn cruft_cb,
+                               each_loose_subdir_fn subdir_cb,
+                               void *data);
 int for_each_loose_file_in_objdir(const char *path,
                                  each_loose_object_fn obj_cb,
                                  each_loose_cruft_fn cruft_cb,