merge-recursive: do not use on-file index when not needed.

diff --git a/tree-walk.c b/tree-walk.c
index 297c6972b9256578f9cd7a92404dda55c8e34a2e..70f899957e8ce511f0f5a470e8b6927d58d1b63e 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -43,7 +43,7 @@ void update_tree_entry(struct tree_desc *desc)
 
        if (size < len)
                die("corrupt tree file");
-       desc->buf = buf + len;
+       desc->buf = (char *) buf + len;
        desc->size = size - len;
 }
 
@@ -66,7 +66,7 @@ const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pat
        const void *tree = desc->buf;
        unsigned long size = desc->size;
        int len = strlen(tree)+1;
-       const unsigned char *sha1 = tree + len;
+       const unsigned char *sha1 = (unsigned char *) tree + len;
        const char *path;
        unsigned int mode;
 
@@ -80,7 +80,8 @@ const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pat
 
 int tree_entry(struct tree_desc *desc, struct name_entry *entry)
 {
-       const void *tree = desc->buf, *path;
+       const void *tree = desc->buf;
+       const char *path;
        unsigned long len, size = desc->size;
 
        if (!size)
@@ -95,10 +96,10 @@ int tree_entry(struct tree_desc *desc, struct name_entry *entry)
        entry->pathlen = len;
 
        path += len + 1;
-       entry->sha1 = path;
+       entry->sha1 = (const unsigned char *) path;
 
        path += 20;
-       len = path - tree;
+       len = path - (char *) tree;
        if (len > size)
                die("corrupt tree file");
 
@@ -112,7 +113,6 @@ void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callb
        struct name_entry *entry = xmalloc(n*sizeof(*entry));
 
        for (;;) {
-               struct name_entry entry[3];
                unsigned long mask = 0;
                int i, last;
 
@@ -178,7 +178,7 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
                if (cmp < 0)
                        break;
                if (entrylen == namelen) {
-                       memcpy(result, sha1, 20);
+                       hashcpy(result, sha1);
                        return 0;
                }
                if (name[entrylen] != '/')
@@ -186,7 +186,7 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
                if (!S_ISDIR(*mode))
                        break;
                if (++entrylen == namelen) {
-                       memcpy(result, sha1, 20);
+                       hashcpy(result, sha1);
                        return 0;
                }
                return get_tree_entry(sha1, name + entrylen, result, mode);
@@ -199,10 +199,17 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
        int retval;
        void *tree;
        struct tree_desc t;
+       unsigned char root[20];
 
-       tree = read_object_with_reference(tree_sha1, tree_type, &t.size, NULL);
+       tree = read_object_with_reference(tree_sha1, tree_type, &t.size, root);
        if (!tree)
                return -1;
+
+       if (name[0] == '\0') {
+               hashcpy(sha1, root);
+               return 0;
+       }
+
        t.buf = tree;
        retval = find_tree_entry(&t, name, sha1, mode);
        free(tree);