tree_entry(): new tree-walking helper function

diff --git a/tree-walk.c b/tree-walk.c
index 39220582713311c692dde45d6705700995545f38..297c6972b9256578f9cd7a92404dda55c8e34a2e 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -37,7 +37,7 @@ static void entry_extract(struct tree_desc *t, struct name_entry *a)
 
 void update_tree_entry(struct tree_desc *desc)
 {
-       void *buf = desc->buf;
+       const void *buf = desc->buf;
        unsigned long size = desc->size;
        int len = strlen(buf) + 1 + 20;
 
@@ -63,7 +63,7 @@ static const char *get_mode(const char *str, unsigned int *modep)
 
 const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep)
 {
-       void *tree = desc->buf;
+       const void *tree = desc->buf;
        unsigned long size = desc->size;
        int len = strlen(tree)+1;
        const unsigned char *sha1 = tree + len;
@@ -78,6 +78,35 @@ const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pat
        return sha1;
 }
 
+int tree_entry(struct tree_desc *desc, struct name_entry *entry)
+{
+       const void *tree = desc->buf, *path;
+       unsigned long len, size = desc->size;
+
+       if (!size)
+               return 0;
+
+       path = get_mode(tree, &entry->mode);
+       if (!path)
+               die("corrupt tree file");
+
+       entry->path = path;
+       len = strlen(path);
+       entry->pathlen = len;
+
+       path += len + 1;
+       entry->sha1 = path;
+
+       path += 20;
+       len = path - tree;
+       if (len > size)
+               die("corrupt tree file");
+
+       desc->buf = path;
+       desc->size = size - len;
+       return 1;
+}
+
 void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback)
 {
        struct name_entry *entry = xmalloc(n*sizeof(*entry));