1 files changed, 253 insertions, 0 deletions
diff --git a/tree.c b/tree.c
new file mode 100644
index 0000000000..413a5b1fa6
--- /dev/null
+++ b/tree.c
@@ -0,0 +1,253 @@
+#include "cache.h"
+#include "cache-tree.h"
+#include "tree.h"
+#include "blob.h"
+#include "commit.h"
+#include "tag.h"
+#include "tree-walk.h"
+
+const char *tree_type = "tree";
+
+static int read_one_entry_opt(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, int opt)
+{
+	int len;
+	unsigned int size;
+	struct cache_entry *ce;
+
+	if (S_ISDIR(mode))
+		return READ_TREE_RECURSIVE;
+
+	len = strlen(pathname);
+	size = cache_entry_size(baselen + len);
+	ce = xcalloc(1, size);
+
+	ce->ce_mode = create_ce_mode(mode);
+	ce->ce_flags = create_ce_flags(stage);
+	ce->ce_namelen = baselen + len;
+	memcpy(ce->name, base, baselen);
+	memcpy(ce->name + baselen, pathname, len+1);
+	hashcpy(ce->sha1, sha1);
+	return add_cache_entry(ce, opt);
+}
+
+static int read_one_entry(const unsigned char *sha1, struct strbuf *base,
+			  const char *pathname, unsigned mode, int stage,
+			  void *context)
+{
+	return read_one_entry_opt(sha1, base->buf, base->len, pathname,
+				  mode, stage,
+				  ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
+}
+
+/*
+ * This is used when the caller knows there is no existing entries at
+ * the stage that will conflict with the entry being added.
+ */
+static int read_one_entry_quick(const unsigned char *sha1, struct strbuf *base,
+				const char *pathname, unsigned mode, int stage,
+				void *context)
+{
+	return read_one_entry_opt(sha1, base->buf, base->len, pathname,
+				  mode, stage,
+				  ADD_CACHE_JUST_APPEND);
+}
+
+static int read_tree_1(struct tree *tree, struct strbuf *base,
+		       int stage, const struct pathspec *pathspec,
+		       read_tree_fn_t fn, void *context)
+{
+	struct tree_desc desc;
+	struct name_entry entry;
+	unsigned char sha1[20];
+	int len, oldlen = base->len;
+	enum interesting retval = entry_not_interesting;
+
+	if (parse_tree(tree))
+		return -1;
+
+	init_tree_desc(&desc, tree->buffer, tree->size);
+
+	while (tree_entry(&desc, &entry)) {
+		if (retval != all_entries_interesting) {
+			retval = tree_entry_interesting(&entry, base, 0, pathspec);
+			if (retval == all_entries_not_interesting)
+				break;
+			if (retval == entry_not_interesting)
+				continue;
+		}
+
+		switch (fn(entry.sha1, base,
+			   entry.path, entry.mode, stage, context)) {
+		case 0:
+			continue;
+		case READ_TREE_RECURSIVE:
+			break;
+		default:
+			return -1;
+		}
+
+		if (S_ISDIR(entry.mode))
+			hashcpy(sha1, entry.sha1);
+		else if (S_ISGITLINK(entry.mode)) {
+			struct commit *commit;
+
+			commit = lookup_commit(entry.sha1);
+			if (!commit)
+				die("Commit %s in submodule path %s%s not found",
+				    sha1_to_hex(entry.sha1),
+				    base->buf, entry.path);
+
+			if (parse_commit(commit))
+				die("Invalid commit %s in submodule path %s%s",
+				    sha1_to_hex(entry.sha1),
+				    base->buf, entry.path);
+
+			hashcpy(sha1, commit->tree->object.sha1);
+		}
+		else
+			continue;
+
+		len = tree_entry_len(&entry);
+		strbuf_add(base, entry.path, len);
+		strbuf_addch(base, '/');
+		retval = read_tree_1(lookup_tree(sha1),
+				     base, stage, pathspec,
+				     fn, context);
+		strbuf_setlen(base, oldlen);
+		if (retval)
+			return -1;
+	}
+	return 0;
+}
+
+int read_tree_recursive(struct tree *tree,
+			const char *base, int baselen,
+			int stage, const struct pathspec *pathspec,
+			read_tree_fn_t fn, void *context)
+{
+	struct strbuf sb = STRBUF_INIT;
+	int ret;
+
+	strbuf_add(&sb, base, baselen);
+	ret = read_tree_1(tree, &sb, stage, pathspec, fn, context);
+	strbuf_release(&sb);
+	return ret;
+}
+
+static int cmp_cache_name_compare(const void *a_, const void *b_)
+{
+	const struct cache_entry *ce1, *ce2;
+
+	ce1 = *((const struct cache_entry **)a_);
+	ce2 = *((const struct cache_entry **)b_);
+	return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
+				  ce2->name, ce2->ce_namelen, ce_stage(ce2));
+}
+
+int read_tree(struct tree *tree, int stage, struct pathspec *match)
+{
+	read_tree_fn_t fn = NULL;
+	int i, err;
+
+	/*
+	 * Currently the only existing callers of this function all
+	 * call it with stage=1 and after making sure there is nothing
+	 * at that stage; we could always use read_one_entry_quick().
+	 *
+	 * But when we decide to straighten out git-read-tree not to
+	 * use unpack_trees() in some cases, this will probably start
+	 * to matter.
+	 */
+
+	/*
+	 * See if we have cache entry at the stage.  If so,
+	 * do it the original slow way, otherwise, append and then
+	 * sort at the end.
+	 */
+	for (i = 0; !fn && i < active_nr; i++) {
+		const struct cache_entry *ce = active_cache[i];
+		if (ce_stage(ce) == stage)
+			fn = read_one_entry;
+	}
+
+	if (!fn)
+		fn = read_one_entry_quick;
+	err = read_tree_recursive(tree, "", 0, stage, match, fn, NULL);
+	if (fn == read_one_entry || err)
+		return err;
+
+	/*
+	 * Sort the cache entry -- we need to nuke the cache tree, though.
+	 */
+	cache_tree_free(&active_cache_tree);
+	qsort(active_cache, active_nr, sizeof(active_cache[0]),
+	      cmp_cache_name_compare);
+	return 0;
+}
+
+struct tree *lookup_tree(const unsigned char *sha1)
+{
+	struct object *obj = lookup_object(sha1);
+	if (!obj)
+		return create_object(sha1, alloc_tree_node());
+	return object_as_type(obj, OBJ_TREE, 0);
+}
+
+int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
+{
+	if (item->object.parsed)
+		return 0;
+	item->object.parsed = 1;
+	item->buffer = buffer;
+	item->size = size;
+
+	return 0;
+}
+
+int parse_tree_gently(struct tree *item, int quiet_on_missing)
+{
+	 enum object_type type;
+	 void *buffer;
+	 unsigned long size;
+
+	if (item->object.parsed)
+		return 0;
+	buffer = read_sha1_file(item->object.sha1, &type, &size);
+	if (!buffer)
+		return quiet_on_missing ? -1 :
+			error("Could not read %s",
+			     sha1_to_hex(item->object.sha1));
+	if (type != OBJ_TREE) {
+		free(buffer);
+		return error("Object %s not a tree",
+			     sha1_to_hex(item->object.sha1));
+	}
+	return parse_tree_buffer(item, buffer, size);
+}
+
+void free_tree_buffer(struct tree *tree)
+{
+	free(tree->buffer);
+	tree->buffer = NULL;
+	tree->size = 0;
+	tree->object.parsed = 0;
+}
+
+struct tree *parse_tree_indirect(const unsigned char *sha1)
+{
+	struct object *obj = parse_object(sha1);
+	do {
+		if (!obj)
+			return NULL;
+		if (obj->type == OBJ_TREE)
+			return (struct tree *) obj;
+		else if (obj->type == OBJ_COMMIT)
+			obj = &(((struct commit *) obj)->tree->object);
+		else if (obj->type == OBJ_TAG)
+			obj = ((struct tag *) obj)->tagged;
+		else
+			return NULL;
+		if (!obj->parsed)
+			parse_object(obj->sha1);
+	} while (1);
+}