Merge the new object model thing from Daniel Barkalow

This was a real git merge with conflicts. I'll commit the scripts I used
to do the merge next.

Not pretty, but it's half-way functional.

1 files changed, 67 insertions, 0 deletions

diff --git a/tree.c b/tree.c
new file mode 100644
index 0000000000..1aee098117
--- /dev/null
+++ b/tree.c
@@ -0,0 +1,67 @@
+#include "tree.h"
+#include "blob.h"
+#include "cache.h"
+#include <stdlib.h>
+
+const char *tree_type = "tree";
+
+struct tree *lookup_tree(unsigned char *sha1)
+{
+	struct object *obj = lookup_object(sha1);
+	if (!obj) {
+		struct tree *ret = malloc(sizeof(struct tree));
+		memset(ret, 0, sizeof(struct tree));
+		created_object(sha1, &ret->object);
+		return ret;
+	}
+	if (obj->parsed && obj->type != tree_type) {
+		error("Object %s is a %s, not a tree", 
+		      sha1_to_hex(sha1), obj->type);
+		return NULL;
+	}
+	return (struct tree *) obj;
+}
+
+int parse_tree(struct tree *item)
+{
+	char type[20];
+	void *buffer, *bufptr;
+	unsigned long size;
+	if (item->object.parsed)
+		return 0;
+	item->object.parsed = 1;
+	item->object.type = tree_type;
+	buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
+	if (!buffer)
+		return error("Could not read %s",
+			     sha1_to_hex(item->object.sha1));
+	if (strcmp(type, tree_type))
+		return error("Object %s not a tree",
+			     sha1_to_hex(item->object.sha1));
+	while (size) {
+		struct object *obj;
+		int len = 1+strlen(bufptr);
+		unsigned char *file_sha1 = bufptr + len;
+		char *path = strchr(bufptr, ' ');
+		unsigned int mode;
+		if (size < len + 20 || !path || 
+		    sscanf(bufptr, "%o", &mode) != 1)
+			return -1;
+
+		/* Warn about trees that don't do the recursive thing.. */
+		if (strchr(path, '/')) {
+			item->has_full_path = 1;
+		}
+
+		bufptr += len + 20;
+		size -= len + 20;
+
+		if (S_ISDIR(mode)) {
+			obj = &lookup_tree(file_sha1)->object;
+		} else {
+			obj = &lookup_blob(file_sha1)->object;
+		}
+		add_ref(&item->object, obj);
+	}
+	return 0;
+}