Added the ability to retrieve the file using directories

Files can be refered to directly using their hash, or the hash of their
directory and the file name.

include/ipfs/importer/resolver.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "ipfs/merkledag/node.h"
+
+/**
+ * Interogate the path and the current node, looking
+ * for the desired node.
+ * @param path the current path
+ * @param from the current node (or NULL if it is the first call)
+ * @returns what we are looking for, or NULL if it wasn't found
+ */
+struct Node* ipfs_resolver_get(const char* path, struct Node* from, const struct FSRepo* fs_repo);

include/ipfs/merkledag/merkledag.h

@@ -25,4 +25,13 @@ int ipfs_merkledag_add(struct Node* node, struct FSRepo* fs_repo, size_t* bytes_
  */
 int ipfs_merkledag_get(const unsigned char* hash, size_t hash_size, struct Node** node, const struct FSRepo* fs_repo);
 
+/***
+ * Retrieves a node from the datastore based on the multihash
+ * @param multihash the base58 encoded multihash (should start with Qm) as a null terminated string
+ * @param node the node to be created
+ * @param fs_repo the repository
+ * @returns true(1) on success
+ */
+int ipfs_merkledag_get_by_multihash(const unsigned char* multihash, size_t multihash_length, struct Node** node, const struct FSRepo* fs_repo);
+
 #endif

include/ipfs/merkledag/node.h

@@ -142,6 +142,13 @@ int ipfs_node_new(struct Node** node);
  */
 int ipfs_node_create_directory(struct Node** node);
 
+/***
+ * Determine if this node is actually a directory
+ * @param node the node to examine
+ * @returns true(1) if this node is a directory. Otherwise, false(0)
+ */
+int ipfs_node_is_directory(struct Node* node);
+
 /**
  * sets the Cid into the struct element titled cached
  * @param node the node to work with