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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-17 15:49:26 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-20 03:18:47 +0200
commit71895fb039d7f19ab277aa6094d9755bb6827565 (patch)
tree9839f987fce8700084743811f70ff678e28e5432 /include/sqfs
parentab0c4a02ba9d1a836f62a8601699c971b72eec07 (diff)
Add fstree like tree deserialization function to dir reader
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'include/sqfs')
-rw-r--r--include/sqfs/dir.h124
-rw-r--r--include/sqfs/error.h2
-rw-r--r--include/sqfs/predef.h1
3 files changed, 127 insertions, 0 deletions
diff --git a/include/sqfs/dir.h b/include/sqfs/dir.h
index d8603d7..d57ad73 100644
--- a/include/sqfs/dir.h
+++ b/include/sqfs/dir.h
@@ -192,6 +192,95 @@ struct sqfs_dir_index_t {
uint8_t name[];
};
+typedef enum {
+ /**
+ * @brief Omit device special files from the final tree.
+ */
+ SQFS_TREE_NO_DEVICES = 0x01,
+
+ /**
+ * @brief Omit socket files from the final tree.
+ */
+ SQFS_TREE_NO_SOCKETS = 0x02,
+
+ /**
+ * @brief Omit named pipes from the final tree.
+ */
+ SQFS_TREE_NO_FIFO = 0x04,
+
+ /**
+ * @brief Omit symbolic links from the final tree.
+ */
+ SQFS_TREE_NO_SLINKS = 0x08,
+
+ /**
+ * @brief Omit empty directories from the final tree.
+ *
+ * If a directory is not empty on-disk, but ends up empty after
+ * applying all the other filter rules, it is also omitted.
+ */
+ SQFS_TREE_NO_EMPTY = 0x10,
+
+ /**
+ * @brief Do not recurse into sub directories.
+ *
+ * If the start node is a directory, the tree deserializer will still
+ * recurse into it, but it will not go beyond that.
+ */
+ SQFS_TREE_NO_RECURSE = 0x20,
+
+ /**
+ * @brief Store the list of parent nodes all the way to the target node
+ *
+ * When traversing towards the selected node, also collect the chain
+ * of parent nodes with the subtree stored at the end.
+ */
+ SQFS_TREE_STORE_PARENTS = 0x40,
+} E_SQFS_TREE_FILTER_FLAGS;
+
+/**
+ * @struct sqfs_tree_node_t
+ *
+ * @brief Encapsulates a node in the filesystem tree read by
+ * @ref sqfs_dir_reader_get_full_hierarchy.
+ */
+struct sqfs_tree_node_t {
+ /**
+ * @brief Pointer to parent, NULL for the root node
+ */
+ sqfs_tree_node_t *parent;
+
+ /**
+ * @brief For directories, a linked list of children.
+ */
+ sqfs_tree_node_t *children;
+
+ /**
+ * @brief Linked list next pointer for children list.
+ */
+ sqfs_tree_node_t *next;
+
+ /**
+ * @brief Inode representing this element in the tree.
+ */
+ sqfs_inode_generic_t *inode;
+
+ /**
+ * @brief Resolved 32 bit user ID from the inode
+ */
+ uint32_t uid;
+
+ /**
+ * @brief Resolved 32 bit group ID from the inode
+ */
+ uint32_t gid;
+
+ /**
+ * @brief null-terminated entry name.
+ */
+ uint8_t name[];
+};
+
#ifdef __cplusplus
extern "C" {
#endif
@@ -500,6 +589,41 @@ SQFS_API int sqfs_dir_reader_find_by_path(sqfs_dir_reader_t *rd,
const char *path,
sqfs_inode_generic_t **out);
+/**
+ * @brief High level helper function for deserializing the entire file system
+ * hierarchy into an in-memory tree structure.
+ *
+ * @memberof sqfs_dir_reader_t
+ *
+ * This function internally navigates to a specified inode using
+ * @ref sqfs_dir_reader_find_by_path and starting from that recursively
+ * deserializes the entire hierarchy into a tree structure holding all inodes.
+ *
+ * @param rd A pointer to a directory reader.
+ * @param path A path to resolve into an inode. Forward or backward slashes can
+ * be used to seperate path components. Resolving '.' or '..' is
+ * not supported. Can be set to NULL to get the root inode.
+ * @param flags A combination of @ref E_SQFS_TREE_FILTER_FLAGS flags.
+ * @param out Returns the top most tree node.
+ *
+ * @return Zero on success, an @ref E_SQFS_ERROR value on failure.
+ */
+SQFS_API int sqfs_dir_reader_get_full_hierarchy(sqfs_dir_reader_t *rd,
+ const sqfs_id_table_t *idtbl,
+ const char *path,
+ unsigned int flags,
+ sqfs_tree_node_t **out);
+
+/**
+ * @brief Recursively destroy a tree of @ref sqfs_tree_node_t nodes
+ *
+ * This function can be used to clean up after
+ * @ref sqfs_dir_reader_get_full_hierarchy.
+ *
+ * @param root A pointer to the root node.
+ */
+SQFS_API void sqfs_dir_tree_destroy(sqfs_tree_node_t *root);
+
#ifdef __cplusplus
}
#endif
diff --git a/include/sqfs/error.h b/include/sqfs/error.h
index ddfeadd..31ebb47 100644
--- a/include/sqfs/error.h
+++ b/include/sqfs/error.h
@@ -107,6 +107,8 @@ typedef enum {
SQFS_ERROR_NOT_DIR = -12,
SQFS_ERROR_NO_ENTRY = -13,
+
+ SQFS_ERROR_LINK_LOOP = -14,
} E_SQFS_ERROR;
#endif /* SQFS_ERROR_H */
diff --git a/include/sqfs/predef.h b/include/sqfs/predef.h
index 4041a57..c25a858 100644
--- a/include/sqfs/predef.h
+++ b/include/sqfs/predef.h
@@ -70,6 +70,7 @@ typedef struct sqfs_meta_writer_t sqfs_meta_writer_t;
typedef struct sqfs_xattr_reader_t sqfs_xattr_reader_t;
typedef struct sqfs_file_t sqfs_file_t;
typedef struct sqfs_sparse_map_t sqfs_sparse_map_t;
+typedef struct sqfs_tree_node_t sqfs_tree_node_t;
typedef struct sqfs_fragment_t sqfs_fragment_t;
typedef struct sqfs_dir_header_t sqfs_dir_header_t;