From f780c9542d2c96cb0ae00a8de8d67b9a8fd278cd Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Tue, 3 Sep 2019 12:54:15 +0200
Subject: Add fstree independend directory writer to libsquashfs.so

This commit adds a directory writer to libsquashfs that wrapps a meta
data writer and provides a higher-level interface for writing directory
entries. Under the hood it enforces the rules that squashfs insists
upon.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 include/highlevel.h | 29 ++---------------------------
 include/sqfs/dir.h  | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 27 deletions(-)

(limited to 'include')

diff --git a/include/highlevel.h b/include/highlevel.h
index ef10c1e..576f686 100644
--- a/include/highlevel.h
+++ b/include/highlevel.h
@@ -16,24 +16,13 @@
 #include "sqfs/table.h"
 #include "sqfs/meta_writer.h"
 #include "sqfs/xattr.h"
+#include "sqfs/dir.h"
 #include "data_reader.h"
 #include "fstree.h"
 
 #include <stdint.h>
 #include <stddef.h>
 
-typedef struct {
-	tree_node_t *node;
-	uint32_t block;
-	uint32_t index;
-} idx_ref_t;
-
-typedef struct {
-	size_t num_nodes;
-	size_t max_nodes;
-	idx_ref_t idx_nodes[];
-} dir_index_t;
-
 typedef struct {
 	compressor_t *cmp;
 	data_reader_t *data;
@@ -114,20 +103,6 @@ int sqfs_reader_open(sqfs_reader_t *rd, const char *filename,
 /* Cleanup after a successfull sqfs_reader_open */
 void sqfs_reader_close(sqfs_reader_t *rd);
 
-/*
-  High level helper function that writes squashfs directory entries to
-  a meta data writer.
-
-  The dir_info_t structure is used to generate the listing and updated
-  accordingly (such as writing back the header position and total size).
-  A directory index is created on the fly and returned in *index.
-  A single free() call is sufficient.
-
-  Returns 0 on success. Prints error messages to stderr on failure.
- */
-int meta_writer_write_dir(meta_writer_t *dm, dir_info_t *dir,
-			  dir_index_t **index);
-
 /*
   High level helper function to serialize a tree_node_t to a squashfs inode
   and write it to a meta data writer.
@@ -140,7 +115,7 @@ int meta_writer_write_dir(meta_writer_t *dm, dir_info_t *dir,
   Returns 0 on success. Prints error messages to stderr on failure.
  */
 int meta_writer_write_inode(fstree_t *fs, id_table_t *idtbl, meta_writer_t *im,
-			    meta_writer_t *dm, tree_node_t *node);
+			    sqfs_dir_writer_t *dirw, tree_node_t *node);
 
 void compressor_print_available(void);
 
diff --git a/include/sqfs/dir.h b/include/sqfs/dir.h
index 5c822f1..818ca87 100644
--- a/include/sqfs/dir.h
+++ b/include/sqfs/dir.h
@@ -10,6 +10,7 @@
 #include "config.h"
 
 #include "sqfs/meta_reader.h"
+#include "sqfs/meta_writer.h"
 
 #include <stdint.h>
 
@@ -36,6 +37,8 @@ typedef struct {
 	uint8_t name[];
 } sqfs_dir_index_t;
 
+typedef struct sqfs_dir_writer_t sqfs_dir_writer_t;
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -47,6 +50,27 @@ int meta_reader_read_dir_header(meta_reader_t *m, sqfs_dir_header_t *hdr);
    The function internally prints to stderr on failure */
 sqfs_dir_entry_t *meta_reader_read_dir_ent(meta_reader_t *m);
 
+sqfs_dir_writer_t *sqfs_dir_writer_create(meta_writer_t *dm);
+
+void sqfs_dir_writer_destroy(sqfs_dir_writer_t *writer);
+
+int sqfs_dir_writer_begin(sqfs_dir_writer_t *writer);
+
+int sqfs_dir_writer_add_entry(sqfs_dir_writer_t *writer, const char *name,
+			      uint32_t inode_num, uint64_t inode_ref,
+			      mode_t mode);
+
+int sqfs_dir_writer_end(sqfs_dir_writer_t *writer);
+
+size_t sqfs_dir_writer_get_size(sqfs_dir_writer_t *writer);
+
+uint64_t sqfs_dir_writer_get_dir_reference(sqfs_dir_writer_t *writer);
+
+size_t sqfs_dir_writer_get_index_size(sqfs_dir_writer_t *writer);
+
+int sqfs_dir_writer_write_index(sqfs_dir_writer_t *writer,
+				meta_writer_t *im);
+
 #ifdef __cplusplus
 }
 #endif
-- 
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