Add helper function to turn sqfs inode into struct stat

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

3 files changed, 82 insertions, 0 deletions

diff --git a/include/highlevel.h b/include/highlevel.h
index 8173d6f..1c1ea11 100644
--- a/include/highlevel.h
+++ b/include/highlevel.h
@@ -22,6 +22,7 @@
 #include "data_writer.h"
 #include "fstree.h"
 
+#include <sys/stat.h>
 #include <stdint.h>
 #include <stddef.h>
 
@@ -120,4 +121,6 @@ int xattr_reader_restore_node(sqfs_xattr_reader_t *xr, fstree_t *fs,
 sqfs_inode_generic_t *tree_node_to_inode(fstree_t *fs, sqfs_id_table_t *idtbl,
 					 tree_node_t *node);
 
+int inode_stat(const sqfs_tree_node_t *node, struct stat *sb);
+
 #endif /* HIGHLEVEL_H */
diff --git a/lib/sqfshelper/Makemodule.am b/lib/sqfshelper/Makemodule.am
index 623b2b0..32d9852 100644
--- a/lib/sqfshelper/Makemodule.am
+++ b/lib/sqfshelper/Makemodule.am
@@ -7,6 +7,7 @@ libsqfshelper_a_SOURCES += lib/sqfshelper/tree_node_to_inode.c
 libsqfshelper_a_SOURCES += lib/sqfshelper/write_export_table.c
 libsqfshelper_a_SOURCES += lib/sqfshelper/print_version.c
 libsqfshelper_a_SOURCES += lib/sqfshelper/xattr_reader.c
+libsqfshelper_a_SOURCES += lib/sqfshelper/inode_stat.c
 libsqfshelper_a_SOURCES += lib/sqfshelper/compress.c lib/sqfshelper/comp_opt.c
 libsqfshelper_a_SOURCES += include/data_reader.h lib/sqfshelper/data_reader.c
 libsqfshelper_a_SOURCES += include/data_writer.h lib/sqfshelper/data_writer.c
diff --git a/lib/sqfshelper/inode_stat.c b/lib/sqfshelper/inode_stat.c
new file mode 100644
index 0000000..67ff764
--- /dev/null
+++ b/lib/sqfshelper/inode_stat.c
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * inode_stat.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "highlevel.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+int inode_stat(const sqfs_tree_node_t *node, struct stat *sb)
+{
+	memset(sb, 0, sizeof(*sb));
+
+	sb->st_mode = node->inode->base.mode;
+	sb->st_uid = node->uid;
+	sb->st_gid = node->gid;
+	sb->st_atime = node->inode->base.mod_time;
+	sb->st_mtime = node->inode->base.mod_time;
+	sb->st_ctime = node->inode->base.mod_time;
+	sb->st_ino = node->inode->base.inode_number;
+	sb->st_nlink = 1;
+	sb->st_blksize = 512;
+
+	switch (node->inode->base.type) {
+	case SQFS_INODE_BDEV:
+	case SQFS_INODE_CDEV:
+		sb->st_rdev = node->inode->data.dev.devno;
+		sb->st_nlink = node->inode->data.dev.nlink;
+		break;
+	case SQFS_INODE_EXT_BDEV:
+	case SQFS_INODE_EXT_CDEV:
+		sb->st_rdev = node->inode->data.dev_ext.devno;
+		sb->st_nlink = node->inode->data.dev_ext.nlink;
+		break;
+	case SQFS_INODE_FIFO:
+	case SQFS_INODE_SOCKET:
+		sb->st_nlink = node->inode->data.ipc.nlink;
+		break;
+	case SQFS_INODE_EXT_FIFO:
+	case SQFS_INODE_EXT_SOCKET:
+		sb->st_nlink = node->inode->data.ipc_ext.nlink;
+		break;
+	case SQFS_INODE_SLINK:
+		sb->st_size = node->inode->data.slink.target_size;
+		sb->st_nlink = node->inode->data.slink.nlink;
+		break;
+	case SQFS_INODE_EXT_SLINK:
+		sb->st_size = node->inode->data.slink_ext.target_size;
+		sb->st_nlink = node->inode->data.slink_ext.nlink;
+		break;
+	case SQFS_INODE_FILE:
+		sb->st_size = node->inode->data.file.file_size;
+		break;
+	case SQFS_INODE_EXT_FILE:
+		sb->st_size = node->inode->data.file_ext.file_size;
+		sb->st_nlink = node->inode->data.file_ext.nlink;
+		break;
+	case SQFS_INODE_DIR:
+		sb->st_size = node->inode->data.dir.size;
+		sb->st_nlink = node->inode->data.dir.nlink;
+		break;
+	case SQFS_INODE_EXT_DIR:
+		sb->st_size = node->inode->data.dir_ext.size;
+		sb->st_nlink = node->inode->data.dir_ext.nlink;
+		break;
+	}
+
+	sb->st_blocks = sb->st_size / sb->st_blksize;
+	if (sb->st_size % sb->st_blksize)
+		sb->st_blocks += 1;
+
+	return 0;
+}