1 files changed, 88 insertions, 0 deletions
diff --git a/source3/lib/file_id.c b/source3/lib/file_id.c
new file mode 100644
index 0000000000..0633d4b88d
--- /dev/null
+++ b/source3/lib/file_id.c
@@ -0,0 +1,88 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   file_id structure handling
+
+   Copyright (C) Andrew Tridgell 2007
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+
+/*
+  return a file_id which gives a unique ID for a file given the device and
+  inode numbers
+ */
+struct file_id file_id_create_dev(SMB_DEV_T dev, SMB_INO_T inode)
+{
+	struct file_id key;
+	/* the ZERO_STRUCT ensures padding doesn't break using the key as a
+	 * blob */
+	ZERO_STRUCT(key);
+	key.devid = dev;
+	key.inode = inode;
+	return key;
+}
+
+/*
+  generate a file_id from a stat structure
+ */
+struct file_id vfs_file_id_from_sbuf(connection_struct *conn, const SMB_STRUCT_STAT *sbuf)
+{
+	return SMB_VFS_FILE_ID_CREATE(conn, sbuf->st_dev, sbuf->st_ino);
+}
+
+/*
+  return True if two file_id structures are equal
+ */
+bool file_id_equal(const struct file_id *id1, const struct file_id *id2)
+{
+	return id1->inode == id2->inode && id1->devid == id2->devid;
+}
+
+/*
+  a static string for a file_id structure
+ */
+const char *file_id_string_tos(const struct file_id *id)
+{
+	char *result = talloc_asprintf(talloc_tos(), "%llx:%llx", 
+				       (unsigned long long)id->devid, 
+				       (unsigned long long)id->inode);
+	SMB_ASSERT(result != NULL);
+	return result;
+}
+
+/*
+  push a 16 byte version of a file id into a buffer
+ */
+void push_file_id_16(char *buf, const struct file_id *id)
+{
+	SIVAL(buf,  0, id->devid&0xFFFFFFFF);
+	SIVAL(buf,  4, id->devid>>32);
+	SIVAL(buf,  8, id->inode&0xFFFFFFFF);
+	SIVAL(buf, 12, id->inode>>32);
+}
+
+/*
+  pul a 16 byte version of a file id from a buffer
+ */
+void pull_file_id_16(char *buf, struct file_id *id)
+{
+	ZERO_STRUCTP(id);
+	id->devid  = IVAL(buf,  0);
+	id->devid |= ((uint64_t)IVAL(buf,4))<<32;
+	id->inode  = IVAL(buf,  8);
+	id->inode |= ((uint64_t)IVAL(buf,12))<<32;
+}