From: Carl Hetherington <cth@carlh.net>
Date: Thu, 12 Jan 2017 13:45:04 +0000 (+0000)
Subject: Add call to set up the partition offset for filedev.
X-Git-Url: https://git.carlh.net/gitweb/?a=commitdiff_plain;h=3902d297cd3bbb1c2a0a1fc790454a9a60bc606a;p=lwext4.git

Add call to set up the partition offset for filedev.
---

diff --git a/blockdev/linux/ext4_filedev.c b/blockdev/linux/ext4_filedev.c
index d441799..864e6c6 100644
--- a/blockdev/linux/ext4_filedev.c
+++ b/blockdev/linux/ext4_filedev.c
@@ -38,6 +38,7 @@
 
 /**@brief   Default filename.*/
 static const char *fname = "ext2";
+static uint64_t offset = 0;
 
 /**@brief   Image block size.*/
 #define EXT4_FILEDEV_BSIZE 512
@@ -73,8 +74,8 @@ static int filedev_open(struct ext4_blockdev *bdev)
 	if (fseeko(dev_file, 0, SEEK_END))
 		return EFAULT;
 
-	_filedev.part_offset = 0;
-	_filedev.part_size = ftello(dev_file);
+	_filedev.part_offset = offset;
+	_filedev.part_size = ftello(dev_file) - offset;
 	_filedev.bdif->ph_bcnt = _filedev.part_size / _filedev.bdif->ph_bsize;
 
 	return EOK;
@@ -133,5 +134,6 @@ static int filedev_close(struct ext4_blockdev *bdev)
 struct ext4_blockdev *ext4_filedev_get(void) { return &_filedev; }
 /******************************************************************************/
 void ext4_filedev_filename(const char *n) { fname = n; }
+void ext4_filedev_offset(uint64_t o) { offset = o; }
 
 /******************************************************************************/
diff --git a/blockdev/linux/ext4_filedev.h b/blockdev/linux/ext4_filedev.h
index 8f13d9a..ce3ecdd 100644
--- a/blockdev/linux/ext4_filedev.h
+++ b/blockdev/linux/ext4_filedev.h
@@ -39,5 +39,7 @@ struct ext4_blockdev *ext4_filedev_get(void);
 
 /**@brief   Set filename to open.*/
 void ext4_filedev_filename(const char *n);
+/**@brief   Set offset to work at within file (in bytes) */
+void ext4_filedev_offset(uint64_t o);
 
 #endif /* EXT4_FILEDEV_H_ */