Changeset 97bc3ee in mainline for uspace/srv/fs/fat/fat_fat.h

Timestamp:

2011-04-09T19:23:12Z (14 years ago)

Author:

Oleg Romanenko <romanenko.oleg@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d260a95

Parents:

fc35e98

Message:

Full support for FAT12 file system. Correct creating directories and files. Fixing addressing issue.
Type of FAT (12,16,32) is determined only on the basis of the count of clusters(according to Microsoft FAT specification). I.e. FAT
with 4085 clusters or less will be determined as FAT12. FAT16 must contain more than 4085 clusters but less then 65525.

File:

• uspace/srv/fs/fat/fat_fat.h (modified) (2 diffs)

uspace/srv/fs/fat/fat_fat.h

@@ -29 +29 @@
 /** @addtogroup fs
  * @{
- */ 
+ */
 
 #ifndef FAT_FAT_FAT_H_
@@ -56 +56 @@
 #define FAT_CLST_ROOT           FAT_CLST_RES1
 
-#define FATTYPE(bs)      (bs)->reserved
+/*
+ * Convenience macros for computing some frequently used values from the
+ * primitive boot sector members.
+ */
+#define RDS(bs)         ((sizeof(fat_dentry_t) * RDE((bs))) / BPS((bs))) + \
+                        (((sizeof(fat_dentry_t) * RDE((bs))) % BPS((bs))) != 0)
+#define SSA(bs)         (RSCNT((bs)) + FATCNT((bs)) * SF((bs)) + RDS(bs))
+#define DS(bs)          (TS(bs) - SSA(bs))
+#define CC(bs)          (DS(bs) / SPC(bs))
+#define FATTYPE(bs)     (bs)->reserved
 
 /* forward declarations */