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fs/fat/fs_fat32.[c|h]: fix fseek bug when file size is multiple of cluster size

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Unbinding `ff_currentcluster` and `f_pos`:
1. Added `ff_pos` in `struct fat_file_s`.
2. Added function `fat_zero_cluster` for doing zeroing for gap
   between EOF and new position beyond EOF.
3. Added function `fat_get_sectors` for getting the sector where
   `f_pos` is located, allocting new cluster when `f_pos` is beyond
   EOF.
4. Modify function `fat_read`, and `fat_write` with above functions.
5. Remove redundant logics in `fat_seek` since now new cluster is
   allocated when writing instead of seeking.

Signed-off-by: Yinzhe Wu <Yinzhe.Wu@sony.com>
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Jacky Cao <Jacky.Cao@sony.com>
Tested-by: Yinzhe Wu <Yinzhe.Wu@sony.com>
This commit is contained in:
Windrow14
2024-07-04 10:22:00 +08:00
committed by Xiang Xiao
parent cef9addbbb
commit 479c393291
2 changed files with 296 additions and 255 deletions
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fs/fat/fs_fat32.c
+295 -255
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fs/fat/fs_fat32.h
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@@ -907,6 +907,7 @@ struct fat_file_s
off_t ff_startcluster; /* Start cluster of file on media */
off_t ff_currentsector; /* Current sector being operated on */
off_t ff_cachesector; /* Current sector in the file buffer */
off_t ff_pos; /* Current position in the file */
uint8_t *ff_buffer; /* File buffer (for partial sector accesses) */
};