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- erratic reading caused by using absolute instead of relative position, fixed

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This commit is contained in:
Wiesner András 2023-11-11 20:27:52 +01:00
parent bcd655fd8d
commit 9363db67f8
1 changed files with 2 additions and 2 deletions
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4
fs/fat32/fat32.c
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@ -487,7 +487,7 @@ uint32_t fat32_read_file_random_access(const Fat32_CtrlBlock *ctrl, const Fat32_
// reading from a file may involve reading across cluster boundaries // reading from a file may involve reading across cluster boundaries
// 1. read the beginning from the first cluster // 1. read the beginning from the first cluster
uint32_t first_read_len = MIN(read_len, ctrl->bytes_per_sector - pos); uint32_t first_read_len = MIN(read_len, ctrl->bytes_per_sector - pos_in_sector);
memcpy(p, buffer + pos_in_sector, first_read_len); memcpy(p, buffer + pos_in_sector, first_read_len);
read_len -= first_read_len; // decrease the total read len with the number of bytes read from the first sector of the file read_len -= first_read_len; // decrease the total read len with the number of bytes read from the first sector of the file
offset += first_read_len; // advance offset offset += first_read_len; // advance offset
@ -619,7 +619,7 @@ uint32_t fat32_read_file_stream(const Fat32_CtrlBlock *ctrl, Fat32_FileHelper *f
// reading from a file may involve reading across cluster boundaries // reading from a file may involve reading across cluster boundaries
// 1. read the beginning from the first cluster // 1. read the beginning from the first cluster
uint32_t first_read_len = MIN(read_len, ctrl->bytes_per_sector - seek_hint->pos); uint32_t first_read_len = MIN(read_len, ctrl->bytes_per_sector - pos_in_sector);
memcpy(p, buffer + pos_in_sector, first_read_len); memcpy(p, buffer + pos_in_sector, first_read_len);
read_len -= first_read_len; // decrease the total read len with the number of bytes read from the first sector of the file read_len -= first_read_len; // decrease the total read len with the number of bytes read from the first sector of the file
offset += first_read_len; // advance offset offset += first_read_len; // advance offset