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Added support for full seek operations

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A rather involved upgrade for both files and directories, seek and
related functions are now completely supported:
- lfs_file_seek
- lfs_file_tell
- lfs_file_rewind
- lfs_file_size
- lfs_dir_seek
- lfs_dir_tell
- lfs_dir_rewind

This change also highlighted the concern that lfs_off_t is unsigned,
whereas off_t is traditionally signed. Unfortunately, lfs_off_t is
already used intensively through the codebase, so in focusing on
moving forward and avoiding getting bogged down by details, I'm going to
keep it as is and use the signed type lfs_soff_t where necessary.
This commit is contained in:
Christopher Haster
2017-04-22 23:11:13 -05:00
parent a1d8a76b36
commit ba8afb9d92
4 changed files with 449 additions and 14 deletions
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19
lfs.h
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@@ -40,6 +40,12 @@ enum lfs_open_flags {
LFS_O_SYNC = 0x200,
};
enum lfs_whence_flags {
LFS_SEEK_SET = 0,
LFS_SEEK_CUR = 1,
LFS_SEEK_END = 2,
};
// Configuration provided during initialization of the littlefs
struct lfs_config {
@@ -138,6 +144,9 @@ typedef struct lfs_dir {
lfs_block_t pair[2];
lfs_off_t off;
lfs_block_t head[2];
lfs_off_t pos;
struct lfs_disk_dir {
uint32_t rev;
lfs_size_t size;
@@ -146,7 +155,7 @@ typedef struct lfs_dir {
} lfs_dir_t;
typedef struct lfs_superblock {
lfs_block_t dir[2]; //TODO rm me?
lfs_block_t pair[2];
lfs_off_t off;
struct lfs_disk_superblock {
@@ -195,6 +204,9 @@ int lfs_mkdir(lfs_t *lfs, const char *path);
int lfs_dir_open(lfs_t *lfs, lfs_dir_t *dir, const char *path);
int lfs_dir_close(lfs_t *lfs, lfs_dir_t *dir);
int lfs_dir_read(lfs_t *lfs, lfs_dir_t *dir, struct lfs_info *info);
int lfs_dir_seek(lfs_t *lfs, lfs_dir_t *dir, lfs_off_t off);
lfs_soff_t lfs_dir_tell(lfs_t *lfs, lfs_dir_t *dir);
int lfs_dir_rewind(lfs_t *lfs, lfs_dir_t *dir);
int lfs_file_open(lfs_t *lfs, lfs_file_t *file,
const char *path, int flags);
@@ -204,6 +216,11 @@ lfs_ssize_t lfs_file_write(lfs_t *lfs, lfs_file_t *file,
const void *buffer, lfs_size_t size);
lfs_ssize_t lfs_file_read(lfs_t *lfs, lfs_file_t *file,
void *buffer, lfs_size_t size);
lfs_soff_t lfs_file_seek(lfs_t *lfs, lfs_file_t *file,
lfs_soff_t off, int whence);
lfs_soff_t lfs_file_size(lfs_t *lfs, lfs_file_t *file);
lfs_soff_t lfs_file_tell(lfs_t *lfs, lfs_file_t *file);
int lfs_file_rewind(lfs_t *lfs, lfs_file_t *file);
int lfs_deorphan(lfs_t *lfs);
int lfs_traverse(lfs_t *lfs, int (*cb)(void*, lfs_block_t), void *data);