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fs: Create functions to load and allocate a file

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This functionality current sits in bootstd, but it is more generally
useful. Add a function to load a file into memory, allocating it as
needed. Adjust bootstd to use this version.

Note: Tests are added in the subsequent patch which converts the 'cat'
command to use this function.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2023-06-01 10:22:38 -06:00
committed by Tom Rini
parent 5904d953a1
commit de7b5a8a1a
3 changed files with 98 additions and 28 deletions
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38
include/fs.h
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@@ -300,4 +300,42 @@ int do_fs_type(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
*/
int do_fs_types(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]);
/**
* fs_read_alloc() - Allocate space for a file and read it
*
* You must call fs_set_blk_dev() or a similar function before calling this,
* since that sets up the block device to use.
*
* The file is terminated with a nul character
*
* @fname: Filename to read
* @size: Size of file to read (must be correct!)
* @align: Alignment to use for memory allocation (0 for default)
* @bufp: On success, returns the allocated buffer with the nul-terminated file
* in it
* Return: 0 if OK, -ENOMEM if out of memory, -EIO if read failed
*/
int fs_read_alloc(const char *fname, ulong size, uint align, void **bufp);
/**
* fs_load_alloc() - Load a file into allocated space
*
* The file is terminated with a nul character
*
* @ifname: Interface name to read from (e.g. "mmc")
* @dev_part_str: Device and partition string (e.g. "1:2")
* @fname: Filename to read
* @max_size: Maximum allowed size for the file (use 0 for 1GB)
* @align: Alignment to use for memory allocation (0 for default)
* @bufp: On success, returns the allocated buffer with the nul-terminated file
* in it
* @sizep: On success, returns the size of the file
* Return: 0 if OK, -ENOMEM if out of memory, -ENOENT if the file does not
* exist, -ENOMEDIUM if the device does not exist, -E2BIG if the file is too
* large (greater than @max_size), -EIO if read failed
*/
int fs_load_alloc(const char *ifname, const char *dev_part_str,
const char *fname, ulong max_size, ulong align, void **bufp,
ulong *sizep);
#endif /* _FS_H */