static efi_status_t EFIAPI efi_file_write(struct efi_file_handle *file,
efi_uintn_t *buffer_size,
void *buffer)
{
struct file_handle *fh = to_fh(file);
efi_status_t ret = EFI_SUCCESS;
loff_t actwrite;
EFI_ENTRY("%p, %p, %p", file, buffer_size, buffer);
if (set_blk_dev(fh)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
if (fs_write(fh->path, (ulong)buffer, fh->offset, *buffer_size,
&actwrite)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
*buffer_size = actwrite;
fh->offset += actwrite;
error:
return EFI_EXIT(ret);
}
static efi_status_t EFIAPI efi_file_read(struct efi_file_handle *file,
efi_uintn_t *buffer_size, void *buffer)
{
struct file_handle *fh = to_fh(file);
efi_status_t ret = EFI_SUCCESS;
u64 bs;
EFI_ENTRY("%p, %p, %p", file, buffer_size, buffer);
if (!buffer_size || !buffer) {
ret = EFI_INVALID_PARAMETER;
goto error;
}
if (set_blk_dev(fh)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
bs = *buffer_size;
if (fh->isdir)
ret = dir_read(fh, &bs, buffer);
else
ret = file_read(fh, &bs, buffer);
if (bs <= SIZE_MAX)
*buffer_size = bs;
else
*buffer_size = SIZE_MAX;
error:
return EFI_EXIT(ret);
}
/* NOTE: despite what you would expect, 'file_name' is actually a path.
* With windoze style backlashes, ofc.
*/
static struct efi_file_handle *file_open(struct file_system *fs,
struct file_handle *parent, s16 *file_name, u64 mode)
{
struct file_handle *fh;
char f0[MAX_UTF8_PER_UTF16] = {0};
int plen = 0;
int flen = 0;
if (file_name) {
utf16_to_utf8((u8 *)f0, (u16 *)file_name, 1);
flen = utf16_strlen((u16 *)file_name);
}
/* we could have a parent, but also an absolute path: */
if (f0[0] == '\\') {
plen = 0;
} else if (parent) {
plen = strlen(parent->path) + 1;
}
/* +2 is for null and '/' */
fh = calloc(1, sizeof(*fh) + plen + (flen * MAX_UTF8_PER_UTF16) + 2);
fh->base = efi_file_handle_protocol;
fh->fs = fs;
if (parent) {
char *p = fh->path;
if (plen > 0) {
strcpy(p, parent->path);
p += plen - 1;
*p++ = '/';
}
utf16_to_utf8((u8 *)p, (u16 *)file_name, flen);
if (sanitize_path(fh->path))
goto error;
/* check if file exists: */
if (set_blk_dev(fh))
goto error;
if (!((mode & EFI_FILE_MODE_CREATE) || fs_exists(fh->path)))
goto error;
/* figure out if file is a directory: */
fh->isdir = is_dir(fh);
} else {
fh->isdir = 1;
strcpy(fh->path, "");
}
return &fh->base;
error:
free(fh);
return NULL;
}
static int is_dir(struct file_handle *fh)
{
struct fs_dir_stream *dirs;
set_blk_dev(fh);
dirs = fs_opendir(fh->path);
if (!dirs)
return 0;
fs_closedir(dirs);
return 1;
}
static efi_status_t EFIAPI efi_file_delete(struct efi_file_handle *file)
{
struct file_handle *fh = to_fh(file);
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p", file);
if (set_blk_dev(fh)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
if (fs_unlink(fh->path))
ret = EFI_DEVICE_ERROR;
file_close(fh);
error:
return EFI_EXIT(ret);
}
static efi_status_t EFIAPI efi_file_setpos(struct efi_file_handle *file,
efi_uintn_t pos)
{
struct file_handle *fh = to_fh(file);
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p, %zu", file, pos);
if (fh->isdir) {
if (pos != 0) {
ret = EFI_UNSUPPORTED;
goto error;
}
fs_closedir(fh->dirs);
fh->dirs = NULL;
}
if (pos == ~0ULL) {
loff_t file_size;
if (set_blk_dev(fh)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
if (fs_size(fh->path, &file_size)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
pos = file_size;
}
fh->offset = pos;
error:
return EFI_EXIT(ret);
}
static efi_status_t EFIAPI efi_file_getinfo(struct efi_file_handle *file,
const efi_guid_t *info_type,
efi_uintn_t *buffer_size,
void *buffer)
{
struct file_handle *fh = to_fh(file);
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p, %p, %p, %p", file, info_type, buffer_size, buffer);
if (!guidcmp(info_type, &efi_file_info_guid)) {
struct efi_file_info *info = buffer;
char *filename = basename(fh);
unsigned int required_size;
loff_t file_size;
/* check buffer size: */
required_size = sizeof(*info) + 2 * (strlen(filename) + 1);
if (*buffer_size < required_size) {
*buffer_size = required_size;
ret = EFI_BUFFER_TOO_SMALL;
goto error;
}
if (set_blk_dev(fh)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
if (fs_size(fh->path, &file_size)) {
ret = EFI_DEVICE_ERROR;
goto error;
}
memset(info, 0, required_size);
info->size = required_size;
info->file_size = file_size;
info->physical_size = file_size;
if (fh->isdir)
info->attribute |= EFI_FILE_DIRECTORY;
ascii2unicode((u16 *)info->file_name, filename);
} else if (!guidcmp(info_type, &efi_file_system_info_guid)) {
struct efi_file_system_info *info = buffer;
disk_partition_t part;
efi_uintn_t required_size;
int r;
if (fh->fs->part >= 1)
r = part_get_info(fh->fs->desc, fh->fs->part, &part);
else
r = part_get_info_whole_disk(fh->fs->desc, &part);
if (r < 0) {
ret = EFI_DEVICE_ERROR;
goto error;
}
required_size = sizeof(info) + 2 *
(strlen((const char *)part.name) + 1);
if (*buffer_size < required_size) {
*buffer_size = required_size;
ret = EFI_BUFFER_TOO_SMALL;
goto error;
}
memset(info, 0, required_size);
info->size = required_size;
info->read_only = true;
info->volume_size = part.size * part.blksz;
info->free_space = 0;
info->block_size = part.blksz;
/*
* TODO: The volume label is not available in U-Boot.
* Use the partition name as substitute.
*/
ascii2unicode((u16 *)info->volume_label,
(const char *)part.name);
} else {
ret = EFI_UNSUPPORTED;
}
error:
return EFI_EXIT(ret);
}