/**
* efi_file_from_path() - open file via device path
*
* @fp: device path
* @return: EFI_FILE_PROTOCOL for the file or NULL
*/
struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp)
{
struct efi_simple_file_system_protocol *v;
struct efi_file_handle *f;
efi_status_t ret;
v = efi_fs_from_path(fp);
if (!v)
return NULL;
EFI_CALL(ret = v->open_volume(v, &f));
if (ret != EFI_SUCCESS)
return NULL;
/* Skip over device-path nodes before the file path. */
while (fp && !EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH))
fp = efi_dp_next(fp);
/*
* Step through the nodes of the directory path until the actual file
* node is reached which is the final node in the device path.
*/
while (fp) {
struct efi_device_path_file_path *fdp =
container_of(fp, struct efi_device_path_file_path, dp);
struct efi_file_handle *f2;
if (!EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH)) {
printf("bad file path!\n");
f->close(f);
return NULL;
}
EFI_CALL(ret = f->open(f, &f2, fdp->str,
EFI_FILE_MODE_READ, 0));
if (ret != EFI_SUCCESS)
return NULL;
fp = efi_dp_next(fp);
EFI_CALL(f->close(f));
f = f2;
}
return f;
}
struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp)
{
struct efi_simple_file_system_protocol *v;
struct efi_file_handle *f;
efi_status_t ret;
v = efi_fs_from_path(fp);
if (!v)
return NULL;
EFI_CALL(ret = v->open_volume(v, &f));
if (ret != EFI_SUCCESS)
return NULL;
/* skip over device-path nodes before the file path: */
while (fp && !EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH))
fp = efi_dp_next(fp);
while (fp) {
struct efi_device_path_file_path *fdp =
container_of(fp, struct efi_device_path_file_path, dp);
struct efi_file_handle *f2;
if (!EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH)) {
printf("bad file path!\n");
f->close(f);
return NULL;
}
EFI_CALL(ret = f->open(f, &f2, (s16 *)fdp->str,
EFI_FILE_MODE_READ, 0));
if (ret != EFI_SUCCESS)
return NULL;
fp = efi_dp_next(fp);
EFI_CALL(f->close(f));
f = f2;
}
return f;
}
