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//! Generic CFDP type-length-value (TLV) abstraction as specified in CFDP 5.1.9.
use crate::cfdp::lv::{
generic_len_check_data_serialization, generic_len_check_deserialization, Lv, MIN_LV_LEN,
};
use crate::cfdp::TlvLvError;
use crate::util::{UnsignedByteField, UnsignedByteFieldError, UnsignedEnum};
use crate::ByteConversionError;
#[cfg(feature = "alloc")]
use alloc::vec;
use alloc::vec::Vec;
pub use alloc_mod::*;
use num_enum::{IntoPrimitive, TryFromPrimitive};
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
use super::TlvLvDataTooLarge;
pub mod msg_to_user;
pub const MIN_TLV_LEN: usize = 2;
pub trait GenericTlv {
fn tlv_type_field(&self) -> TlvTypeField;
/// Checks whether the type field contains one of the standard types specified in the CFDP
/// standard and is part of the [TlvType] enum.
fn is_standard_tlv(&self) -> bool {
if let TlvTypeField::Standard(_) = self.tlv_type_field() {
return true;
}
false
/// Returns the standard TLV type if the TLV field is not a custom field
fn tlv_type(&self) -> Option<TlvType> {
if let TlvTypeField::Standard(tlv_type) = self.tlv_type_field() {
Some(tlv_type)
} else {
None
pub trait ReadableTlv {
fn value(&self) -> &[u8];
/// Checks whether the value field is empty.
fn is_empty(&self) -> bool {
self.value().is_empty()
/// Helper method to retrieve the length of the value. Simply calls the [slice::len] method of
/// [Self::value]
fn len_value(&self) -> usize {
self.value().len()
/// Returns the full raw length, including the length byte.
fn len_full(&self) -> usize {
self.len_value() + 2
pub trait WritableTlv {
fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, ByteConversionError>;
fn len_written(&self) -> usize;
fn to_vec(&self) -> Vec<u8> {
let mut buf = vec![0; self.len_written()];
self.write_to_bytes(&mut buf).unwrap();
buf
#[derive(Debug, Copy, Clone, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(u8)]
pub enum TlvType {
FilestoreRequest = 0x00,
FilestoreResponse = 0x01,
MsgToUser = 0x02,
FaultHandler = 0x04,
FlowLabel = 0x05,
EntityId = 0x06,
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum TlvTypeField {
Standard(TlvType),
Custom(u8),
pub enum FilestoreActionCode {
CreateFile = 0b0000,
DeleteFile = 0b0001,
RenameFile = 0b0010,
/// This operation appends one file to another. The first specified name will form the first
/// part of the new file and the name of the new file. This function can be used to get
/// similar functionality to the UNIX cat utility (albeit for only two files).
AppendFile = 0b0011,
/// This operation replaces the content of the first specified file with the content of
/// the secondly specified file.
ReplaceFile = 0b0100,
CreateDirectory = 0b0101,
RemoveDirectory = 0b0110,
DenyFile = 0b0111,
DenyDirectory = 0b1000,
impl From<u8> for TlvTypeField {
fn from(value: u8) -> Self {
match TlvType::try_from(value) {
Ok(tlv_type) => TlvTypeField::Standard(tlv_type),
Err(_) => TlvTypeField::Custom(value),
impl From<TlvTypeField> for u8 {
fn from(value: TlvTypeField) -> Self {
match value {
TlvTypeField::Standard(std) => std as u8,
TlvTypeField::Custom(custom) => custom,
/// Generic CFDP type-length-value (TLV) abstraction as specified in CFDP 5.1.9.
///
/// Please note that this class is zero-copy and does not generate a copy of the value data for
/// both the regular [Self::new] constructor and the [Self::from_bytes] constructor.
/// # Lifetimes
/// * `data`: If the TLV is generated from a raw bytestream, this will be the lifetime of
/// the raw bytestream. If the TLV is generated from a raw slice or a similar data reference,
/// this will be the lifetime of that data reference.
pub struct Tlv<'data> {
tlv_type_field: TlvTypeField,
#[cfg_attr(feature = "serde", serde(borrow))]
lv: Lv<'data>,
impl<'data> Tlv<'data> {
pub fn new(tlv_type: TlvType, data: &[u8]) -> Result<Tlv, TlvLvDataTooLarge> {
Ok(Tlv {
tlv_type_field: TlvTypeField::Standard(tlv_type),
lv: Lv::new(data)?,
})
pub fn new_with_custom_type(tlv_type: u8, data: &[u8]) -> Result<Tlv, TlvLvDataTooLarge> {
tlv_type_field: TlvTypeField::Custom(tlv_type),
/// Creates a TLV with an empty value field.
pub fn new_empty(tlv_type: TlvType) -> Tlv<'data> {
Tlv {
lv: Lv::new_empty(),
/// Creates a TLV give a raw bytestream. Please note that is is not necessary to pass the
/// bytestream with the exact size of the expected TLV. This function will take care
/// of parsing the length byte, and the length of the parsed TLV can be retrieved using
/// [Self::len_full].
pub fn from_bytes(buf: &'data [u8]) -> Result<Tlv<'data>, TlvLvError> {
generic_len_check_deserialization(buf, MIN_TLV_LEN)?;
let mut tlv = Self {
tlv_type_field: TlvTypeField::from(buf[0]),
lv: Lv::from_bytes(&buf[MIN_LV_LEN..])?,
// We re-use this field so we do not need an additional struct field to store the raw start
// of the TLV.
tlv.lv.raw_data = Some(buf);
Ok(tlv)
/// If the TLV was generated from a raw bytestream using [Self::from_bytes], the raw start
/// of the TLV can be retrieved with this method.
pub fn raw_data(&self) -> Option<&[u8]> {
self.lv.raw_data()
pub fn to_owned(&self) -> TlvOwned {
TlvOwned {
tlv_type_field: self.tlv_type_field,
data: self.value().to_vec(),
impl PartialEq<TlvOwned> for Tlv<'_> {
fn eq(&self, other: &TlvOwned) -> bool {
self.tlv_type_field == other.tlv_type_field && self.value() == other.value()
impl ReadableTlv for Tlv<'_> {
fn value(&self) -> &[u8] {
self.lv.value()
impl WritableTlv for Tlv<'_> {
fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, ByteConversionError> {
generic_len_check_data_serialization(buf, self.value().len(), MIN_TLV_LEN)?;
buf[0] = self.tlv_type_field.into();
self.lv.write_to_be_bytes_no_len_check(&mut buf[1..]);
Ok(self.len_full())
fn len_written(&self) -> usize {
self.len_full()
impl GenericTlv for Tlv<'_> {
fn tlv_type_field(&self) -> TlvTypeField {
self.tlv_type_field
pub mod alloc_mod {
use crate::cfdp::TlvLvDataTooLarge;
use super::*;
/// Owned variant of [Tlv] which is consequently [Clone]able and does not have a lifetime
/// associated to a data slice.
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct TlvOwned {
pub(crate) tlv_type_field: TlvTypeField,
pub(crate) data: Vec<u8>,
impl TlvOwned {
pub fn new(tlv_type: TlvType, data: &[u8]) -> Result<Self, TlvLvDataTooLarge> {
if data.len() > u8::MAX as usize {
return Err(TlvLvDataTooLarge(data.len()));
Ok(Self {
data: data.to_vec(),
pub fn new_with_custom_type(tlv_type: u8, data: &[u8]) -> Result<Self, TlvLvDataTooLarge> {
pub fn new_empty(tlv_type: TlvType) -> Self {
Self {
data: Vec::new(),
pub fn as_tlv(&self) -> Tlv<'_> {
// The API should ensure that the data length is never to large, so the unwrap for the
// LV creation should never be an issue.
lv: Lv::new(&self.data).expect("lv creation failed unexpectedly"),
impl ReadableTlv for TlvOwned {
&self.data
impl WritableTlv for TlvOwned {
generic_len_check_data_serialization(buf, self.data.len(), MIN_TLV_LEN)?;
buf[1] = self.data.len() as u8;
buf[2..2 + self.data.len()].copy_from_slice(&self.data);
Ok(self.len_written())
self.data.len() + 2
impl GenericTlv for TlvOwned {
impl From<Tlv<'_>> for TlvOwned {
fn from(value: Tlv<'_>) -> Self {
value.to_owned()
impl PartialEq<Tlv<'_>> for TlvOwned {
fn eq(&self, other: &Tlv) -> bool {
self.tlv_type_field == other.tlv_type_field && self.data == other.value()
pub struct EntityIdTlv {
entity_id: UnsignedByteField,
impl EntityIdTlv {
pub fn new(entity_id: UnsignedByteField) -> Self {
Self { entity_id }
fn check_min_len(buf: &[u8]) -> Result<(), ByteConversionError> {
if buf.len() < 2 {
return Err(ByteConversionError::ToSliceTooSmall {
found: buf.len(),
expected: 2,
});
Ok(())
pub fn entity_id(&self) -> &UnsignedByteField {
&self.entity_id
pub fn len_value(&self) -> usize {
self.entity_id.size()
pub fn len_full(&self) -> usize {
2 + self.entity_id.size()
pub fn from_bytes(buf: &[u8]) -> Result<Self, TlvLvError> {
Self::check_min_len(buf)?;
verify_tlv_type(buf[0], TlvType::EntityId)?;
let len = buf[1];
if len != 1 && len != 2 && len != 4 && len != 8 {
return Err(TlvLvError::InvalidValueLength(len as usize));
// Okay to unwrap here. The checks before make sure that the deserialization never fails
let entity_id = UnsignedByteField::new_from_be_bytes(len as usize, &buf[2..]).unwrap();
Ok(Self { entity_id })
/// Convert to a generic [Tlv], which also erases the type information.
pub fn to_tlv(self, buf: &mut [u8]) -> Result<Tlv, ByteConversionError> {
self.entity_id
.write_to_be_bytes(&mut buf[2..2 + self.entity_id.size()])?;
if buf.len() < self.len_value() {
expected: self.len_value(),
// We performed all checks necessary to ensure this call never panics.
Ok(Tlv::new(TlvType::EntityId, &buf[2..2 + self.entity_id.size()]).unwrap())
// Unwrap is okay here, entity ID should never be larger than maximum allowed size.
TlvOwned::new(TlvType::EntityId, &self.entity_id.to_vec()).unwrap()
impl WritableTlv for EntityIdTlv {
buf[0] = TlvType::EntityId as u8;
buf[1] = self.entity_id.size() as u8;
Ok(2 + self.entity_id.write_to_be_bytes(&mut buf[2..])?)
impl GenericTlv for EntityIdTlv {
TlvTypeField::Standard(TlvType::EntityId)
impl<'data> TryFrom<Tlv<'data>> for EntityIdTlv {
type Error = TlvLvError;
fn try_from(value: Tlv) -> Result<Self, Self::Error> {
match value.tlv_type_field {
TlvTypeField::Standard(tlv_type) => {
if tlv_type != TlvType::EntityId {
return Err(TlvLvError::InvalidTlvTypeField {
found: tlv_type as u8,
expected: Some(TlvType::EntityId as u8),
TlvTypeField::Custom(val) => {
found: val,
let len_value = value.value().len();
if len_value != 1 && len_value != 2 && len_value != 4 && len_value != 8 {
return Err(TlvLvError::InvalidValueLength(len_value));
Ok(Self::new(
UnsignedByteField::new_from_be_bytes(len_value, value.value()).map_err(
|e| match e {
UnsignedByteFieldError::ByteConversionError(e) => e,
// This can not happen, we checked for the length validity, and the data is always smaller than
// 255 bytes.
_ => panic!("unexpected error"),
},
)?,
))
pub fn fs_request_has_second_filename(action_code: FilestoreActionCode) -> bool {
if action_code == FilestoreActionCode::RenameFile
|| action_code == FilestoreActionCode::AppendFile
|| action_code == FilestoreActionCode::ReplaceFile
{
struct FilestoreTlvBase<'first_name, 'second_name> {
pub action_code: FilestoreActionCode,
pub first_name: Lv<'first_name>,
pub second_name: Option<Lv<'second_name>>,
impl FilestoreTlvBase<'_, '_> {
fn base_len_value(&self) -> usize {
let mut len = 1 + self.first_name.len_full();
if let Some(second_name) = self.second_name {
len += second_name.len_full();
len
pub struct FilestoreRequestTlv<'first_name, 'second_name> {
base: FilestoreTlvBase<'first_name, 'second_name>,
impl<'first_name, 'second_name> FilestoreRequestTlv<'first_name, 'second_name> {
pub fn new_create_file(file_name: Lv<'first_name>) -> Result<Self, TlvLvError> {
Self::new(FilestoreActionCode::CreateFile, file_name, None)
pub fn new_delete_file(file_name: Lv<'first_name>) -> Result<Self, TlvLvError> {
Self::new(FilestoreActionCode::DeleteFile, file_name, None)
pub fn new_rename_file(
source_name: Lv<'first_name>,
target_name: Lv<'second_name>,
) -> Result<Self, TlvLvError> {
Self::new(
FilestoreActionCode::RenameFile,
source_name,
Some(target_name),
)
pub fn new_append_file(
first_file: Lv<'first_name>,
second_file: Lv<'second_name>,
FilestoreActionCode::AppendFile,
first_file,
Some(second_file),
/// the secondly specified file. This function can be used to get similar functionality to
/// the UNIX copy (cp) utility if the target file already exists.
pub fn new_replace_file(
replaced_file: Lv<'first_name>,
new_file: Lv<'second_name>,
FilestoreActionCode::ReplaceFile,
replaced_file,
Some(new_file),
pub fn new_create_directory(dir_name: Lv<'first_name>) -> Result<Self, TlvLvError> {
Self::new(FilestoreActionCode::CreateDirectory, dir_name, None)
pub fn new_remove_directory(dir_name: Lv<'first_name>) -> Result<Self, TlvLvError> {
Self::new(FilestoreActionCode::RemoveDirectory, dir_name, None)
pub fn new_deny_file(file_name: Lv<'first_name>) -> Result<Self, TlvLvError> {
Self::new(FilestoreActionCode::DenyFile, file_name, None)
pub fn new_deny_directory(dir_name: Lv<'first_name>) -> Result<Self, TlvLvError> {
Self::new(FilestoreActionCode::DenyDirectory, dir_name, None)
/// This function will return [None] if the respective action code requires two names but
/// only one is passed. It will also returns [None] if the cumulative length of the first
/// name and the second name exceeds 255 bytes.
/// Two file paths are required for the rename, append and replace filestore request.
pub fn new(
action_code: FilestoreActionCode,
first_name: Lv<'first_name>,
second_name: Option<Lv<'second_name>>,
let mut base_value_len = first_name.len_full();
if fs_request_has_second_filename(action_code) {
if second_name.is_none() {
return Err(TlvLvError::SecondNameMissing);
base_value_len += second_name.as_ref().unwrap().len_full();
if base_value_len > u8::MAX as usize {
return Err(TlvLvError::InvalidValueLength(base_value_len));
base: FilestoreTlvBase {
action_code,
first_name,
second_name,
pub fn action_code(&self) -> FilestoreActionCode {
self.base.action_code
pub fn first_name(&self) -> Lv<'first_name> {
self.base.first_name
pub fn second_name(&self) -> Option<Lv<'second_name>> {
self.base.second_name
self.base.base_len_value()
2 + self.len_value()
pub fn from_bytes<'longest: 'first_name + 'second_name>(
buf: &'longest [u8],
return Err(ByteConversionError::FromSliceTooSmall {
.into());
verify_tlv_type(buf[0], TlvType::FilestoreRequest)?;
let len = buf[1] as usize;
let mut current_idx = 2;
let action_code = FilestoreActionCode::try_from((buf[2] >> 4) & 0b1111)
.map_err(|_| TlvLvError::InvalidFilestoreActionCode((buf[2] >> 4) & 0b1111))?;
current_idx += 1;
let first_name = Lv::from_bytes(&buf[current_idx..])?;
let mut second_name = None;
current_idx += first_name.len_full();
if current_idx >= 2 + len {
second_name = Some(Lv::from_bytes(&buf[current_idx..])?);
// The API should ensure the data field is never too large, so unwrapping here is okay.
TlvOwned::new(TlvType::FilestoreRequest, &self.to_vec()[2..]).unwrap()
impl WritableTlv for FilestoreRequestTlv<'_, '_> {
if buf.len() < self.len_full() {
expected: self.len_full(),
buf[0] = TlvType::FilestoreRequest as u8;
buf[1] = self.len_value() as u8;
buf[2] = (self.base.action_code as u8) << 4;
let mut current_idx = 3;
// Length checks were already performed.
self.base.first_name.write_to_be_bytes_no_len_check(
&mut buf[current_idx..current_idx + self.base.first_name.len_full()],
);
current_idx += self.base.first_name.len_full();
if let Some(second_name) = self.base.second_name {
second_name.write_to_be_bytes_no_len_check(
&mut buf[current_idx..current_idx + second_name.len_full()],
current_idx += second_name.len_full();
Ok(current_idx)
impl GenericTlv for FilestoreRequestTlv<'_, '_> {
TlvTypeField::Standard(TlvType::FilestoreRequest)
pub struct FilestoreResponseTlv<'first_name, 'second_name, 'fs_msg> {
status_code: u8,
filestore_message: Lv<'fs_msg>,
impl<'first_name, 'second_name, 'fs_msg> FilestoreResponseTlv<'first_name, 'second_name, 'fs_msg> {
pub fn new_no_filestore_message(
status_code,
Lv::new_empty(),
if Self::has_second_filename(action_code) {
filestore_message,
pub fn has_second_filename(action_code: FilestoreActionCode) -> bool {
pub fn status_code(&self) -> u8 {
self.status_code
self.base.base_len_value() + self.filestore_message.len_full()
pub fn from_bytes<'buf: 'first_name + 'second_name + 'fs_msg>(
buf: &'buf [u8],
verify_tlv_type(buf[0], TlvType::FilestoreResponse)?;
let len_check = |current_idx: &mut usize, add_len: usize| -> Result<(), TlvLvError> {
if *current_idx + add_len > buf.len() {
expected: *current_idx,
len_check(&mut current_idx, len)?;
let status_code = buf[2] & 0b1111;
len_check(&mut current_idx, first_name.len_full())?;
let second_name_lv = Lv::from_bytes(&buf[current_idx..])?;
current_idx += second_name_lv.len_full();
second_name = Some(second_name_lv);
let filestore_message = Lv::from_bytes(&buf[current_idx..])?;
len_check(&mut current_idx, filestore_message.len_full())?;
// The API should ensure the data field is never too large, so unwrap is okay here.
TlvOwned::new(TlvType::FilestoreResponse, &self.to_vec()[2..]).unwrap()
impl WritableTlv for FilestoreResponseTlv<'_, '_, '_> {
buf[0] = TlvType::FilestoreResponse as u8;
buf[2] = ((self.base.action_code as u8) << 4) | (self.status_code & 0b1111);
current_idx += second_name.write_to_be_bytes_no_len_check(
current_idx += self.filestore_message.write_to_be_bytes_no_len_check(
&mut buf[current_idx..current_idx + self.filestore_message.len_full()],
impl GenericTlv for FilestoreResponseTlv<'_, '_, '_> {
TlvTypeField::Standard(TlvType::FilestoreResponse)
pub(crate) fn verify_tlv_type(raw_type: u8, expected_tlv_type: TlvType) -> Result<(), TlvLvError> {
let tlv_type = TlvType::try_from(raw_type).map_err(|_| TlvLvError::InvalidTlvTypeField {
found: raw_type,
expected: Some(expected_tlv_type.into()),
})?;
if tlv_type != expected_tlv_type {
expected: Some(expected_tlv_type as u8),
#[cfg(test)]
mod tests {
use crate::cfdp::lv::Lv;
use crate::cfdp::tlv::{FilestoreActionCode, FilestoreRequestTlv, Tlv, TlvType, TlvTypeField};
use crate::util::{UbfU16, UbfU8, UnsignedEnum};
use alloc::string::ToString;
const TLV_TEST_STR_0: &str = "hello.txt";
const TLV_TEST_STR_1: &str = "hello2.txt";
#[test]
fn test_basic() {
let entity_id = UbfU8::new(5);
let mut buf: [u8; 4] = [0; 4];
assert!(entity_id.write_to_be_bytes(&mut buf).is_ok());
let tlv_res = Tlv::new(TlvType::EntityId, &buf[0..1]);
assert!(tlv_res.is_ok());
let tlv_res = tlv_res.unwrap();
assert_eq!(
tlv_res.tlv_type_field(),
assert_eq!(tlv_res.len_full(), 3);
assert_eq!(tlv_res.value().len(), 1);
assert_eq!(tlv_res.len_value(), 1);
assert!(!tlv_res.is_empty());
assert_eq!(tlv_res.value()[0], 5);
fn test_serialization() {
let mut ser_buf: [u8; 4] = [0; 4];
assert!(tlv_res.write_to_bytes(&mut ser_buf).is_ok());
assert_eq!(ser_buf[0], TlvType::EntityId as u8);
assert_eq!(ser_buf[1], 1);
assert_eq!(ser_buf[2], 5);
fn test_deserialization() {
assert!(entity_id.write_to_be_bytes(&mut buf[2..]).is_ok());
buf[1] = 1;
let tlv_from_raw = Tlv::from_bytes(&buf);
assert!(tlv_from_raw.is_ok());
let tlv_from_raw = tlv_from_raw.unwrap();
assert!(tlv_from_raw.raw_data().is_some());
assert_eq!(tlv_from_raw.raw_data().unwrap(), buf);
tlv_from_raw.tlv_type_field(),
assert_eq!(tlv_from_raw.value().len(), 1);
assert_eq!(tlv_from_raw.len_full(), 3);
assert_eq!(tlv_from_raw.value()[0], 5);
fn test_entity_id_tlv() {
let entity_id = UbfU16::new(0x0102);
let entity_id_tlv = EntityIdTlv::new(entity_id.into());
let mut buf: [u8; 16] = [0; 16];
let written_len = entity_id_tlv.write_to_bytes(&mut buf).unwrap();
assert_eq!(written_len, entity_id_tlv.len_full());
assert_eq!(entity_id_tlv.len_value(), 2);
assert!(entity_id_tlv.is_standard_tlv());
assert_eq!(entity_id_tlv.tlv_type().unwrap(), TlvType::EntityId);
assert_eq!(buf[0], TlvType::EntityId as u8);
assert_eq!(buf[1], 2);
assert_eq!(u16::from_be_bytes(buf[2..4].try_into().unwrap()), 0x0102);
let entity_id_as_vec = entity_id_tlv.to_vec();
assert_eq!(entity_id_as_vec, buf[0..written_len].to_vec());
fn test_entity_id_from_generic_tlv() {
let entity_id_as_tlv: Tlv = entity_id_tlv.to_tlv(&mut buf).unwrap();
let entity_id_converted_back: EntityIdTlv = entity_id_as_tlv.try_into().unwrap();
assert_eq!(entity_id_converted_back, entity_id_tlv);
fn test_entity_id_from_raw() {
let _ = entity_id_tlv.write_to_bytes(&mut buf).unwrap();
let entity_tlv_from_raw =
EntityIdTlv::from_bytes(&buf).expect("creating entity ID TLV failed");
assert_eq!(entity_tlv_from_raw, entity_id_tlv);
assert_eq!(entity_tlv_from_raw.entity_id(), &entity_id.into());
fn test_empty() {
let tlv_empty = Tlv::new_empty(TlvType::MsgToUser);
assert_eq!(tlv_empty.value().len(), 0);
assert!(tlv_empty.is_empty());
assert_eq!(tlv_empty.len_full(), 2);
assert!(tlv_empty.value().is_empty());
tlv_empty.tlv_type_field(),
TlvTypeField::Standard(TlvType::MsgToUser)
fn test_empty_serialization() {
assert!(tlv_empty.write_to_bytes(&mut buf).is_ok());
assert_eq!(buf[0], TlvType::MsgToUser as u8);
assert_eq!(buf[1], 0);
fn test_empty_deserialization() {
buf[0] = TlvType::MsgToUser as u8;
buf[1] = 0;
let tlv_empty = Tlv::from_bytes(&buf);
assert!(tlv_empty.is_ok());
let tlv_empty = tlv_empty.unwrap();
fn test_write_buf_too_small() {
let mut buf: [u8; 2] = [0; 2];
let fs_request =
FilestoreRequestTlv::new_create_file(Lv::new_from_str(TLV_TEST_STR_0).unwrap())
.unwrap();
let error = fs_request.write_to_bytes(&mut buf);
assert!(error.is_err());
let error = error.unwrap_err();
if let ByteConversionError::ToSliceTooSmall { found, expected } = error {
assert_eq!(found, 2);
assert_eq!(expected, 13);
panic!("unexpected error {:?}", error);
fn test_read_from_buf_too_small() {
let buf: [u8; 1] = [0; 1];
let error = FilestoreRequestTlv::from_bytes(&buf);
if let TlvLvError::ByteConversion(ByteConversionError::FromSliceTooSmall {
found,
expected,
}) = error
assert_eq!(found, 1);
assert_eq!(expected, 2);
fn test_buf_too_large() {
let buf_too_large: [u8; u8::MAX as usize + 1] = [0; u8::MAX as usize + 1];
let tlv_res = Tlv::new(TlvType::MsgToUser, &buf_too_large);
assert!(tlv_res.is_err());
let error = tlv_res.unwrap_err();
assert_eq!(error.0, u8::MAX as usize + 1);
error.to_string(),
"data with size 256 larger than allowed 255 bytes"
fn test_deserialization_custom_tlv_type() {
buf[0] = 3;
buf[2] = 5;
let tlv = Tlv::from_bytes(&buf);
assert!(tlv.is_ok());
let tlv = tlv.unwrap();
assert_eq!(tlv.tlv_type_field(), TlvTypeField::Custom(3));
assert!(!tlv.is_standard_tlv());
assert_eq!(tlv.value().len(), 1);
assert_eq!(tlv.len_full(), 3);
fn generic_fs_request_test_one_file(
) -> FilestoreRequestTlv<'static, 'static> {
assert!(!fs_request_has_second_filename(action_code));
let first_name = Lv::new_from_str(TLV_TEST_STR_0).unwrap();
let fs_request = match action_code {
FilestoreActionCode::CreateFile => FilestoreRequestTlv::new_create_file(first_name),
FilestoreActionCode::DeleteFile => FilestoreRequestTlv::new_delete_file(first_name),
FilestoreActionCode::CreateDirectory => {
FilestoreRequestTlv::new_create_directory(first_name)
FilestoreActionCode::RemoveDirectory => {
FilestoreRequestTlv::new_remove_directory(first_name)
FilestoreActionCode::DenyFile => FilestoreRequestTlv::new_deny_file(first_name),
FilestoreActionCode::DenyDirectory => {
FilestoreRequestTlv::new_deny_directory(first_name)
_ => panic!("invalid action code"),
assert!(fs_request.is_ok());
let fs_request = fs_request.unwrap();
assert_eq!(fs_request.len_value(), 1 + first_name.len_full());
assert_eq!(fs_request.len_full(), fs_request.len_value() + 2);
assert_eq!(fs_request.action_code(), action_code);
assert_eq!(fs_request.first_name(), first_name);
assert_eq!(fs_request.second_name(), None);
fs_request
fn generic_fs_request_test_two_files(
assert!(fs_request_has_second_filename(action_code));
let second_name = Lv::new_from_str(TLV_TEST_STR_1).unwrap();
FilestoreActionCode::ReplaceFile => {
FilestoreRequestTlv::new_replace_file(first_name, second_name)
FilestoreActionCode::AppendFile => {
FilestoreRequestTlv::new_append_file(first_name, second_name)
FilestoreActionCode::RenameFile => {
FilestoreRequestTlv::new_rename_file(first_name, second_name)
fs_request.len_value(),
1 + first_name.len_full() + second_name.len_full()
fs_request.tlv_type_field(),
assert_eq!(fs_request.len_written(), fs_request.len_full());
assert!(fs_request.second_name().is_some());
assert_eq!(fs_request.second_name().unwrap(), second_name);
fn test_fs_request_basic_create_file() {
generic_fs_request_test_one_file(FilestoreActionCode::CreateFile);
fn test_fs_request_basic_delete() {
generic_fs_request_test_one_file(FilestoreActionCode::DeleteFile);
fn test_fs_request_basic_create_dir() {
generic_fs_request_test_one_file(FilestoreActionCode::CreateDirectory);
fn test_fs_request_basic_remove_dir() {
generic_fs_request_test_one_file(FilestoreActionCode::RemoveDirectory);
fn test_fs_request_basic_deny_file() {
generic_fs_request_test_one_file(FilestoreActionCode::DenyFile);
fn test_fs_request_basic_deny_dir() {
generic_fs_request_test_one_file(FilestoreActionCode::DenyDirectory);
fn test_fs_request_basic_append_file() {
generic_fs_request_test_two_files(FilestoreActionCode::AppendFile);
fn test_fs_request_basic_rename_file() {
generic_fs_request_test_two_files(FilestoreActionCode::RenameFile);
fn test_fs_request_basic_replace_file() {
generic_fs_request_test_two_files(FilestoreActionCode::ReplaceFile);
fn check_fs_request_first_part(
buf: &[u8],
expected_val_len: u8,
) -> usize {
assert_eq!(buf[0], TlvType::FilestoreRequest as u8);
assert_eq!(buf[1], expected_val_len);
assert_eq!((buf[2] >> 4) & 0b1111, action_code as u8);
let lv = Lv::from_bytes(&buf[3..]);
assert!(lv.is_ok());
let lv = lv.unwrap();
assert_eq!(lv.value_as_str().unwrap().unwrap(), TLV_TEST_STR_0);
3 + lv.len_full()
fn test_fs_request_serialization_one_file() {
let req = generic_fs_request_test_one_file(FilestoreActionCode::CreateFile);
let mut buf: [u8; 64] = [0; 64];
let res = req.write_to_bytes(&mut buf);
assert!(res.is_ok());
let written = res.unwrap();
assert_eq!(written, 3 + 1 + TLV_TEST_STR_0.len());
assert_eq!(written, req.len_full());
check_fs_request_first_part(
&buf,
FilestoreActionCode::CreateFile,
1 + 1 + TLV_TEST_STR_0.len() as u8,
fn test_fs_request_deserialization_one_file() {
let req_conv_back = FilestoreRequestTlv::from_bytes(&buf);
assert!(req_conv_back.is_ok());
let req_conv_back = req_conv_back.unwrap();
assert_eq!(req_conv_back, req);
fn test_fs_request_serialization_two_files() {
let req = generic_fs_request_test_two_files(FilestoreActionCode::RenameFile);
written,
3 + 1 + TLV_TEST_STR_0.len() + 1 + TLV_TEST_STR_1.len()
let current_idx = check_fs_request_first_part(
1 + 1 + TLV_TEST_STR_0.len() as u8 + 1 + TLV_TEST_STR_1.len() as u8,
let second_lv = Lv::from_bytes(&buf[current_idx..]);
assert!(second_lv.is_ok());
let second_lv = second_lv.unwrap();
assert_eq!(second_lv.value_as_str().unwrap().unwrap(), TLV_TEST_STR_1);
assert_eq!(current_idx + second_lv.len_full(), req.len_full());
fn test_fs_request_deserialization_two_files() {
req.write_to_bytes(&mut buf).unwrap();
fn test_fs_response_state_one_path() {
let lv_0 = Lv::new_from_str(TLV_TEST_STR_0).unwrap();
let response = FilestoreResponseTlv::new_no_filestore_message(
0b0001,
lv_0,
None,
.expect("creating response failed");
assert_eq!(response.status_code(), 0b0001);
assert_eq!(response.action_code(), FilestoreActionCode::CreateFile);
assert_eq!(response.first_name(), lv_0);
assert!(response.second_name().is_none());
fn test_fs_response_state_two_paths() {
let lv_1 = Lv::new_from_str(TLV_TEST_STR_1).unwrap();
Some(lv_1),
assert_eq!(response.action_code(), FilestoreActionCode::RenameFile);
assert!(response.second_name().is_some());
assert!(response.second_name().unwrap() == lv_1);
response.len_full(),
2 + 1 + lv_0.len_full() + lv_1.len_full() + 1
fn test_fs_response_serialization() {
let mut buf: [u8; 32] = [0; 32];
let written_len = response.write_to_bytes(&mut buf).unwrap();
assert_eq!(written_len, 2 + 1 + lv_0.len_full() + 1);
assert_eq!(buf[0], TlvType::FilestoreResponse as u8);
assert_eq!(buf[1], written_len as u8 - 2);
(buf[2] >> 4) & 0b1111,
FilestoreActionCode::CreateFile as u8
assert_eq!(buf[2] & 0b1111, 0b0001);
let lv_read_back = Lv::from_bytes(&buf[3..]).unwrap();
assert_eq!(lv_0, lv_read_back);
let current_idx = 3 + lv_0.len_full();
let fs_msg_empty = Lv::from_bytes(&buf[current_idx..]).unwrap();
assert!(fs_msg_empty.is_empty());
fn test_fs_response_deserialization() {
response.write_to_bytes(&mut buf).unwrap();
let response_read_back = FilestoreResponseTlv::from_bytes(&buf).unwrap();
assert_eq!(response_read_back, response);
fn test_entity_it_tlv_to_tlv() {
let mut binding = [0; 16];
let tlv = entity_id_tlv.to_tlv(&mut binding).unwrap();
tlv.tlv_type_field(),
assert_eq!(tlv.len_full(), 4);
assert_eq!(tlv.len_value(), 2);
assert_eq!(tlv.value(), &[0x01, 0x02]);
fn test_invalid_tlv_conversion() {
let msg_to_user_tlv = Tlv::new_empty(TlvType::MsgToUser);
let error = EntityIdTlv::try_from(msg_to_user_tlv);
if let TlvLvError::InvalidTlvTypeField { found, expected } = error {
assert_eq!(found, TlvType::MsgToUser as u8);
assert_eq!(expected, Some(TlvType::EntityId as u8));
"invalid TLV type field, found 2, expected Some(6)"
panic!("unexpected error");
fn test_entity_id_invalid_value_len() {
entity_id_tlv.write_to_bytes(&mut buf).unwrap();
buf[1] = 12;
let error = EntityIdTlv::from_bytes(&buf);
if let TlvLvError::InvalidValueLength(len) = error {
assert_eq!(len, 12);
assert_eq!(error.to_string(), "invalid value length 12");
fn test_custom_tlv() {
let custom_tlv = Tlv::new_with_custom_type(20, &[]).unwrap();
assert!(custom_tlv.tlv_type().is_none());
if let TlvTypeField::Custom(val) = custom_tlv.tlv_type_field() {
assert_eq!(val, 20);
panic!("unexpected type field");
let tlv_as_vec = custom_tlv.to_vec();
assert_eq!(tlv_as_vec.len(), 2);
assert_eq!(tlv_as_vec[0], 20);
assert_eq!(tlv_as_vec[1], 0);
fn test_tlv_to_owned() {
let tlv_owned = tlv_res.to_owned();
assert_eq!(tlv_res, tlv_owned);
let tlv_owned_from_conversion: TlvOwned = tlv_res.into();
assert_eq!(tlv_owned_from_conversion, tlv_owned);
assert_eq!(tlv_owned_from_conversion, tlv_res);
fn test_owned_tlv() {
let tlv_res = TlvOwned::new(TlvType::EntityId, &buf[0..1]).expect("creating TLV failed");
fn test_owned_tlv_empty() {
let tlv_res = TlvOwned::new_empty(TlvType::FlowLabel);
TlvTypeField::Standard(TlvType::FlowLabel)
assert_eq!(tlv_res.len_full(), 2);
assert_eq!(tlv_res.value().len(), 0);
assert_eq!(tlv_res.len_value(), 0);
assert!(tlv_res.is_empty());
fn test_owned_tlv_custom_type() {
let tlv_res = TlvOwned::new_with_custom_type(32, &[]).unwrap();
assert_eq!(tlv_res.tlv_type_field(), TlvTypeField::Custom(32));
fn test_owned_tlv_conversion_to_bytes() {
assert_eq!(tlv_res.to_vec(), tlv_owned_from_conversion.to_vec());