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use byteorder::ByteOrder;
use core::convert::TryInto;
use crate::{Decode, Encode, EncodingFormat};
use crate::{SharedData, Signature, SimpleDecode};
use crate::{Variant, VariantError};
#[derive(Debug, Clone, Default)]
pub struct Array(Vec<Variant>);
impl Array {
pub fn new() -> Self {
Self::default()
}
pub fn new_from_vec(vec: Vec<Variant>) -> Result<Self, VariantError> {
if let Some(first) = vec.first() {
let first_sig = first.value_signature();
for element in &vec[1..] {
if element.value_signature() != first_sig {
return Err(VariantError::IncorrectType);
}
}
}
Ok(Array(vec))
}
pub fn new_from_vec_unchecked(vec: Vec<Variant>) -> Self {
Array(vec)
}
pub fn add_element<T: Encode>(&mut self, element: T) -> Result<(), VariantError> {
if self.0.last().map(|v| !T::is(v)).unwrap_or(false) {
return Err(VariantError::IncorrectType);
}
self.0.push(element.to_variant());
Ok(())
}
pub fn get_element<T: Decode>(&self, index: usize) -> Result<&T, VariantError> {
T::from_variant(&self.0[index])
}
fn get(&self) -> &Vec<Variant> {
&self.0
}
fn into_inner(self) -> Vec<Variant> {
self.0
}
}
impl Encode for Array {
const SIGNATURE_CHAR: char = 'a';
const SIGNATURE_STR: &'static str = "a";
const ALIGNMENT: usize = 4;
fn encode_into(&self, bytes: &mut Vec<u8>, format: EncodingFormat) {
Self::add_padding(bytes, format);
let len_position = bytes.len();
bytes.extend(&0u32.to_ne_bytes());
let n_bytes_before = bytes.len();
let mut first_element = true;
let mut first_padding = 0;
for element in self.get() {
if first_element {
first_padding = element.value_padding(bytes.len(), format);
first_element = false;
}
element.encode_value_into(bytes, format);
}
let len = crate::utils::usize_to_u32(bytes.len() - n_bytes_before - first_padding);
byteorder::NativeEndian::write_u32(&mut bytes[len_position..len_position + 4], len);
}
fn signature(&self) -> Signature {
let signature = format!("a{}", self.get()[0].value_signature().as_str());
Signature::from(signature)
}
fn to_variant(self) -> Variant {
Variant::Array(self)
}
fn is(variant: &Variant) -> bool {
if let Variant::Array(_) = variant {
true
} else {
false
}
}
}
impl Decode for Array {
fn slice_data(
data: impl Into<SharedData>,
signature: impl Into<Signature>,
format: EncodingFormat,
) -> Result<SharedData, VariantError> {
let signature = Self::ensure_correct_signature(signature)?;
let child_signature = crate::decode::slice_signature(&signature[1..])?;
let data = data.into();
let len_slice = u32::slice_data_simple(&data, format)?;
let mut extracted = len_slice.len();
let mut len = u32::decode_simple(&len_slice, format)? as usize + extracted;
let mut first_element = true;
while extracted < len {
let element_data = data.tail(extracted);
if first_element {
len += crate::encode::padding_for_signature(
element_data.position(),
child_signature.as_str(),
format,
);
first_element = false;
}
let slice = crate::decode::slice_data(element_data, child_signature.as_str(), format)?;
extracted += slice.len();
if extracted > len {
return Err(VariantError::InsufficientData);
}
}
if extracted == 0 {
return Err(VariantError::ExcessData);
}
Ok(data.head(extracted as usize))
}
fn decode(
data: impl Into<SharedData>,
signature: impl Into<Signature>,
format: EncodingFormat,
) -> Result<Self, VariantError> {
let data = data.into();
let padding = Self::padding(data.position(), format);
if data.len() < padding + 4 {
return Err(VariantError::InsufficientData);
}
let signature = Self::ensure_correct_signature(signature)?;
let child_signature = crate::decode::slice_signature(&signature[1..])?;
let mut extracted = padding + 4;
let mut len =
u32::decode_simple(&data.subset(padding, extracted), format)? as usize + extracted;
let mut elements = vec![];
let mut first_element = true;
while extracted < len {
let element_data = data.tail(extracted);
if first_element {
len += crate::encode::padding_for_signature(
element_data.position(),
child_signature.as_str(),
format,
);
first_element = false;
}
let slice = crate::decode::slice_data(element_data, child_signature.as_str(), format)?;
extracted += slice.len();
if extracted > len {
return Err(VariantError::InsufficientData);
}
let element = Variant::from_data_slice(slice, child_signature.as_str(), format)?;
elements.push(element);
}
if extracted == 0 {
return Err(VariantError::ExcessData);
}
Ok(Array::new_from_vec_unchecked(elements))
}
fn ensure_correct_signature(
signature: impl Into<Signature>,
) -> Result<Signature, VariantError> {
let signature = signature.into();
let len = signature.len();
let slice = Self::slice_signature(signature)?;
if slice.len() != len {
return Err(VariantError::IncorrectType);
}
Ok(slice)
}
fn slice_signature(signature: impl Into<Signature>) -> Result<Signature, VariantError> {
let signature = signature.into();
if signature.len() < 2 {
return Err(VariantError::InsufficientData);
}
if !signature.starts_with('a') {
return Err(VariantError::IncorrectType);
}
let slice = crate::decode::slice_signature(&signature[1..])?;
Ok(Signature::from(&signature[0..=slice.len()]))
}
fn take_from_variant(variant: Variant) -> Result<Self, VariantError> {
if let Variant::Array(value) = variant {
Ok(value)
} else {
Err(VariantError::IncorrectType)
}
}
fn from_variant(variant: &Variant) -> Result<&Self, VariantError> {
if let Variant::Array(value) = variant {
Ok(value)
} else {
Err(VariantError::IncorrectType)
}
}
}
impl<T> TryInto<Vec<T>> for Array
where
T: Decode,
{
type Error = VariantError;
fn try_into(self) -> Result<Vec<T>, VariantError> {
let mut v = vec![];
for value in self.into_inner() {
v.push(T::take_from_variant(value)?);
}
Ok(v)
}
}
impl<'a, T> TryInto<Vec<&'a T>> for &'a Array
where
T: Decode,
{
type Error = VariantError;
fn try_into(self) -> Result<Vec<&'a T>, VariantError> {
let mut v = vec![];
for value in self.get() {
v.push(T::from_variant(value)?);
}
Ok(v)
}
}
impl<T> From<Vec<T>> for Array
where
T: Encode,
{
fn from(values: Vec<T>) -> Self {
let v = values.into_iter().map(|value| value.to_variant()).collect();
Array::new_from_vec_unchecked(v)
}
}
impl From<crate::Dict> for Array {
fn from(value: crate::Dict) -> Self {
Array::from(value.into_inner())
}
}