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use std::collections::BTreeMap;
use crate::{
intermediate::{
error::{GrammarError, GrammarErrorType},
information_object::*,
*,
},
lexer::asn1_value,
};
pub(crate) fn find_tld_or_enum_value_by_name(
type_name: &String,
name: &String,
tlds: &BTreeMap<String, ToplevelDefinition>,
) -> Option<ASN1Value> {
if let Some(ToplevelDefinition::Value(v)) = tlds.get(name) {
return Some(v.value.clone());
} else {
for (_, tld) in tlds.iter() {
if let Some(value) = tld.get_distinguished_or_enum_value(Some(type_name), name) {
return Some(value);
}
}
// Make second attempt without requiring a matching type name
// This is the current best shot at linking inner subtypes
for (_, tld) in tlds.iter() {
if let Some(value) = tld.get_distinguished_or_enum_value(None, name) {
return Some(value);
}
}
}
None
}
pub(crate) fn octet_string_to_bit_string(bytes: &[u8]) -> Vec<bool> {
let mut bits = vec![];
for byte in bytes {
is_bit_set(*byte, 128, &mut bits);
}
bits
}
fn is_bit_set(rem: u8, limit: u8, bits: &mut Vec<bool>) {
bits.push(rem >= limit);
if limit >= 2 {
is_bit_set(rem % limit, limit / 2, bits)
}
}
pub(crate) fn bit_string_to_octet_string(bits: &[bool]) -> Result<Vec<u8>, GrammarError> {
let mut octets = vec![];
for byte in bits.chunks(8) {
if byte.len() != 8 {
return Err(GrammarError::new(
"Binary octet string value needs to be a multiple of 8 bits!",
GrammarErrorType::LinkerError,
));
}
octets.push(byte.iter().enumerate().fold(0u8, |acc, (i, bit)| {
acc + if *bit { 2u8.pow(7 - i as u32) } else { 0 }
}));
}
Ok(octets)
}
pub(crate) fn walk_object_field_ref_path<'a>(
fields: &'a Vec<InformationObjectClassField>,
path: &'a Vec<ObjectFieldIdentifier>,
mut index: usize,
) -> Option<&'a InformationObjectClassField> {
fields
.iter()
.find_map(|f| {
path.get(index).and_then(|id| {
(&f.identifier == id).then(|| {
if path.len() == (index + 1) {
Some(f)
} else {
index += 1;
walk_object_field_ref_path(fields, path, index)
}
})
})
})
.flatten()
}
/// Resolves the custom syntax declared in an information object class' WITH SYNTAX clause
pub fn resolve_custom_syntax(
fields: &mut InformationObjectFields,
class: &ObjectClassDefn,
) -> Result<(), GrammarError> {
if let InformationObjectFields::CustomSyntax(application) = fields {
let tokens = match &class.syntax {
Some(s) => s.flatten(),
None => {
return Err(GrammarError::new(
"No syntax definition for information object class found!",
GrammarErrorType::LinkerError,
))
}
};
let mut unsorted_default_syntax = Vec::<(usize, InformationObjectField)>::new();
let mut application_index = 0;
'syntax_matching: for (i, (required, token)) in tokens.iter().enumerate() {
if let Some(expr) = application.get_mut(application_index) {
if expr.matches(token, &tokens, i) {
match expr {
SyntaxApplication::ObjectSetDeclaration(o) => {
if let Some(index) =
class.fields.iter().enumerate().find_map(|(i, v)| {
(v.identifier
== ObjectFieldIdentifier::MultipleValue(
token.name_or_empty().to_owned(),
))
.then_some(i)
})
{
unsorted_default_syntax.push((
index,
InformationObjectField::ObjectSetField(ObjectSetField {
identifier: token.name_or_empty().to_owned(),
value: o.clone(),
}),
));
}
}
SyntaxApplication::LiteralOrTypeReference(t) => {
if let Some(index) =
class.fields.iter().enumerate().find_map(|(i, v)| {
(v.identifier
== ObjectFieldIdentifier::MultipleValue(
token.name_or_empty().to_owned(),
))
.then_some(i)
})
{
unsorted_default_syntax.push((
index,
InformationObjectField::TypeField(TypeField {
identifier: token.name_or_empty().to_owned(),
ty: ASN1Type::ElsewhereDeclaredType(t.clone()),
}),
));
} else if let Some(index) =
class.fields.iter().enumerate().find_map(|(i, v)| {
(v.identifier
== ObjectFieldIdentifier::SingleValue(
token.name_or_empty().to_owned(),
))
.then_some(i)
})
{
unsorted_default_syntax.push((
index,
InformationObjectField::FixedValueField(FixedValueField {
identifier: token.name_or_empty().to_owned(),
value: match asn1_value((t.identifier.as_str()).into()) {
Ok((_, v)) => Ok(v),
Err(e) => Err(GrammarError::new(
&format!(
"Syntax mismatch while resolving information object: {e:?}"
),
GrammarErrorType::SyntaxMismatch,
)),
}?,
}),
));
}
}
SyntaxApplication::TypeReference(t) => {
if let Some(index) =
class.fields.iter().enumerate().find_map(|(i, v)| {
(v.identifier
== ObjectFieldIdentifier::MultipleValue(
token.name_or_empty().to_owned(),
))
.then_some(i)
})
{
unsorted_default_syntax.push((
index,
InformationObjectField::TypeField(TypeField {
identifier: token.name_or_empty().to_owned(),
ty: t.clone(),
}),
));
}
}
SyntaxApplication::ValueReference(v) => {
if let Some(index) =
class.fields.iter().enumerate().find_map(|(i, v)| {
(v.identifier
== ObjectFieldIdentifier::SingleValue(
token.name_or_empty().to_owned(),
))
.then_some(i)
})
{
unsorted_default_syntax.push((
index,
InformationObjectField::FixedValueField(FixedValueField {
identifier: token.name_or_empty().to_owned(),
value: v.clone(),
}),
));
}
}
SyntaxApplication::Comma | SyntaxApplication::Literal(_) => {
// Skip ahead
}
}
application_index += 1;
} else if *required {
return Err(GrammarError::new(
"Syntax mismatch while resolving information object.",
GrammarErrorType::SyntaxMismatch,
));
} else {
continue 'syntax_matching;
}
} else if *required {
return Err(GrammarError::new(
"Syntax mismatch while resolving information object.",
GrammarErrorType::SyntaxMismatch,
));
} else {
continue 'syntax_matching;
}
}
unsorted_default_syntax.sort_by(|&(a, _), &(b, _)| a.cmp(&b));
*fields = InformationObjectFields::DefaultSyntax(
unsorted_default_syntax
.into_iter()
.map(|(_, field)| field)
.collect(),
);
}
Ok(())
}
#[cfg(test)]
mod tests {
use crate::validator::linking::utils::octet_string_to_bit_string;
#[test]
fn converts_octet_to_bit_string() {
assert_eq!(
octet_string_to_bit_string(&[76]),
vec![false, true, false, false, true, true, false, false]
);
assert_eq!(
octet_string_to_bit_string(&[129]),
vec![true, false, false, false, false, false, false, true]
);
assert_eq!(
octet_string_to_bit_string(&[128]),
vec![true, false, false, false, false, false, false, false]
);
assert_eq!(
octet_string_to_bit_string(&[0]),
vec![false, false, false, false, false, false, false, false]
);
assert_eq!(
octet_string_to_bit_string(&[32]),
vec![false, false, true, false, false, false, false, false]
);
assert_eq!(
octet_string_to_bit_string(&[89, 45]),
vec![
false, true, false, true, true, false, false, true, false, false, true, false,
true, true, false, true
]
);
}
}