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use crate::*;
use core::convert::TryFrom;
/// ASN.1 `BOOLEAN` type
///
/// BER objects consider any non-zero value as `true`, and `0` as `false`.
///
/// DER objects must use value `0x0` (`false`) or `0xff` (`true`).
#[derive(Debug, PartialEq, Eq)]
pub struct Boolean {
pub value: u8,
}
impl Boolean {
/// `BOOLEAN` object for value `false`
pub const FALSE: Boolean = Boolean::new(0);
/// `BOOLEAN` object for value `true`
pub const TRUE: Boolean = Boolean::new(0xff);
/// Create a new `Boolean` from the provided logical value.
#[inline]
pub const fn new(value: u8) -> Self {
Boolean { value }
}
/// Return the `bool` value from this object.
#[inline]
pub const fn bool(&self) -> bool {
self.value != 0
}
}
impl<'a> TryFrom<Any<'a>> for Boolean {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<Boolean> {
TryFrom::try_from(&any)
}
}
// non-consuming version
impl<'a, 'b> TryFrom<&'b Any<'a>> for Boolean {
type Error = Error;
fn try_from(any: &'b Any<'a>) -> Result<Boolean> {
any.tag().assert_eq(Self::TAG)?;
// X.690 section 8.2.1:
// The encoding of a boolean value shall be primitive. The contents octets shall consist of a single octet
if any.header.length != Length::Definite(1) {
return Err(Error::InvalidLength);
}
let value = any.data[0];
Ok(Boolean { value })
}
}
impl CheckDerConstraints for Boolean {
fn check_constraints(any: &Any) -> Result<()> {
let c = any.data[0];
// X.690 section 11.1
if !(c == 0 || c == 0xff) {
return Err(Error::DerConstraintFailed(DerConstraint::InvalidBoolean));
}
Ok(())
}
}
impl DerAutoDerive for Boolean {}
impl Tagged for Boolean {
const TAG: Tag = Tag::Boolean;
}
#[cfg(feature = "std")]
impl ToDer for Boolean {
fn to_der_len(&self) -> Result<usize> {
// 3 = 1 (tag) + 1 (length) + 1 (value)
Ok(3)
}
fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
writer.write(&[Self::TAG.0 as u8, 0x01]).map_err(Into::into)
}
fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
let b = if self.value != 0 { 0xff } else { 0x00 };
writer.write(&[b]).map_err(Into::into)
}
/// Similar to using `to_der`, but uses header without computing length value
fn write_der_raw(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
let sz = writer.write(&[Self::TAG.0 as u8, 0x01, self.value])?;
Ok(sz)
}
}
impl<'a> TryFrom<Any<'a>> for bool {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<bool> {
TryFrom::try_from(&any)
}
}
impl<'a, 'b> TryFrom<&'b Any<'a>> for bool {
type Error = Error;
fn try_from(any: &'b Any<'a>) -> Result<bool> {
any.tag().assert_eq(Self::TAG)?;
let b = Boolean::try_from(any)?;
Ok(b.bool())
}
}
impl CheckDerConstraints for bool {
fn check_constraints(any: &Any) -> Result<()> {
let c = any.data[0];
// X.690 section 11.1
if !(c == 0 || c == 0xff) {
return Err(Error::DerConstraintFailed(DerConstraint::InvalidBoolean));
}
Ok(())
}
}
impl DerAutoDerive for bool {}
impl Tagged for bool {
const TAG: Tag = Tag::Boolean;
}
#[cfg(feature = "std")]
impl ToDer for bool {
fn to_der_len(&self) -> Result<usize> {
// 3 = 1 (tag) + 1 (length) + 1 (value)
Ok(3)
}
fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
writer.write(&[Self::TAG.0 as u8, 0x01]).map_err(Into::into)
}
fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
let b = if *self { 0xff } else { 0x00 };
writer.write(&[b]).map_err(Into::into)
}
}
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