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Implements From<DekuError> for no_std_io::io::Error in no_std context #578

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Merged
sharksforarms merged 1 commit into from
Jul 22, 2025
Merged

Implements From<DekuError> for no_std_io::io::Error in no_std context #578

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1 change: 0 additions & 1 deletion Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,6 @@ std = ["deku_derive/std", "bitvec?/std", "alloc", "no_std_io/std"]
alloc = ["bitvec?/alloc"]
logging = ["deku_derive/logging", "log"]
no-assert-string = ["deku_derive/no-assert-string"]
error_in_core = []
bits = ["dep:bitvec", "deku_derive/bits"]

[dependencies]
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22 changes: 19 additions & 3 deletions src/error.rs
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Expand Up @@ -90,6 +90,25 @@ impl core::fmt::Display for DekuError {
}
}

#[cfg(not(feature = "std"))]
impl core::error::Error for DekuError {}

#[cfg(not(feature = "std"))]
impl From<DekuError> for no_std_io::io::Error {
fn from(error: DekuError) -> Self {
use no_std_io::io;
match error {
DekuError::Incomplete(_) => io::Error::new(io::ErrorKind::UnexpectedEof, error),
DekuError::Parse(_) => io::Error::new(io::ErrorKind::InvalidData, error),
DekuError::InvalidParam(_) => io::Error::new(io::ErrorKind::InvalidInput, error),
DekuError::Assertion(_) => io::Error::new(io::ErrorKind::InvalidData, error),
DekuError::AssertionNoStr => io::Error::from(io::ErrorKind::InvalidData),
DekuError::IdVariantNotFound => io::Error::new(io::ErrorKind::NotFound, error),
DekuError::Io(e) => io::Error::new(e, error),
}
}
}

#[cfg(feature = "std")]
impl std::error::Error for DekuError {
fn cause(&self) -> Option<&dyn std::error::Error> {
Expand All @@ -112,6 +131,3 @@ impl From<DekuError> for std::io::Error {
}
}
}

#[cfg(feature = "error_in_core")]
impl core::error::Error for DekuError {}
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