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Missing magic changed to be a unique error vs a parsing error #440

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dad5cc4
Added missing magic as specific error, such that building automatic p…
zachthayer May 19, 2024
3eaff69
Fix compile errors, fixed PR notes
zachthayer May 19, 2024
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2 changes: 1 addition & 1 deletion deku-derive/src/macros/deku_read.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -444,7 +444,7 @@ fn emit_magic_read(input: &DekuData) -> TokenStream {
if *__deku_byte != __deku_read_byte {
extern crate alloc;
use alloc::borrow::Cow;
return Err(::#crate_::DekuError::Parse(Cow::from(format!("Missing magic value {:?}", #magic))));
return Err(::#crate_::DekuError::Framing(::#crate_::error::NeedMagic::new(&__deku_magic[0..])));
}
}
}
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19 changes: 19 additions & 0 deletions src/error.rs
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Expand Up @@ -33,12 +33,29 @@ impl NeedSize {
}
}

/// Magic needed to frame message
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NeedMagic {
magic: Vec<u8>,
}

impl NeedMagic where {
/// Create new [NeedSize] from magic bytes
#[inline]
pub fn new(magic: &[u8]) -> Self {
Self { magic: magic.to_vec() }
}

}

/// Deku errors
#[derive(Debug, Clone, PartialEq, Eq)]
#[non_exhaustive]
pub enum DekuError {
/// Parsing error when reading
Incomplete(NeedSize),
/// Failed to find magic
Framing(NeedMagic),
/// Parsing error when reading
Parse(Cow<'static, str>),
/// Invalid parameter
Expand Down Expand Up @@ -80,6 +97,7 @@ impl core::fmt::Display for DekuError {
size.bit_size(),
size.byte_size()
),
DekuError::Framing(ref framing) => write!(f, "Missing magic framing bytes: {:?}", framing.magic),
DekuError::Parse(ref err) => write!(f, "Parse error: {err}"),
DekuError::InvalidParam(ref err) => write!(f, "Invalid param error: {err}"),
DekuError::Assertion(ref err) => write!(f, "Assertion error: {err}"),
Expand All @@ -103,6 +121,7 @@ impl From<DekuError> for std::io::Error {
use std::io;
match error {
DekuError::Incomplete(_) => io::Error::new(io::ErrorKind::UnexpectedEof, error),
DekuError::Framing(_) => io::Error::new(io::ErrorKind::InvalidData, 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),
Expand Down
2 changes: 1 addition & 1 deletion src/prelude.rs
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Expand Up @@ -2,7 +2,7 @@

[What is a prelude?](std::prelude)
*/
pub use crate::error::{DekuError, NeedSize};
pub use crate::error::{DekuError, NeedSize, NeedMagic};
pub use crate::{
deku_derive, reader::Reader, writer::Writer, DekuContainerRead, DekuContainerWrite,
DekuEnumExt, DekuRead, DekuReader, DekuUpdate, DekuWrite, DekuWriter,
Expand Down
18 changes: 9 additions & 9 deletions tests/test_magic.rs
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Expand Up @@ -7,16 +7,16 @@ use rstest::rstest;
#[rstest(input,
case(&hex!("64656b75")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("64656bde")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("6465ad75")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("64be6b75")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("ef656b75")),

#[should_panic(expected = "Incomplete(NeedSize { bits: 8 })")]
Expand All @@ -38,19 +38,19 @@ fn test_magic_struct(input: &[u8]) {
#[rstest(input,
case(&hex!("64656b7500")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("64656bde00")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("6465ad7500")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("64be6b7500")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("ef656b7500")),

#[should_panic(expected = "Parse(\"Missing magic value [100, 101, 107, 117]\")")]
#[should_panic(expected = "Framing(NeedMagic { magic: [100, 101, 107, 117] })")]
case(&hex!("64656b00")),

#[should_panic(expected = "Incomplete(NeedSize { bits: 8 })")]
Expand Down