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-rw-r--r--src/lib.rs23
1 files changed, 17 insertions, 6 deletions
diff --git a/src/lib.rs b/src/lib.rs
index a5b8767..89b3579 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -38,17 +38,28 @@ pub trait DecodeError {
fn bad_operand(&self) -> bool;
}
-pub enum ReadError {
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+pub enum StandardDecodeError {
ExhaustedInput,
- IOError(&'static str),
+ InvalidOpcode,
+ InvalidOperand,
}
-pub trait Reader<Item> {
- fn next(&mut self) -> Result<Item, ReadError>;
+impl fmt::Display for StandardDecodeError {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self {
+ StandardDecodeError::ExhaustedInput => write!(f, "exhausted input"),
+ StandardDecodeError::InvalidOpcode => write!(f, "invalid opcode"),
+ StandardDecodeError::InvalidOperand => write!(f, "invalid operand"),
+ }
+ }
}
-pub trait Decoder<A: Arch + ?Sized> {
- type Error: DecodeError + Debug + Display;
+impl DecodeError for StandardDecodeError {
+ fn data_exhausted(&self) -> bool { *self == StandardDecodeError::ExhaustedInput }
+ fn bad_opcode(&self) -> bool { *self == StandardDecodeError::InvalidOpcode }
+ fn bad_operand(&self) -> bool { *self == StandardDecodeError::InvalidOperand }
+}
fn decode<T: Reader<A::Word>>(&self, bytes: &mut T) -> Result<A::Instruction, Self::Error> {
let mut inst = A::Instruction::default();