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pub mod error;
pub mod opcode;
pub mod prelude;
use num_traits::FromPrimitive;
use opcode::Python27;
use std::io::Read;
use crate::error::DecodeError;
use crate::opcode::{Instruction, Opcode};
pub fn decode<O: Opcode + FromPrimitive, R: Read>(
source: &mut R,
) -> Result<Instruction<O>, DecodeError> {
let mut opcode_buffer = [0u8];
source.read_exact(&mut opcode_buffer)?;
let opcode = O::from_u8(opcode_buffer[0])
.map_or(Err(DecodeError::UnknownOpcode(opcode_buffer[0])), Ok)?;
let arg = if opcode.has_arg() {
let mut argument_buffer = [0u8, 0u8];
source.read_exact(&mut argument_buffer)?;
Some(u16::from_le_bytes(argument_buffer))
} else {
None
};
Ok(Instruction { opcode, arg })
}
pub fn decode_py27(source: &mut impl Read) -> Result<Instruction<Python27>, DecodeError> {
decode::<Python27, _>(source)
}