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#![allow(clippy::integer_arithmetic)]
use crate::{instruction::Instruction, sanitize::SanitizeError};
pub struct Instructions();
crate::declare_sysvar_id!("Sysvar1nstructions1111111111111111111111111", Instructions);
pub fn load_current_index(data: &[u8]) -> u16 {
let mut instr_fixed_data = [0u8; 2];
let len = data.len();
instr_fixed_data.copy_from_slice(&data[len - 2..len]);
u16::from_le_bytes(instr_fixed_data)
}
pub fn store_current_index(data: &mut [u8], instruction_index: u16) {
let last_index = data.len() - 2;
data[last_index..last_index + 2].copy_from_slice(&instruction_index.to_le_bytes());
}
pub fn load_instruction_at(index: usize, data: &[u8]) -> Result<Instruction, SanitizeError> {
crate::message::Message::deserialize_instruction(index, data)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_load_store_instruction() {
let mut data = [4u8; 10];
store_current_index(&mut data, 3);
assert_eq!(load_current_index(&data), 3);
assert_eq!([4u8; 8], data[0..8]);
}
}