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extern crate alloc;
use crate::{account_info::AccountInfo, program_error::ProgramError, pubkey::Pubkey};
use alloc::vec::Vec;
use std::{
cell::RefCell,
mem::size_of,
rc::Rc,
result::Result as ResultGeneric,
slice::{from_raw_parts, from_raw_parts_mut},
};
pub type ProgramResult = ResultGeneric<(), ProgramError>;
pub type ProcessInstruction =
fn(program_id: &Pubkey, accounts: &[AccountInfo], instruction_data: &[u8]) -> ProgramResult;
pub const SUCCESS: u64 = 0;
#[macro_export]
macro_rules! entrypoint_deprecated {
($process_instruction:ident) => {
#[no_mangle]
pub unsafe extern "C" fn entrypoint(input: *mut u8) -> u64 {
let (program_id, accounts, instruction_data) =
unsafe { $crate::entrypoint_deprecated::deserialize(input) };
match $process_instruction(&program_id, &accounts, &instruction_data) {
Ok(()) => $crate::entrypoint_deprecated::SUCCESS,
Err(error) => error.into(),
}
}
};
}
#[allow(clippy::type_complexity)]
pub unsafe fn deserialize<'a>(input: *mut u8) -> (&'a Pubkey, Vec<AccountInfo<'a>>, &'a [u8]) {
let mut offset: usize = 0;
#[allow(clippy::cast_ptr_alignment)]
let num_accounts = *(input.add(offset) as *const u64) as usize;
offset += size_of::<u64>();
let mut accounts = Vec::with_capacity(num_accounts);
for _ in 0..num_accounts {
let dup_info = *(input.add(offset) as *const u8);
offset += size_of::<u8>();
if dup_info == std::u8::MAX {
#[allow(clippy::cast_ptr_alignment)]
let is_signer = *(input.add(offset) as *const u8) != 0;
offset += size_of::<u8>();
#[allow(clippy::cast_ptr_alignment)]
let is_writable = *(input.add(offset) as *const u8) != 0;
offset += size_of::<u8>();
let key: &Pubkey = &*(input.add(offset) as *const Pubkey);
offset += size_of::<Pubkey>();
#[allow(clippy::cast_ptr_alignment)]
let lamports = Rc::new(RefCell::new(&mut *(input.add(offset) as *mut u64)));
offset += size_of::<u64>();
#[allow(clippy::cast_ptr_alignment)]
let data_len = *(input.add(offset) as *const u64) as usize;
offset += size_of::<u64>();
let data = Rc::new(RefCell::new({
from_raw_parts_mut(input.add(offset), data_len)
}));
offset += data_len;
let owner: &Pubkey = &*(input.add(offset) as *const Pubkey);
offset += size_of::<Pubkey>();
#[allow(clippy::cast_ptr_alignment)]
let executable = *(input.add(offset) as *const u8) != 0;
offset += size_of::<u8>();
#[allow(clippy::cast_ptr_alignment)]
let rent_epoch = *(input.add(offset) as *const u64);
offset += size_of::<u64>();
accounts.push(AccountInfo {
is_signer,
is_writable,
key,
lamports,
data,
owner,
executable,
rent_epoch,
});
} else {
accounts.push(accounts[dup_info as usize].clone());
}
}
#[allow(clippy::cast_ptr_alignment)]
let instruction_data_len = *(input.add(offset) as *const u64) as usize;
offset += size_of::<u64>();
let instruction_data = { from_raw_parts(input.add(offset), instruction_data_len) };
offset += instruction_data_len;
let program_id: &Pubkey = &*(input.add(offset) as *const Pubkey);
(program_id, accounts, instruction_data)
}