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use hash::H256;
use bigint::U256;
use hash::Address;
#[derive(Debug)]
pub struct Error;
mod external {
#[cfg_attr(not(feature="std"), link(name = "env"))]
extern {
pub fn suicide(refund: *const u8) -> !;
}
#[cfg_attr(not(feature="std"), link(name = "env"))]
extern {
pub fn create(endowment: *const u8, code_ptr: *const u8, code_len: u32, result_ptr: *mut u8) -> i32;
}
#[cfg_attr(not(feature="std"), link(name = "env"))]
extern "C" {
pub fn ccall(
address: *const u8,
val_ptr: *const u8,
input_ptr: *const u8,
input_len: u32,
result_ptr: *mut u8,
result_len: u32,
) -> i32;
pub fn dcall(
address: *const u8,
input_ptr: *const u8,
input_len: u32,
result_ptr: *mut u8,
result_len: u32,
) -> i32;
pub fn scall(
address: *const u8,
input_ptr: *const u8,
input_len: u32,
result_ptr: *mut u8,
result_len: u32,
) -> i32;
pub fn blockhash(number: i64, dest: *mut u8) -> i32;
pub fn balance(address: *const u8, dest: *mut u8);
pub fn coinbase(dest: *mut u8);
pub fn timestamp() -> i64;
pub fn blocknumber() -> i64;
pub fn difficulty(dest: *mut u8);
pub fn gaslimit(dest: *mut u8);
pub fn sender(dest: *mut u8);
pub fn address(dest: *mut u8);
pub fn value(dest: *mut u8);
pub fn origin(dest: *mut u8);
pub fn elog(topic_ptr: *const u8, topic_count: u32, data_ptr: *const u8, data_len: u32);
}
}
pub fn suicide(refund: &Address) -> ! {
unsafe { external::suicide(refund.as_ptr()); }
}
pub fn balance(address: &Address) -> U256 {
unsafe { fetch_u256(|x| external::balance(address.as_ptr(), x) ) }
}
pub fn create(endowment: U256, code: &[u8]) -> Result<Address, Error> {
let mut endowment_arr = [0u8; 32];
endowment.to_big_endian(&mut endowment_arr);
let mut result = Address::new();
unsafe {
if external::create(endowment_arr.as_ptr(), code.as_ptr(), code.len() as u32, (&mut result).as_mut_ptr()) == 0 {
Ok(result)
} else {
Err(Error)
}
}
}
pub fn call(address: &Address, value: U256, input: &[u8], result: &mut [u8]) -> Result<(), Error> {
let mut value_arr = [0u8; 32];
value.to_big_endian(&mut value_arr);
unsafe {
match external::ccall(address.as_ptr(), value_arr.as_ptr(), input.as_ptr(), input.len() as u32, result.as_mut_ptr(), result.len() as u32) {
0 => Ok(()),
_ => Err(Error),
}
}
}
pub fn call_code(address: &Address, input: &[u8], result: &mut [u8]) -> Result<(), Error> {
unsafe {
match external::dcall(address.as_ptr(), input.as_ptr(), input.len() as u32, result.as_mut_ptr(), result.len() as u32) {
0 => Ok(()),
_ => Err(Error),
}
}
}
pub fn static_call(address: &Address, input: &[u8], result: &mut [u8]) -> Result<(), Error> {
unsafe {
match external::scall(address.as_ptr(), input.as_ptr(), input.len() as u32, result.as_mut_ptr(), result.len() as u32) {
0 => Ok(()),
_ => Err(Error),
}
}
}
pub fn block_hash(block_number: u64) -> Result<H256, Error> {
let mut res = H256::zero();
unsafe {
match external::blockhash(block_number as i64, res.as_mut_ptr()) {
0 => Ok(res),
_ => Err(Error),
}
}
}
unsafe fn fetch_address<F>(f: F) -> Address where F: Fn(*mut u8) {
let mut res = Address::zero();
f(res.as_mut_ptr());
res
}
unsafe fn fetch_u256<F>(f: F) -> U256 where F: Fn(*mut u8) {
let mut res = [0u8; 32];
f(res.as_mut_ptr());
U256::from_big_endian(&res)
}
pub fn coinbase() -> Address {
unsafe { fetch_address(|x| external::coinbase(x) ) }
}
pub fn timestamp() -> u64 {
unsafe { external::timestamp() as u64 }
}
pub fn block_number() -> u64 {
unsafe { external::blocknumber() as u64 }
}
pub fn difficulty() -> U256 {
unsafe { fetch_u256(|x| external::difficulty(x) ) }
}
pub fn gas_limit() -> U256 {
unsafe { fetch_u256(|x| external::gaslimit(x) ) }
}
pub fn sender() -> Address {
unsafe { fetch_address(|x| external::sender(x) ) }
}
pub fn origin() -> Address {
unsafe { fetch_address(|x| external::origin(x) ) }
}
pub fn value() -> U256 {
unsafe { fetch_u256(|x| external::value(x) ) }
}
pub fn address() -> Address {
unsafe { fetch_address(|x| external::address(x) ) }
}
pub fn log(topics: &[H256], data: &[u8]) {
unsafe { external::elog(topics.as_ptr() as *const u8, topics.len() as u32, data.as_ptr(), data.len() as u32); }
}