1234#![allow(dead_code)]56#[cfg(not(feature = "std"))]7use alloc::{8 string::{String, ToString},9 vec::Vec,10};11use evm_core::ExitError;12use primitive_types::{H160, U256};1314use crate::{execution::Error, types::string};15use crate::execution::Result;1617const ABI_ALIGNMENT: usize = 32;1819#[derive(Clone)]20pub struct AbiReader<'i> {21 buf: &'i [u8],22 offset: usize,23}24impl<'i> AbiReader<'i> {25 pub fn new(buf: &'i [u8]) -> Self {26 Self { buf, offset: 0 }27 }28 pub fn new_call(buf: &'i [u8]) -> Result<(u32, Self)> {29 if buf.len() < 4 {30 return Err(Error::Error(ExitError::OutOfOffset));31 }32 let mut method_id = [0; 4];33 method_id.copy_from_slice(&buf[0..4]);3435 Ok((u32::from_be_bytes(method_id), Self { buf, offset: 4 }))36 }3738 fn read_padleft<const S: usize>(&mut self) -> Result<[u8; S]> {39 if self.buf.len() - self.offset < 32 {40 return Err(Error::Error(ExitError::OutOfOffset));41 }42 let mut block = [0; S];43 44 if !self.buf[self.offset..self.offset + ABI_ALIGNMENT - S]45 .iter()46 .all(|&v| v == 0)47 {48 return Err(Error::Error(ExitError::InvalidRange));49 }50 block.copy_from_slice(51 &self.buf[self.offset + ABI_ALIGNMENT - S..self.offset + ABI_ALIGNMENT],52 );53 self.offset += ABI_ALIGNMENT;54 Ok(block)55 }5657 pub fn address(&mut self) -> Result<H160> {58 Ok(H160(self.read_padleft()?))59 }6061 pub fn bool(&mut self) -> Result<bool> {62 let data: [u8; 1] = self.read_padleft()?;63 match data[0] {64 0 => Ok(false),65 1 => Ok(true),66 _ => Err(Error::Error(ExitError::InvalidRange)),67 }68 }6970 pub fn bytes4(&mut self) -> Result<[u8; 4]> {71 self.read_padleft()72 }7374 pub fn bytes(&mut self) -> Result<Vec<u8>> {75 let mut subresult = self.subresult()?;76 let length = subresult.read_usize()?;77 if subresult.buf.len() <= subresult.offset + length {78 return Err(Error::Error(ExitError::OutOfOffset));79 }80 Ok(subresult.buf[subresult.offset..subresult.offset + length].into())81 }82 pub fn string(&mut self) -> Result<string> {83 string::from_utf8(self.bytes()?).map_err(|_| Error::Error(ExitError::InvalidRange))84 }8586 pub fn uint32(&mut self) -> Result<u32> {87 Ok(u32::from_be_bytes(self.read_padleft()?))88 }8990 pub fn uint128(&mut self) -> Result<u128> {91 Ok(u128::from_be_bytes(self.read_padleft()?))92 }9394 pub fn uint256(&mut self) -> Result<U256> {95 let buf: [u8; 32] = self.read_padleft()?;96 Ok(U256::from_big_endian(&buf))97 }9899 pub fn uint64(&mut self) -> Result<u64> {100 Ok(u64::from_be_bytes(self.read_padleft()?))101 }102103 pub fn read_usize(&mut self) -> Result<usize> {104 Ok(usize::from_be_bytes(self.read_padleft()?))105 }106107 fn subresult(&mut self) -> Result<AbiReader<'i>> {108 let offset = self.read_usize()?;109 Ok(AbiReader {110 buf: self.buf,111 offset: offset + self.offset,112 })113 }114115 pub fn is_finished(&self) -> bool {116 self.buf.len() == self.offset117 }118}119120#[derive(Default)]121pub struct AbiWriter {122 static_part: Vec<u8>,123 dynamic_part: Vec<(usize, AbiWriter)>,124}125impl AbiWriter {126 pub fn new() -> Self {127 Self::default()128 }129 pub fn new_call(method_id: u32) -> Self {130 let mut val = Self::new();131 val.static_part.extend(&method_id.to_be_bytes());132 val133 }134135 fn write_padleft(&mut self, block: &[u8]) {136 assert!(block.len() <= ABI_ALIGNMENT);137 self.static_part138 .extend(&[0; ABI_ALIGNMENT][0..ABI_ALIGNMENT - block.len()]);139 self.static_part.extend(block);140 }141142 fn write_padright(&mut self, bytes: &[u8]) {143 assert!(bytes.len() <= ABI_ALIGNMENT);144 self.static_part.extend(bytes);145 self.static_part146 .extend(&[0; ABI_ALIGNMENT][0..ABI_ALIGNMENT - bytes.len()]);147 }148149 pub fn address(&mut self, address: &H160) {150 self.write_padleft(&address.0)151 }152153 pub fn bool(&mut self, value: &bool) {154 self.write_padleft(&[if *value { 1 } else { 0 }])155 }156157 pub fn uint8(&mut self, value: &u8) {158 self.write_padleft(&[*value])159 }160161 pub fn uint32(&mut self, value: &u32) {162 self.write_padleft(&u32::to_be_bytes(*value))163 }164165 pub fn uint128(&mut self, value: &u128) {166 self.write_padleft(&u128::to_be_bytes(*value))167 }168169 pub fn uint256(&mut self, value: &U256) {170 let mut out = [0; 32];171 value.to_big_endian(&mut out);172 self.write_padleft(&out)173 }174175 pub fn write_usize(&mut self, value: &usize) {176 self.write_padleft(&usize::to_be_bytes(*value))177 }178179 pub fn write_subresult(&mut self, result: Self) {180 self.dynamic_part.push((self.static_part.len(), result));181 182 self.write_padleft(&[]);183 }184185 pub fn memory(&mut self, value: &[u8]) {186 let mut sub = Self::new();187 sub.write_usize(&value.len());188 for chunk in value.chunks(ABI_ALIGNMENT) {189 sub.write_padright(chunk);190 }191 self.write_subresult(sub);192 }193194 pub fn string(&mut self, value: &str) {195 self.memory(value.as_bytes())196 }197198 pub fn finish(mut self) -> Vec<u8> {199 for (static_offset, part) in self.dynamic_part {200 let part_offset = self.static_part.len();201202 let encoded_dynamic_offset = usize::to_be_bytes(part_offset - static_offset);203 self.static_part[static_offset + ABI_ALIGNMENT - encoded_dynamic_offset.len()204 ..static_offset + ABI_ALIGNMENT]205 .copy_from_slice(&encoded_dynamic_offset);206 self.static_part.extend(part.finish())207 }208 self.static_part209 }210}211212pub trait AbiRead<T> {213 fn abi_read(&mut self) -> Result<T>;214}215216macro_rules! impl_abi_readable {217 ($ty:ty, $method:ident) => {218 impl AbiRead<$ty> for AbiReader<'_> {219 fn abi_read(&mut self) -> Result<$ty> {220 self.$method()221 }222 }223 };224}225226impl_abi_readable!(u32, uint32);227impl_abi_readable!(u128, uint128);228impl_abi_readable!(U256, uint256);229impl_abi_readable!(H160, address);230impl_abi_readable!(Vec<u8>, bytes);231impl_abi_readable!(bool, bool);232impl_abi_readable!(string, string);233234pub trait AbiWrite {235 fn abi_write(&self, writer: &mut AbiWriter);236}237238macro_rules! impl_abi_writeable {239 ($ty:ty, $method:ident) => {240 impl AbiWrite for $ty {241 fn abi_write(&self, writer: &mut AbiWriter) {242 writer.$method(&self)243 }244 }245 };246}247248impl_abi_writeable!(u8, uint8);249impl_abi_writeable!(u32, uint32);250impl_abi_writeable!(u128, uint128);251impl_abi_writeable!(U256, uint256);252impl_abi_writeable!(H160, address);253impl_abi_writeable!(bool, bool);254impl_abi_writeable!(&str, string);255impl AbiWrite for &string {256 fn abi_write(&self, writer: &mut AbiWriter) {257 writer.string(self)258 }259}260261impl AbiWrite for () {262 fn abi_write(&self, _writer: &mut AbiWriter) {}263}264265#[macro_export]266macro_rules! abi_decode {267 ($reader:expr, $($name:ident: $typ:ident),+ $(,)?) => {268 $(269 let $name = $reader.$typ()?;270 )+271 }272}273#[macro_export]274macro_rules! abi_encode {275 ($($typ:ident($value:expr)),* $(,)?) => {{276 #[allow(unused_mut)]277 let mut writer = ::evm_coder::abi::AbiWriter::new();278 $(279 writer.$typ($value);280 )*281 writer282 }};283 (call $val:expr; $($typ:ident($value:expr)),* $(,)?) => {{284 #[allow(unused_mut)]285 let mut writer = ::evm_coder::abi::AbiWriter::new_call($val);286 $(287 writer.$typ($value);288 )*289 writer290 }}291}