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// Copyright 2018-2022 Parity Technologies (UK) Ltd. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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use crate::call::Selector; | ||
use ink_prelude::{ | ||
vec, | ||
vec::Vec, | ||
}; | ||
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/// The raw ABI respecting input data to a call. | ||
/// | ||
/// # Note | ||
/// | ||
/// The first four bytes are the function selector and the rest are SCALE encoded inputs. | ||
#[derive(Debug, Clone, PartialEq, Eq)] | ||
pub struct CallData { | ||
/// Already encoded function selector and inputs. | ||
/// | ||
/// # Note | ||
/// | ||
/// Has the invariant of always holding at least 4 bytes (the selector). | ||
bytes: Vec<u8>, | ||
} | ||
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impl CallData { | ||
/// Creates new call ABI data for the given selector. | ||
pub fn new(selector: Selector) -> Self { | ||
let bytes = selector.to_bytes(); | ||
Self { | ||
bytes: vec![bytes[0], bytes[1], bytes[2], bytes[3]], | ||
} | ||
} | ||
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/// Pushes the given argument onto the call ABI data in encoded form. | ||
pub fn push_arg<A>(&mut self, arg: &A) | ||
where | ||
A: scale::Encode, | ||
{ | ||
arg.encode_to(&mut self.bytes) | ||
} | ||
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/// Returns the selector of `self`. | ||
pub fn selector(&self) -> Selector { | ||
debug_assert!(self.bytes.len() >= 4); | ||
let bytes = [self.bytes[0], self.bytes[1], self.bytes[2], self.bytes[3]]; | ||
bytes.into() | ||
} | ||
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/// Returns the underlying bytes of the encoded input parameters. | ||
pub fn params(&self) -> &[u8] { | ||
debug_assert!(self.bytes.len() >= 4); | ||
&self.bytes[4..] | ||
} | ||
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/// Returns the underlying byte representation. | ||
pub fn to_bytes(&self) -> &[u8] { | ||
&self.bytes | ||
} | ||
} | ||
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impl scale::Encode for CallData { | ||
fn size_hint(&self) -> usize { | ||
self.bytes.len() | ||
} | ||
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fn encode_to<T: scale::Output + ?Sized>(&self, dest: &mut T) { | ||
dest.write(self.bytes.as_slice()); | ||
} | ||
} | ||
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impl scale::Decode for CallData { | ||
fn decode<I: scale::Input>( | ||
input: &mut I, | ||
) -> core::result::Result<Self, scale::Error> { | ||
let remaining_len = input.remaining_len().unwrap_or(None).unwrap_or(0); | ||
let mut bytes = Vec::with_capacity(remaining_len); | ||
while let Ok(byte) = input.read_byte() { | ||
bytes.push(byte); | ||
} | ||
if bytes.len() < 4 { | ||
return Err(scale::Error::from( | ||
"require at least 4 bytes for input data", | ||
)) | ||
} | ||
Ok(Self { bytes }) | ||
} | ||
} |
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