gsc-executor-common 0.35.0

A set of common definitions that are needed for defining execution engines.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

//! Utilities used by all backends

use crate::error::Result;
use sp_wasm_interface::Pointer;

/// Provides safe memory access interface using an external buffer
pub trait MemoryTransfer {
    /// Read data from a slice of memory into a newly allocated buffer.
    ///
    /// Returns an error if the read would go out of the memory bounds.
    fn read(&self, source_addr: Pointer<u8>, size: usize) -> Result<Vec<u8>>;

    /// Read data from a slice of memory into a destination buffer.
    ///
    /// Returns an error if the read would go out of the memory bounds.
    fn read_into(&self, source_addr: Pointer<u8>, destination: &mut [u8]) -> Result<()>;

    /// Write data to a slice of memory.
    ///
    /// Returns an error if the write would go out of the memory bounds.
    fn write_from(&self, dest_addr: Pointer<u8>, source: &[u8]) -> Result<()>;
}