packages/util/src/is/riscv.ts
// Copyright 2017-2024 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0
import { u8aEq } from '../u8a/eq.js';
import { isU8a } from './u8a.js';
// general elf header
const ELF_MAGIC = new Uint8Array([0x7f, 0x45, 0x4c, 0x46]); // ELF magic bytes: 0x7f, 'E', 'L', 'F'
// contract-specific PVM header
const PVM_MAGIC = new Uint8Array([0x50, 0x56, 0x4d, 0x00]); // 'P', 'V', 'M', 0x00
/**
* @name isRiscV
* @summary Tests if the input has a RISC-V header
* @description
* Checks to see if the input Uint8Array contains a valid RISC-V header
*/
export function isRiscV (bytes: unknown): bytes is Uint8Array {
if (isU8a(bytes)) {
const start = bytes.subarray(0, 4);
return u8aEq(start, PVM_MAGIC) || u8aEq(start, ELF_MAGIC);
}
return false;
}