wehub-resource-sync
48 lines
1.7 KiB
JavaScript
48 lines
1.7 KiB
JavaScript
import { readFileSync, existsSync } from "node:fs";
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/**
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* Validates that a file starts with a known native-binary magic number.
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* Returns the platform label ("elf" | "macho" | "macho-le" | "macho-fat" | "pe")
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* or null if unrecognized / missing / unreadable.
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*
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*/
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export function validateBinaryMagic(path) {
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if (!existsSync(path)) return null;
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let buf;
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try {
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buf = readFileSync(path, { encoding: null }).subarray(0, 16);
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} catch {
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return null;
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}
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if (buf.length < 4) return null;
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// ELF: 7F 45 4C 46
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if (buf[0] === 0x7f && buf[1] === 0x45 && buf[2] === 0x4c && buf[3] === 0x46) return "elf";
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// Mach-O big-endian: FE ED FA CF (64-bit) / FE ED FA CE (32-bit)
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if (buf[0] === 0xfe && buf[1] === 0xed && buf[2] === 0xfa && buf[3] === 0xcf) return "macho";
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if (buf[0] === 0xfe && buf[1] === 0xed && buf[2] === 0xfa && buf[3] === 0xce) return "macho";
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// Mach-O little-endian: CF FA ED FE (64-bit) / CE FA ED FE (32-bit)
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if (buf[0] === 0xcf && buf[1] === 0xfa && buf[2] === 0xed && buf[3] === 0xfe) return "macho-le";
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if (buf[0] === 0xce && buf[1] === 0xfa && buf[2] === 0xed && buf[3] === 0xfe) return "macho-le";
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// Mach-O fat (universal binary): CA FE BA BE
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if (buf[0] === 0xca && buf[1] === 0xfe && buf[2] === 0xba && buf[3] === 0xbe) return "macho-fat";
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// PE (Windows .node — DLL): MZ at offset 0
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if (buf[0] === 0x4d && buf[1] === 0x5a) return "pe";
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return null;
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}
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/**
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* Returns the expected magic label for the current platform.
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* Used to validate that a runtime-installed binary matches this OS.
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*/
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export function platformBinaryLabel() {
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if (process.platform === "win32") return "pe";
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if (process.platform === "darwin") return "macho";
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return "elf";
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}
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