40 lines
982 B
JavaScript
Executable File
40 lines
982 B
JavaScript
Executable File
// Copyright 2017 Lovell Fuller and others.
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
'use strict';
|
|
|
|
const interpreterPath = (elf) => {
|
|
if (elf.length < 64) {
|
|
return null;
|
|
}
|
|
if (elf.readUInt32BE(0) !== 0x7F454C46) {
|
|
// Unexpected magic bytes
|
|
return null;
|
|
}
|
|
if (elf.readUInt8(4) !== 2) {
|
|
// Not a 64-bit ELF
|
|
return null;
|
|
}
|
|
if (elf.readUInt8(5) !== 1) {
|
|
// Not little-endian
|
|
return null;
|
|
}
|
|
const offset = elf.readUInt32LE(32);
|
|
const size = elf.readUInt16LE(54);
|
|
const count = elf.readUInt16LE(56);
|
|
for (let i = 0; i < count; i++) {
|
|
const headerOffset = offset + (i * size);
|
|
const type = elf.readUInt32LE(headerOffset);
|
|
if (type === 3) {
|
|
const fileOffset = elf.readUInt32LE(headerOffset + 8);
|
|
const fileSize = elf.readUInt32LE(headerOffset + 32);
|
|
return elf.subarray(fileOffset, fileOffset + fileSize).toString().replace(/\0.*$/g, '');
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
module.exports = {
|
|
interpreterPath
|
|
};
|