@bugsplat/elfy/dist/src/file-header.js

Tiny utility for parsing ELF/SELF files.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ElfFileHeader = exports.lengthOf64BitElfHeader = void 0;
exports.lengthOf64BitElfHeader = 64;
const elfMagic = [0x7f, 0x45, 0x4c, 0x46];
class ElfFileHeader {
    constructor(segmentHeaderOffset, sectionHeaderOffset, segmentHeaderSize, segmentHeaderEntrySize, segmentHeaderEntryCount, sectionHeaderEntrySize, sectionHeaderEntryCount, stringTableIndex) {
        this.segmentHeaderOffset = segmentHeaderOffset;
        this.sectionHeaderOffset = sectionHeaderOffset;
        this.segmentHeaderSize = segmentHeaderSize;
        this.segmentHeaderEntrySize = segmentHeaderEntrySize;
        this.segmentHeaderEntryCount = segmentHeaderEntryCount;
        this.sectionHeaderEntrySize = sectionHeaderEntrySize;
        this.sectionHeaderEntryCount = sectionHeaderEntryCount;
        this.stringTableIndex = stringTableIndex;
    }
    static parse(buffer) {
        if (buffer.length < exports.lengthOf64BitElfHeader) {
            throw new Error('Could not parse ELF header, invalid buffer!');
        }
        const expected = Buffer.from(elfMagic);
        const isElf = Buffer.compare(buffer.subarray(0, 4), expected) === 0;
        if (!isElf) {
            throw new Error('Could not parse ELF header, invalid ELF file!');
        }
        const is64Bit = Buffer.compare(buffer.subarray(4, 5), Buffer.from([0x02])) === 0;
        if (!is64Bit) {
            throw new Error('Could not parse ELF header, 32-bit ELF files are not supported!');
        }
        const isLE = Buffer.compare(buffer.subarray(5, 6), Buffer.from([0x01])) === 0;
        if (!isLE) {
            throw new Error('Could not parse ELF header, big endian is not supported!');
        }
        const segmentHeaderOffset = buffer.readBigUInt64LE(32);
        const sectionHeaderOffset = buffer.readBigUInt64LE(40);
        const segmentHeaderSize = buffer.readUint16LE(52);
        const segmentHeaderEntrySize = buffer.readUint16LE(54);
        const segmentHeaderEntryCount = buffer.readUint16LE(56);
        const sectionHeaderEntrySize = buffer.readUint16LE(58);
        const sectionHeaderEntryCount = buffer.readUint16LE(60);
        const stringTableIndex = buffer.readUint16LE(62);
        return new ElfFileHeader(segmentHeaderOffset, sectionHeaderOffset, segmentHeaderSize, segmentHeaderEntrySize, segmentHeaderEntryCount, sectionHeaderEntrySize, sectionHeaderEntryCount, stringTableIndex);
    }
}
exports.ElfFileHeader = ElfFileHeader;
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