Masterluke77andGitHub
6f48827f4d
* docs: prepare Vendoo 1.41.2 git-ignore boundary hotfix * fix: track native source modules with root-anchored runtime ignores
90 lines
2.9 KiB
JavaScript
90 lines
2.9 KiB
JavaScript
import { deflateRawSync } from 'zlib';
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const CRC_TABLE = (() => {
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const table = new Uint32Array(256);
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for (let n = 0; n < 256; n++) {
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let c = n;
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for (let k = 0; k < 8; k++) c = (c & 1) ? (0xedb88320 ^ (c >>> 1)) : (c >>> 1);
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table[n] = c >>> 0;
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}
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return table;
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})();
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function crc32(buffer) {
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let crc = 0xffffffff;
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for (const byte of buffer) crc = CRC_TABLE[(crc ^ byte) & 0xff] ^ (crc >>> 8);
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return (crc ^ 0xffffffff) >>> 0;
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}
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function dosDateTime(date = new Date()) {
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const year = Math.max(1980, date.getFullYear());
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const time = (date.getHours() << 11) | (date.getMinutes() << 5) | Math.floor(date.getSeconds() / 2);
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const day = date.getDate();
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const month = date.getMonth() + 1;
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const dosDate = ((year - 1980) << 9) | (month << 5) | day;
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return { time, date: dosDate };
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}
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export function createZip(files) {
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const localParts = [];
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const centralParts = [];
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let offset = 0;
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const stamp = dosDateTime();
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for (const file of files) {
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const name = Buffer.from(String(file.name || 'file.bin').replace(/\\/g, '/'), 'utf8');
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const data = Buffer.isBuffer(file.data) ? file.data : Buffer.from(file.data || '');
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const compressed = deflateRawSync(data, { level: 6 });
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const crc = crc32(data);
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const local = Buffer.alloc(30);
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local.writeUInt32LE(0x04034b50, 0);
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local.writeUInt16LE(20, 4);
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local.writeUInt16LE(0x0800, 6);
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local.writeUInt16LE(8, 8);
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local.writeUInt16LE(stamp.time, 10);
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local.writeUInt16LE(stamp.date, 12);
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local.writeUInt32LE(crc, 14);
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local.writeUInt32LE(compressed.length, 18);
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local.writeUInt32LE(data.length, 22);
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local.writeUInt16LE(name.length, 26);
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local.writeUInt16LE(0, 28);
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localParts.push(local, name, compressed);
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const central = Buffer.alloc(46);
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central.writeUInt32LE(0x02014b50, 0);
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central.writeUInt16LE(20, 4);
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central.writeUInt16LE(20, 6);
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central.writeUInt16LE(0x0800, 8);
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central.writeUInt16LE(8, 10);
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central.writeUInt16LE(stamp.time, 12);
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central.writeUInt16LE(stamp.date, 14);
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central.writeUInt32LE(crc, 16);
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central.writeUInt32LE(compressed.length, 20);
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central.writeUInt32LE(data.length, 24);
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central.writeUInt16LE(name.length, 28);
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central.writeUInt16LE(0, 30);
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central.writeUInt16LE(0, 32);
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central.writeUInt16LE(0, 34);
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central.writeUInt16LE(0, 36);
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central.writeUInt32LE(0, 38);
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central.writeUInt32LE(offset, 42);
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centralParts.push(central, name);
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offset += local.length + name.length + compressed.length;
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}
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const centralDirectory = Buffer.concat(centralParts);
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const end = Buffer.alloc(22);
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end.writeUInt32LE(0x06054b50, 0);
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end.writeUInt16LE(0, 4);
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end.writeUInt16LE(0, 6);
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end.writeUInt16LE(files.length, 8);
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end.writeUInt16LE(files.length, 10);
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end.writeUInt32LE(centralDirectory.length, 12);
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end.writeUInt32LE(offset, 16);
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end.writeUInt16LE(0, 20);
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return Buffer.concat([...localParts, centralDirectory, end]);
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}
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