alexion
6081e3e325
Imported as a linear vendor commit so forge rebases do not replay the upstream root tree. git-subtree-dir: third_party/pi git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0
73 lines
2.4 KiB
TypeScript
73 lines
2.4 KiB
TypeScript
import { writeFile } from "node:fs/promises";
|
|
import { crc32, deflateRawSync } from "node:zlib";
|
|
|
|
interface ZipEntry {
|
|
name: string;
|
|
data: string | Uint8Array;
|
|
}
|
|
|
|
function dosDateTime(date: Date): { time: number; day: number } {
|
|
return {
|
|
time: (date.getHours() << 11) | (date.getMinutes() << 5) | (date.getSeconds() >> 1),
|
|
day: ((Math.max(1980, date.getFullYear()) - 1980) << 9) | ((date.getMonth() + 1) << 5) | date.getDate(),
|
|
};
|
|
}
|
|
|
|
/** Create the small, classic ZIP archives used by bug reports. */
|
|
function createZipArchive(entries: readonly ZipEntry[]): Buffer {
|
|
const files: Buffer[] = [];
|
|
const directory: Buffer[] = [];
|
|
const { time, day } = dosDateTime(new Date());
|
|
let offset = 0;
|
|
|
|
for (const entry of entries) {
|
|
const name = Buffer.from(entry.name);
|
|
const data = typeof entry.data === "string" ? Buffer.from(entry.data) : Buffer.from(entry.data);
|
|
const compressed = deflateRawSync(data);
|
|
const checksum = crc32(data);
|
|
|
|
const local = Buffer.alloc(30);
|
|
local.writeUInt32LE(0x04034b50, 0);
|
|
local.writeUInt16LE(20, 4);
|
|
local.writeUInt16LE(0x0800, 6);
|
|
local.writeUInt16LE(8, 8);
|
|
local.writeUInt16LE(time, 10);
|
|
local.writeUInt16LE(day, 12);
|
|
local.writeUInt32LE(checksum, 14);
|
|
local.writeUInt32LE(compressed.length, 18);
|
|
local.writeUInt32LE(data.length, 22);
|
|
local.writeUInt16LE(name.length, 26);
|
|
|
|
const central = Buffer.alloc(46);
|
|
central.writeUInt32LE(0x02014b50, 0);
|
|
central.writeUInt16LE(20, 4);
|
|
central.writeUInt16LE(20, 6);
|
|
central.writeUInt16LE(0x0800, 8);
|
|
central.writeUInt16LE(8, 10);
|
|
central.writeUInt16LE(time, 12);
|
|
central.writeUInt16LE(day, 14);
|
|
central.writeUInt32LE(checksum, 16);
|
|
central.writeUInt32LE(compressed.length, 20);
|
|
central.writeUInt32LE(data.length, 24);
|
|
central.writeUInt16LE(name.length, 28);
|
|
central.writeUInt32LE(offset, 42);
|
|
|
|
files.push(local, name, compressed);
|
|
directory.push(central, name);
|
|
offset += local.length + name.length + compressed.length;
|
|
}
|
|
|
|
const centralDirectory = Buffer.concat(directory);
|
|
const end = Buffer.alloc(22);
|
|
end.writeUInt32LE(0x06054b50, 0);
|
|
end.writeUInt16LE(entries.length, 8);
|
|
end.writeUInt16LE(entries.length, 10);
|
|
end.writeUInt32LE(centralDirectory.length, 12);
|
|
end.writeUInt32LE(offset, 16);
|
|
return Buffer.concat([...files, centralDirectory, end]);
|
|
}
|
|
|
|
export function writeZipArchive(filePath: string, entries: readonly ZipEntry[]): Promise<void> {
|
|
return writeFile(filePath, createZipArchive(entries));
|
|
}
|