chore(vendor): import pi 1.3.0

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

third_party/pi/packages/coding-agent/src/utils/zip.ts

@@ -0,0 +1,72 @@
+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));
+}