Jerry
92 lines
3.0 KiB
TypeScript
92 lines
3.0 KiB
TypeScript
import assert from "node:assert/strict";
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import test from "node:test";
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import { BASE_LIMITS, preflightZipBytes } from "../src/index.js";
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function declaredDeflateZip(
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compressed: Uint8Array,
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uncompressedSize: number,
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localUncompressedSize = uncompressedSize,
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): Buffer {
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const name = Buffer.from("scene.json", "ascii");
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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(0, 10);
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local.writeUInt16LE(0x0021, 12);
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local.writeUInt32LE(0, 14);
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local.writeUInt32LE(compressed.byteLength, 18);
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local.writeUInt32LE(localUncompressedSize, 22);
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local.writeUInt16LE(name.length, 26);
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local.writeUInt16LE(0, 28);
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const centralOffset = local.length + name.length + compressed.byteLength;
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const central = Buffer.alloc(46);
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central.writeUInt32LE(0x02014b50, 0);
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central.writeUInt16LE(0x0314, 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(0, 12);
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central.writeUInt16LE(0x0021, 14);
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central.writeUInt32LE(0, 16);
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central.writeUInt32LE(compressed.byteLength, 20);
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central.writeUInt32LE(uncompressedSize, 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(0x81a40000, 38);
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central.writeUInt32LE(0, 42);
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const eocd = Buffer.alloc(22);
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eocd.writeUInt32LE(0x06054b50, 0);
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eocd.writeUInt16LE(0, 4);
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eocd.writeUInt16LE(0, 6);
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eocd.writeUInt16LE(1, 8);
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eocd.writeUInt16LE(1, 10);
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eocd.writeUInt32LE(central.length + name.length, 12);
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eocd.writeUInt32LE(centralOffset, 16);
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eocd.writeUInt16LE(0, 20);
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return Buffer.concat([local, name, compressed, central, name, eocd]);
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}
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function assertError(archive: Uint8Array, expected: string): void {
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assert.throws(() => preflightZipBytes(archive), (error) => {
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assert.equal((error as Error).message, expected);
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return true;
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});
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}
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test("aggregate ratio uses cross-checked declarations before inflate", () => {
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const compressed = Buffer.from([0]);
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const template = declaredDeflateZip(compressed, 0);
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const exactSize = template.length * BASE_LIMITS.compression_ratio;
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assertError(
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declaredDeflateZip(compressed, exactSize),
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'member compression ratio exceeds limit: "scene.json"',
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);
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assertError(
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declaredDeflateZip(compressed, exactSize + 1),
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"aggregate compression ratio exceeds limit",
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);
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assertError(
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declaredDeflateZip(compressed, exactSize + 1, exactSize),
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"ZIP central/local header mismatch",
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);
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});
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test("zero compressed size uses one as the member ratio denominator", () => {
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assertError(
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declaredDeflateZip(Buffer.alloc(0), BASE_LIMITS.compression_ratio),
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'invalid deflate stream: "scene.json"',
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);
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assertError(
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declaredDeflateZip(Buffer.alloc(0), BASE_LIMITS.compression_ratio + 1),
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'member compression ratio exceeds limit: "scene.json"',
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);
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});
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