/
ioutil_test.ts
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/
ioutil_test.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";
import {
copyN,
readInt,
readLong,
readShort,
sliceLongToBytes,
} from "./ioutil.ts";
import { StringReader } from "./readers.ts";
import { BufReader } from "./bufio.ts";
import { Buffer } from "./buffer.ts";
class BinaryReader implements Deno.Reader {
index = 0;
constructor(private bytes: Uint8Array = new Uint8Array(0)) {}
read(p: Uint8Array): Promise<number | null> {
p.set(this.bytes.subarray(this.index, p.byteLength));
this.index += p.byteLength;
return Promise.resolve(p.byteLength);
}
}
Deno.test("testReadShort", async function () {
const r = new BinaryReader(new Uint8Array([0x12, 0x34]));
const short = await readShort(new BufReader(r));
assertEquals(short, 0x1234);
});
Deno.test("testReadInt", async function () {
const r = new BinaryReader(new Uint8Array([0x12, 0x34, 0x56, 0x78]));
const int = await readInt(new BufReader(r));
assertEquals(int, 0x12345678);
});
Deno.test("testReadLong", async function () {
const r = new BinaryReader(
new Uint8Array([0x00, 0x00, 0x00, 0x78, 0x12, 0x34, 0x56, 0x78]),
);
const long = await readLong(new BufReader(r));
assertEquals(long, 0x7812345678);
});
Deno.test("testReadLong2", async function () {
const r = new BinaryReader(
new Uint8Array([0, 0, 0, 0, 0x12, 0x34, 0x56, 0x78]),
);
const long = await readLong(new BufReader(r));
assertEquals(long, 0x12345678);
});
Deno.test("testSliceLongToBytes", function (): void {
const arr = sliceLongToBytes(0x1234567890abcdef);
const actual = readLong(new BufReader(new BinaryReader(new Uint8Array(arr))));
const expected = readLong(
new BufReader(
new BinaryReader(
new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef]),
),
),
);
assertEquals(actual, expected);
});
Deno.test("testSliceLongToBytes2", function (): void {
const arr = sliceLongToBytes(0x12345678);
assertEquals(arr, [0, 0, 0, 0, 0x12, 0x34, 0x56, 0x78]);
});
Deno.test("testCopyN1", async function () {
const w = new Buffer();
const r = new StringReader("abcdefghij");
const n = await copyN(r, w, 3);
assertEquals(n, 3);
assertEquals(new TextDecoder().decode(w.bytes()), "abc");
});
Deno.test("testCopyN2", async function () {
const w = new Buffer();
const r = new StringReader("abcdefghij");
const n = await copyN(r, w, 11);
assertEquals(n, 10);
assertEquals(new TextDecoder().decode(w.bytes()), "abcdefghij");
});
Deno.test("copyNWriteAllData", async function () {
const tmpDir = await Deno.makeTempDir();
const filepath = `${tmpDir}/data`;
const file = await Deno.open(filepath, { create: true, write: true });
const size = 16 * 1024 + 1;
const data = "a".repeat(32 * 1024);
const r = new StringReader(data);
const n = await copyN(r, file, size); // Over max file possible buffer
file.close();
await Deno.remove(filepath);
assertEquals(n, size);
});
Deno.test("testStringReaderEof", async function () {
const r = new StringReader("abc");
assertEquals(await r.read(new Uint8Array()), 0);
assertEquals(await r.read(new Uint8Array(4)), 3);
assertEquals(await r.read(new Uint8Array(1)), null);
});