mirror of
https://github.com/denoland/deno.git
synced 2024-12-25 00:29:09 -05:00
f90f62fa52
Original: 395392912d
89 lines
2.5 KiB
TypeScript
89 lines
2.5 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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const { Buffer } = Deno;
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type Reader = Deno.Reader;
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type ReadResult = Deno.ReadResult;
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import { test } from "../testing/mod.ts";
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import { assertEquals } from "../testing/asserts.ts";
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import {
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copyN,
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readInt,
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readLong,
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readShort,
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sliceLongToBytes
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} from "./ioutil.ts";
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import { BufReader } from "./bufio.ts";
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import { stringsReader } from "./util.ts";
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class BinaryReader implements Reader {
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index = 0;
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constructor(private bytes: Uint8Array = new Uint8Array(0)) {}
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async read(p: Uint8Array): Promise<ReadResult> {
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p.set(this.bytes.subarray(this.index, p.byteLength));
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this.index += p.byteLength;
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return { nread: p.byteLength, eof: false };
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}
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}
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test(async function testReadShort() {
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const r = new BinaryReader(new Uint8Array([0x12, 0x34]));
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const short = await readShort(new BufReader(r));
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assertEquals(short, 0x1234);
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});
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test(async function testReadInt() {
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const r = new BinaryReader(new Uint8Array([0x12, 0x34, 0x56, 0x78]));
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const int = await readInt(new BufReader(r));
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assertEquals(int, 0x12345678);
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});
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test(async function testReadLong() {
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const r = new BinaryReader(
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new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78])
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);
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const long = await readLong(new BufReader(r));
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assertEquals(long, 0x1234567812345678);
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});
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test(async function testReadLong2() {
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const r = new BinaryReader(
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new Uint8Array([0, 0, 0, 0, 0x12, 0x34, 0x56, 0x78])
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);
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const long = await readLong(new BufReader(r));
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assertEquals(long, 0x12345678);
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});
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test(async function testSliceLongToBytes() {
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const arr = sliceLongToBytes(0x1234567890abcdef);
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const actual = readLong(new BufReader(new BinaryReader(new Uint8Array(arr))));
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const expected = readLong(
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new BufReader(
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new BinaryReader(
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new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef])
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)
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)
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);
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assertEquals(actual, expected);
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});
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test(async function testSliceLongToBytes2() {
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const arr = sliceLongToBytes(0x12345678);
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assertEquals(arr, [0, 0, 0, 0, 0x12, 0x34, 0x56, 0x78]);
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});
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test(async function testCopyN1() {
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const w = new Buffer();
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const r = stringsReader("abcdefghij");
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const n = await copyN(w, r, 3);
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assertEquals(n, 3);
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assertEquals(w.toString(), "abc");
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});
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test(async function testCopyN2() {
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const w = new Buffer();
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const r = stringsReader("abcdefghij");
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const n = await copyN(w, r, 11);
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assertEquals(n, 10);
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assertEquals(w.toString(), "abcdefghij");
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});
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