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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import {  assertEquals,  assertMatch,  assertStrictEquals,} from "../../testing/asserts.ts";import { read, readSync } from "./_fs_read.ts";import { open, openSync } from "./_fs_open.ts";import { Buffer } from "../buffer.ts";import * as path from "../../path/mod.ts";import { closeSync } from "./_fs_close.ts";
async function readTest(  testData: string,  buffer: Buffer | Uint8Array,  offset: number,  length: number,  position: number | null = null,  expected: (    fd: number,    bytesRead: number | null,    data: Buffer | undefined,  ) => void,) {  let fd1 = 0;  await new Promise<{    fd: number;    bytesRead: number | null;    data: Buffer | undefined;  }>((resolve, reject) => {    open(testData, "r", (err, fd) => {      if (err) reject(err);      read(fd, buffer, offset, length, position, (err, bytesRead, data) => {        if (err) reject(err);        resolve({ fd, bytesRead, data });      });    });  })    .then(({ fd, bytesRead, data }) => {      fd1 = fd;      expected(fd, bytesRead, data);    })    .finally(() => closeSync(fd1));}
Deno.test({  name: "readSuccess",  async fn() {    const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));    const testData = path.resolve(moduleDir, "testdata", "hello.txt");    const buf = Buffer.alloc(1024);    await readTest(      testData,      buf,      buf.byteOffset,      buf.byteLength,      null,      (_fd, bytesRead, data) => {        assertStrictEquals(bytesRead, 11);        assertEquals(data instanceof Buffer, true);        assertMatch((data as Buffer).toString(), /hello world/);      },    );  },});
Deno.test({  name:    "[std/node/fs] Read only five bytes, so that the position moves to five",  async fn() {    const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));    const testData = path.resolve(moduleDir, "testdata", "hello.txt");    const buf = Buffer.alloc(5);    await readTest(      testData,      buf,      buf.byteOffset,      5,      null,      (_fd, bytesRead, data) => {        assertStrictEquals(bytesRead, 5);        assertEquals(data instanceof Buffer, true);        assertEquals((data as Buffer).toString(), "hello");      },    );  },});
Deno.test({  name:    "[std/node/fs] position option of fs.read() specifies where to begin reading from in the file",  async fn() {    const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));    const testData = path.resolve(moduleDir, "testdata", "hello.txt");    const fd = openSync(testData);    const buf = Buffer.alloc(5);    const positions = [6, 0, -1, null];    const expected = [      [119, 111, 114, 108, 100],      [104, 101, 108, 108, 111],      [104, 101, 108, 108, 111],      [32, 119, 111, 114, 108],    ];    for (const [i, position] of positions.entries()) {      await new Promise((resolve) => {        read(          fd,          {            buffer: buf,            offset: buf.byteOffset,            length: buf.byteLength,            position,          },          (err, bytesRead, data) => {            assertEquals(err, null);            assertStrictEquals(bytesRead, 5);            assertEquals(              data,              Buffer.from(expected[i]),            );            return resolve(true);          },        );      });    }    closeSync(fd);  },});
Deno.test({  name: "[std/node/fs] Read fs.read(fd, options, cb) signature",  async fn() {    const file = Deno.makeTempFileSync();    Deno.writeTextFileSync(file, "hi there");    const fd = openSync(file, "r+");    const buf = Buffer.alloc(11);    await read(      fd,      {        buffer: buf,        offset: buf.byteOffset,        length: buf.byteLength,        position: null,      },      (err, bytesRead, data) => {        assertEquals(err, null);        assertStrictEquals(bytesRead, 8);        assertEquals(          data,          Buffer.from([104, 105, 32, 116, 104, 101, 114, 101, 0, 0, 0]),        );      },    );    closeSync(fd);  },});
Deno.test({  name: "[std/node/fs] Read fs.read(fd, cb) signature",  async fn() {    const file = Deno.makeTempFileSync();    Deno.writeTextFileSync(file, "hi deno");    const fd = openSync(file, "r+");    await read(fd, (err, bytesRead, data) => {      assertEquals(err, null);      assertStrictEquals(bytesRead, 7);      assertStrictEquals(data?.byteLength, 16384);    });    closeSync(fd);  },});
Deno.test({  name: "SYNC: readSuccess",  fn() {    const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));    const testData = path.resolve(moduleDir, "testdata", "hello.txt");    const buffer = Buffer.alloc(1024);    const fd = openSync(testData);    const bytesRead = readSync(      fd,      buffer,      buffer.byteOffset,      buffer.byteLength,      null,    );    assertStrictEquals(bytesRead, 11);    closeSync(fd);  },});
Deno.test({  name: "[std/node/fs] Read only two bytes, so that the position moves to two",  fn() {    const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));    const testData = path.resolve(moduleDir, "testdata", "hello.txt");    const buffer = Buffer.alloc(2);    const fd = openSync(testData);    const bytesRead = readSync(fd, buffer, buffer.byteOffset, 2, null);    assertStrictEquals(bytesRead, 2);    closeSync(fd);  },});
Deno.test({  name:    "[std/node/fs] position option of fs.readSync() specifies where to begin reading from in the file",  fn() {    const moduleDir = path.dirname(path.fromFileUrl(import.meta.url));    const testData = path.resolve(moduleDir, "testdata", "hello.txt");    const fd = openSync(testData);    const buf = Buffer.alloc(5);    const positions = [6, 0, -1, null];    const expected = [      [119, 111, 114, 108, 100],      [104, 101, 108, 108, 111],      [104, 101, 108, 108, 111],      [32, 119, 111, 114, 108],    ];    for (const [i, position] of positions.entries()) {      const bytesRead = readSync(        fd,        buf,        buf.byteOffset,        buf.byteLength,        position,      );      assertStrictEquals(bytesRead, 5);      assertEquals(        buf,        Buffer.from(expected[i]),      );    }    closeSync(fd);  },});
Deno.test({  name: "[std/node/fs] Read fs.readSync(fd, buffer[, options]) signature",  fn() {    const file = Deno.makeTempFileSync();    Deno.writeTextFileSync(file, "hello deno");    const buffer = Buffer.alloc(1024);    const fd = openSync(file, "r+");    const bytesRead = readSync(fd, buffer, {      length: buffer.byteLength,      offset: buffer.byteOffset,      position: null,    });    assertStrictEquals(bytesRead, 10);    closeSync(fd);  },});