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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// deno-lint-ignore-file no-console
import { write, writeSync } from "node:fs";
import { assertEquals } from "@std/assert";
import { Buffer } from "node:buffer";
const decoder = new TextDecoder("utf-8");
Deno.test({
name: "Data is written to the file with the correct length",
async fn() {
const tempFile: string = await Deno.makeTempFile();
using file = await Deno.open(tempFile, {
create: true,
write: true,
read: true,
});
const buffer = Buffer.from("hello world");
const bytesWrite = await new Promise((resolve, reject) => {
write(file.rid, buffer, 0, 5, (err: unknown, nwritten: number) => {
if (err) return reject(err);
resolve(nwritten);
});
});
const data = await Deno.readFile(tempFile);
await Deno.remove(tempFile);
assertEquals(bytesWrite, 5);
assertEquals(decoder.decode(data), "hello");
},
});
Deno.test({
name: "Data is written synchronously to the file with the correct length",
fn() {
const tempFile: string = Deno.makeTempFileSync();
using file = Deno.openSync(tempFile, {
create: true,
write: true,
read: true,
});
const buffer = Buffer.from("hello world");
const bytesWrite = writeSync(file.rid, buffer, 0, 5);
const data = Deno.readFileSync(tempFile);
Deno.removeSync(tempFile);
assertEquals(bytesWrite, 5);
assertEquals(decoder.decode(data), "hello");
},
});
Deno.test({
name: "Data is padded if position > length",
async fn() {
const tempFile: string = Deno.makeTempFileSync();
using file = await Deno.open(tempFile, {
create: true,
write: true,
read: true,
});
const str = "hello world";
const buffer = Buffer.from(str);
const bytesWritten = writeSync(file.rid, buffer, 0, str.length, 4);
const data = Deno.readFileSync(tempFile);
Deno.removeSync(tempFile);
assertEquals(bytesWritten, str.length);
// Check if result is padded
assertEquals(decoder.decode(data), "\x00\x00\x00\x00hello world");
},
});
Deno.test({
name: "write with offset TypedArray buffers",
async fn() {
const tempFile: string = Deno.makeTempFileSync();
using file = Deno.openSync(tempFile, {
create: true,
write: true,
read: true,
});
const arrayBuffer = new ArrayBuffer(128);
const resetBuffer = () => {
new Uint8Array(arrayBuffer).fill(0);
};
const bufConstructors = [
Int8Array,
Uint8Array,
];
const offsets = [0, 24, 48];
const bytes = [0, 1, 2, 3, 4];
for (const constr of bufConstructors) {
// test combinations of buffers internally offset from their backing array buffer,
// and also offset in the write call
for (const innerOffset of offsets) {
for (const offset of offsets) {
resetBuffer();
const buffer = new constr(
arrayBuffer,
innerOffset,
offset + bytes.length,
);
for (let i = 0; i < bytes.length; i++) {
buffer[offset + i] = i;
}
let nWritten = writeSync(file.rid, buffer, offset, bytes.length, 0);
let data = Deno.readFileSync(tempFile);
assertEquals(nWritten, bytes.length);
console.log(constr, innerOffset, offset);
assertEquals(data, new Uint8Array(bytes));
nWritten = await new Promise((resolve, reject) =>
write(
file.rid,
buffer,
offset,
bytes.length,
0,
(err: unknown, nwritten: number) => {
if (err) return reject(err);
resolve(nwritten);
},
)
);
data = Deno.readFileSync(tempFile);
assertEquals(nWritten, 5);
assertEquals(data, new Uint8Array(bytes));
}
}
}
},
});
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