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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals, DENO_FUTURE } from "./test_util.ts";
import { Buffer } from "@std/io/buffer";
const DEFAULT_BUF_SIZE = 32 * 1024;
type Spy = { calls: number };
function repeat(c: string, bytes: number): Uint8Array {
assertEquals(c.length, 1);
const ui8 = new Uint8Array(bytes);
ui8.fill(c.charCodeAt(0));
return ui8;
}
function spyRead(obj: Buffer): Spy {
const spy: Spy = {
calls: 0,
};
const orig = obj.read.bind(obj);
obj.read = (p: Uint8Array): Promise<number | null> => {
spy.calls++;
return orig(p);
};
return spy;
}
Deno.test({ ignore: DENO_FUTURE }, async function copyWithDefaultBufferSize() {
const xBytes = repeat("b", DEFAULT_BUF_SIZE);
const reader = new Buffer(xBytes.buffer as ArrayBuffer);
const write = new Buffer();
const readSpy = spyRead(reader);
// deno-lint-ignore no-deprecated-deno-api
const n = await Deno.copy(reader, write);
assertEquals(n, xBytes.length);
assertEquals(write.length, xBytes.length);
assertEquals(readSpy.calls, 2); // read with DEFAULT_BUF_SIZE bytes + read with 0 bytes
});
Deno.test({ ignore: DENO_FUTURE }, async function copyWithCustomBufferSize() {
const bufSize = 1024;
const xBytes = repeat("b", DEFAULT_BUF_SIZE);
const reader = new Buffer(xBytes.buffer as ArrayBuffer);
const write = new Buffer();
const readSpy = spyRead(reader);
// deno-lint-ignore no-deprecated-deno-api
const n = await Deno.copy(reader, write, { bufSize });
assertEquals(n, xBytes.length);
assertEquals(write.length, xBytes.length);
assertEquals(readSpy.calls, DEFAULT_BUF_SIZE / bufSize + 1);
});
Deno.test(
{ ignore: DENO_FUTURE, permissions: { write: true } },
async function copyBufferToFile() {
const filePath = "test-file.txt";
// bigger than max File possible buffer 16kb
const bufSize = 32 * 1024;
const xBytes = repeat("b", bufSize);
const reader = new Buffer(xBytes.buffer as ArrayBuffer);
const write = await Deno.open(filePath, { write: true, create: true });
// deno-lint-ignore no-deprecated-deno-api
const n = await Deno.copy(reader, write, { bufSize });
assertEquals(n, xBytes.length);
write.close();
await Deno.remove(filePath);
},
);
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