1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// META: script=/resources/test-only-api.js
// META: script=/serial/resources/common.js
// META: script=resources/automation.js
async function readInto(reader, buffer) {
let offset = 0;
while (offset < buffer.byteLength) {
const {value: view, done} =
await reader.read(new Uint8Array(buffer, offset));
buffer = view.buffer;
if (done) {
break;
}
offset += view.byteLength;
}
return buffer;
}
serial_test(async (t, fake) => {
const {port, fakePort} = await getFakeSerialPort(fake);
const bufferSize = 1024;
await port.open({baudRate: 9600, bufferSize});
const reader = port.readable.getReader({mode: 'byob'});
assert_true(reader instanceof ReadableStreamBYOBReader);
await fakePort.writable();
const data = new Uint8Array(bufferSize);
for (let i = 0; i < data.byteLength; ++i)
data[i] = i & 0xff;
fakePort.write(data);
let buffer = new ArrayBuffer(512);
buffer = await readInto(reader, buffer);
assert_equals(512, buffer.byteLength, 'original size retained');
compareArrays(data.subarray(0, 512), new Uint8Array(buffer));
buffer = await readInto(reader, buffer);
assert_equals(512, buffer.byteLength, 'original size retained');
compareArrays(data.subarray(512), new Uint8Array(buffer));
reader.releaseLock();
await port.close();
}, 'Can read specific subsets of the available data');
serial_test(async (t, fake) => {
const {port, fakePort} = await getFakeSerialPort(fake);
await port.open({baudRate: 9600, bufferSize: 64});
const reader = port.readable.getReader({mode: 'byob'});
assert_true(reader instanceof ReadableStreamBYOBReader);
await fakePort.writable();
const data = new Uint8Array(1024);
for (let i = 0; i < data.byteLength; ++i)
data[i] = i & 0xff;
fakePort.write(data);
let buffer = new ArrayBuffer(1024);
buffer = await readInto(reader, buffer);
compareArrays(data, new Uint8Array(buffer));
reader.releaseLock();
await port.close();
}, 'Can read a large amount of data over multiple iterations');
|
