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
66
67
68
69
70
|
importScripts("/resources/testharness.js");
importScripts('resources/sync-access-handle-test.js');
'use strict';
sync_access_handle_test((t, handle) => {
// Without this assertion, the test passes even if truncate is not defined.
assert_implements(handle.truncate,
"SyncAccessHandle.truncate is not implemented.");
handle.truncate(4);
assert_equals(handle.getSize(), 4);
handle.truncate(2);
assert_equals(handle.getSize(), 2);
handle.truncate(7);
assert_equals(handle.getSize(), 7);
handle.truncate(0);
assert_equals(handle.getSize(), 0);
assert_throws_js(TypeError, () => handle.truncate(-4));
}, 'test SyncAccessHandle.truncate with different sizes');
sync_access_handle_test((t, handle) => {
const writeBuffer = new Uint8Array(4);
writeBuffer.set([96, 97, 98, 99]);
handle.write(writeBuffer, {at: 0});
handle.truncate(2);
let readBuffer = new Uint8Array(6);
assert_equals(2, handle.read(readBuffer, {at: 0}));
let expected = new Uint8Array(6);
expected.set([96, 97, 0, 0, 0, 0]);
assert_array_equals(expected, readBuffer);
// Resize the file to 6, expect that everything beyond the old size is '0'.
handle.truncate(6);
assert_equals(6, handle.read(readBuffer, {at: 0}));
assert_array_equals(expected, readBuffer);
}, 'test SyncAccessHandle.truncate after SyncAccessHandle.write');
sync_access_handle_test((t, handle) => {
const writeBuffer = new Uint8Array(4);
writeBuffer.set([96, 97, 98, 99]);
handle.write(writeBuffer, {at: 0});
// Moves cursor to 2
handle.truncate(2);
let readBuffer = new Uint8Array(256);
assert_equals(handle.read(readBuffer), 0);
writeBuffer.set([100, 101, 102, 103]);
handle.write(writeBuffer);
assert_equals(handle.read(readBuffer, {at: 0}), 6);
let expected = new Uint8Array(256);
expected.set([96, 97, 100, 101, 102, 103]);
assert_array_equals(readBuffer, expected);
// Resize the file to 10, expect that everything beyond the old size is '0'.
handle.truncate(10); // file cursor should still be at 6
// overwrite two bytes
const writeBuffer2 = new Uint8Array(2);
writeBuffer2.set([110, 111]);
handle.write(writeBuffer2);
expected = new Uint8Array(256);
expected.set([96, 97, 100, 101, 102, 103, 110, 111, 0, 0]);
assert_equals(handle.read(readBuffer, {at: 0}), 10);
assert_array_equals(readBuffer, expected);
}, 'Test truncate effect on cursor');
done();
|
