forked from emscripten-core/emscripten
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathsync_xhr.cpp
More file actions
60 lines (52 loc) · 1.92 KB
/
sync_xhr.cpp
File metadata and controls
60 lines (52 loc) · 1.92 KB
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
// Copyright 2016 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#include <emscripten.h>
#include <emscripten/fetch.h>
int result = -1;
int main()
{
// If an exception is thrown from the user callback, it bubbles up to self.onerror but is otherwise completely
// swallowed by xhr.send.
EM_ASM({self.onerror = function() {
out('Got error');
HEAP32[$0 >> 2] = 2;
};}, &result);
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
strcpy(attr.requestMethod, "GET");
attr.attributes = EMSCRIPTEN_FETCH_REPLACE | EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_SYNCHRONOUS;
attr.onsuccess = [](emscripten_fetch_t *fetch) {
printf("Finished downloading %llu bytes\n", fetch->numBytes);
// Compute rudimentary checksum of data
uint8_t checksum = 0;
for(int i = 0; i < fetch->numBytes; ++i)
checksum ^= fetch->data[i];
printf("Data checksum: %02X\n", checksum);
assert(checksum == 0x08);
emscripten_fetch_close(fetch);
if (result == -1) result = 0;
};
attr.onprogress = [](emscripten_fetch_t *fetch) {
if (fetch->totalBytes > 0) {
printf("Downloading.. %.2f%% complete.\n", (fetch->dataOffset + fetch->numBytes) * 100.0 / fetch->totalBytes);
} else {
printf("Downloading.. %lld bytes complete.\n", fetch->dataOffset + fetch->numBytes);
}
};
attr.onerror = [](emscripten_fetch_t *fetch) {
printf("Download failed!\n");
assert(false && "Shouldn't fail!");
};
emscripten_fetch_t *fetch = emscripten_fetch(&attr, "gears.png");
if (result == -1) {
printf("emscripten_fetch() failed to run synchronously!\n");
}
assert(result == 0);
return result;
}