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cached_xhr.cpp
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69 lines (62 loc) · 2.48 KB
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// 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/fetch.h>
int result = 0;
// Fetch file without XHRing.
void fetchFromIndexedDB()
{
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
strcpy(attr.requestMethod, "GET");
attr.onsuccess = [](emscripten_fetch_t *fetch) {
assert(fetch->numBytes == fetch->totalBytes);
assert(fetch->data != 0);
printf("Finished downloading %llu bytes\n", fetch->numBytes);
emscripten_fetch_close(fetch);
#ifdef REPORT_RESULT
// Fetch API appears to sometimes call the handlers more than once, see https://github.com/emscripten-core/emscripten/pull/8191
MAYBE_REPORT_RESULT(1);
#endif
};
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.attributes = EMSCRIPTEN_FETCH_APPEND | EMSCRIPTEN_FETCH_NO_DOWNLOAD;
emscripten_fetch_t *fetch = emscripten_fetch(&attr, "gears.png");
}
// XHR and store to cache.
int main()
{
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
strcpy(attr.requestMethod, "GET");
attr.onsuccess = [](emscripten_fetch_t *fetch) {
assert(fetch->numBytes == fetch->totalBytes);
assert(fetch->data != 0);
printf("Finished downloading %llu bytes\n", fetch->numBytes);
emscripten_fetch_close(fetch);
// Test that the file now exists:
fetchFromIndexedDB();
};
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.attributes = EMSCRIPTEN_FETCH_REPLACE | EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_PERSIST_FILE;
emscripten_fetch_t *fetch = emscripten_fetch(&attr, "gears.png");
assert(fetch != 0);
memset(&attr, 0, sizeof(attr)); // emscripten_fetch() must be able to operate without referencing to this structure after the call.
}