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to_memory.cpp
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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 = 1;
// This test is run in two modes: if FILE_DOES_NOT_EXIST defined,
// then testing an XHR of a missing file.
// #define FILE_DOES_NOT_EXIST
int main()
{
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
strcpy(attr.requestMethod, "GET");
attr.userData = (void*)0x12345678;
attr.attributes = EMSCRIPTEN_FETCH_REPLACE | EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
attr.onsuccess = [](emscripten_fetch_t *fetch) {
#if FILE_DOES_NOT_EXIST
assert(false && "onsuccess handler called, but the file shouldn't exist"); // Shouldn't reach here if the file doesn't exist
#endif
assert(fetch);
printf("Finished downloading %llu bytes\n", fetch->numBytes);
assert(fetch->url);
assert(!strcmp(fetch->url, "gears.png"));
assert(fetch->id != 0);
assert((uintptr_t)fetch->userData == 0x12345678);
assert(fetch->totalBytes == 6407);
assert(fetch->numBytes == fetch->totalBytes);
assert(fetch->data != 0);
// 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);
#ifndef FILE_DOES_NOT_EXIST
result = 0;
#endif
exit(result);
};
attr.onprogress = [](emscripten_fetch_t *fetch) {
assert(fetch);
if (fetch->status != 200) return;
printf("onprogress: dataOffset: %llu, numBytes: %llu, totalBytes: %llu\n", fetch->dataOffset, fetch->numBytes, fetch->totalBytes);
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);
}
#ifdef FILE_DOES_NOT_EXIST
// We should not receive progress reports if the file doesn't exist.
assert(false && "onprogress handler called, but the file should not exist");
#endif
// We must receive a call to the onprogress handler with 100% completion.
if (fetch->dataOffset + fetch->numBytes == fetch->totalBytes) ++result;
assert(fetch->dataOffset + fetch->numBytes <= fetch->totalBytes);
assert(fetch->url);
assert(!strcmp(fetch->url, "gears.png"));
assert(fetch->id != 0);
assert((uintptr_t)fetch->userData == 0x12345678);
};
attr.onerror = [](emscripten_fetch_t *fetch) {
printf("Download failed!\n");
#ifndef FILE_DOES_NOT_EXIST
// The file exists, shouldn't reach here.
assert(false && "onerror handler called, but the transfer should have succeeded!");
#endif
assert(fetch);
assert(fetch->id != 0);
assert(!strcmp(fetch->url, "gears.png"));
assert((uintptr_t)fetch->userData == 0x12345678);
#ifdef FILE_DOES_NOT_EXIST
result = 0;
#endif
exit(result);
};
emscripten_fetch_t *fetch = emscripten_fetch(&attr, "gears.png");
assert(fetch != 0);
// emscripten_fetch() must be able to operate without referencing to this
// structure after the call.
memset(&attr, 0, sizeof(attr));
return 99;
}