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/*
* Copyright 2021 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 <assert.h>
#include <dirent.h>
#include <emscripten/emscripten.h>
#include <emscripten/wasmfs.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
// NOTE: Each fetch backend runs in a separate thread. When not using
// PROXY_TO_PTHREAD, that means we need a pool of at least one thread per
// backend, so updating test_browser.py may be needed when adding more
// here.
void getUrlOrigin(char* ptr, int len);
char url_orig[256] = {};
void check_file(int fd, const char* content) {
assert(fd >= 0);
struct stat st;
assert(fstat(fd, &st) != -1);
printf("file size: %lld\n", st.st_size);
assert(st.st_size > 0);
char buf[st.st_size];
int bytes_read = read(fd, buf, st.st_size);
printf("read size: %d\n", bytes_read);
buf[bytes_read] = 0;
printf("'%s'\n", buf);
assert(strcmp(buf, content) == 0);
}
void test_url_relative() {
printf("Running %s...\n", __FUNCTION__);
backend_t backend2 = wasmfs_create_fetch_backend("test.txt");
int fd = wasmfs_create_file("/file_rel", 0777, backend2);
check_file(fd, "fetch 2");
assert(close(fd) == 0);
}
void test_url_absolute() {
printf("Running %s...\n", __FUNCTION__);
assert(strlen(url_orig) != 0);
const char* file_name = "/test.txt";
char url[200];
snprintf(url, sizeof(url), "%s%s", url_orig, file_name);
backend_t backend = wasmfs_create_fetch_backend(url);
int fd = wasmfs_create_file(file_name, 0777, backend);
check_file(fd, "fetch 2");
assert(close(fd) == 0);
}
void test_directory_abs() {
printf("Running %s...\n", __FUNCTION__);
const char* dir_path = "/subdir";
char url[200];
snprintf(url, sizeof(url), "%s%s", url_orig, dir_path);
backend_t backend = wasmfs_create_fetch_backend(url);
int res = wasmfs_create_directory(dir_path, 0777, backend);
if (errno)
perror("wasmfs_create_directory");
assert(errno == 0);
assert(res == 0);
int fd = wasmfs_create_file("/subdir/backendfile", 0777, backend);
int fd2 = wasmfs_create_file("/subdir/backendfile2", 0777, backend);
printf("readdir: %s\n", dir_path);
struct dirent* entry;
DIR* dir = opendir(dir_path);
assert(dir);
int n = 0;
while ((entry = readdir(dir)) != NULL) {
printf(" %s\n", entry->d_name);
++n;
}
assert(n == 4);
closedir(dir);
check_file(fd, "file 1");
check_file(fd2, "file 2");
assert(close(fd) == 0);
assert(close(fd2) == 0);
}
void test_default() {
printf("Running %s...\n", __FUNCTION__);
backend_t backend = wasmfs_create_fetch_backend("data.dat");
// Create a file in that backend.
int fd = wasmfs_create_file("/testfile", 0777, backend);
// Get the size of the file. This will cause a transparent fetch of the data,
// after which the size is > 0
struct stat file;
assert(fstat(fd, &file) != -1);
printf("file size: %lld\n", file.st_size);
assert(file.st_size > 0);
// Create a second file.
int fd2 = wasmfs_create_file("/testfile2", 0777, backend);
// Read the data from the file. As before, when we need the data it is
// transparently fetched for us.
char buf[file.st_size];
int bytes_read = read(fd, buf, file.st_size);
printf("read size: %d\n", bytes_read);
assert(errno == 0);
buf[bytes_read] = 0;
printf("%s\n", buf);
assert(strcmp(buf, "hello, fetch") == 0);
assert(close(fd) == 0);
assert(close(fd2) == 0);
}
void test_small_reads() {
// Read the file in small amounts.
printf("Running %s...\n", __FUNCTION__);
char expected[] = "hello";
size_t size = 5;
backend_t backend = wasmfs_create_fetch_backend("small.dat");
int fd = wasmfs_create_file("/testfile3", 0777, backend);
char buf[size + 1];
for (size_t i = 0; i < size; i++) {
int read_now = read(fd, buf + i, 1);
assert(read_now == 1);
printf("read one byte\n");
}
buf[size] = 0;
assert(strcmp(buf, "hello") == 0);
assert(close(fd) == 0);
}
void test_nonexistent() {
printf("Running %s...\n", __FUNCTION__);
const char* dir_path = "/subdir";
char url[200];
snprintf(url, sizeof(url), "%s%s", url_orig, dir_path);
backend_t backend = wasmfs_get_backend_by_path(url);
const char* file_name = "/subdir/nonexistent.txt";
int fd = wasmfs_create_file(file_name, 0777, backend);
struct stat file;
assert(fstat(fd, &file) != -1);
printf("file size: %lld\n", file.st_size);
assert(file.st_size == 0);
errno = 0;
char buf[1];
int bytes_read = read(fd, buf, sizeof(buf));
printf("Bytes read: %d\n", bytes_read);
assert(bytes_read == -1);
printf("Errno: %s\n", strerror(errno));
assert(errno == ENOENT);
assert(close(fd) == 0);
}
int main() {
getUrlOrigin(url_orig, sizeof(url_orig));
test_default();
test_url_relative();
test_url_absolute();
test_directory_abs();
test_small_reads();
test_nonexistent();
return 0;
}
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