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// Copyright 2023 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.
//
// This file contains implementations of emscripten APIs that are compatible
// with WasmFS. These replace APIs in src/library*js, and basically do things
// in a simpler manner for the situation where the FS is in wasm and not JS
// (in particular, these implemenations avoid calling from JS to wasm, and
// dependency issues that arise from that).
//
#include <emscripten.h>
#include <stdio.h>
#include <string>
#include "file.h"
#include "file_table.h"
#include "wasmfs.h"
namespace wasmfs {
// Given an fd, returns the string path that the fd refers to.
// TODO: full error handling
// TODO: maybe make this a public API, as it is useful for debugging
std::string getPath(int fd) {
auto fileTable = wasmfs::wasmFS.getFileTable().locked();
auto openFile = fileTable.getEntry(fd);
if (!openFile) {
return "!";
}
auto curr = openFile->locked().getFile();
std::string result = "";
while (curr != wasmfs::wasmFS.getRootDirectory()) {
auto parent = curr->locked().getParent();
// Check if the parent exists. The parent may not exist if curr was
// unlinked.
if (!parent) {
return "?/" + result;
}
auto parentDir = parent->dynCast<wasmfs::Directory>();
auto name = parentDir->locked().getName(curr);
result = '/' + name + result;
curr = parentDir;
}
return result;
}
} // namespace wasmfs
extern "C" {
char* emscripten_get_preloaded_image_data_from_FILE(FILE* file,
int* w,
int* h) {
auto fd = fileno(file);
if (fd < 0) {
return 0;
}
auto path = wasmfs::getPath(fd);
return emscripten_get_preloaded_image_data(path.c_str(), w, h);
}
} // extern "C"
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