@tybys/wasm-util
Version:
WASI polyfill for browser and some wasm util
136 lines (135 loc) • 4.74 kB
JavaScript
import { WasiError } from "./error.mjs";
import { WasiErrno, WasiRights, WasiFileType } from "./types.mjs";
export const RIGHTS_ALL = WasiRights.FD_DATASYNC |
WasiRights.FD_READ |
WasiRights.FD_SEEK |
WasiRights.FD_FDSTAT_SET_FLAGS |
WasiRights.FD_SYNC |
WasiRights.FD_TELL |
WasiRights.FD_WRITE |
WasiRights.FD_ADVISE |
WasiRights.FD_ALLOCATE |
WasiRights.PATH_CREATE_DIRECTORY |
WasiRights.PATH_CREATE_FILE |
WasiRights.PATH_LINK_SOURCE |
WasiRights.PATH_LINK_TARGET |
WasiRights.PATH_OPEN |
WasiRights.FD_READDIR |
WasiRights.PATH_READLINK |
WasiRights.PATH_RENAME_SOURCE |
WasiRights.PATH_RENAME_TARGET |
WasiRights.PATH_FILESTAT_GET |
WasiRights.PATH_FILESTAT_SET_SIZE |
WasiRights.PATH_FILESTAT_SET_TIMES |
WasiRights.FD_FILESTAT_GET |
WasiRights.FD_FILESTAT_SET_TIMES |
WasiRights.FD_FILESTAT_SET_SIZE |
WasiRights.PATH_SYMLINK |
WasiRights.PATH_UNLINK_FILE |
WasiRights.PATH_REMOVE_DIRECTORY |
WasiRights.POLL_FD_READWRITE |
WasiRights.SOCK_SHUTDOWN |
WasiRights.SOCK_ACCEPT;
export const BLOCK_DEVICE_BASE = RIGHTS_ALL;
export const BLOCK_DEVICE_INHERITING = RIGHTS_ALL;
export const CHARACTER_DEVICE_BASE = RIGHTS_ALL;
export const CHARACTER_DEVICE_INHERITING = RIGHTS_ALL;
export const REGULAR_FILE_BASE = WasiRights.FD_DATASYNC |
WasiRights.FD_READ |
WasiRights.FD_SEEK |
WasiRights.FD_FDSTAT_SET_FLAGS |
WasiRights.FD_SYNC |
WasiRights.FD_TELL |
WasiRights.FD_WRITE |
WasiRights.FD_ADVISE |
WasiRights.FD_ALLOCATE |
WasiRights.FD_FILESTAT_GET |
WasiRights.FD_FILESTAT_SET_SIZE |
WasiRights.FD_FILESTAT_SET_TIMES |
WasiRights.POLL_FD_READWRITE;
export const REGULAR_FILE_INHERITING = /*#__PURE__*/ BigInt(0);
export const DIRECTORY_BASE = WasiRights.FD_FDSTAT_SET_FLAGS |
WasiRights.FD_SYNC |
WasiRights.FD_ADVISE |
WasiRights.PATH_CREATE_DIRECTORY |
WasiRights.PATH_CREATE_FILE |
WasiRights.PATH_LINK_SOURCE |
WasiRights.PATH_LINK_TARGET |
WasiRights.PATH_OPEN |
WasiRights.FD_READDIR |
WasiRights.PATH_READLINK |
WasiRights.PATH_RENAME_SOURCE |
WasiRights.PATH_RENAME_TARGET |
WasiRights.PATH_FILESTAT_GET |
WasiRights.PATH_FILESTAT_SET_SIZE |
WasiRights.PATH_FILESTAT_SET_TIMES |
WasiRights.FD_FILESTAT_GET |
WasiRights.FD_FILESTAT_SET_TIMES |
WasiRights.PATH_SYMLINK |
WasiRights.PATH_UNLINK_FILE |
WasiRights.PATH_REMOVE_DIRECTORY |
WasiRights.POLL_FD_READWRITE;
export const DIRECTORY_INHERITING = DIRECTORY_BASE | REGULAR_FILE_BASE;
export const SOCKET_BASE = (WasiRights.FD_READ |
WasiRights.FD_FDSTAT_SET_FLAGS |
WasiRights.FD_WRITE |
WasiRights.FD_FILESTAT_GET |
WasiRights.POLL_FD_READWRITE |
WasiRights.SOCK_SHUTDOWN);
export const SOCKET_INHERITING = RIGHTS_ALL;
export const TTY_BASE = WasiRights.FD_READ |
WasiRights.FD_FDSTAT_SET_FLAGS |
WasiRights.FD_WRITE |
WasiRights.FD_FILESTAT_GET |
WasiRights.POLL_FD_READWRITE;
export const TTY_INHERITING = /*#__PURE__*/ BigInt(0);
export function getRights(stdio, fd, flags, type) {
const ret = {
base: BigInt(0),
inheriting: BigInt(0)
};
if (type === WasiFileType.UNKNOWN) {
throw new WasiError('Unknown file type', WasiErrno.EINVAL);
}
switch (type) {
case WasiFileType.REGULAR_FILE:
ret.base = REGULAR_FILE_BASE;
ret.inheriting = REGULAR_FILE_INHERITING;
break;
case WasiFileType.DIRECTORY:
ret.base = DIRECTORY_BASE;
ret.inheriting = DIRECTORY_INHERITING;
break;
case WasiFileType.SOCKET_STREAM:
case WasiFileType.SOCKET_DGRAM:
ret.base = SOCKET_BASE;
ret.inheriting = SOCKET_INHERITING;
break;
case WasiFileType.CHARACTER_DEVICE:
if (stdio.indexOf(fd) !== -1) {
ret.base = TTY_BASE;
ret.inheriting = TTY_INHERITING;
}
else {
ret.base = CHARACTER_DEVICE_BASE;
ret.inheriting = CHARACTER_DEVICE_INHERITING;
}
break;
case WasiFileType.BLOCK_DEVICE:
ret.base = BLOCK_DEVICE_BASE;
ret.inheriting = BLOCK_DEVICE_INHERITING;
break;
default:
ret.base = BigInt(0);
ret.inheriting = BigInt(0);
}
/* Disable read/write bits depending on access mode. */
const read_or_write_only = flags & (0 | 1 | 2);
if (read_or_write_only === 0) {
ret.base &= ~WasiRights.FD_WRITE;
}
else if (read_or_write_only === 1) {
ret.base &= ~WasiRights.FD_READ;
}
return ret;
}