Revision 47c46fed9b6f4e28d2ec9c9b2c0fc19f4f8c8ff9 authored by Jukka Jylänki on 28 July 2014, 20:16:53 UTC, committed by Jukka Jylänki on 29 July 2014, 07:01:38 UTC
1 parent 97ad2b9
library_fs.js
mergeInto(LibraryManager.library, {
$FS__deps: ['$ERRNO_CODES', '$ERRNO_MESSAGES', '__setErrNo', '$PATH', '$TTY', '$MEMFS', '$IDBFS', '$NODEFS', 'stdin', 'stdout', 'stderr', 'fflush'],
$FS__postset: 'FS.staticInit();' +
'__ATINIT__.unshift({ func: function() { if (!Module["noFSInit"] && !FS.init.initialized) FS.init() } });' +
'__ATMAIN__.push({ func: function() { FS.ignorePermissions = false } });' +
'__ATEXIT__.push({ func: function() { FS.quit() } });' +
// export some names through closure
'Module["FS_createFolder"] = FS.createFolder;' +
'Module["FS_createPath"] = FS.createPath;' +
'Module["FS_createDataFile"] = FS.createDataFile;' +
'Module["FS_createPreloadedFile"] = FS.createPreloadedFile;' +
'Module["FS_createLazyFile"] = FS.createLazyFile;' +
'Module["FS_createLink"] = FS.createLink;' +
'Module["FS_createDevice"] = FS.createDevice;',
$FS: {
root: null,
mounts: [],
devices: [null],
streams: [],
nextInode: 1,
nameTable: null,
currentPath: '/',
initialized: false,
// Whether we are currently ignoring permissions. Useful when preparing the
// filesystem and creating files inside read-only folders.
// This is set to false when the runtime is initialized, allowing you
// to modify the filesystem freely before run() is called.
ignorePermissions: true,
trackingDelegate: {},
tracking: {
openFlags: {
READ: 1 << 0,
WRITE: 1 << 1
}
},
ErrnoError: null, // set during init
genericErrors: {},
handleFSError: function(e) {
if (!(e instanceof FS.ErrnoError)) throw e + ' : ' + stackTrace();
return ___setErrNo(e.errno);
},
//
// paths
//
lookupPath: function(path, opts) {
path = PATH.resolve(FS.cwd(), path);
opts = opts || {};
if (!path) return { path: '', node: null };
var defaults = {
follow_mount: true,
recurse_count: 0
};
for (var key in defaults) {
if (opts[key] === undefined) {
opts[key] = defaults[key];
}
}
if (opts.recurse_count > 8) { // max recursive lookup of 8
throw new FS.ErrnoError(ERRNO_CODES.ELOOP);
}
// split the path
var parts = PATH.normalizeArray(path.split('/').filter(function(p) {
return !!p;
}), false);
// start at the root
var current = FS.root;
var current_path = '/';
for (var i = 0; i < parts.length; i++) {
var islast = (i === parts.length-1);
if (islast && opts.parent) {
// stop resolving
break;
}
current = FS.lookupNode(current, parts[i]);
current_path = PATH.join2(current_path, parts[i]);
// jump to the mount's root node if this is a mountpoint
if (FS.isMountpoint(current)) {
if (!islast || (islast && opts.follow_mount)) {
current = current.mounted.root;
}
}
// by default, lookupPath will not follow a symlink if it is the final path component.
// setting opts.follow = true will override this behavior.
if (!islast || opts.follow) {
var count = 0;
while (FS.isLink(current.mode)) {
var link = FS.readlink(current_path);
current_path = PATH.resolve(PATH.dirname(current_path), link);
var lookup = FS.lookupPath(current_path, { recurse_count: opts.recurse_count });
current = lookup.node;
if (count++ > 40) { // limit max consecutive symlinks to 40 (SYMLOOP_MAX).
throw new FS.ErrnoError(ERRNO_CODES.ELOOP);
}
}
}
}
return { path: current_path, node: current };
},
getPath: function(node) {
var path;
while (true) {
if (FS.isRoot(node)) {
var mount = node.mount.mountpoint;
if (!path) return mount;
return mount[mount.length-1] !== '/' ? mount + '/' + path : mount + path;
}
path = path ? node.name + '/' + path : node.name;
node = node.parent;
}
},
//
// nodes
//
hashName: function(parentid, name) {
var hash = 0;
#if CASE_INSENSITIVE_FS
name = name.toLowerCase();
#endif
for (var i = 0; i < name.length; i++) {
hash = ((hash << 5) - hash + name.charCodeAt(i)) | 0;
}
return ((parentid + hash) >>> 0) % FS.nameTable.length;
},
hashAddNode: function(node) {
var hash = FS.hashName(node.parent.id, node.name);
node.name_next = FS.nameTable[hash];
FS.nameTable[hash] = node;
},
hashRemoveNode: function(node) {
var hash = FS.hashName(node.parent.id, node.name);
if (FS.nameTable[hash] === node) {
FS.nameTable[hash] = node.name_next;
} else {
var current = FS.nameTable[hash];
while (current) {
if (current.name_next === node) {
current.name_next = node.name_next;
break;
}
current = current.name_next;
}
}
},
lookupNode: function(parent, name) {
var err = FS.mayLookup(parent);
if (err) {
throw new FS.ErrnoError(err);
}
var hash = FS.hashName(parent.id, name);
#if CASE_INSENSITIVE_FS
name = name.toLowerCase();
#endif
for (var node = FS.nameTable[hash]; node; node = node.name_next) {
var nodeName = node.name;
#if CASE_INSENSITIVE_FS
nodeName = nodeName.toLowerCase();
#endif
if (node.parent.id === parent.id && nodeName === name) {
return node;
}
}
// if we failed to find it in the cache, call into the VFS
return FS.lookup(parent, name);
},
createNode: function(parent, name, mode, rdev) {
if (!FS.FSNode) {
FS.FSNode = function(parent, name, mode, rdev) {
if (!parent) {
parent = this; // root node sets parent to itself
}
this.parent = parent;
this.mount = parent.mount;
this.mounted = null;
this.id = FS.nextInode++;
this.name = name;
this.mode = mode;
this.node_ops = {};
this.stream_ops = {};
this.rdev = rdev;
};
FS.FSNode.prototype = {};
// compatibility
var readMode = {{{ cDefine('S_IRUGO') }}} | {{{ cDefine('S_IXUGO') }}};
var writeMode = {{{ cDefine('S_IWUGO') }}};
// NOTE we must use Object.defineProperties instead of individual calls to
// Object.defineProperty in order to make closure compiler happy
Object.defineProperties(FS.FSNode.prototype, {
read: {
get: function() { return (this.mode & readMode) === readMode; },
set: function(val) { val ? this.mode |= readMode : this.mode &= ~readMode; }
},
write: {
get: function() { return (this.mode & writeMode) === writeMode; },
set: function(val) { val ? this.mode |= writeMode : this.mode &= ~writeMode; }
},
isFolder: {
get: function() { return FS.isDir(this.mode); },
},
isDevice: {
get: function() { return FS.isChrdev(this.mode); },
},
});
}
var node = new FS.FSNode(parent, name, mode, rdev);
FS.hashAddNode(node);
return node;
},
destroyNode: function(node) {
FS.hashRemoveNode(node);
},
isRoot: function(node) {
return node === node.parent;
},
isMountpoint: function(node) {
return !!node.mounted;
},
isFile: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFREG') }}};
},
isDir: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFDIR') }}};
},
isLink: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFLNK') }}};
},
isChrdev: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFCHR') }}};
},
isBlkdev: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFBLK') }}};
},
isFIFO: function(mode) {
return (mode & {{{ cDefine('S_IFMT') }}}) === {{{ cDefine('S_IFIFO') }}};
},
isSocket: function(mode) {
return (mode & {{{ cDefine('S_IFSOCK') }}}) === {{{ cDefine('S_IFSOCK') }}};
},
//
// permissions
//
flagModes: {
'"r"': {{{ cDefine('O_RDONLY') }}},
'"rs"': {{{ cDefine('O_RDONLY') }}} | {{{ cDefine('O_SYNC') }}},
'"r+"': {{{ cDefine('O_RDWR') }}},
'"w"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}},
'"wx"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"xw"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"w+"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}},
'"wx+"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}},
'"xw+"': {{{ cDefine('O_TRUNC') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}},
'"a"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}},
'"ax"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"xa"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_EXCL') }}},
'"a+"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}},
'"ax+"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}},
'"xa+"': {{{ cDefine('O_APPEND') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_RDWR') }}} | {{{ cDefine('O_EXCL') }}}
},
// convert the 'r', 'r+', etc. to it's corresponding set of O_* flags
modeStringToFlags: function(str) {
var flags = FS.flagModes[str];
if (typeof flags === 'undefined') {
throw new Error('Unknown file open mode: ' + str);
}
return flags;
},
// convert O_* bitmask to a string for nodePermissions
flagsToPermissionString: function(flag) {
var accmode = flag & {{{ cDefine('O_ACCMODE') }}};
var perms = ['r', 'w', 'rw'][accmode];
if ((flag & {{{ cDefine('O_TRUNC') }}})) {
perms += 'w';
}
return perms;
},
nodePermissions: function(node, perms) {
if (FS.ignorePermissions) {
return 0;
}
// return 0 if any user, group or owner bits are set.
if (perms.indexOf('r') !== -1 && !(node.mode & {{{ cDefine('S_IRUGO') }}})) {
return ERRNO_CODES.EACCES;
} else if (perms.indexOf('w') !== -1 && !(node.mode & {{{ cDefine('S_IWUGO') }}})) {
return ERRNO_CODES.EACCES;
} else if (perms.indexOf('x') !== -1 && !(node.mode & {{{ cDefine('S_IXUGO') }}})) {
return ERRNO_CODES.EACCES;
}
return 0;
},
mayLookup: function(dir) {
var err = FS.nodePermissions(dir, 'x');
if (err) return err;
if (!dir.node_ops.lookup) return ERRNO_CODES.EACCES;
return 0;
},
mayCreate: function(dir, name) {
try {
var node = FS.lookupNode(dir, name);
return ERRNO_CODES.EEXIST;
} catch (e) {
}
return FS.nodePermissions(dir, 'wx');
},
mayDelete: function(dir, name, isdir) {
var node;
try {
node = FS.lookupNode(dir, name);
} catch (e) {
return e.errno;
}
var err = FS.nodePermissions(dir, 'wx');
if (err) {
return err;
}
if (isdir) {
if (!FS.isDir(node.mode)) {
return ERRNO_CODES.ENOTDIR;
}
if (FS.isRoot(node) || FS.getPath(node) === FS.cwd()) {
return ERRNO_CODES.EBUSY;
}
} else {
if (FS.isDir(node.mode)) {
return ERRNO_CODES.EISDIR;
}
}
return 0;
},
mayOpen: function(node, flags) {
if (!node) {
return ERRNO_CODES.ENOENT;
}
if (FS.isLink(node.mode)) {
return ERRNO_CODES.ELOOP;
} else if (FS.isDir(node.mode)) {
if ((flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_RDONLY')}}} || // opening for write
(flags & {{{ cDefine('O_TRUNC') }}})) {
return ERRNO_CODES.EISDIR;
}
}
return FS.nodePermissions(node, FS.flagsToPermissionString(flags));
},
//
// streams
//
MAX_OPEN_FDS: 4096,
nextfd: function(fd_start, fd_end) {
fd_start = fd_start || 0;
fd_end = fd_end || FS.MAX_OPEN_FDS;
for (var fd = fd_start; fd <= fd_end; fd++) {
if (!FS.streams[fd]) {
return fd;
}
}
throw new FS.ErrnoError(ERRNO_CODES.EMFILE);
},
getStream: function(fd) {
return FS.streams[fd];
},
// TODO parameterize this function such that a stream
// object isn't directly passed in. not possible until
// SOCKFS is completed.
createStream: function(stream, fd_start, fd_end) {
if (!FS.FSStream) {
FS.FSStream = function(){};
FS.FSStream.prototype = {};
// compatibility
Object.defineProperties(FS.FSStream.prototype, {
object: {
get: function() { return this.node; },
set: function(val) { this.node = val; }
},
isRead: {
get: function() { return (this.flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_WRONLY') }}}; }
},
isWrite: {
get: function() { return (this.flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_RDONLY') }}}; }
},
isAppend: {
get: function() { return (this.flags & {{{ cDefine('O_APPEND') }}}); }
}
});
}
// clone it, so we can return an instance of FSStream
var newStream = new FS.FSStream();
for (var p in stream) {
newStream[p] = stream[p];
}
stream = newStream;
var fd = FS.nextfd(fd_start, fd_end);
stream.fd = fd;
FS.streams[fd] = stream;
return stream;
},
closeStream: function(fd) {
FS.streams[fd] = null;
},
//
// file pointers
//
// instead of maintaining a separate mapping from FILE* to file descriptors,
// we employ a simple trick: the pointer to a stream is its fd plus 1. This
// means that all valid streams have a valid non-zero pointer while allowing
// the fs for stdin to be the standard value of zero.
//
//
getStreamFromPtr: function(ptr) {
return FS.streams[ptr - 1];
},
getPtrForStream: function(stream) {
return stream ? stream.fd + 1 : 0;
},
//
// devices
//
// each character device consists of a device id + stream operations.
// when a character device node is created (e.g. /dev/stdin) it is
// assigned a device id that lets us map back to the actual device.
// by default, each character device stream (e.g. _stdin) uses chrdev_stream_ops.
// however, once opened, the stream's operations are overridden with
// the operations of the device its underlying node maps back to.
chrdev_stream_ops: {
open: function(stream) {
var device = FS.getDevice(stream.node.rdev);
// override node's stream ops with the device's
stream.stream_ops = device.stream_ops;
// forward the open call
if (stream.stream_ops.open) {
stream.stream_ops.open(stream);
}
},
llseek: function() {
throw new FS.ErrnoError(ERRNO_CODES.ESPIPE);
}
},
major: function(dev) {
return ((dev) >> 8);
},
minor: function(dev) {
return ((dev) & 0xff);
},
makedev: function(ma, mi) {
return ((ma) << 8 | (mi));
},
registerDevice: function(dev, ops) {
FS.devices[dev] = { stream_ops: ops };
},
getDevice: function(dev) {
return FS.devices[dev];
},
//
// core
//
getMounts: function(mount) {
var mounts = [];
var check = [mount];
while (check.length) {
var m = check.pop();
mounts.push(m);
check.push.apply(check, m.mounts);
}
return mounts;
},
syncfs: function(populate, callback) {
if (typeof(populate) === 'function') {
callback = populate;
populate = false;
}
var mounts = FS.getMounts(FS.root.mount);
var completed = 0;
function done(err) {
if (err) {
if (!done.errored) {
done.errored = true;
return callback(err);
}
return;
}
if (++completed >= mounts.length) {
callback(null);
}
};
// sync all mounts
mounts.forEach(function (mount) {
if (!mount.type.syncfs) {
return done(null);
}
mount.type.syncfs(mount, populate, done);
});
},
mount: function(type, opts, mountpoint) {
var root = mountpoint === '/';
var pseudo = !mountpoint;
var node;
if (root && FS.root) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
} else if (!root && !pseudo) {
var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
mountpoint = lookup.path; // use the absolute path
node = lookup.node;
if (FS.isMountpoint(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
if (!FS.isDir(node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.ENOTDIR);
}
}
var mount = {
type: type,
opts: opts,
mountpoint: mountpoint,
mounts: []
};
// create a root node for the fs
var mountRoot = type.mount(mount);
mountRoot.mount = mount;
mount.root = mountRoot;
if (root) {
FS.root = mountRoot;
} else if (node) {
// set as a mountpoint
node.mounted = mount;
// add the new mount to the current mount's children
if (node.mount) {
node.mount.mounts.push(mount);
}
}
return mountRoot;
},
unmount: function (mountpoint) {
var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
if (!FS.isMountpoint(lookup.node)) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
// destroy the nodes for this mount, and all its child mounts
var node = lookup.node;
var mount = node.mounted;
var mounts = FS.getMounts(mount);
Object.keys(FS.nameTable).forEach(function (hash) {
var current = FS.nameTable[hash];
while (current) {
var next = current.name_next;
if (mounts.indexOf(current.mount) !== -1) {
FS.destroyNode(current);
}
current = next;
}
});
// no longer a mountpoint
node.mounted = null;
// remove this mount from the child mounts
var idx = node.mount.mounts.indexOf(mount);
assert(idx !== -1);
node.mount.mounts.splice(idx, 1);
},
lookup: function(parent, name) {
return parent.node_ops.lookup(parent, name);
},
// generic function for all node creation
mknod: function(path, mode, dev) {
var lookup = FS.lookupPath(path, { parent: true });
var parent = lookup.node;
var name = PATH.basename(path);
if (!name || name === '.' || name === '..') {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
var err = FS.mayCreate(parent, name);
if (err) {
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.mknod) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
return parent.node_ops.mknod(parent, name, mode, dev);
},
// helpers to create specific types of nodes
create: function(path, mode) {
mode = mode !== undefined ? mode : 438 /* 0666 */;
mode &= {{{ cDefine('S_IALLUGO') }}};
mode |= {{{ cDefine('S_IFREG') }}};
return FS.mknod(path, mode, 0);
},
mkdir: function(path, mode) {
mode = mode !== undefined ? mode : 511 /* 0777 */;
mode &= {{{ cDefine('S_IRWXUGO') }}} | {{{ cDefine('S_ISVTX') }}};
mode |= {{{ cDefine('S_IFDIR') }}};
return FS.mknod(path, mode, 0);
},
mkdev: function(path, mode, dev) {
if (typeof(dev) === 'undefined') {
dev = mode;
mode = 438 /* 0666 */;
}
mode |= {{{ cDefine('S_IFCHR') }}};
return FS.mknod(path, mode, dev);
},
symlink: function(oldpath, newpath) {
if (!PATH.resolve(oldpath)) {
throw new FS.ErrnoError(ERRNO_CODES.ENOENT);
}
var lookup = FS.lookupPath(newpath, { parent: true });
var parent = lookup.node;
if (!parent) {
throw new FS.ErrnoError(ERRNO_CODES.ENOENT);
}
var newname = PATH.basename(newpath);
var err = FS.mayCreate(parent, newname);
if (err) {
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.symlink) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
return parent.node_ops.symlink(parent, newname, oldpath);
},
rename: function(old_path, new_path) {
var old_dirname = PATH.dirname(old_path);
var new_dirname = PATH.dirname(new_path);
var old_name = PATH.basename(old_path);
var new_name = PATH.basename(new_path);
// parents must exist
var lookup, old_dir, new_dir;
try {
lookup = FS.lookupPath(old_path, { parent: true });
old_dir = lookup.node;
lookup = FS.lookupPath(new_path, { parent: true });
new_dir = lookup.node;
} catch (e) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
if (!old_dir || !new_dir) throw new FS.ErrnoError(ERRNO_CODES.ENOENT);
// need to be part of the same mount
if (old_dir.mount !== new_dir.mount) {
throw new FS.ErrnoError(ERRNO_CODES.EXDEV);
}
// source must exist
var old_node = FS.lookupNode(old_dir, old_name);
// old path should not be an ancestor of the new path
var relative = PATH.relative(old_path, new_dirname);
if (relative.charAt(0) !== '.') {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
// new path should not be an ancestor of the old path
relative = PATH.relative(new_path, old_dirname);
if (relative.charAt(0) !== '.') {
throw new FS.ErrnoError(ERRNO_CODES.ENOTEMPTY);
}
// see if the new path already exists
var new_node;
try {
new_node = FS.lookupNode(new_dir, new_name);
} catch (e) {
// not fatal
}
// early out if nothing needs to change
if (old_node === new_node) {
return;
}
// we'll need to delete the old entry
var isdir = FS.isDir(old_node.mode);
var err = FS.mayDelete(old_dir, old_name, isdir);
if (err) {
throw new FS.ErrnoError(err);
}
// need delete permissions if we'll be overwriting.
// need create permissions if new doesn't already exist.
err = new_node ?
FS.mayDelete(new_dir, new_name, isdir) :
FS.mayCreate(new_dir, new_name);
if (err) {
throw new FS.ErrnoError(err);
}
if (!old_dir.node_ops.rename) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isMountpoint(old_node) || (new_node && FS.isMountpoint(new_node))) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
// if we are going to change the parent, check write permissions
if (new_dir !== old_dir) {
err = FS.nodePermissions(old_dir, 'w');
if (err) {
throw new FS.ErrnoError(err);
}
}
try {
if (FS.trackingDelegate['willMovePath']) {
FS.trackingDelegate['willMovePath'](old_path, new_path);
}
} catch(e) {
console.log("FS.trackingDelegate['willMovePath']('"+old_path+"', '"+new_path+"') threw an exception: " + e.message);
}
// remove the node from the lookup hash
FS.hashRemoveNode(old_node);
// do the underlying fs rename
try {
old_dir.node_ops.rename(old_node, new_dir, new_name);
} catch (e) {
throw e;
} finally {
// add the node back to the hash (in case node_ops.rename
// changed its name)
FS.hashAddNode(old_node);
}
try {
if (FS.trackingDelegate['onMovePath']) FS.trackingDelegate['onMovePath'](old_path, new_path);
} catch(e) {
console.log("FS.trackingDelegate['onMovePath']('"+old_path+"', '"+new_path+"') threw an exception: " + e.message);
}
},
rmdir: function(path) {
var lookup = FS.lookupPath(path, { parent: true });
var parent = lookup.node;
var name = PATH.basename(path);
var node = FS.lookupNode(parent, name);
var err = FS.mayDelete(parent, name, true);
if (err) {
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.rmdir) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isMountpoint(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
try {
if (FS.trackingDelegate['willDeletePath']) {
FS.trackingDelegate['willDeletePath'](path);
}
} catch(e) {
console.log("FS.trackingDelegate['willDeletePath']('"+path+"') threw an exception: " + e.message);
}
parent.node_ops.rmdir(parent, name);
FS.destroyNode(node);
try {
if (FS.trackingDelegate['onDeletePath']) FS.trackingDelegate['onDeletePath'](path);
} catch(e) {
console.log("FS.trackingDelegate['onDeletePath']('"+path+"') threw an exception: " + e.message);
}
},
readdir: function(path) {
var lookup = FS.lookupPath(path, { follow: true });
var node = lookup.node;
if (!node.node_ops.readdir) {
throw new FS.ErrnoError(ERRNO_CODES.ENOTDIR);
}
return node.node_ops.readdir(node);
},
unlink: function(path) {
var lookup = FS.lookupPath(path, { parent: true });
var parent = lookup.node;
var name = PATH.basename(path);
var node = FS.lookupNode(parent, name);
var err = FS.mayDelete(parent, name, false);
if (err) {
// POSIX says unlink should set EPERM, not EISDIR
if (err === ERRNO_CODES.EISDIR) err = ERRNO_CODES.EPERM;
throw new FS.ErrnoError(err);
}
if (!parent.node_ops.unlink) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isMountpoint(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EBUSY);
}
try {
if (FS.trackingDelegate['willDeletePath']) {
FS.trackingDelegate['willDeletePath'](path);
}
} catch(e) {
console.log("FS.trackingDelegate['willDeletePath']('"+path+"') threw an exception: " + e.message);
}
parent.node_ops.unlink(parent, name);
FS.destroyNode(node);
try {
if (FS.trackingDelegate['onDeletePath']) FS.trackingDelegate['onDeletePath'](path);
} catch(e) {
console.log("FS.trackingDelegate['onDeletePath']('"+path+"') threw an exception: " + e.message);
}
},
readlink: function(path) {
var lookup = FS.lookupPath(path);
var link = lookup.node;
if (!link.node_ops.readlink) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
return link.node_ops.readlink(link);
},
stat: function(path, dontFollow) {
var lookup = FS.lookupPath(path, { follow: !dontFollow });
var node = lookup.node;
if (!node) {
throw new FS.ErrnoError(ERRNO_CODES.ENOENT);
}
if (!node.node_ops.getattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
return node.node_ops.getattr(node);
},
lstat: function(path) {
return FS.stat(path, true);
},
chmod: function(path, mode, dontFollow) {
var node;
if (typeof path === 'string') {
var lookup = FS.lookupPath(path, { follow: !dontFollow });
node = lookup.node;
} else {
node = path;
}
if (!node.node_ops.setattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
node.node_ops.setattr(node, {
mode: (mode & {{{ cDefine('S_IALLUGO') }}}) | (node.mode & ~{{{ cDefine('S_IALLUGO') }}}),
timestamp: Date.now()
});
},
lchmod: function(path, mode) {
FS.chmod(path, mode, true);
},
fchmod: function(fd, mode) {
var stream = FS.getStream(fd);
if (!stream) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
FS.chmod(stream.node, mode);
},
chown: function(path, uid, gid, dontFollow) {
var node;
if (typeof path === 'string') {
var lookup = FS.lookupPath(path, { follow: !dontFollow });
node = lookup.node;
} else {
node = path;
}
if (!node.node_ops.setattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
node.node_ops.setattr(node, {
timestamp: Date.now()
// we ignore the uid / gid for now
});
},
lchown: function(path, uid, gid) {
FS.chown(path, uid, gid, true);
},
fchown: function(fd, uid, gid) {
var stream = FS.getStream(fd);
if (!stream) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
FS.chown(stream.node, uid, gid);
},
truncate: function(path, len) {
if (len < 0) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
var node;
if (typeof path === 'string') {
var lookup = FS.lookupPath(path, { follow: true });
node = lookup.node;
} else {
node = path;
}
if (!node.node_ops.setattr) {
throw new FS.ErrnoError(ERRNO_CODES.EPERM);
}
if (FS.isDir(node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EISDIR);
}
if (!FS.isFile(node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
var err = FS.nodePermissions(node, 'w');
if (err) {
throw new FS.ErrnoError(err);
}
node.node_ops.setattr(node, {
size: len,
timestamp: Date.now()
});
},
ftruncate: function(fd, len) {
var stream = FS.getStream(fd);
if (!stream) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
if ((stream.flags & {{{ cDefine('O_ACCMODE') }}}) === {{{ cDefine('O_RDONLY')}}}) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
FS.truncate(stream.node, len);
},
utime: function(path, atime, mtime) {
var lookup = FS.lookupPath(path, { follow: true });
var node = lookup.node;
node.node_ops.setattr(node, {
timestamp: Math.max(atime, mtime)
});
},
open: function(path, flags, mode, fd_start, fd_end) {
if (path === "") {
throw new FS.ErrnoError(ERRNO_CODES.ENOENT);
}
flags = typeof flags === 'string' ? FS.modeStringToFlags(flags) : flags;
mode = typeof mode === 'undefined' ? 438 /* 0666 */ : mode;
if ((flags & {{{ cDefine('O_CREAT') }}})) {
mode = (mode & {{{ cDefine('S_IALLUGO') }}}) | {{{ cDefine('S_IFREG') }}};
} else {
mode = 0;
}
var node;
if (typeof path === 'object') {
node = path;
} else {
path = PATH.normalize(path);
try {
var lookup = FS.lookupPath(path, {
follow: !(flags & {{{ cDefine('O_NOFOLLOW') }}})
});
node = lookup.node;
} catch (e) {
// ignore
}
}
// perhaps we need to create the node
var created = false;
if ((flags & {{{ cDefine('O_CREAT') }}})) {
if (node) {
// if O_CREAT and O_EXCL are set, error out if the node already exists
if ((flags & {{{ cDefine('O_EXCL') }}})) {
throw new FS.ErrnoError(ERRNO_CODES.EEXIST);
}
} else {
// node doesn't exist, try to create it
node = FS.mknod(path, mode, 0);
created = true;
}
}
if (!node) {
throw new FS.ErrnoError(ERRNO_CODES.ENOENT);
}
// can't truncate a device
if (FS.isChrdev(node.mode)) {
flags &= ~{{{ cDefine('O_TRUNC') }}};
}
// check permissions, if this is not a file we just created now (it is ok to
// create and write to a file with read-only permissions; it is read-only
// for later use)
if (!created) {
var err = FS.mayOpen(node, flags);
if (err) {
throw new FS.ErrnoError(err);
}
}
// do truncation if necessary
if ((flags & {{{ cDefine('O_TRUNC')}}})) {
FS.truncate(node, 0);
}
// we've already handled these, don't pass down to the underlying vfs
flags &= ~({{{ cDefine('O_EXCL') }}} | {{{ cDefine('O_TRUNC') }}});
// register the stream with the filesystem
var stream = FS.createStream({
node: node,
path: FS.getPath(node), // we want the absolute path to the node
flags: flags,
seekable: true,
position: 0,
stream_ops: node.stream_ops,
// used by the file family libc calls (fopen, fwrite, ferror, etc.)
ungotten: [],
error: false
}, fd_start, fd_end);
// call the new stream's open function
if (stream.stream_ops.open) {
stream.stream_ops.open(stream);
}
if (Module['logReadFiles'] && !(flags & {{{ cDefine('O_WRONLY')}}})) {
if (!FS.readFiles) FS.readFiles = {};
if (!(path in FS.readFiles)) {
FS.readFiles[path] = 1;
Module['printErr']('read file: ' + path);
}
}
try {
if (FS.trackingDelegate['onOpenFile']) {
var trackingFlags = 0;
if ((flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_WRONLY') }}}) {
trackingFlags |= FS.tracking.openFlags.READ;
}
if ((flags & {{{ cDefine('O_ACCMODE') }}}) !== {{{ cDefine('O_RDONLY') }}}) {
trackingFlags |= FS.tracking.openFlags.WRITE;
}
FS.trackingDelegate['onOpenFile'](path, trackingFlags);
}
} catch(e) {
console.log("FS.trackingDelegate['onOpenFile']('"+path+"', flags) threw an exception: " + e.message);
}
return stream;
},
close: function(stream) {
try {
if (stream.stream_ops.close) {
stream.stream_ops.close(stream);
}
} catch (e) {
throw e;
} finally {
FS.closeStream(stream.fd);
}
},
llseek: function(stream, offset, whence) {
if (!stream.seekable || !stream.stream_ops.llseek) {
throw new FS.ErrnoError(ERRNO_CODES.ESPIPE);
}
return stream.stream_ops.llseek(stream, offset, whence);
},
read: function(stream, buffer, offset, length, position) {
if (length < 0 || position < 0) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
if ((stream.flags & {{{ cDefine('O_ACCMODE') }}}) === {{{ cDefine('O_WRONLY')}}}) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
if (FS.isDir(stream.node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EISDIR);
}
if (!stream.stream_ops.read) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
var seeking = true;
if (typeof position === 'undefined') {
position = stream.position;
seeking = false;
} else if (!stream.seekable) {
throw new FS.ErrnoError(ERRNO_CODES.ESPIPE);
}
var bytesRead = stream.stream_ops.read(stream, buffer, offset, length, position);
if (!seeking) stream.position += bytesRead;
return bytesRead;
},
write: function(stream, buffer, offset, length, position, canOwn) {
if (length < 0 || position < 0) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
if ((stream.flags & {{{ cDefine('O_ACCMODE') }}}) === {{{ cDefine('O_RDONLY')}}}) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
if (FS.isDir(stream.node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EISDIR);
}
if (!stream.stream_ops.write) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
if (stream.flags & {{{ cDefine('O_APPEND') }}}) {
// seek to the end before writing in append mode
FS.llseek(stream, 0, {{{ cDefine('SEEK_END') }}});
}
var seeking = true;
if (typeof position === 'undefined') {
position = stream.position;
seeking = false;
} else if (!stream.seekable) {
throw new FS.ErrnoError(ERRNO_CODES.ESPIPE);
}
var bytesWritten = stream.stream_ops.write(stream, buffer, offset, length, position, canOwn);
if (!seeking) stream.position += bytesWritten;
try {
if (stream.path && FS.trackingDelegate['onWriteToFile']) FS.trackingDelegate['onWriteToFile'](stream.path);
} catch(e) {
console.log("FS.trackingDelegate['onWriteToFile']('"+path+"') threw an exception: " + e.message);
}
return bytesWritten;
},
allocate: function(stream, offset, length) {
if (offset < 0 || length <= 0) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
if ((stream.flags & {{{ cDefine('O_ACCMODE') }}}) === {{{ cDefine('O_RDONLY')}}}) {
throw new FS.ErrnoError(ERRNO_CODES.EBADF);
}
if (!FS.isFile(stream.node.mode) && !FS.isDir(node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.ENODEV);
}
if (!stream.stream_ops.allocate) {
throw new FS.ErrnoError(ERRNO_CODES.EOPNOTSUPP);
}
stream.stream_ops.allocate(stream, offset, length);
},
mmap: function(stream, buffer, offset, length, position, prot, flags) {
// TODO if PROT is PROT_WRITE, make sure we have write access
if ((stream.flags & {{{ cDefine('O_ACCMODE') }}}) === {{{ cDefine('O_WRONLY')}}}) {
throw new FS.ErrnoError(ERRNO_CODES.EACCES);
}
if (!stream.stream_ops.mmap) {
throw new FS.ErrnoError(ERRNO_CODES.ENODEV);
}
return stream.stream_ops.mmap(stream, buffer, offset, length, position, prot, flags);
},
ioctl: function(stream, cmd, arg) {
if (!stream.stream_ops.ioctl) {
throw new FS.ErrnoError(ERRNO_CODES.ENOTTY);
}
return stream.stream_ops.ioctl(stream, cmd, arg);
},
readFile: function(path, opts) {
opts = opts || {};
opts.flags = opts.flags || 'r';
opts.encoding = opts.encoding || 'binary';
if (opts.encoding !== 'utf8' && opts.encoding !== 'binary') {
throw new Error('Invalid encoding type "' + opts.encoding + '"');
}
var ret;
var stream = FS.open(path, opts.flags);
var stat = FS.stat(path);
var length = stat.size;
var buf = new Uint8Array(length);
FS.read(stream, buf, 0, length, 0);
if (opts.encoding === 'utf8') {
ret = '';
var utf8 = new Runtime.UTF8Processor();
for (var i = 0; i < length; i++) {
ret += utf8.processCChar(buf[i]);
}
} else if (opts.encoding === 'binary') {
ret = buf;
}
FS.close(stream);
return ret;
},
writeFile: function(path, data, opts) {
opts = opts || {};
opts.flags = opts.flags || 'w';
opts.encoding = opts.encoding || 'utf8';
if (opts.encoding !== 'utf8' && opts.encoding !== 'binary') {
throw new Error('Invalid encoding type "' + opts.encoding + '"');
}
var stream = FS.open(path, opts.flags, opts.mode);
if (opts.encoding === 'utf8') {
var utf8 = new Runtime.UTF8Processor();
var buf = new Uint8Array(utf8.processJSString(data));
FS.write(stream, buf, 0, buf.length, 0, opts.canOwn);
} else if (opts.encoding === 'binary') {
FS.write(stream, data, 0, data.length, 0, opts.canOwn);
}
FS.close(stream);
},
//
// module-level FS code
//
cwd: function() {
return FS.currentPath;
},
chdir: function(path) {
var lookup = FS.lookupPath(path, { follow: true });
if (!FS.isDir(lookup.node.mode)) {
throw new FS.ErrnoError(ERRNO_CODES.ENOTDIR);
}
var err = FS.nodePermissions(lookup.node, 'x');
if (err) {
throw new FS.ErrnoError(err);
}
FS.currentPath = lookup.path;
},
createDefaultDirectories: function() {
FS.mkdir('/tmp');
FS.mkdir('/home');
FS.mkdir('/home/web_user');
},
createDefaultDevices: function() {
// create /dev
FS.mkdir('/dev');
// setup /dev/null
FS.registerDevice(FS.makedev(1, 3), {
read: function() { return 0; },
write: function() { return 0; }
});
FS.mkdev('/dev/null', FS.makedev(1, 3));
// setup /dev/tty and /dev/tty1
// stderr needs to print output using Module['printErr']
// so we register a second tty just for it.
TTY.register(FS.makedev(5, 0), TTY.default_tty_ops);
TTY.register(FS.makedev(6, 0), TTY.default_tty1_ops);
FS.mkdev('/dev/tty', FS.makedev(5, 0));
FS.mkdev('/dev/tty1', FS.makedev(6, 0));
// setup /dev/[u]random
var random_device;
if (typeof crypto !== 'undefined') {
// for modern web browsers
var randomBuffer = new Uint8Array(1);
random_device = function() { crypto.getRandomValues(randomBuffer); return randomBuffer[0]; };
} else if (ENVIRONMENT_IS_NODE) {
// for nodejs
random_device = function() { return require('crypto').randomBytes(1)[0]; };
} else {
// default for ES5 platforms
random_device = function() { return Math.floor(Math.random()*256); };
}
FS.createDevice('/dev', 'random', random_device);
FS.createDevice('/dev', 'urandom', random_device);
// we're not going to emulate the actual shm device,
// just create the tmp dirs that reside in it commonly
FS.mkdir('/dev/shm');
FS.mkdir('/dev/shm/tmp');
},
createStandardStreams: function() {
// TODO deprecate the old functionality of a single
// input / output callback and that utilizes FS.createDevice
// and instead require a unique set of stream ops
// by default, we symlink the standard streams to the
// default tty devices. however, if the standard streams
// have been overwritten we create a unique device for
// them instead.
if (Module['stdin']) {
FS.createDevice('/dev', 'stdin', Module['stdin']);
} else {
FS.symlink('/dev/tty', '/dev/stdin');
}
if (Module['stdout']) {
FS.createDevice('/dev', 'stdout', null, Module['stdout']);
} else {
FS.symlink('/dev/tty', '/dev/stdout');
}
if (Module['stderr']) {
FS.createDevice('/dev', 'stderr', null, Module['stderr']);
} else {
FS.symlink('/dev/tty1', '/dev/stderr');
}
// open default streams for the stdin, stdout and stderr devices
var stdin = FS.open('/dev/stdin', 'r');
{{{ makeSetValue(makeGlobalUse('_stdin'), 0, 'FS.getPtrForStream(stdin)', 'void*') }}};
assert(stdin.fd === 0, 'invalid handle for stdin (' + stdin.fd + ')');
var stdout = FS.open('/dev/stdout', 'w');
{{{ makeSetValue(makeGlobalUse('_stdout'), 0, 'FS.getPtrForStream(stdout)', 'void*') }}};
assert(stdout.fd === 1, 'invalid handle for stdout (' + stdout.fd + ')');
var stderr = FS.open('/dev/stderr', 'w');
{{{ makeSetValue(makeGlobalUse('_stderr'), 0, 'FS.getPtrForStream(stderr)', 'void*') }}};
assert(stderr.fd === 2, 'invalid handle for stderr (' + stderr.fd + ')');
},
ensureErrnoError: function() {
if (FS.ErrnoError) return;
FS.ErrnoError = function ErrnoError(errno) {
this.errno = errno;
for (var key in ERRNO_CODES) {
if (ERRNO_CODES[key] === errno) {
this.code = key;
break;
}
}
this.message = ERRNO_MESSAGES[errno];
#if ASSERTIONS
if (this.stack) this.stack = demangleAll(this.stack);
#endif
};
FS.ErrnoError.prototype = new Error();
FS.ErrnoError.prototype.constructor = FS.ErrnoError;
// Some errors may happen quite a bit, to avoid overhead we reuse them (and suffer a lack of stack info)
[ERRNO_CODES.ENOENT].forEach(function(code) {
FS.genericErrors[code] = new FS.ErrnoError(code);
FS.genericErrors[code].stack = '<generic error, no stack>';
});
},
staticInit: function() {
FS.ensureErrnoError();
FS.nameTable = new Array(4096);
FS.mount(MEMFS, {}, '/');
FS.createDefaultDirectories();
FS.createDefaultDevices();
},
init: function(input, output, error) {
assert(!FS.init.initialized, 'FS.init was previously called. If you want to initialize later with custom parameters, remove any earlier calls (note that one is automatically added to the generated code)');
FS.init.initialized = true;
FS.ensureErrnoError();
// Allow Module.stdin etc. to provide defaults, if none explicitly passed to us here
Module['stdin'] = input || Module['stdin'];
Module['stdout'] = output || Module['stdout'];
Module['stderr'] = error || Module['stderr'];
FS.createStandardStreams();
},
quit: function() {
FS.init.initialized = false;
for (var i = 0; i < FS.streams.length; i++) {
var stream = FS.streams[i];
if (!stream) {
continue;
}
FS.close(stream);
}
},
//
// old v1 compatibility functions
//
getMode: function(canRead, canWrite) {
var mode = 0;
if (canRead) mode |= {{{ cDefine('S_IRUGO') }}} | {{{ cDefine('S_IXUGO') }}};
if (canWrite) mode |= {{{ cDefine('S_IWUGO') }}};
return mode;
},
joinPath: function(parts, forceRelative) {
var path = PATH.join.apply(null, parts);
if (forceRelative && path[0] == '/') path = path.substr(1);
return path;
},
absolutePath: function(relative, base) {
return PATH.resolve(base, relative);
},
standardizePath: function(path) {
return PATH.normalize(path);
},
findObject: function(path, dontResolveLastLink) {
var ret = FS.analyzePath(path, dontResolveLastLink);
if (ret.exists) {
return ret.object;
} else {
___setErrNo(ret.error);
return null;
}
},
analyzePath: function(path, dontResolveLastLink) {
// operate from within the context of the symlink's target
try {
var lookup = FS.lookupPath(path, { follow: !dontResolveLastLink });
path = lookup.path;
} catch (e) {
}
var ret = {
isRoot: false, exists: false, error: 0, name: null, path: null, object: null,
parentExists: false, parentPath: null, parentObject: null
};
try {
var lookup = FS.lookupPath(path, { parent: true });
ret.parentExists = true;
ret.parentPath = lookup.path;
ret.parentObject = lookup.node;
ret.name = PATH.basename(path);
lookup = FS.lookupPath(path, { follow: !dontResolveLastLink });
ret.exists = true;
ret.path = lookup.path;
ret.object = lookup.node;
ret.name = lookup.node.name;
ret.isRoot = lookup.path === '/';
} catch (e) {
ret.error = e.errno;
};
return ret;
},
createFolder: function(parent, name, canRead, canWrite) {
var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
var mode = FS.getMode(canRead, canWrite);
return FS.mkdir(path, mode);
},
createPath: function(parent, path, canRead, canWrite) {
parent = typeof parent === 'string' ? parent : FS.getPath(parent);
var parts = path.split('/').reverse();
while (parts.length) {
var part = parts.pop();
if (!part) continue;
var current = PATH.join2(parent, part);
try {
FS.mkdir(current);
} catch (e) {
// ignore EEXIST
}
parent = current;
}
return current;
},
createFile: function(parent, name, properties, canRead, canWrite) {
var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
var mode = FS.getMode(canRead, canWrite);
return FS.create(path, mode);
},
createDataFile: function(parent, name, data, canRead, canWrite, canOwn) {
var path = name ? PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name) : parent;
var mode = FS.getMode(canRead, canWrite);
var node = FS.create(path, mode);
if (data) {
if (typeof data === 'string') {
var arr = new Array(data.length);
for (var i = 0, len = data.length; i < len; ++i) arr[i] = data.charCodeAt(i);
data = arr;
}
// make sure we can write to the file
FS.chmod(node, mode | {{{ cDefine('S_IWUGO') }}});
var stream = FS.open(node, 'w');
FS.write(stream, data, 0, data.length, 0, canOwn);
FS.close(stream);
FS.chmod(node, mode);
}
return node;
},
createDevice: function(parent, name, input, output) {
var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
var mode = FS.getMode(!!input, !!output);
if (!FS.createDevice.major) FS.createDevice.major = 64;
var dev = FS.makedev(FS.createDevice.major++, 0);
// Create a fake device that a set of stream ops to emulate
// the old behavior.
FS.registerDevice(dev, {
open: function(stream) {
stream.seekable = false;
},
close: function(stream) {
// flush any pending line data
if (output && output.buffer && output.buffer.length) {
output({{{ charCode('\n') }}});
}
},
read: function(stream, buffer, offset, length, pos /* ignored */) {
var bytesRead = 0;
for (var i = 0; i < length; i++) {
var result;
try {
result = input();
} catch (e) {
throw new FS.ErrnoError(ERRNO_CODES.EIO);
}
if (result === undefined && bytesRead === 0) {
throw new FS.ErrnoError(ERRNO_CODES.EAGAIN);
}
if (result === null || result === undefined) break;
bytesRead++;
buffer[offset+i] = result;
}
if (bytesRead) {
stream.node.timestamp = Date.now();
}
return bytesRead;
},
write: function(stream, buffer, offset, length, pos) {
for (var i = 0; i < length; i++) {
try {
output(buffer[offset+i]);
} catch (e) {
throw new FS.ErrnoError(ERRNO_CODES.EIO);
}
}
if (length) {
stream.node.timestamp = Date.now();
}
return i;
}
});
return FS.mkdev(path, mode, dev);
},
createLink: function(parent, name, target, canRead, canWrite) {
var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
return FS.symlink(target, path);
},
// Makes sure a file's contents are loaded. Returns whether the file has
// been loaded successfully. No-op for files that have been loaded already.
forceLoadFile: function(obj) {
if (obj.isDevice || obj.isFolder || obj.link || obj.contents) return true;
var success = true;
if (typeof XMLHttpRequest !== 'undefined') {
throw new Error("Lazy loading should have been performed (contents set) in createLazyFile, but it was not. Lazy loading only works in web workers. Use --embed-file or --preload-file in emcc on the main thread.");
} else if (Module['read']) {
// Command-line.
try {
// WARNING: Can't read binary files in V8's d8 or tracemonkey's js, as
// read() will try to parse UTF8.
obj.contents = intArrayFromString(Module['read'](obj.url), true);
obj.usedBytes = obj.contents.length;
} catch (e) {
success = false;
}
} else {
throw new Error('Cannot load without read() or XMLHttpRequest.');
}
if (!success) ___setErrNo(ERRNO_CODES.EIO);
return success;
},
// Creates a file record for lazy-loading from a URL. XXX This requires a synchronous
// XHR, which is not possible in browsers except in a web worker! Use preloading,
// either --preload-file in emcc or FS.createPreloadedFile
createLazyFile: function(parent, name, url, canRead, canWrite) {
// Lazy chunked Uint8Array (implements get and length from Uint8Array). Actual getting is abstracted away for eventual reuse.
function LazyUint8Array() {
this.lengthKnown = false;
this.chunks = []; // Loaded chunks. Index is the chunk number
}
LazyUint8Array.prototype.get = function LazyUint8Array_get(idx) {
if (idx > this.length-1 || idx < 0) {
return undefined;
}
var chunkOffset = idx % this.chunkSize;
var chunkNum = Math.floor(idx / this.chunkSize);
return this.getter(chunkNum)[chunkOffset];
}
LazyUint8Array.prototype.setDataGetter = function LazyUint8Array_setDataGetter(getter) {
this.getter = getter;
}
LazyUint8Array.prototype.cacheLength = function LazyUint8Array_cacheLength() {
// Find length
var xhr = new XMLHttpRequest();
xhr.open('HEAD', url, false);
xhr.send(null);
if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
var datalength = Number(xhr.getResponseHeader("Content-length"));
var header;
var hasByteServing = (header = xhr.getResponseHeader("Accept-Ranges")) && header === "bytes";
#if SMALL_XHR_CHUNKS
var chunkSize = 1024; // Chunk size in bytes
#else
var chunkSize = 1024*1024; // Chunk size in bytes
#endif
if (!hasByteServing) chunkSize = datalength;
// Function to get a range from the remote URL.
var doXHR = (function(from, to) {
if (from > to) throw new Error("invalid range (" + from + ", " + to + ") or no bytes requested!");
if (to > datalength-1) throw new Error("only " + datalength + " bytes available! programmer error!");
// TODO: Use mozResponseArrayBuffer, responseStream, etc. if available.
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
if (datalength !== chunkSize) xhr.setRequestHeader("Range", "bytes=" + from + "-" + to);
// Some hints to the browser that we want binary data.
if (typeof Uint8Array != 'undefined') xhr.responseType = 'arraybuffer';
if (xhr.overrideMimeType) {
xhr.overrideMimeType('text/plain; charset=x-user-defined');
}
xhr.send(null);
if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
if (xhr.response !== undefined) {
return new Uint8Array(xhr.response || []);
} else {
return intArrayFromString(xhr.responseText || '', true);
}
});
var lazyArray = this;
lazyArray.setDataGetter(function(chunkNum) {
var start = chunkNum * chunkSize;
var end = (chunkNum+1) * chunkSize - 1; // including this byte
end = Math.min(end, datalength-1); // if datalength-1 is selected, this is the last block
if (typeof(lazyArray.chunks[chunkNum]) === "undefined") {
lazyArray.chunks[chunkNum] = doXHR(start, end);
}
if (typeof(lazyArray.chunks[chunkNum]) === "undefined") throw new Error("doXHR failed!");
return lazyArray.chunks[chunkNum];
});
this._length = datalength;
this._chunkSize = chunkSize;
this.lengthKnown = true;
}
if (typeof XMLHttpRequest !== 'undefined') {
if (!ENVIRONMENT_IS_WORKER) throw 'Cannot do synchronous binary XHRs outside webworkers in modern browsers. Use --embed-file or --preload-file in emcc';
var lazyArray = new LazyUint8Array();
Object.defineProperty(lazyArray, "length", {
get: function() {
if(!this.lengthKnown) {
this.cacheLength();
}
return this._length;
}
});
Object.defineProperty(lazyArray, "chunkSize", {
get: function() {
if(!this.lengthKnown) {
this.cacheLength();
}
return this._chunkSize;
}
});
var properties = { isDevice: false, contents: lazyArray };
} else {
var properties = { isDevice: false, url: url };
}
var node = FS.createFile(parent, name, properties, canRead, canWrite);
// This is a total hack, but I want to get this lazy file code out of the
// core of MEMFS. If we want to keep this lazy file concept I feel it should
// be its own thin LAZYFS proxying calls to MEMFS.
if (properties.contents) {
node.contents = properties.contents;
} else if (properties.url) {
node.contents = null;
node.url = properties.url;
}
// Add a function that defers querying the file size until it is asked the first time.
Object.defineProperty(node, "usedBytes", {
get: function() { return this.contents.length; }
});
// override each stream op with one that tries to force load the lazy file first
var stream_ops = {};
var keys = Object.keys(node.stream_ops);
keys.forEach(function(key) {
var fn = node.stream_ops[key];
stream_ops[key] = function forceLoadLazyFile() {
if (!FS.forceLoadFile(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EIO);
}
return fn.apply(null, arguments);
};
});
// use a custom read function
stream_ops.read = function stream_ops_read(stream, buffer, offset, length, position) {
if (!FS.forceLoadFile(node)) {
throw new FS.ErrnoError(ERRNO_CODES.EIO);
}
var contents = stream.node.contents;
if (position >= contents.length)
return 0;
var size = Math.min(contents.length - position, length);
assert(size >= 0);
if (contents.slice) { // normal array
for (var i = 0; i < size; i++) {
buffer[offset + i] = contents[position + i];
}
} else {
for (var i = 0; i < size; i++) { // LazyUint8Array from sync binary XHR
buffer[offset + i] = contents.get(position + i);
}
}
return size;
};
node.stream_ops = stream_ops;
return node;
},
// Preloads a file asynchronously. You can call this before run, for example in
// preRun. run will be delayed until this file arrives and is set up.
// If you call it after run(), you may want to pause the main loop until it
// completes, if so, you can use the onload parameter to be notified when
// that happens.
// In addition to normally creating the file, we also asynchronously preload
// the browser-friendly versions of it: For an image, we preload an Image
// element and for an audio, and Audio. These are necessary for SDL_Image
// and _Mixer to find the files in preloadedImages/Audios.
// You can also call this with a typed array instead of a url. It will then
// do preloading for the Image/Audio part, as if the typed array were the
// result of an XHR that you did manually.
createPreloadedFile: function(parent, name, url, canRead, canWrite, onload, onerror, dontCreateFile, canOwn) {
Browser.init();
// TODO we should allow people to just pass in a complete filename instead
// of parent and name being that we just join them anyways
var fullname = name ? PATH.resolve(PATH.join2(parent, name)) : parent;
function processData(byteArray) {
function finish(byteArray) {
if (!dontCreateFile) {
FS.createDataFile(parent, name, byteArray, canRead, canWrite, canOwn);
}
if (onload) onload();
removeRunDependency('cp ' + fullname);
}
var handled = false;
Module['preloadPlugins'].forEach(function(plugin) {
if (handled) return;
if (plugin['canHandle'](fullname)) {
plugin['handle'](byteArray, fullname, finish, function() {
if (onerror) onerror();
removeRunDependency('cp ' + fullname);
});
handled = true;
}
});
if (!handled) finish(byteArray);
}
addRunDependency('cp ' + fullname);
if (typeof url == 'string') {
Browser.asyncLoad(url, function(byteArray) {
processData(byteArray);
}, onerror);
} else {
processData(url);
}
},
//
// persistence
//
indexedDB: function() {
return window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
},
DB_NAME: function() {
return 'EM_FS_' + window.location.pathname;
},
DB_VERSION: 20,
DB_STORE_NAME: 'FILE_DATA',
// asynchronously saves a list of files to an IndexedDB. The DB will be created if not already existing.
saveFilesToDB: function(paths, onload, onerror) {
onload = onload || function(){};
onerror = onerror || function(){};
var indexedDB = FS.indexedDB();
try {
var openRequest = indexedDB.open(FS.DB_NAME(), FS.DB_VERSION);
} catch (e) {
return onerror(e);
}
openRequest.onupgradeneeded = function openRequest_onupgradeneeded() {
console.log('creating db');
var db = openRequest.result;
db.createObjectStore(FS.DB_STORE_NAME);
};
openRequest.onsuccess = function openRequest_onsuccess() {
var db = openRequest.result;
var transaction = db.transaction([FS.DB_STORE_NAME], 'readwrite');
var files = transaction.objectStore(FS.DB_STORE_NAME);
var ok = 0, fail = 0, total = paths.length;
function finish() {
if (fail == 0) onload(); else onerror();
}
paths.forEach(function(path) {
var putRequest = files.put(FS.analyzePath(path).object.contents, path);
putRequest.onsuccess = function putRequest_onsuccess() { ok++; if (ok + fail == total) finish() };
putRequest.onerror = function putRequest_onerror() { fail++; if (ok + fail == total) finish() };
});
transaction.onerror = onerror;
};
openRequest.onerror = onerror;
},
// asychronously loads a file from IndexedDB.
loadFilesFromDB: function(paths, onload, onerror) {
onload = onload || function(){};
onerror = onerror || function(){};
var indexedDB = FS.indexedDB();
try {
var openRequest = indexedDB.open(FS.DB_NAME(), FS.DB_VERSION);
} catch (e) {
return onerror(e);
}
openRequest.onupgradeneeded = onerror; // no database to load from
openRequest.onsuccess = function openRequest_onsuccess() {
var db = openRequest.result;
try {
var transaction = db.transaction([FS.DB_STORE_NAME], 'readonly');
} catch(e) {
onerror(e);
return;
}
var files = transaction.objectStore(FS.DB_STORE_NAME);
var ok = 0, fail = 0, total = paths.length;
function finish() {
if (fail == 0) onload(); else onerror();
}
paths.forEach(function(path) {
var getRequest = files.get(path);
getRequest.onsuccess = function getRequest_onsuccess() {
if (FS.analyzePath(path).exists) {
FS.unlink(path);
}
FS.createDataFile(PATH.dirname(path), PATH.basename(path), getRequest.result, true, true, true);
ok++;
if (ok + fail == total) finish();
};
getRequest.onerror = function getRequest_onerror() { fail++; if (ok + fail == total) finish() };
});
transaction.onerror = onerror;
};
openRequest.onerror = onerror;
}
}
});
Computing file changes ...
