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library.js
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library.js
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// This file is part of gltfpack and is distributed under the terms of MIT License.
/**
* Initialize the library with the Wasm module (library.wasm)
*
* @param wasm Promise with contents of library.wasm
*
* Note: this is called automatically in node.js
*/
function init(wasm) {
if (ready) {
throw new Error("init must be called once");
}
ready = Promise.resolve(wasm)
.then(function (buffer) {
return WebAssembly.instantiate(buffer, { wasi_snapshot_preview1: wasi });
})
.then(function (result) {
instance = result.instance;
instance.exports.__wasm_call_ctors();
});
}
/**
* Pack the requested glTF data using the requested command line and access interface.
*
* @param args An array of strings with the input arguments; the paths for input and output files are interpreted by the interface
* @param iface An interface to the system that will be used to service file requests and other system calls
* @return Promise that indicates completion of the operation
*
* iface should contain the following methods:
* read(path): Given a path, return a Uint8Array with the contents of that path
* write(path, data): Write the specified Uint8Array to the provided path
*/
function pack(args, iface) {
if (!ready) {
throw new Error("init must be called before pack");
}
var argv = args.slice();
argv.unshift("gltfpack");
return ready.then(function () {
var buf = uploadArgv(argv);
output.position = 0;
output.size = 0;
fs_interface = iface;
var result = instance.exports.pack(argv.length, buf);
fs_interface = undefined;
instance.exports.free(buf);
var log = getString(output.data.buffer, 0, output.size);
if (result != 0) {
throw new Error(log);
} else {
return log;
}
});
}
// Library implementation (here be dragons)
var WASI_EBADF = 8;
var WASI_EINVAL = 28;
var WASI_EIO = 29;
var WASI_ENOSYS = 52;
var ready;
var instance;
var fs_interface;
var output = { data: new Uint8Array(), position: 0, size: 0 };
var fds = { 1: output, 2: output, 3: { mount: "/", path: "/" }, 4: { mount: "/gltfpack-$pwd", path: "" } };
var wasi = {
proc_exit: function(rval) {
},
fd_close: function(fd) {
if (!fds[fd]) {
return WASI_EBADF;
}
try {
if (fds[fd].close) {
fds[fd].close();
}
fds[fd] = undefined;
return 0;
} catch (err) {
fds[fd] = undefined;
return WASI_EIO;
}
},
fd_fdstat_get: function(fd, stat) {
if (!fds[fd]) {
return WASI_EBADF;
}
var heap = getHeap();
heap.setUint8(stat + 0, fds[fd].path !== undefined ? 3 : 4);
heap.setUint16(stat + 2, 0, true);
heap.setUint32(stat + 8, 0, true);
heap.setUint32(stat + 12, 0, true);
heap.setUint32(stat + 16, 0, true);
heap.setUint32(stat + 20, 0, true);
return 0;
},
path_open32: function(parent_fd, dirflags, path, path_len, oflags, fs_rights_base, fs_rights_inheriting, fdflags, opened_fd) {
if (!fds[parent_fd] || fds[parent_fd].path === undefined) {
return WASI_EBADF;
}
var heap = getHeap();
var file = {};
file.name = fds[parent_fd].path + getString(heap.buffer, path, path_len);
file.position = 0;
if (oflags & 1) {
file.data = new Uint8Array(4096);
file.size = 0;
file.close = function () {
fs_interface.write(file.name, new Uint8Array(file.data.buffer, 0, file.size));
};
} else {
try {
file.data = fs_interface.read(file.name);
if (!file.data) {
return WASI_EIO;
}
file.size = file.data.length;
} catch (err) {
return WASI_EIO;
}
}
var fd = nextFd();
fds[fd] = file;
heap.setUint32(opened_fd, fd, true);
return 0;
},
path_filestat_get: function(parent_fd, flags, path, path_len, buf) {
if (!fds[parent_fd] || fds[parent_fd].path === undefined) {
return WASI_EBADF;
}
var heap = getHeap();
var name = getString(heap.buffer, path, path_len);
var heap = getHeap();
for (var i = 0; i < 64; ++i)
heap.setUint8(buf + i, 0);
heap.setUint8(buf + 16, name == "." ? 3 : 4);
return 0;
},
fd_prestat_get: function(fd, buf) {
if (!fds[fd] || fds[fd].path === undefined) {
return WASI_EBADF;
}
var path_buf = stringBuffer(fds[fd].mount);
var heap = getHeap();
heap.setUint8(buf, 0);
heap.setUint32(buf + 4, path_buf.length, true);
return 0;
},
fd_prestat_dir_name: function(fd, path, path_len) {
if (!fds[fd] || fds[fd].path === undefined) {
return WASI_EBADF;
}
var path_buf = stringBuffer(fds[fd].mount);
if (path_len != path_buf.length) {
return WASI_EINVAL;
}
var heap = getHeap();
new Uint8Array(heap.buffer).set(path_buf, path);
return 0;
},
path_remove_directory: function(parent_fd, path, path_len) {
return WASI_EINVAL;
},
fd_fdstat_set_flags: function(fd, flags) {
return WASI_ENOSYS;
},
fd_seek32: function(fd, offset, whence, newoffset) {
if (!fds[fd]) {
return WASI_EBADF;
}
var newposition;
switch (whence) {
case 0:
newposition = offset;
break;
case 1:
newposition = fds[fd].position + offset;
break;
case 2:
newposition = fds[fd].size;
break;
default:
return WASI_EINVAL;
}
if (newposition > fds[fd].size) {
return WASI_EINVAL;
}
fds[fd].position = newposition;
var heap = getHeap();
heap.setUint32(newoffset, newposition, true);
return 0;
},
fd_read: function(fd, iovs, iovs_len, nread) {
if (!fds[fd]) {
return WASI_EBADF;
}
var heap = getHeap();
var read = 0;
for (var i = 0; i < iovs_len; ++i) {
var buf = heap.getUint32(iovs + 8 * i + 0, true);
var buf_len = heap.getUint32(iovs + 8 * i + 4, true);
var readi = Math.min(fds[fd].size - fds[fd].position, buf_len);
new Uint8Array(heap.buffer).set(fds[fd].data.subarray(fds[fd].position, fds[fd].position + readi), buf);
fds[fd].position += readi;
read += readi;
}
heap.setUint32(nread, read, true);
return 0;
},
fd_write: function(fd, iovs, iovs_len, nwritten) {
if (!fds[fd]) {
return WASI_EBADF;
}
var heap = getHeap();
var written = 0;
for (var i = 0; i < iovs_len; ++i) {
var buf = heap.getUint32(iovs + 8 * i + 0, true);
var buf_len = heap.getUint32(iovs + 8 * i + 4, true);
if (fds[fd].position + buf_len > fds[fd].data.length) {
fds[fd].data = growArray(fds[fd].data, fds[fd].position + buf_len);
}
fds[fd].data.set(new Uint8Array(heap.buffer, buf, buf_len), fds[fd].position);
fds[fd].position += buf_len;
fds[fd].size = Math.max(fds[fd].position, fds[fd].size);
written += buf_len;
}
heap.setUint32(nwritten, written, true);
return 0;
},
};
function nextFd() {
for (var i = 1; ; ++i) {
if (fds[i] === undefined) {
return i;
}
}
}
function getHeap() {
return new DataView(instance.exports.memory.buffer);
}
function getString(buffer, offset, length) {
return new TextDecoder().decode(new Uint8Array(buffer, offset, length));
}
function stringBuffer(string) {
return new TextEncoder().encode(string);
}
function growArray(data, len) {
var new_length = Math.max(1, data.length);
while (new_length < len) {
new_length *= 2;
}
var new_data = new Uint8Array(new_length);
new_data.set(data);
return new_data;
}
function uploadArgv(argv) {
var buf_size = argv.length * 4;
for (var i = 0; i < argv.length; ++i) {
buf_size += stringBuffer(argv[i]).length + 1;
}
var buf = instance.exports.malloc(buf_size);
var argp = buf + argv.length * 4;
var heap = getHeap();
for (var i = 0; i < argv.length; ++i) {
var item = stringBuffer(argv[i]);
heap.setUint32(buf + i * 4, argp, true);
new Uint8Array(heap.buffer).set(item, argp);
heap.setUint8(argp + item.length, 0);
argp += item.length + 1;
}
return buf;
}
// Automatic initialization for node.js
if (typeof window === 'undefined' && typeof process !== 'undefined' && process.release.name === 'node') {
var fs = require('fs');
var util = require('util');
// Node versions before v12 don't support TextEncoder/TextDecoder natively, but util. provides compatible replacements
if (typeof TextEncoder === 'undefined' && typeof TextDecoder === 'undefined') {
TextEncoder = util.TextEncoder;
TextDecoder = util.TextDecoder;
}
init(fs.readFileSync(__dirname + '/library.wasm'));
}
// UMD
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
define([], factory);
} else if (typeof module === 'object' && module.exports) {
module.exports = factory();
} else {
root.gltfpack = factory();
}
}(typeof self !== 'undefined' ? self : this, function () {
return { init, pack };
}));