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/*!
* Library to detect file mime type of a Uint8Array.
*
* Modified from https://github.com/sindresorhus/file-type to be used standalone on browser based apps.
*
* This library requires Node "buffer" module as a pre-requisite. The "buffer" module is made available in this repo
* for standalone use via the `buffer.js` script which needs to be loaded before this file on the page.
*
* Author: Kartik Visweswaran, Krajee.com
*/
"use strict";
// ES5 POLYFILL HELPERS FOR ES6
function _typeof(obj) {
"@babel/helpers - typeof";
return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) {
return typeof obj;
} : function (obj) {
return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
}, _typeof(obj);
}
function _toConsumableArray(arr) {
return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread();
}
function _nonIterableSpread() {
throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _iterableToArray(iter) {
if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter);
}
function _arrayWithoutHoles(arr) {
if (Array.isArray(arr)) return _arrayLikeToArray(arr);
}
function _slicedToArray(arr, i) {
return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest();
}
function _nonIterableRest() {
throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _iterableToArrayLimit(arr, i) {
var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"];
if (_i == null) return;
var _arr = [];
var _n = true;
var _d = false;
var _s, _e;
try {
for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) {
_arr.push(_s.value);
if (i && _arr.length === i) break;
}
} catch (err) {
_d = true;
_e = err;
} finally {
try {
if (!_n && _i["return"] != null) _i["return"]();
} finally {
if (_d) throw _e;
}
}
return _arr;
}
function _arrayWithHoles(arr) {
if (Array.isArray(arr)) return arr;
}
function _createForOfIteratorHelper(o, allowArrayLike) {
var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"];
if (!it) {
if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") {
if (it) o = it;
var i = 0;
var F = function F() {
};
return {
s: F, n: function n() {
if (i >= o.length) return {done: true};
return {done: false, value: o[i++]};
}, e: function e(_e2) {
throw _e2;
}, f: F
};
}
throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
var normalCompletion = true, didErr = false, err;
return {
s: function s() {
it = it.call(o);
}, n: function n() {
var step = it.next();
normalCompletion = step.done;
return step;
}, e: function e(_e3) {
didErr = true;
err = _e3;
}, f: function f() {
try {
if (!normalCompletion && it.return != null) it.return();
} finally {
if (didErr) throw err;
}
}
};
}
function _unsupportedIterableToArray(o, minLen) {
if (!o) return;
if (typeof o === "string") return _arrayLikeToArray(o, minLen);
var n = Object.prototype.toString.call(o).slice(8, -1);
if (n === "Object" && o.constructor) n = o.constructor.name;
if (n === "Map" || n === "Set") return Array.from(o);
if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
}
function _arrayLikeToArray(arr, len) {
if (len == null || len > arr.length) len = arr.length;
for (var i = 0, arr2 = new Array(len); i < len; i++) {
arr2[i] = arr[i];
}
return arr2;
}
function _instanceof(left, right) {
if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) {
return !!right[Symbol.hasInstance](left);
} else {
return left instanceof right;
}
}
function _defineProperties(target, props) {
for (var i = 0; i < props.length; i++) {
var descriptor = props[i];
descriptor.enumerable = descriptor.enumerable || false;
descriptor.configurable = true;
if ("value" in descriptor) descriptor.writable = true;
Object.defineProperty(target, descriptor.key, descriptor);
}
}
function _createClass(Constructor, protoProps, staticProps) {
if (protoProps) _defineProperties(Constructor.prototype, protoProps);
if (staticProps) _defineProperties(Constructor, staticProps);
Object.defineProperty(Constructor, "prototype", {writable: false});
return Constructor;
}
function _classCallCheck(instance, Constructor) {
if (!_instanceof(instance, Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
function _inherits(subClass, superClass) {
if (typeof superClass !== "function" && superClass !== null) {
throw new TypeError("Super expression must either be null or a function");
}
subClass.prototype = Object.create(superClass && superClass.prototype, {
constructor: {
value: subClass,
writable: true,
configurable: true
}
});
Object.defineProperty(subClass, "prototype", {writable: false});
if (superClass) _setPrototypeOf(subClass, superClass);
}
function _createSuper(Derived) {
var hasNativeReflectConstruct = _isNativeReflectConstruct();
return function _createSuperInternal() {
var Super = _getPrototypeOf(Derived), result;
if (hasNativeReflectConstruct) {
var NewTarget = _getPrototypeOf(this).constructor;
result = Reflect.construct(Super, arguments, NewTarget);
} else {
result = Super.apply(this, arguments);
}
return _possibleConstructorReturn(this, result);
};
}
function _possibleConstructorReturn(self, call) {
if (call && (_typeof(call) === "object" || typeof call === "function")) {
return call;
} else if (call !== void 0) {
throw new TypeError("Derived constructors may only return object or undefined");
}
return _assertThisInitialized(self);
}
function _assertThisInitialized(self) {
if (self === void 0) {
throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
}
return self;
}
function _wrapNativeSuper(Class) {
var _cache = typeof Map === "function" ? new Map() : undefined;
_wrapNativeSuper = function _wrapNativeSuper(Class) {
if (Class === null || !_isNativeFunction(Class)) return Class;
if (typeof Class !== "function") {
throw new TypeError("Super expression must either be null or a function");
}
if (typeof _cache !== "undefined") {
if (_cache.has(Class)) return _cache.get(Class);
_cache.set(Class, Wrapper);
}
function Wrapper() {
return _construct(Class, arguments, _getPrototypeOf(this).constructor);
}
Wrapper.prototype = Object.create(Class.prototype, {
constructor: {
value: Wrapper,
enumerable: false,
writable: true,
configurable: true
}
});
return _setPrototypeOf(Wrapper, Class);
};
return _wrapNativeSuper(Class);
}
function _construct(Parent, args, Class) {
if (_isNativeReflectConstruct()) {
_construct = Reflect.construct.bind();
} else {
_construct = function _construct(Parent, args, Class) {
var a = [null];
a.push.apply(a, args);
var Constructor = Function.bind.apply(Parent, a);
var instance = new Constructor();
if (Class) _setPrototypeOf(instance, Class.prototype);
return instance;
};
}
return _construct.apply(null, arguments);
}
function _isNativeReflectConstruct() {
if (typeof Reflect === "undefined" || !Reflect.construct) return false;
if (Reflect.construct.sham) return false;
if (typeof Proxy === "function") return true;
try {
Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {
}));
return true;
} catch (e) {
return false;
}
}
function _isNativeFunction(fn) {
return Function.toString.call(fn).indexOf("[native code]") !== -1;
}
function _setPrototypeOf(o, p) {
_setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) {
o.__proto__ = p;
return o;
};
return _setPrototypeOf(o, p);
}
function _getPrototypeOf(o) {
_getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function _getPrototypeOf(o) {
return o.__proto__ || Object.getPrototypeOf(o);
};
return _getPrototypeOf(o);
}
// MAIN LIBRARY CODE
var KrajeeFileTypeConfig = {
minimumBytes: 4100,
// A fair amount of file-types are detectable within this range,
defaultMessages: 'End-Of-Stream',
tarHeaderChecksumMatches: function tarHeaderChecksumMatches(buffer) {
var offset = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
var readSum = Number.parseInt(buffer.toString('utf8', 148, 154).replace(/\0.*$/, '').trim(), 8); // Read sum in header
if (Number.isNaN(readSum)) {
return false;
}
var sum = 8 * 0x20; // Initialize signed bit sum
for (var i = offset; i < offset + 148; i++) {
sum += buffer[i];
}
for (var _i = offset + 156; _i < offset + 512; _i++) {
sum += buffer[_i];
}
return readSum === sum;
},
uint32SyncSafeToken: {
get: function get(buffer, offset) {
return buffer[offset + 3] & 0x7F | buffer[offset + 2] << 7 | buffer[offset + 1] << 14 | buffer[offset] << 21;
},
len: 4
},
dv: function dv(array) {
return new DataView(array.buffer, array.byteOffset);
},
Token: {
/**
* 8-bit unsigned integer
*/
UINT8: {
len: 1,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getUint8(offset);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setUint8(offset, value);
return offset + 1;
}
},
/**
* 16-bit unsigned integer, Little Endian byte order
*/
UINT16_LE: {
len: 2,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getUint16(offset, true);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setUint16(offset, value, true);
return offset + 2;
}
},
/**
* 16-bit unsigned integer, Big Endian byte order
*/
UINT16_BE: {
len: 2,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getUint16(offset);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setUint16(offset, value);
return offset + 2;
}
},
/**
* 32-bit unsigned integer, Big Endian byte order
*/
INT32_BE: {
len: 4,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getInt32(offset);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setInt32(offset, value);
return offset + 4;
}
},
/**
* 32-bit unsigned integer, Little Endian byte order
*/
UINT32_LE: {
len: 4,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getUint32(offset, true);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setUint32(offset, value, true);
return offset + 4;
}
},
/**
* 32-bit unsigned integer, Big Endian byte order
*/
UINT32_BE: {
len: 4,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getUint32(offset);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setUint32(offset, value);
return offset + 4;
}
},
/**
* 64-bit unsigned integer, Little Endian byte order
*/
UINT64_LE: {
len: 8,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getBigUint64(offset, true);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setBigUint64(offset, value, true);
return offset + 8;
}
},
/**
* 64-bit unsigned integer, Big Endian byte order
*/
UINT64_BE: {
len: 8,
get: function get(array, offset) {
return KrajeeFileTypeConfig.dv(array).getBigUint64(offset);
},
put: function put(array, offset, value) {
KrajeeFileTypeConfig.dv(array).setBigUint64(offset, value);
return offset + 8;
}
}
}
};
var EndOfStreamError = /*#__PURE__*/function (_Error) {
_inherits(EndOfStreamError, _Error);
var _super = _createSuper(EndOfStreamError);
function EndOfStreamError() {
_classCallCheck(this, EndOfStreamError);
return _super.call(this, KrajeeFileTypeConfig.defaultMessages);
}
return _createClass(EndOfStreamError);
}( /*#__PURE__*/_wrapNativeSuper(Error));
var StringType = /*#__PURE__*/function () {
function StringType(len, encoding) {
_classCallCheck(this, StringType);
this.len = len;
this.encoding = encoding;
}
_createClass(StringType, [{
key: "get",
value: function get(uint8Array, offset) {
return Buffer.from(uint8Array).toString(this.encoding, offset, offset + this.len);
}
}]);
return StringType;
}();
async function fileTypeFromTokenizer(tokenizer) {
try {
return new FileTypeParser().parse(tokenizer);
} catch (error) {
if (!_instanceof(error, EndOfStreamError)) {
throw error;
}
}
}
var BufferTokenizer = /*#__PURE__*/function () {
/**
* Construct BufferTokenizer
* @param uint8Array - Uint8Array to tokenize
* @param fileInfo - Pass additional file information to the tokenizer
*/
function BufferTokenizer(uint8Array, fileInfo) {
_classCallCheck(this, BufferTokenizer);
/**
* Tokenizer-stream position
*/
this.position = 0;
this.numBuffer = new Uint8Array(8);
this.fileInfo = fileInfo ? fileInfo : {};
this.uint8Array = uint8Array;
this.fileInfo.size = this.fileInfo.size ? this.fileInfo.size : uint8Array.length;
}
/**
* Read a token from the tokenizer-stream
* @param token - The token to read
* @param position - If provided, the desired position in the tokenizer-stream
* @returns Promise with token data
*/
_createClass(BufferTokenizer, [{
key: "readToken",
value: async function readToken(token) {
var position = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : this.position;
var uint8Array = Buffer.alloc(token.len);
var len = await this.readBuffer(uint8Array, {
position: position
});
if (len < token.len) throw new EndOfStreamError();
return token.get(uint8Array, 0);
}
/**
* Peek a token from the tokenizer-stream.
* @param token - Token to peek from the tokenizer-stream.
* @param position - Offset where to begin reading within the file. If position is null, data will be read from the current file position.
* @returns Promise with token data
*/
}, {
key: "peekToken",
value: async function peekToken(token) {
var position = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : this.position;
var uint8Array = Buffer.alloc(token.len);
var len = await this.peekBuffer(uint8Array, {
position: position
});
if (len < token.len) throw new EndOfStreamError();
return token.get(uint8Array, 0);
}
/**
* Read buffer from tokenizer
* @param uint8Array - Uint8Array to tokenize
* @param options - Read behaviour options
* @returns {Promise<number>}
*/
}, {
key: "readBuffer",
value: async function readBuffer(uint8Array, options) {
if (options && options.position) {
if (options.position < this.position) {
throw new Error('`options.position` must be equal or greater than `tokenizer.position`');
}
this.position = options.position;
}
var bytesRead = await this.peekBuffer(uint8Array, options);
this.position += bytesRead;
return bytesRead;
}
/**
* Peek (read ahead) buffer from tokenizer
* @param uint8Array
* @param options - Read behaviour options
* @returns {Promise<number>}
*/
}, {
key: "peekBuffer",
value: async function peekBuffer(uint8Array, options) {
var normOptions = this.normalizeOptions(uint8Array, options);
var bytes2read = Math.min(this.uint8Array.length - normOptions.position, normOptions.length);
if (!normOptions.mayBeLess && bytes2read < normOptions.length) {
throw new EndOfStreamError();
} else {
uint8Array.set(this.uint8Array.subarray(normOptions.position, normOptions.position + bytes2read), normOptions.offset);
return bytes2read;
}
}
/**
* Read a numeric token from the stream
* @param token - Numeric token
* @returns Promise with number
*/
}, {
key: "readNumber",
value: async function readNumber(token) {
var len = await this.readBuffer(this.numBuffer, {
length: token.len
});
if (len < token.len) throw new EndOfStreamError();
return token.get(this.numBuffer, 0);
}
/**
* Read a numeric token from the stream
* @param token - Numeric token
* @returns Promise with number
*/
}, {
key: "peekNumber",
value: async function peekNumber(token) {
var len = await this.peekBuffer(this.numBuffer, {
length: token.len
});
if (len < token.len) throw new EndOfStreamError();
return token.get(this.numBuffer, 0);
}
}, {
key: "close",
value: async function close() {
// empty
}
/**
* Ignore number of bytes, advances the pointer in under tokenizer-stream.
* @param length - Number of bytes to ignore
* @return resolves the number of bytes ignored, equals length if this available, otherwise the number of bytes available
*/
}, {
key: "ignore",
value: async function ignore(length) {
if (this.fileInfo.size !== undefined) {
var bytesLeft = this.fileInfo.size - this.position;
if (length > bytesLeft) {
this.position += bytesLeft;
return bytesLeft;
}
}
this.position += length;
return length;
}
}, {
key: "normalizeOptions",
value: function normalizeOptions(uint8Array, options) {
if (options && options.position !== undefined && options.position < this.position) {
throw new Error('`options.position` must be equal or greater than `tokenizer.position`');
}
if (options) {
return {
mayBeLess: options.mayBeLess === true,
offset: options.offset ? options.offset : 0,
length: options.length ? options.length : uint8Array.length - (options.offset ? options.offset : 0),
position: options.position ? options.position : this.position
};
}
return {
mayBeLess: false,
offset: 0,
length: uint8Array.length,
position: this.position
};
}
}]);
return BufferTokenizer;
}();
var FileTypeParser = /*#__PURE__*/function () {
function FileTypeParser() {
_classCallCheck(this, FileTypeParser);
}
_createClass(FileTypeParser, [{
key: "_check",
value: function _check(buffer, headers, options) {
options = {
offset: 0,
...options
};
var _iterator = _createForOfIteratorHelper(headers.entries()),
_step;
try {
for (_iterator.s(); !(_step = _iterator.n()).done;) {
var _step$value = _slicedToArray(_step.value, 2),
index = _step$value[0],
header = _step$value[1];
// If a bitmask is set
if (options.mask) {
// If header doesn't equal `buf` with bits masked off
if (header !== (options.mask[index] & buffer[index + options.offset])) {
return false;
}
} else if (header !== buffer[index + options.offset]) {
return false;
}
}
} catch (err) {
_iterator.e(err);
} finally {
_iterator.f();
}
return true;
}
}, {
key: "check",
value: function check(header, options) {
return this._check(this.buffer, header, options);
}
}, {
key: "stringToBytes",
value: function stringToBytes(string) {
return _toConsumableArray(string).map(function (character) {
return character.charCodeAt(0);
});
}
}, {
key: "checkString",
value: function checkString(header, options) {
return this.check(this.stringToBytes(header), options);
}
}, {
key: "parse",
value: async function parse(input) {
if (!(_instanceof(input, Uint8Array) || _instanceof(input, ArrayBuffer) || _instanceof(input, BufferTokenizer))) {
throw new TypeError("Expected the `input` argument to be of type `Uint8Array` or `Buffer` or `ArrayBuffer`, got `".concat(_typeof(input), "`"));
}
var tokenizer = input;
if (!_instanceof(tokenizer, BufferTokenizer)) {
var buffer = _instanceof(input, Uint8Array) ? input : new Uint8Array(input);
if (!(buffer && buffer.length > 1)) {
return;
}
tokenizer = new BufferTokenizer(buffer);
}
try {
return this.parseTokenizer(tokenizer);
} catch (error) {
if (!_instanceof(error, EndOfStreamError)) {
throw error;
}
}
}
}, {
key: "parseTokenizer",
value: async function parseTokenizer(tokenizer) {
var Token = KrajeeFileTypeConfig.Token;
this.buffer = Buffer.alloc(KrajeeFileTypeConfig.minimumBytes);
// Keep reading until EOF if the file size is unknown.
if (tokenizer.fileInfo.size === undefined) {
tokenizer.fileInfo.size = Number.MAX_SAFE_INTEGER;
}
this.tokenizer = tokenizer;
await tokenizer.peekBuffer(this.buffer, {
length: 12,
mayBeLess: true
});
// -- 2-byte signatures --
if (this.check([0x42, 0x4D])) {
return {
ext: 'bmp',
mime: 'image/bmp'
};
}
if (this.check([0x0B, 0x77])) {
return {
ext: 'ac3',
mime: 'audio/vnd.dolby.dd-raw'
};
}
if (this.check([0x78, 0x01])) {
return {
ext: 'dmg',
mime: 'application/x-apple-diskimage'
};
}
if (this.check([0x4D, 0x5A])) {
return {
ext: 'exe',
mime: 'application/x-msdownload'
};
}
if (this.check([0x25, 0x21])) {
await tokenizer.peekBuffer(this.buffer, {
length: 24,
mayBeLess: true
});
if (this.checkString('PS-Adobe-', {
offset: 2
}) && this.checkString(' EPSF-', {
offset: 14
})) {
return {
ext: 'eps',
mime: 'application/eps'
};
}
return {
ext: 'ps',
mime: 'application/postscript'
};
}
if (this.check([0x1F, 0xA0]) || this.check([0x1F, 0x9D])) {
return {
ext: 'Z',
mime: 'application/x-compress'
};
}
// -- 3-byte signatures --
if (this.check([0x47, 0x49, 0x46])) {
return {
ext: 'gif',
mime: 'image/gif'
};
}
if (this.check([0xFF, 0xD8, 0xFF])) {
return {
ext: 'jpg',
mime: 'image/jpeg'
};
}
if (this.check([0x49, 0x49, 0xBC])) {
return {
ext: 'jxr',
mime: 'image/vnd.ms-photo'
};
}
if (this.check([0x1F, 0x8B, 0x8])) {
return {
ext: 'gz',
mime: 'application/gzip'
};
}
if (this.check([0x42, 0x5A, 0x68])) {
return {
ext: 'bz2',
mime: 'application/x-bzip2'
};
}
if (this.checkString('ID3')) {
await tokenizer.ignore(6); // Skip ID3 header until the header size
var id3HeaderLength = await tokenizer.readToken(KrajeeFileTypeConfig.uint32SyncSafeToken);
if (tokenizer.position + id3HeaderLength > tokenizer.fileInfo.size) {
// Guess file type based on ID3 header for backward compatibility
return {
ext: 'mp3',
mime: 'audio/mpeg'
};
}
await tokenizer.ignore(id3HeaderLength);
return fileTypeFromTokenizer(tokenizer); // Skip ID3 header, recursion
}
// Musepack, SV7
if (this.checkString('MP+')) {
return {
ext: 'mpc',
mime: 'audio/x-musepack'
};
}
if ((this.buffer[0] === 0x43 || this.buffer[0] === 0x46) && this.check([0x57, 0x53], {
offset: 1
})) {
return {
ext: 'swf',
mime: 'application/x-shockwave-flash'
};
}
// -- 4-byte signatures --
if (this.checkString('FLIF')) {
return {
ext: 'flif',
mime: 'image/flif'
};
}
if (this.checkString('8BPS')) {
return {
ext: 'psd',
mime: 'image/vnd.adobe.photoshop'
};
}
if (this.checkString('WEBP', {
offset: 8
})) {
return {
ext: 'webp',
mime: 'image/webp'
};
}
// Musepack, SV8
if (this.checkString('MPCK')) {
return {
ext: 'mpc',
mime: 'audio/x-musepack'
};
}
if (this.checkString('FORM')) {
return {
ext: 'aif',
mime: 'audio/aiff'
};
}
if (this.checkString('icns', {
offset: 0
})) {
return {
ext: 'icns',
mime: 'image/icns'
};
}
// Zip-based file formats
// Need to be before the `zip` check
if (this.check([0x50, 0x4B, 0x3, 0x4])) {
// Local file header signature
try {
while (tokenizer.position + 30 < tokenizer.fileInfo.size) {
await tokenizer.readBuffer(this.buffer, {
length: 30
});
// https://en.wikipedia.org/wiki/Zip_(file_format)#File_headers
var zipHeader = {
compressedSize: this.buffer.readUInt32LE(18),
uncompressedSize: this.buffer.readUInt32LE(22),
filenameLength: this.buffer.readUInt16LE(26),
extraFieldLength: this.buffer.readUInt16LE(28)
};
zipHeader.filename = await tokenizer.readToken(new StringType(zipHeader.filenameLength, 'utf-8'));
await tokenizer.ignore(zipHeader.extraFieldLength);
// Assumes signed `.xpi` from addons.mozilla.org
if (zipHeader.filename === 'META-INF/mozilla.rsa') {
return {
ext: 'xpi',
mime: 'application/x-xpinstall'
};
}
if (zipHeader.filename.endsWith('.rels') || zipHeader.filename.endsWith('.xml')) {
var type = zipHeader.filename.split('/')[0];
switch (type) {
case '_rels':
break;
case 'word':
return {
ext: 'docx',
mime: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
};
case 'ppt':
return {
ext: 'pptx',
mime: 'application/vnd.openxmlformats-officedocument.presentationml.presentation'
};
case 'xl':
return {
ext: 'xlsx',
mime: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
};
default:
break;
}
}
if (zipHeader.filename.startsWith('xl/')) {
return {
ext: 'xlsx',
mime: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
};
}
if (zipHeader.filename.startsWith('3D/') && zipHeader.filename.endsWith('.model')) {
return {
ext: '3mf',
mime: 'model/3mf'
};
}
// The docx, xlsx and pptx file types extend the Office Open XML file format:
// https://en.wikipedia.org/wiki/Office_Open_XML_file_formats
// We look for:
// - one entry named '[Content_Types].xml' or '_rels/.rels',
// - one entry indicating specific type of file.
// MS Office, OpenOffice and LibreOffice may put the parts in different order, so the check should not rely on it.
if (zipHeader.filename === 'mimetype' && zipHeader.compressedSize === zipHeader.uncompressedSize) {
var mimeType = (await tokenizer.readToken(new StringType(zipHeader.compressedSize, 'utf-8'))).trim();
switch (mimeType) {
case 'application/epub+zip':
return {
ext: 'epub',
mime: 'application/epub+zip'
};
case 'application/vnd.oasis.opendocument.text':
return {
ext: 'odt',
mime: 'application/vnd.oasis.opendocument.text'
};
case 'application/vnd.oasis.opendocument.spreadsheet':
return {
ext: 'ods',
mime: 'application/vnd.oasis.opendocument.spreadsheet'
};
case 'application/vnd.oasis.opendocument.presentation':
return {
ext: 'odp',
mime: 'application/vnd.oasis.opendocument.presentation'
};
default:
}
}
// Try to find next header manually when current one is corrupted
if (zipHeader.compressedSize === 0) {
var nextHeaderIndex = -1;
while (nextHeaderIndex < 0 && tokenizer.position < tokenizer.fileInfo.size) {
await tokenizer.peekBuffer(this.buffer, {
mayBeLess: true
});
nextHeaderIndex = this.buffer.indexOf('504B0304', 0, 'hex');
// Move position to the next header if found, skip the whole buffer otherwise
await tokenizer.ignore(nextHeaderIndex >= 0 ? nextHeaderIndex : this.buffer.length);
}
} else {
await tokenizer.ignore(zipHeader.compressedSize);
}
}
} catch (error) {
if (!_instanceof(error, EndOfStreamError)) {
throw error;
}
}
return {
ext: 'zip',
mime: 'application/zip'
};
}
if (this.checkString('OggS')) {
// This is an OGG container
await tokenizer.ignore(28);
var _type = Buffer.alloc(8);
await tokenizer.readBuffer(_type);
// Needs to be before `ogg` check
if (this._check(_type, [0x4F, 0x70, 0x75, 0x73, 0x48, 0x65, 0x61, 0x64])) {
return {
ext: 'opus',
mime: 'audio/opus'
};
}
// If ' theora' in header.
if (this._check(_type, [0x80, 0x74, 0x68, 0x65, 0x6F, 0x72, 0x61])) {
return {
ext: 'ogv',
mime: 'video/ogg'
};
}
// If '\x01video' in header.
if (this._check(_type, [0x01, 0x76, 0x69, 0x64, 0x65, 0x6F, 0x00])) {
return {
ext: 'ogm',
mime: 'video/ogg'
};
}
// If ' FLAC' in header https://xiph.org/flac/faq.html
if (this._check(_type, [0x7F, 0x46, 0x4C, 0x41, 0x43])) {
return {
ext: 'oga',
mime: 'audio/ogg'
};
}
// 'Speex ' in header https://en.wikipedia.org/wiki/Speex
if (this._check(_type, [0x53, 0x70, 0x65, 0x65, 0x78, 0x20, 0x20])) {
return {
ext: 'spx',
mime: 'audio/ogg'
};
}
// If '\x01vorbis' in header
if (this._check(_type, [0x01, 0x76, 0x6F, 0x72, 0x62, 0x69, 0x73])) {
return {
ext: 'ogg',
mime: 'audio/ogg'
};
}
// Default OGG container https://www.iana.org/assignments/media-types/application/ogg
return {
ext: 'ogx',
mime: 'application/ogg'
};
}
if (this.check([0x50, 0x4B]) && (this.buffer[2] === 0x3 || this.buffer[2] === 0x5 || this.buffer[2] === 0x7) && (this.buffer[3] === 0x4 || this.buffer[3] === 0x6 || this.buffer[3] === 0x8)) {
return {
ext: 'zip',
mime: 'application/zip'
};
}
//
// File Type Box (https://en.wikipedia.org/wiki/ISO_base_media_file_format)
// It's not required to be first, but it's recommended to be. Almost all ISO base media files start with `ftyp` box.
// `ftyp` box must contain a brand major identifier, which must consist of ISO 8859-1 printable characters.
// Here we check for 8859-1 printable characters (for simplicity, it's a mask which also catches one non-printable character).
if (this.checkString('ftyp', {
offset: 4
}) && (this.buffer[8] & 0x60) !== 0x00 // Brand major, first character ASCII?
) {
// They all can have MIME `video/mp4` except `application/mp4` special-case which is hard to detect.
// For some cases, we're specific, everything else falls to `video/mp4` with `mp4` extension.
var brandMajor = this.buffer.toString('binary', 8, 12).replace('\0', ' ').trim();
switch (brandMajor) {
case 'avif':
case 'avis':
return {
ext: 'avif',
mime: 'image/avif'
};
case 'mif1':
return {
ext: 'heic',
mime: 'image/heif'
};
case 'msf1':
return {
ext: 'heic',
mime: 'image/heif-sequence'
};
case 'heic':
case 'heix':
return {
ext: 'heic',
mime: 'image/heic'
};
case 'hevc':
case 'hevx':
return {
ext: 'heic',
mime: 'image/heic-sequence'
};
case 'qt':
return {
ext: 'mov',
mime: 'video/quicktime'
};
case 'M4V':
case 'M4VH':
case 'M4VP':
return {
ext: 'm4v',
mime: 'video/x-m4v'
};
case 'M4P':
return {
ext: 'm4p',
mime: 'video/mp4'
};
case 'M4B':
return {
ext: 'm4b',
mime: 'audio/mp4'
};
case 'M4A':
return {
ext: 'm4a',
mime: 'audio/x-m4a'
};
case 'F4V':
return {
ext: 'f4v',
mime: 'video/mp4'
};
case 'F4P':
return {
ext: 'f4p',
mime: 'video/mp4'
};
case 'F4A':
return {
ext: 'f4a',
mime: 'audio/mp4'
};
case 'F4B':
return {
ext: 'f4b',
mime: 'audio/mp4'
};
case 'crx':
return {
ext: 'cr3',
mime: 'image/x-canon-cr3'
};
default:
if (brandMajor.startsWith('3g')) {
if (brandMajor.startsWith('3g2')) {
return {
ext: '3g2',
mime: 'video/3gpp2'
};
}
return {
ext: '3gp',
mime: 'video/3gpp'
};
}
return {
ext: 'mp4',
mime: 'video/mp4'
};
}
}
if (this.checkString('MThd')) {
return {
ext: 'mid',
mime: 'audio/midi'
};
}
if (this.checkString('wOFF') && (this.check([0x00, 0x01, 0x00, 0x00], {
offset: 4
}) || this.checkString('OTTO', {
offset: 4
}))) {
return {
ext: 'woff',
mime: 'font/woff'
};
}
if (this.checkString('wOF2') && (this.check([0x00, 0x01, 0x00, 0x00], {
offset: 4
}) || this.checkString('OTTO', {
offset: 4
}))) {
return {
ext: 'woff2',
mime: 'font/woff2'
};
}
if (this.check([0xD4, 0xC3, 0xB2, 0xA1]) || this.check([0xA1, 0xB2, 0xC3, 0xD4])) {
return {
ext: 'pcap',
mime: 'application/vnd.tcpdump.pcap'
};
}
// Sony DSD Stream File (DSF)
if (this.checkString('DSD ')) {
return {
ext: 'dsf',
mime: 'audio/x-dsf' // Non-standard
};
}
if (this.checkString('LZIP')) {
return {
ext: 'lz',
mime: 'application/x-lzip'
};
}
if (this.checkString('fLaC')) {
return {
ext: 'flac',
mime: 'audio/x-flac'
};
}
if (this.check([0x42, 0x50, 0x47, 0xFB])) {
return {
ext: 'bpg',
mime: 'image/bpg'
};
}
if (this.checkString('wvpk')) {
return {
ext: 'wv',
mime: 'audio/wavpack'
};
}
if (this.checkString('%PDF')) {
await tokenizer.ignore(1350);
var maxBufferSize = 10 * 1024 * 1024;
var buffer = Buffer.alloc(Math.min(maxBufferSize, tokenizer.fileInfo.size));
await tokenizer.readBuffer(buffer, {
mayBeLess: true
});
// Check if this is an Adobe Illustrator file
if (buffer.includes(Buffer.from('AIPrivateData'))) {
return {
ext: 'ai',
mime: 'application/postscript'
};
}
// Assume this is just a normal PDF
return {
ext: 'pdf',
mime: 'application/pdf'
};
}
if (this.check([0x00, 0x61, 0x73, 0x6D])) {
return {
ext: 'wasm',
mime: 'application/wasm'
};
}
// TIFF, little-endian type
if (this.check([0x49, 0x49])) {
var fileType = await this.readTiffHeader(false);
if (fileType) {
return fileType;
}
}
// TIFF, big-endian type
if (this.check([0x4D, 0x4D])) {
var _fileType = await this.readTiffHeader(true);
if (_fileType) {
return _fileType;
}
}
if (this.checkString('MAC ')) {
return {
ext: 'ape',
mime: 'audio/ape'
};
}
// https://github.com/threatstack/libmagic/blob/master/magic/Magdir/matroska
if (this.check([0x1A, 0x45, 0xDF, 0xA3])) {
// Root element: EBML
var readField = async function readField() {
var msb = await tokenizer.peekNumber(Token.UINT8);
var mask = 0x80;
var ic = 0; // 0 = A, 1 = B, 2 = C, 3
// = D
while ((msb & mask) === 0) {
++ic;
mask >>= 1;
}
var id = Buffer.alloc(ic + 1);
await tokenizer.readBuffer(id);
return id;
};
var readElement = async function readElement() {
var id = await readField();
var lengthField = await readField();
lengthField[0] ^= 0x80 >> lengthField.length - 1;
var nrLength = Math.min(6, lengthField.length); // JavaScript can max read 6 bytes integer
return {
id: id.readUIntBE(0, id.length),
len: lengthField.readUIntBE(lengthField.length - nrLength, nrLength)
};
};
var readChildren = async function readChildren(level, children) {
while (children > 0) {
var element = await readElement();
if (element.id === 0x42_82) {
var rawValue = await tokenizer.readToken(new StringType(element.len, 'utf-8'));
return rawValue.replace(/\00.*$/g, ''); // Return DocType
}
await tokenizer.ignore(element.len); // ignore payload
--children;
}
};
var re = await readElement();
var docType = await readChildren(1, re.len);
switch (docType) {
case 'webm':
return {
ext: 'webm',
mime: 'video/webm'
};
case 'matroska':
return {
ext: 'mkv',
mime: 'video/x-matroska'
};
default:
return;
}
}
// RIFF file format which might be AVI, WAV, QCP, etc
if (this.check([0x52, 0x49, 0x46, 0x46])) {
if (this.check([0x41, 0x56, 0x49], {
offset: 8
})) {
return {
ext: 'avi',
mime: 'video/vnd.avi'
};
}
if (this.check([0x57, 0x41, 0x56, 0x45], {
offset: 8
})) {
return {
ext: 'wav',
mime: 'audio/vnd.wave'
};
}
// QLCM, QCP file
if (this.check([0x51, 0x4C, 0x43, 0x4D], {
offset: 8
})) {
return {
ext: 'qcp',
mime: 'audio/qcelp'
};
}
}
if (this.checkString('SQLi')) {
return {
ext: 'sqlite',
mime: 'application/x-sqlite3'
};
}
if (this.check([0x4E, 0x45, 0x53, 0x1A])) {
return {
ext: 'nes',
mime: 'application/x-nintendo-nes-rom'
};
}
if (this.checkString('Cr24')) {
return {
ext: 'crx',
mime: 'application/x-google-chrome-extension'
};
}
if (this.checkString('MSCF') || this.checkString('ISc(')) {
return {
ext: 'cab',
mime: 'application/vnd.ms-cab-compressed'
};
}
if (this.check([0xED, 0xAB, 0xEE, 0xDB])) {
return {
ext: 'rpm',
mime: 'application/x-rpm'
};
}
if (this.check([0xC5, 0xD0, 0xD3, 0xC6])) {
return {
ext: 'eps',
mime: 'application/eps'
};
}
if (this.check([0x28, 0xB5, 0x2F, 0xFD])) {
return {
ext: 'zst',
mime: 'application/zstd'
};
}
if (this.check([0x7F, 0x45, 0x4C, 0x46])) {
return {
ext: 'elf',
mime: 'application/x-elf'
};
}
// -- 5-byte signatures --
if (this.check([0x4F, 0x54, 0x54, 0x4F, 0x00])) {
return {
ext: 'otf',
mime: 'font/otf'
};
}
if (this.checkString('#!AMR')) {
return {
ext: 'amr',
mime: 'audio/amr'
};
}
if (this.checkString('{\\rtf')) {
return {
ext: 'rtf',
mime: 'application/rtf'
};
}
if (this.check([0x46, 0x4C, 0x56, 0x01])) {
return {
ext: 'flv',
mime: 'video/x-flv'
};
}
if (this.checkString('IMPM')) {
return {
ext: 'it',
mime: 'audio/x-it'
};
}
if (this.checkString('-lh0-', {
offset: 2
}) || this.checkString('-lh1-', {
offset: 2
}) || this.checkString('-lh2-', {
offset: 2
}) || this.checkString('-lh3-', {
offset: 2
}) || this.checkString('-lh4-', {
offset: 2
}) || this.checkString('-lh5-', {
offset: 2
}) || this.checkString('-lh6-', {
offset: 2
}) || this.checkString('-lh7-', {
offset: 2
}) || this.checkString('-lzs-', {
offset: 2
}) || this.checkString('-lz4-', {
offset: 2
}) || this.checkString('-lz5-', {
offset: 2
}) || this.checkString('-lhd-', {
offset: 2
})) {
return {
ext: 'lzh',
mime: 'application/x-lzh-compressed'
};
}
// MPEG program stream (PS or MPEG-PS)
if (this.check([0x00, 0x00, 0x01, 0xBA])) {
// MPEG-PS, MPEG-1 Part 1
if (this.check([0x21], {
offset: 4,
mask: [0xF1]
})) {
return {
ext: 'mpg',
// May also be .ps, .mpeg
mime: 'video/MP1S'
};
}
// MPEG-PS, MPEG-2 Part 1
if (this.check([0x44], {
offset: 4,
mask: [0xC4]
})) {
return {
ext: 'mpg',
// May also be .mpg, .m2p, .vob or .sub
mime: 'video/MP2P'
};
}
}
if (this.checkString('ITSF')) {
return {
ext: 'chm',
mime: 'application/vnd.ms-htmlhelp'
};
}
// -- 6-byte signatures --
if (this.check([0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00])) {
return {
ext: 'xz',
mime: 'application/x-xz'
};
}
if (this.checkString('<?xml ')) {
return {
ext: 'xml',
mime: 'application/xml'
};
}
if (this.check([0x37, 0x7A, 0xBC, 0xAF, 0x27, 0x1C])) {
return {
ext: '7z',
mime: 'application/x-7z-compressed'
};
}
if (this.check([0x52, 0x61, 0x72, 0x21, 0x1A, 0x7]) && (this.buffer[6] === 0x0 || this.buffer[6] === 0x1)) {
return {
ext: 'rar',
mime: 'application/x-rar-compressed'
};
}
if (this.checkString('solid ')) {
return {
ext: 'stl',
mime: 'model/stl'
};
}
// -- 7-byte signatures --
if (this.checkString('BLENDER')) {
return {
ext: 'blend',
mime: 'application/x-blender'
};
}
if (this.checkString('!<arch>')) {
await tokenizer.ignore(8);
var string = await tokenizer.readToken(new StringType(13, 'ascii'));
if (string === 'debian-binary') {
return {
ext: 'deb',
mime: 'application/x-deb'
};
}
return {
ext: 'ar',
mime: 'application/x-unix-archive'
};
}
// -- 8-byte signatures --
if (this.check([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A])) {
// ignore PNG signature
var readChunkHeader = async function readChunkHeader() {
return {
length: await tokenizer.readToken(Token.INT32_BE),
type: await tokenizer.readToken(new StringType(4, 'binary'))
};
};
// APNG format (https://wiki.mozilla.org/APNG_Specification)
// 1. Find the first IDAT (image data) chunk (49 44 41 54)
// 2. Check if there is an "acTL" chunk before the IDAT one (61 63 54 4C)
// Offset calculated as follows:
// - 8 bytes: PNG signature
// - 4 (length) + 4 (chunk type) + 13 (chunk data) + 4 (CRC): IHDR chunk
await tokenizer.ignore(8);
do {
var chunk = await readChunkHeader();
if (chunk.length < 0) {
return; // Invalid chunk length
}
switch (chunk.type) {
case 'IDAT':
return {
ext: 'png',
mime: 'image/png'
};
case 'acTL':
return {
ext: 'apng',
mime: 'image/apng'
};
default:
await tokenizer.ignore(chunk.length + 4);
// Ignore chunk-data + CRC
}
} while (tokenizer.position + 8 < tokenizer.fileInfo.size);
return {
ext: 'png',
mime: 'image/png'
};
}
if (this.check([0x41, 0x52, 0x52, 0x4F, 0x57, 0x31, 0x00, 0x00])) {
return {
ext: 'arrow',
mime: 'application/x-apache-arrow'
};
}
if (this.check([0x67, 0x6C, 0x54, 0x46, 0x02, 0x00, 0x00, 0x00])) {
return {
ext: 'glb',
mime: 'model/gltf-binary'
};
}
// `mov` format variants
if (this.check([0x66, 0x72, 0x65, 0x65], {
offset: 4
}) // `free`
|| this.check([0x6D, 0x64, 0x61, 0x74], {
offset: 4
}) // `mdat` MJPEG
|| this.check([0x6D, 0x6F, 0x6F, 0x76], {
offset: 4
}) // `moov`
|| this.check([0x77, 0x69, 0x64, 0x65], {
offset: 4
}) // `wide`
) {
return {
ext: 'mov',
mime: 'video/quicktime'
};
}
if (this.check([0xEF, 0xBB, 0xBF]) && this.checkString('<?xml', {
offset: 3
})) {
// UTF-8-BOM
return {
ext: 'xml',
mime: 'application/xml'
};
}
// -- 9-byte signatures --
if (this.check([0x49, 0x49, 0x52, 0x4F, 0x08, 0x00, 0x00, 0x00, 0x18])) {
return {
ext: 'orf',
mime: 'image/x-olympus-orf'
};
}
if (this.checkString('gimp xcf ')) {
return {
ext: 'xcf',
mime: 'image/x-xcf'
};
}
// -- 12-byte signatures --
if (this.check([0x49, 0x49, 0x55, 0x00, 0x18, 0x00, 0x00, 0x00, 0x88, 0xE7, 0x74, 0xD8])) {
return {
ext: 'rw2',
mime: 'image/x-panasonic-rw2'
};
}
// ASF_Header_Object first 80 bytes
if (this.check([0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11, 0xA6, 0xD9])) {
var readHeader = async function readHeader() {
var guid = Buffer.alloc(16);
await tokenizer.readBuffer(guid);
return {
id: guid,
size: Number(await tokenizer.readToken(Token.UINT64_LE))
};
};
await tokenizer.ignore(30);
// Search for header should be in first 1KB of file.
while (tokenizer.position + 24 < tokenizer.fileInfo.size) {
var header = await readHeader();
var payload = header.size - 24;
if (this._check(header.id, [0x91, 0x07, 0xDC, 0xB7, 0xB7, 0xA9, 0xCF, 0x11, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65])) {
// Sync on Stream-Properties-Object (B7DC0791-A9B7-11CF-8EE6-00C00C205365)
var typeId = Buffer.alloc(16);
payload -= await tokenizer.readBuffer(typeId);
if (this._check(typeId, [0x40, 0x9E, 0x69, 0xF8, 0x4D, 0x5B, 0xCF, 0x11, 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B])) {
// Found audio:
return {
ext: 'asf',
mime: 'audio/x-ms-asf'
};
}
if (this._check(typeId, [0xC0, 0xEF, 0x19, 0xBC, 0x4D, 0x5B, 0xCF, 0x11, 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B])) {
// Found video:
return {
ext: 'asf',
mime: 'video/x-ms-asf'
};
}
break;
}
await tokenizer.ignore(payload);
}
// Default to ASF generic extension
return {
ext: 'asf',
mime: 'application/vnd.ms-asf'
};
}
if (this.check([0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A])) {
return {
ext: 'ktx',
mime: 'image/ktx'
};
}
if ((this.check([0x7E, 0x10, 0x04]) || this.check([0x7E, 0x18, 0x04])) && this.check([0x30, 0x4D, 0x49, 0x45], {
offset: 4
})) {
return {
ext: 'mie',
mime: 'application/x-mie'
};
}
if (this.check([0x27, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], {
offset: 2
})) {
return {
ext: 'shp',
mime: 'application/x-esri-shape'
};
}
if (this.check([0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A])) {
// JPEG-2000 family
await tokenizer.ignore(20);
var _type2 = await tokenizer.readToken(new StringType(4, 'ascii'));
switch (_type2) {
case 'jp2 ':
return {
ext: 'jp2',
mime: 'image/jp2'
};
case 'jpx ':
return {
ext: 'jpx',
mime: 'image/jpx'
};
case 'jpm ':
return {
ext: 'jpm',
mime: 'image/jpm'
};
case 'mjp2':
return {
ext: 'mj2',
mime: 'image/mj2'
};
default:
return;
}
}
if (this.check([0xFF, 0x0A]) || this.check([0x00, 0x00, 0x00, 0x0C, 0x4A, 0x58, 0x4C, 0x20, 0x0D, 0x0A, 0x87, 0x0A])) {
return {
ext: 'jxl',
mime: 'image/jxl'
};
}
if (this.check([0xFE, 0xFF, 0, 60, 0, 63, 0, 120, 0, 109, 0, 108]) // UTF-16-BOM-LE
|| this.check([0xFF, 0xFE, 60, 0, 63, 0, 120, 0, 109, 0, 108, 0]) // UTF-16-BOM-LE
) {
return {
ext: 'xml',
mime: 'application/xml'
};
}
// -- Unsafe signatures --
if (this.check([0x0, 0x0, 0x1, 0xBA]) || this.check([0x0, 0x0, 0x1, 0xB3])) {
return {
ext: 'mpg',
mime: 'video/mpeg'
};
}
if (this.check([0x00, 0x01, 0x00, 0x00, 0x00])) {
return {
ext: 'ttf',
mime: 'font/ttf'
};
}
if (this.check([0x00, 0x00, 0x01, 0x00])) {
return {
ext: 'ico',
mime: 'image/x-icon'
};
}
if (this.check([0x00, 0x00, 0x02, 0x00])) {
return {
ext: 'cur',
mime: 'image/x-icon'
};
}
if (this.check([0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1])) {
// Detected Microsoft Compound File Binary File (MS-CFB) Format.
return {
ext: 'cfb',
mime: 'application/x-cfb'
};
}
// Increase sample size from 12 to 256.
await tokenizer.peekBuffer(this.buffer, {
length: Math.min(256, tokenizer.fileInfo.size),
mayBeLess: true
});
// -- 15-byte signatures --
if (this.checkString('BEGIN:')) {
if (this.checkString('VCARD', {
offset: 6
})) {
return {
ext: 'vcf',
mime: 'text/vcard'
};
}
if (this.checkString('VCALENDAR', {
offset: 6
})) {
return {
ext: 'ics',
mime: 'text/calendar'
};
}
}
// `raf` is here just to keep all the raw image detectors together.
if (this.checkString('FUJIFILMCCD-RAW')) {
return {
ext: 'raf',
mime: 'image/x-fujifilm-raf'
};
}
if (this.checkString('Extended Module:')) {
return {
ext: 'xm',
mime: 'audio/x-xm'
};
}
if (this.checkString('Creative Voice File')) {
return {
ext: 'voc',
mime: 'audio/x-voc'
};
}
if (this.check([0x04, 0x00, 0x00, 0x00]) && this.buffer.length >= 16) {
// Rough & quick check Pickle/ASAR
var jsonSize = this.buffer.readUInt32LE(12);
if (jsonSize > 12 && this.buffer.length >= jsonSize + 16) {
try {
var _header = this.buffer.slice(16, jsonSize + 16).toString();
var json = JSON.parse(_header);
// Check if Pickle is ASAR
if (json.files) {
// Final check, assuring Pickle/ASAR format
return {
ext: 'asar',
mime: 'application/x-asar'
};
}
} catch (err) {
console.log(err);
}
}
}
if (this.check([0x06, 0x0E, 0x2B, 0x34, 0x02, 0x05, 0x01, 0x01, 0x0D, 0x01, 0x02, 0x01, 0x01, 0x02])) {
return {
ext: 'mxf',
mime: 'application/mxf'
};
}
if (this.checkString('SCRM', {
offset: 44
})) {
return {
ext: 's3m',
mime: 'audio/x-s3m'
};
}
// Raw MPEG-2 transport stream (188-byte packets)
if (this.check([0x47]) && this.check([0x47], {
offset: 188
})) {
return {
ext: 'mts',
mime: 'video/mp2t'
};
}
// Blu-ray Disc Audio-Video (BDAV) MPEG-2 transport stream has 4-byte TP_extra_header before each 188-byte packet
if (this.check([0x47], {
offset: 4
}) && this.check([0x47], {
offset: 196
})) {
return {
ext: 'mts',
mime: 'video/mp2t'
};
}
if (this.check([0x42, 0x4F, 0x4F, 0x4B, 0x4D, 0x4F, 0x42, 0x49], {
offset: 60
})) {
return {
ext: 'mobi',
mime: 'application/x-mobipocket-ebook'
};
}
if (this.check([0x44, 0x49, 0x43, 0x4D], {
offset: 128
})) {
return {
ext: 'dcm',
mime: 'application/dicom'
};
}
if (this.check([0x4C, 0x00, 0x00, 0x00, 0x01, 0x14, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46])) {
return {
ext: 'lnk',
mime: 'application/x.ms.shortcut' // Invented by us
};
}
if (this.check([0x62, 0x6F, 0x6F, 0x6B, 0x00, 0x00, 0x00, 0x00, 0x6D, 0x61, 0x72, 0x6B, 0x00, 0x00, 0x00, 0x00])) {
return {
ext: 'alias',
mime: 'application/x.apple.alias' // Invented by us
};
}
if (this.check([0x4C, 0x50], {
offset: 34
}) && (this.check([0x00, 0x00, 0x01], {
offset: 8
}) || this.check([0x01, 0x00, 0x02], {
offset: 8
}) || this.check([0x02, 0x00, 0x02], {
offset: 8
}))) {
return {
ext: 'eot',
mime: 'application/vnd.ms-fontobject'
};
}
if (this.check([0x06, 0x06, 0xED, 0xF5, 0xD8, 0x1D, 0x46, 0xE5, 0xBD, 0x31, 0xEF, 0xE7, 0xFE, 0x74, 0xB7, 0x1D])) {
return {
ext: 'indd',
mime: 'application/x-indesign'
};
}
// Increase sample size from 256 to 512
await tokenizer.peekBuffer(this.buffer, {
length: Math.min(512, tokenizer.fileInfo.size),
mayBeLess: true
});
// Requires a buffer size of 512 bytes
if (KrajeeFileTypeConfig.tarHeaderChecksumMatches(this.buffer)) {
return {
ext: 'tar',
mime: 'application/x-tar'
};
}
if (this.check([0xFF, 0xFE, 0xFF, 0x0E, 0x53, 0x00, 0x6B, 0x00, 0x65, 0x00, 0x74, 0x00, 0x63, 0x00, 0x68, 0x00, 0x55, 0x00, 0x70, 0x00, 0x20, 0x00, 0x4D, 0x00, 0x6F, 0x00, 0x64, 0x00, 0x65, 0x00, 0x6C, 0x00])) {
return {
ext: 'skp',
mime: 'application/vnd.sketchup.skp'
};
}
if (this.checkString('-----BEGIN PGP MESSAGE-----')) {
return {
ext: 'pgp',
mime: 'application/pgp-encrypted'
};
}
// Check MPEG 1 or 2 Layer 3 header, or 'layer 0' for ADTS (MPEG sync-word 0xFFE)
if (this.buffer.length >= 2 && this.check([0xFF, 0xE0], {
offset: 0,
mask: [0xFF, 0xE0]
})) {
if (this.check([0x10], {
offset: 1,
mask: [0x16]
})) {
// Check for (ADTS) MPEG-2
if (this.check([0x08], {
offset: 1,
mask: [0x08]
})) {
return {
ext: 'aac',
mime: 'audio/aac'
};
}
// Must be (ADTS) MPEG-4
return {
ext: 'aac',
mime: 'audio/aac'
};
}
// MPEG 1 or 2 Layer 3 header
// Check for MPEG layer 3
if (this.check([0x02], {
offset: 1,
mask: [0x06]
})) {
return {
ext: 'mp3',
mime: 'audio/mpeg'
};
}
// Check for MPEG layer 2
if (this.check([0x04], {
offset: 1,
mask: [0x06]
})) {
return {
ext: 'mp2',
mime: 'audio/mpeg'
};
}
// Check for MPEG layer 1
if (this.check([0x06], {
offset: 1,
mask: [0x06]
})) {
return {
ext: 'mp1',
mime: 'audio/mpeg'
};
}
}
return {};
}
}, {
key: "readTiffTag",
value: async function readTiffTag(bigEndian) {
var Token = KrajeeFileTypeConfig.Token;
var tagId = null;
try {
tagId = await this.tokenizer.readToken(bigEndian ? Token.UINT16_BE : Token.UINT16_LE);
} catch (error) {
if (_instanceof(error, EndOfStreamError)) {
return null;
}
throw error;
}
this.tokenizer.ignore(10);
switch (tagId) {
case 50_341:
return {
ext: 'arw',
mime: 'image/x-sony-arw'
};
case 50_706:
return {
ext: 'dng',
mime: 'image/x-adobe-dng'
};
default:
return null;
}
}
}, {
key: "readTiffIFD",
value: async function readTiffIFD(bigEndian) {
var Token = KrajeeFileTypeConfig.Token;
var numberOfTags = await this.tokenizer.readToken(bigEndian ? Token.UINT16_BE : Token.UINT16_LE);
for (var n = 0; n < numberOfTags; ++n) {
var fileType = await this.readTiffTag(bigEndian);
if (fileType) {
return fileType;
}
}
return null;
}
}, {
key: "readTiffHeader",
value: async function readTiffHeader(bigEndian) {
var Token = KrajeeFileTypeConfig.Token;
var version = (bigEndian ? Token.UINT16_BE : Token.UINT16_LE).get(this.buffer, 2);
var ifdOffset = (bigEndian ? Token.UINT32_BE : Token.UINT32_LE).get(this.buffer, 4);
var tiff = {
ext: 'tif',
mime: 'image/tiff'
};
if (version === 42) {
// TIFF file header
if (ifdOffset >= 6) {
if (this.checkString('CR', {
offset: 8
})) {
return {
ext: 'cr2',
mime: 'image/x-canon-cr2'
};
}
if (ifdOffset >= 8 && (this.check([0x1C, 0x00, 0xFE, 0x00], {
offset: 8
}) || this.check([0x1F, 0x00, 0x0B, 0x00], {
offset: 8
}))) {
return {
ext: 'nef',
mime: 'image/x-nikon-nef'
};
}
}
await this.tokenizer.ignore(ifdOffset);
var fileType = await this.readTiffIFD(false);
return fileType ? fileType : tiff;
}
if (version === 43) {
// Big TIFF file header
return tiff;
}
}
}]);
return FileTypeParser;
}();
Kontol Shell Bypass