@fnlb-project/stanza
Version:
Modern XMPP in the browser, with a JSON API
1,418 lines • 66.4 kB
JavaScript
/*!
* The buffer module from node.js, for the browser.
*
* @author Feross Aboukhadijeh <https://feross.org>
* @license MIT
*/
/* eslint-disable no-proto */
'use strict';
const base64 = require('./base64-js');
const ieee754 = require('./ieee754');
const customInspectSymbol = typeof Symbol === 'function' && typeof Symbol['for'] === 'function' // eslint-disable-line dot-notation
? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation
: null;
exports.Buffer = Buffer;
exports.SlowBuffer = SlowBuffer;
exports.INSPECT_MAX_BYTES = 50;
const K_MAX_LENGTH = 0x7fffffff;
exports.kMaxLength = K_MAX_LENGTH;
/**
* If `Buffer.TYPED_ARRAY_SUPPORT`:
* === true Use Uint8Array implementation (fastest)
* === false Print warning and recommend using `buffer` v4.x which has an Object
* implementation (most compatible, even IE6)
*
* Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
* Opera 11.6+, iOS 4.2+.
*
* We report that the browser does not support typed arrays if the are not subclassable
* using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
* (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
* for __proto__ and has a buggy typed array implementation.
*/
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport();
if (!Buffer.TYPED_ARRAY_SUPPORT &&
typeof console !== 'undefined' &&
typeof console.error === 'function') {
console.error('This browser lacks typed array (Uint8Array) support which is required by ' +
'`buffer` v5.x. Use `buffer` v4.x if you require old browser support.');
}
function typedArraySupport() {
// Can typed array instances can be augmented?
try {
const arr = new Uint8Array(1);
const proto = {
foo: function () {
return 42;
}
};
Object.setPrototypeOf(proto, Uint8Array.prototype);
Object.setPrototypeOf(arr, proto);
return arr.foo() === 42;
}
catch (e) {
return false;
}
}
Object.defineProperty(Buffer.prototype, 'parent', {
enumerable: true,
get: function () {
if (!Buffer.isBuffer(this))
return undefined;
return this.buffer;
}
});
Object.defineProperty(Buffer.prototype, 'offset', {
enumerable: true,
get: function () {
if (!Buffer.isBuffer(this))
return undefined;
return this.byteOffset;
}
});
function createBuffer(length) {
if (length > K_MAX_LENGTH) {
throw new RangeError('The value "' + length + '" is invalid for option "size"');
}
// Return an augmented `Uint8Array` instance
const buf = new Uint8Array(length);
Object.setPrototypeOf(buf, Buffer.prototype);
return buf;
}
/**
* The Buffer constructor returns instances of `Uint8Array` that have their
* prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
* `Uint8Array`, so the returned instances will have all the node `Buffer` methods
* and the `Uint8Array` methods. Square bracket notation works as expected -- it
* returns a single octet.
*
* The `Uint8Array` prototype remains unmodified.
*/
function Buffer(arg, encodingOrOffset, length) {
// Common case.
if (typeof arg === 'number') {
if (typeof encodingOrOffset === 'string') {
throw new TypeError('The "string" argument must be of type string. Received type number');
}
return allocUnsafe(arg);
}
return from(arg, encodingOrOffset, length);
}
Buffer.poolSize = 8192; // not used by this implementation
function from(value, encodingOrOffset, length) {
if (typeof value === 'string') {
return fromString(value, encodingOrOffset);
}
if (ArrayBuffer.isView(value)) {
return fromArrayView(value);
}
if (value == null) {
throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
'or Array-like Object. Received type ' +
typeof value);
}
if (isInstance(value, ArrayBuffer) || (value && isInstance(value.buffer, ArrayBuffer))) {
return fromArrayBuffer(value, encodingOrOffset, length);
}
if (typeof SharedArrayBuffer !== 'undefined' &&
(isInstance(value, SharedArrayBuffer) ||
(value && isInstance(value.buffer, SharedArrayBuffer)))) {
return fromArrayBuffer(value, encodingOrOffset, length);
}
if (typeof value === 'number') {
throw new TypeError('The "value" argument must not be of type number. Received type number');
}
const valueOf = value.valueOf && value.valueOf();
if (valueOf != null && valueOf !== value) {
return Buffer.from(valueOf, encodingOrOffset, length);
}
const b = fromObject(value);
if (b)
return b;
if (typeof Symbol !== 'undefined' &&
Symbol.toPrimitive != null &&
typeof value[Symbol.toPrimitive] === 'function') {
return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length);
}
throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
'or Array-like Object. Received type ' +
typeof value);
}
/**
* Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
* if value is a number.
* Buffer.from(str[, encoding])
* Buffer.from(array)
* Buffer.from(buffer)
* Buffer.from(arrayBuffer[, byteOffset[, length]])
**/
Buffer.from = function (value, encodingOrOffset, length) {
return from(value, encodingOrOffset, length);
};
// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype);
Object.setPrototypeOf(Buffer, Uint8Array);
function assertSize(size) {
if (typeof size !== 'number') {
throw new TypeError('"size" argument must be of type number');
}
else if (size < 0) {
throw new RangeError('The value "' + size + '" is invalid for option "size"');
}
}
function alloc(size, fill, encoding) {
assertSize(size);
if (size <= 0) {
return createBuffer(size);
}
if (fill !== undefined) {
// Only pay attention to encoding if it's a string. This
// prevents accidentally sending in a number that would
// be interpreted as a start offset.
return typeof encoding === 'string'
? createBuffer(size).fill(fill, encoding)
: createBuffer(size).fill(fill);
}
return createBuffer(size);
}
/**
* Creates a new filled Buffer instance.
* alloc(size[, fill[, encoding]])
**/
Buffer.alloc = function (size, fill, encoding) {
return alloc(size, fill, encoding);
};
function allocUnsafe(size) {
assertSize(size);
return createBuffer(size < 0 ? 0 : checked(size) | 0);
}
/**
* Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
* */
Buffer.allocUnsafe = function (size) {
return allocUnsafe(size);
};
/**
* Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
*/
Buffer.allocUnsafeSlow = function (size) {
return allocUnsafe(size);
};
function fromString(string, encoding) {
if (typeof encoding !== 'string' || encoding === '') {
encoding = 'utf8';
}
if (!Buffer.isEncoding(encoding)) {
throw new TypeError('Unknown encoding: ' + encoding);
}
const length = byteLength(string, encoding) | 0;
let buf = createBuffer(length);
const actual = buf.write(string, encoding);
if (actual !== length) {
// Writing a hex string, for example, that contains invalid characters will
// cause everything after the first invalid character to be ignored. (e.g.
// 'abxxcd' will be treated as 'ab')
buf = buf.slice(0, actual);
}
return buf;
}
function fromArrayLike(array) {
const length = array.length < 0 ? 0 : checked(array.length) | 0;
const buf = createBuffer(length);
for (let i = 0; i < length; i += 1) {
buf[i] = array[i] & 255;
}
return buf;
}
function fromArrayView(arrayView) {
if (isInstance(arrayView, Uint8Array)) {
const copy = new Uint8Array(arrayView);
return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength);
}
return fromArrayLike(arrayView);
}
function fromArrayBuffer(array, byteOffset, length) {
if (byteOffset < 0 || array.byteLength < byteOffset) {
throw new RangeError('"offset" is outside of buffer bounds');
}
if (array.byteLength < byteOffset + (length || 0)) {
throw new RangeError('"length" is outside of buffer bounds');
}
let buf;
if (byteOffset === undefined && length === undefined) {
buf = new Uint8Array(array);
}
else if (length === undefined) {
buf = new Uint8Array(array, byteOffset);
}
else {
buf = new Uint8Array(array, byteOffset, length);
}
// Return an augmented `Uint8Array` instance
Object.setPrototypeOf(buf, Buffer.prototype);
return buf;
}
function fromObject(obj) {
if (Buffer.isBuffer(obj)) {
const len = checked(obj.length) | 0;
const buf = createBuffer(len);
if (buf.length === 0) {
return buf;
}
obj.copy(buf, 0, 0, len);
return buf;
}
if (obj.length !== undefined) {
if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
return createBuffer(0);
}
return fromArrayLike(obj);
}
if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
return fromArrayLike(obj.data);
}
}
function checked(length) {
// Note: cannot use `length < K_MAX_LENGTH` here because that fails when
// length is NaN (which is otherwise coerced to zero.)
if (length >= K_MAX_LENGTH) {
throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
'size: 0x' +
K_MAX_LENGTH.toString(16) +
' bytes');
}
return length | 0;
}
function SlowBuffer(length) {
if (+length != length) {
// eslint-disable-line eqeqeq
length = 0;
}
return Buffer.alloc(+length);
}
Buffer.isBuffer = function isBuffer(b) {
return b != null && b._isBuffer === true && b !== Buffer.prototype; // so Buffer.isBuffer(Buffer.prototype) will be false
};
Buffer.compare = function compare(a, b) {
if (isInstance(a, Uint8Array))
a = Buffer.from(a, a.offset, a.byteLength);
if (isInstance(b, Uint8Array))
b = Buffer.from(b, b.offset, b.byteLength);
if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
throw new TypeError('The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array');
}
if (a === b)
return 0;
let x = a.length;
let y = b.length;
for (let i = 0, len = Math.min(x, y); i < len; ++i) {
if (a[i] !== b[i]) {
x = a[i];
y = b[i];
break;
}
}
if (x < y)
return -1;
if (y < x)
return 1;
return 0;
};
Buffer.isEncoding = function isEncoding(encoding) {
switch (String(encoding).toLowerCase()) {
case 'hex':
case 'utf8':
case 'utf-8':
case 'ascii':
case 'latin1':
case 'binary':
case 'base64':
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return true;
default:
return false;
}
};
Buffer.concat = function concat(list, length) {
if (!Array.isArray(list)) {
throw new TypeError('"list" argument must be an Array of Buffers');
}
if (list.length === 0) {
return Buffer.alloc(0);
}
let i;
if (length === undefined) {
length = 0;
for (i = 0; i < list.length; ++i) {
length += list[i].length;
}
}
const buffer = Buffer.allocUnsafe(length);
let pos = 0;
for (i = 0; i < list.length; ++i) {
let buf = list[i];
if (isInstance(buf, Uint8Array)) {
if (pos + buf.length > buffer.length) {
if (!Buffer.isBuffer(buf))
buf = Buffer.from(buf);
buf.copy(buffer, pos);
}
else {
Uint8Array.prototype.set.call(buffer, buf, pos);
}
}
else if (!Buffer.isBuffer(buf)) {
throw new TypeError('"list" argument must be an Array of Buffers');
}
else {
buf.copy(buffer, pos);
}
pos += buf.length;
}
return buffer;
};
function byteLength(string, encoding) {
if (Buffer.isBuffer(string)) {
return string.length;
}
if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
return string.byteLength;
}
if (typeof string !== 'string') {
throw new TypeError('The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
'Received type ' +
typeof string);
}
const len = string.length;
const mustMatch = arguments.length > 2 && arguments[2] === true;
if (!mustMatch && len === 0)
return 0;
// Use a for loop to avoid recursion
let loweredCase = false;
for (;;) {
switch (encoding) {
case 'ascii':
case 'latin1':
case 'binary':
return len;
case 'utf8':
case 'utf-8':
return utf8ToBytes(string).length;
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return len * 2;
case 'hex':
return len >>> 1;
case 'base64':
return base64ToBytes(string).length;
default:
if (loweredCase) {
return mustMatch ? -1 : utf8ToBytes(string).length; // assume utf8
}
encoding = ('' + encoding).toLowerCase();
loweredCase = true;
}
}
}
Buffer.byteLength = byteLength;
function slowToString(encoding, start, end) {
let loweredCase = false;
// No need to verify that "this.length <= MAX_UINT32" since it's a read-only
// property of a typed array.
// This behaves neither like String nor Uint8Array in that we set start/end
// to their upper/lower bounds if the value passed is out of range.
// undefined is handled specially as per ECMA-262 6th Edition,
// Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
if (start === undefined || start < 0) {
start = 0;
}
// Return early if start > this.length. Done here to prevent potential uint32
// coercion fail below.
if (start > this.length) {
return '';
}
if (end === undefined || end > this.length) {
end = this.length;
}
if (end <= 0) {
return '';
}
// Force coercion to uint32. This will also coerce falsey/NaN values to 0.
end >>>= 0;
start >>>= 0;
if (end <= start) {
return '';
}
if (!encoding)
encoding = 'utf8';
while (true) {
switch (encoding) {
case 'hex':
return hexSlice(this, start, end);
case 'utf8':
case 'utf-8':
return utf8Slice(this, start, end);
case 'ascii':
return asciiSlice(this, start, end);
case 'latin1':
case 'binary':
return latin1Slice(this, start, end);
case 'base64':
return base64Slice(this, start, end);
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return utf16leSlice(this, start, end);
default:
if (loweredCase)
throw new TypeError('Unknown encoding: ' + encoding);
encoding = (encoding + '').toLowerCase();
loweredCase = true;
}
}
}
// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true;
function swap(b, n, m) {
const i = b[n];
b[n] = b[m];
b[m] = i;
}
Buffer.prototype.swap16 = function swap16() {
const len = this.length;
if (len % 2 !== 0) {
throw new RangeError('Buffer size must be a multiple of 16-bits');
}
for (let i = 0; i < len; i += 2) {
swap(this, i, i + 1);
}
return this;
};
Buffer.prototype.swap32 = function swap32() {
const len = this.length;
if (len % 4 !== 0) {
throw new RangeError('Buffer size must be a multiple of 32-bits');
}
for (let i = 0; i < len; i += 4) {
swap(this, i, i + 3);
swap(this, i + 1, i + 2);
}
return this;
};
Buffer.prototype.swap64 = function swap64() {
const len = this.length;
if (len % 8 !== 0) {
throw new RangeError('Buffer size must be a multiple of 64-bits');
}
for (let i = 0; i < len; i += 8) {
swap(this, i, i + 7);
swap(this, i + 1, i + 6);
swap(this, i + 2, i + 5);
swap(this, i + 3, i + 4);
}
return this;
};
Buffer.prototype.toString = function toString() {
const length = this.length;
if (length === 0)
return '';
if (arguments.length === 0)
return utf8Slice(this, 0, length);
return slowToString.apply(this, arguments);
};
Buffer.prototype.toLocaleString = Buffer.prototype.toString;
Buffer.prototype.equals = function equals(b) {
if (!Buffer.isBuffer(b))
throw new TypeError('Argument must be a Buffer');
if (this === b)
return true;
return Buffer.compare(this, b) === 0;
};
Buffer.prototype.inspect = function inspect() {
let str = '';
const max = exports.INSPECT_MAX_BYTES;
str = this.toString('hex', 0, max)
.replace(/(.{2})/g, '$1 ')
.trim();
if (this.length > max)
str += ' ... ';
return '<Buffer ' + str + '>';
};
if (customInspectSymbol) {
Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect;
}
Buffer.prototype.compare = function compare(target, start, end, thisStart, thisEnd) {
if (isInstance(target, Uint8Array)) {
target = Buffer.from(target, target.offset, target.byteLength);
}
if (!Buffer.isBuffer(target)) {
throw new TypeError('The "target" argument must be one of type Buffer or Uint8Array. ' +
'Received type ' +
typeof target);
}
if (start === undefined) {
start = 0;
}
if (end === undefined) {
end = target ? target.length : 0;
}
if (thisStart === undefined) {
thisStart = 0;
}
if (thisEnd === undefined) {
thisEnd = this.length;
}
if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
throw new RangeError('out of range index');
}
if (thisStart >= thisEnd && start >= end) {
return 0;
}
if (thisStart >= thisEnd) {
return -1;
}
if (start >= end) {
return 1;
}
start >>>= 0;
end >>>= 0;
thisStart >>>= 0;
thisEnd >>>= 0;
if (this === target)
return 0;
let x = thisEnd - thisStart;
let y = end - start;
const len = Math.min(x, y);
const thisCopy = this.slice(thisStart, thisEnd);
const targetCopy = target.slice(start, end);
for (let i = 0; i < len; ++i) {
if (thisCopy[i] !== targetCopy[i]) {
x = thisCopy[i];
y = targetCopy[i];
break;
}
}
if (x < y)
return -1;
if (y < x)
return 1;
return 0;
};
// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf(buffer, val, byteOffset, encoding, dir) {
// Empty buffer means no match
if (buffer.length === 0)
return -1;
// Normalize byteOffset
if (typeof byteOffset === 'string') {
encoding = byteOffset;
byteOffset = 0;
}
else if (byteOffset > 0x7fffffff) {
byteOffset = 0x7fffffff;
}
else if (byteOffset < -0x80000000) {
byteOffset = -0x80000000;
}
byteOffset = +byteOffset; // Coerce to Number.
if (numberIsNaN(byteOffset)) {
// byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
byteOffset = dir ? 0 : buffer.length - 1;
}
// Normalize byteOffset: negative offsets start from the end of the buffer
if (byteOffset < 0)
byteOffset = buffer.length + byteOffset;
if (byteOffset >= buffer.length) {
if (dir)
return -1;
else
byteOffset = buffer.length - 1;
}
else if (byteOffset < 0) {
if (dir)
byteOffset = 0;
else
return -1;
}
// Normalize val
if (typeof val === 'string') {
val = Buffer.from(val, encoding);
}
// Finally, search either indexOf (if dir is true) or lastIndexOf
if (Buffer.isBuffer(val)) {
// Special case: looking for empty string/buffer always fails
if (val.length === 0) {
return -1;
}
return arrayIndexOf(buffer, val, byteOffset, encoding, dir);
}
else if (typeof val === 'number') {
val = val & 0xff; // Search for a byte value [0-255]
if (typeof Uint8Array.prototype.indexOf === 'function') {
if (dir) {
return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset);
}
else {
return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset);
}
}
return arrayIndexOf(buffer, [val], byteOffset, encoding, dir);
}
throw new TypeError('val must be string, number or Buffer');
}
function arrayIndexOf(arr, val, byteOffset, encoding, dir) {
let indexSize = 1;
let arrLength = arr.length;
let valLength = val.length;
if (encoding !== undefined) {
encoding = String(encoding).toLowerCase();
if (encoding === 'ucs2' ||
encoding === 'ucs-2' ||
encoding === 'utf16le' ||
encoding === 'utf-16le') {
if (arr.length < 2 || val.length < 2) {
return -1;
}
indexSize = 2;
arrLength /= 2;
valLength /= 2;
byteOffset /= 2;
}
}
function read(buf, i) {
if (indexSize === 1) {
return buf[i];
}
else {
return buf.readUInt16BE(i * indexSize);
}
}
let i;
if (dir) {
let foundIndex = -1;
for (i = byteOffset; i < arrLength; i++) {
if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
if (foundIndex === -1)
foundIndex = i;
if (i - foundIndex + 1 === valLength)
return foundIndex * indexSize;
}
else {
if (foundIndex !== -1)
i -= i - foundIndex;
foundIndex = -1;
}
}
}
else {
if (byteOffset + valLength > arrLength)
byteOffset = arrLength - valLength;
for (i = byteOffset; i >= 0; i--) {
let found = true;
for (let j = 0; j < valLength; j++) {
if (read(arr, i + j) !== read(val, j)) {
found = false;
break;
}
}
if (found)
return i;
}
}
return -1;
}
Buffer.prototype.includes = function includes(val, byteOffset, encoding) {
return this.indexOf(val, byteOffset, encoding) !== -1;
};
Buffer.prototype.indexOf = function indexOf(val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, true);
};
Buffer.prototype.lastIndexOf = function lastIndexOf(val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, false);
};
function hexWrite(buf, string, offset, length) {
offset = Number(offset) || 0;
const remaining = buf.length - offset;
if (!length) {
length = remaining;
}
else {
length = Number(length);
if (length > remaining) {
length = remaining;
}
}
const strLen = string.length;
if (length > strLen / 2) {
length = strLen / 2;
}
let i;
for (i = 0; i < length; ++i) {
const parsed = parseInt(string.substr(i * 2, 2), 16);
if (numberIsNaN(parsed))
return i;
buf[offset + i] = parsed;
}
return i;
}
function utf8Write(buf, string, offset, length) {
return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length);
}
function asciiWrite(buf, string, offset, length) {
return blitBuffer(asciiToBytes(string), buf, offset, length);
}
function base64Write(buf, string, offset, length) {
return blitBuffer(base64ToBytes(string), buf, offset, length);
}
function ucs2Write(buf, string, offset, length) {
return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length);
}
Buffer.prototype.write = function write(string, offset, length, encoding) {
// Buffer#write(string)
if (offset === undefined) {
encoding = 'utf8';
length = this.length;
offset = 0;
// Buffer#write(string, encoding)
}
else if (length === undefined && typeof offset === 'string') {
encoding = offset;
length = this.length;
offset = 0;
// Buffer#write(string, offset[, length][, encoding])
}
else if (isFinite(offset)) {
offset = offset >>> 0;
if (isFinite(length)) {
length = length >>> 0;
if (encoding === undefined)
encoding = 'utf8';
}
else {
encoding = length;
length = undefined;
}
}
else {
throw new Error('Buffer.write(string, encoding, offset[, length]) is no longer supported');
}
const remaining = this.length - offset;
if (length === undefined || length > remaining)
length = remaining;
if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
throw new RangeError('Attempt to write outside buffer bounds');
}
if (!encoding)
encoding = 'utf8';
let loweredCase = false;
for (;;) {
switch (encoding) {
case 'hex':
return hexWrite(this, string, offset, length);
case 'utf8':
case 'utf-8':
return utf8Write(this, string, offset, length);
case 'ascii':
case 'latin1':
case 'binary':
return asciiWrite(this, string, offset, length);
case 'base64':
// Warning: maxLength not taken into account in base64Write
return base64Write(this, string, offset, length);
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return ucs2Write(this, string, offset, length);
default:
if (loweredCase)
throw new TypeError('Unknown encoding: ' + encoding);
encoding = ('' + encoding).toLowerCase();
loweredCase = true;
}
}
};
Buffer.prototype.toJSON = function toJSON() {
return {
type: 'Buffer',
data: Array.prototype.slice.call(this._arr || this, 0)
};
};
function base64Slice(buf, start, end) {
if (start === 0 && end === buf.length) {
return base64.fromByteArray(buf);
}
else {
return base64.fromByteArray(buf.slice(start, end));
}
}
function utf8Slice(buf, start, end) {
end = Math.min(buf.length, end);
const res = [];
let i = start;
while (i < end) {
const firstByte = buf[i];
let codePoint = null;
let bytesPerSequence = firstByte > 0xef ? 4 : firstByte > 0xdf ? 3 : firstByte > 0xbf ? 2 : 1;
if (i + bytesPerSequence <= end) {
let secondByte, thirdByte, fourthByte, tempCodePoint;
switch (bytesPerSequence) {
case 1:
if (firstByte < 0x80) {
codePoint = firstByte;
}
break;
case 2:
secondByte = buf[i + 1];
if ((secondByte & 0xc0) === 0x80) {
tempCodePoint = ((firstByte & 0x1f) << 0x6) | (secondByte & 0x3f);
if (tempCodePoint > 0x7f) {
codePoint = tempCodePoint;
}
}
break;
case 3:
secondByte = buf[i + 1];
thirdByte = buf[i + 2];
if ((secondByte & 0xc0) === 0x80 && (thirdByte & 0xc0) === 0x80) {
tempCodePoint =
((firstByte & 0xf) << 0xc) |
((secondByte & 0x3f) << 0x6) |
(thirdByte & 0x3f);
if (tempCodePoint > 0x7ff &&
(tempCodePoint < 0xd800 || tempCodePoint > 0xdfff)) {
codePoint = tempCodePoint;
}
}
break;
case 4:
secondByte = buf[i + 1];
thirdByte = buf[i + 2];
fourthByte = buf[i + 3];
if ((secondByte & 0xc0) === 0x80 &&
(thirdByte & 0xc0) === 0x80 &&
(fourthByte & 0xc0) === 0x80) {
tempCodePoint =
((firstByte & 0xf) << 0x12) |
((secondByte & 0x3f) << 0xc) |
((thirdByte & 0x3f) << 0x6) |
(fourthByte & 0x3f);
if (tempCodePoint > 0xffff && tempCodePoint < 0x110000) {
codePoint = tempCodePoint;
}
}
}
}
if (codePoint === null) {
// we did not generate a valid codePoint so insert a
// replacement char (U+FFFD) and advance only 1 byte
codePoint = 0xfffd;
bytesPerSequence = 1;
}
else if (codePoint > 0xffff) {
// encode to utf16 (surrogate pair dance)
codePoint -= 0x10000;
res.push(((codePoint >>> 10) & 0x3ff) | 0xd800);
codePoint = 0xdc00 | (codePoint & 0x3ff);
}
res.push(codePoint);
i += bytesPerSequence;
}
return decodeCodePointsArray(res);
}
// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
const MAX_ARGUMENTS_LENGTH = 0x1000;
function decodeCodePointsArray(codePoints) {
const len = codePoints.length;
if (len <= MAX_ARGUMENTS_LENGTH) {
return String.fromCharCode.apply(String, codePoints); // avoid extra slice()
}
// Decode in chunks to avoid "call stack size exceeded".
let res = '';
let i = 0;
while (i < len) {
res += String.fromCharCode.apply(String, codePoints.slice(i, (i += MAX_ARGUMENTS_LENGTH)));
}
return res;
}
function asciiSlice(buf, start, end) {
let ret = '';
end = Math.min(buf.length, end);
for (let i = start; i < end; ++i) {
ret += String.fromCharCode(buf[i] & 0x7f);
}
return ret;
}
function latin1Slice(buf, start, end) {
let ret = '';
end = Math.min(buf.length, end);
for (let i = start; i < end; ++i) {
ret += String.fromCharCode(buf[i]);
}
return ret;
}
function hexSlice(buf, start, end) {
const len = buf.length;
if (!start || start < 0)
start = 0;
if (!end || end < 0 || end > len)
end = len;
let out = '';
for (let i = start; i < end; ++i) {
out += hexSliceLookupTable[buf[i]];
}
return out;
}
function utf16leSlice(buf, start, end) {
const bytes = buf.slice(start, end);
let res = '';
// If bytes.length is odd, the last 8 bits must be ignored (same as node.js)
for (let i = 0; i < bytes.length - 1; i += 2) {
res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256);
}
return res;
}
Buffer.prototype.slice = function slice(start, end) {
const len = this.length;
start = ~~start;
end = end === undefined ? len : ~~end;
if (start < 0) {
start += len;
if (start < 0)
start = 0;
}
else if (start > len) {
start = len;
}
if (end < 0) {
end += len;
if (end < 0)
end = 0;
}
else if (end > len) {
end = len;
}
if (end < start)
end = start;
const newBuf = this.subarray(start, end);
// Return an augmented `Uint8Array` instance
Object.setPrototypeOf(newBuf, Buffer.prototype);
return newBuf;
};
/*
* Need to make sure that buffer isn't trying to write out of bounds.
*/
function checkOffset(offset, ext, length) {
if (offset % 1 !== 0 || offset < 0)
throw new RangeError('offset is not uint');
if (offset + ext > length)
throw new RangeError('Trying to access beyond buffer length');
}
Buffer.prototype.readUintLE = Buffer.prototype.readUIntLE = function readUIntLE(offset, byteLength, noAssert) {
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert)
checkOffset(offset, byteLength, this.length);
let val = this[offset];
let mul = 1;
let i = 0;
while (++i < byteLength && (mul *= 0x100)) {
val += this[offset + i] * mul;
}
return val;
};
Buffer.prototype.readUintBE = Buffer.prototype.readUIntBE = function readUIntBE(offset, byteLength, noAssert) {
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert) {
checkOffset(offset, byteLength, this.length);
}
let val = this[offset + --byteLength];
let mul = 1;
while (byteLength > 0 && (mul *= 0x100)) {
val += this[offset + --byteLength] * mul;
}
return val;
};
Buffer.prototype.readUint8 = Buffer.prototype.readUInt8 = function readUInt8(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 1, this.length);
return this[offset];
};
Buffer.prototype.readUint16LE = Buffer.prototype.readUInt16LE = function readUInt16LE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 2, this.length);
return this[offset] | (this[offset + 1] << 8);
};
Buffer.prototype.readUint16BE = Buffer.prototype.readUInt16BE = function readUInt16BE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 2, this.length);
return (this[offset] << 8) | this[offset + 1];
};
Buffer.prototype.readUint32LE = Buffer.prototype.readUInt32LE = function readUInt32LE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 4, this.length);
return ((this[offset] | (this[offset + 1] << 8) | (this[offset + 2] << 16)) +
this[offset + 3] * 0x1000000);
};
Buffer.prototype.readUint32BE = Buffer.prototype.readUInt32BE = function readUInt32BE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 4, this.length);
return (this[offset] * 0x1000000 +
((this[offset + 1] << 16) | (this[offset + 2] << 8) | this[offset + 3]));
};
Buffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE(offset) {
offset = offset >>> 0;
validateNumber(offset, 'offset');
const first = this[offset];
const last = this[offset + 7];
if (first === undefined || last === undefined) {
boundsError(offset, this.length - 8);
}
const lo = first + this[++offset] * 2 ** 8 + this[++offset] * 2 ** 16 + this[++offset] * 2 ** 24;
const hi = this[++offset] + this[++offset] * 2 ** 8 + this[++offset] * 2 ** 16 + last * 2 ** 24;
return BigInt(lo) + (BigInt(hi) << BigInt(32));
});
Buffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE(offset) {
offset = offset >>> 0;
validateNumber(offset, 'offset');
const first = this[offset];
const last = this[offset + 7];
if (first === undefined || last === undefined) {
boundsError(offset, this.length - 8);
}
const hi = first * 2 ** 24 + this[++offset] * 2 ** 16 + this[++offset] * 2 ** 8 + this[++offset];
const lo = this[++offset] * 2 ** 24 + this[++offset] * 2 ** 16 + this[++offset] * 2 ** 8 + last;
return (BigInt(hi) << BigInt(32)) + BigInt(lo);
});
Buffer.prototype.readIntLE = function readIntLE(offset, byteLength, noAssert) {
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert)
checkOffset(offset, byteLength, this.length);
let val = this[offset];
let mul = 1;
let i = 0;
while (++i < byteLength && (mul *= 0x100)) {
val += this[offset + i] * mul;
}
mul *= 0x80;
if (val >= mul)
val -= Math.pow(2, 8 * byteLength);
return val;
};
Buffer.prototype.readIntBE = function readIntBE(offset, byteLength, noAssert) {
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert)
checkOffset(offset, byteLength, this.length);
let i = byteLength;
let mul = 1;
let val = this[offset + --i];
while (i > 0 && (mul *= 0x100)) {
val += this[offset + --i] * mul;
}
mul *= 0x80;
if (val >= mul)
val -= Math.pow(2, 8 * byteLength);
return val;
};
Buffer.prototype.readInt8 = function readInt8(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 1, this.length);
if (!(this[offset] & 0x80))
return this[offset];
return (0xff - this[offset] + 1) * -1;
};
Buffer.prototype.readInt16LE = function readInt16LE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 2, this.length);
const val = this[offset] | (this[offset + 1] << 8);
return val & 0x8000 ? val | 0xffff0000 : val;
};
Buffer.prototype.readInt16BE = function readInt16BE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 2, this.length);
const val = this[offset + 1] | (this[offset] << 8);
return val & 0x8000 ? val | 0xffff0000 : val;
};
Buffer.prototype.readInt32LE = function readInt32LE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 4, this.length);
return (this[offset] | (this[offset + 1] << 8) | (this[offset + 2] << 16) | (this[offset + 3] << 24));
};
Buffer.prototype.readInt32BE = function readInt32BE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 4, this.length);
return ((this[offset] << 24) | (this[offset + 1] << 16) | (this[offset + 2] << 8) | this[offset + 3]);
};
Buffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE(offset) {
offset = offset >>> 0;
validateNumber(offset, 'offset');
const first = this[offset];
const last = this[offset + 7];
if (first === undefined || last === undefined) {
boundsError(offset, this.length - 8);
}
const val = this[offset + 4] + this[offset + 5] * 2 ** 8 + this[offset + 6] * 2 ** 16 + (last << 24); // Overflow
return ((BigInt(val) << BigInt(32)) +
BigInt(first + this[++offset] * 2 ** 8 + this[++offset] * 2 ** 16 + this[++offset] * 2 ** 24));
});
Buffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE(offset) {
offset = offset >>> 0;
validateNumber(offset, 'offset');
const first = this[offset];
const last = this[offset + 7];
if (first === undefined || last === undefined) {
boundsError(offset, this.length - 8);
}
const val = (first << 24) + // Overflow
this[++offset] * 2 ** 16 +
this[++offset] * 2 ** 8 +
this[++offset];
return ((BigInt(val) << BigInt(32)) +
BigInt(this[++offset] * 2 ** 24 + this[++offset] * 2 ** 16 + this[++offset] * 2 ** 8 + last));
});
Buffer.prototype.readFloatLE = function readFloatLE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 4, this.length);
return ieee754.read(this, offset, true, 23, 4);
};
Buffer.prototype.readFloatBE = function readFloatBE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 4, this.length);
return ieee754.read(this, offset, false, 23, 4);
};
Buffer.prototype.readDoubleLE = function readDoubleLE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 8, this.length);
return ieee754.read(this, offset, true, 52, 8);
};
Buffer.prototype.readDoubleBE = function readDoubleBE(offset, noAssert) {
offset = offset >>> 0;
if (!noAssert)
checkOffset(offset, 8, this.length);
return ieee754.read(this, offset, false, 52, 8);
};
function checkInt(buf, value, offset, ext, max, min) {
if (!Buffer.isBuffer(buf))
throw new TypeError('"buffer" argument must be a Buffer instance');
if (value > max || value < min)
throw new RangeError('"value" argument is out of bounds');
if (offset + ext > buf.length)
throw new RangeError('Index out of range');
}
Buffer.prototype.writeUintLE = Buffer.prototype.writeUIntLE = function writeUIntLE(value, offset, byteLength, noAssert) {
value = +value;
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert) {
const maxBytes = Math.pow(2, 8 * byteLength) - 1;
checkInt(this, value, offset, byteLength, maxBytes, 0);
}
let mul = 1;
let i = 0;
this[offset] = value & 0xff;
while (++i < byteLength && (mul *= 0x100)) {
this[offset + i] = (value / mul) & 0xff;
}
return offset + byteLength;
};
Buffer.prototype.writeUintBE = Buffer.prototype.writeUIntBE = function writeUIntBE(value, offset, byteLength, noAssert) {
value = +value;
offset = offset >>> 0;
byteLength = byteLength >>> 0;
if (!noAssert) {
const maxBytes = Math.pow(2, 8 * byteLength) - 1;
checkInt(this, value, offset, byteLength, maxBytes, 0);
}
let i = byteLength - 1;
let mul = 1;
this[offset + i] = value & 0xff;
while (--i >= 0 && (mul *= 0x100)) {
this[offset + i] = (value / mul) & 0xff;
}
return offset + byteLength;
};
Buffer.prototype.writeUint8 = Buffer.prototype.writeUInt8 = function writeUInt8(value, offset, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert)
checkInt(this, value, offset, 1, 0xff, 0);
this[offset] = value & 0xff;
return offset + 1;
};
Buffer.prototype.writeUint16LE = Buffer.prototype.writeUInt16LE = function writeUInt16LE(value, offset, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert)
checkInt(this, value, offset, 2, 0xffff, 0);
this[offset] = value & 0xff;
this[offset + 1] = value >>> 8;
return offset + 2;
};
Buffer.prototype.writeUint16BE = Buffer.prototype.writeUInt16BE = function writeUInt16BE(value, offset, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert)
checkInt(this, value, offset, 2, 0xffff, 0);
this[offset] = value >>> 8;
this[offset + 1] = value & 0xff;
return offset + 2;
};
Buffer.prototype.writeUint32LE = Buffer.prototype.writeUInt32LE = function writeUInt32LE(value, offset, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert)
checkInt(this, value, offset, 4, 0xffffffff, 0);
this[offset + 3] = value >>> 24;
this[offset + 2] = value >>> 16;
this[offset + 1] = value >>> 8;
this[offset] = value & 0xff;
return offset + 4;
};
Buffer.prototype.writeUint32BE = Buffer.prototype.writeUInt32BE = function writeUInt32BE(value, offset, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert)
checkInt(this, value, offset, 4, 0xffffffff, 0);
this[offset] = value >>> 24;
this[offset + 1] = value >>> 16;
this[offset + 2] = value >>> 8;
this[offset + 3] = value & 0xff;
return offset + 4;
};
function wrtBigUInt64LE(buf, value, offset, min, max) {
checkIntBI(value, min, max, buf, offset, 7);
let lo = Number(value & BigInt(0xffffffff));
buf[offset++] = lo;
lo = lo >> 8;
buf[offset++] = lo;
lo = lo >> 8;
buf[offset++] = lo;
lo = lo >> 8;
buf[offset++] = lo;
let hi = Number((value >> BigInt(32)) & BigInt(0xffffffff));
buf[offset++] = hi;
hi = hi >> 8;
buf[offset++] = hi;
hi = hi >> 8;
buf[offset++] = hi;
hi = hi >> 8;
buf[offset++] = hi;
return offset;
}
function wrtBigUInt64BE(buf, value, offset, min, max) {
checkIntBI(value, min, max, buf, offset, 7);
let lo = Number(value & BigInt(0xffffffff));
buf[offset + 7] = lo;
lo = lo >> 8;
buf[offset + 6] = lo;
lo = lo >> 8;
buf[offset + 5] = lo;
lo = lo >> 8;
buf[offset + 4] = lo;
let hi = Number((value >> BigInt(32)) & BigInt(0xffffffff));
buf[offset + 3] = hi;
hi = hi >> 8;
buf[offset + 2] = hi;
hi = hi >> 8;
buf[offset + 1] = hi;
hi = hi >> 8;
buf[offset] = hi;
return offset + 8;
}
Buffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE(value, offset = 0) {
return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'));
});
Buffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE(value, offset = 0) {
return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'));
});
Buffer.prototype.writeIntLE = function writeIntLE(value, offset, byteLength, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert) {
const limit = Math.pow(2, 8 * byteLength - 1);
checkInt(this, value, offset, byteLength, limit - 1, -limit);
}
let i = 0;
let mul = 1;
let sub = 0;
this[offset] = value & 0xff;
while (++i < byteLength && (mul *= 0x100)) {
if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
sub = 1;
}
this[offset + i] = (((value / mul) >> 0) - sub) & 0xff;
}
return offset + byteLength;
};
Buffer.prototype.writeIntBE = function writeIntBE(value, offset, byteLength, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert) {
const limit = Math.pow(2, 8 * byteLength - 1);
checkInt(this, value, offset, byteLength, limit - 1, -limit);
}
let i = byteLength - 1;
let mul = 1;
let sub = 0;
this[offset + i] = value & 0xff;
while (--i >= 0 && (mul *= 0x100)) {
if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
sub = 1;
}
this[offset + i] = (((value / mul) >> 0) - sub) & 0xff;
}
return offset + byteLength;
};
Buffer.prototype.writeInt8 = function writeInt8(value, offset, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert)
checkInt(this, value, offset, 1, 0x7f, -0x80);
if (value < 0)
value = 0xff + value + 1;
this[offset] = value & 0xff;
return offset + 1;
};
Buffer.prototype.writeInt16LE = function writeInt16LE(value, offset, noAssert) {
value = +value;
offset = offset >>> 0;
if (!noAssert)
checkInt(this, value, offset, 2,