bun.sh/src/node-fallbacks/buffer.js

/*
 * The buffer module from node.js, for the browser.
 *
 * Modified to an ES module for usage in Bun. Additional changes were made to
 * add many pure annotations, and support newer node features, such as
 * re-exporting Blob and file.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */

"use strict";

import * as base64 from "./vendor/base64-js.js";
import * as ieee754 from "./vendor/ieee754.js";

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;

export const INSPECT_MAX_BYTES = 50;

export const kMaxLength = 0x7fffffff;
export const kStringMaxLength = 0x1fffffe8;

export const btoa = /* @__PURE__ */ globalThis.btoa;
export const atob = /* @__PURE__ */ globalThis.atob;
export const File = /* @__PURE__ */ globalThis.File;
export const Blob = /* @__PURE__ */ globalThis.Blob;

export const constants = { MAX_LENGTH: kMaxLength, MAX_STRING_LENGTH: kStringMaxLength };

function createBuffer(length) {
  if (length > kMaxLength) {
    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;
}

// CUSTOM ERRORS
// =============

// Simplified versions from Node, changed for Buffer-only usage
function E(sym, getMessage, Base) {
  return class NodeError extends Base {
    constructor() {
      super();

      Object.defineProperty(this, "message", {
        value: getMessage.apply(this, arguments),
        writable: true,
        configurable: true,
      });

      // Add the error code to the name to include it in the stack trace.
      this.name = `${this.name} [${sym}]`;
      // Access the stack to generate the error message including the error code
      // from the name.
      this.stack; // eslint-disable-line no-unused-expressions
      // Reset the name to the actual name.
      delete this.name;
    }

    get code() {
      return sym;
    }

    set code(value) {
      Object.defineProperty(this, "code", {
        configurable: true,
        enumerable: true,
        value,
        writable: true,
      });
    }

    toString() {
      return `${this.name} [${sym}]: ${this.message}`;
    }
  };
}

const ERR_BUFFER_OUT_OF_BOUNDS = /* @__PURE__ */ E(
  "ERR_BUFFER_OUT_OF_BOUNDS",
  function (name) {
    if (name) {
      return `${name} is outside of buffer bounds`;
    }

    return "Attempt to access memory outside buffer bounds";
  },
  RangeError,
);

const ERR_INVALID_ARG_TYPE = /* @__PURE__ */ E(
  "ERR_INVALID_ARG_TYPE",
  function (name, actual) {
    return `The "${name}" argument must be of type number. Received type ${typeof actual}`;
  },
  TypeError,
);

const ERR_OUT_OF_RANGE = /* @__PURE__ */ E(
  "ERR_OUT_OF_RANGE",
  function (str, range, input) {
    let msg = `The value of "${str}" is out of range.`;
    let received = input;
    if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {
      received = addNumericalSeparator(String(input));
    } else if (typeof input === "bigint") {
      received = String(input);
      if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {
        received = addNumericalSeparator(received);
      }
      received += "n";
    }
    msg += ` It must be ${range}. Received ${received}`;
    return msg;
  },
  RangeError,
);

/**
 * 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.
 */
export 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);
}

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;
  },
});

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 >= kMaxLength) {
    throw new RangeError(
      "Attempt to allocate Buffer larger than maximum " + "size: 0x" + kMaxLength.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 (Number.isNaN(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 = /* @__PURE */ 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 = /* @__PURE */ 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 = /* @__PURE */ 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 = /* @__PURE */ 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 = /* @__PURE */ defineBigIntMethod(function writeBigUInt64LE(value, offset = 0) {
  return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt("0xffffffffffffffff"));
});

Buffer.prototype.writeBigUInt64BE = /* @__PURE */ 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, 0x7fff, -0x8000);
  this[offset] = value & 0xff;
  this[offset + 1] = value >>> 8;
  return offset + 2;
};

Buffer.prototype.writeInt16BE = function writeInt16BE(value, offset, noAssert) {
  value = +value;
  offset = offset >>> 0;
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000);
  this[offset] = value >>> 8;
  this[offset + 1] = value & 0xff;
  return offset + 2;
};

Buffer.prototype.writeInt32LE = function writeInt32LE(value, offset, noAssert) {
  value = +value;
  offset = offset >>> 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
  this[offset] = value & 0xff;
  this[offset + 1] = value >>> 8;
  this[offset + 2] = value >>> 16;
  this[offset + 3] = value >>> 24;
  return offset + 4;
};

Buffer.prototype.writeInt32BE = function writeInt32BE(value, offset, noAssert) {
  value = +value;
  offset = offset >>> 0;
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
  if (value < 0) value = 0xffffffff + value + 1;
  this[offset] = value >>> 24;
  this[offset + 1] = value >>> 16;
  this[offset + 2] = value >>> 8;
  this[offset + 3] = value & 0xff;
  return offset + 4;
};

Buffer.prototype.writeBigInt64LE = /* @__PURE */ defineBigIntMethod(function writeBigInt64LE(value, offset = 0) {
  return wrtBigUInt64LE(this, value, offset, -BigInt("0x8000000000000000"), BigInt("0x7fffffffffffffff"));
});

Buffer.prototype.writeBigInt64BE = /* @__PURE */ defineBigIntMethod(function writeBigInt64BE(value, offset = 0) {
  return wrtBigUInt64BE(this, value, offset, -BigInt("0x8000000000000000"), BigInt("0x7fffffffffffffff"));
});

function checkIEEE754(buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError("Index out of range");
  if (offset < 0) throw new RangeError("Index out of range");
}

function writeFloat(buf, value, offset, littleEndian, noAssert) {
  value = +value;
  offset = offset >>> 0;
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e38, -3.4028234663852886e38);
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4);
  return offset + 4;
}

Buffer.prototype.writeFloatLE = function writeFloatLE(value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert);
};

Buffer.prototype.writeFloatBE = function writeFloatBE(value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert);
};

function writeDouble(buf, value, offset, littleEndian, noAssert) {
  value = +value;
  offset = offset >>> 0;
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157e308, -1.7976931348623157e308);
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8);
  return offset + 8;
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE(value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert);
};

Buffer.prototype.writeDoubleBE = function writeDoubleBE(value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert);
};

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy(target, targetStart, start, end) {
  if (!Buffer.isBuffer(target)) throw new TypeError("argument should be a Buffer");
  if (!start) start = 0;
  if (!end && end !== 0) end = this.length;
  if (targetStart >= target.length) targetStart = target.length;
  if (!targetStart) targetStart = 0;
  if (end > 0 && end < start) end = start;

  // Copy 0 bytes; we're done
  if (end === start) return 0;
  if (target.length === 0 || this.length === 0) return 0;

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError("targetStart out of bounds");
  }
  if (start < 0 || start >= this.length) throw new RangeError("Index out of range");
  if (end < 0) throw new RangeError("sourceEnd out of bounds");

  // Are we oob?
  if (end > this.length) end = this.length;
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start;
  }

  const len = end - start;

  if (this === target && typeof Uint8Array.prototype.copyWithin === "function") {
    // Use built-in when available, missing from IE11
    this.copyWithin(targetStart, start, end);
  } else {
    Uint8Array.prototype.set.call(target, this.subarray(start, end), targetStart);
  }

  return len;
};

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill(val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === "string") {
    if (typeof start === "string") {
      encoding = start;
      start = 0;
      end = this.length;
    } else if (typeof end === "string") {
      encoding = end;
      end = this.length;
    }
    if (encoding !== undefined && typeof encoding !== "string") {
      throw new TypeError("encoding must be a string");
    }
    if (typeof encoding === "string" && !Buffer.isEncoding(encoding)) {
      throw new TypeError("Unknown encoding: " + encoding);
    }
    if (val.length === 1) {
      const code = val.charCodeAt(0);
      if ((encoding === "utf8" && code < 128) || encoding === "latin1") {
        // Fast path: If `val` fits into a single byte, use that numeric value.
        val = code;
      }
    }
  } else if (typeof val === "number") {
    val = val & 255;
  } else if (typeof val === "boolean") {
    val = Number(val);
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError("Out of range index");
  }

  if (end <= start) {
    return this;
  }

  start = start >>> 0;
  end = end === undefined ? this.length : end >>> 0;

  if (!val) val = 0;

  let i;
  if (typeof val === "number") {
    for (i = start; i < end; ++i) {
      this[i] = val;
    }
  } else {
    const bytes = Buffer.isBuffer(val) ? val : Buffer.from(val, encoding);
    const len = bytes.length;
    if (len === 0) {
      throw new TypeError('The value "' + val + '" is invalid for argument "value"');
    }
    for (i = 0; i < end - start; ++i) {
      this[i + start] = bytes[i % len];
    }
  }

  return this;
};

function addNumericalSeparator(val) {
  let res = "";
  let i = val.length;
  const start = val[0] === "-" ? 1 : 0;
  for (; i >= start + 4; i -= 3) {
    res = `_${val.slice(i - 3, i)}${res}`;
  }
  return `${val.slice(0, i)}${res}`;
}

// CHECK FUNCTIONS
// ===============

function checkBounds(buf, offset, byteLength) {
  validateNumber(offset, "offset");
  if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {
    boundsError(offset, buf.length - (byteLength + 1));
  }
}

function checkIntBI(value, min, max, buf, offset, byteLength) {
  if (value > max || value < min) {
    const n = typeof min === "bigint" ? "n" : "";
    let range;
    if (byteLength > 3) {
      if (min === 0 || min === BigInt(0)) {
        range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`;
      } else {
        range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` + `${(byteLength + 1) * 8 - 1}${n}`;
      }
    } else {
      range = `>= ${min}${n} and <= ${max}${n}`;
    }
    throw new ERR_OUT_OF_RANGE("value", range, value);
  }
  checkBounds(buf, offset, byteLength);
}

function validateNumber(value, name) {
  if (typeof value !== "number") {
    throw new ERR_INVALID_ARG_TYPE(name, "number", value);
  }
}

function boundsError(value, length, type) {
  if (Math.floor(value) !== value) {
    validateNumber(value, type);
    throw new ERR_OUT_OF_RANGE(type || "offset", "an integer", value);
  }

  if (length < 0) {
    throw new ERR_BUFFER_OUT_OF_BOUNDS();
  }

  throw new ERR_OUT_OF_RANGE(type || "offset", `>= ${type ? 1 : 0} and <= ${length}`, value);
}

// HELPER FUNCTIONS
// ================

const INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g;

function base64clean(str) {
  // Node takes equal signs as end of the Base64 encoding
  str = str.split("=")[0];
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = str.trim().replace(INVALID_BASE64_RE, "");
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return "";
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + "=";
  }
  return str;
}

function utf8ToBytes(string, units) {
  units = units || Infinity;
  let codePoint;
  const length = string.length;
  let leadSurrogate = null;
  const bytes = [];

  for (let i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i);

    // is surrogate component
    if (codePoint > 0xd7ff && codePoint < 0xe000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xdbff) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xef, 0xbf, 0xbd);
          continue;
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xef, 0xbf, 0xbd);
          continue;
        }

        // valid lead
        leadSurrogate = codePoint;

        continue;
      }

      // 2 leads in a row
      if (codePoint < 0xdc00) {
        if ((units -= 3) > -1) bytes.push(0xef, 0xbf, 0xbd);
        leadSurrogate = codePoint;
        continue;
      }

      // valid surrogate pair
      codePoint = (((leadSurrogate - 0xd800) << 10) | (codePoint - 0xdc00)) + 0x10000;
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xef, 0xbf, 0xbd);
    }

    leadSurrogate = null;

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break;
      bytes.push(codePoint);
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break;
      bytes.push((codePoint >> 0x6) | 0xc0, (codePoint & 0x3f) | 0x80);
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break;
      bytes.push((codePoint >> 0xc) | 0xe0, ((codePoint >> 0x6) & 0x3f) | 0x80, (codePoint & 0x3f) | 0x80);
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break;
      bytes.push(
        (codePoint >> 0x12) | 0xf0,
        ((codePoint >> 0xc) & 0x3f) | 0x80,
        ((codePoint >> 0x6) & 0x3f) | 0x80,
        (codePoint & 0x3f) | 0x80,
      );
    } else {
      throw new Error("Invalid code point");
    }
  }

  return bytes;
}

function asciiToBytes(str) {
  const byteArray = [];
  for (let i = 0; i < str.length; ++i) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xff);
  }
  return byteArray;
}

function utf16leToBytes(str, units) {
  let c, hi, lo;
  const byteArray = [];
  for (let i = 0; i < str.length; ++i) {
    if ((units -= 2) < 0) break;

    c = str.charCodeAt(i);
    hi = c >> 8;
    lo = c % 256;
    byteArray.push(lo);
    byteArray.push(hi);
  }

  return byteArray;
}

function base64ToBytes(str) {
  return base64.toByteArray(base64clean(str));
}

function blitBuffer(src, dst, offset, length) {
  let i;
  for (i = 0; i < length; ++i) {
    if (i + offset >= dst.length || i >= src.length) break;
    dst[i + offset] = src[i];
  }
  return i;
}

// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance(obj, type) {
  return (
    obj instanceof type ||
    (obj != null && obj.constructor != null && obj.constructor.name != null && obj.constructor.name === type.name)
  );
}

// Create lookup table for `toString('hex')`
// See: https://github.com/feross/buffer/issues/219
const hexSliceLookupTable = (function () {
  const alphabet = "0123456789abcdef";
  const table = new Array(256);
  for (let i = 0; i < 16; ++i) {
    const i16 = i * 16;
    for (let j = 0; j < 16; ++j) {
      table[i16 + j] = alphabet[i] + alphabet[j];
    }
  }
  return table;
})();

// Return not function with Error if BigInt not supported
function defineBigIntMethod(fn) {
  return typeof BigInt === "undefined" ? BufferBigIntNotDefined : fn;
}

function BufferBigIntNotDefined() {
  throw new Error("BigInt not supported");
}

function notimpl(name) {
  return () => {
    throw new Error(name + " is not implemented for node:buffer browser polyfill");
  };
}

export let resolveObjectURL = notimpl("resolveObjectURL");
export let isUtf8 = notimpl("isUtf8");
export let isAscii = str => {
  for (let char of str) {
    if (char.charCodeAt(0) > 127) {
      return false;
    }
  }
  return true;
};
export let transcode = notimpl("transcode");
export default Buffer;